Generic Template for Final Engineering Report

2139 ADAM CLAYTON POWEL JR. BLVD.

MANHATTAN, NEW YORK Remedial Action Report

NYC VCP Project Number 15CVCP051M OER Project Number 07HPD027M Prepared For: Alembic Development Company, LLC 11 Hanover Square, Suite 701 New York, New York 10005 Attention: Michael McCarthy (212) 566-8805

Prepared By: Nelson, Pope & Voorhis, LLC 572 Walt Whitman Road Melville, New York 11747 631-427-5665

P.E: Thomas Lembo

DECEMBER, 2016

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

REMEDIAL ACTION REPORT TABLE OF CONTENTS TABLE OF CONTENTS ...... 7

LIST OF ACRONYMS ...... 6

CERTIFICATION ...... 6

EXECUTIVE SUMMARY ...... 7

REMEDIAL ACTION REPORT ...... 16

1.0 SITE BACKGROUND 16

1.1 SITE LOCATION AND BACKGROUND ...... 16 1.2 REDEVELOPMENT PLAN ...... 17 1.3 DESCRIPTION OF SURROUNDING PROPERTY ...... 17 1.4 SUMMARY OF PAST SITE USES AND AREAS OF CONCERN ...... 17 1.5 SUMMARY OF WORK PERFORMED UNDER THE REMEDIAL INVESTIGATION ...... 17 1.6 SUMMARY OF FINDINGS OF REMEDIAL INVESTIGATION ...... 17 1.5 REMEDIAL INVESTIGATION ...... 18

2.0 DESCRIPTION OF REMEDIAL ACTIONS Error! Bookmark not defined.

3.0 COMPLIANCE WITH REMEDIAL ACTION WORK PLAN 19

3.1 HEALTH AND SAFETY PLAN ...... 24 3.2 COMMUNITY AIR MONITORING PLAN ...... 24 3.3 SOIL/MATERIALS MANAGEMENT PLAN ...... 24 3.4 STORMWATER POLLUTION PREVENTION ...... 24 3.5 DEVIATIONS FROM THE REMEDIAL ACTION WORK PLAN ...... 24

4.0 REMEDIAL PROGRAM 19

4.1 PROJECT ORGANIZATION ...... 26

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 4.2 SITE CONTROLS ...... Error! Bookmark not defined. 4.3 MATERIALS EXCAVATION AND REMOVAL ...... Error! Bookmark not defined. 4.4 MATERIALS DISPOSAL...... 32 4.5 BACKFILL IMPORT ...... Error! Bookmark not defined. 4.6 DEMARCATION ...... 33

5.0 ENGINEERING CONTROLS 16

6.0 INSTITUTIONAL CONTROLS 16

7.0 SITE MANAGEMENT PLAN 16

8.0 SUSTAINABILITY REPORT 16

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 FIGURES

Figure 1: Site Boundary Map Figure 2: Site Location Map Figure 3: Development Plan Figure 4: Cellar Plan Figure 5-1 through 5-4 : Map showing location and approximate depth of excavations and location of hotspot/tank source removal Figure 6: Map of end-point sample locations Figure 7: Map of backfill location Figure 8: Map of location of Vapor Barrier System Figure 9: Map of location of SSDS System

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 TABLES

Table 1: First Round Building Excavation End Point Sample Analytical Results Table 2: First Round Building Excavation End Point Sample Analytical Results Table 3: Disposal quantities and disposal facilities Table 4: Waste Characterization Grid Sample Results Table 5: Backfill Analytical Results

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 APPENDICES

Appendix 1: Remedial Investigation Report Appendix 2: Remedial Action Work Plan & Stipulation List Appendix 3: Community Air Monitoring Results Appendix 4: Daily and Monthly Reports to OER Appendix 5: Delineation Sampling Report Appendix 6: End-point sample analytical laboratory data Appendix 7: Disposal Characterization Sample Laboratory Testing Results

Appendix 8: Disposal Facility Approval and Approval Letters Appendix 9: Shipping and Disposal Manifests Appendix 10: Backfill Analytical Data Appendix 11: As-built drawings and documentation for Engineering Controls

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

LIST OF ACRONYMS

Acronym Definition CAMP Community Air Monitoring Plan DER-10 NYS DEC Division of Environmental Remediation Technical Guidance Manual 10 EC Engineering Control HASP Health and Safety Plan IC Institutional Control NYC VCP New York City Voluntary Cleanup Program NYC DEP New York City Department of Environmental Protection NYC DOHMH New York City Department of Health and Mental Hygiene NYC OER New York City Office of Environmental Remediation ORC Oxygen Release Compound PID Photoionization Detector QA/QC Quality Assurance/Quality Control QEP Qualified Environmental Professional RAR Remedial Action Report RAWP Remedial Action Work Plan SCG Standards, Criteria and Guidance SCO Soil Cleanup Objective SMMP Soil/Materials Management Plan SMP Site Management Plan SVOCs Semi-Volatile Organic Compounds UST Underground Storage Tank VOCs Volatile Organic Compounds

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

EXECUTIVE SUMMARY Alembic Development Company, LLC has enrolled in the New York City Voluntary Cleanup Program (NYC VCP) to investigate and remediate a property located at 2139 Adam Clayton Powell Jr. Blvd. in the Harlem section of Manhattan, New York. A Remedial Investigation (RI) was performed to compile and evaluate data and information necessary to develop a Remedial Action Work Plan (RAWP). A remedial action was performed pursuant to an OER-approved RAWP in a manner that has rendered the Site protective of public health and the environment consistent with the proposed use of the property. This RAR describes the remedial action performed under the RAWP. The remedial action described in this document provides for the protection of public health and the environment, complies with applicable environmental standards, criteria and guidance and applicable laws and regulations.

Site Location and Background

The subject property is located at 2139 Adam Clayton Powell Jr. Boulevard (7th Avenue), Harlem, New York. The property is identified more specifically as City of New York Tax Number: Block 1911, Lot 61. The square footage of the property is 9,950 square feet. The rectangular-shaped property is situated on the southeast corner of Adam Clayton Powell, Jr. Boulevard and West 127th Street. The property now contains a 10- story mixed use building to be used as a community facility space for Harlem Dowling’s West Side Center for Children and Family Services as well as 60 affordable residential units. Prior to development the property consisted of vacant asphalt covered land.

Summary of Redevelopment Plan The property now contains a 10-story building with a height of approximately 110 feet and a street wall height of approximately 85 feet. The development required excavation across the entire Site to a depth of approximately 12' below ground surface for the cellar level. The building covers the entire lot and sits above a complete basement which is used for community facility space as well as building facilities (i.e. electric, gas, water, etc.). The approximately 74,448 gross square foot mixed use building will be

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 comprised of community facility space for Harlem Dowling’s West Side Center for Children and Family Services’ administrative offices, program space and social services space. Of the 16,000 square feet of community facility, approximately 9,500 square feet will be located at grade level and the balance to be located below grade. Floors 2 - 10 will provide 60 affordable residential units (approximately 56,295 square feet). Outdoor recreational space is located at the second floor level and will measure approximately 3,200 SF. No landscaped areas are present at the Site. For development purposes, the entire Site was excavated to a depth of 12 feet for the building’s new cellar level. Additional excavation occurred in the along the southern and western boundaries extending 35 feet into the site to a depth of 13 feet for removal of soil exceeding SCOs. Overall, the excavation required the total removal of 7,066.69 tons (9,893.38 cubic yards) of soil from the subject property of which 2,663.68 tons (3,729.15 cubic yards cubic yards) consisted of non-hazardous soil/fill material, 3,602.14 tons (5,042.99 cubic yards) consisted of hazardous soil/fill material and 800.87 tons (1,121.24 cubic yards) of non- regulated soil with high lead.

Summary of Surrounding Property The subject property is bordered on the west by Adam Clayton Powell Jr. Boulevard (7th Avenue) beyond which are apartment buildings with retail uses on the first floor. To the north, the property is bordered by West 127th Street beyond which are apartment buildings with retail uses on the first floor and a charter school. The James Wells District Grand Lodge, Citicare, Inc. Family Health Canter, White Rock Baptist Church and brownstone residential buildings are located to the east of the subject property. A vacant lot that was formerly a retail strip center, Brownstone residential buildings, West 126th Street and Adam Clayton Powell Jr. State Office Building are to the south of the Site. There are three day care centers, one public school, and one health care center within a 500-foot radius of the Site.

Summary of Past Site Uses of Site and Areas of Concern The 9,950 square foot (SF) property prior to construction of the new apartment buildings consisted of vacant, undeveloped lot covered with an asphalt and recycled concrete aggregate (RCA) surface, with a concrete slab present in the western portion of 9

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 the subject property. Based on a review of Sanborn maps the subject property was occupied by three (3) conjoined, five-story residential apartment buildings with ground-floor commercial store fronts from 1902-1989. From 1991 to 1992, the northern two (2) buildings were no longer present and consisted of vacant lots, while the southern apartment building remained. Review of the EDR City Directory Abstract showed commercial businesses in the listings from 1927-1978 including Soul Stop Inc., a music studio, social clubs, beauty salons, a barber shop, a dry cleaners (2137 7th Avenue, 1956-1963), a temple, a realty company and a printing shop. There were no occupant listings for the subject property available prior to 1927 or after 1978.

