VAPOR INTRUSION ASSESSMENT REPORT PUBLIC SCHOOL 152Q ND STREET QUEENS, NEW YORK 11377

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1 VAPOR INTRUSION ASSESSMENT REPORT OF PUBLIC SCHOOL 152Q ND STREET QUEENS, NEW YORK SCA LLW NO.: SCA CONTRACT NO.: C IEH JOB NO.: TRC PROJECT NO.: March 27, 2014 Prepared by: Prepared for: TRC Engineers, Inc Broadway, 10 th Floor NYCSCA Thomson Avenue New York, NY Long Island City, NY Phone: (212) Phone: (718) Fax: (212) Fax: (718) Attn: Mr. Charles Guder Attn: Ms. Lee Guterman

2 VAPOR INTRUSION INVESTIGATION REPORT PS 152Q ND STREET QUEENS, NEW YORK TABLE OF CONTENTS Section Page EXECUTIVE SUMMARY INTRODUCTION BACKGROUND PURPOSE DESCRIPTION OF VI ASSESSMENT FIELD ACTIVITIES VAPOR INTRUSION SAMPLING Building Inspection and Chemical Inventory Indoor and Ambient Air Sampling Sub-Slab Soil Vapor Sampling SITE SETTING SITE DESCRIPTION SITE PHYSICAL CHARACTERISTICS Topography Geology Soils Hydrology DISCUSSION OF FINDINGS APPLICABLE REGULATORY CRITERIA Indoor Air Sampling Guidelines Ambient Air Sampling Guidelines Sub-Slab Soil Vapor Sampling Guidelines INDOOR AIR SAMPLING FINDINGS AMBIENT AIR SAMPLING FINDINGS SUB-SLAB SOIL VAPOR SAMPLING FINDINGS SUMMARY OF FINDINGS CONCLUSIONS AND RECOMMENDATIONS SIGNATURES OF ENVIRONMENTAL PROFESSIONALS REFERENCES TRC ENGINEERS, INC. I

3 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK LIST OF TABLES Table 1 List of Potential Chlorinated Solvent VOCs in Soil Vapor and Ambient Air Table 2 Summary of Results of Analysis of Sub-Slab Soil Vapor, Indoor Air and Ambient Air Samples Figure 1 Site Location Map LIST OF FIGURES Figure 2 Sub-Slab and Indoor Air Sample Location Plan APPENDICES APPENDIX A INDOOR AIR QUALITY QUESTIONNAIRE APPENDIX B LABORATORY ANALYTICAL DATA REPORTS APPENDIX C LABORATORY CERTIFICATION TRC ENGINEERS, INC. II

4 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK EXECUTIVE SUMMARY On behalf of the New York City School Construction Authority (NYCSCA), TRC Engineers, Inc. (TRC) conducted a Vapor Intrusion (VI) Assessment at Public School (PS) 152Q located at nd Street, Queens, New York (the Site ). The PS 152Q site is improved with a four-story building with a basement, a three-story addition with a basement and an asphalt-paved playground. The basements of both buildings are unoccupied and comprised of crawl spaces and finished areas containing mechanical equipment, boilers, shops, and storage spaces. An initial VI Assessment was performed at the Site in August 2011 and included the collection and laboratory analysis of three (3) sub-slab soil vapor samples, three (3) indoor air samples and one (1) ambient air sample. The purpose of the initial VI Assessment was to determine if chlorinated volatile organic compounds (VOCs) found in groundwater and soil vapor at an adjacent Brownfield Cleanup Program (BCP) site and in soil vapor near a dry cleaner located on the Site block are present in sub-slab soil vapor and indoor air in the basements of the PS 152Q school building. The purpose of the initial VI Assessment was also to confirm that chlorinated VOCs detected in ambient air during previous investigations (from emissions from the nearby dry cleaner) remain below published background levels. The results of the initial VI Assessment showed that concentrations of VOCs in indoor air samples collected in the basements and in an ambient air sample collected outside the building were below the range of published background concentrations and New York State Department of Health (NYSDOH) Air Guideline Values (AGVs). Although, tetrachloroethene (PCE) and trichloroethene (TCE) were detected at elevated concentrations in one sub-slab vapor sample collected in the northeast portion of the basement (blower room) of the original portion of the school building, a co-located indoor air sample indicated that vapor intrusion was not occurring. Representatives of the NYCSCA, NYSDOH, and TRC participated in a conference call on May 22, 2012 to discuss the results of the initial VI Assessment. During the conference call, the NYSDOH requested another round of sampling to determine if the PCE and TCE concentrations found in the one sub-slab vapor sample collected from the northeast portion of the original school building (which is the closest to the BCP site) were anomalous and to document current concentrations of VOCs in sub-slab soil vapor, indoor, and ambient air. It was agreed that potential future actions would be determined based on the results of the confirmatory VI Assessment. A confirmatory VI Assessment was performed in June 2012 in response to the NYSDOH s request. The scope of the VI Assessment, which was performed in June 2012, was consistent with the initial round of sampling performed in August The VI Assessment consisted of the collection and analysis of three (3) sub-slab vapor samples and three (3) indoor air samples from the basements of the school buildings, and one (1) concurrent, outdoor ambient air sample. The results of the confirmatory June 2012 VI Assessment showed that concentrations of VOCs in indoor air samples collected in the basements and in an ambient air sample collected outside the building were below the range of published background concentrations and NYSDOH AGVs. PCE and TCE were again detected at elevated concentrations in one sub-slab vapor sample collected in the northeast portion of the basement (blower room) of the original portion of the school building, the co-located indoor air sample again confirmed that vapor intrusion was not occurring. Representatives of the NYCSCA, NYSDOH, and TRC participated in a conference call in October 2012 to discuss the results of the confirmatory VI Assessment. The NYSDOH agreed that since indoor air has not TRC ENGINEERS, INC

5 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK been impacted by VOCs in sub-slab vapor, monitoring would be acceptable and requested that the NYCSCA perform annual monitoring in the blower room during the heating season. Monitoring, consisting of a VI Assessment, was performed in February The results of the February 2013 VI Assessment were consistent with previous assessments and again confirmed that vapor intrusion was not occurring. The VI Assessment, which is the subject of this report, was performed as part of the annual monitoring in the blower room during the heating season. The scope of the VI Assessment, which was performed on February 20 and 21, 2014, consisted of the collection and analysis of one (1) sub-slab vapor sample and one (1) indoor air sample from the blower room of the school building, and one (1) concurrent, outdoor ambient air sample. Based on the results of this VI Assessment, TRC concludes the following: The concentrations of VOCs detected in indoor and ambient air samples collected as part of this VI Assessment are below the range of published background concentrations and NYSDOH AGVs and are consistent with previous sample results which indicate that vapor intrusion is not occurring. The concentrations of PCE and TCE in sub-slab vapor beneath the blower room of the original school building are significantly lower than previous sampling results. This may be attributable to seasonal variabilities in sub-slab conditions. Based on the results of the VI Assessment, TRC concludes that the Site building is suitable for continued use as a public school; however, consistent with recommendations made by the NYSDOH, TRC recommends annual monitoring during the heating season to confirm that indoor air remains unaffected by sub-slab vapor impacts believed to be caused by the adjacent BCP Site. Additionally, TRC recommends periodically contacting the NYSDEC to determine the current status of the adjacent BCP Site to determine the schedule for remediation. Based on information received from the NYSDEC Case Manager for the adjacent BCP Site, remediation of the BCP Site may commence by the end of When active remediation occurs, and subsequent annual monitoring confirms that sub-slab PCE and TCE concentrations are low, TRC recommends consultation with NYSDOH to discuss eliminating annual monitoring of the indoor air quality. TRC ENGINEERS, INC

