SITE DESIGNATION - STATUS REPORT For information on completing and submitting this status report, refer to the instructions on reverse.

Date: 08/09/18 Lead Agency:

Department of Toxic Substances Control Office of Geology Site Name/Address: Project Manager Name:

PG&E Topock Compressor Station Aaron Yue Needles, CA Resolution Number: 03/03 Project Manager Phone Number:

(714) 484-5439

1. Date(s) of Consultative Meeting(s) and List of Attendees (Agency):

The Department of Toxic Substances Control (DTSC) and the Consultative Work Group (CWG) conducted face-to- face meetings and teleconference calls as frequently as the project warranted. During FY 17/18, face-to-face meetings were held on July 19, 2017, October 18, 2017, February 28, 2018, and May 16, 2018. The Geo/Hydro Technical Subcommittee (TWG) of the CWG also meets periodically. During FY 17/18, a face-to-face TWG meeting was held on August 16, 2017. The Clearinghouse Task Force (CTF) held face-to-face meetings on July 18, 2017, August 15, 2017, October 17, 2017, February 27, 2018, March 13, 2018, April 17, 2018, May 15, 2018, and June 19, 2018. In addition, the CTF also held a phone conference on September 19, 2017

Participants at the CWG meetings included members of local, state and federal government stakeholder agencies, as well as representatives of the Indian Tribe (CIT), Indian Tribe, Indian Tribe (CRIT), Fort Mojave Indian Tribe (FMIT), and Indian Tribe. Each meeting agenda and significant issues from previous consultative meetings were provided to all participants. A list of attendees of face-to-face meetings held during FY 17/18 is provided as Attachment A. A list of all CWG Members and Tribal Representatives notified and invited to attend the CWG and TWG meetings is provided as Attachment B. A list of everyone notified and invited to attend Sub-Committee meetings, such as the Clearinghouse Task Force, is provided as Attachment C.

2. Recent Public Comment/Participation:

Information Repositories and Topock Website

DTSC maintains three project repositories in at Needles, Havasu Lake (within the Chemehuevi Indian Reservation), and Cypress. In addition, DTSC maintains three duplicate repositories in at Golden Shores, , and one in Parker (within the Colorado River Indian Tribes Library). DTSC previously also maintained a repository at the Parker public library. However, due to lack of interest and use, it was closed during the annual visit in October 2017. Information repository compact discs (cds) were prepared and delivered each quarter during FY 17/18 containing the previous quarter’s information. DTSC added a visitor log to the “welcome binder” with instructions for use in the information repositories with the 1st quarter updates. This included instructions for contacting DTSC’s public outreach specialist for document requests or access issues. The annual Topock information repositories audit occurred during October 2017. Items identified as missing were replaced.

During each quarter of FY 17/18, DTSC also updated the DTSC Topock Project website with documents from the previous quarter. DTSC updated the project website during the 4th Quarter of FY 17/18 in anticipation of the release of the Final Subsequent Environmental Report (SEIR) in April 2018.

Community Outreach

On May 4, 2018, a Fact Sheet “Pacific Gas & Electric Company (PG&E) Topock Compressor Station, Environmental Investigation Update” and SEIR certification were mailed to all interested parties and stakeholders.

Two Open Houses were held in April 2018, in Needles California on April 17, 2018 and Golden Shores, Arizona on April 18, 2018. The Open Houses provided information to communities on anticipated construction at the site.

Three Orientation classes for people new to the project were held on May 8-10, 2018 and attended by approximately 45 people.

On June 27, 2018, a project initiation meeting for the Groundwater Remedy Phase I Construction Mobilization was held in Golden Shores, Arizona.

Tribal Outreach

On July 18, 2017, DTSC met with Tribal representatives from Fort Mojave, Chemehuevi, Hualapai and Cocopah Indian Tribes. The purpose of the meeting was to discuss the proposed communication strategy/protocol flow chart for Future Activity Allowance in the SEIR.

On August 14, 2017, DTSC Executive Staff met with Tribal representatives from Fort Mojave, Chemehuevi, and Cocopah Indian Tribes. The purpose of this meeting was to discuss DTSC responses to tribal comments on the Draft SEIR prior to finalization of the document.

On August 15, 2017, DTSC/DOI held a meeting with the Fort Mojave, Cocopah, Chemehuevi, Colorado River and Hualapai Indian Tribes on issues observed during annual archaeological site assessments. PG&E, Bureau of Reclamation and Bureau of Land Management representatives also attended.

On August 19-20, 2017, DTSC met with representatives from the Chemehuevi, Cocopah, Colorado River, Fort Mojave, and Hualapai Indian Tribes to discuss tribal comments on draft SEIR mitigation measures.

On September 13, 2017, DTSC/DOI met with representatives of the Fort Mojave, Colorado River, Chemehuevi, Cocopah, and Hualapai Indian Tribes to discuss development of a protocol for consultation during construction. Additional meetings was held on October 17, 2017, December 6, 2017, February 7, 2018, and April 3, 2018.

On December 4, 2017, DTSC met with a Hualapai Indian Tribe representative in response to the Tribal request letter dated August 18, 2017 to revisit the final remedial technology using Pump and Treat in lieu of the selected groundwater remedy. DTSC concluded that there were no legal basis or technical advantage to change the adopted in-situ remedy.

On December 5, 2017, DTSC met with the Fort Mojave, Colorado River, Chemehuevi, and Hualapai Indian Tribes regarding the mitigation measures of the SEIR.

On January 17, 2018, DTSC met with Fort Mojave Indian Tribe regarding consultation/settlement legal issues as it pertains to the SEIR.

On January 30, 2018, DTSC held a follow-up meeting with the Fort Mojave, Chemehuevi, Colorado River, and Hualapai Indian Tribes regarding the mitigation measures of the Groundwater Final Remedy and SEIR.

