SEMS-RM DOCID # 100016970

www.haleyaldrich.com ~ ~ ICH

FIFTH FIVE‐YEAR REVIEW REPORT FORMER 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

by Haley & Aldrich, Inc. Oakland, California

for Advanced Micro Devices, Inc. Austin, Texas

File No. 127839‐004 January 2019

Haley & Aldrich, Inc. 1956 Webster Street Suite 300 ~ ~ ICH Oakland, CA 94612 510.879.4544

29 January 2019 File No. 127839‐004

California Regional Water Quality Control Board San Francisco Bay Region 1515 Clay Street, Suite 1400 Oakland, California 94612

Attention: Mr. Ron Goloubow, P.G.

Subject: Fifth Five‐Year Review Report Former 915 DeGuigne Drive Sunnyvale, California

Dear Mr. Goloubow:

Please find enclosed the Fifth Five‐Year Review Report prepared by Haley & Aldrich, Inc. on behalf of Advanced Micro Devices, Inc. (AMD) for the former AMD facility located at 915 DeGuigne Drive in Sunnyvale, California. This five‐year report has been prepared to address a requirement of the Site Cleanup Order (91‐101) issued by the California Regional Water Quality Control Board – San Francisco Bay Region.

Please feel free to call the undersigned if you have questions regarding this report.

Sincerely yours, HALEY & ALDRICH, INC

Michael Calhoun, P.G., C.H.G. Peter Bennett, P.G., C.H.G. Senior Project Manager Principal Hydrogeologist CA P.G. #8525, CA C.H.G. #976 CA P.G. #7902, CA C.H.G. #921 c: Advanced Micro Devices, Inc.; Attn: Ms. Heather O’Cleirigh City of Sunnyvale; Attn: Mr. Ron Staricha Santa Clara Valley Water District; Attn: Mr. George Cook United States Environmental Protection Agency; Attn: Ms. Melanie Morash

www.haleyaldrich.com Table of Contents Page

List of Tables iii List of Figures iii List of Acronyms and Abbreviations iv

1. Introduction 1

1.1 REGULATORY ORDERS 1 1.2 PURPOSE OF THIS REPORT 1 1.3 ISSUES RAISED IN THE 2014 EPA 5‐YEAR REVIEW 2

2. Site Background 4

2.1 SITE HISTORY AND CHEMICAL USE 4 2.2 NEARBY OFF‐SITE VOC RELEASE SITES 5 2.3 HYDROGEOLOGIC CONDITIONS 5 2.4 DISTRIBUTION OF COCS IN GROUNDWATER 6 2.5 GROUNDWATER EXTRACTION AND TREATMENT 7

3. Progress Since Last Review 8

3.1 GROUNDWATER MONITORING PROGRAM 8 3.2 GROUNDWATER EXTRACTION AND TREATMENT SYSTEM 8 3.3 CONFIRMATION GROUNDWATER SAMPLING WITHIN FORMER PAD C EXCAVATION AREA 9 3.4 VAPOR INTRUSION EVALUATION 9 3.5 WORK COMPLETED BY OTHERS 10 3.5.1 Soil Excavation in the Former Pad IV Area and Northern Basement Edge 10 3.5.2 Soil Excavation Near Former PG&E Substation 11 3.5.3 Organochlorine Pesticide Soil Excavation 12 3.5.4 GETS Relocation and Well Replacement Activities 12 3.5.5 Vapor Intrusion Mitigation 13

4. Remedial System Performance and Effectiveness 14

4.1 REMEDIAL OBJECTIVES 14 4.2 SOIL 14 4.3 GROUNDWATER 15 4.3.1 Evaluation of Hydraulic Containment 15 4.3.2 Concentration Trends 16 4.3.3 Concentrations in the PAD C Excavation Area 18 4.3.4 Extraction Mass Removal and Efficiency 18 4.4 VAPOR INTRUSION 19 4.5 INSTITUTIONAL CONTROLS 19 4.6 COST EVALUATION 19

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5. Conclusions and Recommendations 21

6. References 23

TABLES FIGURES APPENDIX A – Historical Water Level Data APPENDIX B – Historical TCE, cDCE, and Total VOC Concentrations APPENDIX C – Concentrations Trends from 2014 Five‐Year Review Report APPENDIX D – Title Search and Deed Restriction

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List of Tables

Table No. Title

1 Site Chronology

2 Summary of Groundwater Monitoring Data, 2014 through 2018

3 Status of Chemicals Removed Through 2018

4 Groundwater Extraction and Treatment System Efficiency and Cost Analysis

List of Figures

Figure No. Title

1 Site Location Map

2 Site Plan and Vicinity

3 Former Pad C Area Excavation

4 A‐Zone Water Levels, October 2018

5 B1‐Zone Water Levels, October 2018

6 B2‐Zone Water Levels, October 2018

7 Concentration Trends for A‐Zone Monitoring Wells

8 Concentration Trends for B1‐Zone Monitoring Wells

9 Concentration Trends for B2‐Zone Monitoring Wells

10 Mass Removal Efficiency, 1997 – 2018

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List of Acronyms and Abbreviations

Acronym Description

5YR Five‐Year Review AMD Advanced Micro Devices, Inc. AMEC AMEC Geomatrix, Inc. ANS acid neutralization system bgs below ground surface cDCE cis‐1,2‐dichloroethene COCs chemicals of concern EPA United States Environmental Protection Agency EPA 5‐Year Review EPA’s Five‐Year Review Report ES Engineering Science ESL Environmental Screening Level FFS Focused Feasibility Study GAC granular activated carbon Geomatrix Geomatrix Consultants, Inc. GETS groundwater extraction and treatment system gpm gallons per minute Haley & Aldrich Haley & Aldrich, Inc. HVAC heating, ventilation, and air conditioning LandSea LS‐Sunnyvale, LLC MCL Maximum Contaminant Level MDL laboratory method detection limit NPDES National Pollutant Discharge Elimination System OOU Companies’ Offsite Operable Unit PG&E Pacific Gas and Electric Company Philips Philips Semiconductors RL laboratory reporting limit ROD Record of Decision Site Former AMD Facility Located at 915 DeGuigne Drive SMP Soil Management Plan Stantec Stantec Consulting Services, Inc.

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Taylor Morrison Taylor Morrison of California, LLC TCE trichloroethene TPHd total petroleum hydrocarbons in the diesel range the Order Site Cleanup Requirements Order Number 91‐101 TRW Former TRW Microwave USTs underground vaulted and un‐vaulted storage tanks VIM system vapor intrusion mitigation system VISL Vapor Intrusion Screening Level VMP Vapor Mitigation Plan VOCs volatile organic compounds Water Board California Regional Water Quality Control Board, San Francisco Bay Region Watt Watt Investments at Sunnyvale, LLC µg/L micrograms per liter

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1. Introduction

On behalf of Advanced Micro Devices, Inc. (AMD), Haley & Aldrich, Inc. (Haley & Aldrich) has prepared this Fifth Five‐Year Review (5YR) Report for the former AMD facility located at 915 DeGuigne Drive, in Sunnyvale, California (the Site; Figure 1). This 5YR Report, covering the reporting period of 2014 through 2018, is submitted in response to Task 7 of Site Cleanup Requirements Order No. 91‐101 (the Order) issued by the California Regional Water Quality Control Board, San Francisco Bay Region (Water Board). The four previous 5YR Reports for the Site were submitted to the Water Board on behalf of AMD in June 1996, June 2001, December 2008, and January 2014. The Water Board, on behalf of the United States Environmental Protection Agency (EPA), Region 9, submitted its previous 5YR for the Site in September 2014 (EPA 5YR; EPA, 2014) based on AMD’s Fourth Five‐Year Review Report, submitted in 2014 (Haley & Aldrich, 2014a).

1.1 REGULATORY ORDERS

The Site was added to the National Priorities List in September 1990, and a Record of Decision (ROD) was issued by the EPA in August 1991 (EPA, 1991). The Site is currently regulated under the Order issued in June 1991 by the Water Board (Water Board, 1991). The Water Board is the lead regulatory oversight agency for the Site pursuant to the South Bay Multi‐Site Cooperative Agreement and the South Bay Groundwater Contamination Enforcement Agreement, established on 2 May 1985 by the Water Board, the Department of Health Services, and the EPA.

The Order documents the cleanup goals for Site groundwater and designates groundwater extraction and treatment as the final remedy for the Site. During this 5YR period, treated groundwater was discharged to an on‐Site storm drain under Water Board Order No. R2‐2012‐0012 and National Pollutant Discharge Elimination System (NPDES) Permit No. CAG912002. A new Water Board Order No. R2‐2017‐ 0048 replaced Order No. R2‐2012‐0012 and became effective on 1 January 2019.

1.2 PURPOSE OF THIS REPORT

The purpose of the 5YR is to determine whether the remedy at the Site is, and will continue to be, protective of human health and the environment (EPA, 2014). This Fifth 5YR Report assesses the effectiveness and efficiency of the ongoing remediation program over the past 5 years, and addresses issues raised in the previous EPA 5YR.

This report is organized into five sections, as described below:

 Section 1 – Introduction;  Section 2 – Site Background: this section includes a Site description and history and summarizes the Site’s hydrogeology and current environmental conditions, distribution of chemicals of concern (COCs) in groundwater, and current remedial alternative;  Section 3 – Progress Since Last Review: this section describes the groundwater monitoring program, groundwater extraction and treatment system (GETS), vapor intrusion evaluation, and work performed by others;

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 Section 4 – Remedial System Performance and Effectiveness: this section summarizes remedial objectives, evaluates the conditions of Site soil and groundwater, and summarizes a vapor intrusion evaluation, institutional controls, and Site cleanup costs;  Section 5 – Conclusions and Recommendation: this section summarizes the findings from the 5YR and provides recommendations for remedial activities for the next 5‐year period.

1.3 ISSUES RAISED IN THE 2014 EPA 5‐YEAR REVIEW

The three issues and recommended follow‐up actions were presented in the 2014 EPA 5YR:

Issue #1: The groundwater extraction and treatment system may not be able to restore the groundwater to its beneficial use as a potential source of drinking water due to VOCs from upgradient (off‐site) sites migrating onto the AMD 915 Site.

Recommendation and Follow‐up Action: Establish a broader strategy for groundwater restoration for the AMD 915 upgradient sites.

Issue #2: California Civil Code section 1471 has changed since the restrictive covenant was recorded.

Recommendation and Follow‐up Action: A new restrictive covenant that complies with California Civil Code section 1471 should be recorded.

Issue #3: A State MCL [Maximum Contaminant Level] for hexavalent chromium has recently been established and the MCLs for chloroform, ethylbenzene and 1,2,4‐trichlorobenzene has changed.

Recommendation and Follow‐up Action: An Explanation of Significant Differences should be issued to set new cleanup goals for the chemicals considering the new MCLs.

AMD has implemented the recommended Follow‐Up Actions described above, to the extent they apply to AMD. The steps taken by AMD and others to address these issues are as follows:

Issue #1: As reported previously, groundwater beneath the Site is impacted by off‐Site sources. Modifications to the GETS or other aggressive remedial actions, such as in situ bioremediation, will not expedite Site cleanup due to the ongoing impact from upgradient sources (AMEC Geomatrix, Inc. [AMEC], 2008; Geomatrix Consultants, Inc. [Geomatrix], 2008). These upgradient sources include the former AMD 901/902 Thompson Place site, the TRW Microwave (TRW) site, and the Philips Semiconductors (Philips) site. Under the direction of EPA, the responsible parties for these sites (AMD, Northrop Grumman, and Philips, respectively) are preparing feasibility studies to evaluate remedial alternatives to expedite groundwater cleanup. AMD submitted a Revised Focused Feasibility Study (FFS) for the former 901/902 Thompson Place site to EPA in 2013; the Revised FFS is currently under review by EPA. Other upgradient sources, including the Mohawk Laboratory site, are being remediated under Water Board oversight.

Issue #2: As part of the redevelopment, the Site is currently divided into two parcels. The owners of the two parcels, LS‐Sunnyvale, LLC (LandSea) and Taylor Morrison of California, LLC (Taylor Morrison), each recorded a new Land Use Covenant and Environmental Restriction on Property for their respective parcels with the Water Board in February 2018. The LandSea covenant was subsequently amended in September 2018.

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Issue #3: The 2014 5‐Year Review identified EPA as the implementing party with respect to this issue, and an Explanation of Significant Differences was not issued during the 2014‐2018 review period. The California MCL for hexavalent chromium was established on 1 July 2014 but was repealed on 11 September 2017. The California MCL for total chromium (50 micrograms per liter [µg/L]) specified in the Order is used in this report. Similarly, chloroform currently does not have a Federal or State MCL; the 50 µg/L cleanup goal specified in the Order is used. Finally, the most recent MCLs for ethylbenzene and 1,2,4‐trichlorobenzene are used in this 5YR Report.

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2. Site Background

The Site comprises approximately 24 acres of relatively flat land, at an average elevation of approximately 40 feet above sea level, 4 miles south of the southern end of San Francisco Bay. Single family residences and light commercial buildings occupy the area north of the Site, between East Duane Avenue and Highway 101; a school is located to the west of the Site; residential townhouses are located to the east of the Site; and light industrial/commercial properties lie to the south of the Site.

Two large low‐rise buildings, connected by a hallway, existed at the Site (Figure 2): the former AMD 915 main building (the larger building with an east‐west orientation), and the former AMD Submicron Development Center (the smaller building on the southwest portion of the Site). The western and eastern portions of the main building had basement dewatering systems consisting of a gravel layer drained by a network of 4‐inch perforated polyvinyl chloride pipes terminating at nine basement dewatering sumps. The dewatering system was approximately 14 feet below ground surface (bgs; Engineering Science, 1988). A network of nine groundwater extraction wells and 34 groundwater monitoring wells also existed at the Site, as well as a treatment system for removing COCs from extracted groundwater.

The two former on‐Site buildings were demolished and the Site is being redeveloped into residential housing. To facilitate the Site’s redevelopment, all nine of the original extraction wells were decommissioned and replaced with a new network of 12 extraction wells in 2015 and 2016. Fifteen monitoring wells were also decommissioned and replaced by 12 new monitoring wells between 2015 and 2017. The basement dewatering sumps of the previous AMD facility were removed in 2016 when the former buildings were demolished.

2.1 SITE HISTORY AND CHEMICAL USE

A chronology for the Site is presented in Table 1. AMD operated a semiconductor fabrication and research and development facility at the Site from 1974 until 2003, when AMD transferred ownership of the property to Spansion LLC, a joint venture of Fujitsu and AMD. In December 2005, Spansion LLC became Spansion, Inc., an independent entity from AMD specializing in manufacturing flash memory devices. Spansion, Inc. stopped manufacturing activities at the Site in 2009, sold the property to Watt Investments in Sunnyvale (Watt) in January 2014, and vacated the Site in June 2015. Watt then sold the property to LandSea in February 2016. LandSea demolished the on‐Site buildings in 2016 to redevelop the Site into residential housing units. The property was then subdivided, and portions were sold to several limited liability companies in 2017: The Vale PA‐1 Owner, LLC; The Vale PA‐2 Owner, LLC; and The Vale PA‐3 Owner, LLC (as Taylor Morrison). LandSea retained ownership of the remaining portion of the property. Taylor Morrison is redeveloping the northern portion of the property adjacent to East Duane Avenue, while LandSea continues to redevelop the rest of the property.

Chemicals historically used by AMD for semiconductor fabrication at the Site include solvents and corrosives (Engineering Science [ES], 1984). Records of chemical use prior to 1980 are not available; however, it has been inferred by others that trichloroethene (TCE) was used on‐Site until 1979 (ES, 1984). Solvent waste between 1980 and 1989 included primarily n‐butyl acetate and xylenes (stored in underground tanks) and Freon wastes (stored in drums at designated areas; Parsons ES, 1996).

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Underground vaulted and un‐vaulted storage tanks (USTs) with 1,500 to 3,000 gallon capacity were installed between 1974 and 1982 (ES, 1984). Below‐grade acid neutralization systems (ANSs) with 1,500 to 4,700 gallon capacity were installed in 1974 and 1980 and upgraded in 1982 (ES, 1984). Of the 21 tanks documented at the Site, two of these appeared to have leaked: one of the three tanks comprising the former “Pad C” ANS and the “Pad IV” 712‐D photoresist stripper tank (Parsons ES, 1996).

The primary on‐Site source for TCE in groundwater beneath the Site appears to have been a leak from one of the three tanks comprising the Pad C ANS (Woodward‐Clyde Consultants, 1983) (Figure 3). The ANS was removed in 1981, and in 1982, 5,737 cubic yards of TCE impacted soil was excavated from the area surrounding the former Pad C ANS to a depth of up to 34 feet bgs (Woodward‐Clyde Consultants, Inc., 1983).

A UST containing the 712‐D photoresist stripper was installed in 1977 and removed in 1981. Approximately 300 cubic yards of soil affected by trichlorobenzene, with lesser concentrations of benzene and xylenes, were excavated to a depth of approximately 16 feet bgs (Parsons ES, 1996).

Although AMD completed soil remediation in the early 1980s, some residual impacted soil had remained in place near an area where soil excavation was completed in late 1981. This residual impacted soil was not found until foundation demolition began, when, on 27 July 2016, soil with organic odors was encountered during deep earthwork near the northern exterior basement wall of the former facility. As described in Section 3.5.1, approximately 580 cubic yards of VOC‐impacted soil was removed from excavations in the former Pad IV area, adjacent to the limit of the former basement’s concrete pad (Haley & Aldrich, 2016).

2.2 NEARBY OFF‐SITE VOC RELEASE SITES

Three sites where volatile organic compounds (VOCs) have impacted groundwater exist south (upgradient) of the Site: the TRW Site at 825 Stewart Drive, the Philips Site at 811 East Arques Avenue, and the 901/902 Thompson Place Site. The Companies’ Offsite Operable Unit (OOU) extends north of the Philips, TRW, and 901/902 Thompson sites and defines an area where groundwater is impacted primarily by TCE. The OOU is located immediately west (cross‐gradient) of the 915 DeGuigne Drive Site.

Other sources of regional COC contamination have been documented upgradient of the Site, including the Mohawk plume, composed predominantly of cis‐1,2‐dichloroethene (cDCE) (Geomatrix, 2008; The Source Group, Inc., 2008). Because upgradient, off‐Site sources cause ongoing TCE and cDCE contamination in groundwater beneath the Site, the progress of past and ongoing remediation efforts has been substantially compromised, and groundwater beneath the Site will not meet cleanup goals, possibly for decades.

2.3 HYDROGEOLOGIC CONDITIONS

The Site is located within the confined portion of the Santa Clara Valley groundwater basin. Groundwater is encountered approximately 10 feet bgs and would naturally flow northward towards San Francisco Bay absent the influence of on‐Site and off‐Site groundwater extraction wells. Alluvial soils underlie the Site, where several relatively thin, channel‐like deposits of sands and gravels comprise the water‐bearing zones, which are both vertically and laterally separated by less permeable silty clays (ES, 1988). The major water‐bearing zones beneath the Site have been classified, from shallowest to deepest (up to approximately 100 feet bgs), as the A, B1, B2, and B3 Zones. The depth intervals designated for

5 ~~ICH each of the zones are not consistent among many of the early reports on Site hydrogeology; different interpretations of depth intervals for various zones likely occurred because of the complex nature of the alluvial system beneath the Site, where sand zones comprise elongated, channel‐type deposits that can occur at various depths and widths, with a meandering three‐dimensional configuration, rather than a series of horizontal, continuous layers. Nonetheless, A‐Zone wells are generally screened from 8 to 22 feet bgs; B1‐Zone wells are generally screened from 16 to 40 feet bgs; B2‐Zone wells are generally screened from 43 to 60 feet bgs; and the B3‐Zone depth interval is generally between 70 and 90 feet bgs (ES, 1988). As shown on Figures 4 through 6, the direction of the horizontal hydraulic gradient in the A, B1, and B2 Zones is generally to the north or northeast, although localized gradients exist due to groundwater extraction.

2.4 DISTRIBUTION OF COCS IN GROUNDWATER

The major COCs reported in groundwater samples above cleanup goals established in the Order are TCE and cDCE, both of which have been present in most groundwater samples from the A‐, B1‐, and B2‐Zone wells, but rarely in a former B3‐Zone well (50‐DDD), likely because of an upward gradient historically observed from the B3 to the B2 Zone (Haley & Aldrich, 2018a).

In the A‐Zone monitoring well samples collected in 2018, TCE concentrations beneath the western and central portions of the Site ranged from non‐detect (<0.5 µg/L in several wells) up to 90 µg/L (in well 54‐ S) in October 2018. In general, concentrations of cDCE are higher beneath the western portion of the Site (with a maximum of 65 µg/L in well 41‐S), and lower beneath the central portion of the Site (with a maximum of 30 µg/L in well 54‐S). COC concentrations beneath the Site are similar to concentrations upgradient of the Site, indicating that groundwater is likely impacted from upgradient, off‐Site sources. A‐Zone groundwater quality beneath the eastern portion of the Site has historically been influenced by an upgradient release from the former Mohawk Laboratories site (referred to as the “Mohawk plume”), which consists of cDCE, and lower concentrations of other COCs, including TCE. The Mohawk plume extends from the Mohawk Laboratories site, which is approximately 4,800 feet south (hydraulically upgradient) of the Site (The Source Group, Inc., 2005).

In the B1‐Zone samples collected in 2018, TCE was detected beneath both the western and central portions of the Site, at concentrations up to 56 and 82 µg/L, respectively. Concentrations of cDCE were generally highest along the western property boundary and south of the former 915 DeGuigne Drive building (i.e., 41‐D and 57‐D), with concentrations up to 160 and 100 µg/L, respectively. B1‐Zone groundwater beneath the Site is also likely impacted from upgradient, off‐Site sources.

In the B2 Zone, TCE concentrations were highest along the western property boundary (greater than 100 µg/L in off‐Site wells COM15B2 and T‐10C), consistent with upgradient, off‐Site sources. Lower concentrations of TCE and cDCE (both with maximum concentrations of 37 µg/L in well 56‐DD) were also present in the B2 Zone north of the former building beneath the central portion of the Site. The presence of TCE and cDCE in extraction wells, and the low concentrations detected in downgradient well 45‐DD (less than 1 µg/L for both TCE and cDCE) indicates these constituents are captured by the current B2‐Zone extraction wells at the northern property boundary.

Perhaps most importantly, COC concentrations in A‐, B1‐, and B2‐Zone groundwater samples collected from on‐Site and off‐Site wells located upgradient of known on‐Site release areas are within the same general range as those from within and downgradient of the release areas (Figures 7 through 9). This is

6 ~~ICH an indication that source area remediation is complete at the Site. Migration beyond the Site boundary is curtailed by operation of the on‐Site extraction wells.

2.5 GROUNDWATER EXTRACTION AND TREATMENT

The GETS system has been reconfigured multiple times since groundwater extraction began in 1984:

1. Starting in 1984, an air stripper system with granular activated carbon (GAC) treatment using a 40,000‐pound GAC vessel was used to treat effluent from the 915 DeGuigne Drive extraction wells (EW‐1 through EW‐9) and basement dewatering sumps, combined with extracted groundwater from the OOU; 2. Starting in 2012 (prior to Site redevelopment activities), an interim treatment system treating groundwater only from the 915 DeGuigne Drive extraction wells and basement dewatering sumps using two 2,000‐pound GAC vessels in series, with a backup air stripper system; a third 2,000‐pound GAC vessel was later added in series in 2013; and 3. During Site redevelopment activities in 2016, a replacement treatment system was installed to treat groundwater only from the newly‐installed 915 DeGuigne Drive extraction wells (EW‐10 through EW‐21) using two sets of three 2,000‐pound GAC vessels plumbed in series (Stantec, 2016d).

The previous (i.e., pre‐redevelopment) GETS at the Site included nine extraction wells (EW‐1 through EW‐9) and nine basement de‐watering sumps (BS‐1‐1, 1‐2, 2‐1, 2‐2, 3‐1, 3‐2, 4‐1, 4‐2, and 6) intercepting the A and B1 and B2 Zones. Extracted groundwater was conveyed to an on‐Site treatment system where COCs were removed from the extracted water by carbon adsorption, prior to permitted discharge to the storm drain (ultimately discharging to Calabazas Creek) or on‐Site for re‐use. The existing extraction wells and sumps were decommissioned in 2016 to facilitate Site redevelopment; the extraction wells were replaced by a new network of extraction wells (EW‐10 through EW‐21) installed in 2015 and 2016.

Treatment system readings collected in 2015, when all of the basement dewatering sumps last operated, indicated that influent to the previous groundwater treatment system consisted of the following flow streams, totaling 74 gpm:

 47 gpm from the extraction wells, of which approximately 15 gpm was contributed by well EW‐ 6; and  27 gpm from the basement dewatering sumps, of which approximately 11 gpm was contributed by a sump on the east side of the main building (BS‐6).

Operation of the current GETS is summarized in Section 3.2, and actions taken during the review period to replace the previous GETS are described in Section 3.5.4.

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3. Progress Since Last Review

The progress made over the review period (2014 through 2018) includes annual groundwater monitoring, operation and maintenance of the on‐Site groundwater extraction wells, a vapor intrusion evaluation, soil excavation, additional groundwater characterization, off‐Site transport and disposal, a revised Site groundwater monitoring plan and work completed by others at the Site related to Site redevelopment. These activities are further discussed below.

3.1 GROUNDWATER MONITORING PROGRAM

Each annual groundwater monitoring event includes measuring water levels and collecting groundwater samples from Site monitoring and extraction wells. The most recent monitoring event was conducted in October 2018, and the results are summarized in the 2018 Annual Groundwater Monitoring Report (Haley & Aldrich, 2019). Between 2014 and 2018, the monitoring program has included monitoring wells for water levels and COC concentrations at the locations shown in Figure 2. Table 2 summarizes the results from each year of monitoring. The monitoring program during this review period has shown the following:

 Water levels measured in wells are dependent on local groundwater extraction and precipitation levels. Over the reporting period, groundwater elevations fluctuated by approximately 1 to 2 feet in the A and B1 Zones, and approximately 3 to 5 feet in the B2 Zone;  Interpreted horizontal hydraulic gradient directions generally have been towards the north or northeast in the A, B1, and B2 Zones (Figures 4 through 6);  The number of wells where COC concentrations exceed cleanup goals established in the Order decreased in the A, B1, and B2 Zones over this review period; however, this comparison is complicated by the fact that many previous monitoring wells at the Site were decommissioned and replaced with new wells to facilitate Site redevelopment.  Maximum TCE concentrations reported for A‐, B1‐, and B2‐Zone monitoring wells decreased from 130 to 90 µg/L, 170 to 82 µg/L, and 150 to 37 µg/L, respectively, over this review period;  Maximum cDCE concentrations reported for A‐Zone, B1‐Zone, and B2‐Zone monitoring wells decreased from 75 to 62 µg/L, 350 to 160 µg/L, and 350 to 37 µg/L respectively over this review period;

In a letter dated 5 January 2018, the Water Board requested that AMD submit a revised Self‐Monitoring Plan for the Site because of the changes to the monitoring well network. The revised Self‐Monitoring Plan was submitted to the Water Board on 27 February 2018 (Haley & Aldrich, 2018b).

3.2 GROUNDWATER EXTRACTION AND TREATMENT SYSTEM

The previous GETS operated until 2016, when it was replaced to facilitate Site redevelopment. The current GETS at the Site is comprised of 12 extraction wells (EW‐10 through EW‐21) intercepting the A, B1, and B2 Zones and transporting the extracted water to an on‐Site treatment system. These wells extracted groundwater at a combined average flow ranging from approximately 13 to 18 gpm during this review period. B1‐Zone extraction well EW‐11 has consistently been pumped at the highest rates, ranging from approximately 4.5 to 5.5 gpm over this review period. As shown in Table 2:

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 Annual volume of groundwater extracted ranged from approximately 7.2 million gallons in 2018 to 40 million gallons in 2014 (again, this difference is due to replacement of the previous GETS as part of Site redevelopment); and  The total mass of VOCs removed ranged from a minimum of 5.7 pounds in 2018 to a maximum of 50 pounds in 2014. This majority of the decrease is due to the lower flow rates for the current system described above. The previous system extracted groundwater from both the extraction well network and basement dewatering sumps. Moreover, the previous extraction well network extracted groundwater impacted by off‐Site, upgradient sources (e.g., the Mohawk plume); the current network treats groundwater impacted by former on‐Site sources, which comprise a smaller area (see Section 4.3.1).

3.3 CONFIRMATION GROUNDWATER SAMPLING WITHIN FORMER PAD C EXCAVATION AREA

In 2007, a Site investigation was performed at the Site, which included the collection of grab groundwater samples from the former Pad C excavation area. One sample from boring SB‐6 (Figure 3) was reported to contain Freon 113 and TCE at concentrations of 130,000 µg/L and 1,000 µg/L, respectively (Geomatrix, 2008). The investigation concluded that the Freon 113 and TCE impacts were localized to the excavation area and likely represent former excavation water that was trapped in a thin zone at the base of the excavation backfill material. The report also concluded that because the concentration of Freon 113 outside the excavation limits was below cleanup goals, the cutoff walls installed during the excavation have physically isolated the groundwater both vertically and laterally within the perimeter of the cutoff walls.

In 2014, Haley & Aldrich conducted a field investigation to confirm whether the Freon 113 and TCE concentrations reported in 2007 at SB‐6 are representative of groundwater quality beneath the Pad C excavation backfill. To accomplish this, Haley & Aldrich installed and sampled three temporary monitoring wells (TMW‐1 through TMW‐3; Figure 3) in June 2014 and conducted two rounds of confirmation sampling (in June and December 2014) to evaluate the concentration distribution of Freon 113 and other VOCs in groundwater. The results were reported in the “Confirmation Groundwater Sampling Report” and “2014 Annual Groundwater Monitoring Report” (Haley & Aldrich, 2014c; Haley & Aldrich, 2015). In 2014, Freon 113 was detected at a maximum concentration of 25,000 µg/L, and TCE was detected at a maximum concentration of 400 µg/L. The concentrations detected in the December 2014 confirmation sampling event were lower than the concentrations detected in 2007, by between 60 percent and 81 percent.

Although the water within the former excavation boundary is impacted primarily by Freon 113 and other VOCs at levels above cleanup goals, this small volume of water has been physically isolated from the groundwater system by a series of cement cutoff walls installed as excavation shoring in 1982. This water is overlain by more than 20 feet of sand‐cement slurry forming a low permeability cap and barrier against vapor intrusion. Since VOC‐impacted water within the former excavation area does not pose a vapor intrusion risk or threat to future groundwater quality, no further investigation or remediation is warranted. The temporary wells were decommissioned to facilitate Site redevelopment.

3.4 VAPOR INTRUSION EVALUATION

As described in the previous 5YR Report (Haley & Aldrich, 2014a), indoor air sampling was previously conducted on behalf of AMD in August 2011 in the former on‐Site buildings to evaluate the potential for

9 ~~ICH vapor intrusion at the Site. Indoor air samples were collected in the former 915 DeGuigne Drive building and the attached Submicron Development Center. The field and analytical methods employed and the results of the investigation are described in the “Report of Results – Indoor Air Sampling” (AMEC, 2011). All results were below the applicable risk‐based screening levels (VISLs), indicating that potential vapor intrusion did not pose an unacceptable health risk in the former on‐Site buildings.

Additional Site characterization related to the vapor intrusion pathway has been completed throughout the Site and adjacent 936 East Duane Avenue and 943 DeGuigne Drive properties (adjacent properties) by others as part of environmental site assessments related to redevelopment of the Site and adjacent properties (Treadwell & Rollo, 2012a and 2012b; Ground Zero Analysis, Inc., 2013; ENGEO, Inc., 2013a; ENGEO, Inc., 2013b).

In January 2014, the Water Board requested additional information to further evaluate the potential for vapor intrusion, including a comparison of the methods used in the original evaluation to the recommended methods provided by EPA in two documents:

 2013 Office of Solid Waste and Emergency Response Guidance “External Review Draft – Final Guidance for Assessing and Mitigating the Vapor Intrusion Pathway from the Subsurface to Indoor Air”; and  3 December 2013 letter “USEPA Region 9 Guidelines and Supplemental Information Needed for Vapor Intrusion Evaluations at South Bay National Priorities List (NPL) Sites”

In response to this request, AMD submitted a Vapor Intrusion Evaluation Report (Haley & Aldrich, 2014b), which evaluated the previous methods and data with respect to the guidelines that EPA provided in its letter. The report concluded that the previous vapor intrusion evaluation was completed in accordance with EPA guidelines, and reiterated that COCs present in groundwater at the 915 DeGuigne Drive Site did not appear to be impacting indoor air at the former 915 DeGuigne Drive building at levels that would pose an unacceptable health risk. All COC concentrations reported in indoor air samples were below the applicable risk‐based screening levels (i.e., EPA’s Regional Screening Levels and California‐modified screening levels). Since the property was sold and redevelopment was planned, no further indoor air testing was recommended until future land use was determined.

3.5 WORK COMPLETED BY OTHERS

Consultants for the current property owners (LandSea and Taylor Morrison) conducted additional environmental activities during the review period as part of Site redevelopment. The work completed by others (primarily Stantec on behalf of the property owners) is described in the following sections.

3.5.1 Soil Excavation in the Former Pad IV Area and Northern Basement Edge

Site redevelopment required demolishing the Site buildings and excavating soil impacted by VOCs and compounds associated with other historical activities. Stantec prepared a “Proposed Hazardous Materials Mitigation Program” (Stantec, 2015a) on behalf of the property owner to describe the risk mitigation measures implemented prior to Site redevelopment, and proposed mitigation measures to address conditions during and following Site redevelopment.

Prior to demolition of on‐Site structures, Stantec prepared a Soil Management Plan (SMP; Stantec, 2014a) on behalf of the property owner that included guidance for handling soil and groundwater

10 ~~ICH potentially impacted by VOCs or organochlorine pesticides that could be encountered during excavation and grading. The SMP required a comparison of laboratory analytical results for VOCs detected in soil samples with the Environmental Screening Level (ESLs) for shallow soil exposure in residential settings to assess whether soil should be removed from the Site prior to redevelopment.

While conducting building foundation demolition on 27 July 2016, soil with organic odors was encountered during deep earthwork near the northern exterior basement wall of the former facility. Haley & Aldrich coordinated with Stantec to remove a total of 864 tons (approximately 580 cubic yards) of VOC‐impacted soil from excavations in the former Pad IV area, adjacent to the limit of the former basement’s concrete pad (Haley & Aldrich, 2016). The primary VOCs detected in soil were 1,2,3‐ trichlorobenzene and 1,2,4‐trichlorobenzene; of the 34 soil samples collected during the excavations, TCE was only detected in two samples, at low concentrations of 0.011 milligrams per kilogram or less. The soil was characterized and disposed of in accordance with the SMP. Approximately 18,800 gallons of excavation water were pumped to tanks, characterized, and disposed of in accordance with the SMP.

The excavation adjacent to the former building’s basement slab was backfilled with a low‐permeability cement slurry to a depth just above the static water table; the remainder of the excavation was backfilled with clean soil. The results of field screening and laboratory analysis of confirmation samples indicate that the lateral and vertical extents of VOC‐impacted soil were identified and the soil within those limits was removed. No further excavation was required under the SMP.

In October 2016 and December 2016, EPA conducted outdoor ambient air monitoring off‐Site to evaluate the possible contribution of on‐Site excavation and grading activities to air quality in the surrounding area. The Water Board submitted a memorandum to EPA in November 2016 to provide context for the air quality data collected at the residential area by EPA in October 2016 (Water Board, 2016). The memorandum explained that historical data do not indicate a suspected source of TCE in the areas where excavation and grading were taking place, and that the predominant wind direction during EPA’s October 2016 sampling event was away from the residential area north of the Site.

3.5.2 Soil Excavation Near Former PG&E Substation

Discolored soil was reported during the decommissioning of the former Pacific Gas and Electric Company (PG&E) substation located in the southwestern corner of the Site. To assess soil quality in this area, Stantec collected soil samples in January and December 2015 on behalf of the property owner in accordance with the SMP. Two areas containing total petroleum hydrocarbons in the diesel range (TPHd) in soil above the ESL were selected to be excavated. One area of excavation was at a former rainwater collection sump where soil samples did not contain any constituents above ESLs; however, the property owner chose to remove the sump. An approximately 10‐foot by 10‐foot area was also removed to approximately 8 feet bgs near the soil sampling location where TPHd was present at concentrations greater than its ESL (Stantec, 2017c).

Confirmation soil samples collected from the sidewalls of this excavation did not contain TPHd at concentrations greater than its ESL. One confirmation soil sample collected from the bottom of the excavation contained TPHd at a concentration greater than the ESL; however, the excavation was not extended below 8 feet bgs because groundwater filled the excavation.

Groundwater samples collected from monitoring well 41‐S, located approximately 100 feet north (downgradient) of the excavation area, did not contain TPHd above the laboratory reporting limits.