Summary of the Work Performed under the Remedial Investigation The remedial investigation consisted of the following:

1. Conducted a Site inspection to identify AOCs and physical obstructions (i.e. structures, buildings, etc.); 2. A remote sensing ground penetrating radar field survey was performed over portions of the subject property to identify any anomalies that may correspond to structural remnants, debris or storage tanks. 3. Ten soil samples were collected including 5 shallow soil samples and 5 deep (10-12 feet) soil samples. 4. Two (2) temporary groundwater wells were installed on the subject property and two groundwater samples were collected. 5. Three (3) subsurface soil gas probes were installed at the subject property. Three soil vapor samples and one (1) outdoor ambient air control sample was collected.

Summary of Findings of Remedial Investigation 1. Elevation of the property is approximately 28 feet above mean sea level. 2. Depth to groundwater ranges from 16 to 19 feet at the Site. 3. Groundwater flow is believed to be west to northwest beneath the Site.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 4. The stratigraphy of the site, from the surface down, consists of eight to fourteen feet of fill underlain by native soil consisting of gravelly sands. 5. The GPR survey did not identify any anomalies typical of an underground storage tank or sanitary system on the subject property. 6. Ten soil/fill samples results were compared to NYSDEC Unrestricted Use Soil Cleanup Objectives (UUSCOs) and Restricted Residential Soil Cleanup Objectives (RRSCOs) as presented in 6NYCRR Part 375-6.8 and CP51. Soil/fill samples collected during the RI showed no PCBs in any of the soil samples. One VOC, acetone (68.9 ug/kg), exceeded Unrestricted Use SCOs in one deep soil. Several SVOCs consisting of Polycyclic Aromatic Hydrocarbons (PAHs) including benzo (a)anthracene (max. of 2,960 ug/Kg), benzo(a)pyrene (max. of 3,460 ug/Kg), benzo(b)fluoranthene (max. of 4,820 ug/Kg), indeno(1,2,3-cd)pyrene (max. of 2,630 ug/Kg), and dibenzo(a,h)anthracene (max. of 615 ug/Kg) were found in four shallow samples exceeding Restricted Residential Use SCOs. In addition, benzo(k)flouranthene (max. of 1,570 ug/Kg) and chrysene (max. of 3,850 ug/Kg) also exceeded Unrestricted Use SCOs in three shallow samples. The pesticides 4,4’-DDE (max. of 42.2 ug/Kg), 4,4’-DDD (max of. 323 ug/Kg), 4,4’-DDT (max. of 188 ug/Kg), and chlordane (max. of 83.4) exceeded Unrestricted Use SCOs in both shallow and deep samples but were below Restricted Residential Use SCOs. Several metals including barium (max. of 1,120 mg/Kg), chromium (max. of 44.9 mg/Kg), copper (max of. 109 mg/kg), lead (max. of 2,090 ug/Kg), nickel (max. of 37.6 mg/kg), mercury (max. of 125 ug/Kg) and zinc (max. of 780 ug/Kg) were found exceeding Unrestricted Use SCOs. Of these metals, lead, barium and mercury also exceeded Restricted Residential SCOs. Supplemental investigations revealed concentrations of lead were significantly elevated (maximum 23,000 ppm) in several of the sample locations and at various depths. TCLP analysis indicated hazardous concentrations of lead at various depths.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 7. Two groundwater samples results were compared to New York State 6NYCRR Part 703.5 Class GA groundwater quality standards (GQS). Groundwater samples collected during the investigations showed no SVOCs, VOCs, PCBs, or pesticides in any sample. Several metals were identified exceeding their respective GQS in total groundwater samples, including barium (1.14 mg/L), chromium (max. of 0.22 mg/L), copper (max. of 0.43 mg/L), iron (max. of 41.4 mg/L), lead (max. of 0.275 mg/L), manganese (max. of 3.93 mg/L), and sodium (45.4 mg/L). These groundwater samples were not filtered. 8. Soil vapor results collected during the RI were compared to the compounds listed in Table 3.1 Air Guideline Values Derived by the NYSDOH located in the New York State Department of Health (NYSDOH) Final Guidance for Evaluating Soil Vapor Intrusion dated October 2006. Three soil vapor samples showed moderate levels of petroleum related VOCs in all soil vapor samples with total concentrations (BTEX) ranging from 242 µg/m3 to 314 µg/m3. Of the chlorinated VOCs, only tetrachloroethene (PCE) was detected in all soil vapor samples, ranging from 28 to 34 µg/m3. Concentrations for PCE were slightly above the monitoring level ranges established within the State DOH soil vapor guidance matrix.

Summary of the Remedial Action The remedial action achieved protection of public health and the environment for the intended use of the property. The remedial action achieved all of the remedial action objectives established for the project and addressed applicable standards, criterion, and guidance; was effective in both the short-term and long-term and reduced mobility, toxicity and volume of contaminants; was cost effective and implementable; and used standards methods that are well established in the industry.

A summary of the milestones achieved in the Remedial Action is as follows:] A Pre-Application Meeting was held on November 17, 2014 A Remedial Investigation (RI) was performed in May 2014 and a Supplemental RI was performed in August 2014. A

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 Phase II/RI Report was prepared to evaluate data and information necessary to develop a Remedial Action Work Plan (RAWP). A Site Contact List was established. A RAWP was prepared and released with a Fact Sheet on November 19, 2014 for a 30-day public comment period. The RAWP and Stipulation List dated December 18, 2014 was approved by the New York City Office of Environmental Remediation (OER) on December 18, 2014. A Pre-Construction Meeting was held on December 16, 2014. A Fact Sheet providing notice of the start of the remedial action was issued on December 19, 2014. The remedial action was begun in January, 2015 and completed in March, 2015. 1. The remedial action consisted of the following tasks: Prepared a Community Protection Statement and implemented a Citizen Participation Plan. 2. Performed a Community Air Monitoring Program for particulates and volatile organic carbon compounds. 3. Selected NYSDEC Part 375 Track 2 Soil Cleanup Objectives (SCOs). 4. Mobilized site security and equipment; completed utility mark outs; and marked and staked excavation areas. 5. Performed Waste Characterization Study prior to excavation activities. Twenty- seven of waste characterization soil samples were collected on September 26, 2014. Waste characterization samples were collected at a frequency dictated by disposal facilities. 6. The following excavations were performed: For development purposes, the entire Site was excavated to a depth of 12 feet for the building’s new cellar level. Additional excavation occurred in the along the southern and western boundaries extending 35 feet into the site to a depth of 13 feet for removal of soil exceeding SCOs. Overall, the excavation required the total removal of 7,066.69 tons (9,893.38 cubic yards) of soil from the subject property of which 2,663.68 tons (3,729.15 cubic yards cubic yards) consisted of non-hazardous soil/fill material, 3,602.14 tons (5,042.99 cubic yards) consisted of hazardous soil/fill material and 800.87 tons (1,121.24 cubic yards) of non-regulated soil with high lead.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 7. Excavated 2,663.68 tons of non-hazardous soil/fill and transported to Clean Earth of Philadelphia at 3201 South 61st Street, Philadelphia, Pennsylvania and excavated 3,602.14 tons of hazardous characteristic soil/fill as well as 800.87 tons of non-regulated soil/fill with high lead and transported to Clean Earth of North Jersey at 115 Jocobus Avenue, Kearny, New Jersey. 8. Screened excavated soil/fill during intrusive work for indications of contamination by visual means, odor, and monitoring with a PID. 9. Conducted materials management of excavated materials including temporarily stockpiling and segregating in accordance with defined material types and to prevent co-mingling of contaminated material and non-contaminated materials. 10. Appropriately segregated excavated media onsite prior to disposal. Transported and disposed all soil/fill material at permitted facilities in accordance with all applicable laws and regulations for handling, transporting, and disposing, and the RAWP. 11. Collected and analyzed end-point samples to determine attainment of SCOs. Track 2 Restricted Residential SCO’s were achieved. 12. As part of development, constructed an engineered Composite Cover System consisting of consisting of the 6 inch thick concrete foundation slab underlain by 6-inches of gravel sub-base. The contractor for the cover construction was Mega Contracting. 13. As part of construction, a Vapor Barrier System was installed beneath the concrete slab consists of a Grace Preprufe 300R which is a 46 mil high density polyethylene (HDPE). In addition the south and east foundation walls were lined with a Grace Prepruf 160R which is a 32 mil high density HDPE and the north and west walls of the foundation were3 lined with a Grace Bituthene 4000 which is a 62.5 mil HDPE. The vapor barrier was installed prior to pouring the building’s concrete slab. The contractor for the Vapor Barrier System construction was Mega Contracting. 14. As part of construction, a passive SSDS consists of a network of sub-slab 4” ID Schedule 40 PVC piping connected to a riser pipe (via a vertical suction point