6 1.0 INTRODUCTION VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK On behalf of the New York School Construction Authority (NYCSCA), TRC Engineers, Inc. (TRC) conducted a Vapor Intrusion (VI) Assessment at the PS 152Q school building located at nd Street, Queens, New York (hereafter referred to as the Site ). The Site location is shown on Figure 1. The VI Assessment was performed in accordance with the New York State Department of Health (NYSDOH) Final Guidance for Evaluating Soil Vapor Intrusion in the State of New York, dated October 2006 ( NYSDOH VI Guidance Document ), and the NYCSCA-approved scope of work, dated November 16, The PS 152Q site is improved with a four-story public school building with a basement, a three story addition with a basement and an asphalt-paved playground. The basements of both buildings are unoccupied and are comprised of crawl spaces and finished areas containing mechanical equipment, boilers, shops, and storage spaces. 1.1 Background A Phase I Environmental Site Assessment (ESA) was completed by TRC in January 2011 in support of a proposed new addition to PS 152Q. Of potential relevance in connection with VI, the Phase I ESA revealed the presence of the following recognized environmental conditions (RECs): A Brownfield Cleanup Program (BCP) site (No. C th Street ) at th Street which is approximately 150 feet east-southeast and downgradient of PS 152Q. Historically, the BCP site was occupied by various industrial and/or manufacturing properties and is currently used to store taxi cabs and automobile parts. Previous investigations completed at the BCP site have documented soil, soil vapor, and groundwater contamination primarily consisting of chlorinated volatile organic compounds (VOCs). Specifically, tetrachloroethene (PCE) was detected in soil at concentrations up to 19,600 parts per billion (ppb) and in groundwater at concentrations up to 14,000 ppb. In addition, PCE was detected at a concentration of 42,000 ppb in a monitoring well adjacent to and north of the BCP site. Trichloroethene (TCE) was detected in sub-slab soil vapor downgradient of the BCP site at concentrations up to 814,949 micrograms per cubic meter (µg/m 3 ), and in downgradient groundwater at concentrations up to 633 ppb. TRC understands that the BCP site is not currently under remediation; however, the remedial investigation is complete and remediation work is anticipated to begin by the end of Copies of the following six investigation reports related to the BCP Site were included as an Appendix to the Vapor Intrusion Assessment Report dated December 6, 2011: 1) Phase I Environmental Site Assessment dated February 2005; 2) Phase II Environmental Site Assessment dated April 2005; 3) Remedial Investigation Report and Remedial Investigation/Remedial Action Work Plan dated September 2005; 4) Groundwater Investigation Report dated June 2006; 5) Taxi Storage Yard Investigation Report dated August 2006; and, 6) Draft Remedial Investigation Report dated January A nearby site, Daisy Cleaners / Jong Lee, located on the Site block at nd Street, is an active dry cleaning facility, and is listed in the Registered Dry Cleaners database and Resource Conservation and Recovery Information System Generators/Transporters (RCRIS Gen/Trans) database for the generation of hazardous waste consisting of halogenated solvents. The New York State Department of Environmental Conservation (NYSDEC) performed two soil vapor surveys in the area surrounding the BCP site to determine the nature and extent of off-site soil vapor impacts. On behalf of the NYSDEC, Dvirka & Bartilucci Consulting Engineers, PC (D&B) and AECOM collected soil vapor samples in the sidewalks and right-of-ways on surrounding blocks, including the TRC ENGINEERS, INC

7 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK sidewalk in front of PS 152Q, in October 2006 and February The results of the soil vapor sampling indicated that the highest concentrations of chlorinated VOCs in the vicinity of the school building were at the southern portion of the Site block, near the Daisy Cleaners property. Additionally, PCE was detected in an ambient air sample collected by D&B in front of the original school building in October 2006 at a concentration above published background levels. TRC performed a soil vapor and ambient air quality survey on February 25, The survey consisted of the collection and laboratory analysis of five soil vapor samples and one ambient air quality sample. The soil vapor samples were collected in the 62 nd Street sidewalk adjacent to PS 152Q in locations similar to the locations where D&B and AECOM collected samples. The ambient air sample was collected in front of the main entrance of the school building. The results of the sampling confirmed that the highest concentrations of chlorinated VOCs in soil vapor were at the southern portion of the Site block, near the Daisy Cleaners property. The ambient air sample result also confirmed that PCE was present in ambient air at a concentration above published background levels. The presumed source of the PCE in ambient air was attributed to dry cleaning related discharges from the Daisy Cleaners property. Representatives of the NYCSCA, NYSDOH, and TRC participated in a conference call on April 5, 2011 to discuss available data. During the call, the NYSDOH requested a VI Assessment to determine sub-slab and indoor air concentrations of chlorinated VOCs. The NYCSCA indicated that they were concerned that the elevated levels of PCE in ambient air indicate that there is a contribution from an off-site source (i.e., the Daisy Cleaners) and that this contribution should first be eliminated in order to obtain valid data during the VI Assessment. The NYSDOH agreed to work with their counterparts at the New York City Department of Health and Mental Hygiene (NYCDHMH) and New York City Department of Environmental Protection (NYCDEP) to determine if the nearby dry cleaner (Daisy Cleaners) is complying with air emission regulations. In an dated May 10, 2011, the NYCDEP indicated that the dry cleaner modified their exhaust and measurements of organic vapors at the exhaust point while the equipment was operating measured zero or non-detect. On May 19, 2011, TRC collected two ambient air samples for laboratory analysis to determine ambient air quality in the vicinity of the school. One ambient air sample was collected at street level adjacent to the main school entrance on 62 nd Street and one ambient air sample was collected at roof level near the school addition s heating ventilating and air conditioning (HVAC) fresh air intakes. No VOCs were detected in the two ambient air samples at concentrations above NYSDOH Air Guideline Values (AGVs) and the range of published NYSDOH outdoor background levels. TRC performed an initial VI Assessment in August 2011 to confirm that the chlorinated VOCs identified in ambient air during previous investigations remain below published background levels and to determine if the chlorinated VOCs found in groundwater and soil vapor at the adjacent BCP site and in soil vapor near the dry cleaner on the Site block are present in sub-slab soil vapor and indoor air in the PS 152Q school buildings. The VI Assessment was performed in two phases. The first phase consisted of the collection and analysis of three (3) ambient air quality samples. The second phase consisted of vapor intrusion sampling and was performed following confirmation that ambient air concentrations of chlorinated VOCs were below published background levels. The vapor intrusion sampling included the collection of three (3) sub-slab vapor samples and three (3) indoor air samples from the basement of the school building, and one (1) concurrent, outdoor ambient air sample for laboratory analysis. The results of the initial VI Assessment indicated that emissions from the nearby dry cleaner exhaust system were not affecting ambient air quality in the vicinity of the school and that vapor intrusion was not occurring; however, vapor intrusion mitigation was recommended based on the concentrations of TCE and TRC ENGINEERS, INC