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Stantec concluded that the contamination appeared to be limited to the immediate area of the former PG&E substation excavation and does not pose a significant risk to the beneficial reuse of groundwater since a land use covenant for the area including the former PG&E substation prohibits groundwater use (Stantec, 2017c). The Water Board approved Stantec’s report on 18 October 2017.

3.5.3 Organochlorine Pesticide Soil Excavation

Stantec submitted a “Pesticide‐Impacted Soil Management Plan” (Stantec, 2016c) on behalf of the property owner to address management of excavated soil in specific areas where organochlorine pesticides were detected in soil above the ESLs. Design drawings providing details of the organochlorine pesticide‐impacted soil removal were subsequently submitted to the Water Board, which the Water Board approved on 8 July 2016. A completion report is not currently available.

3.5.4 GETS Relocation and Well Replacement Activities

The previous GETS, associated extraction wells, and a subset of the groundwater monitoring wells were decommissioned in 2016 to facilitate the Site’s redevelopment. Replacement of the previous GETS included the following activities:

 Stantec submitted a work plan for relocation of the GETS (Stantec, 2014b) on behalf of Watt to propose a permanent replacement GETS. Field investigations were proposed to determine extraction well placement and construction details. The work plan was approved by the Water Board on 18 December 2014;  After the Water Board approved the work plan for relocation of the GETS, a transect of ten soil borings and groundwater sampling locations were completed to design the new extraction wells, as documented in the “Groundwater Extraction and Treatment System Relocation: Phase 2 Report” submitted by Stantec on behalf of LandSea (Stantec, 2015b);  Twelve new extraction wells (EW‐10 through EW‐21) and one monitoring well (52‐D) were installed in 2015 and 2016, as documented in the “Groundwater Extraction and Treatment System Relocation: Phase 1 Report” and “Groundwater Extraction and Treatment System Relocation: Phase 2 Report” submitted by Stantec on behalf of LandSea (Stantec, 2015b; Stantec, 2016a); and  The new GETS and five additional monitoring wells (53‐S, 53‐DD, 54‐S, 54‐DD, and 55‐S) were installed in 2016, as documented in the “Groundwater Extraction and Treatment System Relocation: Final Report” submitted by Stantec on behalf of LandSea (Stantec, 2016d). The final report documented that the replacement system successfully captures groundwater impacted by former Site sources. This report was approved by the Water Board on 5 January 2018 (Water Board, 2018).

The current system captures groundwater downgradient of former Site sources at the downgradient property boundary. Modeling conducted during the installation showed that the lower flow rate from the current system’s extraction well network is sufficient to provide hydraulic capture of the areas downgradient of Site sources.

Stantec also submitted the “Well Destruction and Installation Work Plan” (Stantec, 2016b) on behalf of LandSea, which described the decommissioning of certain existing wells in conflict with the proposed redevelopment and the installation of six additional replacement wells (56‐S, 56‐D, 56‐DD, 57‐S, 57‐D,

12 ~~ICH and 57‐DD); the work plan was approved by the Water Board on 1 July 2016. All existing (pre‐ redevelopment) wells were decommissioned with the exception of the following wells, which will remain following Site redevelopment: 2‐S, 10‐D, 19‐S, 19‐D, 40‐S, 40‐D, 41‐S, 41‐D, 45‐DD, 49‐S, 49‐D, and 49‐DD. In 2016 and 2017, Stantec completed the well decommissioning and well installation activities described in the Work Plan, and Haley & Aldrich conducted quarterly monitoring of the newly installed monitoring wells in accordance with the work plan.

During Site redevelopment, it was found that well 49‐D was in conflict with features associated with the new residential buildings. Stantec submitted the “Well Destruction and Replacement Well Installation Report” (Stantec, 2018a) on behalf of LandSea to document the replacement of well 49‐D with 49‐DR, which is located approximately 10 feet south of 49‐D and has a similar screened interval.

3.5.5 Vapor Intrusion Mitigation

Following demolition of the former on‐Site buildings, Stantec collected soil gas samples on behalf of the property owner to evaluate the potential for vapor intrusion into the future residential buildings. TCE concentrations in soil gas samples were above the screening levels at five sampling locations. Nine of the future residential buildings were identified for post‐construction air monitoring, where soil gas TCE concentrations exceeded the ESL. The soil gas sampling was documented in the Vapor Mitigation Plan (VMP) (Stantec, 2017a) on behalf of LandSea.

Stantec submitted the VMP to document the vapor intrusion evaluation, vapor intrusion mitigation (VIM) system design, and description of post‐construction monitoring; the VMP was approved by the Water Board on 10 May 2017. The Water Board’s approval letter required submittal of a financial assurance plan (submitted on 20 November 2017), reports documenting the installation of the VIM system for each phase of the development, and VIM system monitoring reports documenting the VIM system inspections and the results of the sub‐barrier vapor samples.

LandSea and Taylor Morrison are installing VIM systems beneath all new residential buildings currently being constructed at the Site. The VIM systems consist of vapor barriers with sub‐slab venting systems and were designed to operate in the passive mode with the ability to be converted to active systems. The residential building construction began in 2017 and will continue into 2019.

Stantec submitted a “Vapor Intrusion Mitigation System Operation and Maintenance Manual” (Stantec, 2017b) on behalf of LandSea to describe the long‐term operation and maintenance of the VIM systems, which was approved by the Water Board on 13 December 2018. The Water Board’s approval letter required quarterly VIM system monitoring reports and annual VIM system inspection reports. The property owners will be responsible for submitting these reports.

Post‐construction sub‐barrier vapor sampling began in 2018 at four of the nine post‐construction assessment buildings identified in the VMP. Available results indicate that none of the reported VOCs were detected above their respective ESLs (Stantec, 2018b).

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4. Remedial System Performance and Effectiveness

4.1 REMEDIAL OBJECTIVES

The objective of the remediation program for the Site is to limit the potential for COCs to migrate off‐ Site from on‐Site sources. The cleanup goals for groundwater are the more stringent of the Federal or California MCL for drinking water for each of the COCs. The cleanup goals for groundwater are listed below:

Compound Cleanup Goal (µg/L) Benzene 1 Total Chromium 50 Chloroform 50 1 Dichlorodifluoromethane NA 2 1,1‐Dichloroethane 5 1,1‐Dichloroethene 6 cis‐1,2‐Dichloroethene 6 trans‐1,2‐Dichloroethene 10 Ethylbenzene 300 3 Freon 113 1,200 Tetrachloroethene 5 Toluene 150 3 1,2,4‐Trichlorobenzene 5 3 1,1,1‐Trichloroethane 200 Trichloroethene 5 Trichlorofluoromethane 150 Vinyl Chloride 0.5 4 Xylenes 1,750 1 Chloroform does not have an MCL; the value specified in the Order is used. 1 NA indicates that the ROD and Order did not establish a cleanup goal for this compound. 3 Cleanup goal has changed since the Order due to a change in MCL. 4 Vinyl chloride is present in Site groundwater and is a COC identified in the ROD but is not a COC listed in the Order.

4.2 SOIL

No soil cleanup goals were established in the Order, and source area soil remediation is complete at the Site. As described in Section 3.5, additional voluntary soil cleanup occurred during Site redevelopment activities. Haley & Aldrich coordinated with Stantec to remove a total of 864 tons (approximately 580 cubic yards) of soil from excavations in the former Pad IV area (Haley & Aldrich, 2016). Other soil containing compounds not associated with former AMD operations at the Site (e.g., organochlorine pesticides and TPHd near the former PG&E substation) was removed by Stantec on behalf of the property owner.

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4.3 GROUNDWATER

4.3.1 Evaluation of Hydraulic Containment

Water levels were measured in Site monitoring wells in October 2018. Groundwater elevation contours for the A, B1, and B2 Zones are shown on Figures 4 through 6, respectively. Historical water level data in Site monitoring wells are included as Appendix A. The general direction of the horizontal hydraulic gradient in the A and B1 Zones is to the north‐northeast. However, the interpreted A‐Zone potentiometric surface displays a depression surrounding extraction wells EW‐13 and EW‐16 through EW‐19. Well EW‐12 is also screened in the A Zone but a stronger influence from other A‐Zone extraction wells on the potentiometric surface is shown in Figure 4. The B1‐Zone potentiometric surface likewise displays a depression surrounding extraction wells EW‐15 and EW‐21; the area surrounding B1‐Zone extraction wells EW‐11 and EW‐20 exhibits a less pronounced effect on potentiometric surface. Localized groundwater flow is towards these wells from the south, west, and east.

The former source area (Pad C ANS system) is located within the expected capture zone of the A‐ and B1‐Zone extraction wells. Furthermore, the former Pad C excavation area is physically contained by the excavation cutoff walls, as described in the Subsurface Investigation Report (Geomatrix, 2008), and confirmed through subsequent confirmation sampling events (Haley & Aldrich, 2014c; Haley & Aldrich, 2015). The capture zone for the four extraction wells appears to be larger than the footprint of the former source area, indicating that the wells effectively capture groundwater affected by COCs from both on‐Site and off‐Site sources.

The direction of the horizontal hydraulic gradient in the B2 Zone is generally to the northeast; however, a depression exists around extraction wells EW‐10 and EW‐14, with the area surrounding EW‐10 exhibiting a larger decrease in water levels. Localized groundwater flow is towards these wells from the south, west, and east, affecting groundwater flow in the central portion of the Site north of the former 915 DeGuigne Drive building.

The total extraction well flow rates for the current GETS are lower than those for the previous GETS. As part of the Site redevelopment activities, the previous groundwater extraction program was modified, such that hydraulic containment is sustained but at lower groundwater extraction rates. Numerical modeling was performed after installation and testing of the replacement GETS (Stantec, 2016d) to evaluate hydraulic capture of the GETS. The model utilized actual operational data (i.e., extraction rates) and measured groundwater elevations following installation of the system and determined that groundwater within the target area1 in each water‐bearing zone is anticipated to be captured by the GETS, maintaining effective hydraulic control. The Water Board approved the evaluation in a letter dated 5 January 2018 (Water Board, 2018).

As can be seen in the table below, the total average pumping rate for the A Zone is consistent with the target pumping rate, and the groundwater elevation contours for October 2018 indicate capture of groundwater downgradient of Site sources. The total average pumping rates for the B1 and B2 Zones are below their target pumping rates; this is believed to be due to clogging/fouling of the pumps over time, and the operation of the system with generator power during most of 2018 due to Site redevelopment (as opposed to a dedicated power source), which lowered the efficiency of the pumps. Permanent

1 The target area is defined as the interpreted extent of dissolved TCE in groundwater above the cleanup goal that can be attributed to on‐Site sources.

15 ~~ICH power was re‐established in September 2018, and the extraction pumps will be pulled and cleaned/maintained at a higher frequency in the future, to improve pumping rates. Nevertheless, groundwater elevation contours for the B1 and B2 Zones indicate capture of groundwater downgradient of Site sources.

Target 2016 Average 2017 Average 2018 Average Pumping Rate 1 Pumping Rate 2 Pumping Rate 2 Pumping Rate 2 Well ID (gpm) (gpm) (gpm) (gpm) A Zone EW‐12 0.7 0.6 1.5 0.7 EW‐13 0.3 0.3 0.4 0.5 EW‐16 1.4 1.3 2.6 2.3 EW‐17 1.4 1.0 1.3 1.1 EW‐18 0.8 0.9 2.0 0.6 EW‐19 0.5 0.3 0.2 0.2 TOTAL 5.1 4.4 8.0 5.4 B1 Zone EW‐11 5.8 5.5 5.7 4.5 EW‐15 1.2 0.9 0.9 0.8 EW‐20 0.9 0.8 0.6 0.4 EW‐21 0.3 0.4 0.3 0.2 TOTAL 8.2 7.6 7.5 5.9 B2 Zone EW‐10 1.9 1.8 1.4 1.0 EW‐14 4.6 2.5 1.7 1.5 TOTAL 6.5 4.3 3.1 2.5 1 Target pumping rate refers to the average extraction flow rate at approximately steady‐ state conditions observed during testing of the extraction well network by a consultant for the property owner (Stantec, 2016d). 2 Average pumping rate for calendar years 2016, 2017, and 2018 refers to the average operational pumping rate (i.e., average pumping rate excluding GETS downtime).

4.3.2 Concentration Trends

Historical chemical concentrations detected in samples collected from Site monitoring wells are included as Appendix B. The concentration trend plots for the two main COCs (TCE and cDCE) are included as Figures 7 through 9; note that analytical results for cDCE are not available prior to 1992. The major conclusions from these trend analyses are discussed below.

4.3.2.1 Concentration Trends Relative to Source Areas

Modifications to the monitoring network were performed during this 5YR to accommodate Site redevelopment. Many of the original monitoring wells were decommissioned and replaced with new monitoring wells, and the extraction well network was relocated from the interior of the Site to the northern edge of the Site along East Duane Avenue. Therefore, the evaluation herein relies on data presented in Figures 7 through 9 for current monitoring network as well as data presented in the

16 ~~ICH previous 5YR Report for the previous monitoring network. Concentration trends presented in the previous 5YR Report are included as Appendix C.

A decrease in TCE concentrations for groundwater samples from a number of monitoring wells adjacent to and downgradient of the former source area is observed between 1982 and 1997. This indicates that the soil excavation and dewatering program successfully removed TCE from the subsurface, and there was very little COC mass left to sustain higher COC concentrations in groundwater. Several historical wells that have since been removed (e.g., 8‐S, 11‐S, 11‐DD, 18‐S, and 43‐DD) and currently‐monitored wells (45‐DD, 52‐D, 54‐D, and 55‐S) located adjacent to or downgradient of the former source area had, or currently have, concentrations of TCE near or below the Site cleanup goals.

TCE and cDCE concentration trends for many monitoring wells farther away from the source area, including upgradient (e.g., 41‐S, 41‐D, 49‐S, and 57‐D) and cross‐gradient wells (e.g., 40‐S and 40‐D), have comparable or higher concentrations than wells adjacent to or downgradient of the former source area. Furthermore, concentrations detected in grab groundwater samples collected at the upgradient (southern) edge of the property during the 2007 Site characterization (Geomatrix, 2008), and in groundwater samples from off‐Site upgradient wells in 2018 (as reported by others), are comparable to or higher than downgradient wells on the Site. This indicates that source remediation at the Site is complete, and Site wells are monitoring impacts from upgradient, off‐Site sources.

A‐Zone well 56‐S is the nearest well downgradient of the former Pad C ANS (historical on‐Site TCE source area). Concentrations of TCE and cDCE have decreased in this area (which includes former well 8‐S, located in the vicinity of 56‐S and with similar COC concentrations as 56‐S) by more than one order of magnitude since monitoring began in 1982 (Figure 7 and Appendix C). Similar decreases have been observed in the area of downgradient well 55‐S (which includes former wells 11‐S and 18‐S, located in the vicinity of 55‐S and with similar COC concentrations as 55‐S), where concentrations of TCE and cDCE are currently below cleanup goals (Figure 7 and Appendix C). The concentration trend for B1‐Zone well 56‐D (near former well 20‐D, downgradient of the former Pad C ANS and with similar COC concentrations), and B2‐Zone wells 54‐DD and 56‐DD (near former wells 32‐DD and 18‐DD, respectively, downgradient of the former Pad C ANS, and with similar COC concentrations) show similar trends, where concentrations initially greater than 1,000 µg/L have decreased to close to or less than 100 µg/L, with the greatest decrease occurring between approximately 1982 and 1995, and more or less leveling out in recent years (Figures 8 and 9, and Appendix C). This decreasing trend for wells adjacent to and downgradient of the former source area is an indication that the excavation (completed in 1982), and subsequent groundwater extraction, have been successful in removing most of the TCE related to the former ANS leak from soil and groundwater.

4.3.2.2 Concentration Trends in Each Water‐Bearing Zone

The concentrations of TCE and cDCE for samples collected from a majority of other A‐Zone monitoring wells have remained generally consistent, and greater than their cleanup goals, for the reporting period of 2014 to 2018. Wells 2‐S, 40‐S, 41‐S, and 49‐S on the western portion of the Site are likely affected by an upgradient, off‐Site source of COCs (Geomatrix, 2008). Although monitoring wells are no longer located on the eastern portion of the property, sampling results from the last two sampling events (2014 and 2015) in wells 3‐S and 31‐S on the eastern portion of the property showed that groundwater continued to be affected by COCs (predominantly cDCE) associated with an upgradient, off‐Site source. In general, TCE is detected at higher concentrations than cDCE in the western and central portions of the

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Site, while cDCE has historically been detected at similar or higher concentrations than TCE in the eastern portions of the Site.

Concentrations of TCE and cDCE for groundwater samples from the B1‐Zone monitoring wells have remained low (below their cleanup goals) in monitoring wells 52‐D and 49‐DR (adjacent to former well 49‐D). In wells 19‐D and 56‐D (and former well 20‐D, located in the vicinity of 56‐D), concentrations of these COCs had previously decreased to the point where they were near or below the cleanup goal; however, a rebound was observed during the previous review period and concentrations have remained relatively stable during the current review period. Concentrations of TCE and cDCE have remained stable or decreased in the other B1‐Zone wells during this reporting period. Wells 10‐D, 40‐D, 41‐D, and 49‐DR are likely affected by an upgradient, off‐Site source of COCs based on the results of the 2007 Site investigation (Geomatrix, 2008), and the results for well 57‐D (which is located south of the former 915 building and upgradient of any Site sources).

Concentrations of TCE and cDCE in samples collected from the B2‐Zone well 49‐DD remained stable (non‐detect) during the review period. TCE and cDCE concentrations in downgradient wells 45‐DD and 54‐DD also remain below the cleanup goals. In well 53‐DD (in between former wells 42‐DD and 43‐DD, in the northwestern corner of the Site; Appendix C), TCE concentrations were greater than cDCE concentrations and remained above the cleanup goal during the review period, while cDCE concentrations remained below the cleanup goal during the review period. This well is likely influenced by upgradient, off‐Site sources similar to other wells located in the western portion of the Site. TCE and cDCE concentrations remained stable or decreased during the reporting period for wells 56‐DD (near former wells 20‐DD and 32‐DD) and 57‐DD.

In summary, the concentrations of COCs detected in wells and in depth‐discrete groundwater samples (Geomatrix, 2008) both upgradient and downgradient of the former source area are similar, suggesting that the groundwater beneath the Site is impacted by upgradient, off‐Site sources of VOCs, and that the former Pad C ANS source area is no longer a significant impact to groundwater.

4.3.3 Concentrations in the PAD C Excavation Area

As described in Section 3.3, and documented in the “Confirmation Groundwater Sampling Report” and “2014 Annual Groundwater Monitoring Report” (Haley & Aldrich, 2014c; Haley & Aldrich, 2015), confirmation groundwater samples collected in June and December 2014 indicated that concentrations of Freon 113 were lower than the concentrations previously detected in the 2007 Site investigation, by between 60 percent and 81 percent. Although the water within the former excavation boundary is impacted by Freon 113 and other VOCs at levels above cleanup goals, this small volume of water has been physically isolated from the groundwater system. Moreover, this water is overlain by more than 20 feet of sand‐cement slurry forming a low permeability cap and barrier against vapor intrusion. Since VOC‐impacted water within the former excavation area does not pose a vapor intrusion risk or threat to future groundwater quality, no further investigation or remediation is warranted.

4.3.4 Extraction Mass Removal and Efficiency

Approximately 109 million gallons of water were extracted and nearly 129 pounds of total VOCs were removed by the GETS over this review period (Table 3). Since groundwater extraction began in 1984, approximately 1.1 billion gallons of water, and 5,844 pounds of total VOCs have been removed. The average mass removal efficiency has decreased steadily since well extraction data became available in

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1997 (Table 4). An approximate average mass removal efficiency of 3.8 pounds per million gallons was calculated in the first year and has since decreased to 0.8 pounds per million gallons in 2018 (Figure 10).

Table 4 also presents the annual cost for operation and maintenance of the GETS, and associated groundwater extraction and permit fees paid to local and state agencies. Due to the decreasing efficiency of the system to remove COCs from the subsurface (as remediation progresses, influent concentrations decrease, lowering efficiency), the cost per pound of COCs removed has steadily risen over time.

4.4 VAPOR INTRUSION

Based on the results of the indoor air sampling conducted in the former building located at 915 DeGuigne Drive, the vapor intrusion assessment concluded that there was no apparent unacceptable human health risk posed by groundwater at the Site (AMEC, 2011; Haley & Aldrich, 2014b). New residential buildings are being constructed with VIM systems consisting of vapor barriers and passive venting systems (with the ability to be made active). Post‐construction sub‐barrier sampling conducted in 2018 shows that VOC concentrations remain below the ESLs identified in the VMP (Stantec, 2018b).

4.5 INSTITUTIONAL CONTROLS

In December 2018, Haley & Aldrich subcontracted with Environmental Data Resources, Inc. of Shelton, Connecticut, to conduct a title search on the 915 DeGuigne Drive property and identify any environmental liens, and other activity and use limitations such as engineering controls and institutional controls.

As described in Section 1.3, the current property owners each recorded a Covenant and Environmental Restriction with the Water Board on 20 February 2018, one of which was amended on 10 September 2018. Institutional controls in the form of deed restrictions have been implemented, including the following:

 prohibiting the extraction of groundwater for any use other than for groundwater cleanup;  prohibiting the use of the property for hospitals, schools, day care centers, or senior citizen centers; and  requiring Site owners to comply with the VMP and VMS Operation and Maintenance Plan and prohibiting tampering with the VIM systems (Appendix D).

The deed restrictions are risk management measures that are designed to prevent exposure to TCE from drinking Site groundwater and inhalation of indoor air and are part of the overall remedy designated in the Order and Record of Decision for the Site (EPA, 1991).

4.6 COST EVALUATION

From 1981 through 2013, the total cost of addressing soil and groundwater contamination beneath the Site was reported to be $9,425,000 (Haley & Aldrich, 2014a). Since that time, AMD has spent approximately $0 on capital expenditures and $1,707,000 on operation and maintenance of the GETS, groundwater monitoring, investigation and remediation of groundwater and soil, consulting fees, and

19 ~~ICH agency oversight fees (based on information provided by AMD), amounting to approximately $1,707,000 for this review period.

The total cost of remediation to date is $11,132,000. Haley & Aldrich anticipates that the future annual remediation costs will be approximately $230,000 per year; an estimate of the total future remediation cost is not possible because the duration of GETS operation is unknown.

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5. Conclusions and Recommendations

This 5YR Report concludes the following:

Based on the evaluation of historical data from the Site, it appears that AMD’s remediation of on‐Site sources was substantially, if not fully, complete by the mid‐1990s and the continued operation of the GETS primarily addresses off‐Site releases.

The lines of evidence for this conclusion are:

 As discussed in Section 2.1, the use of TCE at the Site was short‐lived (1974 – 1979). The discharge of TCE was reported to have occurred at an underground tank, and it is likely that some time was required for the tank condition to degrade to the point of failure where constituents were released. AMD excavated COC‐affected soil from this source area within 9 years of AMD beginning operation at the Site; this likely was less than 9 years after the initial TCE release had occurred. This short residence time for TCE in the subsurface explains the apparent limited TCE migration off‐Site. Therefore, the timeframe for TCE contact with soil was relatively short; diffusion of TCE into fine‐grained units would not be sufficient for long‐term TCE‐back diffusion to substantially impact water quality.  Upon discovery of the TCE release in 1982, AMD quickly implemented an aggressive soil excavation and dewatering program that extended to depths greater than 30 feet bgs; the program included over‐excavating the entire tank pit depth by more than 10 feet, and by several feet in all lateral dimensions. The shoring for the excavation remained in place as a physical containment system for residual VOCs immediately beneath the base of the excavation backfill (Geomatrix, 2008).  Rapid initial declines in TCE concentrations in groundwater samples from the vicinity of the release area, over the first 5 to 10 years of groundwater monitoring (Figures 7 through 9, and Appendix C), is consistent with the cleanup of a relatively young release, where TCE had little time to diffuse into fine‐grained layers.  Concentrations of COCs observed in wells located hydraulically upgradient of the former Site sources are comparable to those within or downgradient of the Site sources.

Additional on‐Site remediation will not result in meeting cleanup goals in the near future because of upgradient COC sources.

Because of the aforementioned COC impacts to groundwater quality from off‐Site sources, the timeframe to reach cleanup goals depends on the progress of cleanup at upgradient Sites and the migration of clean groundwater to the 915 DeGuigne Drive Site from upgradient sites once they have achieved cleanup goals. This is an important consideration, and one that EPA noted in its previous 5YR. As previously discussed, under the direction of EPA, the responsible parties for upgradient sites (AMD, Northrop Grumman, and Philips) are preparing feasibility studies to evaluate remedial alternatives to expedite groundwater cleanup. AMD submitted a Revised FFS for the former 901/902 Thompson Place site to EPA in 2013; the Revised FFS is currently under review by EPA. Other upgradient sources, including the former Mohawk Laboratories site, are being cleaned up under Water Board oversight.

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The Site poses no unacceptable risk to human health and the environment.

The two potential routes of human exposure to contaminants in groundwater are ingestion (drinking water) and inhalation (of vapors off‐gassing from groundwater). The deed restrictions recorded on the Site parcels are designed to prohibit the use or ingestion of shallow groundwater beneath the Site. The deed restrictions also prohibit tampering with the VIM systems at the new residences that are being constructed on‐Site, which are designed to prevent migration of contaminants into indoor air and thus prevent inhalation. Collectively, these measures are designed to eliminate any potential unacceptable risk to human health or the environment.

Based on the above conclusions, this 5YR Report recommends the following:

 Continue to operate the GETS to main hydraulic control of groundwater impacted with COCs from both on‐ and off‐Site sources.  Conduct groundwater monitoring events at the Site on an annual basis.  Support the EPA’s efforts to expedite groundwater cleanup at the upgradient sites.

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6. References

1. AMEC Geomatrix, Inc., 2008. Third Five‐Year Review Report, 915 DeGuigne Drive, Sunnyvale, California, 31 December.

2. AMEC Geomatrix, Inc., 2011. Report of Results – Indoor Air Sampling, 915 DeGuigne Drive, Sunnyvale, California, 11 October.

3. California Regional Water Quality Control Board, San Francisco Bay Region, 1991. Order No. 91‐ 101, Site Cleanup Requirements for: Advanced Micro Devices, 915 DeGuigne Drive, Sunnyvale, Santa Clara County, June.

4. California Regional Water Quality Control Board, San Francisco Bay Region, 2016. Indoor and Outdoor Air Quality Data Near Former Advanced Micro Devices Building 915 DeGuigne Drive, Sunnyvale, SL720051206 & 43S0836, 21 November.

5. California Regional Water Quality Control Board, San Francisco Bay Region, 2018. Approval of Groundwater Extraction and Treatment System Relocation, 915 DeGuigne Drive, Sunnyvale, Santa Clara County, 5 January.

6. ENGEO, Inc., 2013a. Workplan for a Phase II Environmental Site Assessment, Spansion Site, 915 DeGuigne Drive, Sunnyvale, California, 16 October.

7. ENGEO, Inc., 2013b. Phase II Environmental Site Assessment, Spansion Site, 915 DeGuigne Drive, Sunnyvale, California, 5 November.

8. Engineering Science, Inc., 1984. Summary Report of Groundwater Investigations at AMD Building 915, Advanced Micro Devices, Sunnyvale, California, 27 December.

9. Engineering Science, Inc., 1988. Summary Report III: Groundwater Investigations at AMD Building 915, January 1986 through June 1988, Advanced Micro Devices, Sunnyvale, California, December.

10. Geomatrix Consultants, Inc., 2008. Subsurface Investigation Report, Former Advanced Micro Devices, 915 DeGuigne Drive, Sunnyvale, California, 31 January.

11. Ground Zero, Inc., 2013. Subsurface Investigation Report, Proposed Spansion Park Dedication, 915/943 DeGuigne Drive, Sunnyvale, California, RWQCB Case No. 2020423, 29 May.

12. Haley & Aldrich, Inc., 2014a. Fourth Five‐Year Review Report, 915 DeGuigne Drive, Sunnyvale, California, 31 January.

13. Haley & Aldrich, Inc., 2014b. Vapor Intrusion Evaluation Report, 915 DeGuigne Drive, Sunnyvale, California, 28 February.

14. Haley & Aldrich, Inc., 2014c. Confirmation Groundwater Sampling Report, 915 DeGuigne Drive, Sunnyvale, California, 31 July.

23 ~~ICH

15. Haley & Aldrich, Inc., 2015. 2014 Annual Groundwater Monitoring Report, 915 DeGuigne Drive, Sunnyvale, California, 30 January.

16. Haley & Aldrich, Inc., 2016. Soil Excavation and Removal Report, 915 DeGuigne Drive, Sunnyvale, California, 14 December.

17. Haley & Aldrich, Inc., 2018a. 2017 Annual Groundwater Monitoring Report, 915 DeGuigne Drive, Sunnyvale, California, 31 January.

18. Haley & Aldrich, Inc., 2018b. Revised Self‐Monitoring Program, 915 DeGuigne Drive, Sunnyvale, California, 27 February.

19. Haley & Aldrich, Inc., 2019. 2018 Annual Groundwater Monitoring Report, 915 DeGuigne Drive, Sunnyvale, California, 30 January.

20. Parsons Engineering Science, 1996. Five‐Year Review Report for the Advanced Micro Devices, Inc., 915 DeGuigne Drive Facility, Sunnyvale, California, 19 June.

21. Stantec Consulting Services, Inc., 2014a. Soil Management Plan, 915 DeGuigne Drive, Sunnyvale, California, 19 May.

22. Stantec Consulting Services, Inc., 2014b. Groundwater Extraction and Treatment System Relocation, 915 DeGuigne Drive, Sunnyvale, California, 14 August.

23. Stantec Consulting Services, Inc., 2015a. Proposed Hazardous Materials Mitigation Program, 915 DeGuigne Drive, Sunnyvale, California,” 29 January.

24. Stantec Consulting Services, Inc., 2015b. Groundwater Extraction and Treatment System Relocation: Phase 1 Report, 915 DeGuigne Drive, Sunnyvale, California, 15 December.

25. Stantec Consulting Services, Inc., 2016a. Groundwater Extraction and Treatment System Relocation: Phase 2 Report, 915 DeGuigne Drive, Sunnyvale, California, 25 March.

26. Stantec Consulting Services, Inc., 2016b. Well Destruction and Installation Work Plan – 915 DeGuigne Drive, Sunnyvale, California, 30 June.

27. Stantec Consulting Services, Inc., 2016c. Pesticide‐Impacted Soil Management Plan, The Vale Development Project, 915 DeGuigne Drive, Sunnyvale, California, 1 July.

28. Stantec Consulting Services, Inc., 2016d. Groundwater Extraction and Treatment System Relocation: Final Report, 915 DeGuigne Drive, Sunnyvale, California, 29 August.

29. Stantec Consulting Services, Inc., 2017a. Vapor Mitigation Plan, The Vale Development Project, Former Spansion Facility, Sunnyvale, California, 915 and 943 DeGuigne Drive, Sunnyvale, California, 20 March.

30. Stantec Consulting Services, Inc., 2017b. Vapor Intrusion Mitigation System Operation and Maintenance Manual, 915 DeGuigne Drive, Sunnyvale, California, 19 July.

24 ~~ICH

31. Stantec Consulting Services, Inc., 2017c. Phase II Shallow Soil Investigation and Excavation of the PG&E Substation, 915 DeGuigne Drive, Sunnyvale, California, 15 September.

32. Stantec Consulting Services, Inc., 2018a. Well Destruction and Replacement Well Installation Report, 10 April.

33. Stantec Consulting Services, Inc., 2018b. Vapor Intrusion Monitoring Report, 915 DeGuigne Drive, Sunnyvale, California, 28 August.

34. The Source Group, Inc., 2008. Semi‐Annual Self‐Monitoring Report Quarter 1 and Quarter 2, 2008, Mohawk Laboratories, 932 Kifer Road, Sunnyvale, California, 30 July.

35. Treadwell & Rollo, 2012a. Limited Phase II Environmental Site Assessment, 915 DeGuigne Drive, Sunnyvale, California, 20 January.

36. Treadwell & Rollo, 2012b. Human Health Risk Assessment, 915 DeGuigne Drive, Sunnyvale, California, 10 February.

37. United States Environmental Protection Agency, 1991. Superfund Record of Decision: Advanced Micro Devices #915, CA, EPA/ROD/R09‐91/066, August.

38. United States Environmental Protection Agency, 2009. Third Five‐Year Review, Advanced Micro Devices Site, 915 DeGuigne Drive, Sunnyvale, Santa Clara County, California, September.

39. United States Environmental Protection Agency, 2014. Fourth Five‐Year Review Report for Advanced Micro Devices, Inc. (Building 915) Superfund Site, Santa Clara County, California, September.

40. Woodward‐Clyde Consultants, Inc., 1983. System C Soil Reclamation Project, Advanced Micro Devices, Sunnyvale, California, 14 April.

\\haleyaldrich.com\share\oak_common\Advanced Micro Devices\2_915 DeGuigne Drive\Deliverables\Five‐Year Report\2019_Five‐Year Review Report\1_text\2019_0129_HAI_Five‐Year_Report_915 DeGuigne_D.docx

25 ~~ICH

TABLES

TABLE 1 Page 1 of 2 SITE CHRONOLOGY1 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

Year Activity Installation of 33 monitoring wells 1981 Soil Investigation near Pad IV photoresist stripper tank Removal of Pad IV photoresist stripper tank and soil excavation 1982 Initiation of groundwater monitoring 1982‐1983 Removal of Pad C acid neutralization system and soil excavation 1983 Installation of of extraction wells EW‐1 through EW‐4 Groundwater extraction and treatment system (GETS) begins operation 1984 Installation of extraction wells EW‐5 and EW‐6 Monthly groundwater monitoring begins 1985 Groundwater monitoring moved to a bimonthly basis 1986 Installation of 2 additional monitoring wells (44‐DD and 45‐DD) and extraction well EW‐7 Installation of extraction well EW‐8 1988 Groundwater monitoring moved to a quarterly basis Installation of 2 additional monitoring wells (51‐D and 50‐DDD) 1990 Additional soil Investigation at former Pad IV photoresist stripper tank excavation is conducted 1991 Installation of 3 additional monitoring wells (49‐S, 49‐D, and 49‐DD) 1992 Installation of extraction well EW‐9 Groundwater monitoring moved to a semiannual basis 1996 Five‐Year Review Report submitted to the Water Board 1998 Groundwater monitoring moved to an annual basis 2000 Adjustments made to the GETS Installation of monitoring well NMW‐10 on the site by The Source Group, Inc., consultant for Mohawk 2001 Laboratories Five‐Year Review Report submitted to the Water Board Installation of monitoring well NMW‐13 on the site by The Source Group, Inc., consultant for Mohawk 2004 Laboratories Extraction well EW‐3 was shutdown because it was pumping at a very low rate, and volatile organic compound 2006 (VOC) concentrations ranged from non‐detect to less than 5 micrograms per liter Subsurface investigation conducted in November 2007 to better delineate the distribution of VOCs in the 2007 subsurface Assessment of the potential for VOCs in groundwater to impact indoor air Extraction wells EW‐5 and EW‐6 reclassified as A‐/B1‐Zone wells 2008 Five‐Year Review Report submitted to the Water Board 2011 Indoor air investigation conducted in August 2011 to evaluate potential for vapor intrusion Five‐Year Review Report submitted to the Water Board Confirmation sampling conducted to evaluate Freon 113 and trichloroethene groundwater concentrations beneath the former Pad C excavation backfill 2014 Vapor intrusion evaluation completed for the Site Subsurface investigation conducted in September 2014 to better delineate the distribution of VOCs in the subsurface for planning future well installation related to property redevelopment 3

HALEY & ALDRICH, INC. \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\2_915 DeGuigne Drive\Deliverables\Five‐Year Report\2019_Five‐Year Review Report\2_tables\2019_01_HAI_Five‐Year Report Tables_915 DeGuigne.xlsx JANUARY 2019 TABLE 1 Page 2 of 2 SITE CHRONOLOGY1 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

Year Activity Began decommissioning of Site monitoring wells and installing new monitoring and extraction wells to facilitate 2015 property redevelopment3 Shallow soil investigation at the former PG&E substation3 Additional soil remediation completed near the former Pad IV area during building demolition and excavation activities associated with property redevelopment Began groundwater monitoring of new monitoring wells on a quarterly basis 2016 Continued decommissioning existing monitoring and extraction wells, and installation of replacement monitoring wells, to facilitate property redevelopment3 Replacement GETS installed and began operation and original GETS decommissioned 3 Soil vapor sampling conducted to evaluate potential for vapor intrusion in the new residences 3 Continued installation of replacement monitoring wells to facilitate property redevelopment 3 Excavation of soil at the former PG&E substation containing residual total petroleum hydrocarbons in the 2017 diesel range3 Begin construction of new residential buildings, including installation of vapor barriers and sub‐slab ventilation systems3 Sub‐barrier vapor samples collected after building construction completed3 2018 Continued installation of replacement monitoring wells to facilitate property redevelopment 3

Notes 1. Site activities from 1981 through 2000 are compiled from the Five‐Year report submitted by Arcadis in 2001. 2. Site activities from 2001 through 2008 are compiled from the Five‐Year report submitted by AMEC in 2008. 3. Site activities from 2009 through 2013 are compiled from the Five‐Year report submitted by Haley & Aldrich in 2014. 3. Activity conducted by others (e.g., consultants for the property owner).