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 pipe penetrating the building slab) that leads to a discharge point located above the roof-line which was fitted with a wind driven turbine. The riser pipe consists of a 4” ID cast iron pipe with fire stops. All sub-slab piping was sealed with plumber’s cement (or similar product) that was applied according to the manufacturer’s specifications. The riser pipe joints consist of cast iron, no-hub couplers in accordance with applicable building code and is located at least ten feet from any air intakes. All piping joints were inspected once the system was installed. Temporary monitoring points were located throughout the building slab and testing was done to confirm adequate vacuum and system connectivity. 15. Performed all activities required for the Remedial Action, including permitting requirements and pretreatment requirements, in compliance with applicable laws and regulations. 16. Implemented storm-water pollution prevention measures in compliance with applicable laws and regulations. 17. Submitted a Sustainability Report. 18. Submitted an RAR that describes the Remedial Action; certifies that the remedial requirements defined in the RAWP have been achieved; defines the Site boundaries; and lists any changes from the RAWP.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 REMEDIAL ACTION REPORT 1.0 SITE BACKGROUND Alembic Community Development Company, LLC has enrolled in the New York City Voluntary Cleanup Program (NYC VCP) to investigate and remediate a property located at 2139 Adam Clayton Powel, Jr. Boulevard in Harlem section of Manhattan, New York. The boundary of the property subject to this Remedial Action is shown in Figure 1 and include, in their entirety, Manhattan Block 1911 and Lot 61. The Remedial Action was performed pursuant to the OER-approved RAWP in a manner that has rendered the property protective of public health and the environment consistent with its intended use. This RAR describes the remedial action performed under the RAWP. The remedial action described in this document provides for the protection of public health and the environment, complies with applicable environmental standards, criteria and guidance and applicable laws and regulations.

1.1 SITE LOCATION AND BACKGROUND The subject property is located at 2139 Adam Clayton Powell Jr. Boulevard (7th Avenue), Harlem, New York. The property is identified more specifically as City of New York Tax Number: Block 1911, Lot 61. The rectangular-shaped property is situated on the southeast corner of Adam Clayton Powell, Jr. Boulevard and West 127th Street. The 9,950square foot (SF) property formerly consisted of a vacant, undeveloped lot covered with an asphalt and recycled concrete aggregate (RCA) surface, with a concrete slab present in the western portion of the subject property. The property now contains a 10-story mixed use building to be used as a community facility space for Harlem Dowling’s West Side Center for Children and Family Services as well as 60 affordable residential units.

Figure 2 provide a location map for the subject property.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 1.2 REDEVELOPMENT PLAN The Site now contains a 10-story building with a height of approximately 110 feet and a street wall height of approximately 85 feet. The development required excavation across the entire Site to a depth of approximately 12' below ground surface for the cellar level. The building covers the entire lot and sits above a complete basement which is used for community facility space as well as building facilities (i.e. electric, gas, water, etc.).The approximately 74,448 gross square foot mixed use building will be comprised of community facility space for Harlem Dowling’s West Side Center for Children and Family Services’ administrative offices, program space and social services space. Of the 16,000 square feet of community facility, approximately 9,500 square feet will be located at grade level and the balance to be located below grade. Floors 2 - 10 will provide 60 affordable residential units (approximately 56,295 square feet). Outdoor recreational space is located at the second floor level and will measure approximately 3,200 SF. No landscaped areas are present at the Site. Figure 3 provides a Site Plan of the site development.

1.3 DESCRIPTION OF SURROUNDING PROPERTY

The subject property is bordered on the west by Adam Clayton Powell Jr. Boulevard (7th Avenue) beyond which are apartment buildings with retail uses on the first floor. To the north, the property is bordered by West 127th Street beyond which are apartment buildings with retail uses on the first floor and a charter school. The James Wells District Grand Lodge, Citicare, Inc. Family Health Canter, White Rock Baptist Church and brownstone residential buildings are located to the east of the subject property. A vacant lot that was formerly a retail strip center, Brownstone residential buildings, West 126th Street and Adam Clayton Powell Jr. State Office Building are to the south of the Site. There are three day care centers, one public school, and one health care center within a 500-foot radius of the Site.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 1.4 SUMMARY OF PAST SITE USES AND AREAS OF CONCERN

Nelson, Pope & Voorhis, LLC conducted a Phase I Environmental Site Assessment (ESA) of the property at 2139 Adam Clayton Powell Jr. Boulevard in April 2014. Based on a review of Sanborn maps the subject property was occupied by three (3) conjoined, five-story residential apartment buildings with ground-floor commercial store fronts from 1902-1989. From 1991 to 1992, the northern two (2) buildings were no longer present and consisted of vacant lots, while the southern apartment building remained. Review of the EDR City Directory Abstract showed commercial businesses in the listings from 1927-1978 including Soul Stop Inc., a music studio, social clubs, beauty salons, a barber shop, a dry cleaners (2137 7th Avenue, 1956-1963), a temple, a realty company and a printing shop. There were no occupant listings for the subject property available prior to 1927 or after 1978. Several RCRA hazardous waste generators were also found to be in close proximity of the Site.

Based on the findings of the Phase I ESA, the following two (2) recognized environmental conditions were identified in connection with the subject property:

1. Presence of historic fill and occurrence of sink holes on the subject property.

2. Past occupancy of a dry cleaners on the subject property.

1.5 SUMMARY OF WORK PERFORMED UNDER THE REMEDIAL INVESTIGATION

Nelson, Pope & Voorhis, LLC performed the following scope of work in May of 2014:

1. Conducted a Site inspection to identify AOCs and physical obstructions (i.e. structures, buildings, etc.);

2. Installed five soil borings across the entire project Site, and collected ten soil samples for chemical analysis from the soil borings to evaluate soil quality;

3. Installed two temporary groundwater monitoring wells throughout the Site and collected two groundwater samples;

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 4. Installed three soil vapor probes and collected three samples and one outdoor ambient air sample for chemical analysis.

1.6 SUMMARY OF FINDINGS OF REMEDIAL INVESTIGATION

1. Elevation of the property is approximately 28 feet above mean sea level.

2. Depth to groundwater ranges from 16 to 19 feet at the Site.

3. Groundwater flow is believed to be west to northwest beneath the Site.

4. The stratigraphy of the site, from the surface down, consists of eight to fourteen feet of fill underlain by native soil consisting of gravelly sands.

5. The GPR survey did not identify any anomalies typical of an underground storage tank or sanitary system on the subject property.

6. Ten soil/fill samples results were compared to NYSDEC Unrestricted Use Soil Cleanup Objectives (UUSCOs) and Restricted Residential Soil Cleanup Objectives (RRSCOs) as presented in 6NYCRR Part 375-6.8 and CP51. Soil/fill samples collected during the RI showed no PCBs in any of the soil samples. One VOC, acetone (68.9 ug/kg), exceeded Unrestricted Use SCOs in one deep soil. Several SVOCs consisting of Polycyclic Aromatic Hydrocarbons (PAHs) including benzo (a)anthracene (max. of 2,960 ug/Kg), benzo(a)pyrene (max. of 3,460 ug/Kg), benzo(b)fluoranthene (max. of 4,820 ug/Kg), indeno(1,2,3- cd)pyrene (max. of 2,630 ug/Kg), and dibenzo(a,h)anthracene (max. of 615 ug/Kg) were found in four shallow samples exceeding Restricted Residential Use SCOs. In addition, benzo(k)flouranthene (max. of 1,570 ug/Kg) and chrysene (max. of 3,850 ug/Kg) also exceeded Unrestricted Use SCOs in three shallow samples. The pesticides 4,4’-DDE (max. of 42.2 ug/Kg), 4,4’-DDD (max of. 323 ug/Kg), 4,4’-DDT (max. of 188 ug/Kg), and chlordane (max. of 83.4) exceeded Unrestricted Use SCOs in both shallow and deep samples but were below Restricted Residential Use SCOs. Several metals including barium (max. of 1,120 mg/Kg), chromium (max. of 44.9 mg/Kg), copper (max of. 109 mg/kg), lead 19

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 (max. of 2,090 ug/Kg), nickel (max. of 37.6 mg/kg), mercury (max. of 125 ug/Kg) and zinc (max. of 780 ug/Kg) were found exceeding Unrestricted Use SCOs. Of these metals, lead, barium and mercury also exceeded Restricted Residential SCOs. Supplemental investigations revealed concentrations of lead were significantly elevated (maximum 23,000 ppm) in several of the sample locations and at various depths. TCLP analysis indicated hazardous concentrations of lead at various depths.