On February 21, 2018, Fort Mojave Indian Tribe leaders met with DTSC leadership to resolve specific concerns with the mitigation measures for the Groundwater Final Remedy/SEIR.

On May 16, 2018, DTSC held a clarification meeting with tribes on DTSC’s direction to PG&E on the Human Health Risk Assessment. Representatives from the Chemehuevi, Cocopah, Colorado River, Fort Mojave and Hualapai Indian Tribes attended, as well as DOI and USFWS.

On June 20, 2018, DTSC and Tribal representatives from Chemehuevi, Cocopah, Colorado River, Fort Mojave, and Hualapai Indian Tribes met to coordinate the implementation of several SEIR Mitigation Measures for PG&E Topock Groundwater Remediation.

Topock Site Mailing List Update

DTSC continued to maintain the mailing list throughout FY 17/18 by updating it with new information as needed. A comprehensive update of the mailing list was conducted in preparation for the Fact Sheet mailing in April 2018.

3. Describe the Potential or Known Areas of Concern:

DTSC continues to oversee PG&E in evaluating what is needed to protect the beneficial uses of the Colorado River. From 1951 to 1964, untreated wastewater containing hexavalent chromium was discharged into an area known as the Bat Cave Wash (a dry streambed near the Colorado River). This resulted in a plume of hexavalent chromium contamination in the groundwater beneath the facility which now extends beneath the floodplain adjacent to the Colorado River. The groundwater plume extends under federal property, managed and overseen by the Department of Interior. In addition, there are localized areas within or around the Topock Compressor Station (TCS) where chromium, hexavalent chromium, and other compounds (such as other metals, semi-volatile organic compounds, asbestos), have been found in soils. These occurrences are related to disposal and handling practices when chromium was used at the site. DTSC anticipates that these localized areas of soil contamination will be addressed in the soil Corrective Measures Study (CMS) and final remedy. The majority of the potential and known areas of concern are situated on lands either owned by PG&E or DOI (managed by the BLM and the U.S. Fish and Wildlife Service). Some Native American Tribes have significant cultural and religious affiliations with the landscape. The entire project area has been designated by BLM as a Traditional Cultural Property of the Mohave people. The project site also includes habitat that supports a diverse biological ecology including several fully protected species. 4. Current Phase of Action:

Groundwater Remedy

• Coordination continued throughout the fiscal year with the Moabi Regional Park concessionaire in regard to the informational Outreach Trailer, and with CalTrans, California State Lands Commission, and BNSF Railways on access for remedy implementation. On September 5, 2017, DTSC, DOI and PG&E met with the State Lands Commission to discuss access to disputed land for remedy implementation.

• BLM/BOR reviewed the Cultural Impact Mitigation Program (CIMP) and provided clarification comments to DTSC for federal requirement reconciliation on August 29, 2017. DTSC, BLM, BOR and PG&E will collaborate on the necessary CIMP revisions.

• At DTSC’s and BLM’s direction, PG&E revised the Draft Cultural and Historic Properties Treatment Plan (Treatment Plan) and submitted it to BLM on March 24, 2018. BLM sent the draft Treatment Plan to the Programmatic Agreement signatories, invited signatories, and tribes on March 26, 2018, requesting comments no later than April 30, 2018. CA SHPO, FMIT and PG&E responded with comments. BLM is in the process of finalizing the Treatment Plan.

• On October 13, 2017, DTSC and DOI provided a joint response letter to tribal inquiries (Cocopah, Hualapai, and FMIT) regarding the Final Design Directives specific to Groundwater Modeling Updates on the Groundwater Remediation Project.

• On November 1, 2017, DTSC responded to PG&E comments dated July 27, 2017 titled “Response to California Department of Toxic Substances Control’s March 13, 2017 Memorandum” on well salinity stratification. DTSC requested further data and clarification from PG&E on this issue. PG&E prepared a response that with salinity graphs for every monitoring well at the site. DTSC has directed PG&E to reconfigure four deep wells to possibly resolve and to provide additional observations on the unexplained vertical salinity profiles.

• On 12/22/17, DTSC circulated the Final Groundwater Subsequent Environmental Impact Report (FSEIR) with response to comments.

• On 4/24/18, DTSC responded to comments received on the Final SEIR from the Cocopah, Fort Mojave, and Hualapai Indian Tribes.

• On 4/24/18, DTSC certified the Final SEIR and the Notice of Determination was filed with the State Office of Planning and Research. The Final SEIR and other project related documents were made available to the general public for review and download.

• On 4/24/18, DTSC provided acceptance and conditional approval to PG&E of the Groundwater Remedy Design and Corrective Measures Implementation Work Plan.

• On 4/24/18, DTSC provided response letters to the Cocopah and Fort Mojave Indian Tribes in response to the agencies groundwater modeling directives.

• PG&E and DTSC signed a Land Use Covenant on May 23, 2018 for PG&E Topock Compressor Station and submitted it to San Bernardino County for recording. The Land Use Covenant was recorded by San Bernardino County on July 18, 2018.

Soil Investigation EIR

• On August 16, 2017, a Technical Workgroup meeting was held to demonstrate sample exposure point concentration (EPC) calculation approach to Tribes and Stakeholders.

• On August 18, 2017, DTSC and Tribes provided comments to DOI on PG&E’s Dioxins/ Furans Ambient/Background Study technical memorandum. DOI’s direction letter to finalize the document was sent to PG&E on September 22, 2017. PG&E revised the technical memorandum on October 13, 2017, and DOI provided additional comments on October 26, 2017. PG&E submitted a final revision on November 14, 2017 which DOI approved on November 16, 2017.

• On November 17, 2017, DTSC provided a direction letter to PG&E on completion of the Risk Assessment. PG&E was directed to include additional risk evaluations to better support risk management decision making and requested submittal of the Draft Risk Assessment by April 30, 2018. PG&E is currently performing the Soil Risk Evaluation and preparing the Soil Risk Assessment Report. It is anticipated to be sent to DTSC on September 10, 2018.