HALEY & ALDRICH, INC. \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\2_915 DeGuigne Drive\Deliverables\Five‐Year Report\2019_Five‐Year Review Report\2_tables\2019_01_HAI_Five‐Year Report Tables_915 DeGuigne.xlsx JANUARY 2019 TABLE 2 Page 1 of 2 SUMMARY OF GROUNDWATER MONITORING DATA ‐ 2014 THROUGH 2018 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

2014 20152 20162 20172 2018 Maximum Water Level (A‐Zone well), feet msl 31.96 29.61 30.47 31.27 30.67 Minimum Water Level (A‐Zone well), feet msl 23.90 23.87 21.85 22.10 24.25 Maximum Water Level (B1‐Zone well), feet msl 32.02 29.69 30.56 31.56 30.43 Minimum Water Level (B1‐Zone well), feet msl 23.51 23.50 23.17 22.90 22.37 Maximum Water Level (B2‐Zone well), feet msl 27.43 26.18 28.13 28.91 29.61 Minimum Water Level (B2‐Zone well), feet msl 22.01 16.80 17.51 19.28 19.65 Water Level at 50‐DDD (B3‐Zone), feet msl 28.22 25.50 NA3 NA3 NA3

Number of A‐Zone Wells with VOCs > MCL 88 577 Number of B1‐Zone Wells with VOCs > MCL 55 274 Number of B2‐Zone Wells with VOCs > MCL 54 132

Maximum TCE Concentration (A‐Zone well), µg/L 130 110 140 84 90 Maximum TCE Concentration (B1‐Zone well), µg/L 170 53 160 130 82 Maximum TCE Concentration (B2‐Zone well), µg/L 150 140 160 47 37

Maximum cDCE Concentration (A‐Zone well), µg/L 75 98 110 65 62 Maximum cDCE Concentration (B1‐Zone well), µg/L 350 290 170 210 160 Maximum cDCE Concentration (B2‐Zone well), µg/L 350 140 1.3 71 37

Gallons Pumped, millions of gallons 39.8 31.8 20.5 9.6 7.2 Annual VOCs Removed, pounds 50 44 22 7.3 5.7 Pounds of VOCs/million gallons 1.3 1.4 1.1 0.76 0.80

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Notes 1. The original network of monitoring wells and extraction wells was modified between 2015 and 2017 to facilitate Site redevelopment. A consultant for the property owner decommissioned all basement dewatering sumps, nine extraction wells, and 15 monitoring wells included in the annual groundwater monitoring program, and installed 12 new extraction wellsw and 12 ne monitoring wells. 2. The original extraction well network, treatment system, and basement dewatering sumps operated until 8/15/2016, when the replacement extraction well network and treatment system began operation. 3. B3‐Zone monitoring well 50‐DDD was decommissioned in 2015/2016.

Abbreviations VOCs = volatile organic compounds. feet msl = feet above mean sea level TCE = trichloroethene MCL = maximum contaminant level cDCE = cis‐1,2‐dichloroethene µg/L = micrograms per liter

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Volume Average Estimated Total Mechanism Extracted Influent VOCs VOCs Removed (gallons) (µg/L) (pounds) 1982/1983 Excavations NA NA 159 2 Groundwater Extraction 1984 through 1996 477,463,020 3 1,091 3 4,331 Groundwater Extraction 1997 31,160,950 457 119 1998 26,785,990 384 85 1999 27,000,040 504 115 2000 27,590,000 477 110 2001 34,394,080 381 109 2002 37,239,480 323 99 2003 34,654,860 315 90 2004 30,208,790 264 66 2005 35,383,730 225 66 2006 27,312,510 233 53 2007 24,105,860 184 37 2008 30,090,510 183 46 2009 33,068,180 179 49 2010 27,947,860 168 39 2011 29,739,482 165 41 2012 32,947,600 180 51 2013 34,340,400 173 49 2014 39,791,600 153 50 20154 31,811,217 168 44 20165 20,451,425 129 22 2017 9,616,340 93 7.3 2018 7,201,920 92 5.7 Total 1,110,305,844 560 5,844

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Notes 1. The extraction volumes shown above for 1997 through 2000 (and associated VOC mass removed) are based on meter readings for individual extraction wells. The extraction volumes for 2001 through 2011 (and associated VOC mass removed) are based on readings taken from the Santa Clara Valley Water District totalizer that measures the combined influent from the nine on‐site extraction wells located on the AMD 915 DeGuigne facility (does not include the volume extracted by Basement Sump 6). The extraction volumes for 2012 through 2018 (and associated VOC mass removed) are based on readings taken from the Santa Clara Valley Water District totalizer that measures the effluent from the treatment system, and includes the basement dewatering sumps when the sumps were operating.

2. Approximately 151 pounds of trichlorobenzene were excavated in 1982/1983 and are included in this VOC estimate. 3. Estimated value. 3. Basement dewatering sumps 1‐4 ceased operation in July 2015 to facilitate Site redevelopment. 4. The original extraction well network, treatment system, and basement dewatering sump 6 operated until 8/15/2016, when the replacement extraction well network and treatment system began operation.

Abbreviations µg/L = micrograms per liter NA = not available VOCs = volatile organic compounds

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Volume Estimated Total VOC Removal Cost Per Pound Extracted VOCs Removed Annual Cost1 Efficiency of VOCs Removed Year (gallons) (pounds) (USD) (pounds / Mgal) (USD) 1997 31,160,950 119 $107,000 3.8 $899 1998 26,785,990 85 $151,000 3.2 $1,776 1999 27,000,040 115 $92,000 4.3 $799 2000 27,590,000 110 $85,000 4.0 $773 2001 34,394,080 109 $107,000 3.2 $978 2002 37,239,480 99 $76,000 2.7 $768 2003 34,654,860 90 $93,000 2.6 $1,033 2004 30,208,790 66 $87,000 2.2 $1,318 2005 35,383,730 66 $139,000 1.9 $2,106 2006 27,312,510 53 $93,000 1.9 $1,755 2007 24,105,860 37 $112,000 1.5 $3,027 2008 30,090,510 46 $112,000 1.5 $2,435 2009 33,068,180 49 $63,000 1.5 $1,286 2010 27,947,860 39 $72,000 1.4 $1,846 2011 29,739,482 41 $144,000 1.4 $3,512 20122 32,947,600 51 $189,000 1.5 $3,706 20132 34,340,400 49 $253,000 1.4 $5,153 2014 39,791,600 50 $225,000 1.3 $4,500 20153 31,811,217 44 $238,000 1.4 $5,462 20164 20,451,425 22 $211,000 1.1 $9,420 2017 9,616,340 7.3 $145,000 0.8 $19,886 2018 7,201,920 5.7 $165,000 0.8 $28,698 TOTAL 523,970,322 1,225 $2,959,000 2.35 $2,416.30

Notes 1. Costs include operation and maintenance and associated groundwater pumping fees. Values are rounded to the nearest thousand dollars. 2. Estimated cost for 2012 and 2013. 3. Basement dewatering sumps 1‐4 ceased operation in July 2015 to facilitate Site redevelopment. 4. The original extraction well network, treatment system, and basement dewatering sump 6 operated until 8/15/2016, when the replacement extraction well network and treatment system began operation.

Abbreviations Mgal = million gallons of water USD = United States dollars VOCs = volatile organic compounds

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38-S T-16A 33.78 33.89 A@ A@ A@ NMW-09 S025A A@ T-15A 32.95* T-17A 34.08 31.60 S135A S152A 34.24 T-8A 34 33.95 S151A 34.27 T-25A A@ 33.14 A@ A@ 34.44 @ A@ [email protected] A@ A@ A@A@A@ A@ A ED S092A T-19A ED S005A T-23A S048A S101A ED T-13A 34.39 S043A 33.34 S100A 34.90 34.25 34.59 32.57 A@ T-14A A@ 34.47 [ S139A S080A S079A NMW-12B 36.59 36.11 37-S T-7A 36-S 33.89* A@ S141A S049A S138A A@ 34.94 A@ 35.95 35.48 35.46 35.09 S137A A@ A@ A@ A@ 35 S028A STEWART DR 36 36.82 A@ A@ A@ S081A A@EDEDED 37.23 S083A ED ED ED S136A S090A A@ 36.75 ED 37.53 S027A 36.50 A@ A@ 36 NM S146A A@ A@ S082A 37.14 S140A X2A S145A S007A 38.34 38.04 S006A S024A 37.22 37 S142A 38.57 A@ A@ A@ 22-S A@ 16-S A@ A@ 37.39 38.34 A@ 28-MW 23-S A@ A@A 37.87 28-S 38.30 NMW-05 DW-2 38.09 38 38.24 @35.77* A NMW-03 35.16* A@

THOMPSON PL

39

A@ 40 27-S NMW-06 40.45 [email protected]* 41 29-S 40.99 S001A A@ 41.85 @ A 42

43

44 A@ NMW-07 A@ 38.87* S157A 15-S A@ NMW-01 42.13 J L r NM 44.26 A@ 0 200 400 E ARQUES AVE

SANTA ANA CT SCALE IN FEET

A@ MONITORING WELL NOTES FORMER 915 DEGUIGNE DRIVE ED EXTRACTION WELL 1. *MOHAWK WELLS ARE SURVEYED TO A DIFFERENT VERTICAL DATUM H81::~ICH SUNNYVALE, CALIFORNIA (NGVD29), AND ARE OFFSET BY APPROXIMATELY 2.7 FEET. THE DISPLAYED GROUNDWATER ELEVATION CONTOUR, IN FEET DATA HAVE BEEN ADJUSTED ACCORDINGLY. APPROXIMATE DIRECTION OF HYDRAULIC 2. CONTOURS ARE BASED ON INTERPRETATION OF MONITORING-WELL DATA GRADIENT AND CURRENT UNDERSTANDING OF HYDROGEOLOGIC CONDITIONS. THEY ARE PROVIDED FOR CLARITY AND ARE NOT INTENDED TO IMPLY CERTAINTY. SITE BOUNDARY 3. NM = NOT MEASURED A-ZONE WATER LEVELS OCTOBER 2018 BUILDING FOOTPRINT

FORMER BUILDING FOOTPRINT IZZI SCALE: AS SHOWN JANUARY 2019 FIGURE 4 \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\1_Former 901-902 Thomspon 1:10:19 PM 1/16/2019 ajospe -- -- Place\GIS\2019-01\127839_004_00MB_915_ANNUAL_REPORT_2018.mxd R

D

N

A

AVE

AVE

AVE U

WAY SANTA

J

PAULA AVE PAULA

N PEDROSAN

SANMIGUEL

SANPATRICIO A SANLUISITO Jl J S ______,, l~~J l 52-D ----E DUANE AVE COM10B1H COM34B1 COM06B1H 24.43 22.32 26.89 24.33 COM31B1 EW-11 ED A@ @ A@ EW-20 ED ED ED ) A@ED A@ 24 A@ A A@ A@ EW-21 EW-15 A@ 23 COM07B1 COM32B1 19-D COM09B1 24.30 COM29B1 23.22 26.88 25 25.73 25 29.53 A@ 25 10-D NM 26 S076B1 A@ S072B1 25.25 56-D 28.26 26 (22.37) 28 A@ A@

27 40-D 28.47 A@

29 FORMER 915 DEGUIGNE S077B1 30.59 S075B1 DRIVE 29.54 49-DR A@ A@ (28.96) DEGUIGNE DR A@ 57-D S073B1 A@ 30.43 30.41 30 A@

FORMER SUBMICRON DEVELOPMENT CENTER 31 S067B1 41-D 31.65 NM A@ A@

S074B1 32.46 32 A@

S071B1 32.06 A@ A@ T-9B 32.16

T-4B T-10B 33.19 33.94 33 33 A@ A@ S154B1 S147B1 T-17B EDA@ED S065B1 34.31 T-19B I# 31.89 A@ @ T-8B 36.05 S025B1 A@ED S101B1 A 34.42 A@ 29.39 PZ034B1 32.80 S148B1 A@ ED S100B1 I# ED ED S005B1 S048B1 S149B1 34.48 PZ077B1 33.18 34.30 A@ 34

S153B1 S080B1 35 36.30 35.78 T-5B T-7B T-18B A@ A@ 34.32 36.78 36.68 A@ A@ A@ 36 A@ ~ 36-D '-----.../ '------__) 35.52 STEWART DR S028B1 A@ S049B1 36.93 A@ 40.04 A@ D S111B1 ~~ □ □ h~~ ED S141B1 36.54 S027B1 37 36.06 I S133B1 A@ 41.28 A@ DW-7 (39.24) 38 X2B1 S024B1 38.72 X1B 38.25 PMW-2-1 38.65 A@ 38.76 A@ PMW-1-3 23-D A@A@ 39.04 D I (40.63) A@A@A@ PMW-1-2 ~ I 39 A@ 38.92 PMW-2-2 PMW-1-1 40 39.47 38.47 28-D DW-1 38.27 (38.74) A@ 52-D 39.35 41 THOMPSON PL

27-D 40.98 42 A@

43 29-D 41.14 S001B1 A@ 45.31 44 A@ 45

53-D 43.96 S157B1 A@ (42.12) DC]£ A@

0 200 400 E ARQUES AVE

SANTA ANA CT SCALE IN FEET A@ MONITORING WELL

I# PIEZOMETER NOTES FORMER 915 DEGUIGNE DRIVE ED EXTRACTION WELL 1. WATER LEVELS IN PARENTHESIS, E.G., (40.09), WERE NOT USED IN H81::~ICH SUNNYVALE, CALIFORNIA GENERATING CONTOURS. GROUNDWATER ELEVATION CONTOUR, IN FEET 2. CONTOURS ARE BASED ON INTERPRETATION OF MONITORING-WELL DATA APPROXIMATE DIRECTION OF HYDRAULIC AND CURRENT UNDERSTANDING OF HYDROGEOLOGIC CONDITIONS. THEY GRADIENT ARE PROVIDED FOR CLARITY AND ARE NOT INTENDED TO IMPLY CERTAINTY. 3. NM = NOT MEASURED SITE BOUNDARY B1-ZONE WATER LEVELS OCTOBER 2018 BUILDING FOOTPRINT

FORMER BUILDING FOOTPRINT SCALE: AS SHOWN JANUARY 2019 FIGURE 5 \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\1_Former 901-902 Thomspon 1:10:19 PM 1/16/2019 ajospe -- -- Place\GIS\2019-01\127839_004_00MB_915_ANNUAL_REPORT_2018.mxd A@ R

D 45-DD

N 27.20

A

AVE

U AVE

AVE WAY

SANTA

J

PAULA AVE PAULA N J · l_ Jl~Jl~PEDROSAN

SANMIGUEL

A SANLUISITO l__ SANPATRICIO J S '----~~~ COM08B2 E DUANE AVE 24.89 COM18B2H A@ COM21B2H 53-DD A@ A@ A@ 24.02 ED A@ ED ED EW-14 l 29.61 A@ NM 54-DD COM08B2EH COM06B2 EW-10 24.90 20 19.65 22 21 23 24 25 A@ 56-DD Do 25.68 26

27

FORMER 915 DEGUIGNE 28 DRIVE A@ A@ 57-DD DEGUIGNE DR 49-DD 28.20 29 29.61 COM15B2 28.48 A@ FORMER SUBMICRON DEVELOPMENT CENTER 30

31

32

T-10C T-11C 32.25 32.90 A@ A@

33

34 PZ034B2 ' I#(29.47) ED 35 S154B2 S048B2 A@ T-12C PZ077B2 ED 35.65 I#(33.84)

36 [

36-DD 36.57 I_j A@ "---~- STEWART DR L 37 38 I 39

40 22-DD 40.69 A@ D A@ PMW-2-3 I 40.26

41

42 THOMPSON PL

27-DD 43 43.38A@

C7_L____-~J L___l___~- 11 r 0 200 400 E ARQUES AVE

SANTA ANA CT SCALE IN FEET A@ MONITORING WELL

I# PIEZOMETER NOTES FORMER 915 DEGUIGNE DRIVE ED EXTRACTION WELL 1. WATER LEVELS IN PARENTHESIS, E.G., (25.15), WERE NOT USED IN H81::~ICH SUNNYVALE, CALIFORNIA GENERATING CONTOURS. GROUNDWATER ELEVATION CONTOUR, IN FEET 2. CONTOURS ARE BASED ON INTERPRETATION OF MONITORING-WELL DATA APPROXIMATE DIRECTION OF HYDRAULIC AND CURRENT UNDERSTANDING OF HYDROGEOLOGIC CONDITIONS. THEY GRADIENT ARE PROVIDED FOR CLARITY AND ARE NOT INTENDED TO IMPLY CERTAINTY. 3. NM = NOT MEASURED SITE BOUNDARY B2-ZONE WATER LEVELS OCTOBER 2018 BUILDING FOOTPRINT

FORMER BUILDING FOOTPRINT IZZI SCALE: AS SHOWN JANUARY 2019 FIGURE 6 \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\1_Former 901-902 Thomspon 1:10:19 PM 1/16/2019 ajospe -- -- Place\GIS\2019-01\127839_004_00MB_915_ANNUAL_REPORT_2018.mxd 54-S 53-S 10,000 10,000 LEGEND 54-DD1,000 1,000 A@ A-ZO NEMO NITO RINGWELL 53-S 100 100 APPRO X IMATEEXTENT OF EXCAVATION ATFO RMERPAD C

SANTA PAULA AVE PAULA SANTA SAN MIGUEL AVE MIGUEL SAN .. ACIDNEUTRALIZATION SYSTEM "'· AVE PATRICIO SAN • WAY LUISITO SAN I I ... 10 > 10 E DUANE AVE (µg/L) entration Conc I IBUILDING FO O TPRINT Conc entration (µg/L) entration Conc ------1 1 A@ 53-S 19-S A@ A@ FO RMERAMD DEGUIGNE915 DRIVE BUILDING A@ 54-S 55-S V/21 ND0.1 ' I l'I 'I' I' ' I ---1 ND0.1 I 111 I I L __ SITEBO UNDARY l'I 'I' I I '' I I 2-S A@ 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020

1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Sam p lingDate GRAPHLEGEND Sam p lingDate # TRICHLO RO ETHENE(TCE) 55-S 10,000 2-S 56-S " c is-1,2-DICHLORO ETHENE(cDCE) 10,000 A@ 1,000 55-S CLEANUPGO ALFO RTCE 1,000 2-S 19-S . 10,000 19-S . 100 ...... CLEANUPGO FO AL RcDCE 100 40-S A@ 1,000 ■ •••••••••. . 10 .. 10 Conc entration (µg/L) entration Conc 100 Conc entration (µg/L) entration Conc "i· ...... :: 1 1 . . 10 . . ND0.1

Conc entration (µg/L) entration Conc .. ND0.1 I I' ' 'I ~ I' • , 'I I' 1 DEG1982 U1984 IG1986 N1988 E1990 1992 D1994 R1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 57-S Sam p lingDate Sam p lingDate A@ ND0.1 A@49-S 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Sam p lingDate NOTES

1. ALLLO 1. CATIONSAND DIMENSIONS ARE APPRO X IMATE.

2. ONLY 2. ACTIVE MO NITO RINGWELLS ARE SHO WN.MO NITO RING WELLSTHAT WERE DECO MMISSIONEDDURING THE 2014-2018REVIEW PERIODARE NO SHO T WN.

56-S 10,000 41-S A@ 1,000 FORMER AMD 915 DEGUIGNE DRIVE 100

49-S 57-S 40-S 56-S .. 41-S 10,000 10,000 10 10,000 10,000 Conc entration (µg/L) entration Conc 1,000 49-S 1,000 57-S 1 41-S1,000 1,000 40-St: ~ - ■ ••• •...... ■ 0 160 320 ...... ~~11-...... • ...... ••: ...... ■ .., · 100 100 ND0.1 ' I l'I 'I' I' ' I SCALEFEETIN ... • ... •• ■ ■ .... 100 100 'lii-. .... ••• •• ■ ...... 7:i ...... ••• ■ ...... ■ ...... ■ ■

. .. 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 t • •• _J 10 10 ■ ••••• ■ •• Sam p lingDate 10 ■ ...... 10 · . .. (µg/L) entration Conc (µg/L) entration Conc Conc entration (µg/L) entration Conc Conc entration (µg/L) entration Conc . . . .. 1 1 1 1 . .. .. DEGUIGNE915 DRIVE SUNNY VALE,CALIFO RNIA ND0.1 jl I 11 I 11 I 11 j jl I ND0.1 ~ ~ ICH ND0.1 'I' l'I 'I' l'I 'I I I " 'I" ND0.1 I I" 'I I I " 'I 11 I 11 j l I 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020

1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Sam p lingDate Sam p lingDate Sam p lingDate Sam p lingDate CO NCENTRATIONTRENDS FO R = u A-ZO NEMO NITO RINGWELLS

JANUARY2019 FIGURE7 GIS FILE PATH: \\ha leya ldrich.com \sha re\oa k_ c om m on\Advanc ed Micro Devices\2_915 DeGuigne Drive\GLOBAL\GIS\MX Ds\2018_12\127819_004_0004_A-ZO NE_CO NCENTRATION_TRENDS.mxd ― USER: ajospe ― LAST SAVED: 12/19/2018 3:29:24 PM 3:29:24 12/19/2018 SAVED: LAST ― ajospe USER: ― NCENTRATION_TRENDS.mxd NE_CO Ds\2018_12\127819_004_0004_A-ZO Drive\GLOBAL\GIS\MX DeGuigne Devices\2_915 Micro k_ c ed om m on\Advanc re\oa \sha ldrich.com leya \\ha PATH: FILE GIS LEGEND 10-D 10,000 A@ B1-ZO NEMO NITO RINGWELL

APPRO X IMATEEXTENT OF EXCAVATION ATFO RMERPAD C 1,000 52-D ACIDNEUTRALIZATION SYSTEM

10,000 AVE PEDRO SAN

SANTA PAULA AVE PAULA SANTA ...... AVE MIGUEL SAN SAN PATRICIO AVE PATRICIO SAN ...... WAY LUISITO SAN 100 ...... - ...... ~ . ... BUILDINGFO O TPRINT ::::...... I I ... ~ .. 10-D E DUANE AVE 1,000 10 - i:, 52-D FO RMERAMD DEGUIGNE915 DRIVE BUILDING @ ------VZ21

Conc entration (µg/L) entration Conc A 19-D 100 19-D SITEBO UNDARY 1 A@ [= I 10-D 10 GRAPHLEGEND

ND0.1 A@ (µg/L) entration Conc ■ TRICHLO RO ETHENE(TCE) 1 #

1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 • ■ Sam p lingDate " c is-1,2-DICHLORO ETHENE(cDCE) ND0.1 'I I 'I I' I I 'I 'I I I' I' 56-D A@ CLEANUPGO ALFO RTCE 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 40-D Sam p lingDate 10,000 CLEANUPGO FO AL RcDCE

40-D 19-D 1,000 A@ 10,000 I

100 40-D 1,000 19-D

10 - 100 J. Conc entration (µg/L) entration Conc - ...... GUIGNE DR 1 ; ... b DE ••11•• • .······· ...... 57-D 10 .. • ■. A@ ■ • 49-DR (µg/L) entration Conc . .. ND0.1 A@ ·: ... 1 . NOTES 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Sam p lingDate ND0.1 ALLLO 1. CATIONSAND DIMENSIONS ARE APPRO X IMATE.

2. ONLY 2. ACTIVE MO NITO RINGWELLS ARE SHO WN.MO NITO RING 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 f Sam p lingDate WELLSTHAT WERE DECO MMISSIONEDDURING THE 2014-2018REVIEW PERIODARE NO SHO T WN.

3. WELL 3. WAS49-D REPLACED BY WELL 2018.49-DRIN 56-D 10,000 -

1,000 - 41-D A@ DD 56-D100 I FORMER AMD - 915 DEGUIGNE DRIVE I 10

41-D 49-DR 57-D (µg/L) entration Conc 10,000 10,000 10,000 1 . 0 160 320 t"- 1,000 1,000 1,000 SCALEFEETIN = .!,,./J,.i,.•~ •• ND0.1 - ...... • -t..... • • ' I I ' I I ' I I ' I ' I I I ' I' 41-D 49-DR 57-D - ,...... : ...... : ..• :•... •:•

100 100 100 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 - \■•• ••••••• ... · ~ ... .. Sam p lingDate 915 DEGUIGNE915 DRIVE 10 ■ •■ 10 10 ...... SUNNY VALE,CALIFO RNIA Conc entration (µg/L) entration Conc (µg/L) entration Conc Conc entration (µg/L) entration Conc ••··•·•·• . ~ ~ ICH 1 1 1 ■ CO NCENTRATIONTRENDS FO R ND0.1 ND0.1 ND0.1 'I I I I' I' 'I 'I I I' I B1-ZO NEMO NITO RINGWELLS 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 IL____I Sam p lingDate Sam p lingDate Sam p lingDate JANUARY2019 FIGURE8 GIS FILE PATH: \\ha leya ldrich.com \sha re\oa k_ c om m on\Advanc ed Micro Devices\2_915 DeGuigne Drive\GLOBAL\GIS\MX Ds\2018_12\127819_004_0005_B-ZO NE_CO NCENTRATION_TRENDS - Cop y.mxd ― USER: ajospe ― LAST SAVED: 12/14/2018 1:18:21 PM 1:18:21 12/14/2018 SAVED: LAST ― ajospe USER: ― y.mxd Cop - NCENTRATION_TRENDS NE_CO Ds\2018_12\127819_004_0005_B-ZO Drive\GLOBAL\GIS\MX DeGuigne Devices\2_915 Micro k_ c ed om m on\Advanc re\oa \sha ldrich.com leya \\ha PATH: FILE GIS 53-DD LEGEND 10,000 45-DD 10,000 A@ B2-ZO NEMO NITO RINGWELL 1,000 45-DD 1,000 APPRO X IMATEEXTENT OF EXCAVATION ATFO RMERPAD C

SAN PATRICIO AVE A@PATRICIO SAN ,. IACID NEUTRALIZATION SYSTEM

SAN PEDRO AVE PEDRO SAN 100 AVE PAULA SANTA

SAN MIGUEL AVE MIGUEL SAN SAN LUISITO WAY LUISITO SAN 100 I IBUILDING FO O TPRINT 10 45-DD FO RMERAMD DEGUIGNE915 DRIVE BUILDING E DUANE AVE 10 Conc entration (µg/L) entration Conc VZ21

Conc entration (µg/L) entration Conc ... t ... ■ 1 ------SITEBO UNDARY ------A@ 1 ... . ' .... [= I A@ 53-DD 54-DD . ... GRAPHLEGEND ND0.1 53-DD ND0.1 # TRICHLO RO ETHENE(TCE) 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020

Sam p lingDate 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Sam p lingDate " c is-1,2-DICHLORO ETHENE(cDCE)

CLEANUPGO ALFO RTCE A@56-DD 54-DD CLEANUPGO FO AL RcDCE 10,000

D1,000

54-DD100

10 Conc entration (µg/L) entration Conc .. 1 DEGUIGNE DR . 57-DD ••• 49-DD A@ A@ ND0.1 NOTES

/ 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 ALLLO 1. CATIONSAND DIMENSIONS ARE APPRO X IMATE. / Sam p lingDate 2. ONLY 2. ACTIVE MO NITO RINGWELLS ARE SHO WN.MO NITO RING WELLSTHAT WERE DECO MMISSIONEDDURING THE 2014-2018REVIEW r <::> //// PERIODARE NO SHO T WN. 56-DD 10,000 -

56-DD 1,000 -

100 - • ■ 57-DD 57-DD ■ 49-DD 10,000 - 10 . I - 10,000 FORMER AMD - - - Conc entration (µg/L) entration Conc - - - 915 DEGUIGNE DRIVE 1,000 - 1 - =- - 1,000 - 0 160 320

100 ND0.1 I 'I I 'I I' I I 'I 'I I I' I' SCALEFEETIN 100 49-DD -

uuo□ 10 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 I 10 □ / Sam p lingDate Conc entration (µg/L) entration Conc Conc entration (µg/L) entration Conc 1 . DEGUIGNE915 DRIVE = ■ 1 .. . . SUNNY VALE,CALIFO RNIA ■ ~ ~ ICH ND0.1 ND0.1 I I I ""r'!"' - ~-, ~,~--■ --~-~,--■■■,-,~

1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 CO NCENTRATIONTRENDS FO R 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 = Sam p lingDate Sam p lingDate B2-ZO NEMO NITO RINGWELLS

JANUARY2019 FIGURE9

GIS FILE PATH: \\ha leya ldrich.com \sha re\oa k_ c om m on\Advanc ed Micro Devices\2_915 DeGuigne Drive\GLOBAL\GIS\MX Ds\2018_12\127819_004_0006_B2-ZO NE_CO NCENTRATION_TRENDS.mxd ― USER: ajospe ― LAST SAVED: 12/19/2018 3:27:38 PM 3:27:38 12/19/2018 SAVED: LAST ― ajospe USER: ― NCENTRATION_TRENDS.mxd NE_CO Ds\2018_12\127819_004_0006_B2-ZO Drive\GLOBAL\GIS\MX DeGuigne Devices\2_915 Micro k_ c ed om m on\Advanc re\oa \sha ldrich.com leya \\ha PATH: FILE GIS = en -C: 0 co C) 4 C: .Q .E .... Q) a. en 3 "O C: :::, 0 ...... a. ~ C: Q) ·c3 2 iE w co > 0 E Q) 0:: 1 en en co ~

1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Year

915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

MASS REMOVAL EFFICIENCY 1997 - 2018

JANUARY 2019 FIGURE 10

APPENDIX A

Historical Water Level Data

HISTORICAL GROUNDWATER ELEVATION DATA Page 1 of 5 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

WELL MONITORING EVENT ID Jun‐87 Aug‐87 Nov‐87 Mar‐88 Jun‐88 Sep‐88 Dec‐88 Mar‐89 Jun‐89 Oct‐89 Jan‐90 Apr‐90 A‐Aquifer Wells 1‐S 22.99 22.82 22.44 22.33 21.93 21.42 20.97 20.72 20.07 19.15 DRY 18.87 2‐S 34.95 34.95 22.29 DRY DRY DRY DRY DRY DRY DRY DRY DRY 3‐S 24.60 24.52 24.21 23.77 23.90 DRY 37.71 37.71 DRY DRY DRY DRY 4‐S 25.32 36.12 25.25 DRY DRY DRY AB AB AB AB AB AB 8‐S 20.11 20.08 20.01 18.50 18.72 DRY DRY DRY DRY DRY DRY DRY II 9‐S 26.04 25.49 25.54 DRY DRY DRY AB AB AB AB AB AB 11‐S 21.14 21.02 19.90 19.44 DRY DRY DRY DRY DRY DRY DRY DRY 12‐S 23.54 23.40 22.88 22.76 22.51 22.05 21.59 21.66 19.95 16.12 18.55 20.25 18‐S 20.43 20.92 19.23 19.07 DRY DRY DRY DRY DRY DRY DRY DRY 19‐S 34.70 34.70 34.70 DRY DRY DRY DRY DRY DRY DRY DRY DRY 24‐S 33.85 20.90 33.85 DRY DRY DRY DRY DRY DRY DRY DRY DRY 31‐S 20.42 20.93 31.20 21.61 DRY DRY DRY DRY DRY DRY DRY DRY 40‐S 23.79 23.72 23.69 23.27 24.01 24.10 24.24 24.20 23.89 24.19 24.15 24.30 41‐S 26.11 25.09 25.46 25.31 24.22 23.73 23.78 23.37 23.17 DRY DRY DRY 49‐S NI NI NI NI NI NI 20.14 19.49 19.95 19.59 19.10 19.19 53‐S NI NI NI NI NI NI NI NI NI NI NI NI 54‐S NI NI NI NI NI NI NI NI NI NI NI NI 55‐S NI NI NI NI NI NI NI NI NI NI NI NI 56‐S NI NI NI NI NI NI NI NI NI NI NI NI 57‐S NI NI NI NI NI NI NI NI NI NI NI NI A/B1‐Aquifer Wells 6‐S/D 16.95 16.90 16.37 15.06 15.49 15.08 15.11 14.77 14.42 13.75 13.44 13.69 7‐S/D 18.06 17.98 17.52 16.71 16.63 16.34 16.34 16.24 15.39 14.87 14.58 14.62 B1‐Aquifer Wells 9‐D 26.08 25.02 24.90 25.25 18.55 21.48 AB AB AB AB AB AB 10‐D 21.23 20.97 20.37 20.31 19.54 19.11 18.68 18.57 17.18 16.08 15.41 15.50 19‐D 17.16 17.02 16.41 15.84 15.55 15.30 15.18 15.18 14.44 13.88 13.43 13.46 20‐D 18.11 35.39* 17.54 16.73 16.59 16.24 16.17 16.10 15.24 14.74 14.45 14.47 24‐D 20.92 16.70 20.06 15.76 18.16 17.39 17.04 16.57 15.23 14.18 13.78 14.02 31‐D 21.64 20.98 19.53 21.42 18.90 18.21 20.49 17.36 17.46 16.01 15.41 15.88 40‐D 22.66 22.15 22.11 21.64 21.23 20.94 20.73 20.60 19.53 19.10 18.87 18.79 41‐D 26.15 24.35 25.52 25.35 24.24 23.78 23.80 23.36 23.21 NM NM NM 49‐D NI NI NI NI NI NI 17.09 19.31 19.39 18.71 18.35 18.44 51‐D NI NI NI NI NI NI NI NI NI 17.53 17.07 17.54 52‐D NI NI NI NI NI NI NI NI NI NI NI NI 56‐D NI NI NI NI NI NI NI NI NI NI NI NI 57‐D NI NI NI NI NI NI NI NI NI NI NI NI B2‐Aquifer Wells 11‐DD 21.64 20.45 ‐1.92* 18.64 18.12 17.21 18.09 15.38 17.26 14.40 13.89 14.80 18‐DD 21.45 18.99 ‐5.53* 13.26 12.56 11.56 17.28 17.07 16.31 8.42 8.28 8.58 20‐DD 19.34 18.41 ‐1.37* 16.70 15.98 15.35 15.61 14.44 14.64 13.40 13.05 13.50 32‐DD 21.64 20.45 18.53 15.00 13.95 12.40 15.72 10.67 14.33 10.35 10.63 11.28 42‐DD 21.45 18.99 13.46 13.28 13.72 12.65 13.25 10.63 12.01 9.34 9.49 3.26 43‐DD 19.34 18.41 17.04 14.41 12.92 11.69 11.53 10.23 10.06 8.82 8.53 9.95 44‐DD 18.41 17.79 16.90 16.80 16.13 15.04 17.34 12.63 16.49 12.20 11.99 12.73 45‐DD 19.87 17.79 15.83 18.19 17.49 16.47 16.31 14.81 15.73 13.35 13.19 13.90 49‐DD NI NI NI NI NI NI 17.71 14.66 14.77 13.34 23.02 23.91 53‐DD NI NI NI NI NI NI NI NI NI NI NI NI 54‐DD NI NI NI NI NI NI NI NI NI NI NI NI 56‐DD NI NI NI NI NI NI NI NI NI NI NI NI 57‐DD NI NI NI NI NI NI NI NI NI NI NI NI B3‐Aquifer Wells 50‐DDD NI NI NI NI NI NI NI NI NI 8.18 8.57 9.70 NOTES: Groundwater elevations reported in feet above mean sea level (USGS Datum) through NM Not measured 2004, and feet NAVD88 since 2005. Top of casing elevations were resurveyed in 2005, with the exception of the wells installed and surveyed in 2015 through 2018. Groundwater elevations Groundwater elevations measured during subsequent monitoring events were calculated using resurveyed elevations. * Water Level measurement is believed to be inaccurate. NI Well not installed. DRY Water level was below bottom of casing. - Well Closed In Place