8 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK PCE found in sub-slab soil vapor in one sample collected below the basement in the northeast portion (blower room) of the original portion of the school building. Representatives of the NYCSCA, NYSDOH, and TRC participated in a conference call on May 22, 2012 to discuss the results of the August 2011 VI Assessment. During the conference call, the NYSDOH requested another round of sampling to determine if the PCE and TCE concentrations found in the one subslab vapor sample collected from the northeast portion (blower room) of the original school building were anomalous and to document current concentrations of VOCs in sub-slab soil vapor, indoor, and ambient air. It was agreed that potential future actions would be determined based on the results of the confirmatory VI Assessment. A confirmatory follow-up VI Assessment was performed in June 2012 in response to the NYSDOH s request. The scope of the VI Assessment was consistent with the initial VI Assessment performed in August The VI Assessment consisted of the collection and analysis of three (3) sub-slab vapor samples and three (3) indoor air samples from the basements of the school buildings, and one (1) concurrent, outdoor ambient air sample. The results of the confirmatory VI Assessment showed that concentrations of VOCs in indoor air samples collected in the basements and in an ambient air sample collected outside the building were below the range of published background concentrations and NYSDOH AGVs; however, PCE and TCE were again detected at elevated concentrations in one sub-slab vapor sample collected in the northeast portion (blower room) of the basement of the original portion of the school building. The concentrations of PCE and TCE detected in this sub-slab vapor sample were compared to the Decision Matrices in the NYSDOH VI Guidance Document. Although mitigation was the recommended action (based on the Decision Matrices), the concentrations of PCE and TCE detected in a co-located indoor air sample indicated that vapor intrusion was not occurring. Representatives of the NYCSCA, NYSDOH, and TRC participated in a conference call on October 4, 2012 to discuss the results of the June 2012 VI Assessment. Based on the results of the initial and follow-up VI Assessments, the NYSDOH agreed that vapor intrusion was not occurring. The NYSDOH recommended that annual monitoring during the heating season should be performed in the blower room of the basement. The NYSDOH also recommended installation of a permanent sub-slab vapor monitoring point, the collection and laboratory analysis of sub-slab soil vapor and indoor air samples from the blower room, and the collection and laboratory analysis of an ambient air sample from outside the school building. A VI Assessment was performed in February 2013 consistent with NYSDOH recommendations. The results of the VI Assessment indicated that the results were consistent with previous assessments and vapor intrusion was not occurring. 1.2 Purpose This VI Assessment was performed to comply with the NYSDOH s recommendation to document current concentrations of PCE and its degradation compounds (TCE, cis-1,2-dichloroethene, trans-1,2- dichloroethene, and vinyl chloride) in sub-slab soil vapor and indoor air in the basement blower room during the heating season and to document current concentrations of PCE and its degradation compounds in ambient air outside the school building. The VI Assessment consisted of the collection of one (1) sub-slab vapor sample and one (1) indoor air sample from the basement blower room of the school building, and one (1) concurrent, outdoor ambient air sample for laboratory analysis. TRC ENGINEERS, INC

9 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK DESCRIPTION OF VI ASSESSMENT FIELD ACTIVITIES VI Assessment field activities were performed between February 20 and 21, 2014 in accordance with the NYCSCA-approved scope of work dated November 2012, and included the following: A pre-sampling building inspection and chemical inventory; Collection and analysis of one (1) 8-hour duration, sub-slab vapor sample from the permanent subslab soil vapor probe installed in the basement blower room of the original PS 152Q school building; Collection and analysis of one (1) 8-hour duration, indoor air sample in the basement blower room of the PS 152Q school building concurrent with the sub-slab vapor sampling; and Collection and analysis of one (1) 8-hour duration, ambient air sample from outside of the PS 152Q school building concurrent with the indoor air sampling. Figures showing Site features and the sampling locations are provided as Figures 1 and 2. The field activities and methods are described further below. 2.1 Vapor Intrusion Sampling Building Inspection and Chemical Inventory A pre-sampling chemical inventory was conducted of the indoor air sample locations and adjacent spaces to determine if materials with the potential to affect indoor air quality were present (e.g., cleaning supplies, etc.). The pre-sampling chemical inventory was completed on February 20, The completed presampling chemical inventory form is provided as Appendix A. The basements of the school were inspected for cracks, penetrations, and other preferential pathways for soil vapor intrusion such as floor drains and sumps. Floor cracks were not identified in the subsurface walls or floors. Floor drains are present in the boiler and blower rooms; sumps are present in the boiler room. During the inspection a ppbrae photoionization detector (PID) capable of detecting VOCs in the parts per billion (ppb) range was utilized to screen indoor air for the presence of organic vapors. PID readings ranged from 70 to 100 ppb. The readings were associated with three open gasoline containers, used for the snow-blowers at the school. The gasoline containers were covered/capped and relocated. Confirmatory PID readings were taken prior to sampling on February 21, 2014 and did not exceed 0 ppb throughout the sampling area Indoor and Ambient Air Sampling The indoor air and ambient air sampling was conducted on February 21, 2014 in general accordance with the applicable procedures described in the NYSDOH VI Guidance Document. One (1) indoor air sample and one (1) ambient air sample were collected and submitted for laboratory analysis. Figure 2 shows the sampling locations. The samples were collected for laboratory analysis of VOCs as follows: Indoor air sample TRC IA-1 was collected in the northeastern portion of the main school building basement in the blower room; and TRC ENGINEERS, INC

10 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK Ambient air sample TRC-AA was collected from outside the main school building entrance at street level. The one (1) indoor air and one (1) ambient air samples were collected utilizing individually certified-clean 6-liter Summa canisters. The samples were collected for approximately eight (8) hours. The indoor and ambient air samples were collected at a height of approximately 3 to 5 feet to simulate a typical breathing zone. Immediately after opening each Summa canister, the initial vacuum (inches of mercury) in each canister was recorded as shown in the table below. After approximately eight hours, final vacuum readings (inches of mercury [Hg]) were noted and the Summa canisters were closed. All samples were collected concurrently. Summary of Sampling Field Data Canister Vacuum at Start (Inches Hg) Canister Vacuum at Completion (Inches Hg) Sample ID TRC IA TRC-AA The indoor air and ambient air samples were analyzed for the following VOCs utilizing United States Environmental Protection Agency (USEPA) Method TO-15: cis-1,2-dichloroethene, trans-1,2- dichloroethene, PCE, TCE and vinyl chloride. These VOCs were selected to include PCE and its degradation byproducts, which are the contaminants of concern identified during previous investigations. Refer to the attached Table 1 for a description of these compounds. The samples were collected for approximately eight (8) hours, in order to obtain a sufficient sample volume for a laboratory reporting limit of approximately 1.0 micrograms per cubic meter (µg/m 3 ) for the analytes. Additionally, in accordance with the NYSDOH VI Guidance Document, a reporting limit of less than 0.25 µg/m 3 was achieved for vinyl chloride and TCE. The Summa canisters were properly labeled and shipped via Federal Express to Con-Test of East Longmeadow, Massachusetts for analysis. Con-Test is a NYSDOH Environmental Laboratory Approval Program (ELAP) certified analytical laboratory for air quality sample analyses. A summary of the analytical results is presented in Table 2. The laboratory analytical data report is in Appendix B Sub-Slab Soil Vapor Sampling The sub-slab soil vapor sampling was conducted on February 21, 2014 in general accordance with the applicable procedures described in the NYSDOH VI Guidance Document. One (1) sub-slab soil vapor sample was collected and submitted for laboratory analysis. Sub-slab soil vapor sample was collected concurrently with the indoor and ambient air samples collected as described in Section Figure 2 shows the sampling locations. The samples were collected for laboratory analysis of VOCs as follows: Sub-slab soil vapor sample TRC SV-1 was collected in the northeastern portion of the main school building basement in the blower room. TRC ENGINEERS, INC