• PG&E continues preparation of the Soil RFI/RI Report. PG&E is also preparing the TCS Soil Management Plan which is a requirement of the Land Use Covenant.

• On May 15, 2018, PG&E submitted a Soil Investigation Data Summary Report in response to a request by DOI on April 4, 2018.

(Specific activities continued in Section 12) 5. Proposed Site Use (check the appropriate box[es]):  Commercial/Industrial/Retail □ Residential (single/Multi-family, Sale/rental product)  Park or Open Space □ Schools, Hospitals Day Care Centers or Other Non-Industrial Sensitive Uses

6. List any Technical Problems: N/A

7. Permits Required/Issued to Date and Pending Permit Issues: None

8. Deed Restriction/Land Use Control in Place? □ Yes No Effective Date: ______

9. Engineering Controls (check applicable controls in place): Air Sparging Construct Landfill Cell X Fence Site Remove Free Product X Capped Site Containment Barrier X In Situ Treatment Soil Vapor Extraction Consolidate and Cap Dual Phase Extraction Passive Venting Treatment at Hookup Passive Vent under Enhanced Monitored Natural X Pump and Treat Structure Biodegradation Attenuation Groundwater Vent Soil OTHER (specify):

10. Target Cleanup Levels/Current Contamination Levels:

Remedial action objectives (RAOs) for groundwater contaminants were presented in the Groundwater CMS and the Statement of Basis. The Statement of Basis was published on January 31, 2011. The Final Design for the Groundwater Remedy and the Construction/Remedial Action Work Plan were approved with the certification of the Final SEIR on April 24, 2018 by DTSC PG&E is implementing an Interim Measure (IM) consisting of groundwater extraction for hydraulic control of the plume boundaries in the Colorado River floodplain and management of extracted groundwater. The groundwater extraction, treatment, and injection systems, collectively, are referred to as Interim Measure Number 3 (IM-3). Currently, the IM-3 facilities include a groundwater extraction system (four extraction wells: TW-2D, TW-3D, TW-2S, and PE-1), conveyance piping, a groundwater treatment plant, and an injection well field for the discharge of the treated groundwater (two injection wells: IW-2 and IW-3). As of June 30, 2018, IM-3 has extracted and treated approximately 860 million gallons of water and removed approximately 7,430 pounds of chromium from groundwater. Construction on the Groundwater Remedy is scheduled to begin October 2018. ______

11. Ongoing Monitoring (specify timeframes and/or describe “Other”): Groundwater □ Air Other Specify: Colorado River Sampling and Monitoring The current Groundwater Monitoring Program includes over 140 monitoring wells. Sampling for hexavalent chromium and chromium occurs: • monthly in 2 extraction wells, • monthly in 4 river shoreline locations, 2 other surface water monitoring locations, and 10 in-channel river locations during low river periods in winter, • quarterly in 22 wells, 4 river shoreline locations, 2 other surface water monitoring locations, and 10 in-channel river locations, • semiannually in 101 wells, 4 river shoreline locations, 2 other surface water monitoring locations, and 10 in- channel river locations, • annually in 142 wells, 4 river shoreline locations, 2 other surface water monitoring locations, and 10 in-channel river locations, and • biennially in 146 wells, 4 river shoreline locations, 2 other surface water monitoring locations, and 10 in- channel river locations,

The frequencies noted above apply to the Topock groundwater and surface water monitoring program, and do not include other monitoring programs such as the Compliance Monitoring Program (CMP).

Oversight Agency Costs Reimbursed to Date: DTSC labor expenditures for July 2017 – June 2018: DTSC spent 5,406 hours with an oversight cost of approximately $1,453,521.00

12. Additional Comments or Issues – add additional pages as needed

(Continued from Section 4)

Surveys

• A late season botanical survey of the Final Topock Groundwater Remedy construction footprint was conducted from September 13 – 14, 2017. The report of this survey was submitted to DTSC on March 5, 2018.

• The Southwestern Willow Flycatcher (SWFL) protocol bird surveys occurred on May 15 - 19, June 5 - 9; and June 19 - 23, 2017, and July 10-14, 2017. The 2017 Southwestern Willow Flycatcher Presence/Absence Survey Report was submitted October 31, 2017.

• The Groundwater Remediation Project Pre-Construction Floristic Survey Report – Spring 2017 was submitted on October 31, 2017 and included results from the March 2017 survey.

Wells

• With DTSC’s conditional approval on July 20, 2015, extraction well PE-1 (part of IM3 extraction network), has been running intermittently since January 2016. PG&E has continued to monitor the hydraulic gradient at prescribed gradient well pairs and chromium concentrations at select floodplain wells as directed in DTSC’s July 20, 2015 conditional approval letter. PG&E has also submitted monthly snapshots of IM3 Pumping Regime and Hydraulic Performance following this change to pumping at PE-1 (as an action item from the July 22, 2015 CWG). The average landward gradient at the prescribed gradient well pairs during FY 17/18 is detailed below: • June 2017, July 2017, and August 2017 was 0.0035, 0.0039, and 0.0064 foot/foot (ft/ft), respectively. • September 2017, October 2017, and November 2017 was 0.0035, 0.0035, and 0.0036 foot/foot (ft/ft), respectively. • December 2017, January 2018, and February 2018 was 0.0034, 0.0033, and 0.0041 foot/foot (ft/ft), respectively. • March 2018, April 2018, and May 2018 was 0.0043, 0.0040, and 0.0042 foot/foot (ft/ft), respectively

Results from each month exceeded the target gradient of 0.001 ft/ft.

• On August 18, 2017, DTSC approved a modification to gradient pairs to replace MW-45-095a with MW-20-130.