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WELL MONITORING EVENT ID Jul‐90 Oct‐90 Jan‐91 Apr‐91 Jul‐91 Oct‐91 Jan‐92 Apr‐92 Jul‐92 Oct‐92 Jan‐93 Apr‐93 A‐Aquifer Wells 1‐S DRY DRY DRY 20.02 20.22 19.61 19.29 21.94 21.27 DRY 21.20 23.62 2‐S DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY 3‐S DRY DRY DRY DRY DRY DRY 22.27 24.28 23.19 24.18 25.16 25.21 4‐S AB AB AB AB AB AB AB AB AB AB AB AB 8‐S DRY DRY DRY DRY DRY DRY 18.20 20.16 DRY DRY 20.02 21.42 II 9‐S AB AB AB AB AB AB AB AB AB AB AB AB 11‐S DRY DRY DRY DRY DRY DRY DRY 19.90 DRY DRY DRY DRY 12‐S 19.89 17.51 21.82 22.34 22.29 20.29 20.53 22.61 22.40 22.30 DRY 24.05 18‐S DRY DRY 23.19 DRY DRY DRY DRY DRY DRY DRY DRY DRY 19‐S DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY 24‐S DRY DRY DRY DRY DRY DRY 21.15 DRY DRY DRY DRY DRY 31‐S DRY DRY DRY DRY DRY DRY DRY 20.34 19.72 19.98 19.87 21.46 40‐S 23.99 24.18 24.08 23.85 24.16 24.05 23.86 23.82 23.70 23.51 23.71 24.18 41‐S DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY 23.42 49‐S 18.81 18.85 19.06 19.88 19.72 19.36 19.71 21.26 21.08 21.79 21.36 22.86 53‐S NI NI NI NI NI NI NI NI NI NI NI NI 54‐S NI NI NI NI NI NI NI NI NI NI NI NI 55‐S NI NI NI NI NI NI NI NI NI NI NI NI 56‐S NI NI NI NI NI NI NI NI NI NI NI NI 57‐S NI NI NI NI NI NI NI NI NI NI NI NI A/B1‐Aquifer Wells 6‐S/D 13.44 14.00 15.27 16.15 16.17 15.79 16.57 18.57 18.05 18.51 18.19 19.89 7‐S/D 14.32 14.53 15.86 16.75 16.80 16.46 17.34 19.23 18.80 19.34 18.97 20.67 B1‐Aquifer Wells 9‐D AB AB AB AB AB AB AB AB AB AB AB AB 10‐D 14.43 13.78 15.86 15.68 15.94 15.08 15.39 18.25 17.23 18.99 17.57 19.82 19‐D 12.52 12.91 14.70 15.40 15.58 14.91 15.81 17.70 17.08 17.58 17.33 19.02 20‐D 14.22 14.43 15.67 16.54 16.59 16.22 17.07 17.97 18.57 19.11 18.71 20.47 24‐D 13.29 13.42 14.51 15.38 15.28 14.56 15.26 17.51 16.56 17.61 16.49 18.91 31‐D 15.34 16.37 17.59 18.38 17.71 17.46 18.13 20.18 19.01 19.38 19.16 20.96 40‐D 18.40 18.57 18.61 19.11 18.89 18.69 19.13 20.48 19.79 21.13 20.21 22.01 41‐D 20.72 20.35 18.25 21.80 21.00 20.30 20.77 21.99 21.35 22.67 22.14 23.37 49‐D 17.87 17.98 18.37 19.34 18.96 18.52 19.07 20.74 19.36 21.27 20.38 22.14 51‐D 16.94 17.39 18.73 19.00 * 12.62 18.76 18.39 19.45 * 12.86 20.56 20.45 22.38 52‐D NI NI NI NI NI NI NI NI NI NI NI NI 56‐D NI NI NI NI NI NI NI NI NI NI NI NI 57‐D NI NI NI NI NI NI NI NI NI NI NI NI B2‐Aquifer Wells 11‐DD 14.19 15.87 17.27 17.93 17.64 16.83 17.63 19.66 17.86 17.67 17.47 15.19 18‐DD 7.85 15.07 16.85 15.76 15.25 14.92 15.80 17.09 12.69 14.38 13.86 15.16 20‐DD 12.99 13.94 15.55 16.13 16.10 15.44 16.30 18.34 17.40 18.08 16.96 19.26 32‐DD 10.89 13.53 17.68 14.27 17.21 13.60 14.99 16.48 13.84 15.56 15.35 16.10 42‐DD 9.73 8.24 14.68 14.41 14.14 11.80 13.77 16.29 14.40 16.08 12.50 15.74 43‐DD 8.76 10.36 12.74 13.63 12.69 11.60 12.79 15.28 13.41 14.65 9.90 14.69 44‐DD 11.99 15.35 16.79 16.95 16.63 15.96 16.77 18.85 15.99 16.84 16.37 17.57 45‐DD 13.27 14.34 15.88 17.47 16.60 15.61 16.49 19.03 16.87 16.80 16.77 19.47 49‐DD 12.91 14.66 15.68 16.61 15.85 14.79 15.94 18.19 16.97 18.94 14.42 17.69 53‐DD NI NI NI NI NI NI NI NI NI NI NI NI 54‐DD NI NI NI NI NI NI NI NI NI NI NI NI 56‐DD NI NI NI NI NI NI NI NI NI NI NI NI 57‐DD NI NI NI NI NI NI NI NI NI NI NI NI B3‐Aquifer Wells 50‐DDD 10.58 15.20 13.86 14.86 14.04 13.13 13.66 15.98 15.12 20.23 11.78 14.20 NOTES: All Groundwater Elevations Reported in Feet Above Mean Sea Level (USGS Datum). NM Not measured 2004, and feet NAVD88 since 2005. Top of casing elevations were resurveyed in 2005, with the exception of the wells installed and surveyed in 2015 through 2018. Groundwater elevatio Groundwater elevations measured during subsequent monitoring events were calculated using resurveyed elevations. * Water Level measurement is believed to be inaccurate. NI Well not installed. DRY Water level was below bottom of casing. - Well Closed In Place

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WELL MONITORING EVENT ID Jul‐93 Oct‐93 Jan‐94 Apr‐94 Jul‐94 Oct‐94 Jan‐95 Apr‐95 Jul‐95 Oct‐95 Apr‐96 Oct‐96 A‐Aquifer Wells 1‐S 22.47 DRY 21.83 22.12 21.98 21.70 21.85 24.17 22.66 22.16 23.46 21.96 2‐S DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY 3‐S 25.12 24.79 24.29 24.21 24.05 23.75 23.87 26.04 24.78 24.43 25.25 23.96 4‐S 21.58 8‐S 21.58 20.43 21.20 20.97 20.52 21.08 20.11 23.43 31.32 19.80 22.01 22.21 II 9‐S 11‐S DRY DRY DRY DRY DRY 20.97 DRY 21.00 DRY DRY 20.08 DRY 12‐S 23.29 DRY DRY DRY DRY DRY DRY 24.43 DRY DRY DRY DRY 18‐S DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY 19‐S DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY 24‐S DRY DRY DRY DRY DRY DRY 21.22 DRY DRY DRY DRY DRY 31‐S 20.88 20.55 20.08 20.28 20.46 21.44 19.94 21.62 20.62 20.15 21.16 19.97 40‐S 24.07 23.58 23.77 24.28 DRY 24.19 24.22 24.17 24.20 24.08 24.12 24.13 41‐S DRY DRY DRY 25.17 DRY 32.19 23.55 27.68 24.64 23.96 25.84 24.03 49‐S 22.25 21.76 21.55 21.59 21.66 23.13 21.45 24.25 22.08 21.89 23.00 21.85 53‐S NI NI NI NI NI NI NI NI NI NI NI NI 54‐S NI NI NI NI NI NI NI NI NI NI NI NI 55‐S NI NI NI NI NI NI NI NI NI NI NI NI 56‐S NI NI NI NI NI NI NI NI NI NI NI NI 57‐S NI NI NI NI NI NI NI NI NI NI NI NI A/B1‐Aquifer Wells 6‐S/D 19.46 18.69 18.42 18.61 18.58 21.62 17.06 19.02 17.71 17.40 18.42 17.31 7‐S/D 20.35 19.52 19.21 19.28 19.24 21.93 18.03 20.45 18.90 18.30 19.49 18.34 B1‐Aquifer Wells 9‐D 10‐D 18.74 18.06 17.29 17.74 17.89 18.44 17.27 21.50 19.39 17.47 19.75 17.72 19‐D 19.47 17.32 17.26 17.42 17.46 20.39 16.33 18.87 17.27 16.69 17.80 16.43 20‐D 20.05 19.02 18.95 19.05 19.02 21.55 17.96 20.43 18.85 18.21 19.43 18.28 24‐D 18.19 18.50 18.16 16.84 16.9 18.39 16.36 19.16 18.14 17.12 18.50 16.23 31‐D 19.99 19.52 19.05 19.41 19.49 21.35 19.20 21.33 20.35 19.59 20.81 19.20 40‐D 20.89 20.08 19.99 20.33 20.36 21.07 20.65 23.68 21.55 20.71 21.93 20.42 41‐D 22.52 21.92 21.85 25.69 22.51 32.24 23.68 27.76 24.77 24.05 25.99 24.16 49‐D 21.34 20.74 20.60 20.76 20.85 22.93 20.70 23.78 22.24 21.40 22.56 21.20 51‐D 21.40 20.87 20.56 20.76 20.86 21.80 17.71 19.80 21.64 20.30 22.34 18.87 52‐D NI NI NI NI NI NI NI NI NI NI NI NI 56‐D NI NI NI NI NI NI NI NI NI NI NI NI 57‐D NI NI NI NI NI NI NI NI NI NI NI NI B2‐Aquifer Wells 11‐DD 14.24 14.45 14.27 15.12 14.49 17.39 14.97 16.84 15.40 15.19 16.25 14.35 18‐DD 13.64 13.75 13.26 13.77 13.88 20.56 15.03 16.11 14.37 14.09 15.38 13.50 20‐DD 18.38 17.44 17.22 17.64 17.69 21.15 16.78 19.26 17.86 17.55 18.48 16.95 32‐DD 14.64 14.35 13.94 15.14 14.88 21.94 14.63 15.30 14.46 14.09 15.62 14.22 42‐DD 13.82 12.65 12.29 13.09 13.63 19.94 13.37 15.50 14.51 14.32 14.66 12.51 43‐DD 11.51 10.22 9.58 11.33 11.71 19.73 10.88 13.86 12.97 13.35 13.11 10.24 44‐DD 15.67 15.27 14.60 15.15 15.13 19.43 15.72 17.64 15.96 15.66 16.95 15.08 45‐DD 17.01 16.01 15.82 16.77 16.91 19.20 16.93 19.73 17.82 17.59 18.77 16.26 49‐DD 16.06 14.66 14.83 15.70 15.95 21.70 15.94 18.80 16.47 17.99 18.91 16.18 53‐DD NI NI NI NI NI NI NI NI NI NI NI NI 54‐DD NI NI NI NI NI NI NI NI NI NI NI NI 56‐DD NI NI NI NI NI NI NI NI NI NI NI NI 57‐DD NI NI NI NI NI NI NI NI NI NI NI NI B3‐Aquifer Wells 50‐DDD 14.72 11.30 12.79 12.99 12.78 19.98 14.36 17.63 16.48 15.62 17.84 15.38 NOTES: All Groundwater Elevations Reported in Feet Above Mean Sea Level (USGS Datum). c=JNM Not measured 2004, and feet NAVD88 since 2005. Top of casing elevations were resurveyed in 2005, with the exception of the wells installed and surveyed in 2015 through 2018. Groundwater elevatio Groundwater elevations measured during subsequent monitoring events were calculated using resurveyed elevations. NI Well not installed. DRY Water level was below bottom of casing. - Well Closed In Place

HALEY & ALDRICH, INC. \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\2_915 DeGuigne Drive\Deliverables\Five‐Year Report\2019_Five‐Year Review Report\4_appendix A‐historical water levels\915_Historical GW Elevation Data through 2018.xlsx JANUARY 2019 HISTORICAL GROUNDWATER ELEVATION DATA Page 4 of 5 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

WELL MONITORING EVENT ID Apr‐97 Oct‐97 Apr‐98 Oct‐98 Oct‐99 Oct‐00 Oct‐01 Oct‐02 Oct‐03 Oct‐04 Oct‐05 Oct‐06 A‐Aquifer Wells 1‐S 22.74 21.62 NM 22.38 21.96 22.10 22.12 21.97 22.37 22.56 25.52 25.95 2‐S DRY DRY 23.31 DRY DRY DRY DRY DRY DRY 22.10 25.22 25.20 3‐S 25.28 24.11 NM 24.86 24.47 24.30 24.51 24.77 25.03 35.89 28.92 28.70 4‐S 22.10 8‐S 22.10 19.86 NM 21.27 20.02 21.00 21.84 20.62 20.97 22.75 24.44 24.63 II 9‐S DRY 11‐S 20.06 DRY 21.61 19.44 DRY 19.45 19.39 19.35 20.36 22.29 24.03 24.86 12‐S DRY DRY NM DRY NM NM NM NM NM NM NM NM 18‐S DRY DRY 20.95 DRY DRY 18.95 19.30 18.84 19.63 21.74 23.67 24.71 19‐S DRY DRY DRY DRY DRY DRY DRY DRY DRY 21.63 23.14 24.35 24‐S DRY DRY NM DRY NM NM NM NM NM NM NM NM 31‐S 21.00 20.05 21.81 20.99 20.19 20.99 20.82 20.64 21.14 22.78 24.57 25.29 40‐S 23.56 DRY 24.07 23.15 22.88 DRY DRY 22.94 22.93 23.59 26.68 26.85 41‐S 25.54 24.93 27.57 25.45 25.18 24.41 25.82 26.36 27.11 26.94 30.90 30.71 49‐S 23.11 DRY NM 22.84 22.26 22.72 23.28 23.44 23.78 24.56 27.33 27.40 53‐S NI NI NI NI NI NI NI NI NI NI NI NI 54‐S NI NI NI NI NI NI NI NI NI NI NI NI 55‐S NI NI NI NI NI NI NI NI NI NI NI NI 56‐S NI NI NI NI NI NI NI NI NI NI NI NI 57‐S NI NI NI NI NI NI NI NI NI NI NI NI A/B1‐Aquifer Wells 6‐S/D 18.54 17.53 NM NM NM NM NM NM NM NM NM NM 7‐S/D 19.11 17.94 NM NM NM NM NM NM NM NM NM NM B1‐Aquifer Wells 9‐D 10‐D 20.34 18.94 23.27 19.90 19.44 19.31 20.44 20.80 20.94 22.02 25.09 25.20 19‐D 17.83 16.86 19.45 17.90 16.79 19.03 18.29 18.19 18.68 21.93 22.78 24.24 20‐D 19.52 17.30 NM 19.84 18.21 20.37 19.75 19.55 19.94 22.63 23.82 24.61 24‐D 18.93 16.81 NM 19.10 NM NM NM NM NM NM NM NM 31‐D 20.68 19.77 NM NM NM NM NM NM NM NM NM NM 40‐D 22.05 20.52 24.09 21.37 21.03 21.02 22.13 22.46 22.67 23.57 26.75 26.78 41‐D 25.60 24.96 28.55 25.54 25.22 24.45 25.9 26.42 27.18 27.02 30.93 30.77 49‐D 22.88 21.81 NM 22.70 22.14 22.25 22.88 23.43 23.84 24.66 27.41 27.32 51‐D 22.17 21.17 23.25 22.10 22.6 22.16 22.01 22.04 23.05 23.76 25.64 26.23 52‐D NI NI NI NI NI NI NI NI NI NI NI NI 56‐D NI NI NI NI NI NI NI NI NI NI NI NI 57‐D NI NI NI NI NI NI NI NI NI NI NI NI B2‐Aquifer Wells 11‐DD 15.60 14.31 NM 14.19 13.59 15.66 14.01 15.18 16.54 22.66 14.02 16.37 18‐DD 15.73 15.2 18.25 16.90 16.44 17.86 16.07 16.15 17.97 22.42 20.79 21.59 20‐DD 18.52 17.48 NM 18.85 17.64 18.91 8.43 18.85 19.27 22.23 23.16 24.04 32‐DD 14.72 14.53 NM 19.23 15 19.13 12.85 11.92 17.24 22.80 17.72 19.75 42‐DD 15.19 14.61 17.64 16.27 15.4 15.94 14.82 16.42 16.74 20.06 20.60 21.33 43‐DD 13.43 12.83 NM 15.56 13.88 12.32 12.55 15.82 15.79 17.46 19.51 20.09 44‐DD 17.22 16.17 NM 17.86 NM NM NM NM NM NM NM NM 45‐DD 18.33 16.75 20.00 18.10 17.6 12.75 17.75 16.81 18.82 20.29 22.45 23.19 49‐DD 19.08 18.69 21.96 20.09 19.74 18.34 18.61 21.37 22.14 23.47 26.81 26.32 53‐DD NI NI NI NI NI NI NI NI NI NI NI NI 54‐DD NI NI NI NI NI NI NI NI NI NI NI NI 56‐DD NI NI NI NI NI NI NI NI NI NI NI NI 57‐DD NI NI NI NI NI NI NI NI NI NI NI NI B3‐Aquifer Wells 50‐DDD 19.15 18.57 23.65 21.39 21.33 18.40 17.82 22.64 23.10 24.24 27.70 28.01 NOTES: All Groundwater Elevations Reported in Feet Above Mean Sea Level (USGS Datum). c=JNM Not measured 2004, and feet NAVD88 since 2005. Top of casing elevations were resurveyed in 2005, with the exception of the wells installed and surveyed in 2015 through 2018. Groundwater elevatio Groundwater elevations measured during subsequent monitoring events were calculated using resurveyed elevations. NI Well not installed. DRY Water level was below bottom of casing. - Well Closed In Place

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WELL MONITORING EVENT ID Oct‐07 Apr‐08 Jul‐08 Oct‐08 Oct‐09 Oct‐10 Oct‐11 Oct‐12 Oct‐13 Oct‐14 Oct‐15 Oct‐16 Oct‐17 Oct‐18 A‐Aquifer Wells 1‐S 25.88 26.12 25.55 25.34 25.25 25.32 25.49 25.13 25.18 25.03 25.09 2‐S 26.14 26.49 26.11 25.46 24.61 25.14 25.04 24.81 24.70 25.46 25.19 NM 27.08 NM 3‐S 28.79 28.97 28.84 28.69 28.41 28.47 28.42 28.26 28.23 28.03 27.71 4‐S 22.10 22.10 22.10 22.10 8‐S 25.17 25.13 25.10 24.62 25.92 24.92 24.42 24.41 24.28 24.57 25.44 9‐S DRY 22.10 22.10 22.10 22.10 22.10 22.10 22.10 22.10 11‐S 25.07 25.43 24.98 24.46 23.63 23.99 24.38 24.10 24.73 24.04 23.89 22.10 22.10 12‐S NM 26.88 26.59 26.45 NM NM NM NM NM NM NM 18‐S 24.94 25.60 24.67 24.21 23.64 23.92 24.04 23.77 24.19 23.90 23.88 22.10 19‐S 24.82 24.91 24.41 23.84 23.76 24.02 23.67 23.39 23.48 23.92 23.87 NM 26.74 27.09 24‐S NM 25.90 25.55 24.87 NM NM NM NM NM NM NM 31‐S 25.41 25.51 25.11 25.16 24.62 24.69 24.89 24.48 24.59 24.63 24.38 40‐S 27.37 27.71 27.43 26.92 26.58 26.61 26.70 26.61 26.41 27.43 26.53 27.55 27.67 29.23 41‐S 31.25 31.65 31.46 30.66 29.64 30.06 30.43 30.19 29.93 31.96 29.61 30.47 31.27 NM 49‐S 27.75 27.90 27.85 27.39 27.37 27.04 27.11 26.95 26.87 27.52 26.94 NM 29.45 30.40 53‐S NI NI NI NI NI NI NI NI NI NI NI 21.85 23.29 24.62 54‐S NI NI NI NI NI NI NI NI NI NI NI 22.61 23.24 24.25 55‐S NI NI NI NI NI NI NI NI NI NI NI NM NM 27.54 56‐S NI NI NI NI NI NI NI NI NI NI NI NI 27.97 28.67 57‐S NI NI NI NI NI NI NI NI NI NI NI NI 29.20 30.67 A/B1‐Aquifer Wells 6‐S/D NM 25.08 NA 23.50 NM NM NM NM NM NM NM 7‐S/D NM 25.19 24.51 24.32 NM NM NM NM NM NM NM B1‐Aquifer Wells 9‐D 22.10 22.10 22.10 22.10 22.10 22.10 22.10 10‐D 26.18 26.49 26.09 25.47 24.60 25.13 25.03 24.81 24.73 25.49 25.09 NM 27.11 NM 19‐D 24.55 24.90 23.81 23.41 23.56 23.63 23.43 23.07 23.14 23.51 23.50 NM 25.28 25.73 20‐D 24.90 25.19 24.60 24.26 24.69 24.37 24.1 23.87 23.95 24.21 24.33 24‐D NM 25.85 25.40 24.73 NM NM NM NM NM NM NM 31‐D NM 26.60 25.64 24.91 NM NM NM NM NM NM NM 40‐D 27.27 27.58 27.26 26.84 26.48 26.55 26.6 26.54 26.35 27.30 26.51 27.65 26.67 28.47 41‐D 31.29 31.70 31.47 30.72 29.68 30.09 30.47 30.26 29.96 32.02 29.69 30.56 31.56 NM 49‐DR1 27.82 28.17 27.91 27.25 27.35 26.97 27.21 27.05 26.92 27.82 26.88 28.62 29.39 28.96 51‐D 26.39 26.77 26.38 26.00 25.74 25.90 26.22 25.90 25.99 25.95 25.59 52‐D NI NI NI NI NI NI NI NI NI NI NI 23.17 23.69 24.43 56‐D NI NI NI NI NI NI NI NI NI NI NI NI 22.90 22.37 57‐D NI NI NI NI NI NI NI NI NI NI NI NI 29.08 30.43 B2‐Aquifer Wells 11‐DD 17.10 24.88 17.54 16.70 16.44 15.50 16.05 16.33 16.62 22.45 17.48 22.10 22.10 18‐DD 22.54 25.73 24.74 23.84 23.69 21.74 22.64 22.46 22.79 23.34 22.74 22.10 22.10 22.10 20‐DD 24.58 25.38 24.40 23.73 24.12 23.64 23.71 23.36 23.50 23.93 23.64 22.10 22.10 22.10 32‐DD 23.97 25.40 24.21 23.56 17.52 17.45 18.36 19.32 17.10 22.90 16.80 22.10 22.10 22.10 42‐DD 22.45 23.69 23.19 22.05 22.59 21.59 21.7 21.37 21.48 22.34 21.83 22.10 22.10 22.10 43‐DD 21.44 25.59 21.79 19.56 23.25 19.73 20.89 20.89 21.00 22.01 20.86 22.10 22.10 44‐DD NM 27.32 25.99 26.05 NM NM NM NM NM NM NM NM NM NM 45‐DD 23.68 24.79 23.89 23.01 23.26 22.96 23.38 23.14 23.20 23.48 22.26 25.92 26.68 27.20 49‐DD 27.85 28.61 27.95 25.71 27.22 25.98 27.11 26.91 26.96 27.43 26.18 28.13 28.91 29.61 53‐DD NI NI NI NI NI NI NI NI NI NI NI 19.35 19.83 NM 54‐DD NI NI NI NI NI NI NI NI NI NI NI 17.51 19.28 19.65 56‐DD NI NI NI NI NI NI NI NI NI NI NI NI 25.32 25.68 57‐DD NI NI NI NI NI NI NI NI NI NI NI NI 27.62 28.20 B3‐Aquifer Wells 50‐DDD 29.62 29.56 28.72 27.71 26.71 27.20 28.41 28.29 27.85 28.22 25.50 22.10 22.10 22.10 NOTES: All Groundwater Elevations Reported in Feet Above Mean Sea Level (USGS Datum). NM Not measured 2004, and feet NAVD88 since 2005. Top of casing elevations were resurveyed in 2005, with the exception of the wells installed and surveyed in 2015 through 2018. Groundwater elevations Groundwater elevations measured during subsequent monitoring events were calculated using resurveyed elevations. NI Well not installed. DRY Water level was below bottom of casing. Well Closed In Place 1 Well 49‐D was replaced with well 49‐DR in 2018. -

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APPENDIX B

Historical TCE, cDCE, and Total VOC Concentrations

TABLE B‐1 Page 1 of 8 HISTORICAL TRICHLOROETHENE CONCENTRATIONS 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

Concentrations reported in micrograms per liter (µg/L) Extraction Wells Date EW‐1EW‐2EW‐3EW‐4EW‐5EW‐6EW‐7EW‐8EW‐9EW‐10 EW‐11 EW‐12 EW‐13 EW‐14 EW‐15 EW‐16 EW‐17 EW‐18 EW‐19 EW‐20 EW‐21 Feb‐82 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Mar‐82 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Apr‐82 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI May‐82 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jun‐82 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Aug‐82 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI May‐83 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jul‐83 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Sep‐83 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Mar‐84 21 ND ND ND NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jun‐84 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jul‐84 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Aug‐84 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Sep‐84 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Oct‐84NSNSNSNS390470NSNINININININININININININININI Nov‐84 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Dec‐84 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jan‐85 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Feb‐85 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Mar‐85 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Apr‐85 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI May‐85 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jun‐85 410 NS ND 4 NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jul‐85 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Aug‐85NSNSNSNSNS500NSNINININININININININININININI Oct‐85474NSNSNSNSNSNSNINININININININININININININI Dec‐85 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Feb‐86NSNSNSNS410490NSNINININININININININININININI Apr‐86 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jun‐86NS570NSNSNSNSNSNINININININININININININININI Aug‐86360NSNSNSNSNS76NINININININININININININININI Oct‐86 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Dec‐86 NS NS 2.3 NS NS NS 560 NI NI NI NI NI NI NI NI NI NI NI NI NI NI Feb‐87NS420NSNSNS280360NINININININININININININININI Apr‐87NSNSNSNSNSNS400NINININININININININININININI Jun‐87 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Aug‐87NSNSNSNSNSNS340NINININININININININININININI Oct‐87 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Dec‐87 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Mar‐88 NS 500 NS 45 NS 150 ND NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jun‐88NSNSNS8NS87NSNINININININININININININININI Sep‐88NSNSNS9.8440220NSNINININININININININININININI Dec‐88NSNSNSNSNSNS340NINININININININININININININI Mar‐89 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jun‐89 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Oct‐89 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Jan‐90NSNSNSNSNS300NSNINININININININININININININI Apr‐90NSNSNS28190190NSNINININININININININININININI Jul‐90 NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI NI Oct‐90NSNSNS44210180NSNINININININININININININININI Jan‐91NSNSNSNSNSNS220NINININININININININININININI Apr‐91NSNSNSNS190130NSNINININININININININININININI Jul‐91 NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI Oct‐91NS520NS7.5180110NSNSNININININININININININININI Jan‐92 NS NS NS NS NS NS 89 NS NI NI NI NI NI NI NI NI NI NI NI NI NI

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Concentrations reported in micrograms per liter (µg/L) Extraction Wells Date EW‐1EW‐2EW‐3EW‐4EW‐5EW‐6EW‐7EW‐8EW‐9EW‐10 EW‐11 EW‐12 EW‐13 EW‐14 EW‐15 EW‐16 EW‐17 EW‐18 EW‐19 EW‐20 EW‐21 Apr‐92 NS NS NS NS 89 85 NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI Jul‐92NSNSNSNSNSNS380NSNININININININININININININI Oct‐92 NS NS NS NS 120 150 NS 160 20 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐93 NS NS NS NS NS NS 490 NS 6.1 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐93 NS NS NS NS NS 140 170 170 59 NI NI NI NI NI NI NI NI NI NI NI NI Jul‐93NSNSNSNSNSNS320NS62NINININININININININININI Oct‐93 NS 280 NS 5 84 170 NS 170 44 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐94 NS NS 2.6 NS NS NS 300 NS 66 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐94 NS 140 NS 2.7 37 48 NS 140 58 NI NI NI NI NI NI NI NI NI NI NI NI Jul‐945.6NS1.1NSNSNS270NS50NINININININININININININI Oct‐94 NS 240 NS 5 76 130 NS 170 67 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐95 7.7 NS ND NS NS NS 190 NS 49 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐95 NS 350 NS 5.3 72 120 NS 150 48 NI NI NI NI NI NI NI NI NI NI NI NI Jul‐9512NSNDNSNSNS220NSNSNINININININININININININI Oct‐95 NS 270 NS 5.6 69 120 NS 150 60 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐96 6.9 300 ND 4.3 78 100 190 130 44 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐96 NS 350 NS NS 55 100 240 140 39 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐97 5.5 200 ND 4.6 73 140 160 120 34 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐97 8.4 200 0.61 4.7 80 110 200 120 32 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐98 NS NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Oct‐98NSNSNSNSNS110NSNSNSNINININININININININININI Oct‐99 NS NS NS NS 110 86 250 160 41 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐00 NS NS NS NS NS 82 NS 140 NS NI NI NI NI NI NI NI NI NI NI NI NI Mar‐00 NS NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Jun‐00 NS NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Oct‐00 NS NS NS NS 110 65 NS 110 33 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐01 NS NS NS NS 100 70 200 130 38 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐02 NS NS NS NS 96 65 150 130 36 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐03 NS NS NS NS 99 57 210 120 35 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐04 NS NS NS NS 81 110 180 100 28 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐05 96 200 0.8 15 61 69 160 100 42 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐06 85 230 ND 5.7 200 51 200 110 36 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐07 69 250 ND 36 96 58 220 95 32 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐08 77 170 1.6 6.9 70 57 230 90 35 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐09 89 170 0.8 5.9 68 52 140 110 34 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐1065140ND5.269601408730NINININININININININININI Oct/Nov‐11 95 130 0.8 5.6 67 56 120 84 29 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐1283130ND7.462581209832NINININININININININININI Oct/Nov‐13 93 130 1.0 4.6 55 57 120 97 33 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐14 78 130 0.5 4.8 65 50 130 110 30 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐18 5687131.983797027324.63184

ND Not Detected NI Not Installed NS Not Sampled Well Destroyed

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Concentrations reported in micrograms per liter (µg/L) A‐Zone Wells Date 1‐S2‐S3‐S4‐S8‐S9‐S11‐S12‐S18‐S19‐S24‐S31‐S40‐S41‐S49‐S53‐S54‐S55‐S56‐S57‐S Feb‐82NS230NS490NSNSNSNSNSNSNSNSNSNSNSNININININI Mar‐82 NS 230 NS NS 270 1000 16 NS NS NS NS NS NS NS NS NI NI NI NI NI Apr‐82 NS NS NS NS NS NS NS NS 36 37 2 NS NS NS NS NI NI NI NI NI May‐82 NS NS NS NS 380 NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Jun‐82 NS 160 NS 2000 NS 4100 88 NS 1 13 NS 350 NS NS NS NI NI NI NI NI Aug‐82 NS 220 NS 2100 210 4800 2 NS 15 NS NS 320 NS NS NS NI NI NI NI NI May‐83 NS NS NS 1200 NS 3700 NS NS NS NS NS NS NS NS NS NI NI NI NI NI Jul‐83 NS 500 NS NS NS NS NS NS ND ND ND NS NS NS NS NI NI NI NI NI Sep‐83 NS 1600 4 1700 NS 3500 1 NS 1 NS 3 150 70 1900 NS NI NI NI NI NI Mar‐84 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Jun‐84 NS 810 NS NS NS NS 1 NS 2 1 ND NS NS NS NS NI NI NI NI NI Jul‐84 NS 846 NS NS NS NS 2 NS 1 NS 1 NS NS NS NS NI NI NI NI NI Aug‐84 NS 930 NS NS NS NS 2 NS NS NS ND NS 490 NS NS NI NI NI NI NI Sep‐84 NS 900 NS NS NS NS NS NS ND NS NS NS 540 2900 NS NI NI NI NI NI Oct‐84 NS 830 NS NS NS NS NS NS ND NS NS ND 350 1500 NS NI NI NI NI NI Nov‐84 NS 2300 NS 4100 190 NS 37 NS NS ND NS ND NS 7500 NS NI NI NI NI NI Dec‐84 NS 850 NS 1400 NS NS NS NS 4 2 59 NS 1200 NS NS NI NI NI NI NI Jan‐85 NS 1000 NS 1100 NS 3500 NS NS NS NS 105 NS 880 2600 NS NI NI NI NI NI Feb‐85 NS 910 NS NS 76 NS 16 NS 2 ND 140 NS 860 1500 NS NI NI NI NI NI Mar‐85 NS 670 NS 1300 NS NS ND NS ND NS 190 NS 1100 1600 NS NI NI NI NI NI Apr‐85 NS 1200 NS 1100 NS NS NS NS NS ND 23 9 810 1700 NS NI NI NI NI NI May‐85 NS 940 NS NS NS NS 420 NS ND NS 180 NS 850 NS NS NI NI NI NI NI Jun‐85NS1190NSNSNSNS21NS1 ND310NSNSNSNSNININININI Jul‐85 NS 260 NS 1960 120 4300 13 NS 2 ND 430 NS 1340 NS NS NI NI NI NI NI Aug‐85 NS 1360 NS NS NS NS NS NS NS NS 400 NS NS 3700 NS NI NI NI NI NI Oct‐85 NS 379 NS NS NS NS 21 NS 12 NS 446 NS 732 2446 NS NI NI NI NI NI Dec‐85 NS 1100 ND NS 130 3900 NS NS 96 1.6 460 NS NS NS NS NI NI NI NI NI Feb‐86 NS 870 NS 1100 NS NS 12 NS 15 NS 520 NS 720 560 NS NI NI NI NI NI Apr‐86 NS 1250 NS NS NS 1800 NS NS NS NS NS 23 670 3100 NS NI NI NI NI NI Jun‐86 NS NS NS 1500 NS NS NS NS 24 NS 650 NS 1000 1900 NS NI NI NI NI NI Aug‐86 NS NS NS NS NS 2000 11 NS NS NS NS NS NS NS NS NI NI NI NI NI Oct‐86 NS 840 NS 1400 100 1600 14 NS 25 NS 650 NS NS 2100 NS NI NI NI NI NI Dec‐86 NS NS NS NS NS 1500 4.9 NS 5 NS NS NS NS NS NS NI NI NI NI NI Feb‐87 NS NS NS NS NS 1300 7.2 NS 7.4 NS NS NS NS 2200 NS NI NI NI NI NI Apr‐87 NS NS NS NS 130 1150 7 NS 7 NS ND NS NS NS NS NI NI NI NI NI Jun‐87 NS NS NS NS NS 1100 5 NS ND NS NS 2 ND NS NS NI NI NI NI NI Aug‐87 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Oct‐87 NS NS NS NS NS 800 NS ND NS NS NS 1 ND NS NS NI NI NI NI NI Dec‐87 NS NS NS NS 65 NS NS NS NS NS NS NS NS 750 NS NI NI NI NI NI Mar‐88 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Jun‐88 ND NS ND NS NS NS NS ND NS NS NS NS NS NS NS NI NI NI NI NI Sep‐88 NS NS NS NS NS NS NS 0.6 NS NS NS NS NS NS NS NI NI NI NI NI Dec‐88 NS NS NS AB NS AB NS 1 NS NS NS NS NS NS 200 NI NI NI NI NI Mar‐89 NS NS NS AB NS AB NS 0.7 NS NS NS NS 70 390 170 NI NI NI NI NI Jun‐89 NS NS NS AB NS AB NS NS NS NS NS NS 110 NS 130 NI NI NI NI NI Oct‐89 NS NS NS AB NS AB NS NS NS NS NS NS NS NS 150 NI NI NI NI NI Jan‐90 NS NS NS NS NS NS ND NS NS NS NS NS NS NS NS NI NI NI NI NI Apr‐90 NS NS NS NS NS NS NS NS NS NS NS NS 5 NS 120 NI NI NI NI NI Jul‐90 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Oct ‐90 NS NS NS NS NS NS NS NS NS NS NS NS NS NS 150 NI NI NI NI NI Jan‐91 NS NS NS NS NS NS NS ND 2 NS NS NS NS NS NS NI NI NI NI NI Apr‐91 NS NS NS NS NS NS NS NS NS NS NS NS 38 NS 130 NI NI NI NI NI Jul‐91 NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Oct‐91 NS NS NS NS NS NS NS NS NS NS 49 NS 240 NI NI NI NI NI Jan‐92NSNSNS NS NS1.4NSNSNSNSNSNSNSNININININI