11 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK The sub-slab soil vapor sample was collected immediately below the building basement floor slab surface (i.e., less than 1 foot below the top of the basement floor slab) from a permanent sub-slab vapor probe previously installed by inserting polyethylene tubing to a depth immediately below the building floor slab and sealing the annular space with cement and hydrated bentonite. The adequacy of the seal was tested prior to sampling in accordance with the NYSDOH-approved method for vapor sampling using a 5-gallon bucket or cardboard box placed over the permanent vapor probe. Helium tracer gas was then pumped into the bucket/box. The above grade end of the tubing, which is the sample collection point, was then attached to a helium gas detector. The adequacy of the seal was verified by direct helium readings of less than 10 percent. The sub-slab soil vapor sample was collected utilizing individually certified-clean 6-liter Summa canisters. The sample was collected for approximately eight (8) hours. The sub-slab vapor sample was collected by connecting the polyethylene tubing directly to the Summa canisters. Immediately after opening each Summa canister, the initial vacuum (inches of mercury) in each canister was recorded as shown in the table below. After approximately eight hours, final vacuum readings (inches of mercury) were noted and the Summa canisters were closed. Summary of Sampling Field Data Sample ID Canister Vacuum at Start (Inches Hg) Canister Vacuum at Completion (Inches Hg) TRC SV The sub-slab soil vapor samples were analyzed for the following VOCs utilizing USEPA Method TO-15: cis-1,2-dichloroethene, trans-1,2-dichloroethene, PCE, TCE and vinyl chloride. These VOCs were selected to include PCE and its degradation byproducts, which are the contaminants of concern identified during previous investigations. Refer to the attached Table 1 for a description of these compounds. The sample was collected for approximately eight (8) hours, in order to obtain a sufficient sample volume for a laboratory reporting limit of approximately 1.0 µg/m 3 for the analytes. The Summa canister was properly labeled and shipped via Federal Express to Con-Test of East Longmeadow, Massachusetts for analysis. Con-Test is a NYSDOH Environmental Laboratory Approval Program (ELAP) certified analytical laboratory for air quality sample analyses. A summary of the analytical results is presented in Table 2. The laboratory analytical data report is in Appendix B. Upon completion of sampling at the permanent sub-slab soil vapor point, the tubing was capped for future sampling events. TRC ENGINEERS, INC

12 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK SITE SETTING 3.1 Site Description PS 152Q is located at nd Street, Queens, NY The site of PS 152Q is improved with a fourstory building with a basement, a three-story addition with a basement and an asphalt-paved playground. The basements of both buildings are unoccupied and comprised of crawl spaces and finished areas containing mechanical equipment, boilers, shops, and storage spaces. A Site location map is shown on Figure 1 and sampling locations are shown on Figure Site Physical Characteristics Information regarding topography, geology, site soils, and hydrology was obtained from previous site investigations and assessments and is summarized below Topography Based on field observations, the topography of the Site slopes downward slightly from west to the east. The topography of the surrounding area generally slopes downward from southwest to northeast. According to the United States Geological Survey (USGS) 7.5-Minute Quadrangle Map (Central Park, NY 1995), the elevation of the Site property is approximately 37 feet above mean sea level (amsl) Geology The geology of Queens County consists of unconsolidated glacial deposits overlying crystalline bedrock. Based on available literature (Buxton, Soren, Posner, and Shernoff, 1981), the subsurface geology of the Site likely includes the following formations: Pleistocene upper glacial deposits, Gardiners Clay, Jameco Gravel, Cretaceous Raritan Formation consisting of sands and clays, and crystalline bedrock. The depth to crystalline bedrock for the area is estimated to be approximately 120 feet below ground surface (bgs) Soils According to the U.S. Department of Agriculture (USDA) Soil Conservation Service (SCS) STATSGO data, soil in the area of the Site is described as Urban Land. Urban Land refers to soils that have been altered by human activities thus making them unidentifiable. Typically, these soils have been mixed with other materials, such as brick and concrete (urban fill), and characteristics can only be determined by onsite investigation Hydrology The Site is located approximately 1.75 miles south of Bowery Bay and approximately 2.25 miles northeast of Maspeth Creek, an extension of the East River. Based on topography in the area, the assumed hydraulic gradient direction is towards the northeast. Based on depth to groundwater measured on June 6, 2012 from groundwater monitoring wells installed to verify the groundwater elevation at the Site, the water table is approximately 11 feet below sidewalk grade. TRC ENGINEERS, INC

13 4.0 DISCUSSION OF FINDINGS VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK This section presents a discussion of the findings of the VI Assessment. 4.1 Applicable Regulatory Criteria This subsection identifies the regulatory criteria used to evaluate the results of the sub-slab, indoor, and ambient air samples. The standards and guidelines used to evaluate the specific data are described individually below Indoor Air Sampling Guidelines The analytical results for the indoor air samples were compared to the NYSDOH AGVs presented in the NYSDOH VI Guidance Document and the NYSDOH September 2013 Tetrachloroethene in Indoor and Outdoor Air Fact Sheet. Analytical results for the indoor air samples were also compared to background levels of VOCs in indoor air presented in Appendix C of the NYSDOH VI Guidance Document, including: Upper Fence Limit indoor air values from Table C-1. NYSDOH 2003: Study of Volatile Organic Chemicals in Air of Fuel Oil Heated Homes; 90 th Percentile indoor air values from Table C-2. EPA 2001: Building Assessment and Survey Evaluation (BASE) Database, SUMMA canister method; and, the 95 th Percentile Indoor Air Values from Table C-5. HEI 2005: Relationship of Indoor, Outdoor and Personal Air. In addition, the results were compared to the 95th Percentile Concentrations in Existing Residences published in Appendix X7 of ASTM E Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate Transactions Ambient Air Sampling Guidelines Analytical results for the ambient air sample were compared to the NYSDOH AGVs presented in the NYSDOH VI Guidance Document and the NYSDOH September 2013 Tetrachloroethene in Indoor and Outdoor Air Fact Sheet. Additionally, analytical results were also compared to background levels of VOCs in outdoor air presented in Appendix C of the NYSDOH VI Guidance Document, including: Upper Fence Limit outdoor air values from Table C-1. NYSDOH 2003: Study of Volatile Organic Chemicals in Air of Fuel Oil Heated Homes; 90 th Percentile outdoor air values from Table C-2. EPA 2001: BASE Database, SUMMA canister method; and, the 95 th Percentile Outdoor Air Values from Table C-5, HEI 2005: Relationship of Indoor, Outdoor and Personal Air Sub-Slab Soil Vapor Sampling Guidelines The results of analyses of the sub-slab vapor samples were compared to the NYSDOH AGVs and to background levels of VOCs in indoor air presented in Appendix C of the NYSDOH VI Guidance Document, including: Upper Fence Limit indoor air values from Table C-1. NYSDOH 2003: Study of Volatile Organic Chemicals in Air of Fuel Oil Heated Homes, 90 th Percentile indoor air values from Table C-2. EPA 2001: BASE Database, SUMMA canister method, and the 95 th Percentile Indoor Air Values from Table C-5, HEI 2005: Relationship of Indoor, Outdoor and Personal Air. In addition, the results were compared to the 95th Percentile Concentrations in Existing Residences published in Appendix X7 of ASTM E Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate Transactions. TRC ENGINEERS, INC

14 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK Finally, sub-slab soil vapor and indoor air sampling results were compared to the Decision Matrices in the NYSDOH VI Guidance Document. A comparison of these results using the Decision Matrices indicates whether or not vapor intrusion is occurring (or is likely to occur) and provides the NYSDOH s recommended actions (e.g., monitoring, mitigation, etc.). 4.2 Indoor Air Sampling Findings The NYSDOH has established AGVs for two (2) of the VOCs (PCE and TCE) analyzed in the indoor air sample. A summary of the indoor air sampling results compared to their respective AGVs is as follows: PCE was detected in the indoor air sample at a concentration of 2.3 µg/m 3 which is below the AGV of 30 µg/m 3. TCE was detected in the indoor air sample at a concentration of 0.21 µg/m 3 which is below the AGV of 5 µg/m 3. A review of the results of the indoor air sampling indicates that two of the five VOCs analyzed were detected in the indoor air sample. There were no VOCs detected above the range of anticipated indoor background levels. The indoor air sampling results are consistent with the indoor air sampling results from previous vapor intrusion investigations performed at the Site. The attached Table 2 presents the comparison of the historic and current sampling data. The complete laboratory analytical data report for the current sampling round is included in Appendix B. 4.3 Ambient Air Sampling Findings The NYSDOH has established AGVs for two (2) of the VOCs (PCE and TCE) analyzed in the ambient air sample. A summary of the ambient air sampling results compared to their respective AGVs are as follows: PCE was detected in the ambient air sample at 4.7 µg/m 3 which is below the AGV of 30 µg/m 3. TCE was not detected in the ambient air sample. A review of the results of the ambient air sampling indicates that only one (PCE) of the five VOCs analyzed was detected in the ambient air sample. There were no VOCs detected above the range of anticipated outdoor background levels. The ambient air sampling results indicate that the results are consistent with previous VI Assessments performed at the Site and also that emissions from the nearby dry cleaner exhaust system are not currently affecting ambient air quality in the vicinity of the school. The attached Table 2 presents the comparison of the historic and current sampling data. The complete laboratory analytical data report for the current sampling round is included in Appendix B. TRC ENGINEERS, INC