• On March 30, 2018, PG&E submitted a Work Plan for Historical Water Supply Well Reconnaissance pursuant to the request in the September 27, 2016 letter regarding Gathering of Historical Well Information at Pacific Gas and Electric Company. On June 13, 2018, the Geological Services Unit (GSU) of the DTSC provided comments to the work plan.

Monitoring Programs

• The Annual Site Conditions Assessment occurred November 6-9, 2017. The Annual Site Conditions report was submitted to DTSC and BLM on December 26, 2017.

• On July 31, 2017, PG&E submitted a response to DTSC’s April 6, 2017 Memorandum regarding a proposal for an alternative groundwater sampling trial. DTSC provided a response on October 20, 2017. PG&E provided a brief response/clarification in January 2018. Results of the alternative groundwater sampling trial is anticipated in 2018.

• PG&E is implementing the EIR Mitigation Monitoring and Reporting Program requirements in the Groundwater EIR and Soil Investigation EIR. PG&E has been submitting quarterly compliance reports. EIR Mitigation Measures Compliance Reports for the Final Groundwater Remedy and Soil Investigation were submitted on July 31, 2017, October 31, 2017. January 31, 2018, and April 30, 2018. The next quarterly report will include the mitigation measures from the Final SEIR and conditions of approval in DTSC’s April 24, 2018 approval of the Final Design.

• Implementation of the groundwater and surface water monitoring program continued during FY 17/18. Groundwater monitoring events were completed in October 2017, December 2017, February 2018, and May 2018.

Activities during FY 17/18 related to ongoing implementation of the Interim Measure included the following:

• Continuous operation of the Interim Measure groundwater extraction, treatment, and injection facility continued throughout FY 17/18. Periodic downtimes associated with optimization, maintenance, and repair occurred in conformance with pre-determined conditions.

• PG&E completed required monitoring and reporting of treatment plant operations as required by the Applicable, Relevant and Appropriate (ARARs) under DOI oversight. The IM-3 self-monitoring reports were submitted on July 14, 2017, October 15, 2017, January 12, 2018 and April 13, 2018.

• Performance Monitoring Program (PMP) activities in the Colorado River floodplain continued in FY 17/18. Quarterly PMP/GMP reports were submitted on August 15, 2017, December 15, 2017, March 15, 2018, and April 30, 2018.

INSTRUCTIONS FOR COMPLETING A STATUS REPORT

GENERAL: This Status Report form is for use in communicating to Cal/EPA the activities of the Administering Agency and Support Agencies with respect to site investigation and remedial action. A Status Report should be completed following the initial Consultative Work Group meeting. Subsequently, an annual report should be completed each year for the period ending June 30th. A Status Report should also be completed at the end of a designated project. Type or print clearly all requested information in the spaces provided and attach additional pages as necessary to explain or complete your responses. Mail the Status Reports to:

California Environmental Protection Agency 1001 I Street, 25th Floor Site Designation Committee Sacramento, CA 95814

1. Date of Consultative Work Group Meeting and List of Attendees: List date(s) of Consultative Work Group Meeting(s) that occurred during the year, including names of attendees followed by agency affiliation in parenthesis. If initial status report, attach summary of the first Consultative Work Group Meeting.

2. Recent Public Comment/Participation: List documents received in the year subject to public comment or public meetings/hearings held and what you did to provide for public participation.

3. Describe Known or Potential Areas of Concern: Describe the site investigative or remedial activities occurring at the site and issues for the year.

4. Current Phase of Action under the Site Designation Process

List current phase of action corresponding to description provided below by assigning a number followed by an appropriate letter, if applicable (i.e. Work Plan Completed denote as level 3D).

Number Description

1 Administering Agency Designated 2 First Consultative Meeting Completed 3 Levels of Action A - Preliminary Site Assessment Completed B - Site Investigation Completed C - Feasibility Study Completed D - Work Plan Completed E - Cleanup Alternative Selected and Authorized F - Design of Cleanup Alternative Selected G - Implementation of Cleanup Alternative (give % complete) H - Remediation Completed 4 Certificate of Completion Issued (after concurrence by other interested agencies).

5. Proposed Site Use: Check the appropriate box or boxes which describe the planned use for the site: (1) Commercial/Industrial/Retail; (2) Residential (single/multi-family, sale/rental product); (3) Park or Open space; (4) Schools, Hospitals, Day Care Centers or Other Non-residential Sensitive Uses.

6. List any Technical Problems: Describe any technical issues impeding site investigative or cleanup activities.

7. Permits Required/Issued to Date and Pending Permit Issues: List any permits currently being required and/or issued by the Administering or Support Agency. List any permits currently pending approval and any requirements yet to be fulfilled by the Responsible Party.

8. Deed Restrictions/Land Use Controls: Check applicable box and specify the date if the response is “yes.”

9. Cleanup Levels: Specify current contamination levels and proposed target cleanup levels for major contaminants.

10. Ongoing Monitoring: Check the appropriate box(es) and/or specify any other type of ongoing monitoring that is in place. Specify approximate timeframes (using months/years) for monitoring, i.e., 11/06 – 1/10

11. Oversight Agency Costs Reimbursed to Date: For the project, list agency, amount reimbursed followed by pending reimbursement in parenthesis, and brief description of services provided by each agency.

12. Additional Comments or Issues: If needed, attach additional sheets to describe any important issues not previously addressed above such as issues discussed at last Consultative Work Group Meeting. In the event the project takes less than a year to complete, there need only be one report completed and submitted at the end of the project. Please attach a copy of any Certificate of Completion and/or closure letter issued when submitting the final report.