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Concentrations reported in micrograms per liter (µg/L) A‐Zone Wells Date 1‐S2‐S3‐S4‐S8‐S9‐S11‐S12‐S18‐S19‐S24‐S31‐S40‐S41‐S49‐S53‐S54‐S55‐S56‐S57‐S Apr‐92 NS NS NS NS NS NS NS NS NS NS 22 NS 630 NI NI NI NI NI Jul‐92 NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Oct‐92 NS NS NS NS NS NS NS NS NS NS 30 NS 180 NI NI NI NI NI Jan‐93 ND NS ND 100 NS NS NS NS NS ND 12 NS 180 NI NI NI NI NI Apr‐93 ND NS ND 120 NS ND NS NS NS 14 35 130 140 NI NI NI NI NI Jul‐93 ND NS ND 120 NS ND NS NS NS 23 60 NS 150 NI NI NI NI NI Oct‐93 NS NS ND 120 NS NS NS NS NS 13 NS NS 140 NI NI NI NI NI Jan‐94 NS NS NS 96 NS NS NS NS NS 9.6 NS NS NS NI NI NI NI NI Apr‐94 ND NS ND 110 NS NS NS NS NS 8.7 44 NS NS NI NI NI NI NI Jul‐94 ND NS ND 99 NS NS NS NS NS 18 NS NS 130 NI NI NI NI NI Oct‐94 ND NS ND 120 2.2 NS NS NS NS 17 NS 9.5 NS NI NI NI NI NI Jan‐95 ND NS ND 92 NS NS NS NS 14 6.1 NS 97 NS NI NI NI NI NI Apr‐95 ND NS ND 71 1 NS NS NS NS 13 NS 210 NS NI NI NI NI NI Jul‐95 ND NS ND 58 NS NS NS NS NS 17 46 28 28 NI NI NI NI NI Oct‐95 ND NS ND 97 NS NS NS NS NS 7.2 NS 11 NS NI NI NI NI NI Apr‐96 ND NS ND 65 ND DRY DRY DRY DRY 7.9 25 140 110 NI NI NI NI NI Oct‐96 NS NS NS NS NS NS NS NS NS NS NS 11 130 NI NI NI NI NI Apr‐97 ND NS ND 23 ND NS NS NS NS 8.2 20 73 91 NI NI NI NI NI Oct‐97 ND NS ND 46 NS NS NS NS NS 4.6 NS 190 NS NI NI NI NI NI Apr‐98 NS 24 NS NS ND NS 1.3 NS NS NS 13 65 NS NI NI NI NI NI Oct‐98 ND NS ND 53 0.8 NS NS NS NS 13 23 140 82 NI NI NI NI NI Oct‐99 ND NS ND 49 NS NS NS NS NS 20 10 210 93 NI NI NI NI NI Jan‐00 NS NS NS NS NS NS NS NS NS 12 NS NS NS NI NI NI NI NI Mar‐00 NS NS NS NS NS NS NS NS NS 14 NS NS NS NI NI NI NI NI Jun‐00 NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Oct‐00 ND NS ND 37 0.6 NS NS NS NS NS NS 200 97 NI NI NI NI NI Oct‐01 0.5 NS ND 29 1.5 NS 0.9 NS NS 13 NS 280 110 NI NI NI NI NI Oct/Nov‐02 ND NS ND 44 0.6 NS 1.5 NS NS 11 28 280 92 NI NI NI NI NI Oct‐03 ND NS ND 52 0.8 NS 1.9 NS NS 11 17 310 43 NI NI NI NI NI Oct‐04 ND 130 ND 29 0.9 NS 2.2 ND NS 6.4 160 50 35 NI NI NI NI NI Oct‐05 ND 95 ND 21 1.5 NS 3.1 ND NS 10 280 230 36 NI NI NI NI NI Oct‐06 ND 120 ND 17 1.4 NS 4.1 3.3 NS 12 180 300 31 NI NI NI NI NI Oct‐07 ND 160 ND 16 1.7 NS 2.5 ND NS 9.0 250 250 30 NI NI NI NI NI Oct‐08 ND 150 ND 13 1.5 NS 3.3 58 NS 8.5 200 370 26 NI NI NI NI NI Oct‐09 ND 130 ND 9.0 1.8 NS 2.8 1.2 NS 6.9 230 210 30 NI NI NI NI NI Oct/Nov‐10 ND 130 ND 9.6 1.6 NS 2.4 2.0 NS 5.3 220 210 22 NI NI NI NI NI Oct/Nov‐11 ND 100 ND 13 1.4 NS 2.5 3.7 NS 5.8 100 210 18 NI NI NI NI NI Oct/Nov‐12 ND 110 ND 13 1.5 NS 3.2 4.7 NS 7.5 100 240 24 NI NI NI NI NI Oct/Nov‐13 ND 120 ND 12 1.8 NS 3.3 8.7 NS 6.0 110 190 31 NI NI NI NI NI Oct‐14 ND 100 ND 9.3 1.2 NS 2.1 5.5 NS 6.7 130 39 31 NI NI NI NI NI Oct‐18 NS 42 64 13 22 69 90 ND 33 ND

ND Not Detected NI Not Installed NS Not Sampled Well Destroyed

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Concentrations reported in micrograms per liter (µg/L) A/B1‐Zone Wells B1‐Zone Wells B2‐Zone Wells Date 6‐S/D 7‐S/D 9‐D10‐D19‐D20‐D24‐D31‐D40‐D41‐D49‐DR* 51‐D52‐D56‐D57‐D11‐DD 18‐DD 20‐DD 32‐DD 42‐DD Feb‐82 NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NS NS NS NS NS Mar‐8218620100056NSNSNSNSNSNSNSNSNININI30NSNSNSNS Apr‐82 NS NS NS NS 69 200 5 NS NS NS NS NS NI NI NI NS 380 61 NS NS May‐82 NS NS NS NS NS NS NS 29 NS NS NS NS NI NI NI NS NS NS NS NS Jun‐82 NS NS 3100 5 NS 1800 NS NS NS NS NS NS NI NI NI 32 430 4 86 NS Aug‐82 31 560 6600 130 NS 2200 NS 61 NS NS NS NS NI NI NI 5 NS 2 140 NS May‐83NSNS650NSNSNSNSNSNSNSNSNSNINININSNSNSNSNS Jul‐83NSNSNSND5 NSNSNSNSNSNSNSNINININS2600NSNSNS Sep‐83 60 NS NS 1 40 840 NS NS 30 810 NS NS NI NI NI 6 NS ND NS NS Mar‐84 NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NS NS NS NS NS Jun‐84 NS NS NS ND ND NS ND NS NS NS NS NS NI NI NI ND 1240 NS NS NS Jul‐84 NS NS NS ND ND NS ND NS NS NS NS NS NI NI NI NS 2900 NS NS NS Aug‐84 NS 1600 NS ND 2 NS ND NS 12 NS NS NS NI NI NI ND 1400 NS 18 NS Sep‐84 220 NS NS ND 7 1460 NS NS NS 430 NS NS NI NI NI ND 590 ND 27 NS Oct‐84 170 1100 NS 2 4 970 NS NS NS NS NS NS NI NI NI ND 1600 NS NS NS Nov‐84300NSNSNSNSNSNSNS4880NSNSNINININSNSNS9 NS Dec‐84 140 NS NS NS NS 1300 NS NS 6 NS NS NS NI NI NI 13 1400 NS 9 NS Jan‐85 NS NS NS 8 6 NS NS NS NS 690 NS NS NI NI NI 30 1200 9 5 NS Feb‐852201400NSNSNS120070NSNSNSNSNSNININI651500NSNSNS Mar‐85 NS NS NS NS 12 NS 34 NS 5 1300 NS NS NI NI NI 81 1600 ND NS NS Apr‐85 147 1300 2800 10 13 NS 37 190 NS NS NS NS NI NI NI 49 1400 NS NS NS May‐85 NS NS NS NS 20 NS 1000 200 NS 740 NS NS NI NI NI 130 140 2 720 NS Jun‐85 NS NS NS 6 3 NS 160 250 6 1040 NS NS NI NI NI 180 1550 NS 1000 NS Jul‐85 NS NS NS 9 NS NS 250 NS NS 1390 NS NS NI NI NI 180 590 NS 770 NS Aug‐85 NS NS 3400 10 1 1600 330 NS 9 NS NS NS NI NI NI 220 1900 ND 1140 NS Oct‐85 411 NS NS 13 NS NS 296 NS NS 889 NS NS NI NI NI 273 1308 1 828 NS Dec‐85 NS NS 4500 8.3 4.8 NS 160 NS 40 980 NS NS NI NI NI 240 1200 3.3 760 ND Feb‐86 NS NS NS 14 NS NS 360 NS NS NS NS NS NI NI NI 240 1000 NS NS ND Apr‐86 NS NS 4000 NS NS 1000 170 ND 23 850 NS NS NI NI NI 170 1500 2.7 NS 1.3 Jun‐86 NS 1100 3000 NS 3.3 NS 470 250 NS NS NS NS NI NI NI 470 1500 8.3 NS 0.7 Aug‐86 NS NS 7200 NS 2.1 NS 390 270 83 1200 NS NS NI NI NI 430 1800 4.9 NS 1.2 Oct‐86 NS NS NS 3.7 13 NS NS NS 110 NS NS NS NI NI NI 190 1300 6.2 NS NS Dec‐86 NS NS NS 11 2.9 NS 490 NS 26 1600 NS NS NI NI NI 220 830 5.2 NS 1.3 Feb‐87 18 NS 2400 NS NS NS 360 110 NS 1300 NS NS NI NI NI 170 650 NS NS 0.8 Apr‐87 NS NS 3800 11 4 NS 550 NS 72 NS NS NS NI NI NI 180 610 NS 890 1 Jun‐87 21 NS 3500 10 NS NS NS NS 75 1200 NS NS NI NI NI 130 500 3 800 1 Aug‐87 NS NS NS 17 NS NS 660 100 NS NS NS NS NI NI NI 80 320 ND NS 1 Oct‐87 80 NS 2000 30 2 NS 420 27 110 NS NS NS NI NI NI 41 560 NS NS 2 Dec‐87 NS NS 2200 NS NS 600 NS NS NS 700 NS NS NI NI NI 22 240 NS NS NS Mar‐88 NS NS 2200 NS NS 850 170 NS 42 850 NS NS NI NI NI 9 120 22 NS NS Jun‐88 NS NS 1100 140 NS NS 190 63 63 530 NS NS NI NI NI NS 180 NS 570 NS Sep‐88 NS NS NS 130 9.6 NS NS NS 58 830 NS NS NI NI NI 11 180 1.4 580 4.1 Dec‐88NSNSNS12515NS70NS42NS23NSNININI10130NS3904 Mar‐89 23 NS NS 220 NS NS 45 8.2 NS NS NS NS NI NI NI 8.5 160 NS 610 2.7 Jun‐89 20 1100 NS 88 18 610 NS 29 21 540 6.3 NS NI NI NI 11 260 19 460 3.5 Oct‐89 14 NS NS NS NS NS NS NS NS NS 37 ND NI NI NI 11 450 4 NS 3 Jan‐90 NS 550 NS 48 16 NS NS NS 10 NS 4 NS NI NI NI 2 180 6 410 2 Apr‐90 20 NS NS 35 NS 370 5 3 10 NS 6 ND NI NI NI 13 40 6 540 ND Jul‐90 NS 850 NS 21 9 NS NS NS 11 990 ND NS NI NI NI 2 140 16 420 2 Oct‐90 24 ND NS 41 NS 800 49 7 18 2300 6 ND NI NI NI 10 68 32 450 3 Jan‐91 NS 910 NS 41 39 29 NS NS 12 2800 2 NS NI NI NI 8 200 29 330 1 Apr‐91 15 NS NS 20 NS 560 54 9 15 2000 3 ND NI NI NI 9 98 9 420 1 Jul‐91 NS 610 37 65 NS NS NS 25 4300 4 NS NI NI NI 27 26 59 470 1 Oct‐91 19 NS 24 NS 280 70 8.9 27 1000 ND 6.6 NI NI NI 6.3 58 56 420 2 Jan‐92 NS 630 34 77 NS NS NS 18 1200 2.2 NS NI NI NI 6.9 82 48 460 1.2

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Concentrations reported in micrograms per liter (µg/L) A/B1‐Zone Wells B1‐Zone Wells B2‐Zone Wells Date 6‐S/D 7‐S/D 9‐D10‐D19‐D20‐D24‐D31‐D40‐D41‐D49‐DR* 51‐D52‐D56‐D57‐D11‐DD 18‐DD 20‐DD 32‐DD 42‐DD Apr‐92 15 NS 39 NS 240 49 9.4 28 520 3.8 2.7 NI NI NI 8.4 75 120 280 1.6 Jul‐92 NS 660 37 81 NS NS NS 34 1000 4.9 NS NI NI NI 8.6 74 220 550 3.8 Oct‐92 17 NS 32 NS 200 63 7.3 50 820 4.4 0.7 NI NI NI 8.2 9.7 80 230 3.5 Jan‐93 NS 1400 NS NS NS NS NS NS 2600 NS NS NI NI NI NS 34 83 NS NS Apr‐93 NS NS 120 83 500 85 5.5 78 2300 1.5 ND NI NI NI 3.8 67 69 360 2.1 Jul‐93 NS 210 NS NS NS NS NS NS 870 NS NS NI NI NI NS 58 360 NS NS Oct‐93 17 NS NS NS 250 NS 5.8 NS 1100 NS NS NI NI NI NS 130 270 270 NS Jan‐94NS340 NSNSNSNSNSNS1300NSNSNINININS41220NSNS Apr‐94 16 NS 85 45 120 30 ND 52 730 0.96 ND NI NI NI 0.62 47 230 280 ND Jul‐94 NS 240 NS NS NS NS NS NS 690 NS NS NI NI NI NS 37 240 NS NS Oct‐94 NS NS NS NS 190 NS 5 NS 40 NS NS NI NI NI NS 45 47 230 NS Jan‐95 NS 170 NS NS NS NS NS NS 540 NS NS NI NI NI NS 24 31 NS NS Apr‐95 12 NS 88 110 200 64 7.7 70 480 0.7 0.6 NI NI NI 8.8 14 220 230 12 Jul‐95 NS 420 NS NS NS NS NS NS 480 NS NS NI NI NI NS 17 310 NS NS Oct‐95 NS NS NS NS 340 NS 6.8 NS 690 NS NS NI NI NI NS 9.7 100 270 NS Apr‐96 12 220 110 79 190 39 4.9 32 270 2 ND NI NI NI 2.9 11 64 220 14 Oct‐96 NS 460 NS NS 140 NS NS NS 790 NS NS NI NI NI NS 18 NS 190 NS Apr‐97 9.1 230 160 65 37 39 5.5 31 450 2.8 ND NI NI NI 3 13 190 190 15 Oct‐97 11 81 170 120 100 28 9.1 22 190 1.7 ND NI NI NI 13 13 140 200 13 Apr‐98 NS NS 97 NS NS NS NS NS 140 NS NS NI NI NI NS NS NS NS 20 Oct‐98 NS NS 200 80 59 NS NS 47 250 2.4 ND NI NI NI 6 8.4 83 210 26 Oct‐99 NS NS 180 74 220 NS NS 28 230 ND ND NI NI NI 48 86 38 190 16 Jan‐00 NS NS NS NS NS NS NS NS NS NS NS NI NI NI NS 80 NS NS 13 Mar‐00 NS NS NS NS NS NS NS NS NS NS NS NI NI NI 4.1 * 8.4 NS NS 20 Jun‐00 NS NS NS NS NS NS NS NS NS NS NS NI NI NI NS 52 NS NS NS Oct‐00 NS NS 180 73 180 NS NS 51 180 1.8 ND NI NI NI 4.3 60 280 160 20 Oct‐01 NS NS 180 75 92 NS NS 45 220 1.4 1.8 NI NI NI 5.2 42 280 200 21 Oct/Nov‐02 NS NS 170 60 270 NS NS 56 230 3.0 0.6 NI NI NI 3.0 11 210 250 29 Oct‐03 NS NS 150 51 250 NS NS 5.0 240 2.0 ND NI NI NI 7.1 4.0 220 200 20 Oct‐04 NS NS 91 7.1 83 NS NS 32 220 3.3 ND NI NI NI 11 7.5 250 160 19 Oct‐05 NS NS 68 1.2 85 NS NS 120 250 1.4 ND NI NI NI 26 40 270 220 7.9 Oct‐06 NS NS 47 0.8 19 NS NS 65 230 1.7 ND NI NI NI 18 6.3 160 300 29 Oct‐07 NS NS 52 2.6 7.6 NS NS 51 88 1.2 ND NI NI NI 4.3 6.7 180 170 19 Oct‐08 NS NS 45 1.6 13 NS NS 40 230 ND ND NI NI NI 14 ND 150 180 29 Oct‐09 NS NS 47 2.7 8.8 NS NS 86 210 0.8 ND NI NI NI 11 11 100 120 31 Oct/Nov‐10 NS NS 39 2.9 44 NS NS 55 280 1.0 ND NI NI NI 39 35 120 150 19 Oct/Nov‐11 NS NS 39 4.6 130 NS NS 80 220 0.9 ND NI NI NI 17 10 160 140 11 Oct/Nov‐12 NS NS 33 10 190 NS NS 73 130 0.6 ND NI NI NI 28 5.5 180 130 10 Oct/Nov‐13 NS NS 35 15 150 NS NS 73 200 ND ND NI NI NI 20 37 130 130 15 Oct‐14 NS NS 26 15 170 NS NS 54 120 ND ND NI NI NI 45 29 65 150 12 Oct‐18 NS 45 38 56 ND ND 82 77

ND Not Detected NI Not Installed NS Not Sampled Well Destroyed * 49‐DR replaced 49‐D in 2018.

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Concentrations reported in micrograms per liter (µg/L) B2‐Zone Wells B3‐Zone Well Date 43‐DD 44‐DD 45‐DD 49‐DD 53‐DD 54‐DD 56‐DD 57‐DD 50‐DDD Feb‐82 NS NS NS NS NI NI NI NI NS Mar‐82 NS NS NS NS NI NI NI NI NS Apr‐82 NS NS NS NS NI NI NI NI NS May‐82 NS NS NS NS NI NI NI NI NS Jun‐82 NS NS NS NS NI NI NI NI NS Aug‐82 NS NS NS NS NI NI NI NI NS May‐83 NS NS NS NS NI NI NI NI NS Jul‐83 NS NS NS NS NI NI NI NI NS Sep‐83 NS NS NS NS NI NI NI NI NS Mar‐84 NS NS NS NS NI NI NI NI NS Jun‐84 NS NS NS NS NI NI NI NI NS Jul‐84 NS NS NS NS NI NI NI NI NS Aug‐84 NS NS NS NS NI NI NI NI NS Sep‐84 NS NS NS NS NI NI NI NI NS Oct‐84 NS NS NS NS NI NI NI NI NS Nov‐84 NS NS NS NS NI NI NI NI NS Dec‐84 NS NS NS NS NI NI NI NI NS Jan‐85 NS NS NS NS NI NI NI NI NS Feb‐85 NS NS NS NS NI NI NI NI NS Mar‐85 NS NS NS NS NI NI NI NI NS Apr‐85 NS NS NS NS NI NI NI NI NS May‐85 NS NS NS NS NI NI NI NI NS Jun‐85 NS NS NS NS NI NI NI NI NS Jul‐85 NS NS NS NS NI NI NI NI NS Aug‐85 NS NS NS NS NI NI NI NI NS Oct‐85 NS NS NS NS NI NI NI NI NS Dec‐85 3500 NS NS NS NI NI NI NI NS Feb‐86 2400 NS NS NS NI NI NI NI NS Apr‐86 1500 NS NS NS NI NI NI NI NS Jun‐86 3000 NS NS NS NI NI NI NI NS Aug‐86260NSNSNSNININININS Oct‐86 2200 NS NS NS NI NI NI NI NS Dec‐86 2900 ND ND NS NI NI NI NI NS Feb‐87 1000 ND ND NS NI NI NI NI NS Apr‐871700ND1NSNININININS Jun‐87 2000 ND ND NS NI NI NI NI NS Aug‐87 2200 ND ND NS NI NI NI NI NS Oct‐87380NDNDNSNININININS Dec‐871000ND1NSNININININS Mar‐88200NSNSNSNININININS Jun‐88 NS ND ND NS NI NI NI NI NS Sep‐88160NDNDNSNININININS Dec‐88790NDNDNDNININININS Mar‐89100NDNDNSNININININS Jun‐898400.81.2NDNININININS Oct‐89 460 ND 1 ND NI NI NI NI ND Jan‐9055ND1NDNININININS Apr‐90 650 ND 1 ND NI NI NI NI ND Jul‐90 99 1 1 ND NI NI NI NI NS Oct‐9062ND3NDNININININD Jan‐9166ND1NDNININININS Apr‐91 78 ND 5 3 NI NI NI NI ND Jul‐9176ND7NDNININININS Oct‐91 110 ND 10 0.8 NI NI NI NI 0.6 Jan‐9268ND9NDNININININS

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Concentrations reported in micrograms per liter (µg/L) B2‐Zone Wells B3‐Zone Well Date 43‐DD 44‐DD 45‐DD 49‐DD 53‐DD 54‐DD 56‐DD 57‐DD 50‐DDD Apr‐92 52 ND 28 4.8 NI NI NI NI ND Jul‐92 58 2.3 65 ND NI NI NI NI NS Oct‐92 39 2.2 13 0.7 NI NI NI NI ND Jan‐93 NS NS 14 NS NI NI NI NI NS Apr‐93 73 0.7 21 ND NI NI NI NI ND Jul‐93 NS NS 11 NS NI NI NI NI NS Oct‐93 41 ND 9.2 NS NI NI NI NI 1.8 Jan‐94NSND7.7NSNININININS Apr‐94 ND ND ND ND NI NI NI NI ND Jul‐94NSNS5NSNININININS Oct‐94 25 ND 4.8 NS NI NI NI NI ND Jan‐95NSNS6.8NSNININININS Apr‐95 21 0.7 3.1 0.5 NI NI NI NI ND Jul‐95NSNS3.8NSNININININS Oct‐95 27 ND 5.5 NS NI NI NI NI ND Apr‐96 16 ND 1.1 ND NI NI NI NI ND Oct‐96 18 ND 1.2 NS NI NI NI NI NS Apr‐97 13 ND 1.7 ND NI NI NI NI ND Oct‐97 12 ND 1.8 0.5 NI NI NI NI ND Apr‐98 NS NS NS NS NI NI NI NI NS Oct‐98 6.5 NS 3 ND NI NI NI NI ND Oct‐99 ND NS ND ND NI NI NI NI ND Jan‐00 NS NS NS NS NI NI NI NI NS Mar‐00 NS NS NS NS NI NI NI NI NS Jun‐00 NS NS NS NS NI NI NI NI NS Oct‐00 6.9 NS 0.6 ND NI NI NI NI ND Oct‐016.8NSNDNDNININININD Oct/Nov‐02 9.1 NS 9.6 ND NI NI NI NI ND Oct‐035.4NSNDNDNININININD Oct‐043.9NSNDNDNININININD Oct‐053.3NSNDNDNININININD Oct‐067.0NSNDNDNININININD Oct‐073.4NSNDNDNININININD Oct‐083.4NSNDNDNININININD Oct‐092.9NSNDNDNININININD Oct/Nov‐102.5NSNDNDNININININD Oct/Nov‐11 2.7 NS 0.8 ND NI NI NI NI ND Oct/Nov‐123.8NSNDNDNININININD Oct/Nov‐13 2.4 NS 2.0 ND NI NI NI NI ND Oct‐14 1.7 NS 0.6 ND NI NI NI NI ND Oct‐18 NS 0.75 ND 35 0.85 37 0.82

ND Not Detected NI Not Installed NS Not Sampled Well Destroyed

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Concentrations reported in micrograms per liter (µg/L) Extraction Wells Date EW‐1EW‐2EW‐3EW‐4EW‐5EW‐6EW‐7EW‐8EW‐9EW‐10 EW‐11 EW‐12 EW‐13 EW‐14 EW‐15 EW‐16 EW‐17 EW‐18 EW‐19 EW‐20 EW‐21 Jan‐93 NS NS NS NS NS NS 89 NS ND NI NI NI NI NI NI NI NI NI NI NI NI Apr‐93 NS NS NS NS NS 488.4 192.1 17 2.5 NI NI NI NI NI NI NI NI NI NI NI NI Jul‐93 NS NS NS NS NS NS 191.7 NS 5.1 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐93 NS 182.3 NS 30 231.9 617.9 NS 18 5.7 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐94 NS NS ND NS NS NS 141.4 NS 6.2 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐94 NS 104.4 NS 30 164.5 299.2 NS 16 6.4 NI NI NI NI NI NI NI NI NI NI NI NI Jul‐94 5.9 NS ND NS NS NS 101.6 NS 16 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐94 NS 172.4 NS 43.6 172.4 256.4 NS 21 7.8 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐95 8.7 NS ND NS NS NS 24 NS 8.1 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐95 NS 141.2 NS 44 132.4 441.8 NS 15 6.5 NI NI NI NI NI NI NI NI NI NI NI NI Jul‐9514NSNDNSNSNS20NS7 NINININININININININININI Oct‐95 NS 73 NS 43 100 420 NS 13 ND NI NI NI NI NI NI NI NI NI NI NI NI Apr‐96 6.5 118.6 ND 37 131.2 496.1 24 15 5.9 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐96 NS 141.9 NS NS 93 464.9 6.2 5.2 6 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐97 9.4 120 ND 43 193.8 630 27 15 6.7 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐97 8.9 111.8 1.8 32 152 648 15 26 7.3 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐98 NS NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Oct‐98 NS NS NS NS NS 490 NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Oct‐99 NS NS NS NS 180 600 18 23 11 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐00 NS NS NS NS NS 486 NS 18 NS NI NI NI NI NI NI NI NI NI NI NI NI Mar‐00 NS NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Jun‐00 NS NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Oct‐00 NS NS NS NS 200 430 17 33 11 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐01NSNSNSNS21039016218.2NINININININININININININI Oct/Nov‐02 NS NS NS NS 243 356 13 25 20 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐03 NS NS NS NS 180 210 19 23 23 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐04 NS NS NS NS 150 140 17 21 24 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐05 50 112 ND 121 122 112 28 16 15 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐06 53 78 ND 112 22 113 19 18 16 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐07 36.8 78.2 ND 28 66 101 15 14 13 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐08 48.7 56 1.0 171.3 143.2 76.4 8.8 23 13 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐09 45.8 50 0.6 233.8 132 77.5 11 15 16 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐10 34 38 ND 179.6 94.5 80.5 12 9.4 13 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐11 40.8 39 0.8 243.6 152.1 70.4 11 9.7 13 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐12 47 44 ND 220 140 75 12 13 13 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐1340391.116011063138.916NINININININININININININI Oct‐14 37 31 0.5 170 95 52 13 6.3 9.9 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐153650ND1609547149.511NINININININININININININI Oct‐16 52 110 30 1.5 11 18 52 18 11 1.8 3.1 0.61 Oct‐17 6.1 65 6.0 0.77 11 16 39 11 13 3.1 2.3 1.8 Oct‐18 26 62 5.9 2.5 13 16 28 14 9.3 1.5 3.1 4.3

ND Not Detected NI Not Installed NS Not Sampled - Well Destroyed

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Concentrations reported in micrograms per liter (µg/L) A‐Zone Wells Date 1‐S2‐S3‐S4‐S8‐S9‐S11‐S12‐S18‐S19‐S24‐S31‐S40‐S41‐S49‐S53‐S54‐S55‐S56‐S57‐S Jan‐93 ND NS ND 23 NS NS NS NS NS 4.7 0.6 NS 686.2 NI NI NI NI NI Apr‐93 ND NS ND 25 NS ND NS NS NS 40 3 13 458.8 NI NI NI NI NI Jul‐93 ND NS ND 29 NS ND NS NS NS 72 8.8 NS 576.8 NI NI NI NI NI Oct‐93 NS NS ND 23 NS NS NS NS NS 25 NS NS 636.5 NI NI NI NI NI Jan‐94 ND ND ND 18 NS NS NS NS NS 25 NS NS NS NI NI NI NI NI Apr‐94 ND NS ND 27 NS NS NS NS NS 18 1.9 NS NS NI NI NI NI NI Jul‐94 ND NS ND 16 NS NS NS NS NS 37 NS NS 446.7 NI NI NI NI NI Oct‐94 ND NS ND 27 ND NS NS NS NS 35 NS 1.3 NS NI NI NI NI NI Jan‐95 ND NS ND 18 NS NS NS NS ND 15 NS 20 NS NI NI NI NI NI Apr‐95NDNSND 55.6 NDNSNSNSNS25NS24NSNININININI Jul‐95 ND NS ND 20 NS NS NS NS NS 39 2.3 82 326 NI NI NI NI NI Oct‐95 ND NS ND 25 NS NS NS NS NS 16 NS 45 NS NI NI NI NI NI Apr‐96 ND NS ND 24 ND NS NS NS NS 17 0.5 120.5 295.3 NI NI NI NI NI Oct‐96 NS NS NS NS NS NS NS NS NS NS NS 70.7 551 NI NI NI NI NI Apr‐97 ND NS ND 102.2 ND NS NS NS NS 19 0.9 171.9 326.3 NI NI NI NI NI Oct‐97NDNSND 58.6 NSNSNSNSNSNSNS39NSNININININI Apr‐98 NS ND NS NS ND NS ND NS NS NS 1.4 18 NS NI NI NI NI NI Oct‐98 ND NS ND 210 ND NS NS NS NS 32 2.2 33 280 NI NI NI NI NI Oct‐99 ND NS ND 171 NS NS NS NS NS 130 ND 61 432 NI NI NI NI NI Jan‐00 NS NS NS NS NS NS NS NS NS 69 NS NS NS NI NI NI NI NI Mar‐00 NS NS NS NS NS NS NS NS NS 80 NS NS NS NI NI NI NI NI Jun‐00 NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Oct‐00 ND NS ND 71 ND NS NS NS NS NS NS 77 450 NI NI NI NI NI Oct‐01 ND NS ND 57 ND NS ND NS NS 110 NS 81 440 NI NI NI NI NI Oct/Nov‐02 ND NS ND 202 ND NS ND NS NS 131 6.1 112 254 NI NI NI NI NI Oct‐03 ND NS ND 170 ND NS ND NS NS 130 6.8 110 61 NI NI NI NI NI Oct‐04 ND 51 ND 30 ND NS ND 3.3 NS 71 73 45 36 NI NI NI NI NI Oct‐05 ND 15 ND 11 ND NS ND 51 NS 83 71 99 18 NI NI NI NI NI Oct‐06 ND 44 ND 7.9 ND NS 5.0 48 NS 101 162 153 10 NI NI NI NI NI Oct‐07 ND 56 0.7 7.9 ND NS 4.4 31 NS 111 69 142 6.4 NI NI NI NI NI Oct‐08 ND 57 1.1 5.5 ND NS 5.8 16 NS 111 49 195 5.9 NI NI NI NI NI Oct‐09 ND 39 0.8 4.1 ND NS 5.6 26 NS 90 45 173 19 NI NI NI NI NI Oct/Nov‐10 ND 46 0.7 7.7 0.8 NS 5.8 31 NS 70 37 193 7.0 NI NI NI NI NI Oct/Nov‐11 ND 39 1.4 8.8 0.6 NS 6.7 42 NS 98 68 172 5.1 NI NI NI NI NI Oct/Nov‐12 ND 36 7.6 3.7 ND NS 2.9 31 NS 100 59 150 5.9 NI NI NI NI NI Oct/Nov‐13 ND 43 12 4.8 ND NS 2.6 40 NS 86 68 170 12 NI NI NI NI NI Oct‐14 ND 36 13 1.3 ND NS 0.9 23 NS 75 34 13 5.3 NI NI NI NI NI Oct‐15 ND 28 14 0.6 ND NS 1.9 30 NS 76 98 83 14 NI NI NI NI NI Oct‐16 NS NS 56 180 NS 42 24 3.5 NI NI Oct‐17 24 31 19 190 5.1 25 21 1.9 3.0 0.089 Oct‐18 NS 26 19 65 5.8 25 30 2.1 15 ND

ND Not Detected NI Not Installed NS Not Sampled - Well Destroyed

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Concentrations reported in micrograms per liter (µg/L) A/B1‐Zone Wells B1‐Zone Wells B2‐Zone Wells Date 6‐S/D 7‐S/D 9‐D10‐D19‐D20‐D24‐D31‐D40‐D41‐D49‐DR* 51‐D52‐D56‐D57‐D11‐DD 18‐DD 20‐DD 32‐DD 42‐DD Jan‐93 NS 362.9 NS NS NS NS NS NS 160 NS NS NI NI NI NS 1.9 53 NS NS Apr‐93 NS NS 51 170 152.2 25 68 210 8.6 4.5 ND NI NI NI ND 5.7 57 131.4 9.6 Jul‐93 NS 131.5 NS NS NS NS NS NS 192.2 NS NS NI NI NI NS 6 262.5 NS NS Oct‐93 40 NS NS NS 302.5 NS 44 NS 241.7 NS NS NI NI NI NS 13 251.7 272 NS Jan‐94 NS 281 NS NS NS NS NS NS 402 NS NS NI NI NI NS 3.7 170 NS NS Apr‐94 29 NS 23 5.3 112 13 78 160 130 4.5 ND NI NI NI ND 4.6 143 243 22 Jul‐94 NS 270.5 NS NS NS NS NS NS 95.1 NS NS NI NI NI NS 4 203.2 NS NS Oct‐94 NS NS NS NS 243.5 NS 49 NS NS NS NS NI NI NI NS 4.2 160 141.1 NS Jan‐95 NS 235.5 NS NS NS NS NS NS 78.7 NS NS NI NI NI NS 4 57 NS NS Apr‐95 51 NS 61 12 142 17 52.6 66 60 2.8 ND NI NI NI 0.8 2.3 273.4 131.3 171.5 Jul‐95 NS 253.9 NS NS NS NS NS NS 0.7 NS NS NI NI NI NS 1.8 220 NS NS Oct‐95 NS NS NS NS 260 NS 54 NS 70 NS NS NI NI NI NS 0.8 120 91 NS Apr‐96 42 175.2 42 14 202.9 15 46 62 69 8.4 ND NI NI NI ND 0.7 70 87.5 160 Oct‐96 NS 365.4 NS NS 34 NS NS NS 100.7 NS NS NI NI NI NS 0.6 NS 30 NS Apr‐97 26 163.5 48 11 19 11 44 50 66 7.5 ND NI NI NI ND 1.3 111.8 59.3 140 Oct‐97 51 94.1 48.67 13 242.7 9.7 55 58 16 5.7 ND NI NI NI 1.1 1.2 81.1 67.53 281.9 Apr‐98 NS NS 23 NS NS NS NS NS 12 NS NS NI NI NI NS NS NS NS 230 Oct‐98 NS NS 49 15 150 NS NS 62 28 6.1 ND NI NI NI ND 1.2 64 54 200 Oct‐99 NS NS 48 18 126.9 NS NS 62 57 6.6 ND NI NI NI 14 28 170 37 300 Jan‐00 NS NS NS NS NS NS NS NS NS NS NS NI NI NI ND 23 NS NS 247.2 Mar‐00 NS NS NS NS NS NS NS NS NS NS NS NI NI NI ND ND NS NS 280 Jun‐00 NS NS NS NS NS NS NS NS NS NS NS NI NI NI NS 16 NS NS NS Oct‐00 NS NS 62 25 94 NS NS NS 77 5.3 ND NI NI NI 1.4 21 160 41 370 Oct‐01 NS NS 98 28 74 NS NS 94 74 4.6 ND NI NI NI 3.9 16 150 45 360 Oct/Nov‐02 NS NS 141 24 83 NS NS 72 98 5.3 ND NI NI NI 3.8 2.9 101 38 404 Oct‐03 NS NS 170 15 78 NS NS 76 95 3.8 ND NI NI NI 17 1.1 100 54 420 Oct‐04 NS NS 250 1.9 110 NS NS 40 93 4.4 ND NI NI NI 17 2.9 110 40 400 Oct‐05 NS NS 242 2 15 NS NS 75 78 2 ND NI NI NI 36 16 73 70 98 Oct‐06 NS NS 332 4.7 3.4 NS NS 55 133 2.4 ND NI NI NI 42 5 70 64 395 Oct‐07 NS NS 380 6.6 1.7 NS NS 85 296 1.9 ND NI NI NI 17 1.4 73 47 353 Oct‐08 NS NS 290 15 3.3 NS NS 67 184 1 ND NI NI NI 7.2 29 68 13 386 Oct‐09 NS NS 323 30 1.3 NS NS 54 224 1.5 ND NI NI NI 6.9 5.1 67 52 348 Oct/Nov‐10 NS NS 393 27 14 NS NS 37 247 1.6 ND NI NI NI 17 11 132 41 413 Oct/Nov‐11 NS NS 343 28 51 NS NS 45 194 1.6 ND NI NI NI 13 4.1 69 56 326 Oct/Nov‐12 NS NS 340 25 72 NS NS 33 200 1.2 ND NI NI NI 8.0 2.7 65 30 350 Oct/Nov‐13 NS NS 310 28 52 NS NS 47 180 1.1 ND NI NI NI 20 10 70 35 290 Oct‐14 NS NS 350 24 66 NS NS 61 67 1.2 ND NI NI NI 15 7.4 95 48 350 Oct‐15 NS NS 290 34 41 NS NS 62 67 4.4 ND NI NI NI 2.8 8.8 56 33 140 Oct‐16 NS NS 71 170 1.4 0.72 NI NI Oct‐17 210 9.3 58 210 1.8 0.72 52 87 Oct‐18 NS 24 47 160 ND 0.32 91 100

ND Not Detected NI Not Installed NS Not Sampled - Well Destroyed * 49‐DR replaced 49‐D in 2018.