7. Two groundwater samples results were compared to New York State 6NYCRR Part 703.5 Class GA groundwater quality standards (GQS). Groundwater samples collected during the investigations showed no SVOCs, VOCs, PCBs, or pesticides in any sample. Several metals were identified exceeding their respective GQS in total groundwater samples, including barium (1.14 mg/L), chromium (max. of 0.22 mg/L), copper (max. of 0.43 mg/L), iron (max. of 41.4 mg/L), lead (max. of 0.275 mg/L), manganese (max. of 3.93 mg/L), and sodium (45.4 mg/L). These groundwater samples were not filtered.

8. Soil vapor results collected during the RI were compared to the compounds listed in Table 3.1 Air Guideline Values Derived by the NYSDOH located in the New York State Department of Health (NYSDOH) Final Guidance for Evaluating Soil Vapor Intrusion dated October 2006. Three soil vapor samples showed moderate levels of petroleum related VOCs in all soil vapor samples with total concentrations (BTEX) ranged from 242 µg/m3 to 314 µg/m3. Of the chlorinated VOCs, only tetrachloroethene (PCE) was detected in all soil vapor samples, ranging from 28 to 34 µg/m3. Concentrations for PCE were above the monitoring level ranges established within the State DOH soil vapor guidance matrix.

For more detailed results, consult the Phase II report found in Appendix 1.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 2.0 DESCRIPTION OF REMEDIAL ACTIONS

The remedial action was performed in accordance with an OER approved Remedial Action Work Plan (Appendix 2) and achieved the remedial action objectives established for the project. The remedial action was evaluated in an alternatives analysis and was determined to be protective of human health and the environment, compliant with standards, criteria, and guidelines (SCGs), effective in the short-term, effective in the long-term, capable of attaining appropriate levels of reduction of toxicity, mobility, or volume of contaminated material, implementable, cost effective, acceptable to the community, consistent with land uses, and sustainable. A summary of the milestones achieved in the Remedial Action is as follows: A Pre-Application Meeting was held on November 17, 2014. A Remedial Investigation (RI) was performed in May 2014 and a Supplemental RI was performed in August 2014. A Phase II/RI Report was prepared to evaluate data and information necessary to develop a Remedial Action Work Plan (RAWP). A Site Contact List was established. A RAWP was prepared and released with a Fact Sheet on November 19, 2014 for a 30-day public comment period. The RAWP and Stipulation List dated November 17, 2014 was approved by the New York City Office of Environmental Remediation (OER) on December 19, 2014. A Pre-Construction meeting was held on December 18, 2014. A Fact Sheet providing notice of the start of the remedial action was issued on December 19, 2014. The remedial action was begun on January, 2015 and completed on March, 2015. The remedial action consisted of the following tasks: 1. Prepared a Community Protection Statement and implemented a Citizen Participation Plan. 2. Performed a Community Air Monitoring Program for particulates and volatile organic carbon compounds. 3. Selected NYSDEC Part 375 Track 2 Soil Cleanup Objectives (SCOs). 4. Mobilized site security and equipment; completed utility mark outs; and marked and staked excavation areas.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 5. Performed Waste Characterization Study prior to excavation activities. Eighteen waste characterization soil samples were collected on September 26, 2014. Waste characterization samples were collected at a frequency dictated by disposal facility(s). 6. The following excavations were performed: For development purposes, the entire Site was excavated to a depth of 12 feet for the building’s new cellar level. Additional excavation occurred in the along the southern and western boundaries extending 35 feet into the site to a depth of 13 feet for removal of soil exceeding SCOs. A total of 7,066.69 tons of soil/fill was excavated and removed from the property. 7. Excavated 2,663.68 tons of non-hazardous soil/fill and transported to Clean Earth of Philadelphia at 3201 South 61st Street, Philadelphia, Pennsylvania and excavated 3,602.14 tons of hazardous characteristic soil/fill as well as 800.87 tons of non-regulated fill/soil and transported to Clean Earth of North Jersey at 115 Jocobus Avenue, Kearny, New Jersey 8. Screened excavated soil/fill during intrusive work for indications of contamination by visual means, odor, and monitoring with a PID. 9. Conducted materials management of excavated materials including temporarily stockpiling and segregating in accordance with defined material types and to prevent co-mingling of contaminated material and non-contaminated materials. 10. Appropriately segregated excavated media onsite prior to disposal. Transported and disposed all soil/fill material at permitted facilities in accordance with all applicable laws and regulations for handling, transporting, and disposing, and the RAWP. 11. Collected and analyzed end-point samples to determine attainment of SCOs. Track 2 Restricted Residential SCO’s were achieved. 12. As part of development, constructed an engineered Composite Cover System consisting of consisting of the 6 inch thick concrete foundation slab underlain by 6-inches of gravel sub-base. The contractor for the cover construction was Mega Contracting.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 13. As part of construction, a Vapor Barrier System was installed beneath the concrete slab consists of a Grace Preprufe 300R which is a 46 mil high density polyethylene (HDPE). In addition the south and east foundation walls were lined with a Grace Prepruf 160R which is a 32 mil high density HDPE and the north and west walls of the foundation were lined with a Grace Bituthene 4000 which is a 62.5 mil HDPE. The vapor barrier was installed prior to pouring the building’s concrete slab. The contractor for the Vapor Barrier System construction was Mega Contracting. 14. As part of construction, installed and operated a passive Sub-Slab Depressurization System utilizing fabric wrapped schedule 4-inch 40 perforated PVC pipes aligned horizontally beneath the building slab and attached to a common lateral and then vertical pipes that traverse the building slab, with vapors conveyed via a chase and vented above the roof of the building. The contractor for the Passive Sub-Slab Depressurization System construction was Mega Contracting. 15. Performed all activities required for the Remedial Action, including permitting requirements and pretreatment requirements, in compliance with applicable laws and regulations. 16. Implemented storm-water pollution prevention measures in compliance with applicable laws and regulations. 17. Submitted a Sustainability Report. 18. Submitted an RAR that describes the Remedial Action; certifies that the remedial requirements defined in the RAWP have been achieved; defines the Site boundaries; and lists any changes from the RAWP.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 3.0 COMPLIANCE WITH REMEDIAL ACTION WORK PLAN

3.1 HEALTH & SAFETY PLAN The remedial construction activities performed under this program were in compliance with the Health and Safety Plan and applicable laws and regulations. The Site Safety Coordinator was Steven J. McGinn.

3.2 COMMUNITY AIR MONITORING PLAN The Community Air Monitoring Plan provided for the collection and analysis of air samples during remedial construction activities to ensure proper protections were employed to protect workers and the neighboring community. Monitoring was performed from January 7, 2015 to March 12, 2015 in compliance with the Community Air Monitoring Plan in the approved RAWP. The results of Community Air monitoring are shown in Appendix 3.

3.3 SOIL/MATERIALS MANAGEMENT PLAN The Soil/Materials Management Plan provided detailed plans for managing all soil/materials that were disturbed at the Site, including excavation, handling, storage, transport and disposal. It also included a series of controls to assure effective, nuisance free remedial activity in compliance with applicable laws and regulations. Remedial construction activities performed under this program were in compliance with the SMMP in the approved RAWP.

3.4 STORM-WATER POLLUTION PREVENTION Storm water pollution prevention included physical methods and processes to control and/or divert surface water flows and to limit the potential for erosion and migration of Site soils, via wind or water. Remedial construction activities performed under this program were in full compliance with methods and processes defined in the RAWP for storm water prevention and applicable laws and regulations. 24

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

3.5 DEVIATIONS FROM THE REMEDIAL ACTION WORK PLAN The RAWP called for the installation of a Grace Prepruf 300R or a Grace Preprufe 200R vapor barrier. A Grace Prepruf 300R vapor barrier was installed beneath the concrete slab foundation but the sidewalls were covered with a Grace Prepruf 160R which is a 32 mil high density HDPE and a Grace Bituthene 4000 which is a 62.5 mil HDPE. Both of these vapor barriers still comply with the minimum 20 mil limitation for vapor barriers required by OER.

There were no other deviations from the remedial action work plan.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 4.0 REMEDIAL PROGRAM

4.1 PROJECT ORGANIZATION Principal personnel who participated in the remedial action include Michael McCarthy, Alembic Development Corp. and Boris Medovoy, Mega Contracting Project Manager. The Professional Engineer (PE) and Qualified Environmental Professionals (QEP) for this project were Thomas F. Lembo, P.E. and Steven J. McGinn.

4.2 SITE CONTROLS Site Preparation

OER was invited to attend the pre-construction meeting at the Site with all parties involved in the remedial process prior at the start of remedial construction activities.

Mobilization was conducted as necessary for each phase of work at the Site. Mobilization included field personnel orientation, equipment mobilization (including securing all sampling equipment needed for the field investigation)and utility mark-outs. Each field team member attended an orientation meeting to become familiar with the general operation of the Site, health and safety requirements, and field procedures.

The presence of utilities and easements on the Site were fully investigated prior to the performance of excavation activities conducted under this plan by using the One-Call System (811). All invasive activities were performed in compliance with applicable laws and regulations to assure safety. Proper safety and protective measures pertaining to utilities and easements, and compliance with all laws and regulations were employed during invasive and other work.