Cal/EPA -- Site Designation Committee -- Status Report Form 5/06 PG&E Topock Compressor Station Annual Status Report July 2017 – June 2018

ATTACHMENT A – Dates of Meetings and Lists of Attendees (Agencies)

July 18, 2017 – Clearinghouse Task Force Face-to-Face Meeting Attendees: Department of Toxic Substances Control (DTSC): Karen Baker, Yolanda Garza; U.S. Bureau of Land Management (BLM): Renee Kolvet, Jason West, Gloria Bullets Benson (phone); US Bureau of Reclamation (USBOR): Jeffery Smith; California Regional Water Quality Control Board (CRWQCB): Jose Angel; Colorado River Indian Tribe (CRIT): Jennifer Corona, Toni Carlyle; Cocopah Indian Tribe: Edgar Castillo (phone); Fort Mojave Indian Tribe (FMIT): Nora McDowell; H&A on behalf of FMIT: Leo Leonhart; Hualapai: Dawn Hubbs; Pacific Gas & Electric Company (PG&E): Kevin Sullivan, Curt Russell, Jose Moreno, Jennifer Darcangelo (phone); CH2M Hill on behalf of PG&E: Christina Hong; Arcadis on behalf of PG&E: Lisa Micheletti-Cope, Kristin Mancini (phone); U.S. Department of the Interior (USDOI): Pam Innis; Metropolitan Water District (MWD): Maria Lopez; Chemehuevi Indian Tribe (CIT): Ron Escobar; Technical Review Committee (TRC): Margaret Eggers

July 19, 2017 – Consultative Work Group Face-to-Face Meeting Attendees: DTSC: Dot Lofstrom, Karen Baker, Yolanda Garza, Aaron Yue, Isabella Alasti, Chris Guerre (phone), Jose Marcos (phone), Lori Hare (phone); CRWQCB: Jose Angel, Jose Cortez (phone); PG&E: Kevin Sullivan, Curt Russell, Jose Moreno-Jimenez; CH2M Hill on behalf of PG&E:; Arcadis on behalf of PG&E: Lisa Micheletti-Cope, Kristin Mancini (phone); Pivox on behalf of PG&E: Marty Bloes; USBLM: Renee Kolvet, Gloria Bullets Benson (phone); USBOR: Mark Slaughter, Jeff Smith; USDOI: Pam Innis; MWD: Maria Lopez, Jill C. Teraoka (phone); Arizona Department of Environmental Quality (ADEQ): Nichole Osuch (phone); CIT: Ron Escobar; Cocopah Indian Tribe: Edgar Castillo (phone), Jill McCormick (phone); CRIT: Toni Carlyle, Jennifer Corona; FMIT: Nora McDowell, Leo Leonhart (H&A); Hualapai Indian Tribe: Dawn Hubbs; TRC: Margaret Eggers, Charlie Schlinger, Eric Rosenblum, Robert Prucha

August 15, 2017 – Clearinghouse Task Force Face-to-Face Meeting Attendees: DTSC: Dot Lofstrom, Karen Baker, Yolanda Garza (phone); USDOI: Pam Innis; PG&E: Jennifer Darcangelo, Curt Russell (phone); CH2M Hill on behalf of PG&E: Christina Hong (phone); Arcadis on behalf of PG&E: Lisa Micheletti-Cope, Kristin Mancini (phone); BLM: Renee Kolvet, Jason West, David Korzilius; MWD: Maria Lopez (phone); BOR: Jeff Smith; FMIT: Nora McDowell, Leo Leonhart, H&A (phone); CRIT: Toni Carlyle (phone); Cocopah: Edgar Castillo, Jill McCormick; Chemehuevi: Ron Escobar; Hualapai: Dawn Hubbs; TRC: Margaret Eggers

August 16, 2017 – Technical Work Group Face-to-Face Meeting Attendees: DTSC: Aaron Yue, Karen Baker, Shukla Roy-Semmen, Yolanda Garza, Chris Guerre (phone), Mike Eichelberger (phone); DOI: Pam Innis; PG&E: Jose Moreno, Aaron Osborne (phone), Curt Russell (phone); On behalf of PG&E: CH2M Hill: Christina Hong (phone), Keith Sheets (phone); Integral: Mala Pattanayek; Arcadis: Matt Butcher, Lisa Micheletti Cope, Krisin PG&E Topock Designated Site Annual Status Report FY 17/18 Attachment A Page 2

Mancini; Iris Env: Adrienne LaPierre; BLM: Renee Kolvet, Doug Cox, Gloria Benson (phone); MWD: Maria Lopez (phone); USFWS: Carrie Marr; BOR: Jeffery Smith; Department of Transportation (DOT): Dennis Smith; FMIT: Nora McDowell, Michael Sullivan, Leo Leonhart, H&A (phone); Hualapai: Dawn Hubbs; CRIT: Jennifer Corona; Cocopah: Jill McCormick, Edgar Castillo; TRC: Eric Rosenblum, Charlie Schlinger, Bob Prucha, Margaret Eggers

September 19, 2017 – Clearinghouse Teleconference Meeting Attendees: DTSC: Karen Baker, Yolanda Garza; USDOI: Pam Innis; PG&E: Kevin Sullivan, Curt Russell, Jose Moreno; CH2M Hill on behalf of PG&E: Christina Hong; Arcadis on behalf of PG&E: Kristin Mancini, Steven Perry; BLM: Renee Kolvet; MWD: Maria Lopez; FMIT: Nora McDowell, Leo Leonhart, H&A; Cocopah: Edgar Castillo, Jill McCormick; TRC: Margaret Eggers

October 17, 2017 – Clearinghouse Taskforce Face-to-Face Meeting Attendees: DTSC: Dot Lofstrom, Karen Baker, Yolanda Garza, Aaron Yue; USDOI: Pam Innis; PG&E: Kevin Sullivan, Curt Russell, Jennifer D’Arcangelo; CH2M Hill on behalf of PG&E: Christina Hong (phone); Arcadis on behalf of PG&E: Lisa Micheletti Cope, Kristin Mancini (phone); BLM: Gloria Benson (phone), Renee Kolvet; BOR: Jefferey Smith; MWD: Maria Lopez (phone); FMIT: Nora McDowell, Leo Leonhart (H&A); CRIT: Jennifer Corona, Toni Carlyle, Winston Escobar; Cocopah: Jill McCormick, Edgar Castillo; Hualapai: Dawn Hubbs; CIT: Ron Escobar; TRC: Margaret Eggers