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Concentrations reported in micrograms per liter (µg/L) B2‐Zone Wells B3‐Zone Well Date 43‐DD 44‐DD 45‐DD 49‐DD 53‐DD 54‐DD 56‐DD 57‐DD 50‐DDD Jan‐93 NS NS ND NS NI NI NI NI NS Apr‐93 ND ND ND ND NI NI NI NI ND Jul‐93 NS NS ND NS NI NI NI NI NS Oct‐930.9NDNDNSNININININD Jan‐94 NS ND ND NS NI NI NI NI ND Apr‐94 ND ND ND ND NI NI NI NI ND Jul‐94 NS NS ND NS NI NI NI NI ND Oct‐94 ND ND ND NS NI NI NI NI ND Jan‐95 NS NS ND NS NI NI NI NI NS Apr‐95 ND ND ND ND NI NI NI NI ND Jul‐95 NS NS ND NS NI NI NI NI NS Oct‐95 ND ND ND NS NI NI NI NI ND Apr‐96 ND ND ND ND NI NI NI NI ND Oct‐96 ND ND ND NS NI NI NI NI NS Apr‐97 ND ND ND ND NI NI NI NI ND Oct‐97 ND ND ND ND NI NI NI NI ND Apr‐98 NS NS NS NS NI NI NI NI NS Oct‐98 ND NS ND ND NI NI NI NI ND Oct‐99 ND NS ND ND NI NI NI NI ND Jan‐00 NS NS NS NS NI NI NI NI NS Mar‐00 NS NS NS NS NI NI NI NI NS Jun‐00 NS NS NS NS NI NI NI NI NS Oct‐00 ND NS ND ND NI NI NI NI ND Oct‐01 ND NS ND ND NI NI NI NI ND Oct/Nov‐02NDNS2.6NDNININININD Oct‐03 ND NS ND ND NI NI NI NI ND Oct‐04 ND NS ND ND NI NI NI NI ND Oct‐05 ND NS ND ND NI NI NI NI ND Oct‐06 ND NS ND ND NI NI NI NI ND Oct‐07 ND NS ND ND NI NI NI NI ND Oct‐08 ND NS ND ND NI NI NI NI ND Oct‐09 ND NS ND ND NI NI NI NI ND Oct/Nov‐10 ND NS ND ND NI NI NI NI ND Oct/Nov‐11 ND NS ND ND NI NI NI NI ND Oct/Nov‐12 ND NS ND ND NI NI NI NI ND Oct/Nov‐13 ND NS ND ND NI NI NI NI ND Oct‐14 ND NS ND ND NI NI NI NI ND Oct‐15NDNS2.0NDNININININD Oct‐16 NS 0.88 ND 1.3 ND NI NI Oct‐17 NS 1.0 ND 0.44 0.39 71 0.19 Oct‐18 NS 0.57 ND 0.24 0.36 37 ND

ND Not Detected NI Not Installed NS Not Sampled - Well Destroyed

HALEY & ALDRICH, INC. \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\2_915 DeGuigne Drive\Deliverables\Five‐Year Report\2019_Five‐Year Review Report\5_appendix B‐historical VOC\Appendix B_915 Historical.xls JANUARY 2019 TABLE B‐3 Page 1 of 4 HISTORICAL TOTAL VOLATILE ORGANIC COMPOUND CONCENTRATIONS 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

Concentrations reported in micrograms per liter (µg/L) Extraction Wells Date EW‐1EW‐2EW‐3EW‐4EW‐5EW‐6EW‐7EW‐8EW‐9EW‐10 EW‐11 EW‐12 EW‐13 EW‐14 EW‐15 EW‐16 EW‐17 EW‐18 EW‐19 EW‐20 EW‐21 Jan‐91 NS NS NS NS NS NS 220 NS NI NI NI NI NI NI NI NI NI NI NI NI NI Apr‐91 NS NS NS NS 337 507 NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI Jul‐91 NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI Oct‐91 NS 710 NS 95 298 470 NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI Jan‐92 NS NS NS NS NS NS 99 NS NI NI NI NI NI NI NI NI NI NI NI NI NI Apr‐92 NS NS NS NS 187 265 NS NS NI NI NI NI NI NI NI NI NI NI NI NI NI Jul‐92 NS NS NS NS NS NS 567 NS NI NI NI NI NI NI NI NI NI NI NI NI NI Oct‐92 NS NS NS NS 363 860 NS 207 28 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐93NSNSNSNSNSNS829NS6 NINININININININININININI Apr‐93 NS NS NS NS NS 679 420 216 87 NI NI NI NI NI NI NI NI NI NI NI NI Jul‐93 NS NS NS NS NS NS 553 NS 92 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐93 NS 485 NS 46 357 822 NS 215 68 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐94 NS NS ND 3 NS NS 500 NS 89 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐94 NS 259 NS 40 233 375 NS 178 81 NI NI NI NI NI NI NI NI NI NI NI NI Jul‐94 14 NS 1 NS NS NS 576 NS 86 NI NI NI NI NI NI NI NI NI NI NI NI Oct ‐94 NS 432 NS 57 273 407 NS 215 92 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐95 16 NS ND NS NS NS 234 NS 69 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐95 NS 506 NS 58 230 583 NS 187 68 NI NI NI NI NI NI NI NI NI NI NI NI Jul‐95 32 NS ND NS NS NS 255 NS 62 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐95 NS 343 NS 56 169 540 NS 187 72 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐96 13 431 ND 48 228 609 228 165 63 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐96 NS 504 NS NS 157 578 253 145 53 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐97 15 320 ND 53 291 781 210 150 49 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐97 17 318 2 41 237 771 215 163 45 NI NI NI NI NI NI NI NI NI NI NI NI Apr‐98 NS NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Oct‐98 NS NS NS NS NS 606 NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Oct‐99 NS NS NS NS 348 738 282 199 61 NI NI NI NI NI NI NI NI NI NI NI NI Jan‐00 NS NS NS NS NS 640 NS 173 NS NI NI NI NI NI NI NI NI NI NI NI NI Mar‐00 NS NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Jun‐00 NS NS NS NS NS NS NS NS NS NI NI NI NI NI NI NI NI NI NI NI NI Oct‐00 NS NS NS NS 317 509 187 146 45 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐01 NS NS NS NS 317 475 217 153 47 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐02 NS NS NS NS 363 421 167 164 61 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐03 NS NS NS NS 320 276 237 151 62 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐04 NS NS NS NS 275 291 207 129 57 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐05 146 315 0.8 140 200 187 196 125 63 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐06 138 308 ND 117 229 170 226 134 57 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐07 106 330 ND 65 165 169 246 116 50 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐08 126 226 2.6 181 254 124 247 117 53 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐09 135 220 1.4 240 225 133 151 132 53 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐10 99 179 ND 185 200 148 157 101 46 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐11 136 169 1.6 249 401 211 131 99 45 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐12 131 176 ND 233 378 277 135 116 48 NI NI NI NI NI NI NI NI NI NI NI NI Oct/Nov‐13 134 169 2.1 167 317 205 141 112 52 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐14 116 161 1.0 177 224 122 148 123 43 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐15 127 212 ND 169 310 153 134 114 41 NI NI NI NI NI NI NI NI NI NI NI NI Oct‐16 99 238 74 2.5 92 108 124 42 30 3.7 32 14 Oct‐17 62 142 16 1.5 77 85 110 34 46 9.0 16 37 Oct‐18 88 156 20 5.4 98 96 105 51 43 6.1 35 102

ND Not Detected NI Not Installed NS Not Sampled Well Destroyed HALEY & ALDRICH, INC. \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\2_915 DeGuigne Drive\Deliverables\Five‐Year Report\2019_Five‐Year Review Report\5_appendix B‐historical VOC\Appendix B_915 Historical.xls JANUARY 2019 TABLE B‐3 Page 2 of 4 HISTORICAL TOTAL VOLATILE ORGANIC COMPOUND CONCENTRATIONS 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

Concentrations reported in micrograms per liter (µg/L) A‐Zone Wells Date 1‐S2‐S3‐S4‐S8‐S9‐S11‐S12‐S18‐S19‐S24‐S31‐S40‐S41‐S49‐S53‐S54‐S55‐S56‐S57‐S Jan‐91 NS NS NS NS NS 5 14 NS NS NS NS NS NS NI NI NI NI NI Apr‐91 NS NS NS NS NS NS NS NS NS NS 62 NS 522 NI NI NI NI NI Jul‐91 NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Oct‐91 NS NS NS NS NS NS NS NS NS NS 60 NS 740 NI NI NI NI NI Jan‐92NSNS1 NS NS10NSNSNSNSNSNSNSNININININI Apr‐92 NS NS NS NS NS NS NS NS NS NS 26 NS 764 NI NI NI NI NI Jul‐92 NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Oct‐92 NS NS NS NS NS NS NS NS NS NS 48 NS 1043 NI NI NI NI NI Jan‐93 ND NS ND 123 NS NS NS NS NS 5 13 NS 911 NI NI NI NI NI Apr‐93 ND NS ND 148 ND 1 NS NS NS 72 39 143 655 NI NI NI NI NI Jul‐93 ND NS ND 151 NS 3 NS NS NS 111 70 NS 771 NI NI NI NI NI Oct‐93 NS NS ND 149 NS NS NS NS NS 51 NS NS 807 NI NI NI NI NI Jan‐94 ND ND ND 116 NS NS NS NS NS 40 NS NS NS NI NI NI NI NI Apr‐94 ND NS ND 139 NS NS NS NS NS 31 46 NS NS NI NI NI NI NI Jul‐94 ND NS ND 119 NS NS NS NS NS 66 NS NS 596 NI NI NI NI NI Oct‐94NDNSND 149 2NSNSNSNS71NS20NSNININININI Jan‐95 ND NS ND 111 NS NS NS NS 14 26 NS 119 NS NI NI NI NI NI Apr‐95 ND NS ND 129 1 NS NS NS NS 47 NS 236 NS NI NI NI NI NI Jul‐95 ND NS ND 79 NS NS NS NS NS 70 48 111 433 NI NI NI NI NI Oct‐95 ND NS 1 123 NS NS NS NS NS 30 NS 57 NS NI NI NI NI NI Apr‐96 ND NS ND 90 ND NS NS NS NS 29 26 262 420 NI NI NI NI NI Oct‐96 NS NS NS NS NS NS NS NS NS NS NS 156 700 NI NI NI NI NI Apr‐97 ND NS ND 127 ND NS NS NS NS 37 21 248 426 NI NI NI NI NI Oct‐97 1 NS 1 105 NS NS NS NS NS 23 NS 232 NS NI NI NI NI NI Apr‐98 NS 26 NS NS ND NS 1 NS NS NS 14 83 NS NI NI NI NI NI Oct‐98 1 NS ND 273 1 NS NS NS NS 58 25 174 374 NI NI NI NI NI Oct‐99 ND NS ND 220 NS NS NS NS NS 162 18 271 525 NI NI NI NI NI Jan‐00 NS NS NS NS NS NS NS NS NS 87 NS NS NS NI NI NI NI NI Mar‐00 NS NS NS NS NS NS NS NS NS 94 NS NS NS NI NI NI NI NI Jun‐00 NS NS NS NS NS NS NS NS NS NS NS NS NS NI NI NI NI NI Oct‐00 1.0 NS 1.0 109 1.0 NS NS NS NS NS NS 281 575 NI NI NI NI NI Oct‐01 1.8 NS 0.8 87 1.5 NS 0.9 DRY NS 127 DRY 367 567 NI NI NI NI NI Oct/Nov‐02 1.0 NS 1.0 247 1.0 NS 2.0 DRY NS 147 37 395 352 NI NI NI NI NI Oct‐03 ND NS ND 226 ND NS ND DRY NS 147 24 436 106 NI NI NI NI NI Oct‐04 1.1 182 0.8 60 0.9 NS 2.2 3.3 NS 83 234 141 72 NI NI NI NI NI Oct‐05 1.1 110 ND 32 1.5 NS 3.1 51 NS 96 351 343 55 NI NI NI NI NI Oct‐06 1.0 164 ND 25 1.4 NS 9.6 52 NS 118 342 462 41 NI NI NI NI NI Oct‐07 1.0 216 0.7 24 1.7 NS 6.9 31 NS 124 319 409 36 NI NI NI NI NI Oct‐08 0.7 207 1.1 19 1.5 NS 9.1 77 NS 120 249 576 32 NI NI NI NI NI Oct‐09 0.7 169 0.8 13 1.8 NS 8.4 27 NS 97 275 387 50 NI NI NI NI NI Oct/Nov‐10 0.6 176 0.7 17 2.4 NS 8.2 33 NS 75 257 411 29 NI NI NI NI NI Oct/Nov‐11 0.6 140 1.4 22 2.0 NS 9.2 45 NS 104 168 387 23 NI NI NI NI NI Oct/Nov‐12 0.6 146 8 17 1.5 NS 7.6 37 NS 109 161 401 30 NI NI NI NI NI Oct/Nov‐13 0.6 165 13 17 1.8 NS 6.7 50 NS 93 179 367 44 NI NI NI NI NI Oct‐14 0.5 138 14 11 1.2 NS 3.0 30 NS 83 166 52 36 NI NI NI NI NI Oct‐15 0.6 116 15 5.8 0.7 NS 3.4 39 NS 83 166 197 49 NI NI NI NI NI Oct‐16 NS NS 115 329 NS 122 103 11 NI NI Oct‐17 105 55 85 276 25 111 81 5.0 6.5 0.4 Oct‐18 NS 69 89 96 29 97 123 3.3 51 ND

ND Not Detected NI Not Installed NS Not Sampled Well Destroyed HALEY & ALDRICH, INC. \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\2_915 DeGuigne Drive\Deliverables\Five‐Year Report\2019_Five‐Year Review Report\5_appendix B‐historical VOC\Appendix B_915 Historical.xls JANUARY 2019 TABLE B‐3 Page 3 of 4 HISTORICAL TOTAL VOLATILE ORGANIC COMPOUND CONCENTRATIONS 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

Concentrations reported in micrograms per liter (µg/L) A/B1‐Zone Wells B1‐Zone Wells B2‐Zone Wells Date 6‐S/D 7‐S/D 9‐D10‐D19‐D20‐D24‐D31‐D40‐D41‐D49‐DR* 51‐D52‐D56‐D57‐D11‐DD 18‐DD 20‐DD 32‐DD 42‐DD Jan‐91 NS 1250 65 54 NS NS NS 62 3120 5 NS NI NI NI 13 200 139 390 3 Apr‐91 59 NS 37 NS 760 73 85 65 2220 7 ND NI NI NI 14 98 47 502 3 Jul‐91 NS 919 61 84 NS NS NS 85 4910 9 NS NI NI NI 47 27 137 546 9 Oct‐91 80 NS 54 NS 440 100 88 102 1310 6 7 NI NI NI 7 58 106 708 9 Jan‐92 NS 890 63 NS NS NS NS 74 1340 6 NS NI NI NI 11 83 86 640 21 Apr‐92 61 NS 65 NS 370 91 127 119 714 7 3 NI NI NI 8 86 290 436 11 Jul‐92 NS 968 66 101 NS NS NS 107 1122 11 NS NI NI NI 13 78 334 845 61 Oct‐92 86 NS 76 NS 271 97 108 235 1133 18 1 NI NI NI 13 17 159 447 60 Jan‐93 NS 1865 NS NS NS NS NS NS 2817 NS NS NI NI NI NS 36 136 NS NS Apr‐93 NS NS 181 263 670 115 98 291 2313 6 ND NI NI NI 6 73 134 520 13 Jul‐93 NS 352 NS NS NS NS NS NS 1189 NS NS NI NI NI NS 65 658 NS NS Oct‐93 74 NS NS NS 570 NS 64 NS 1383 NS NS NI NI NI NS 150 541 598 NS Jan‐94 NS 641 NS NS NS NS NS NS 1731 NS NS NI NI NI NS 46 408 NS NS Apr‐94 54 NS 113 53 242 44 90 213 868 6 ND NI NI NI 1 52 378 605 22 Jul‐94 NS 532 NS NS NS NS NS NS 799 NS NS NI NI NI NS 42 451 NS NS Oct‐94 NS NS NS NS 444 NS 68 NS 55 NS NS NI NI NI NS 51 211 520 NS Jan‐95 NS 422 NS NS NS NS NS NS 632 NS NS NI NI NI NS 28 90 NS NS Apr‐95 78 NS 159 133 353 82 76 137 547 4 1 NI NI NI 13 16 514 389 192 Jul‐95 NS 697 NS NS NS NS NS NS 554 NS NS NI NI NI NS 19 555 NS NS Oct‐95 NS NS NS NS 600 NS 73 NS 760 NS NS NI NI NI NS 11 220 382 NS Apr‐96 62 413 160 101 403 54 59 94 360 10 ND NI NI NI 3 12 136 326 176 Oct‐96 NS 845 NS NS 176 NS NS NS 905 NS NS NI NI NI NS 19 NS 228 NS Apr‐97 35 406 244 83 56 51 61 81 525 10 ND NI NI NI 3 14 312 266 160 Oct‐97 70 177 229 141 349 38 70 80 207 7 ND NI NI NI 16 14 225 269 304 Apr‐98 NS NS 120 NS NS NS NS NS 152 NS NS NI NI NI NS NS NS NS 250 Oct‐98 NS NS 255 98 212 NS NS 109 281 9 ND NI NI NI 6 10 147 268 231 Oct‐99 NS NS 228 92 347 NS NS 90 287 7 ND NI NI NI 66 119 211 234 323 Jan‐00 NS NS NS NS NS NS NS NS NS NS NS NI NI NI NS 109 NS NS 260 Mar‐00 NS NS NS NS NS NS NS NS NS NS NS NI NI NI ND 8 NS NS 300 Jun‐00 NS NS NS NS NS NS NS NS NS NS NS NI NI NI NS ND NS NS NS Oct‐00 NS NS 247 100 277 NS NS 139 253 7.0 ND NI NI NI 6.0 83 453 204 416 Oct‐01 NS NS 283 104 168 NS NS 140 301 6.0 1.8 NI NI NI 9.1 59 435 247 395 Oct/Nov‐02 NS NS 316 85 359 NS NS 128 334 8.0 1.0 NI NI NI 7.0 14 315 293 437 Oct‐03 NS NS 326 68 334 NS NS 135 344 5.8 ND NI NI NI 24 5.1 329 266 452 Oct‐04 NS NS 343 9.0 198 NS NS 80 316 7.7 ND NI NI NI 31 10 368 205 434 Oct‐05 NS NS 310 3.0 101 NS NS 198 334 3.8 ND NI NI NI 58 57 347 297 106 Oct‐06 NS NS 379 5.5 22 NS NS 122 365 4.1 ND NI NI NI 64 12 230 371 427 Oct‐07 NS NS 432 9.2 9.3 NS NS 137 391 3.1 ND NI NI NI 23 8.8 258 226 372 Oct‐08 NS NS 335 17 16 NS NS 108 427 1.0 ND NI NI NI 24 29 218 201 415 Oct‐09 NS NS 370 33 10 NS NS 140 443 2.3 ND NI NI NI 18 16 169 176 379 Oct/Nov‐10 NS NS 432 30 58 NS NS 93 537 2.6 ND NI NI NI 56 46 255 191 432 Oct/Nov‐11 NS NS 382 32 184 NS NS 126 418 2.5 ND NI NI NI 30 14 229 200 337 Oct/Nov‐12 NS NS 377 36 267 NS NS 108 394 1.8 ND NI NI NI 39 10 250 161 371 Oct/Nov‐13 NS NS 348 44 204 NS NS 123 387 1.1 ND NI NI NI 40 48 206 170 313 Oct‐14 NS NS 381 40 240 NS NS 119 187 1.2 ND NI NI NI 63 37 166 200 380 Oct‐15 NS NS 334 53 56 NS NS 118 168 6.7 ND NI NI NI 3.9 43 85 173 147 Oct‐16 NS NS 232 346 2.0 1.5 NI NI Oct‐17 249 23 186 347 2.4 2.1 95 150 Oct‐18 NS 70 87 262 ND 0.57 181 181

ND Not Detected NI Not Installed NS Not Sampled Well Destroyed * 49‐DR replaced 49‐D in 2018. HALEY & ALDRICH, INC. \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\2_915 DeGuigne Drive\Deliverables\Five‐Year Report\2019_Five‐Year Review Report\5_appendix B‐historical VOC\Appendix B_915 Historical.xls JANUARY 2019 TABLE B‐3 Page 4 of 4 HISTORICAL TOTAL VOLATILE ORGANIC COMPOUND CONCENTRATIONS 915 DEGUIGNE DRIVE SUNNYVALE, CALIFORNIA

Concentrations reported in micrograms per liter (µg/L) B2‐Zone Wells B3‐Zone Well Date 43‐DD 44‐DD 45‐DD 49‐DD 53‐DD 54‐DD 56‐DD 57‐DD 50‐DDD Jan‐91 66 2 2 ND NI NI NI NI NS Apr‐91 79 1 17 8 NI NI NI NI ND Jul‐91 79 1 15 0 NI NI NI NI NS Oct‐91 110 0 10 1 NI NI NI NI 1 Jan‐92 68 1 18 0 NI NI NI NI NS Apr‐92 52 ND 35 5 NI NI NI NI 1 Jul‐92615 85NDNININININS Oct‐92 43 3 27 1 NI NI NI NI ND Jan‐93 NS NS 34 NS NI NI NI NI NS Apr‐93762 33NDNININININD Jul‐93 NS NS 18 NS NI NI NI NI NS Oct‐93433 16NSNINININI2 Jan‐94 NS ND 14 NS NI NI NI NI NS Apr‐94 30 ND ND ND NI NI NI NI ND Jul‐94NSNS5NSNININININS Oct‐94 26 ND 10 NS NI NI NI NI ND Jan‐95NSNS9NSNININININS Apr‐95 21 3 6 1 NI NI NI NI ND Jul‐95NSNS7NSNININININS Oct‐9527ND9NSNININININD Apr‐9616ND1NDNININININD Oct‐ 9618ND1NSNININININS Apr‐9713ND2NDNININININD Oct‐97 12 ND 3 1 NI NI NI NI ND Apr‐98 NS NS NS NS NI NI NI NI NS Oct‐98 7 NS 8 ND NI NI NI NI ND Oct‐999NSNDNDNININININD Jan‐00 NS NS NS NS NI NI NI NI NS Mar‐00 NS NS NS NS NI NI NI NI NS Jun‐00 NS NS NS NS NI NI NI NI NS Oct‐00 7.0 NS 1.0 ND NI NI NI NI ND Oct‐016.8NSNDNDNININININD Oct/Nov‐029.0NS13NDNININININD Oct‐035.4NSNDNDNININININD Oct‐043.9NSNDNDNININININD Oct‐053.3NSNDNDNININININD Oct‐067.0NSNDNDNININININD Oct‐073.4NSNDNDNININININD Oct‐083.4NSNDNDNININININD Oct‐092.9NSNDNDNININININD Oct/Nov‐102.5NSNDNDNININININD Oct/Nov‐11 2.7 NS 0.8 ND NI NI NI NI ND Oct/Nov‐123.8NSNDNDNININININD Oct/Nov‐13 2.4 NS 2.0 ND NI NI NI NI ND Oct‐14 1.7 NS 0.6 ND NI NI NI NI ND Oct‐15 3.1 NS 3.6 ND NI NI NI NI ND Oct‐16 NS 1.9 ND 167 ND NI NI Oct‐17 NS 2.0 ND 49 2.0 85 7.4 Oct‐18 NS 1.6 14 36 1.2 84 0.82

ND Not Detected NI Not Installed NS Not Sampled Well Destroyed HALEY & ALDRICH, INC. \\haleyaldrich.com\share\oak_common\Advanced Micro Devices\2_915 DeGuigne Drive\Deliverables\Five‐Year Report\2019_Five‐Year Review Report\5_appendix B‐historical VOC\Appendix B_915 Historical.xls JANUARY 2019

APPENDIX C

Concentrations Trends from 2014 Five‐Year Review Report

2-S 8-S 19-S 11-S 10,000 10,000 10,000 10,000 .. 1,000 1,000 1,000 1,000 - ...... •••• 100 .. 100 ~.. ·...... 100 .. 100 • •••••••• .. , - .. •• ...... ■ ... • ••••• ~ · ...... • 1-S 10 • 10 10 .. 10 ·...... 10,000

Concentration (µg/L)Concentration (µg/L)Concentration ••• (µg/L)Concentration .. (µg/L)Concentration 40-S .. .. • .. .. 10,000 .. .. 1 1 1 .. 1 .. •• 1,000

1,000 (: ND0.1 I I 11 I I I ND0.1 8-SGRAPH11 I I 11 I I ND0.1 1.. • 11 I I I 11 I I I I I I .. ~ ~ I I I ND0.1 • 2-SGRAPH 100 ...... 19-SGRAPH .. 11-SGRAPH 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014

.. 1984 1986 1988 2000 2002 2004 1984 1986 1988 2000 2002 2004 1984 1986 1988 2000 2002 2004 1984 1986 1988 2000 2002 2004 100 ...... - ...... •• • ••• 10 "',to...... • •• Sampling Date Sampling Date Sampling Date Sampling Date ...... (µg/L)Concentration 1-SGRAPH 10 • .. •• 1

Concentration (µg/L)Concentration • .. •• •• 1 • 40-SGRAPH E DUANE AVE • • ND0.1 I 11 11-S ND0.1 I I I I 11 11 I I 11 I I I A@ 1 i 1 19-S @ 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 ~ A@ A 1984 1986 1988 2000 2002 2004 Sampling Date A@ 18-S 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 Sampling Date 2-S EW-1 EW-2 EW-3 A@ D" D" D" 1-S

18-S EW-5 D" 10,000 EW-6 A@ D" A@ 1,000 49-S A@ 31-S 10,000 40-S 8-S 100 .. ,. 1,000 .. J, .., ..... 10 ... . . 915 DEGUIGNE .. DRIVE .. Concentration (µg/L)Concentration ._ 100 DEGUIGNE DR ...... I 1 ...... ■ ...... ■ 49-S 18-SGRAPH 49-SGRAPH A@ 10 ~...... • ~.. J!o,...... • l------~~,_-~-~~~=-=-=-=-=--==-- •• ••• ND0.1 Concentration (µg/L)Concentration

1 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 Sampling Date 3-S ND0.1 - ~---,-,---,-----,-I I 1 I ,1I TT1 1-Tll- 1,----,1fl 11 Tl ---. -1 I 1 A@ 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 Sampling Date SUBMICRON DEVELOPMENT 31-S CENTER 10,000 A@ 41-S 3-S I 10,000 1,000 I 31-SGRAPH ■ •••••••••• 1,000 100 41-S 3-SGRAPH • • •• • 10,000 .. .. 100 10 ...... 1,000 .. .. (µg/L)Concentration .. .. 41-SGRAPH ...... = 10 • 1 ... ~ ...... ~ I ...... ••. ... . P----fl .. • 100 ...... • (µg/L)Concentration ••• • • ND0.1 j======ij 1 •• •• ■ ...... ' . 10 - ______:__ __ _ 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004

Concentration (µg/L)Concentration ND0.1 Ii'======:;~ Sampling Date 1 • 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 Sampling Date ND0.1 ======::;=;--L_-=--=--=-----=----=----=----=-- --=----=----=---=-- 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 Sampling Date I~ \

915 DEGUIGNE DRIVE □ HALEY& SUNNYVALE, CALIFORNIA .... TCE LEGEND ALDRIOI ■ cDCE A@ A-ZONE MONITORING WELL SITE BOUNDARY Cleanup Goal for TCE D" EXTRACTION WELL CURRENT ON-SITE BUILDING CONCENTRATION TRENDS FOR Cleanup Goal for cDCE © A-ZONE WELLS APPROXIMATE EXTENT OF OTHER BUILDING TCE = TRICHLOROETHENE EXCAVATION AT FORMER PAD C 0 150 300 cDCE = CIS-1,2-DICHLOROETHENE ACID NEUTRALIZATION SYSTEM 1 INCH = 150 FEET SCALE: AS SHOWN µg/L - MICROGRAMS PER LITER OCTOBER 2013 FIGURE 7 G:\39751_AMD_Former 901-902Thompson Place\GIS\Figures_201311\915_DeGuigne_Fig_07_A-Zone.mxd -- 1/17/2014 1:50:18 PM -- craumann 40-D 10-D 19-D 10,000 10,000 10,000

1,000 1,000 1,000 •••••••• .. ..,...... •• • .. .. 100 100 411..._. • ...... • .... 100 ,..,...... ~ - ■--■■ ...... • •••• ...... ••• • • .. 10 10 ~,: 10 ...... ~ ...... • Concentration (µg/L)Concentration (µg/L)Concentration (µg/L)Concentration .: ...... •• .. .. 1 1 .. 1 .. .. 10-DGRAPH ..

I I ND0.1 11 ND0.1 "'r"' I I 11 I I ND0.1 I t1I 11 I I j I I I I I 11 40-DGRAPH 19-DGRAPH 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 1984 1986 1988 2000 2002 2004 1984 1986 1988 2000 2002 2004 Sampling Date Sampling Date Sampling Date

49-D E DUANE AVE 10,000 20-D 19-D 10,000 A@ 1,000 1,000 .... A@ \]------□ ...... D 10-D EW-1 EW-3 ...... •1.;. • ...... 100 EW-2 ■ • ... •• ■ ...... D" if=D" D"r □ 100 ...... • .. .. • .... 10 • • ...... ■ ••• EW-5 10 "':'.. 1- • •• ··: • ~ .. ..

Concentration (µg/L)Concentration D"

••... • ■ • ...• ...... - ~- •••■ A@ (µg/L)Concentration • • ...... ■ 20-D EW-6 1 ...... 51-D • • D" 0- ·- ==t==:.======,:==--==t-11A@ -7 1 51-DGRAPH 49-DGRAPH A@ ND0.1 I I 11 • 1~ I 11 ~ 1 1 I I I"' I I ~ 40-D ND0.1 11 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 Sampling Date 915 DEGUIGNE Sampling Date DRIVE J DEGUIGNE DR 49-D A@

41-D 51-D 10,000 10,000

SUBMICRON 1,000 DEVELOPMENT 1,000 CENTER 100 41-DGRAPH.. A@ 41-D 100 • •• I 10 • I 10 20-DGRAPH Concentration (µg/L)Concentration I (µg/L)Concentration .. .. 1 • .I ~ 1 ......

ND0.1 I I 11 I I 11 ND0.1 I =

1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 p 1984 1986 1988 2000 2002 2004 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 fl 1984 1986 1988 2000 2002 2004 Sampling Date Sampling Date j ij !J ~ IL______.I = IL_____..--.!

915 DEGUIGNE DRIVE □ HALEY& SUNNYVALE, CALIFORNIA .... TCE LEGEND ALDRIOI ■ cDCE A@ B1-ZONE MONITORING WELL SITE BOUNDARY Cleanup Goal for TCE D" EXTRACTION WELL CURRENT ON-SITE BUILDING CONCENTRATION TRENDS FOR Cleanup Goal for cDCE © B1-ZONE WELLS APPROXIMATE EXTENT OF OTHER BUILDING TCE = TRICHLOROETHENE EXCAVATION AT FORMER PAD C 0 150 300 cDCE = CIS-1,2-DICHLOROETHENE ACID NEUTRALIZATION SYSTEM 1 INCH = 150 FEET SCALE: AS SHOWN µg/L - MICROGRAMS PER LITER OCTOBER 2013 FIGURE 8 G:\39751_AMD_Former 901-902Thompson Place\GIS\Figures_201311\915_DeGuigne_Fig_08_B1-Zone.mxd -- 1/17/2014 1:50:49 PM --craumann 42-DD 45-DD 10,000 10,000

1,000 1,000

•••...... ••····•·· 100 100 ...... 10 .... 10 t •\.., .. :--~~~t----:...:-- - :.---- ..

Concentration (µg/L)Concentration (µg/L)Concentration +------:... 1 1 .. .. 43-DD 45-DDGRAPH 10,000 ND0.1 I I I ... I I ,.I I I "' 1 I j I I j I I I j I E ND0.1 42-DDGRAPH V ,,.,-I

LA

E

U 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 1984 1986 1988 2000 2002 2004

1,000 ...... IJI,,. .. G 45-DD I A@ ...... Sampling Date M Sampling Date

... N

A 11-DD

S 100 SAN LUISITOWAY 10,000

SANAVEPATRICIO

SANTA PAULA AVE PAULA SANTA

SAN PEDRO AVE SANPEDRO

E DUANE AVE 10 .. 1,000

Concentration (µg/L)Concentration 42-DD EW-8 EW-9 D" 11-DD A@D" 1 • A@ A@ 100 43-DDGRAPH 43-DD 18-DD .. A@ .. .. . 11-DDGRAPH...... ~ ND0.1 10 ...... • ..... , .. •• Concentration (µg/L)Concentration .. .. 1-- ... 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014

1984 1986 1988 2000 2002 2004 0 1 • • Sampling Date EW-7 .. • 20-DD A@D" A@ 32-DD ND0.1 I ., i i I I i ·r r"., ,. i i I i i I I I 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 Sampling Date 20-DD 10,000 J,-----~~_i_ 18-DD 915 DEGUIGNE 10,000 1,000 20-DDGRAPH DRIVE ------DEGUIGNE DR •w ...... 49-DD ... Ii: ...... 1,000 100 ..4 ,. -c.. ••• •••• ~ ••• A@ '\.• ~ ...... 41...... 100 41. 10 ...... ~ .. .. 18-DDGRAPH...... ~ Concentration (µg/L)Concentration ...... • ...... 10 ...... 1 D "· ...... • .. Concentration (µg/L)Concentration .. • • • v • I • 1 .... • ND0.1 .... SUBMICRON

DEVELOPMENT ND0.1 I I 11 I I I I I 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 I I i i i i i~ i 1984 1986 1988 2000 2002 2004 Ir CENTER Sampling Date 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 I Sampling Date I I 32-DD 49-DD 10,000 10,000 . ~ 1,000 1,000 1 ...... 49-DDGRAPH = ~...... p J ...... ~ ...... fl 32-DDGRAPH. ... 100 100 ...... •.·· ... j ij .... • •• • • •• 10 .. • 10 .. Concentration (µg/L)Concentration

Concentration (µg/L)Concentration .. !J ~ 1 - 1 .... I I ...... =

ND0.1 I I I j I I I j I I I j I I j I I I ND0.1 1982 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1984 1986 1988 2000 2002 2004 1990 1992 1994 1996 1998 2006 2008 2010 2012 2014 1982 1984 1986 1988 2000 2002 2004 Sampling Date Sampling Date I I

915 DEGUIGNE DRIVE □ HALEY& SUNNYVALE, CALIFORNIA .... TCE LEGEND -- "J ALDRIOI ■ cDCE A@ B2-ZONE MONITORING WELL I_ . SITE BOUNDARY Cleanup Goal for TCE CONCENTRATION TRENDS FOR D" EXTRACTION WELL CJ CURRENT ON-SITE BUILDING Cleanup Goal for cDCE © B2-ZONE WELLS APPROXIMATE EXTENT OF CJ OTHER BUILDING TCE = TRICHLOROETHENE EXCAVATION AT FORMER PAD C 0 150 300 cDCE = CIS-1,2-DICHLOROETHENE ACID NEUTRALIZATION SYSTEM 1 INCH = 150 FEET SCALE: AS SHOWN µg/L - MICROGRAMS PER LITER OCTOBER 2013 FIGURE 9 G:\39751_AMD_Former 901-902Thompson Place\GIS\Figures_201311\915_DeGuigne_Fig_09_B2-Zone.mxd -- 1/17/2014 1:51:27 PM --craumann

APPENDIX D

Title Search and Deed Restriction

915 DEGUIGNE DRIVE 915 DE GUIGNE DRIVE

SUNNYVALE, CA

Inquiry Number: 5501088.1S DECEMBER 6, 2018

EDR Environmental Lien and AUL Search

6 Armstrong Road, 4th floor Shelton, CT 06484 Toll Free: 800.352.0050 www.edrnet.com

~EDR"

EDR Environmental Lien and AUL Search

The EDR Environmental Lien Search Report provides results from a search of available current land title records for environmental cleanup liens and other activity and use limitations, such as engineering controls and institutional controls.

A network of professional, trained researchers, following established procedures, uses client supplied address information to:  search for parcel information and/or legal description;  search for ownership information;  research official land title documents recorded at jurisdictional agencies such as recorders' offices, registries of deeds, county clerks' offices, etc.;  access a copy of the deed;  search for environmental encumbering instrument(s) associated with the deed;  provide a copy of any environmental encumbrance(s) based upon a review of key words in the instrument(s) (title, parties involved, and description); and  provide a copy of the deed or cite documents reviewed.

Thank you for your business. Please contact EDR at 1-800-352-0050 with any questions or comments.

Disclaimer - Copyright and Trademark Notice This report was prepared for the use of Environmental Data Resources, Inc., and AFX Research, LLC. (AFX) exclusively. This report is neither a guarantee of title, a commitment to insure, or a policy of title insurance. NO WARRANTY, EXPRESSED OR IMPLIED, IS MADE WHATSOEVER IN CONNECTION WTH THIS REPORT. Environmental Data Resources, Inc. (EDR) and AFX exclusively specifically disclaim the making of any such warranties, including without limitation, merchantability or fitness for a particular use or purpose. The information contained in this report is retrieved as it is recorded from the various agencies that make it available. The total liability is limited to the fee paid for this report.

Copyright 2016 by Environmental Data Resources, Inc. All rights reserved. Reproduction in any media or format, in whole or in part, of any report or map of Environmental Data Resources, Inc., or its affiliates, is prohibited without prior written permission. EDR and its logos are trademarks of Environmental Data Resources, Inc. or its affiliates. All other trademarks used herein are the property of their respective owners.