The subject property was vacant and did not contain any structures prior to the commencement of development. Some remnants of a concrete pad and scattered debris was collected and placed in a roll of dumpster for disposal as non-hazardous waste at an appropriate facility.

An OER Project Notice was erected at the project entrance and was in place during

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 all phases of the Remedial Action.

Soil Screening Visual, olfactory and PID soil screening and assessment was performed under the supervision of a Qualified Environmental Professional. Soil screening was performed during invasive work performed during the remedy and development phases. No significant observations were noted or meter reading recorded that would indicate the presence of significant contamination or release.

Stockpile Management Excavated soil from suspected areas of contamination was loaded directly onto trucks for transport to the appropriate disposal facility. No soil was stockpile on the site at any time.

Truck Inspection

Steps were taken to ensure that trucks departing the site will not track soil, fill or debris off-Site. Such actions included the use of stone aggregate-based egress paths between the truck inspection station and the property exit. Measures were taken to ensure that adjacent roadways were be kept clean of project related soils, fill and debris.

An outbound-truck inspection station was set up close to the Site exit. Before exiting the NYC VCP Site, trucks were required to stop at the truck inspection station and were examined for evidence of contaminated soil on the undercarriage, body, and wheels. Soil and debris were removed. Brooms, shovels and potable water were utilized for the removal of soil from vehicles and equipment, as necessary. No soil was reported to have been tracked off-site.

Site Security Site access was controlled by gated entrances to the property which was surrounded by a chain link fence.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 Nuisance Controls All necessary means were employed to prevent on- and off-Site odor nuisances. At a minimum, procedures included: (a) limiting the area of open excavations; (b) shrouding open excavations with tarps and other covers; and (c) use of foams to cover exposed odorous soils. If odors developed and could not otherwise be controlled, additional means to eliminate odor nuisances included: (d) direct load-out of soils to trucks for off-Site disposal; and (e) use of chemical odorants in spray or misting systems. The odor control plan outlined in the Soils/Materials Management Plan was capable of controlling emissions of nuisance odors. If nuisance odors were identified, work was halted and the source of odors was identified and corrected. Work did not resume until all nuisance odors have been abated. No nuisance odors were reported during implementation of the remedial action plan. Dust management during invasive on-Site work included, at a minimum: • Use of a dedicated water spray methodology for roads, excavation areas and stockpiles. • Use of properly anchored tarps to cover stockpiles. • Exercise extra care during dry and high-wind periods. • Use of gravel or recycled concrete aggregate on egress and other roadways to provide a clean and dust-free road surface. The dust control plan outlined in the Soils/Materials Management Plan was capable of controlling emissions of dust. If nuisance dust emissions awere identified, work was be halted and the source of dusts identified and corrected. Work was not resume until all nuisance dust emissions have been abated. No dust issues were reported during the implementation of the remedial action plan. Noise control was exercised during the remedial program. All remedial work conformed, at a minimum, to NYC noise control standards. A rodent control plan was not implemented during the construction of the proposed project since a rodent issue was not present during development.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 Reporting Daily reports providing a general summary of activities for each day of active remedial work were emailed to the OER Project Manager by the end of the following day. Those reports included: • Project number and statement of the activities and an update of progress made and locations of work performed; • Quantities of material imported and exported from the Site; • Status of on-Site soil/fill stockpiles; • A summary of all citizen complaints, with relevant details (basis of complaint; actions taken; etc.); • A summary of CAMP excursions, if any; • Photograph of notable Site conditions and activities. Job-site record keeping for all remedial work were also performed. These records were maintained on-Site during the project and were available for inspection by OER staff. Representative photographs were taken of the Site prior to any remedial activities and during major remedial activities to illustrate remedial program elements and contaminant source areas. All daily reports are included in Appendix 4. Digital photographs of the Remedial Action are included in Appendix 4.

4.3 MATERIALS EXCAVATION AND REMOVAL Remediation activities consisted of the excavation of soil/fill required for the construction of the new building's cellar level (an area that encompassed the entire property) and was advanced to a depth of approximately 12 feet below grade. Soils were excavated until Track 2 SCOs consisting of the 6NYCRR Part 375, Table 6.8(b) Restricted Residential Use SCOs were achieved. Hazardous levels of lead were encountered at various depths throughout the property and further sampling was conducted to delineate the extent of hazardous and non-hazardous soil/fill. To accomplish this, the site was divided into a grid consisting of nine quadrants within which hazardous material was detected in six. Further delineation activities were then

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 conducted to establish the extent of soil/fill which would required to be removed as hazardous material. Results of the delineation revealed that hazardous soil/fill containing lead were encountered in the northern and southern corners of the property as well as the center of the property running from northeast to southwest. A report detailing the results of delineation activities is provided in Appendix 5.

Review of the analytical results for the initial endpoint samples collected at twelve feet bgs found numerous constituents which exceeded their respective Track 2 Restricted Residential SCOs including elevated levels of several semi-volatile organic compounds and metals in endpoint samples collected from Grids 3, 6, 8 and 9. Following further excavation of soils within these grids down to a depth of 13 feet below grade.

Overall, the excavation required the total removal of 7,066.69 tons (9,893.36 cubic yards) of soil from the subject property of which 2,663.68 tons (3,729.15 cubic yards cubic yards) consisted of non-hazardous soil/fill material, 3,602.14 tons (5,042.99 cubic yards) consisted of hazardous soil/fill material and 800.87 tons (1,121.21 cubic yards) of unregulated soil with high lead. A map showing the location where excavations were performed is shown in Figures 5-1 through 5-4.

Soil Cleanup Objectives The SCOs for this Remedial Action are Track 2 Restricted Residential SCOs consisting of the 6NYCRR Part 375, Table 6.8(b).

End Point Sample Results A total of nine endpoint samples were collected from the excavation and analyzed for the following:

• Volatile organic compounds by EPA Method 8260; • Semi-volatile organic compounds by EPA Method 8270; • Target Analyte List metals; and 30

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 • Pesticides/PCBs by EPA Method 8081/8082. All results were compared to the Track 2 RR SCO’s. Review of the analytical results for the initial endpoint samples (Table 1) found numerous constituents which exceeded their respective Track 2 Restricted Residential SCOs including elevated levels of several semi-volatile organic compounds and metals in endpoint samples collected from Grids 3, 6, 8 and 9. Following further excavation of soils within these grids down to a depth of 13 feet below grade end point samples were collected and sampled for semi-volatile organic compounds and metals. Review of the results (Table 2) found that all analyzed constituents were below their respective SCO’s except for the detection of one analyte, Indeno(1,2,3-cd)pyrene at 603 ppm and marginally above its Track 2 Restricted Residential SCO of 500 ppm, in the sample collected from Grid 8. This result is within the 20% factor of error for the analytical method. Further, the overlying endpoint in Grid 8 did not exceed the SCO for this analyte and groundwater does not exhibit exceedence of Groundwater Quality Standards for this compound. Overall, remedial action of this property has achieved Track 2 Restricted Residential SCOs.

A map of end-point sample locations is shown in Figure 5. A tabular summary of end-point sampling results compared to SCO’s is included in Tables 1 & 2. Laboratory analytical datasheets for endpoint samples are provided in Appendix 6.

4.4 MATERIALS DISPOSAL Waste characterization sampling was conducted by Nelson, Pope & Voorhis on September 26, 2014 and the results are summarized in a letter to Clean Earth which is provided in Appendix 7. Letters of approval were received from Clean Earth on October 23, 2014. Copies of these correspondences are provided in Appendix 8. All soil material excavated from the site was shipped to Clean Earth facilities between January 7, 2015 to March 12, 2015. The material type, quantity and disposal location of material removed and disposed off-Site is presented Table 3. Clean Earth analytical data and acceptance letters from disposal facility stating it is

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 approved to accept above materials are attached in Appendix 8. Truck log tables, manifests and individual truck transport information (including individual trucking information) are included in Appendix 9. Waste Characterization sample results is presented in Table 4.

4.5 BACKFILL IMPORT 230 CY of backfill utilized to fill underneath and around the basement foundation. The backfill was acquired from native soil collected a depth of 18 to 22 feet below ground surface from a separate site located at 31-53 31st Street in Queens New York. The site from which backfill was acquired had historically been used for residential purposes or consisted of vacant land. Prior to import the five samples collected from the soils were analyzed for volatile organic compounds, semi-volatile organic compounds, TAL metals, hexovalent chromium, pesticides, herbicides, PCBs, RCRA Characteristics and TPH. Results of the analysis revealed that no volatile organic compounds, semi- volatile organic compounds, pesticides, herbicides, or PCBs were detect in any of the samples analyze. Several metals were detected in each of the samples but all were below their respective Part 360 recommended soil cleanup objectives. A summary of the backfill analytical results are provided in Table 5. The laboratory analytical datasheets for the backfill results are provided in Appendix 10.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

5.0 ENGINEERING CONTROLS A Track 2 Restricted Residential Remedial Action was achieved and Engineering Controls are not required. However, three protective environmental systems were built at part of construction. These are:

• Composite cover system consisting the 6-inch thick concrete building slab; • Vapor Barrier system; and

• Passive Sub-Slab Depressurization System

Composite Cover System

As part of construction, an engineered, composite cover system was built on the Site. This composite cover system is comprised of the 6-inch thick concrete building slab over 6-inch layer of gravel sub-base and sidewalls of the proposed building. The location of the composite cover system is depicted in Figure 3. Appendix 11 includes the location of each cover type at the Site. Photographs of construction of the Composite Cover System are included in Appendix 11. The contractor for the Composite Cover System construction was Mega Contracting.