October 18, 2017 – Consultative Work Group Face-to-Face Meeting Attendees: DTSC: Dot Lofstrom, Karen Baker, Yolanda Garza, Aaron Yue, Isabella Alasti, Chris Guerre (phone), Lori Hare (phone); PG&E: Kevin Sullivan, Curt Russell, Matt Dudley, Juan Jayo; CH2M Hill on behalf of PG&E: Christina Hong; Arcadis on behalf of PG&E: Lisa Micheletti-Cope; USBLM: Renee Kolvet, Gloria Bullets Benson (phone); USBOR: Jeff Smith; USDOI: Pam Innis; Geopentech on behalf of DOI: Eric Fordham; MWD: Maria Lopez, Jill C. Teraoka (phone); Arizona Department of Environmental Quality (ADEQ): Nichole Osuch (phone); Cocopah Indian Tribe: Edgar Castillo, Jill McCormick; CRIT: Toni Carlyle (phone), Jennifer Corona (phone); FMIT: Nora McDowell, Michael Sullivan, Leo Leonhart (H&A); Hualapai Indian Tribe: Dawn Hubbs; TRC: Margaret Eggers, Charlie Schlinger, Robert Prucha

February 27, 2018 – Clearinghouse Taskforce Face-To-Face Meeting Attendees: DTSC: Karen Baker, Yolanda Garza; USDOI: BLM: Gloria Bullets Benson (phone); CRWQCB: Scot Stormo; USFWS: Carrie Marr; PG&E: Curt Russell; CH2M Hill/Jacobs on behalf of PG&E: Christina Hong; Arcadis on behalf of PG&E: Lisa Micheletti Cope, Steven Perry (phone); BLM: Renee Kolvet (phone); MWD: Maria Lopez; FMIT: Nora McDowell, Leo Leonhart (H&A); Cocopah: Edgar Castillo (phone); Hualapai: Dawn Hubbs; CIT: Ron Escobar; CRIT: Toni Carlyle, Bryan Etsitty, Rena Van Fleet, Doug Bonamici (phone); TRC: Margaret Eggers

PG&E Topock Designated Site Annual Status Report FY 17/18 Attachment A Page 3

February 28, 2018 – Consultative Work Group Face-to-Face Meeting Attendees: DTSC: Karen Baker, Aaron Yue, Isabella Alasti, Yolanda Garza, Chris Guerre (phone), Lori Hare (phone), Shukla Roy-Semmen (phone); ESA on behalf of DTSC: Addie Farrell; PG&E: Curt Russell; CH2M Hill on behalf of PG&E: Christina Hong; Arcadis on behalf of PG&E: Lisa Micheletti-Cope; CWRCB: Scot Stormo; USBLM: Gloria Bullets Benson (phone), Renee Kolvet (phone); MWD: Maria Lopez; USFWS: Carrie Marr; CRIT: Doug Bonamici, Bryan Etsitty, Rena Van Fleet; TRC: Margaret Eggers, Robert Prucha, Eric Rosenblum, Charlie Schlinger; Chemehuevi: Steven Escobar; Hualapai: Dawn Hubbs; FMIT: Nora McDowell, Leo Leonhart (H&A)

March 13, 2018 – Clearinghouse Taskforce Face-To-Face Meeting Attendees: DTSC: Karen Baker, Yolanda Garza; USDOI: Pam Innis (phone); BLM: Adam Cochran, Gloria Bullets Benson (phone); CRWQCB: Scot Stormo (phone); PG&E: Curt Russell; CH2M Hill on behalf of PG&E: Christina Hong (phone); Arcadis on behalf of PG&E: Lisa Micheletti Cope; BLM: Renee Kolvet; MWD: Maria Lopez (phone); FMIT: Nora McDowell, Leo Leonhart (H&A); Cocopah: Jill McCormick (phone); CIT: Ron Escobar; CRIT: Doug Bonamici (phone); TRC: Margaret Eggers

April 17, 2018 – Clearinghouse Taskforce Face-To-Face Meeting Attendees: DTSC: Karen Baker, Yolanda Garza; USDOI: Pam Innis; BLM: Gloria Bullets Benson (phone); PG&E: Curt Russell, Jennifer Darcangelo (phone); CH2M Hill on behalf of PG&E: Christina Hong (phone); Arcadis on behalf of PG&E: Lisa Micheletti Cope, Steven Perry (phone), Kevin Sullivan (phone); MWD: Maria Lopez (phone); FMIT: Nora McDowell, Leo Leonhart (H&A); CIT: Ron Escobar; Cocopah: Edgar Castillo (phone), Winston Escobar (phone); CRIT: Doug Bonamici (phone); Hualapai: Dawn Hubbs; TRC: Margaret Eggers

May 15, 2018 – Clearinghouse Taskforce Face-To-Face Meeting Attendees: DTSC: Karen Baker, Yolanda Garza; USDOI: Pam Innis; BLM: Jason West (phone), Gloria Bullets Benson (phone); PG&E: Kevin Sullivan (phone), Curt Russell, Jennifer Darcangelo (phone); CH2M Hill on behalf of PG&E: Christina Hong Jacobs (phone); Arcadis on behalf of PG&E: Lisa Micheletti Cope, Steven Perry (phone); MWD: Maria Lopez (phone); FMIT: Nora McDowell, Leo Leonhart (H&A); CIT: Ron Escobar; Cocopah: Edgar Castillo (phone); CRIT: Rena Van Fleet, Anita Flores; Hualapai: Lyndee Hornell, Dawn Hubbs; TRC: Margaret Eggers