15 4.4 Sub-Slab Soil Vapor Sampling Findings VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK The NYSDOH has established AGVs for two (2) of the VOCs (PCE and TCE) analyzed in the sub-slab vapor sample. A summary of the sub-slab soil vapor sampling results compared to their respective AGVs are as follows: PCE was detected in the sub-slab vapor sample at 4.8 µg/m 3 which is below the AGV of 30 µg/m 3. TCE was not detected in the sub-slab vapor sample. Sub-slab soil vapor and indoor air sampling results for PCE were compared to Matrix 2 of the NYSDOH VI Guidance Document. Based on the Decision Matrices, the recommended action for the PCE concentration found in sub-slab soil vapor is to take reasonable and practical actions to identify source(s) and reduce exposures. The concentration of PCE found in sub-slab soil vapor is significantly lower than previous sub-slab sampling results for the blower room (PCE concentrations historically ranged from 740 to 2,900 µg/m 3 ). Additionally, TCE was not detected during the current sampling round (previous sub-slab sampling results ranged from 390 to 880 µg/m 3 ). The decrease in PCE and TCE concentrations may be attributable to variabilities in sub-slab conditions. The attached Table 2 presents the comparison of the historic and current sampling data. The complete laboratory analytical data report for the February 2014 sampling is included in Appendix B. 4.5 Summary of Findings On February 20 and 21, 2014, TRC performed a building inspection, chemical inventory, and collected one (1) indoor air, one (1) ambient air, and one (1) sub-slab soil vapor sample for laboratory analysis. There were no interfering conditions noted during sampling. The laboratory analytical results indicate that no VOCs were detected in the indoor or ambient air samples at concentrations above the corresponding NYSDOH AGVs or above the range of anticipated background levels. Ambient air sampling results indicate that emissions from the nearby dry cleaner exhaust system are not currently affecting ambient air quality in the vicinity of the school. A comparison of the current data to the results from the previous VI Assessments indicates that sub-slab vapor sampling results of PCE and TCE in the sub-slab vapor sample collected from the basement boiler room are significantly lower than previous sample results which may be attributable to variabilities in subslab conditions. The co-located indoor air sample results indicate that vapor intrusion is not occurring. TRC ENGINEERS, INC

16 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK CONCLUSIONS AND RECOMMENDATIONS Based on the results of this VI Assessment, TRC concludes the following: The concentrations of VOCs detected in indoor and ambient air samples collected as part of this VI Assessment are below the range of published background concentrations and NYSDOH AGVs and are consistent with previous sample results which indicate that vapor intrusion is not occurring. The concentrations of PCE and TCE in sub-slab vapor beneath the blower room of the original school building are significantly lower than previous sampling results. This may be attributable to remedial actions performed on the adjacent BCP site or to variabilities in sub-slab conditions. Based on the results of the VI Assessment, TRC concludes that the Site building is suitable for continued use as a public school; however, consistent with recommendations made by the NYSDOH, TRC recommends annual monitoring during the heating season to confirm that indoor air remains unaffected by sub-slab vapor impacts believed to be caused by the adjacent BCP Site. Additionally, TRC recommends periodically contacting the NYSDEC to determine the current status of the adjacent BCP Site to determine the schedule for remediation. Based on information received from the NYSDEC Case Manager for the adjacent BCP Site, remediation of the BCP Site may commence by the end of When active remediation occurs, and subsequent annual monitoring confirms that sub-slab PCE and TCE concentrations are low, TRC recommends consultation with NYSDOH to discuss eliminating annual monitoring of the indoor air quality. TRC ENGINEERS, INC

17 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK SIGNATURES OF ENVIRONMENTAL PROFESSIONALS TRC Engineers, Inc. (TRC) has performed a VI Assessment for Public School 152Q located at nd Street, Queens, New York The VI Assessment was performed in general accordance with the NYCSCA-approved scope of work dated November 16, 2012, as indicated in Section 2.0. TRC Engineers, Inc. Prepared By: Daniel Schmidt Junior Engineer Reviewed By: Charles Guder Senior Project Manager TRC ENGINEERS, INC

18 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK REFERENCES American Society for Testing and Materials, ASTM E , Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate Transactions. Buxton, Herbert, Soren, Julian, Posner Alex, and Shernoff, Peter, Reconnaissance of the Ground- Water Resources of Kings and Queens Counties, New York., 1981 New York State Department of Health, Center for Environmental Health, Bureau of Environmental Exposure Investigation, Guidance for Evaluating Soil Vapor Intrusion in the State of New York, October New York State Department of Health, Tetrachloroethene (Perc) in Indoor and Outdoor Air, September 2013 Fact Sheet TRC Phase I Environmental Site Assessment Report, Proposed Addition to Public School 152Q, Northern Boulevard and to Northern Boulevard, Queens, New York, 11377, January 2011 TRC Vapor Intrusion Assessment Report, PS 152Q, nd Street, Queens, NY 11377, December TRC Vapor Intrusion Assessment Report, PS 152Q, nd Street, Queens, NY 11377, July TRC Vapor Intrusion Assessment Report, PS 152Q, nd Street, Queens, NY 11377, February TRC Vapor Intrusion Monitoring Scope of Work and Proposal, PS 152Q, nd Street, Queens, NY 11377, November USGS Fact Sheet , Water-Table Configuration in Kings and Queens Counties, New York March TRC ENGINEERS, INC

19 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK FIGURES TRC ENGINEERS, INC

20 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK Figure 1 Site Location Map TRC ENGINEERS, INC

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22 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK Figure 2 Sub-Slab and Indoor Air Sample Location Plan TRC ENGINEERS, INC

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24 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK TABLES TRC ENGINEERS, INC

25 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK TABLE 1 LIST OF POTENTIAL CHLORINATED SOLVENT VOCS IN SOIL VAPOR AND AMBIENT AIR The following suite of 5 volatile organic compounds (VOCs) parameters has been selected from the TO-15 expanded list based on the results of previous investigations: 1. The compounds are listed in TO-15, 2. The compounds are associated with potential soil vapor concerns associated with dry cleaner solvent management or auto repair facilities, and 3. The VOCs are analyzed by NYSDEC at ambient VOC monitoring stations in New York City. Compound Rationale for Including in Parameter Suite 1 cis-1,2-dichloroethene Breakdown product of PCE and TCE 2 trans-1,2-dichloroethene Breakdown product of PCE and TCE 3 Tetrachloroethene (PCE) Dry cleaning solvent 4 Trichloroethene (TCE) Breakdown product of PCE 5 Vinyl Chloride Breakdown product of PCE & TCE TRC ENGINEERS, INC