Vapor Barrier System

As part of construction, a Vapor Barrier System was installed beneath the concrete slab consists of a Grace Preprufe 300R which is a 46 mil high density polyethylene (HDPE). In addition the south and east foundation walls were lined with a Grace Prepruf 160R which is a 32 mil high density HDPE and the north and west walls of the foundation were lined with a Grace Bituthene 4000 which is a 62.5 mil HDPE. The vapor barrier was installed prior to pouring the building’s concrete slab. The contractor for the Vapor Barrier System construction was Mega Contracting. A description of the installation procedures utilized are provided within the material specification sheets

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 included in Appendix11. The location of the vapor barrier which is underneath the entire building footprint is depicted in Figure 6.

The manufacturer specification for the vapor barrier is included in Appendix 11.

The project's Professional Engineer licensed by the State of New York had primary direct responsibility for overseeing the implementation of the vapor barrier. The PE is .

Passive Sub-Slab Depressurization System

Migration of potential future soil vapor from offsite is mitigated with the construction of a passive sub-slab depressurization system (SSDS).

The passive SSDS consists of a network of sub-slab 4” ID Schedule 40 PVC piping connected to a riser pipe (via a vertical suction point pipe penetrating the building slab) that leads to a discharge point located above the roof-line which was fitted with a wind driven turbine. The riser pipe consists of a 4” ID cast iron pipe with fire stops.All sub-slab piping was sealed with plumber’s cement (or similar product) that was applied according to the manufacturer’s specifications. The riser pipe joints consist of cast iron, no-hub couplers in accordance with applicable building code and is located at least ten feet from any air intakes. All piping joints were inspected once the system was installed. Temporary monitoring points were located throughout the building slab and testing was done to confirm adequate vacuum and system connectivity. The layout of the passive SSDS is depicted in Figure 7. Detailed information regarding this SSDS system is contained in Appendix 11. The approving engineer for the passive SSDS was Thomas J. Lembo. The contractor for the passive SSDS construction was Mega Contracting.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 6.0 INSTITUTIONAL CONTROLS

A Track 2 Remedial Action was achieved in the Remedial Action and Institutional Controls are not required.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

7.0 SITE MANAGEMENT PLAN A Track 2 Remedial Action was achieved and Site Management is not required.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017 8.0 SUSTAINABILITY REPORT This Remedial Action Work Plan provides for sustainable remediation and redevelopment through a variety of means that are defined in this Sustainability Report.

Recontamination Control. Recontamination after cleanup and redevelopment is completed undermines the value of work performed, may result in a property that is less protective of public health or the environment, and may necessitate additional cleanup work later that could impede future redevelopment. Recontamination can arise from future releases that occur within the property or by influx of existing contamination from off-Site. The area of the Site that utilizes recontamination controls under this plan is under the entire building footprint of the entire site, which is 9,950 square feet.

Paperless Brownfield Cleanup Program. Alembic Community Development Company, LLC participated in OER’s Paperless Brownfield Cleanup Program. Under this program, submission of electronic documents replaced submission of hard copies for the review of project documents, communications and milestone reports. A best estimate of the mass (pounds) of paper saved under this plan is 10 pounds.

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

TABLES

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

TABLE 1 FIRST ROUND BUILDING EXCAVATION END POINT SAMPLE ANALYTICAL RESULTS

Constituents Grid 1 EP Grid 2 EP Grid 3 EP Grid 4 EP Grid 5 EP Grid 6 EP Grid 7 EP Grid 8 EP Grid 9 EP 6 NYCRR Part 375 Unrestricted Use 6 NYCRR Part 375 Residential 6 NYCRR Part 375 Restricted Residential Volatiles ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg Acetone ND ND 56.1 ND ND ND NA ND ND 50 100,000 100,000 Methylene Chloride ND ND 10.8 5.82 8.53 ND NA ND ND 50 51,000 100,000 Benzene ND ND 7.64 ND ND ND NA ND ND 60 2,900 4,800 Toluene ND ND 10.4 ND ND ND NA ND ND 700 100,000 100,000 Semi-Volatiles ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg 1,4-Dichlorobenzene ND 82.2 ND ND ND ND ND 128 ND NS NS NS Naphthalene ND ND ND ND ND 61.4 ND ND ND 12,000 100,000 100,000 Dimethyl phthalate ND ND ND 420 ND ND ND ND ND NS NS NS Acenaphthylene ND ND ND ND ND 93.3 ND ND 94.2 100,000 100,000 100,000 Acenaphthene ND ND ND ND ND 62.2 ND ND ND 20,000 100,000 100,000 Dibenzofuran ND ND ND ND ND 54.4 ND ND ND NS NS NS Flourene ND ND ND ND ND 87.9 ND ND ND 30,000 100,000 100,000 Phenanthrene ND 64 274 106 380 1,040 ND 166 569 100,000 100,000 100,000 Anthracene ND ND 82.5 ND ND 246 ND 52.7 146 100,000 100,000 100,000 Carbazole ND ND ND ND ND 93.3 ND ND ND NS NS NS Di-n-butyl phthalate ND ND ND ND ND 277 ND 75 ND NS NS NS Flouranthene ND 142 619 ND 685 1,890 ND 347 1,090 100,000 100,000 100,000 Pyrene ND 125 594 209 660 1,840 ND 330 940 100,000 100,000 100,000 Benzo(a)athracene ND 80.1 370 139 387 971 ND 212 633 1,000 1,000 1,000 Chrysene ND 77.1 410 138 470 980 ND 252 642 1,000 1,000 3,900 Bis(2-Ethylhexyl)phthalate ND ND ND ND ND 152 ND 57.2 181 NS NS NS Benzo(b)flouranthene ND 101 570 178 578 1,290 ND 394 985 1,000 1,000 1,000 Benzo(k)flouranthene ND 52.4 164 68.6 215 510 ND 114 375 800 1,000 3,900 Benzo(a)pyrene ND 73.5 399 119 373 865 ND 267 684 1,000 1,000 1,000 Indeno(1,2,3-cd)pyrene ND 66.2 299 122 326 771 ND 285 591 500 500 500 Dibenzo(a,h)anthracene ND ND 57.5 ND ND 145 ND 45.3 106 330 330 330 Benzo(g,h,i)perylene ND 63.3 279 117 409 679 ND 258 545 100,000 100,000 100,000 Metals mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg Aluminum 2,300 3,950 4,920 2,770 1,660 5,040 2,370 3,850 5,150 NS NS NS Arsenic ND 3.13 2.56 ND ND 6.01 ND ND ND 13 16 16 Barium 25.2 63.2 196 73.3 45.5 291 17.4 171 195 350 350 400 Calcium 779 2,530 10,200 5,160 2,620 19,700 759 4,940 12,900 NS NS NS Chromium 6.18 12.2 11.2 7.82 4.86 11.3 5.56 9.89 11.7 30 36 180 Cobalt 2.72 4.74 6.32 3.19 1.92 4.23 2.5 2.83 4.66 NS NS NS Copper 8.40 141 43.5 17.8 23.1 150 6.95 53.1 39.0 50 270 270 Iron 4,840 8,480 8,530 5,860 4,660 9,270 4,920 6.040 12,800 NS NS NS Lead 2.98 135 322 87.1 66.4 571 3.52 199 461 63 400 400 Magnesium 1,240 2.030 3,210 2,140 759 3,180 1,200 1,730 2,890 NS NS NS Manganese 232 999 488 200 96.8 273 218 83.1 217 1,600 2,000 2,000 Nickel 6.59 15.5 18.8 6.94 4.08 11.2 7.68 8.45 11.3 30 140 310 Potassium 450 716 939 651 337 1,120 462 717 1,050 NS NS NS Sodium 42.7 125 254 84.2 71.4 486 57.5 242 342 NS NS NS Thalium ND ND ND ND ND ND ND 1.78 NS NS NS Vandium 8.13 33.2 24.3 13.5 7.42 17.5 8.37 13.9 19.2 NS NS NS Zinc 9.86 218 163 58.4 49.7 252 32.5 219 164 109 2,200 10,000 Mercury ND 0.29 1.17 0.25 0.22 1.10 ND 2.81 2.07 0.18 0.81 0.81