May 16, 2018 – Consultative Work Group Face-to-Face Meeting Attendees: DTSC: Karen Baker, Aaron Yue, Isabella Alasti, Yolanda Garza, Chris Guerre (phone), Jose Marcos (phone), Lori Hare (phone); ESA on behalf of DTSC: Addie Farrell, Monica Strauss; USDOI: Pam Innis; PG&E: Curt Russell, Matt Dudley (phone); CH2M Hill on behalf of PG&E: Christina Hong; Arcadis on behalf of PG&E: Lisa Micheletti-Cope; Pivox on behalf of PG&E: Shakeel Jogia; USBLM: Gloria Bullets Benson (phone), Adam Cochran, Jason West (phone); ADEQ: Richard Orens (phone); MWD: Jill Teraoka, Betty Kuo Brinton (phone); CRB: Lindia Liu (phone); Cocopah: Edgar Castillo; CRIT: Rena Van Fleet, Anita Flores; TRC: Margaret Eggers, PG&E Topock Designated Site Annual Status Report FY 17/18 Attachment A Page 4

Robert Prucha, Eric Rosenblum, Charlie Schlinger; Chemehuevi: Ron Escobar; Hualapai: Dawn Hubbs; FMIT: Nora McDowell, Michael Sullivan, Leo Leonhart (H&A)

June 19, 2018 – Clearinghouse Taskforce Face-To-Face Meeting Attendees: DTSC: Karen Baker, Yolanda Garza, Aaron Yue; USDOI: Pam Innis; BLM: Adam Cochran, Anna Rago, Gloria Benson (phone); PG&E: Curt Russell, Jennifer Darcangelo, Glenn Caruso; CH2M Hill on behalf of PG&E: Christina Hong Jacobs (phone); Arcadis on behalf of PG&E: Lisa Micheletti Cope, Steven Perry; MWD: Maria Lopez (phone); FMIT: Nora McDowell, Chris Harper, Leo Leonhart (H&A); CIT: Ron Escobar, Winston Escobar; Cocopah: Edgar Castillo, Justin Brundin; CRIT: Toni Carlyle (phone); Hualapai: Dawn Hubbs; TRC: Margaret Eggers

PG&E Topock Compressor Station Annual Status Report July 2017 – June 2018

ATTACHMENT B – Invitees to Consultative Work Group Meetings

July 18, 2017 – Consultative Work Group Face-to-Face Meeting Notified and Invited: Arizona Department of Environmental Quality (ADEQ), California Department of Fish and Wildlife (CDFW), California Regional Water Quality Control Board (CRWQCB), California Water Resources Control Board (CWRCB), Chemehuevi Indian Tribe (CIT), Coachella Valley Water District, Cocopah Indian Tribe, Colorado River Board of California (CRB), Colorado River Indian Tribes (CRIT), Department of Toxic Substances Control (DTSC) and their consultant Environmental Science Associates (ESA), Eggers Environmental, EN3 Professionals, LLC, Fort Mojave Indian Tribe (FMIT) and their consultants Hargis & Associates, Law Office of Courtney Ann Coyle, and The McDonald Law Firm, LC, Fort Yuma- Indian Tribe, HDR Engineering, Hualapai Indian Tribe, Indian Health Services (IHS), Integrated Hydro Systems, LLC, Metropolitan Water District (MWD) and their consultant Geopentech, Mohave County Department of Public Health (DPH), Pacific Gas and Electric (PG&E) and their consultants Arcadis, CH2M Hill, and Pivox, Rosenblum Environmental, Torres-Martinez Desert Indian Tribe, Twenty-Nine Palms Indian Tribe, US Bureau of Land Management (USBLM), US Bureau of Reclamation (USBOR), US Department of Interior (USDOI) and their consultants Summit, and KM Power Consulting, US Environmental Protection Agency (USEPA), US Fish and Wildlife Service (USFWS)

August 16, 2017 – Geo/Hydro Technical Subcommittee Face-to-Face Meeting Notified and Invited: ADEQ, CDFW, CRWQCB, CWRCB, CIT, Coachella Valley Water District, Cocopah Indian Tribe, CRB, CRIT, DTSC and the consultant ESA, Eggers Environmental, EN3 Professionals, LLC, FMIT and their consultants Hargis & Associates, Law Office of Courtney Ann Coyle, and The McDonald Law Firm, LC, Fort Yuma-Quechan Indian Tribe, HDR Engineering, Hualapai Indian Tribe, IHS, Integrated Hydro Systems, LLC, MWD and their consultant Geopentech, Mohave County DPH, PG&E and their consultants Arcadis, CH2M Hill, and Pivox, Rosenblum Environmental, Torres-Martinez Desert Cahuilla Indian Tribe, Twenty-Nine Palms Indian Tribe, USBLM, USBOR, USDOI and their consultants Summit, and KM Power Consulting, USEPA, USFWS

October 18, 2017 – Consultative Workgroup Face-to-Face Meeting Notified and Invited: ADEQ, CDFW, CRWQCB, CWRCB, CIT, Coachella Valley Water District, Cocopah Indian Tribe, CRB, CRIT, DTSC and the consultant ESA, Eggers Environmental, EN3 Professionals, LLC, FMIT and their consultants Hargis & Associates, Law Office of Courtney Ann Coyle, and The McDonald Law Firm, LC, Fort Yuma-Quechan Indian Tribe, HDR Engineering, Hualapai Indian Tribe, IHS, Integrated Hydro Systems, LLC, MWD and their consultant Geopentech, Mohave County DPH, PG&E and their consultants Arcadis, CH2M Hill, and Pivox, Rosenblum Environmental, Torres-Martinez Desert Cahuilla Indian Tribe, Twenty-Nine Palms Indian Tribe, USBLM, USBOR, USDOI and their consultants Summit, and KM Power Consulting, PG&E Topock Designated Site Annual Status Report FY 17/18 Attachment B Page 2