26 Table 2 Summary of Results of Analysis of Indoor Air, Sub-Slab Soil Vapor and Ambient Air Samples Volatile Organic Compounds PS 152Q Main School Building nd Street Queens, New York SAMPLE LOCATION SAMPLE NAME TRC-IA-3 TRC-IA-3 TRC IA-01 TRC IA-01 TRC-SSSV-3 TRC-SSSV-3 TRC SV-01 TRC SV-01 TRC-AA TRC-AA TRC-AA TRC-AA LAB ID NO. 11H F B B H F B B H F B B DATE SAMPLE COLLECTED 8/16/2011 6/7/2012 2/18/2013 2/21/2014 8/16/2011 6/7/2012 2/18/2013 2/21/2014 8/16/2011 6/7/2012 2/18/2013 2/21/2014 Indoor Outdoor Indoor Outdoor Indoor Outdoor Indoor COMPOUND (µg/m 3 ) (µg/m3) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m3) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m3) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) cis-1,2-dichloroethene <0.16 <0.14 <0.14 <0.14 <0.40 <0.40 <0.40 <0.40 <0.16 <0.14 <0.14 < <1.8 < trans-1,2-dichloroethene <0.16 <0.14 <0.14 <0.14 <0.40 <0.40 <0.40 <0.40 <0.16 <0.14 <0.14 < Tetrachloroethene (PCE) Trichloroethene (TCE) <0.54 <0.21 <0.19 <0.19 < Vinyl chloride <0.10 <0.090 <0.090 <0.090 <0.26 <0.26 <0.26 <0.26 <0.10 <0.090 <0.090 < <1.8 < Notes: µg/m 3 = micrograms per cubic meter < - Less than reporting limit Indoor air results shown in bold font and shading equal or exceed the range of published background indoor air concentrations. -- = Not Available AGV - Air Guideline Value NYSDOH - New York State Department of Health BASE - Building Assessment and Survey Evaluation HEI RIOPA - Health Effect Institute: Relationship of Indoor, Outdoor and Personal Air (1) - From ASTM E "Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate Transactions", Appendix X7 (2) - Per Appendix C of the Final NYSDOH Guidance. Indoor Air Sub-Slab Soil Vapor Ambient Air Basement - Blower Room Basement - Blower Room Outside School Building NYSDOH AGV ASTM E 2600 Concentration in Existing Residences - 95th Percentile (1) NYSDOH Fuel Oil 2003 Upper Fence Limit (2) USEPA BASE Data 90th Percentile Value (2) HEI RIOPA th Percentile Value (2) TRC Engineers, Inc. 3/25/2014

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51 Air Sampling Media Certificate of Analysis Date Analyzed: 1/22/2014 Batch #: 14CC0040 Certification Type: Batch Certified Individual Certified Media Type: Summa Canister Flow Controllers Media IDs: BC1478 Note:Two ID's grouped together, for example BC2136/BC3145, represents matched pairs of certified summa canisters and flow controllers. Units: PPBv Propene Vinyl acetate Dibromchloromethane <0.80 <0.04 <0.02 Dichlorodifluoromethane Hexane 1,2-Dibromomethane <0.02 <0.80 <0.02 Chloromethane Ethyl acetate Tetrachloroethylene <0.04 <0.02 <0.02 Freon 114 Chloroform Chlorobenzene <0.02 <0.02 <0.02 Vinyl chloride Tetrahydrofuran Ethylbenzene <0.02 <0.02 < Butadiene 1,2-Dichloroethane m,p-xylenes <0.02 <0.02 <0.04 Bromomethane 1,1,1-Trichloroethane Bromoform <0.02 <0.02 <0.02 Chloroethane Benzene Styrene <0.02 <0.02 <0.02 Acrolein Carbon Tetrachloride o-xylene <0.08 <0.02 <0.02 Acetone Cyclohexane 1,1,2,2-Tetrachloroethane <0.80 <0.02 <0.02 Trichlorofluoromethane 1,2-Dichloropropane 4-Ethyltoluene <0.02 <0.02 <0.02 Ethanol Bromodichloromethane 1,3,5-Trimethylbenzene <0.80 <0.02 <0.02 1,1-Dichloroethylene Trichloroethylene 1,2,4-Trimethylbenzene <0.02 <0.02 <0.02 Methylene chloride 1,4-Dioxane 1,3-Dichlorobenzene <0.20 <0.02 <0.02 Freon 113 Methylmethacrylate Benzyl chloride <0.02 <0.02 <0.02 Carbon disulfide Heptane 1,4-Dichlorobenzene <0.02 <0.02 <0.02 t-1,2-dichloroethylene MIBK 1,2-Dichlorobenzene <0.02 <0.02 <0.02 1,1-Dichloroethane c-1,3-dichloropropylene 1,2,4-Trichlorobenzene <0.02 <0.02 <0.04 MTBE t-1,3-dichloropropylene Naphthalene <0.02 <0.02 <0.02 IPA 1,1,2-Trichloroethylene Hexachlorobutadiene <0.80 <0.02 < Butanone (MEK) <0.80 <0.02 c-1,2-dichloroethylene <0.02 <0.02 Toluene 2-Hexanone (MBK) Special Notes: Analyst Initials/Date: WSD 3/3/14 Page 16 of 18 14B0665_1 Contest_Final

52 Air Sampling Media Certificate of Analysis Date Analyzed: 1/22/2014 Batch #: 14CC0041 Certification Type: Batch Certified Individual Certified Media Type: Summa Canister Flow Controllers Media IDs: BC1344 Note:Two ID's grouped together, for example BC2136/BC3145, represents matched pairs of certified summa canisters and flow controllers. Units: PPBv Propene Vinyl acetate Dibromchloromethane <0.80 <0.04 <0.02 Dichlorodifluoromethane Hexane 1,2-Dibromomethane <0.02 <0.80 <0.02 Chloromethane Ethyl acetate Tetrachloroethylene <0.04 <0.02 <0.02 Freon 114 Chloroform Chlorobenzene <0.02 <0.02 <0.02 Vinyl chloride Tetrahydrofuran Ethylbenzene <0.02 <0.02 < Butadiene 1,2-Dichloroethane m,p-xylenes <0.02 <0.02 <0.04 Bromomethane 1,1,1-Trichloroethane Bromoform <0.02 <0.02 <0.02 Chloroethane Benzene Styrene <0.02 <0.02 <0.02 Acrolein Carbon Tetrachloride o-xylene <0.08 <0.02 <0.02 Acetone Cyclohexane 1,1,2,2-Tetrachloroethane <0.80 <0.02 <0.02 Trichlorofluoromethane 1,2-Dichloropropane 4-Ethyltoluene <0.02 <0.02 <0.02 Ethanol Bromodichloromethane 1,3,5-Trimethylbenzene <0.80 <0.02 <0.02 1,1-Dichloroethylene Trichloroethylene 1,2,4-Trimethylbenzene <0.02 <0.02 <0.02 Methylene chloride 1,4-Dioxane 1,3-Dichlorobenzene <0.20 <0.02 <0.02 Freon 113 Methylmethacrylate Benzyl chloride <0.02 <0.02 <0.02 Carbon disulfide Heptane 1,4-Dichlorobenzene <0.02 <0.02 <0.02 t-1,2-dichloroethylene MIBK 1,2-Dichlorobenzene <0.02 <0.02 <0.02 1,1-Dichloroethane c-1,3-dichloropropylene 1,2,4-Trichlorobenzene <0.02 <0.02 <0.04 MTBE t-1,3-dichloropropylene Naphthalene <0.02 <0.02 <0.02 IPA 1,1,2-Trichloroethylene Hexachlorobutadiene <0.80 <0.02 < Butanone (MEK) <0.80 <0.02 c-1,2-dichloroethylene <0.02 <0.02 Toluene 2-Hexanone (MBK) Special Notes: Analyst Initials/Date: WSD 3/3/14 Page 17 of 18 14B0665_1 Contest_Final