EDR Environmental Lien and AUL Search

TARGET PROPERTY INFORMATION

ADDRESS

915 DEGUIGNE DRIVE 915 DE GUIGNE DRIVE SUNNYVALE, CA

RESEARCH SOURCE

Source 1: SANTA CLARA, CA COUNTY RECORDER'S OFFICE

Source 2: CALIFORNIA ENVIRONMENTAL PROTECTION AGENCY

Source 3: UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

PROPERTY INFORMATION

Deed 1 Type of Deed: GRANT DEED Title is vested in: LS-SUNNYVALE LLC Title received from: WATT INVESTMENTS AT SUNNYVALE, LLC Date Executed: NA Date Recorded: 02/22/2016 Book: NA Page: NA Volume: NA Instrument#: 23224910 Docket: NA Land Record Comments: NA Miscellaneous Comments: NA

Legal Description: TRACT 10358 THE VALE BOOK 897 LOT 1

Current Owner: LS-SUNNYVALE LLC

Property Identifiers: 205-21-011

Comments: NA

EDR Environmental Lien and AUL Search

ENVIRONMENTAL LIEN

Environmental Lien: Found Not Found X

□ □ If Found:

1st Party: NA 2nd Party: NA

Dated: NA Recorded: NA Book: NA Page: NA Docket: NA Volume: NA Instrument #: NA Comments: NA Miscellaneous: NA

OTHER ACTIVITY AND USE LIMITATIONS (AULS)

Other AUL's: Found Not Found X

□ □ If Found:

1st Party: NA 2nd Party: NA

Dated: NA Recorded: NA Book: NA Page: NA Docket: NA Volume: NA Instrument #: NA Comments: NA Miscellaneous: NA

EDR Environmental Lien and AUL Search

MISCELLANEOUS

Type of Instrument: NONE IDENTIFIED First Party: Second Party: Date Executed: Date Recorded: Instrument #: Book: Page: Comments:

DOCUMENT: 23224910 Pages: 4 RECORDING REQUESTED BY Fees. 24.00 FIRST AMERICAN TITLE 1111111111111111111 Taxes. 204600.00 0, ~ J-f, 2-{30(L ~ nCopies RECORDmG REQUESTED BY AMT PAID 204624.00 AND WHEN RECORDED MAIL REGINA ALCOMENDRAS THIS GRANT DEED AND ALL ROE# 025 TAX STATEMENTS TO: SANTA CLARA COUNTY RECORDER 2/22/2016 Recorded at the request of 1: 11 PM LS-Sunnyvale LLC Recording Service Attn: Greg Ocasek 18881 Von Karman Ave, Suite 1450 Irvine, California 92612

(Space Above For Recorder's Use)

The undersigned grantor(s) declare(s): Documentary Transfer Tax is $ Q..oy ,(# 00, 00 \}(" Computed on full value of property conveyed, or □ Computed on full value less value of liens and encumbrances remaining at time of sale. D Unincorporated area/ JiO City of Sunnyvale

GRANT DEED

FOR A VALUABLE CONSIDERATION, receipt of which is hereby acknowledged, WATT INVESTMENTS AT SUNNYVALE LLC, a California limited liability company ("Grantor"), hereby grants to LS-SUNNYVALE LLC, a California limited liability company ("Grantee"), the following described real property (the "Land") located in the City of Sunnyvale, Santa Clara County, California:

SEE EXHIBIT A

SUBJECT TO: all matters of record affecting the real property described in Exhibit A attached hereto and made a part hereof, and all matters that would be disclosed by an accurate survey of the Land.

[SIGNATURE PAGE FOLLOWS]

[MAIL TAX STATEMENTS TO RETURN ADDRESS ABOVE]

073907\7464323v2 1 IN WITNESS WHEREOF, Grantor has executed this Grant Deed on the day and year hereafter written.

Dated: ~ X) ~ J. 2016 GRANTOR:

073907\7464323v2 2 A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document.

STATE OF CALIFORNIA ) ) ss COUNTY OF lo~ flv1e-/e.s, )

On ££" .e u" iii', JI. , 20 /l. before me, '"u• ;.,! Ill. p,..,,,;J (here insert name of the ocer), Notary Public, personally appeared l'1 Aw. F~ P Al I< who proved to me on the basis of satisfactory evidence to be the person(Jl) whose name(jit) is/aM­ subscribed to the within instrument and acknowledged to me that he/sje/thilJy executed the same in his~thfir authorized capacity(~). and that by hisfhl;f:.lth!Mr signature~ on the instrument the person(6,6, or the entity upon behalf of which the person(Jt) acted, executed the instrument.

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

[Seal]

073907\7464323v2 3 EXHIBIT "A"

LEGAL DESCRIPTION OF THE LAND

Real property in the City of Sunnyvale, County of Santa Clara, State of California, described as follows:

PARCEL ONE:

ALL OF PARCEL A, AS SHOWN UPON THAT CERTAIN PARCEL MAP FILED FOR RECORD IN THE OFFICE OF THE RECORDER OF THE COUNTY OF SANTA CLARA, STATE OF CALIFORNIA, ON NOVEMBER 30, 1973, IN BOOK 333 OF MAPS ON PAGE 30.

PARCEL ONE-A:

A NON-EXCLUSIVE EASEMENT FOR THE INSTALLATION, OPERATION, MAINTENANCE, REPAIR AND REPLACEMENT OF COMPUTER DATA AND TELECOMMUNICATIONS LINES AS GRANTED IN THAT CERTAIN EASEMENT AGREEMENT RECORDED JUNE 16, 1997, AS INSTRUMENT NUMBER 13741332, OFFICIAL RECORDS AND FIRST AMENDMENT TO EASEMENT AGREEMENT RECORDED MAY 20, 2005, AS INSTRUMENT NUMBER 18382724, OFFICIAL RECORDS.

PARCEL TWO:

LOT 18, AS SHOWN ON THAT CERTAIN MAP ENTITLED 'TRACT NO. 2421 INTERNATIONAL SOENCE CENTER", WHICH MAP WAS FILED FOR RECORD IN THE OFFICE OF THE RECORDER OF THE COUNTY OF SANTA CLARA, STATE OF CALIFORNIA, ON JULY 15, 1959 IN BOOK 108 OF MAPS, AT PAGES 53, 54, 55 AND 56.

EXCEPTING THEREFROM, ALL OIL, GAS AND OTHER HYDROCARBONS, GEOTHERMAL RESOURCES AS DEFINED IN SECTION 6903 OF THE CALIFORNIA PUBLIC RESOURCES CODE AND ALL OTHER MINERALS, WHETHER SIMILAR TO THOSE HEREIN SPEOFIED OR NOT, WITHIN OR THAT MAY BE PRODUCED FROM SAID REAL PROPERTY, AS RESERVED BY CHEVRON U.S.A., INC., A CORPORATION IN THE CORPORATION GRANT DEED RECORDED OCTOBER 6, 1978 IN BOOK E009 PAGE 544, OFFIOAL RECORDS.

AND FURTHER EXCEPTING, THE SOLE EXCLUSIVE RIGHT FROM TIME TO TIME TO DRILL AND MAINTAIN WELLS OR OTHER WORKS INTO OR THROUGH SAID REAL PROPERTY AND THE ADJOINING STREETS, ROADS AND HIGHWAYS BELOW A DEPTH OF FIVE HUNDRED (500) FEET AND TO PRODUCE, INJECT, STORE AND REMOVE FROM AND THROUGH SUCH WELLS OR WORKS, OIL, GAS, WATER AND OTHER SUBSTANCES OF WHATEVER NATURE, INCLUDING THE RIGHT TO PERFORM BELOW SAID DEPTH ANY AND ALL OPERATION DEEMED NECESSARY OR CONVENIENT FOR THE EXERCISE OF SUCH RIGHTS, AS RESERVED BY CHEVRON U.S.A., INC., A CORPORATION IN THE ABOVE REFERRED TO CORPORATION GRANT DEED RECORDED OCTOBER 6, 1978 IN BOOK E009 PAGE 544, OFFIOAL RECORDS. THE RIGHTS HEREINABOVE RESERVED BY CHEVRON U.S.A., INC., A CORPORATION IN THE ABOVE REFERRED TO DEED, DO NOT INCLUDE AND DO NOT EXCEPT OR RESERVE TO CHEVRON U.S.A., INC., A CORPORATION ANY RIGHT TO USE THE SURFACE OF SAID REAL PROPERTY OR FIRST FIVE HUNDRED (500) FEET BELOW SAID SURFACE OR TO CONDUCT ANY OPERATIONS THEREON OR THEREIN, ALL RIGHTS AND INTERESTS IN THE SURFACE OF SAID REAL PROPERTY.

A.P.N.: 205-21-001 and 205-21-002

073907\7464323v2 1 p:.::crn~DlNG f~tc,_;._:, . :_, - \ '1=1RST AMER ICf -\\'~ n n. .:

Accornrno clcd 1 0 ~1 23871705 Recording Requested By: Regina Alcomendras Santa Clara County - Clerk-Recorder 02/20/2018 01:59 PM

LS-Sunnyvale, LLC Ti ties: 1 Pages: 25 The Vale PA-1 Owner, LLC Fees : fl72.00 Taxes : 0 The Vale PA-2 Owner, LLC Total : 172 .00 c/o Landsea Holdings Company 7525 Irvine Center Drive, Suite 200 Irvine, CA 92618

And Arroyo Cap IV, LLC c/o Arroyo Capital, LLC 100 West Broadway, Suite 680 Long Beach, CA 90802

When Recorded, Mail To: Executive Officer California Regional Water Quality Control Board San Francisco Bay Region 1515 Clay Street, Suite 1400 Oakland, California 94612 GeoTracker # T10000003195; SL720051206; T10000010537

.COVENANT AND ENVIRONMENTAL RESTRICTION ON PROPERTY

THE VALE 915 DeGuigne, Sunnyvale, CA 94085

This Covenant and Environmental Restriction on Property (this "Covenant") is made as of the .'.t_Q_th day of F.e.-0 , 20.1! by LS-Sunnyvale, LLC, a California limited liability company, The Vale PA-1 Owner, LLC a California limited liability company, The Vale PA-2 Owner, LLC a California limited liability company, and Arroyo Cap IV, LLC, a Delaware limited liability company, ("Covenantors"), who are the Owners ofrecord of that certain property totaling approximately eighteen and half acres comprised of Assessor Parcel Numbers 205-21-2 and 14 through 17 (the "Burdened Property") for the benefit ofthe California Regional Water Quality Control Board for the San Francisco Bay Region (the "Water Board"), with reference to the following facts:

A. The Ownership of the Burdened Property. The Burdened Property consists often lots, Lots A-F and Lots 4-7, (described in Exhibit A) on a larger property that was formerly situated at 915 DeGuigne and is now commonly referred to as The Vale in the City of Sunnyvale, County of Santa Clara, State of California, which is more particularly described in Exhibit B attached hereto and incorporated herein by this reference (such property hereinafter referred

1 SIGNED IN COUNTERPART to as the "Vale Property"). As set forth on Exhibit C, the Vale Property is presently owned as follows:

LS-Sunnyvale, LLC: Lots A, B, C, D, E and F Taylor Morrison of California, LLC: Lots 1, 2 and 3 The Vale PA-1 Owner, LLC Lot4 The Vale PA-I Owner, LLC and Arroyo Cap IV, LLC: Lot7 The Vale PA-2 Owner, LLC and An·oyo Cap IV, LLC: Lots 5 and 6

B. Contamination of the Burdened Property. The Burdened Property and groundwater underlying the Vale Property contain hazardous materials. The Vale Property, including the Burdened Property, was previously owned by Advanced Micro Devices ("AMD"), who constructed industrial buildings on the Site in 1974. Prior to that development, the site was primarily used for agricultural purposes. AMD and related entities utilized the site as a semiconductor fabrication and research development facility from 1974 until approximately 2015.

The soil, soil vapor and groundwater at the Vale Property were contaminated by releases from an underground storage tank containing trichloroethylene ("TCE") formerly located in the northwest portion of the Vale Property, TCE and cis-1,2- dichloroethylene ("cis-1,2- DCE") affected groundwater has migrated from releases at offsite properties to the Vale Property. Other volatile organic compounds ("VOCs") detected in soil and groundwater have also been addressed or continue to be addressed by the remedial actions being implemented at the Vale Property, including at the Burdened Property.

Active remediation has been conducted at the Vale Property since 1982 and in accordance with a cleanup and abatement order from the Water Board since 1991. As part of its remediation efforts, and with the oversight of the Water Board, AMD owns, operates, and maintains a groundwater extraction and treatment system located in the nmthwestem corner of the Vale Property to remove VOCs from the groundwater. Remedial efforts also included the excavation ofVOC impacted soil in the central portion of the Site. Additionally, vapor mitigation systems (VMS) have been and/or shall be installed at the Vale Property, including the Burdened Property that will require operation and maintenance in order to remain effective.

Organochlorine pesticides detected in shallow soil from historical agricultural practices were excavated and encapsulated beneath the building pads of residential buildings within the Burdened Property. This area of the Vale Property, including the Burdened Property, is to remain undisturbed. A map identifying the location of the encapsulated- soil is contained on ExhibitD.

More infmmation regarding the Burdened Property, and the surrounding area, can currently be reviewed at the State Water Resources Control Board GeoTracker website at: https:// geotracker. waterboards.ca.gov/profile_report.asp? global_id=Tl 0000003195

C. Exposure Pathways. The contaminants addressed in this Covenant are present in soil, soil vapor, and groundwater on the Burdened Property. Without the mitigation measures

2 which have been performed on the Burdened Property, exposure to these contaminants could take place via inhalation, of chemically-affected soil vapor or ingestion of chemically­ affected groundwater. The risk of public exposure to the contaminants has been substantially lessened by the remediation and controls described herein.

D. Adjacent Land Uses and Population Potentially Affected. The Burdened Property is used for residential purposes and is adjacent to residential, educational, and commercial land uses.

E. Full and voluntary disclosure to the Water Board of the presence of hazardous materials on the Burdened Property has been made and extensive sampling of the Burdened Property has been conducted.

F. Covenantors desire and intend that in order to benefit the Water Board, and to protect the present and future public health and safety, the Burdened Property shall be used in such a· manner as to avoid potential harm to persons or property that may result from hazardous materials that may have been deposited on portions of the Burdened Property.

ARTICLE I GENERAL PROVISIONS

1.1 Provisions to Run with the Land. This Covenant sets forth protective provisions, covenants, conditions and restrictions (collectively .referred to as "Restrictions") upon and subject to which the Burdened Property and every portion thereof shall be improved, held, used, occupied, leased, sold, hypothecated, encumbered, and/or conveyed. The restrictions set forth in Article III are reasonably necessary to protect present and future human health and safety or the environment as a result of the presence on the land of hazardous materials. Each and all of the Restrictions shall run with the land, and pass with each and every portion of the Burdened Property, and shall apply to, inure to the benefit of, and bind the respective successors in interest thereof, for the benefit of the Water Board and all Owners and Occupants. Each and all of the Restrictions are imposed upon the entire Burdened Property unless expressly stated as applicable to a specific portion of the Burdened Property. Each and.all of the Restrictions run with the land pursuant to section 1471 of the Civil Code. Each and all of the Restrictions are enforceable by the Water Board.

1.2 Concurrence of Owners, Occupants and Lessees Presumed. All Owners, Occupants, purchasers, lessees, or possessors of any portion of the Burdened Property shall be deemed by their purchase, leasing, or possession of such Burdened Property, to be in accord with the foregoing and to agree for and among themselves, their heirs, successors, and assignees, and the agents, employees, and lessees of such Owners, occupants, heirs, successors, and assignees, that the Restrictions as herein established must be adhered to for the benefit of the Water Board and the Owners and Occupants of the Burdened Property and that the interest of the Owners and Occupants of the Burdened Property shall be subject to the Restrictions contained herein.

1.3 Incorporation into Deeds and Leases. Covenantors desire and covenant that the Restrictions set out herein shall be incorporated in and attached to each and all deeds and

3 leases of any portion of the Burdened Property. Recordation of this Covenant shall be deemed binding on all successors, assigns, and lessees, regardless of whether a copy of this Covenant and Agreement has been attached to or incorporated into any given deed or lease.

1.4 Purpose. It is the pmpose of this instrument to convey to the Water Board real property rights, which will run with the land, to facilitate the remediation of past environmental contamination and to protect human health and the environment by reducing the risk of exposure to residual hazardous materials.

ARTICLE II DEFINITIONS

2.1 Water Board. "Water Board" shall mean the California Regional Water Quality Control Board for the San Francisco Bay Region-and shall include its successor agencies.

2.2 Improvements. "Improvements" shall mean all buildings, roads, driveways, regrading, and paved parking areas, constructed or placed upon any portion of the Burdened Property.

2.3 Occupants. "Occupants" shall mean Owners and those persons entitled by ownership, leasehold, or other legal relationship to the exclusive right to use and/or occupy all or any portion of the Burdened Property.

2.4 Owner or Owners. "Owner" or "Owners" shall mean Covenantors and their successors in interest who hold title to all or any portion of the Burdened Property (e.g., purchasers ofresidential buildings constructed on the Burdened Property) and includes future homeowners' associations ("HOAs"), and shall exclude the Occupants of the residential units in the buildings on the Burdened Property that do not hold title to all or any portion of the Burdened Property.

ARTICLE III DEVELOPMENT, USE AND CONVEYANCE OF THE BURDENED PROPERTY

3.1 Restrictions on Development and Use. Covenantors,rromise to restrict the use of the Burdened Property as follows:

a. No hospitals shall be permitted on the Burdened Property;

b. No schools for persons under 21 years of age shall be permitted on the Burdened Property;

c. No day care centers for children or day care centers for Senior Citizens shall be permitted on the Burdened Property;

.d. No Owners or Occupants of the Property or any portion thereof shall conduct any

4 excavation work on the Property, unless conducted in accordance with the Soil Management Plan ("SMP") approved by the Water Board (available on Geo Tracker on www.GeoTracker.com). Any contaminated soils brought to the surface by grading, excavation, trenching, or backfilling shall be managed by the Owner or its agent in accordance with SMP and all applicable provisions oflocal, state and federal law. Shallow excavations (less than two feet below the ground surface) related to such things as landscape shall be acceptable.

e. All uses and occupancy of the Burdened Property shall be consistent with any applicable Water Board Order or SMP, each of which includes the Vapor Mitigation System operation and maintenance ("VMS O&M") manual and the Vapor Mitigation Plan ("VMP"), which are both hereby incorporated by reference including foture amendments thereto. All uses and development shall preserve the integrity of any cap, any remedial measures taken or remedial equipment installed, and any groundwater monitoring system installed on the Burdened Property pursuant to the requirements of the Water Board, unless otherwise expressly permitted in writing by the Water Board. The VMS O&M manual and VMP govern all future soil vapor mitigation, monitoring, and reporting work at the Burdened Property. A copy of the VMS O&M manual and VMP is on file on www.GeoTracker.com.

f. No Owners or Occupants of the Property or any portion thereof shall drill, bore, otherwise construct, or use a well for the purpose of extracting water for any use, including but not limited to, domestic, potable, or industrial uses, unless expressly permitted in writing by the Water Board.

g. Owners and Occupants shall not disturb, pierce, modify or otherwise render ineffective any portion of the VMS or its operation.

h. The Owner or Occupant shall notify the Water Board of each of the following: (1) The type, cause, location and date of any disturbance of any remedial measures taken or remedial equipment installed (including the VMS), and any groundwater monitoring system installed on the Burdened Property pursuant to the requirements of the Water Board, which could affect the ability of-remedial measures, remedial equipment, or monitoring system to perform their respective functions and; (2) The type and date ofrepair of such disturbance. Notification to the Water Board shall be made by registered mail within ten (10) working days of both the discovery of such disturbance and the completion of repairs.

i. No Owner or Occupant of the Burdened Property shall act in any marmer that will aggravate or contribute to the existing environmental conditions of the Burdened Property. All use and development of the Burdened Property shall preserve the integrity of the VMS and any capped areas.

j. The Covenantors agree that the Water Board, and/or any persons acting pursuant to Water Board orders, shall have reasonable access to the Burdened Property for the purposes of inspection, surveillance, maintenance, or monitoring, as provided for in Division 7 of the Water Code.

5 k. The Covenantors agree to include the Notice required by paragraph 3.3, in all lease agreements with third parties for residences constructed on the Burdened Property the obligations contained in this paragraph 3.1.

I. The Owner (including Covenantors, future HOAs, or other successors in interest who hold title to all or any portion of the Burdened Property during their ownership of said properties), shall be responsible for monitoring and maintaining the VMS in accordance with the VMS O&M manual.

3.2 Enforcement. Failure of an Owner or Occupant to comply with any of the restrictions, as set forth in paragraph 3.1, shall be grounds for the Water Board, by reason of this Covenant, to have the authority to require that the Owner or Occupant modify or remove any Improvements constructed in violation of that paragraph. Violation of the Covenant shall be grounds for the Water Board to file civil actions against the Owner as provided by law.

3.3 Notice in Agreements. After the date ofrecordation hereof, all Owners and Occupants shall execute a written instrument, which shall accompany all purchase agreements or leases relating to the Burdened Property. Any such instrument shall contain the following statement:

:Toe land described herein contains hazardous materials in soils, soil vapor and in the ground water under the property, and is subject to a deed restriction dated as of J=el\. ,1-:> Tlj , 2011?, and recorded on Ff:8. 'l.o'/4 , 201.?, in the Official Records of Santa Clara County, California, as Document No. 'L) 8t: 1~5 , which Covenant and Restriction imposes certain covenants, conditions, and restrictions on usage of the property described herein. This statement is not a declaration that a hazard exists.

Any such instrument shall also include a fact sheet approved by the Water Board that describes the restrictions set forth in this Covenant and that provides instructions on how to access additional information regarding the Burdened Property and this Covenant on the Water Board's Geo Tracker online database.

ARTICLE IV VARIANCE AND TERMINATION .4.1 Variance. Any Owner or, with the Owner's consent, any Occupant of the Burdened Property or any portion thereof may apply to the Water Board for a written variance from the provisions of this Covenant. 4.2 Termination. Any Owner or, with the Owner's consent, any Occupant of the Burdened Property or a portion thereof may apply to the Water Board for a termination of the Restrictions as they apply to all or any portion of the Burdened Property . .4.3 Term. Unless terminated in accordance with paragraph 4.2 above, by law or otherwise, this Covenant shall continue in effect in perpetuity. 4.4 Prior Covenant. This Covenant shall supersede the existing Covenant and Agreement to Restrict Use of Property between AMD and the Water Board, dated August 7,

6 1992, in the Official Records of Santa Clara County, California, as Document No. 11407520 ("Prior Coveµant"). The Prior Covenant shall be deemed terminated effective as of the date of recordation of this Covenant in the Official Record.

ARTICLEV MISCELLANEOUS .5.1 No Dedication Intended. Nothing set forth herein shall be construed to be a gift or dedication, or offer of a gift or dedication, of the Burdened Property or any portion thereof to the general public . .5.2 Notices. Whenever any person gives or serves any notice, demand, or other communication with respect to this Covenant, each such notice, demand, or other communication shall be in writing and shall be deemed effective (I) when delivered, if personally delivered to the person being served or official of a government agency being served, or (2) three (3) business days after deposit in the mail if mailed by United States mail, postage paid certified, return receipt requested:

.lfTo: "Covenantors"

LS-Sunnyvale, LLC The Vale PA-1 Owner, LLC The Vale PA-2 Owner, LLC c/o Landsea Holdings Company 7525 Irvine Center Drive, Suite 200 Irvine, CA 92618

And

Arroyo Cap IV, LLC c/o Arroyo Capital, LLC 100 West Broadway, Suite 680 Long Beach, CA 90802

.lfTo: "Water Board"

Executive Officer California Regional Water Quality Control Board San Francisco Bay Region 1515 Clay Street, Suite 1400 Oakland, CA 94612 GeoTracker# Tl 0000003195; SL720051206; Tl 000001053 7

5.3 Partial Invalidity. If any portion of the Restrictions or terms set forth herein is determined to be invalid for any reason, the remaining portion shall remain in full force and effect as if such portion had not been included herein.

7 5 .4 Article Headings. Headings at the beginning of each numbered article of this Covenant are solely for the convenience of the parties and are not a pa1t of the Covenant.

5.5 Recordation. This instrument shall be executed by the Covenantors and by the Executive Officer of the Water Board. This instrument shall be recorded by the Covenantors in the County of Santa Clara within ten (10) days of the date of execution.

5 .6 References. All references to Code sections include successor provisions.

5, 7 Construction. Any general rule of construction to the contrary notwithstanding, this instrument shall be liberally construed in favor of the Covenant to effect the purpose of this instrument and the policy and purpose of the Water Code. If any provision of this instrument is found to be ambiguous, an interpretation consistent with the purpose of this instrument that would render the provision valid shall be favored over any interpretation that would render it invalid,

[SIGNATURES ON FOLLOWING PAGE]

8 IN WITNESS WHEREOF, the parties execute this Covenant as of the date set forth above.

Covenantors:

C, a California limited liability company

Peter Beucke Title: V t. ve... Qre.6 ; ~~'"' lr-

Date: \- 2.':)- \ 'b

e , L C, a California limited liability company

Peter Beucke Title: \H\..e- V'f'tb i ~e_,n,\--'

Date: \ - 'L ~ - \ i

Arroyo Cap IV, LLC, a Delaware limited liability company SIGNED IN COUNTERPART By:------Title: ______

Date: ------cis. o Bay Regional Water Quality Control Board

Bruce H. Wolfe .Title: Executive Officer

Date: _ r;,-=.._,e.b.:::...... c.:.__I t:>_- __,____~_ _1 -=:.._g ___ _

9 IN WITNESS WHEREOF, 1he parties execute this Covenant as of the date set forth above.

Covenantors:

LS-Sunnyvale, LLC, a California limited liability company

By: __SI_G_N_ED_IN_C_O_U_N_T_ER_P_'A_RT __ _

Title: ______

Date: ------~--- The Vale PA-I Owner, LLC, a California limited liability company

By: --=-S=IG=-N=f=D_,,J,._._N_,,,C""'Q-""tJNLILT_._.E...,RuuPAcuf'.?..._.t_· ___

Title: ------Date: ______

The Vale PA-2 Owner, LLC, a California limited liability company

By:------Title: SIGNED IN COUNTERPART

Date: ______

Arroyo Cap IV, LLC, a Delaware limited liability company

By: Q__.P1z /-1 4-6=-t<,,b;

Titl/4 f f"ll l: '7 /? /3/7.o t,, £ 1.. /Sr-;[15. Mana&er Date: / / 2 '7 /; 'b

Agency: State of California, San Francisco Bay Regional Water Quality Control Board SIGNED IN COUNTERPART By:------

Title:~.-~~------Date: ______

9 ACKNOWLEDGMENT

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document.

State of California County of Q(ClC'l°t-' On \ ~ JC( -d O , }?; (insert date), before .me, .M\J~~ ~.ta.l\t~ ({insert name and title ofthe officer), personally appeared---"u~eJ,2~=-'-:L<"l~i----_J(l.,...J_C.'c~-\.;ll..ll!OL--,)UJ~=:;,;\i..Il,e~:"-----­ [Covenantor], who proved to me on the basis of satisfactory evidence to be the ~son(s) whose name(s:@/are-subscribed to the within instrument and acknowledged t~e th~/shelthe:ji-­ executed the same i~aer+lheir authorized capacity(ies), and that by@/herlihei.1:'"'signature(s) on the instrument the person(s), or the entity upon behalf of which the person(s) acted, executed the instrument.

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct. HOLLY JEAN SHOOK w WITNESS my hand and official seal. COMM ... 2212017 o NOTARY PUBllC-CALIFORNIA C'i ORANGE COUNTY W Signature9i{Q, JlMA (Seal) My Tenn Exp, August 28, 2021

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document.

State of California County of Alameda o \ ,..yw.1:c. On 01,\ \$ \ 1 u (insert date), before me, .JOQ',.\/e.\jVI 1::\~c.'\rol'"«ef,!.lO\'°"::iinsert name and title ofthe officer), personally appeared ~-ruc.c:.. \-\. Wo\'e:.t. [Executive Officer], who proved to me on the basis of satisfactory evidence to be the person(~ whose name(~ is/~ subscribed to the within instrument and acknowledged to me that he/~~ executed the same in his/hl!r/thei:r authorized capacity(i:8$), and that by his~/theit signature(,sil on the instrument the person(\19, or the entity upon behalf of which the person(i,) acted, executed the instrument.

I certify under PENALTY OF PERJURY nnder the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature~~ ---::::> (Seal) ' . Q... 10 ACKNOWLEDGMENT

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document. State of California County of Contra Costa

On 1/23/2018 before me, Jacquelyn Elyse Trammer, Notary Public (insert name and title of the officer) personally appeared _P_e_t_e_r_B_e_u_c_k_e ______~------~ who proved to me on the basis of satisfactory evidence to be the persontll'.) whose name~ is/Me subscribed to the within instrument and acknowledged to me that he/~e/t~y executed the same in his/lcje.r/1;1-l!lir authorized capacity~s), and that by his~r/t~r signature(~ on the instrument the person(%), or the entity upon behalf of which the person(~ acted, executed the instrument.

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature a~ (Seal) ACKNOWLEDGMENT

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document. State of California County of Contra Costa on 1/23/2018 before me, Jacquelyn Elyse Trammer, Notary Public ------(insert name and title of the officer) personally appeared __Pe_t_e_r_B_e_u_c_k_e ______~ who proved to me on the basis of satisfactory evidence to be the person~) whose name(,!I) is/~ subscribed to the within instrument and acknowledged to me that he/Sk:(e/ttie:y executed the same in his/ne{/tf:rfir authorized capacity(lJn;), and that by his/hwtf1eftr signature(¾! on the instrument the person(,!i), or the entity upon behalf of which the person(-99_ acted, executed the instrument.

I certify under PENAL TY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal. it1·a;.;.,;;;.;;;n,;;,.,;::;;1 . ,, . . COMM. #2175819 ;;! i! · . ' ' NOTARY PUBLIC • CALIFORNfA J CONTRACOSIACOUNIY

••• , •• ••] ll 4 4 0 c~. EX:·zr:e,c;~e:~ 11a,z2g201 Signature_ ~N ~.::::> (Seal) ACKNOWLEDGMENT

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document. State of California County of Contra Costa

On 1/23/2018 before me, Jacquelyn Elyse Trommer, Notary Public (insert name and title of the officer) personally appeared _P_e_t_e_r_B_e_u_c_k_e ______who proved to me on the basis of satisfactory evidence to be the personOOwhose name~) is/~ subscribed to the within instrument and acknowledged to me that he/~/t~y executed the same in his/~/t~r authorized capacity(~, and that by his/hm/tljefr signature(,s) on the instrument the person(;t'), or the entity upon behalf of which the personti(i acted, executed the instrument.

I certify under PENAL TY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature a ~ (Seal) EXHIBIT A

LEGAL DESCRIPTION OF THE BURDENED PROPERTY

II Exhibit "A"

Legal Description

State of California, described as follows: Real property In the City of Sunnyvale, County of Santa Clara,

PARCEL ONE: "TRACT NO. 10358 THE VALE", LOTS 4, 5, 6, AND 7, AS SHOWN ON THAT CERTAIN MAP ENTITLED RECORDER OF THE COUNTY OF SANTA WHICH MAP WAS FILED FOR RECORD IN THE OFFICE OF THE 897 OF MAPS, AT PAGE(S) 41 CLARA, STATE OF CALIFORNIA, ON OCTOBER 17, 2016 IN BOOK . THROUGH 50, LOT 7, CONVEYED TO ARROYO CAP EXCEPTING THEREFROM THE PORTION THEREOF, LYING WITHIN SEPTEMBER 29, 2017, INSTRUMENT IV, LLC, A DELAWARE LIMITED LIABILITY COMPANY, RECORDED NO. 2376555"1, OFFICIAL RECORDS Wffil!N LOTS 5 AND 6, CONVEYED TO ALSO EXCEPTING THEREFROM THE PORTION THEREOF LYING RECORDED JANUARY 12, 2018, ARROYO CAP IV, LLC, A DELAWARE LIMITED LIABILJTY COMPANY, INSTRUMENT NO. 23848097, OFFICIAL RECORDS

PARCEL TWO: OVER LOTS B, C, D, E, AND F, AS A NON-EXCLUSIVE EASEMENT FOR INGRESS, EGRESS, AND UTILITIES THE VALE", WHICH MAP WAS FILED FOR SHOWN ON THAT CERTAIN MAP ENTITLED "TRACT NO. 10358 OF SANTA CLARA, STATE OF RECORD IN THE OFFICE OF THE RECORDER OF THE COUNTY AT PAGE(S) 41 THROUGH 50. CALIFORNIA, ON OCTOBER 17, 2016 IN BODI( 897 OF MAPS,

A.P.N.; Po1tionsof206-21-014, 206-21-015, 206-21-016, 026-21-017

PARCEL THREE: CERTAIN PARCEL MAP FILED FOR PARCEL A AND LOTS B, C, D, E, AND F, AS SHOWN UPON THAT OF SANTA CLARA, STATE OF CALIFORNIA, RECORD IN THE OFFICE OF THE RECORDER OF THE COUNTY ON NOVEMBER 30, 1973, IN BOOK 333 OF MAPS ON PAGE 30.