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

TABLE 1 Con’t FIRST ROUND BUILDING EXCAVATION END POINT SAMPLE ANALYTICAL RESULTS

6 NYCRR Part 375 6 NYCRR Part 375 6 NYCRR Part 375 Constituents Grid 1 EP Grid 2 EP Grid 3 EP Grid 4 EP Grid 5 EP Grid 6 EP Grid 7 EP Grid 8 EP Grid 9 EP Unrestricted Use Residential Restricted Residential Pesticides ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg trans-Chlordane ND ND ND ND ND 11.0 NA 9.78 9.61 NS NS NS cis-Chlordane ND ND ND ND ND 11.1 NA 9.93 11.6 NS NS NS DDE ND ND 27.5 54.1 ND 38.4 NA 21.4 14.7 3.3 1,800 8,900 Dieldrin ND ND ND ND 7.72 NA 5 39 200 DDD ND ND 13.5 10.9 ND 20.1 NA 17 13.9 3.3 2,600 13,000 DDT ND 22.6 120 181 21.9 222 NA 138 133 3.3 1,700 7,900 Chlordane ND ND 34.7 22.4 ND 71.9 NA 56.8 53.4 94 1,700 7,900 Notes: Only detected compounds reported in table. Compounds not listed were not detected in any of the samples collected. ND – Non-detect; NS – No SCO established for compound. Shaded and Bold indicates compound exceeded its Part 375 SCO for Restricted Residential Use Shaded and Italic indicates compound exceeded its Part 375 SCO for Unrestricted Use Shaded and Underlined indicates compound exceeded its Part 375 SCO for Residential Use

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

TABLE 2 SECOND ROUND BUILDING EXCAVATION END POINT SAMPLE ANALYTICAL RESULTS

Constituents Grid 3 EP Grid 6 EP Grid 8 EP Grid 9 EP 6 NYCRR Part 375 Unrestricted Use 6 NYCRR Part 375 Residential 6 NYCRR Part 375 Restricted Residential Semi-Volatiles ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg 1,4-Dichlorobenzene ND ND ND ND NS NS NS Naphthalene ND ND ND ND 12,000 100,000 100,000 Dimethyl phthalate ND ND ND ND NS NS NS Acenaphthylene ND ND ND ND 100,000 100,000 100,000 Acenaphthene ND ND ND ND 20,000 100,000 100,000 Dibenzofuran ND ND ND ND NS NS NS Flourene ND ND ND ND 30,000 100,000 100,000 Phenanthrene 54.6 ND 337 ND 100,000 100,000 100,000 Anthracene 82.5 ND ND ND 100,000 100,000 100,000 Carbazole ND ND ND ND NS NS NS Di-n-butyl phthalate ND ND ND ND NS NS NS Flouranthene 170 ND 842 ND 100,000 100,000 100,000 Pyrene 149 ND ND ND 100,000 100,000 100,000 Butyl benzyl phthalate 818 ND ND ND NS NS NS Benzo(a)athracene 118 ND 647 ND 1,000 1,000 1,000 Chrysene 131 ND 716 ND 1,000 1,000 3,900 Bis(2-Ethylhexyl)phthalate ND ND 155 96.6 NS NS NS Benzo(b)flouranthene 220 ND 962 ND 1,000 1,000 1,000 Benzo(k)flouranthene 58.9 ND 291 ND 800 1,000 3,900 Benzo(a)pyrene 153 ND 652 ND 1,000 1,000 1,000 Indeno(1,2,3-cd)pyrene 90.1 ND 602 ND 500 500 500 Dibenzo(a,h)anthracene ND ND 95.2 ND 330 330 330 Benzo(g,h,i)perylene 84.4 ND 536 ND 100,000 100,000 100,000 Metals mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg Aluminum 4,330 2,510 4,830 2,610 NS NS NS Arsenic 8.13 ND ND ND 13 16 16 Barium 126 23.1 84.5 31.9 350 350 400 Calcium 4,560 1,070 32,400 1,820 NS NS NS Chromium 8.54 7.60 8.67 12.6 30 36 180 Cobalt 5.71 3.12 3.01 2.39 NS NS NS Copper 22.8 11.4 13.8 12.1 50 270 270 Iron 8,890 5,710 6,970 6,480 NS NS NS Lead 148 5.07 97.0 16.7 63 400 400 Magnesium 2,250 1,530 2,200 1,520 NS NS NS Manganese 483 222 151 51.1 1,600 2,000 2,000 Nickel 11.9 8.28 7.81 7.74 30 140 310 Potassium 873 524 985 636 NS NS NS Sodium 219 96.8 178 96.2 NS NS NS Thalium ND ND 2.10 ND NS NS NS Vandium 12.7 10.6 15.4 10.8 NS NS NS Zinc 153 28.0 69.7 39.1 109 2,200 10,000 Mercury 0.2 0.02 0.41 0.23 0.18 0.81 0.81

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

TABLE 3 DISPOSAL QUANTITIES AND DISPOSAL FACILITIES

Disposal Location/Address Type of Material Quantity Clean Earth of Philadelphia Non-Hazardous 3201 S. 61st Street 2,663.68 tons (3,729.15 cubic yards) Soil Philadelphia, PA 19153 Clean Earth of North Jersey Characteristic 105 Jocobus Avenue 3,602.14 tons (5,042.99 cubic yards) Hazardous Soil Kearny, New Jersey 07032 Clean Earth of North Jersey Non-Regulated Soil 105 Jocobus Avenue 800.87 tons (1,121.24 cubic yards) with High Lead Kearny, New Jersey 07032

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

TABLE 4 WASTE CHARACTERIZATION GRID SAMPLE RESULTS

Grid-1 Grid-1 Grid-1 Grid-2 Grid-2 Grid-2 Grid-3 Grid-3 Grid-3 Grid-4 Grid-4 Grid-4 Grid-5 Grid-5 Grid-5 Grid-6 Grid-6 Grid-6 Constituents NYSDEC Part 375 Restricted Residential SCO 0-4’ 4-8’ 8-12’ 0-4’ 4-8’ 8-12’ 0-4’ 4-8’ 8-12’ 0-4’ 4-8’ 8-12’ 0-4’ 4-8’ 8-12’ 0-4’ 4-8’ 8-12’ Total Semi-Volatiles ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg Naphthalene ND ND ND ND ND 182 ND ND ND ND ND ND ND ND ND ND ND ND 100,000 Acenaphthylene 701 ND ND ND ND ND ND ND ND ND ND ND 899 ND ND ND ND ND 100,000 Acenaphthene 1,100 ND ND ND ND 46.2 ND ND ND ND ND ND ND ND ND ND ND ND 100,000 Dibenzofuran 539 ND ND ND ND 372 ND ND ND ND ND ND ND ND ND ND ND ND NS Flourene 1,560 ND ND ND ND 194 ND ND ND ND ND ND 899 ND ND ND ND ND 100,000 Phenanthrene 16,800 ND ND ND ND 3,100 ND 2,160 ND 1,350 1,430 87.1 12,000 ND ND 158 534 ND 100,000 Anthracene 4,340 ND ND ND ND 102 ND 587 ND ND ND ND 2,560 ND ND ND ND ND 100,000 Carbazole 524 ND ND ND ND 208 ND ND ND ND ND ND 792 ND ND ND ND ND NS Flouranthene 19,200 195 ND 987 ND 2,910 1,350 5,570 ND 4,160 2,550 145 20,900 ND 633 435 987 84.9 100,000 Pyrene 20,400 191 ND 1,000 ND 2,320 1,380 5,560 ND 4,360 2,630 130 19,200 ND 656 441 994 94.8 100,000 Benzo-a-Anthracene 11,000 104 ND 560 ND 835 964 3,300 ND 2,750 1,450 80.7 12,100 ND 502 276 735 95.7 1,000 Chrysene 9,930 101 ND 560 ND 1,050 964 3,470 ND 3,090 1,740 80.0 11,200 ND 486 219 772 117 3,900 Bis(2-Ethylhexyl)phthalate ND ND ND ND ND 129 ND 12,700 390 ND ND 107 ND ND ND ND 1,310 435 NS Di-n-octyl-phthalate ND ND ND ND ND ND ND 2,050 ND ND ND ND ND ND ND ND ND ND NS Benzo-b-Flouranthene 10,500 191 ND 777 ND 1,160 1,130 4,140 ND 3,950 1,830 110 12,800 ND 540 242 868 280 1,000 Benzo-k-Flouranthene 3,210 180 ND ND ND 561 556 1,450 ND 1,770 651 48.9 3,990 ND ND 138 519 130 3,900 Benzo-a-Pyrene 7,410 189 ND 544 ND 713 978 2,710 ND 2,840 1,340 58.8 9,920 ND ND 192 638 121 1,000 Indeno(1,2,3-c,d)Pyrene 4,530 74.7 ND ND ND 429 556 2,080 ND 1,890 935 51.0 6,720 ND ND 141 571 184 500 Dibenzo-a,h-Anthracene 1,060 ND ND ND ND 102 ND 511 ND 634 ND ND 1,370 ND ND 55.0 ND 66.8 330 Benzo-g,h,i-Perylene 5,310 98.3 ND 482 ND 470 756 2,650 ND 2,590 1,000 56.7 7,420 ND 556 165 660 212 100,000 2-Nitrophenol ND 46.5 42.4 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NS 2-Methylnaphthalene ND ND ND ND ND 231 ND ND ND ND ND ND ND ND ND ND ND ND NS Benzoic Acid ND 161 147 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NS Hexachlorocyclopentadiene ND 77.0 70.9 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NS 2-Nitroaniline ND 48.8 43.1 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NS 2,6-Dintrotoluene ND 51.8 48.0 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NS 3-Nitroaniline ND 54.9 50.0 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NS 2,4-Dinitrophenol ND 270 251 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NS 2,4-Dinitrotoluene ND 82.3 75.8 ND 82.1 ND ND ND ND ND ND ND ND ND ND ND ND ND NS 4-Nitroaniline ND 45.7 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NS 4,6-Dinitro-2-methylphenol ND 205 227 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NS Pentachlorophenl ND 73.9 66.7 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NS TCLP Semi-Volatiles No TCLP Semi-Volatile Organic Compounds were Detected Total Volatiles ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg Bromomethane 11.9 ND ND 8.78 ND ND ND ND ND ND ND ND 7.63 ND ND ND ND ND NS Acetone ND ND ND ND ND 158 71.1 70.2 59.3 ND ND ND ND ND 66.1 75.1 ND ND 100,000 Methylene Chloride 9.22 ND ND 12.0 ND 5.98 7.04 12.2 8.34 57.8 ND 6.65 8.66 ND 11.8 75.1 8.41 11.1 100,000 Carbon Disulfide ND ND ND ND ND ND 10.5 ND ND ND ND ND 8.94 ND ND ND ND ND NS Methyl Ethyl Ketone ND ND ND ND ND 13.4 11.6 ND ND ND ND ND ND ND ND ND ND ND 100,000 Benzene ND ND ND ND ND ND ND ND ND ND ND ND ND ND 15.3 ND ND ND 4,800 Toluene ND ND ND ND ND 14.9 ND ND ND ND ND ND 6.88 ND 19.6 ND ND ND 100,000 TCLP Volatiles No TCLP Volatile Organic Compounds were Detected TCLP Pesticides No TCLP Pesticides were Detected TCLP Herbicides ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg 2,4,5-TP (Silvex) ND ND ND ND ND 2.04 ND ND ND ND ND ND ND ND ND ND ND ND NS PCBs No TCLP PCB’s were Detected