53 Air Sampling Media Certificate of Analysis Date Analyzed: 1/30/2014 Batch #: 14CC0056 Certification Type: Batch Certified Individual Certified Media Type: Summa Canister Flow Controllers Media IDs: BC1634 Note:Two ID's grouped together, for example BC2136/BC3145, represents matched pairs of certified summa canisters and flow controllers. Units: PPBv Propene Vinyl acetate Dibromchloromethane <0.80 <0.04 <0.02 Dichlorodifluoromethane Hexane 1,2-Dibromomethane <0.02 <0.80 <0.02 Chloromethane Ethyl acetate Tetrachloroethylene <0.04 <0.02 <0.02 Freon 114 Chloroform Chlorobenzene <0.02 <0.02 <0.02 Vinyl chloride Tetrahydrofuran Ethylbenzene <0.02 <0.02 < Butadiene 1,2-Dichloroethane m,p-xylenes <0.02 <0.02 <0.04 Bromomethane 1,1,1-Trichloroethane Bromoform <0.02 <0.02 <0.02 Chloroethane Benzene Styrene <0.02 <0.02 <0.02 Acrolein Carbon Tetrachloride o-xylene <0.08 <0.02 <0.02 Acetone Cyclohexane 1,1,2,2-Tetrachloroethane <0.80 <0.02 <0.02 Trichlorofluoromethane 1,2-Dichloropropane 4-Ethyltoluene <0.02 <0.02 <0.02 Ethanol Bromodichloromethane 1,3,5-Trimethylbenzene <0.80 <0.02 <0.02 1,1-Dichloroethylene Trichloroethylene 1,2,4-Trimethylbenzene <0.02 <0.02 <0.02 Methylene chloride 1,4-Dioxane 1,3-Dichlorobenzene <0.20 <0.02 <0.02 Freon 113 Methylmethacrylate Benzyl chloride <0.02 <0.02 <0.02 Carbon disulfide Heptane 1,4-Dichlorobenzene <0.02 <0.02 <0.02 t-1,2-dichloroethylene MIBK 1,2-Dichlorobenzene <0.02 <0.02 <0.02 1,1-Dichloroethane c-1,3-dichloropropylene 1,2,4-Trichlorobenzene <0.02 <0.02 <0.04 MTBE t-1,3-dichloropropylene Naphthalene <0.02 <0.02 <0.02 IPA 1,1,2-Trichloroethylene Hexachlorobutadiene <0.80 <0.02 < Butanone (MEK) <0.80 <0.02 c-1,2-dichloroethylene <0.02 <0.02 Toluene 2-Hexanone (MBK) Special Notes: Analyst Initials/Date: WSD 3/3/14 Page 18 of 18 14B0665_1 Contest_Final

54 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK APPENDIX C LABORATORY CERTIFICATION TRC ENGINEERS, INC

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61 VAPOR INTRUSION ASSESSMENT REPORT OF PUBLIC SCHOOL 152Q ND STREET QUEENS, NEW YORK SCA PROJECT ID.: SCA CONTRACT NO.: C SCA SERVICE ID: TRC PROJECT NO.: March 12, 2015 Prepared by: Prepared for: TRC Engineers, Inc Broadway, 10 th Floor NYCSCA Thomson Avenue New York, NY Long Island City, NY Phone: (212) Phone: (718) Fax: (212) Fax: (718) Attn: Mr. Charles Guder Attn: Ms. Lee Guterman

62 VAPOR INTRUSION INVESTIGATION REPORT PS 152Q ND STREET QUEENS, NEW YORK TABLE OF CONTENTS Section Page EXECUTIVE SUMMARY INTRODUCTION BACKGROUND PURPOSE DESCRIPTION OF VI ASSESSMENT FIELD ACTIVITIES VAPOR INTRUSION SAMPLING Building Inspection and Chemical Inventory Indoor and Ambient Air Sampling Sub-Slab Soil Vapor Sampling SITE SETTING SITE DESCRIPTION SITE PHYSICAL CHARACTERISTICS Topography Geology Soils Hydrology DISCUSSION OF FINDINGS APPLICABLE REGULATORY CRITERIA Indoor Air Sampling Guidelines Ambient Air Sampling Guidelines Sub-Slab Soil Vapor Sampling Guidelines INDOOR AIR SAMPLING FINDINGS AMBIENT AIR SAMPLING FINDINGS SUB-SLAB SOIL VAPOR SAMPLING FINDINGS SUMMARY OF FINDINGS CONCLUSIONS AND RECOMMENDATIONS SIGNATURES OF ENVIRONMENTAL PROFESSIONALS REFERENCES TRC ENGINEERS, INC. I

63 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK LIST OF TABLES Table 1 List of Potential Chlorinated Solvent VOCs in Soil Vapor and Ambient Air Table 2 Summary of Results of Analysis of Sub-Slab Soil Vapor, Indoor Air and Ambient Air Samples Figure 1 Site Location Map LIST OF FIGURES Figure 2 Sub-Slab, Indoor Air, and Ambient Air Sample Location Plan APPENDICES APPENDIX A INDOOR AIR QUALITY QUESTIONNAIRE APPENDIX B LABORATORY ANALYTICAL DATA REPORTS APPENDIX C LABORATORY CERTIFICATION TRC ENGINEERS, INC. II

64 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK EXECUTIVE SUMMARY On behalf of the New York City School Construction Authority (NYCSCA), TRC Engineers, Inc. (TRC) conducted a Vapor Intrusion (VI) Assessment at Public School (PS) 152Q located at nd Street, Queens, New York (the Site ). The PS 152Q site is improved with a four-story building with a basement and a roof top fan room, a three-story addition with a basement and an asphalt-paved playground. The basements of both buildings are unoccupied and are comprised of crawl spaces and finished areas containing mechanical equipment, boilers, shops, and storage spaces. An initial VI Assessment was performed at the Site in August 2011 and included the collection and laboratory analysis of three (3) sub-slab soil vapor samples, three (3) indoor air samples and one (1) ambient air sample. The purpose of the initial VI Assessment was to determine if chlorinated volatile organic compounds (VOCs) found in groundwater and soil vapor at an adjacent Brownfield Cleanup Program (BCP) site and in soil vapor near a dry cleaner located on the Site block are present in sub-slab soil vapor and indoor air in the basements of the PS 152Q school building. The purpose of the initial VI Assessment was also to confirm that chlorinated VOCs detected in ambient air during previous investigations (from emissions from the nearby dry cleaner) remain below published background levels. The results of the initial VI Assessment showed that concentrations of VOCs in indoor air samples collected in the basements and in an ambient air sample collected outside the building were below the range of published background concentrations and New York State Department of Health (NYSDOH) Air Guideline Values (AGVs). Although tetrachloroethene (PCE) and trichloroethene (TCE) were detected at elevated concentrations in one sub-slab vapor sample collected in the northeast portion of the basement (blower room) of the original portion of the school building in August 2011, a co-located indoor air sample indicated that vapor intrusion was not occurring. Based on a request from the NYSDOH, a confirmatory VI Assessment was performed in June The results of the confirmatory June 2012 VI Assessment showed that concentrations of VOCs in indoor air samples collected in the basements and in an ambient air sample collected outside the building were below the range of published background concentrations and NYSDOH AGVs. PCE and TCE were again detected at elevated concentrations in one sub-slab vapor sample collected in the northeast portion of the basement (blower room) of the original portion of the school building, the co-located indoor air sample again confirmed that vapor intrusion was not occurring. The results of the confirmatory VI Assessment were presented to the NYSDOH and the NYSDOH agreed that since indoor air has not been impacted by VOCs in sub-slab vapor, monitoring would be acceptable and requested that the NYCSCA perform annual monitoring in the blower room during the heating season. Monitoring, consisting of a VI Assessment, was performed in February 2013 and February The results of the February 2013 and February 2014 VI Assessments were consistent with previous assessments and again confirmed that vapor intrusion was not occurring. The VI Assessment, which is the subject of this report, was performed as part of the annual monitoring in the blower room during the heating season. The scope of the VI Assessment, which was performed on February 13 and 16, 2015, consisted of the collection and analysis of one (1) sub-slab vapor sample and one (1) indoor air sample from the blower room of the school building, and one (1) concurrent, outdoor ambient air sample. TRC ENGINEERS, INC