A.P.N.: NOT ASSESSED

PARCEL FOUR: NO. 2421 INTERNATIONAL SCIENCE LOT 18, AS SHOWN ON THAT CERTAIN MAP ENTITLED ''fRACT OF THE RECORDER OF THE COUNTY OF CENTER", WHICH MAP WAS FILED FOR RECORD IN THE OFFICE OF MAPS, AT PAGES 53, 54, 55 CLARA, STATE OF CALJFORNIA, ON JULY 15, 1959 IN BOOK 108 SANTA . AND 56. GEOTHERMAL RESOURCES AS EXCEPTING THEREFROM, ALL OIL, GAS AND OTHER HYDROCARBONS, CODE AND ALL OTHER DEFINED IN SECTION 6903 OF THE CALIFORNIA PUBLIC RESOURCES OR NOT, WITHIN OR THAT MAY BE MINERALS, WHETHER SIMILAR TO THOSE HEREIN SPECIFIED U.S.A., INC., A CORPORATION IN PRODUCED FROM SAID REAL PROPERTY, AS RESERVED BY CHEVRON IN BOOK E009 PAGE 544, OFFICIAL THE CORPORATION GRANT DEED RECORDED OCTOBER 6, 1978 RECORDS. TIME TO TIME TO DRILL AND AND FURTHER EXCEPTING, THE SOLE EXCLUSIVE RIGHT FROM REAL PROPERTY AND THE ADJOINING MAINTAIN WELLS OR OTHER WORKS INTO OR THROUGH SAID HUNDRED (500) FEET AND TO PRODUCE, STREETS, ROADS AND HIGHWAYS BELOW A DEPTH OF FIVE WORKS, OIL, GAS, WATER AND INJECT, STORE AND REMOVE FROM AND THROUGH SUCH WELLS OR TO PERFORM BELOW SAID OTHER SUBSTANCES OF WHATEVER NATURE, INCLUDING THE RIGHT FOR THE EXERCISE OF SUCH DEPTH ANY AND ALL OPERATION DEEMED NECESSARY OR CONVENIENT IN THE ABOVE REFERRED TO RIGHTS, AS RESERVED BY CHEVRON U.S.A., INC., A CORPORATION E009 PAGE 544, OFFICIAL CORPORATION GRANT DEED RECORDED OCTOBER 6, 1978 IN BOOK INC., A CORPORATION IN THE RECORDS. THE RIGHTS HEREINABOVE RESERVED BY CHEVRON U.S.A., OR RESERVE TO CHEVRON ABOVE REFERRED TO DEED, DO NOT INCLUDE AND DO NOT EXCEPT SAID REAL PROPERTY OR FIRST U.S.A., INC., A CORPORATION ANY RIGHT TO USE THE SURFACE OF ANY OPERATIONS THEREON OR FIVE HUNDRED (500) FEET BELOW SAID SURFACE OR TO CONDUCT PROPERTY. THEREIN, ALL RIGHTS AND INTERESTS IN THE SURFACE OF SAID REAL

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-...:l!. -...:l!. - EXHIBITB

TRACT MAP OF THE VALE PROPERTY

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L_ EXHIBITC

OWNERSHIP OF THE VALE PROPERTY

13 11!!1111 Lots A, B, C, D, Ean d F Taylor Morrison ot"Ca-lifomia, LLC: Lots I. 2 -and 3 The Vale Ownership Exhibit ,The~ el' A- 1-0wner.aLLt? Lot4 The Vale PA-I Owrer. LLC and Arroyo Cap 1V, LLC: Lot7 The Vale PA-2 Owner, LLC and Arroyo Cap IV. LLC: Lots 5 and 6·

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UNE TASLE WO.Mte 'IIOlfll.DfGTM ~I ~r.:' 'I' UK° i.: .... ~ ...... c­ u ~ JJ.OII.' V -.,O-e" I~ ),00' U CN'Tr,'" • •1.0II.' 1 t___J l_. l •-- • \ ___~ t_ ~~.-::.- 7 - ·u- . I ! ,,; . -:; .. ,.,, ~4q TRACT NO. 10358 > TllE VAl.E u t~- II I 7 LOfl FOR a·~ ,u,.,08£ $ "W AND I COIIIIION AU& LOTa ,c • C, ,JJ'~ ~"" ~ v,,- -i•!T I '..;R .d>'-~c,O',_i:>\l- ~4-c,'r y~... ~i_, ,tisi! ,~'I ·-C-:"~7 . :::t.~''Z~me .. JO ~Bkf ao' N,e,. :O,:S,I& 9tCE.T 2 or 10

--,-;i. 11'/ -,n AO l/2- EXHIBITD

LOCATION OF IMPAIRED SOIL ON THE VALE PROPERTY

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THE VALE ~BkF!QQ+ LOCATION OF ORGANOCHLORINE PESTICIDES ENGINEERS. SURVEYORS. PLANNERS DrawingNumber 1730 N. First STREET, SUl1E 600 ( 406}-467-9100 Drown KH Checked Jt.t Approved Jt.t SAN JOSE.CA 95112 www.blcf.com Job No. 20126114 Date 05/09/17 Sheet 1 of 1 EX-1 23871704 Accomrroclcd10~ Regina Alcomendras Santa Clara County - Clerk-Recorder Recording Requested By: 02/ 20/2018 01:59 PM

Taylor Morrison of California, LLC Til les: 1 Pages: 19 Attn: Division President Fees : 1154 .00 Taxes : 0 4309 Hacienda Drive, Suite 450 Total : 154.00 Pleasanton, California 94588

When Recorded, Mail To: Executive Officer California Regional Water Quality Control Board San Francisco Bay Region 1515 Clay Street, Suite 1400 Oakland, California 94612 GeoTracker# T10000003195; SL720051206; Tl0000010537

.COVENANT AND ENVIRONMENTAL RESTRICTION ON PROPERTY

THE VALE 915 DeGuigne, Sunnyvale, CA 94085

This Covenant and Environmental Restriction on Property (this "Covenant") is made as of the Jo th day of Fro, , 20J! by Taylor Morrison of California, LLC, a California limited liability company, ("Covenantor"), who is the Owner of record of that certain prpperty totaling approximately five and half acres comprised of Assessor Parcel Numbers 205~21-11 through 13 (the "Burdened Property") for the benefit of the California Regional Water Quality Control Board for the San Francisco Bay Region (the "Water Board"), with reference to the following facts:

A. The Ownership of the Burdened Property. The Burdened Property consists of three lots, Lots 1-3,, (described in Exhibit A) on a larger property that was formerly situated at 915 DeGuigne and is now commonly referred to as The Vale in the City of Sunnyvale, County of Santa Clara, State of California, which is more particularly described in Exhibit B attached hereto and incorporated herein by this reference ( such property hereinafter referred to as the "Vale Property"). As set forth on Exhibit C, the Vale Property is presently owned as follows:

LS-Sunnyvale, LLC: Lots A, B, C, D, E and F Taylor Morrison of California, LLC: Lots 1, 2 and 3 The Vale PA-1 Owner, LLC Lot4 The Vale PA-I Owner, LLC and Arroyo Cap IV, LLC: Lot 7 The Vale PA-2 Owner, LLC and Arroyo Cap IV; LLC: Lots 5 and 6 B. Contamination of the Burdened Property. The Burdened Property and groundwater underlying the Vale Property contain hazardous materials. The Vale Property, including the Burdened Property, was previously owned by Advanced Micro Devices ("AMO"), who constructed industrial buildings on the Site in 1974. Prior to that development, the site was primarily used for agricultural purposes. AMO and related entities utilized the site as a semiconductor fabrication and research development facility from 1974 until approximately 2015.

The soil, soil Vf!por and groundwater at the Vale Property were contaminated by releases from an underground storage tank containing trichloroethylene ("TCE") formerly located in the northwest portion of the Vale Property. TCE and cis-1,2- dichloroethylene ("cis-1,2- DCE") affected groundwater has migrated from releases at offsite properties to the Vale Property. Other volatile organic compounds ("VOCs") detected in soil and groundwater have also been addressed or continue to be addressed by the remedial actions being implemented at the Vale Property, including at the Burdened Property.

Active remediation has been conducted at the Vale Property since 1982 and in accordance with a cleanup and abatement order from the Water Board since 1991. As part of its remediation efforts, and with the oversight of the Water Board, AMO owns, operates, and maintains a groundwater extraction and treatment system located in the northwestern corner of the Vale Property to remove VOCs from the groundwater. Remedial efforts also included the excavation ofVOC impacted soil in the central portion of the Site. Additionally, vapor mitigation systems (VMS) have been and/or shall be installed at the Vale Property, including the Burdened Property that will require operation and maintenance in order to remain effective.

Organochlorine pesticides detected in shallow soil from historical agricultural practices were excavated and encapsulated beneath the building pads of residential buildings within the Burdened Property. This area of the Vale Property, including the Burdened Property, is to remain undisturbed. A map identifying the location of the encapsulated soil is contained on ExhibitD.

More information regarding the Burdened Property, and the surrounding area, can currently be reviewed at the State Water Resources Control Board Geo Tracker website at: https://geotracker. waterboards.ca.gov /profile _report.asp?global _id=Tl 0000003195

C. Exposure Pathways. The contaminants addressed in this Covenant are present in soil, soil vapor, and groundwater on the Burdened Property. Without the mitigation measures which have been performed on the Burdened Property, exposure to these contaminants could take place via inhalation, of chemically-affected soil vapor or ingestion of chemically­ affected groundwater. The risk of public exposure to the contaminants has been substantially lessened by the remediation and controls described herein.

D. Adjacent Land Uses and Population Potentially Affected. The Burdened Property is used for residential purposes and is adjacent to residential, educational, and commercial land uses.

2 E. Full and voluntary disclosure to the Water Board of the presence of hazardous materials on the Burdened Property has been made and extensive sampling of the Burdened Property has been conducted.

F. Covenantor desires and intends that in order to benefit the Water Board, and to protect the present and future public health and safety, the Burdened Property shall be used in such a manner as to avoid potential harm to persons or prope1ty that may result from hazardous materials that may have been deposited on portions of the Burdened Property.

ARTICLE I GENERAL PROVISIONS

1.1 Provisions to Run with the Land. This Covenant sets forth protective provisions, covenants, conditions and restrictions (collectively referred to as "Restrictions") upon and subject to which the Burdened Property and every portion thereof shall be improved, held, used, occupied, leased, sold, hypothecated, encumbered, and/or conveyed. The restrictions set forth in Article III are reasonably necessary to protect present and future human health and safety or the environment as a result of the presence on the land of hazardous materials. Each and all of the Restrictions shall run with the land, and pass with each and every portion of the Burdened Property, and shall apply to, inure to the benefit of, and bind the respective successors in interest thereof, for the benefit of the Water Board and all Owners and Occupants. Each and all of the Restrictions are imposed upon the entire Burdened Property unless expressly stated as applicable to a specific portion of the Burdened Property. Each and all of the Restrictions run with the land pursuant to section 1471 of the Civil Code. Each and all of the Restrictions are enforceable by the Water Board.

1.2 Concurrence of Owners, Occupants and Lessees Presumed. All Owners, Occupants, purchasers, lessees, or possessors of any portion of the Burdened Property shall be deemed by their purchase, leasing, or possession of such Burdened Property, to be in accord with the foregoing and to agree for and among themselves, their heirs, successors, and assignees, and the agents, employees, and lessees of such Owners, occupants, heirs, successors, and assignees, that the Restrictions as herein established must be adhered to for the benefit of the Water Board and the Owners and Occupants of the Burdened Property and that the interest of the Owners and Occupants of the Burdened Property shall be subject to the Restrictions contained herein.

1.3 Incorporation into Deeds and Leases. Covenantor desires and covenants that the Restrictions set out herein shall be incorporated in and attached to each and all deeds and leases of any po1tion of the Burdened Property. Recordation of this Covenant shall be deemed binding on all successors, assigns, and lessees, regardless of whether a copy of this Covenant and Agreement has been attached to or incorporated into any given deed or lease.

1.4 Purpose. It is the purpose of this instrument to convey to the Water Board real property rights, which will run with the land, to facilitate the remediation of past environmental contamination and to protect human health and the environment by reducing the risk of exposure to residual hazardous materials.

3 ARTICLE II DEFINITIONS

2.1 Water Board. "Water Board" shall mean the California Regional Water Quality Control Board for the San Francisco Bay Region-and shall include its successor agencies.

2.2 Improvements. "Improvements" shall mean all buildings, roads, driveways, regrading, and paved parking areas, constructed or placed upon any portion of the Burdened Property.

2.3 Occupants. "Occupants" shall mean Owners and those persons entitled by ownership, leasehold, or other legal relationship to the exclusive right to use and/or occupy all or any portion of the Burdened Property.

2.4 Owner or Owners. "Owner" or "Owners" shall mean Covenantor and its successors in interest who hold title to all or any portion of the Burdened Property (e.g., purchasers of residential buildings constructed on th.e Burdened Property) and includes future homeowners' associations ("HO As"), and shall exclude the Occupants of the residential units in the buildings on the Burdened Property that do not hold title to all or any portion of the Burdened Property.

ARTICLE III DEVELOPMENT, USE AND CONVEYANCE OF THE BURDENED PROPERTY

3 .1 Restrictions on Qevelopment and Use. Covenantor"promises to restrict the use of the Burdened Property as follows:

a. No hospitals shall be permitted on the Burdened Property;

b. No schools for persons under 21 years of age shall be permitted on the Burdened Property;

c. No day care centers for children or day care centers for Senior Citizens shall be permitted on the Burdened Property;

d. No Owners or Occupants of the Property or any portion thereof shall conduct any excavation work on the Property, unless conducted in accordance with the Soil Management Plan ("SMP") approved by the Water Board (available on GeoTracker on www.GeoTracker.com). Any contaminated soils brought to the surface by grading, excavation, trenching, or backfilling shall be managed by the Owner or its agent in accordance with SMP and all applicable provisions of local, state and federal law. Shallow excavations (less than two feet below the ground surface) related to such things as landscape shall be acceptable.

e. All uses and occupancy of the Burdened Property shall be consistent with any

4 applicable Water Board Order or SMP, each of which includes the Vapor Mitigation System operation and maintenance ("VMS O&M") manual and the Vapor Mitigation Plan ("VMP"), which are both hereby incorporated by reference including future amendments thereto. All uses and development shall preserve the integrity of any cap, any remedial measures taken or remedial equipment installed, and any groundwater monitoring system installed on the Burdened Property pursuant to the requirements of the Water Board, unless otherwise expressly permitted in writing by the Water Board. The VMS O&M manual and VMP govern all future soil vapor mitigation, monitoring, and reporting work at the Burdened Property. A copy of the VMS O&M manual and VMP is on file on www.GeoTracker.com.

f. No Owners or Occupants of the Property or any portion thereof shall drill, bore, otherwise construct, or use a well for the purpose of extracting water for any use, including but not limited to, domestic, potable, or industrial uses, unless expressly permitted in writing by the Water Board.

g. Owners and Occupants shall not disturb, pierce, modify or otherwise render ineffective any portion of the VMS or its operation.

h. The Owner or Occupant shall notify the Water Board of each of the following: (1) The type, cause, location and date of any disturbance of any remedial measures taken or remedial equipment installed (including the VMS), and any groundwater monitoring system installed on the Burdened Property pursuant to the requirements of the Water Board, which could affect the ability of-remedial measures, remedial equipment, or monitoring system to perform their respective functions and; (2) The type and date of repair of such disturbance. Notification to the Water Board shall be made by registered mail within ten (10) working days of both the discovery of such disturbance and the completion of repairs.

i. No Owner or Occupant of the Burdened Property shall act in any manner that will aggravate or contribute to the existing environmental conditions of the Burdened Property. All use and development of the Burdened Property shall preserve the integrity of the VMS and any capped areas.

j. The Covenantor agrees that the Water Board, and/or any persons acting pursuant to Water Board orders, shall have reasonable access to the Burdened Property for the purposes of inspection, surveillance, maintenance, or monitoring, as provided for in Division 7 of the Water Code.

k. The Covenantor agrees to include the Notice required by paragraph 3.3, in all lease agreements with third parties for residences constructed on the Burdened Property the obligations contained in this paragraph 3.1.

I. The Owner (including Covenantor, future HOAs, or other successors in interest who hold title to all or any portion of the Burdened Property during their ownership of said properties), shall be responsible for monitoring and maintaining the VMS in accordance with the VMS O&M manual.

5 3.2 Enforcement. Failure of an Owner or Occupant to comply with any of the restrictions, as set forth in paragraph 3.1, shall be grounds for the Water Board, by reason of this Covenant, to have the authority to require that the Owner or Occupant modify or remove any Improvements constructed in violation of that paragraph. Violation of the Covenant shall be grounds for the Water Board to file civil actions against the Owner as provided by law.

3.3 Notice in Agreements. After the date ofrecordation hereof, all Owners and Occupants shall execute a written instrument, which shall accompany all purchase agreements or leases relating to the Burdened Property. Any such instrument shall contain the following statement:

The land described herein contains hazardous materials in soils, soil vapor and in the ground water under the property, and is subject to a deed restriction dated as of f7=.'"'B, ZoTI/ ,2018,andrecordedon f£B ~ ,2018,intheOfficial Records of Santa Clara County, California, as OocumentNo.1.}9'rl~ , which Covenant and Restriction imposes certain covenants, conditions, and restrictions on usage of the property described herein. This statement is not a declaration that a hazard exists.

Any such instrument shall also include a fact sheet approved by the Water Board that describes the restrictions set forth in this Covenant and that provides instructions on how to access additional information regarding the Burdened Property and this Covenant on the Water Board's Geo Tracker oniine database.

ARTICLE IV VARIANCE AND TERMINATION 4.1 Variance. Any Owner or, with the Owner's consent, any Occupant of the Burdened Property or any portion thereof may apply to the Water Board for a written variance from the provisions of this Covenant. 4.2 Termination. Any Owner or, with the Owner's consent, any Occupant of the Burdened Property or a portion thereof may apply to the Water Board for a termination of the Restrictions as they apply to all or any portion of the Burdened Property. 4.3 Ierm. Unless terminated in accordance with paragraph 4.2 above, by law or otherwise, this Covenant shall continue in effect in perpetuity. 4.4 Prior Covenant. This Covenant shall supersede the existing Covenant and Agreement to Restrict Use of Property between AMD and the Water Board, dated August 7, 1992, in the Official Records of Santa Clara County, California, as Document No. 11407520 ("Prior Covenant"). The Prior Covenant shall be deemed terminated effective as of the date of recordation of this Covenant in the Official Record.

ARTICLEV MISCELLANEOUS 5.1 No Dedication Intended. Nothing set forth herein shall be construed to be a gift or dedication, or offer of a gift or dedication, of the Burdened Property or any portion thereof to the general public.

6 .5.2 Notices. Whenever any person gives or serves any notice, demand, or other communication with respect to this Covenant, each such notice, demand, or other communication shall be in writing and shall be deemed effective (I) when delivered, if personally delivered to the person being served or official of a government agency being served, or (2) three (3) business days after deposit in the mail if mailed by United States mail, postage paid certified, return receipt requested:

JfTo: "Covenantor"

Taylor Morrison of California, LLC Attn: Division President 4309 Hacienda Drive, Suite 450 Pleasanton, California 94588

If To: "Water Board"

Executive Oflicer California Regional Water Quality Control Board San Francisco Bay Region 1515 Clay Street, Suite 1400 Oakland, CA 946 I 2 GeoTracker # T10000003195; SL720051206; TI0000010537

5.3 Partial Invalidity. If any portion of the Restlictions or terms set forth herein is determined to be invalid for any reason, the remaining portion shall remain in full force and effect as if such portion had not been included herein.

5.4 Article Headings. Headings at the beginning of each numbered article of this Covenant are solely for the convenience of the parties and are not a part of the Covenant.

5.5 Recordation. This instrument shall be executed by the Covenantor and by the Executive Officer of the Water Board. This instrument shall be recorded by the Covenantor in the County of Santa Clara within ten (10) days of the date of execution.

5.6 References. All references to Code sections include successor provisions.

5. 7 Construction. Any general rule of construction to the contrary notwithstanding, this instrument shall be liberally construed in favor of the Covenant to effect the purpose of this instrument and the policy and purpose of the Water Code. If any provision of this instrument is found to be ambiguous, an interpretation consistent with the purpose of this instrument that would render the provision valid shall be favored over any interpretation that would render it invalid. 1

[SIGNATURES ON FOLLOWING PAGE]

7 IN WITNESS WHEREOF, the parties execute this Covenant as of the date set forth above.

Covenanter:

Taylor Mo

Title: __j=e=V\~y\'---'---l\ ,..l-<-!-1----\)<~...!.....!-\-"--'.-V _ ____

Date: ____V____._\? ___ J_an_ u_a_r--'-y_3_1_,_20_1_8___ _

Agency: State,, ~ By:_---.1::>"'--='--=- -¥------<+--F--=------­ Bruce H. Wolfe Title: Executive Officer

Date: _,__,feJJ""-=-- -=-; __,__} _5_1 _?-/)~-'-~- ----

8 CALIFORNIA ALL- PURPOSE CERTIFICATE OF ACKNOWLEDGMENT

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document.

State of California }

County of _A_la_m_ed_a______}

On January 31, 2018

personally appeared _J_e_n_n_ife_r_B_es_m_e_r______who proved to me on the basis of satisfactory evidence to be the person(-s-) whose name(-s-)@ are subscribed to the within instrument and acknowledged to me that he/@they executed the same in his(Q§Ytheir authorized capacity(ies), and that by his~their signature(-s-) on the instrument the person(-s-), or the entity upon behalf of which the person(s-) acted, executed the instrument.

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct. CELfSH H JOHNSON Comm1ss1on # 2138624 ~ z WITNESS my hand and official seal. ~ Notary Public • California ~ z Alameda County - • • M~ De; 2}}~1 ;( J.a 0 ~ 0 so~m0 txtr:,s /Jd&t-Si!~ (Notary Public Seal) INSTRUCTIONS FOR COMPLETING THIS FORM ADDITIONAL OPTIONAL INFORMATION Thisfim11 complies with current California statutes regarding notwy wording and, DESCRIPTION OF THE ATTACHED DOCUMENT ifneeded, should be completed and attached to the documem. Acknowledgments ji-om other states may be completed for documents being sent to that state so long as the wording does 110/ require the California notmy to violate California nota,y law. (Title or description of attached document) • State and County infonnation must be the State and County where the document signer(s) personally appeared before the notary public for acknowledgment. • Date of notarization must be the date that the signer(s) personally appeared which (Tille or description of attached document continued) must also be the same date the acknowledgment is completed. • The notary public must print his or her name as it appears within his or her Number of Pages __ Document Date_____ commission followed by a comma and then your title (notary public). • Print the name(s) of document signer(s) who personally appear at the time of notarization. CAPACITY CLAIMED BY THE SIGNER • Indicate the correct singular or plural fonns by crossing off incorrect fonns (i.e. 1-ie/she/lRey;- is /aFe) or circling the correct forms. Failure to correctly indicate this □ Individual (s) information may lead to rejection of document recording. □ Corporate Officer • The notary seal impression must be clear and photographically reproducible. Impression must not cover text or lines. If seal impression smudges, re-seal if a (Title) sufficient area pennits, otherwise complete a different acknowledgment form. • Signature of the notary public must match the signature on file with the office of □ Partner(s) the county clerk. □ Attorney-in-Fact ❖ Additional infonnation is not required but could help to ensure this □ Trustee(s) acknowledgment is not misused or attached to a different document. ❖ Indicate title or type of attached document, number of pages and date. □ Other ______❖ Indicate the capacity claimed by the signer. If the claimed capacity is a corporate officer, indicate the title (i.e. CEO, CFO, Secretary). 2015 Version www.NotaryClasses.com 800-873-9865 • Securely attach this document to the signed document with a staple. ACKNOWLEDGMENT

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this ceitificate is attached, and not the truthfulness, accuracy, or validity of that document.

State of California County of ______

On ______(insert date), before me, ______(insert name and title ofthe officer), personally appeared-,,--,--,,-----c-c------­ [Covenantor], who proved to me on the basis of satisfactory evidence to be the person(s) whose name(s) is/are subscribed to the within instrument and acknowledged to me that he/she/they executed the same in his/her/their authorized capacity(ies), and that by his/her/their signature(s) on the instrument tl1e person(s), or the entity upon behalf of which tl1e person(s) acted, executed the instrument.

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature ______(Seal)

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document.

State of California County of Alameda

On Dt-\ \ S \ I q, (insert date), before me,JW.qve\:;1v, B::¥>C,--Y01"ll'>ifiN~('t:;;:;,t name and title ofthe qfficer), personally appeared 2,(\J(&.. V'I. \JJO\f'<.. [Executive Officer], who proved to me on the basis of satisfactory evidence to be the person~ whose name(~ is/~ subscribed to the within instrument and acknowledged to me that he/slom/tbey executed the same in his/lt@

I certify under PENALTY OF PERJURY under tbe laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature~ ~ > (Seal)

JO EXHIBIT A

LEGAL DESCRIPTION OF THE BURDENED PROPERTY

IO File Number: 0131- 622046ala

Exhiblt"A"

· Legal Description

Real property In the City of Sunnyvale, County of Santa Clara, State of California, described as follows:

PARCEL ONE:

LITTS 1, 2 AND 3, AS SHOWN ON THAT CERTAIN MAP ENTITLED "TRACT NO. 10358 THE VALE", WHICH MAP WAS ALEO FOR RECORD IN THE OFFICE OF THE RECORDER OF THE COUNTY OF SANTA CLARA, STATE OF CALIFORNIA, ON OCTOBER 17, 2016 IN BOOK 897 OF MAPS, AT PAGE(S) 41 THROUGH 50.

PARCEL TWO:

A NON-EXCLUSIVE EASEMENT FOR INGRESS, EGRESS, AND UTILITIES OVER LOTS B, C, D, E, AND F, AND THAT PORTION OF LOT A LOCATED BETWEEN LOT 2 AND LOT 3, AS SHOWN ON THAT CERTAIN MAP ENTITLED "TRACT NO, 10358 THE VALE", WHICH MAP WAS FILED FOR RECORD IN THE OFACE OF THE RECORDER OF THE COUNTY OF SANTA CLARA, STATE OF CALIFORNIA, ON OCTOBER 17, 2016 IN BOOK 897 OF MAPS, AT PAGE(S) 41 THROUGH 50.

A.P.N.: 205·21·011 (Lot 1), 205-21-012 (Lot 2), and 205-21-013 (Lot 3)

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- - EXHIBIT B

TRACT MAP OF THE VALE PROPERTY

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!111N!l,WOI.ISJillNY,; EXHIBITC

OWNERSHIP OF THE VALE l'ROPERTY

12 Lots A, B. C. D, E and F -Taylor Morrison 01 Cali 1om1a, LL Lots I, 2 and 3 The Vale Ownership Exhibit :ValePA~+Owner,t"'L~ lot 4 The Vale PA- I Qwner, LLG,and Arroyo Cap ', LLQ Lot 7 The Vale PA-2 Owner, LLC and Arroyo Cap V~LLC· Lots 5 and 6

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.-,,-:z.1,-1-,n~O 1/2 EXHIBITD

LOCATION OF IMPAIRED SOIL ON THE VALE PROPERTY

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-:,·. I '.· '. !. ~ -·1·rt r=[·--- r~.1 -~=~~-"'7 ;'1.. n "'· [ I : I '1 1 I i ' 1 . '?'=·=;.;;-, a! · i -~ I.i : t I i i, Ii ~ ' ( !ir r' .• . ..: --~"Tl _J ,l\1 ,li • (L'Jill.i ii • ; ; J !l , -··'-•------•.------~-,_, J_ ~~ : ..· - ·-· II ~ ,L.,._;i ~-~ ·- , - • • • ·- · I 1 i l'l ~-- :-~--!1 11 1 ;··11-- \ . - -· ..;,,r_.,,_ _.,.,, J -) I ,p== :-;;-,:.. . L _ • ..: i 0 M ~~· :~,. ; f ' : / ;/?:;.,.,;;~'""~ ,:: • ~,-'.. LU G ffiL--~,.J L:-..,~--'. ll_...:·--: ~ . \/✓--.. ~-'/\-'\-s-~•,..._--'·--~c.,.---:::ld ,i, .- - I ,; ' -',:/V" ,,.'· ==•"'' ',_j) •• ~~- -~- ~~~,,,,~,-~.31~~lr-- ~. o l' =:::::;:--~,,,, •• •, -~~ 1rr ,rl ,. \

I LOCAllON OF ORGANOCHLORINE PESllCIDES \ ' {/J' ':,,,_ f (! ---~..--,.J\,~ ~ ------j .{!'r-,1 ,._..--- ~ _"'I ~-~, ~~-r?'::'t +---.-,~7~ ,__ W//),1/J POlENTIAL LOCATION OF ORGANOCHLORINE 1 " Ii I i , ' !,i • • ' '' • , I! i 1 t'.::£~~~,,;::/,1/~-~ 1 ii r !,I "l.,-±.-;:ttL~ • : , 1 r i ,! ~ J I t ..r ) /,1 PESllCIDES r--- I;, - ·-· ~II i ' !ii" ; ,. 1,1> I I • nlf'" j, ' ~ 1tl;rrr=- - {~ 1 r ~@~: ; i: r 1 ~ij r ! \~--·--t-.-~~-----~--1 _ '-:::_~·:-:;_::~. ____i. .. ~~:-::·; _ L- lt_;

l//~'111:uittH!li,urrmmn,.i ,nllnHii•·ffiJTTT~.,-:1,,,1,i. 11: .Jli1H1 i , /- 111 /2/·. '! ;·1fl p !I W'I! p I! f(! Ul.f', f·4Jlillllilili.LU?lli.JJJ.ill.. ~ fr= t!t't'=;;!l,±h~~- ----~ §i · · .1 • r-- ,F ir

THE VALE ~BkFlQQ+ LOCATION OF ORGANOCHLORINE PESTICIDES ENGINEERS. SURVEYORS. PLANNERS Drawing Number 1730 N. First STREET.SUITE 600 (408)-467-9100 Drown KH Checked JM Approved JM SAN JOSE. CA 95112 www.bkf.com Job No. 20126114 Date 05/09/17 Sheet 1 of 1 EX-1 **This document was electronically submitted to Santa Clara County for recording** 24020105 RECORDING REOUESTFi. Regina Alcomendras AffST AMERICAN TIT~-:~ Santa Clara County - Clerk-Recorder 09/10/2018 12:11 PM 0131- 0dicJi-'-/09 c./q Titles: 1 Pages: 11 Re,;ording Requested By: Fees: $130.00 LS-Sunnyvale , LLC Tax: $0 The Vale PA-1 Owner, LLC Total: $130.00 The Vale PA-2 Owner, LLC c/o Landsea Holdings Company 7525 Irvine Center Drive, Suite 200 Irvine, CA 92618

And Arroyo Cap IV, LLC c/o Arroyo Capital, LLC 100 West Broadway, Suite 680 Long Beach, CA 90802

When Recorded, Mail To: Executive Officer California Regional Water Quality Control Board San Francisco Bay Region 1515 Clay Street, Suite 1400 Oakland, California 94612

AMENDMENTTOTHECOVENANTAND ENVIRONMENTAL RESTRICTION ON PROPERTY

THE VALE 915 DeGuigne Drive, Sunnyvale, CA

THIS AMENDMENT TO THE COVENANT AND ENVIRONMENTAL RESTRICTION ON PROPERTY (this "Amendment"), is made as of the / ()#1 day of St.pfember, 2018 by LS-Sunnyvale, LLC, a California limited liability company, The Vale PA­ I Owner, LLC, a California limited liability company, The Vale PA-2 Owner, LLC, a California limited liability company, and Arroyo Cap IV, LLC, a Delaware limited liability company (collectively, "Covenantors"), who are the Owners of the Burdened Property, for the benefit of the California Regional Water Quality Control Board for the San Francisco Bay Region (the "Water Board").

Covenantors and the Water Board ·desire to amend that certain Covenant and Environmental Restriction on Property (the "Covenant"), dated as of and recorded on February 20, 2018 as Document No. 23871705 in the Official Records of Santa Clara County, State of California, as follows:

1. Exhibit A of the Covenant is hereby deleted and replaced with Exhibit A attached to this Amendment in order to (a) exclude the Park Lot (defmed below) from the legal description

1036910v2 1 DOC #24020105 Page 2 of 11

for the Burdened Property, and (b) correct certain errors in the original legal description of the Burdened Property attached to the Covenant;

2. The Covenant is hereby terminated as to that certain parcel of land located at the comer of East Duane Avenue and DeGuine Drive that will be used as a park (the "Park Lot"), which is legally described on Exhibit E attached to this Amendment;

3. Exhibit B of the Covenant is hereby deleted and replaced with Exhibit B attached to this Amendment in order to clarify that the Park Lot is not included as part of the Vale Property.

All capitalized terms used in this Amendment which are not specifically defined herein shall have the meanings ascribed to such terms in the Covenant.

[SIGNATURES ON FOLLOWING PAGE]

!036910v2 2 DOC #24020105 Page 3 of 11

IN WITNESS WHEREOF, the undersigned Covenan.tors have caused this Amendment to be executed as of the date affixed below.

COVENANTORS:

bility compan.y

By:_--1-~l=!--l~wq:111------­ Title:* O,v', ';>,'(Y) QY--e,6 i he.n-r *Peter Beucke

er, LLC, iability compan.y

By:_.\--llo.:=..:..~,¥.., .J--=----- Title: * o:v ~ ~; Ot'\ Qrtb; cev\ ~ *Peter Beucke Date: 'i, ~ J...'o · I 'b

HA/TllPr, LLC, bility compan.y

By:_.IJ-lJ~--W~..!:,______Title: * :D~ \I~~, O\"\ fn:5~ ~e-l\~ *Peter Beucke Date: ':6 - 2./b - \ ~

Arroyo Cap IV, LLC, a Delaware limited liability compan.y

By: ~ /4 Lu.tr ✓ Titl~f<:.. vi° * Jeffrey B. Brouelette Date: __~_,_/_2._'f-'---+-/...._1 ...... Z __ _

1036910v2 3 DOC #24020105 Page 4 of 11

IN WITNESS WHEREOF, the Water Board hereby approves this Amendment pursuant to Article IV, section 4.1 of the Covenant, as of the date affixed below.

Agency:

:*Executive Officer *Bruce H. Wolfe Date: ~,Pr: W ;?~{}/ f? 1

1036910v2 4 DOC #24020105 Page 5 of 11

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document.

State of California ) County of Contra Costa )

On v ~ 'l'b /2.oJ before me, ,~c..qve)jv:l ~~1'

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature DOC #24020105 Page 6 of 11

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document.

State of California ) County of Los ,A..agctes O.,t~ N ~ )

--'----...-'i--:----==---i----'---"a...,,,<_'-'-~-' before me, :tt;:: \t::.- (2 j-\-U ~ ~ G+t U JJ G;:, a Notary Public, personall appeared :::refftt'::1 ~, BP,.O\,\tlb rt E , who proved to me on the basis of satisfactory evidence to be the person(.i-} whose name(s)' is/are-subscribed to the within instrument and acknowledged to me that he/she/they executed the same in his/hertlhetr authorized capacity(ies), and that by hisaiootheir signature(s) on the instrument the perso$), or the entity upon behalf of which the personts) acted, executed the instrument.

I certify under PENAL TY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature DOC #24020105 Page 7 of 11

A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document.

State of California ) County of Alameda )

On Se..~'Oif(e ,Zol0o , before me, .JO..C.£\vCl:Y) E½~ Ty:ctl'\Me/ , a Notary Public, personally appeared {'.,rv<.cll.w°' 'tC... , who proved to me on the basis of satisfactory evidence to be the person()!Q_ whose name!X) is/aire subscribed to the within instrument and acknowledged to me that he/SRC/t~ executed the same in his~t~ authorized capacity(l\(s), and that by his~/&eir signature(*on the instrument the person(JQ, or the entity upon behalf of which the person(~ acted, executed the instrument.

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature DOC #24020105 Page 8 of 11

Exhibit A Legal Description of the Burdened Property

Real property in the City of Sunnyvale, County of Santa Clara, State of California, described as. follows:

PARCEL ONE:

LOTS 4, 5, 6, AND 7, AS SHOWN ON THAT CERTAIN MAP ENTITLED "TRACT NO. 10358 THE VALE", WHICH MAP WAS FILED FOR RECORD IN THE OFFICE OF THE RECORDER OF THE COUNTY OF SANTA CLARA, STATE OF CALIFORNIA, ON OCTOBER 17, 2016 IN BOOK 897 OF MAPS, AT PAGE(S) 41 THROUGH 50.

PARCEL TWO:

A NON-EXCLUSIVE EASEMENT FOR INGRESS, EGRESS, AND UTILITIES OVER LOTS B, C, D, E, AND F, AS SHOWN ON THAT CERTAIN MAP ENTITLED "TRACT NO. 10358 THE VALE", WHICH MAP WAS FILED FOR RECORD IN THE OFFICE OF THE RECORDER OF THE COUNTY OF SANTA CLARA, STATE OF CALIFORNIA, ON OCTOBER 17, 2016 IN BOOK 897 OF MAPS, AT PAGE(S) 41 THROUGH 50.

A.P.N.: Portions of206-21-014, 206-21-015, 205-21-016, 026-21-017

PARCEL THREE:

PARCEL A AND LOTS 8, C, D, E, AND F, AS SHOWN UPON THAT CERTAIN PARCEL MAP FILED FOR RECORD IN THE OFFICE OF THE RECORDER OF THE COUNTY OF SANTA CLARA, STATE OF CALIFORNIA, ON NOVEMBER 30, 1973, IN BOOK 333 OF MAPS ON PAGE 30.

A.P.N.: NOT ASSESSED

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Exhibit B Tract Map of the Vale Property

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Exhibit E Legal Description of Park Lot

PARCEL FOUR:

LOT 18, AS SHOWN ON THAT CERTAIN MAP ENTITLED "TRACT NO. 2421 INTERNATIONAL SCIENCE CENTER", WHICH MAP WAS FILED FOR RECORD IN THE OFFICE OF THE RECORDER OF THE COUNTY OF SANTA CLARA, STATE OF CALIFORNIA, ON JULY 15, 1959 IN BOOK 108 OF MAPS, AT PAGES 53, 54, 55 AND 56.

EXCEPTING THEREFROM, ALL OIL, GAS AND OTHER HYDROCARBONS, GEOTHERMAL RESOURCES AS DEFINED IN SECTION 6903 OF THE CALIFORNIA PUBLIC RESOURCES CODE AND ALL OTHER MINERALS, WHETHER SIMILAR TO THOSE HEREIN SPECIFIED OR NOT, WITHIN OR THAT MAY BE PRODUCED FROM SAID REAL PROPERTY, AS RESERVED BY CHEVRON U.S.A., INC., A CORPORATION IN THE CORPORATION GRANT DEED RECORDED OCTOBER 6, 1978 IN BOOK E009 PAGE 544, OFFICIAL RECORDS.

AND FURTHER EXCEPTING, THE SOLE EXCLUSIVE RIGHT FROM TIME TO TIME TO DRILL AND MAINTAIN WELLS OR OTHER WORKS INTO OR THROUGH SAID REAL PROPERTY AND THE ADJOINING STREETS, ROADS AND HIGHWAYS BELOW A DEPTH OF FIVE HUNDRED (500) FEET AND TO PRODUCE, INJECT, STORE AND REMOVE FROM AND THROUGH SUCH WELLS OR WORKS, OIL, GAS, WATER AND OTHER SUBSTANCES OF WHATEVER NATURE, INCLUDING THE RIGHT TO PERFORM BELOW SAID DEPTH ANY AND ALL OPERATION DEEMED NECESSARY OR CONVENIENT FOR THE EXER□ SE OF SUCH RIGHTS, AS RESERVED BY CHEVRON U.S.A., INC., A CORPORATION IN THE ABOVE REFERRED TO CORPORATION GRANT DEED RECORDED OCTOBER 6, 1978 IN BOOK E009 PAGE 544, OFFI □AL RECORDS. THE RIGHTS HEREINABOVE RESERVED BY CHEVRON U.S.A., INC., A CORPORATION IN THE ABOVE REFERRED TO DEED, DO NOT INCLUDE AND DO NOT EXCEPT OR RESERVE TO CHEVRON U.S.A., INC., A CORPORATION ANY RIGHT TO USE THE SURFACE OF SAID REAL PROPERTY OR FIRST FIVE HUNDRED (500) FEET BELOW SAID SURFACE OR TO CONDUCT ANY OPERATIONS THEREON OR THEREIN, ALL RIGHTS AND INTERESTS IN THE SURFACE OF SAID REAL PROPERTY.

A.P.N.: 205-21--002

Exhibit E