USEPA, USFWS

February 28, 2018 – Consultative Workgroup Face-to-Face Meeting Notified and Invited: ADEQ, CDFW, CRWQCB, CWRCB, CIT, Coachella Valley Water District, Cocopah Indian Tribe, CRB, CRIT, DTSC and the consultant ESA, Eggers Environmental, EN3 Professionals, LLC, FMIT and their consultants Hargis & Associates, Law Office of Courtney Ann Coyle, and The McDonald Law Firm, LC, Fort Yuma-Quechan Indian Tribe, HDR Engineering, Hualapai Indian Tribe, IHS, Integrated Hydro Systems, LLC, MWD and their consultant Geopentech, Mohave County DPH, PG&E and their consultants Arcadis, CH2M Hill, and Pivox, Regional Parks Department, Rosenblum Environmental, Torres-Martinez Desert Cahuilla Indian Tribe, Twenty-Nine Palms Indian Tribe, USBLM, USBOR, USDOI and their consultants Summit, and KM Power Consulting, USEPA, USFWS

May 16, 2018 – Consultative Workgroup Face-to-Face Meeting Notified and Invited: ADEQ, CDFW, CRWQCB, CWRCB, CIT, Coachella Valley Water District, Cocopah Indian Tribe, CRB, CRIT, DTSC and the consultant ESA, Eggers Environmental, EN3 Professionals, LLC, FMIT and their consultants Hargis & Associates, Law Office of Courtney Ann Coyle, and The McDonald Law Firm, LC, Fort Yuma-Quechan Indian Tribe, HDR Engineering, Hualapai Indian Tribe, IHS, Integrated Hydro Systems, LLC, MWD and their consultant Geopentech, Mohave County DPH, PG&E and their consultants Arcadis, CH2M Hill, and Pivox, Regional Parks Department, Rosenblum Environmental, Torres-Martinez Desert Cahuilla Indian Tribe, Twenty-Nine Palms Indian Tribe, USBLM, USBOR, USDOI and their consultants Summit, and KM Power Consulting, USEPA, USFWS

PG&E Topock Compressor Station Annual Status Report July 2017 – June 2018

ATTACHMENT C – Invitees to Sub-Committee Meetings

July 18, 2017 – Clearinghouse Task Force Face-to-Face Meeting Notified and Invited: California Regional Water Quality Control Board (CRWQCB), Chemehuevi Indian Tribe (CIT), Cocopah Indian Tribe, Colorado River Indian Tribes (CRIT), Department of Toxic Substances Control (DTSC), Eggers Environmental, Fort Mojave Indian Tribe (FMIT) and their consultant Hargis & Associates (H&A), Hualapai Indian Tribe; Metropolitan Water District (MWD), Pacific Gas & Electric (PG&E) and their consultants CH2M Hill & Arcadis, US Bureau of Land Management (USBLM), US Department of Interior (USDOI)

August 15, 2017 – Clearinghouse Task Force Face-to-Face Meeting Notified and Invited: CRWQCB, CIT, Cocopah, CRIT, DTSC, Eggers Environmental, FMIT and their consultant H&A, Hualapai Indian Tribe, MWD, PG&E and their consultants CHH2M Hill and Arcadis, USBLM, USDOI

September 19, 2017 – Clearinghouse Task Force Phone Conference Meeting Notified and Invited: CRWQCB, CIT, Cocopah, CRIT, DTSC, Eggers Environmental, FMIT and their consultant H&A, Hualapai Indian Tribe, MWD, PG&E and their consultants CHH2M Hill and Arcadis, USBLM, USDOI

October 17, 2017 – Clearinghouse Task Force Face-to-Face Meeting Notified and Invited: CRWQCB, CIT, Cocopah, CRIT, DTSC, Eggers Environmental, FMIT and their consultant H&A, Hualapai Indian Tribe, MWD, PG&E and their consultants CHH2M Hill and Arcadis, USBLM, USDOI

February 27, 2018 – Clearinghouse Task Force Face-to-Face Meeting Notified and Invited CRWQCB, CIT, Cocopah, CRIT, DTSC, Eggers Environmental, FMIT and their consultant H&A, Hualapai Indian Tribe, MWD, PG&E and their consultants CHH2M Hill and Arcadis, USBLM, USDOI

March 13, 2018 – Clearinghouse Task Force Face-to-Face Meeting Notified and Invited: CRWQCB, CIT, Cocopah, CRIT, DTSC, Eggers Environmental, FMIT and their consultant H&A, Hualapai Indian Tribe, MWD, PG&E and their consultants CHH2M Hill and Arcadis, USBLM, USDOI

PG&E Topock Designated Site Annual Status Report FY 17/18 Attachment C Page 2

April 17, 2018 – Clearinghouse Task Force Face-to-Face Meeting Notified and Invited: CRWQCB, CIT, Cocopah, CRIT, DTSC, Eggers Environmental, FMIT and their consultant H&A, Hualapai Indian Tribe, MWD, PG&E and their consultants CHH2M Hill and Arcadis, USBLM, USDOI

May 15, 2018 – Clearinghouse Task Force Teleconference Meeting Notified and Invited: CRWQCB, CIT, Cocopah, CRIT, DTSC, Eggers Environmental, FMIT and their consultant H&A, Hualapai Indian Tribe, MWD, PG&E and their consultants CHH2M Hill and Arcadis, USBLM, USDOI

June 19, 2018 – Clearinghouse Task Force Teleconference Meeting Notified and Invited: CRWQCB, CIT, Cocopah, CRIT, DTSC, Eggers Environmental, FMIT and their consultant H&A, Hualapai Indian Tribe, MWD, PG&E and their consultants CHH2M Hill and Arcadis, USBLM, USDOI