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

TABLE 4, Con’t WASTE CHARACTERIZATION GRID SAMPLE RESULTS

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

TABLE 5 BACKFILL ANALYTICAL RESULTS

Constituents WC-NATIVE-01 WC-NATIVE-02 WC-NATIVE-03 WC-NATIVE-04 WC-NATIVE-05 6 NYCRR Part 375 Unrestricted Use 6 NYCRR Part 375 Residential 6 NYCRR Part 375 Restricted Residential Volatile Organics ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg Methylene Chloride 6.7 ND ND ND ND ND ND ND Semi Volatile Organics None Detected Pesticides None Detected Herbicides None Detected PCBs None Detected Metals mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg Aluminum 4,710 2,610 4,760 5,240 3.320 NS NS NS Arsenic 1.55 1.13 1.73 1.87 1.67 13 16 16 Barium 28.6 20.5 30.2 44.7 21 350 350 400 Calcium 887 4,630 982 1,080 12,500 NS NS NS Chromium 11.9 6.31 11 16.8 7.7 30 36 180 Cobalt 4.95 2.76 5.29 5.33 3.89 NS NS NS Copper 13.7 9.05 12.3 14.8 9.52 50 270 270 Iron 8,810 5,750 9,490 9,650 7,610 NS NS NS Lead 3.12 1.80 2.26 3.48 1.90 63 400 400 Magnesium 2,380 3,640 2,580 2,950 8,320 NS NS NS Manganese 224 164 269 312 198 1,600 2,000 2,000 Nickel 10.9 6.59 10.9 11.6 8.83 30 140 310 Potassium 858 424 778 804 487 NS NS NS Selenium 1.85 1.27 2.14 2.60 1.59 NS NS NS Sodium 87.2 75.3 94.6 106 83.2 NS NS NS Thalium ND ND ND ND ND NS NS NS Vandium 15.5 7.79 16.4 17.5 12 NS NS NS Zinc 22.4 13.1 29.9 21 18.8 109 2,200 10,000 Mercury ND ND ND ND ND 0.18 0.81 0.81

2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017

FIGURES

D V L B

L L E W O P

C M A D A D V L B

L L E W O P W 12 C 7 S M T A D A

W 12 6 ST

FIGURE 1 2135-2139 Adam Clayton Powell SITE BOUNDARY MAP Jr. Boulevard, Harlem Source: ESRI Web Mapping Service

Scale: 1 inch = 50 feet RAR Sources: Esri, HERE, DeLorme, USGS, Intermap, increment P Corp., NRCAN, Esri Japan, METI, Esri China (Hong Kong), Esri (Thailand), MapmyIndia, © OpenStreetMap contributors, and the GIS User Community

FIGURE 2 2135-2139 Adam Clayton Powell LOCATION MAP Jr. Boulevard, Harlem Source: ESRI Web Mapping Service

Scale: 1 inch = 100 feet RAR FIGURE 3 DEVELOPMENT PLAN 2135 Adam Clayton Powell Jr Blvd Source: Urban Quotient Site Plan: A Home for Harlem Dowling, 6/19/2014 RAR Scale (appx) :1 inch = 25 feet Ü FIGURE 4 2135 - 2139 CELLAR PLAN Adam Clayton Powell Jr. Boulevard, Source: Architect Urban Quotient, 2015 Harlem Scale: NTS RAR D V L B

L L E W O P C M A D A W 12 7 ST

8 1

9 2

Legend Hazardous Lead Excavated 0 to 4 feet Site Grid (with number)

FIGURE 5-1 2135 - 2139 HAZARDOUS LEAD Adam Clayton Powell Jr. Boulevard, EXCAVATION LOCATION MAP Harlem Source: Bing Maps Orthophotos, 2014 RAR Scale: 1 inch = 25 feet D V L B

L L E W O P C M A D A W 12 7 ST

8 1

9 2

Legend Hazardous Lead Excavated 4 to 8 feet Site Grid (with number)

FIGURE 5-2 2135 - 2139 HAZARDOUS LEAD Adam Clayton Powell Jr. Boulevard, EXCAVATION LOCATION MAP Harlem Source: Bing Maps Orthophotos, 2014 RAR Scale: 1 inch = 25 feet D V L B

L L E W O P C M A D A W 12 7 ST

8 1

9 2

Legend Hazardous Lead Excavated 8 to 12 feet Site Grid (with number)

FIGURE 5-3 2135 - 2139 HAZARDOUS LEAD Adam Clayton Powell Jr. Boulevard, EXCAVATION LOCATION MAP Harlem Source: Bing Maps Orthophotos, 2014 RAR Scale: 1 inch = 25 feet D V L B

L L E W O P C M W A 12 D 7 A ST

8 1

9 2

Legend Site Grid (with number) Hazardous Lead Excavated 12 to 13 feet

2135 - 2139 FIGURE 5-4 Adam Clayton Powell EXCAVATION LOCATION MAP Jr. Boulevard, Harlem Source: Google Maps Orthophotos, 2016 RAR Scale: 1 inch = 25 feet D V L B

L L E W O P C W M 12 A 7 S D T A

8 1

9 2

FIGURE 6 2135 - 2139 ENDPOINT SAMPLE Adam Clayton Powell Jr. Boulevard, LOCATION MAP Harlem Source: Bing Maps Orthophotos, 2014 RAR Scale: 1 inch = 25 feet D V L B

L L E W O P C M W A 12 D 7 A ST

8 1

9 2

2135 - 2139 FIGURE 7 Adam Clayton Powell BACKFILL LOCATION MAP Jr. Boulevard, Harlem Source: Google Maps Orthophotos, 2016 RAR Scale: 1 inch = 25 feet GRACE PREPRUFE 300R LINER

FIGURE 8 2135 - 2139 LOCATION OF SOIL VAPOR BARRIER Adam Clayton Powell Jr. Boulevard, Source:Urban Quotient Site Plan: A Home for Harlem Dowling, 2014 Harlem Scale: NTS (schematic) RAR GRACE PREPRUFE 300R LINER

FIGURE 8 2135 - 2139 LOCATION OF SOIL VAPOR BARRIER Adam Clayton Powell Jr. Boulevard, Source: Architect Urban Quotient, 2015 Harlem Scale: NTS (schematic) RAR FIGURE 9 2135 - 2139 SSDS PLAN Adam Clayton Powell Jr. Boulevard, Source: Ecosystems Strategies, Inc, 2014; base from Urban Quotient Harlem Scale: NTS (schematic) RAR 2139 Adam Clayton Powel, Jr. Boulevard Remedial Action Report March 2017