65 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK Based on the results of this VI Assessment, TRC concludes the following: The concentrations of VOCs detected in indoor and ambient air samples collected as part of this VI Assessment are below the range of published background concentrations and NYSDOH AGVs and are consistent with previous sample results which indicate that vapor intrusion is not occurring. The ambient air sampling results indicate that emissions from the nearby dry cleaner exhaust system are not currently affecting ambient air quality in the vicinity of the school. The sub-slab vapor sampling results indicate that only PCE was detected in sub-slab vapor at a low concentration (1.3 micrograms per cubic meter) which is consistent with the 2014 VI Assessment results. Based on the Decision Matrices, the recommended action for the PCE concentration found in sub-slab soil vapor and indoor air is no further action. Based on the results of the VI Assessment, TRC concludes that the Site building is suitable for continued use as a public school. Additionally, considering that 2014 and 2015 annual monitoring has confirmed that sub-slab PCE concentrations remain low and are decreasing over time, TRC recommends consultation with NYSDOH to discuss eliminating future annual monitoring. TRC ENGINEERS, INC

66 1.0 INTRODUCTION VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK On behalf of the New York School Construction Authority (NYCSCA), TRC Engineers, Inc. (TRC) conducted a Vapor Intrusion (VI) Assessment at the PS 152Q school building located at nd Street, Queens, New York (hereafter referred to as the Site ). The Site location is shown on Figure 1. The VI Assessment was performed in accordance with the New York State Department of Health (NYSDOH) Final Guidance for Evaluating Soil Vapor Intrusion in the State of New York, dated October 2006 ( NYSDOH VI Guidance Document ), and the NYCSCA-approved scope of work, dated November 16, The PS 152Q site is improved with a four-story public school building with a basement and a roof top fan room, a three story addition with a basement and an asphalt-paved playground. The basements of both buildings are unoccupied and are comprised of crawl spaces and finished areas containing mechanical equipment, boilers, shops, and storage spaces. 1.1 Background A Phase I Environmental Site Assessment (ESA) was completed by TRC in January 2011 in support of a proposed new addition to PS 152Q. Of potential relevance in connection with VI, the Phase I ESA revealed the presence of the following recognized environmental conditions (RECs): A Brownfield Cleanup Program (BCP) site (No. C th Street ) at th Street which is approximately 150 feet east-southeast and downgradient of PS 152Q. Historically, the BCP site was occupied by various industrial and/or manufacturing properties and is currently used to store taxi cabs and automobile parts. Previous investigations completed at the BCP site have documented soil, soil vapor, and groundwater contamination primarily consisting of chlorinated volatile organic compounds (VOCs). Specifically, tetrachloroethene (PCE) was detected in soil at concentrations up to 19,600 parts per billion (ppb) and in groundwater at concentrations up to 14,000 ppb. In addition, PCE was detected at a concentration of 42,000 ppb in a monitoring well adjacent to and north of the BCP site. Trichloroethene (TCE) was detected in sub-slab soil vapor downgradient of the BCP site at concentrations up to 814,949 micrograms per cubic meter (µg/m 3 ), and in downgradient groundwater at concentrations up to 633 ppb. Copies of the following six investigation reports related to the BCP Site were included as an Appendix to the NYCSCA s Vapor Intrusion Assessment Report dated December 6, 2011: 1) Phase I Environmental Site Assessment dated February 2005; 2) Phase II Environmental Site Assessment dated April 2005; 3) Remedial Investigation Report and Remedial Investigation/Remedial Action Work Plan dated September 2005; 4) Groundwater Investigation Report dated June 2006; 5) Taxi Storage Yard Investigation Report dated August 2006; and, 6) Draft Remedial Investigation Report dated January A nearby site, Daisy Cleaners / Jong Lee, located on the Site block at nd Street, is an active dry cleaning facility, and is listed in the Registered Dry Cleaners database and Resource Conservation and Recovery Information System Generators/Transporters (RCRIS Gen/Trans) database for the generation of hazardous waste consisting of halogenated solvents. The New York State Department of Environmental Conservation (NYSDEC) performed two soil vapor surveys in the area surrounding the BCP site to determine the nature and extent of off-site soil vapor impacts. On behalf of the NYSDEC, Dvirka & Bartilucci Consulting Engineers, PC (D&B) and AECOM collected soil vapor samples in the sidewalks and right-of-ways on surrounding blocks, including the sidewalk in front of PS 152Q, in October 2006 and February The results of the soil vapor sampling TRC ENGINEERS, INC

67 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK indicated that the highest concentrations of chlorinated VOCs in the vicinity of the school building were at the southern portion of the Site block, near the Daisy Cleaners property. Additionally, PCE was detected in an ambient air sample collected by D&B in front of the original school building in October 2006 at a concentration above published background levels. TRC performed a soil vapor and ambient air quality survey on February 25, The survey consisted of the collection and laboratory analysis of five soil vapor samples and one ambient air quality sample. The soil vapor samples were collected in the 62 nd Street sidewalk adjacent to PS 152Q in locations similar to the locations where D&B and AECOM collected samples. The ambient air sample was collected in front of the main entrance of the school building. The results of the sampling confirmed that the highest concentrations of chlorinated VOCs in soil vapor were at the southern portion of the Site block, near the Daisy Cleaners property. The ambient air sample result also confirmed that PCE was present in ambient air at a concentration above published background levels. The presumed source of the PCE in ambient air was attributed to dry cleaning related discharges from the Daisy Cleaners property. Representatives of the NYCSCA, NYSDOH, and TRC participated in a conference call on April 5, 2011 to discuss available data. During the call, the NYSDOH requested a VI Assessment to determine sub-slab and indoor air concentrations of chlorinated VOCs. The NYCSCA indicated that they were concerned that the elevated levels of PCE in ambient air indicate that there is a contribution from an off-site source (i.e., the Daisy Cleaners) and that this contribution should first be eliminated in order to obtain valid data during the VI Assessment. The NYSDOH agreed to work with their counterparts at the New York City Department of Health and Mental Hygiene (NYCDHMH) and New York City Department of Environmental Protection (NYCDEP) to determine if the nearby dry cleaner (Daisy Cleaners) is complying with air emission regulations. In an dated May 10, 2011, the NYCDEP indicated that the dry cleaner modified their exhaust and measurements of organic vapors at the exhaust point while the equipment was operating measured zero or non-detect. On May 19, 2011, TRC collected two ambient air samples for laboratory analysis to determine ambient air quality in the vicinity of the school. One ambient air sample was collected at street level adjacent to the main school entrance on 62 nd Street and one ambient air sample was collected at roof level near the school addition s heating ventilating and air conditioning (HVAC) fresh air intakes. No VOCs were detected in the two ambient air samples at concentrations above NYSDOH Air Guideline Values (AGVs) or the range of published NYSDOH outdoor background levels. TRC performed an initial VI Assessment in August 2011 to confirm that the chlorinated VOCs identified in ambient air during previous investigations remain below published background levels and to determine if the chlorinated VOCs found in groundwater and soil vapor at the adjacent BCP site and in soil vapor near the dry cleaner on the Site block are present in sub-slab soil vapor and indoor air in the PS 152Q school buildings. The VI Assessment was performed in two phases. The first phase consisted of the collection and analysis of three (3) ambient air quality samples. The second phase consisted of vapor intrusion sampling and was performed following confirmation that ambient air concentrations of chlorinated VOCs were below published background levels. The vapor intrusion sampling included the collection of three (3) sub-slab vapor samples and three (3) indoor air samples from the basement of the school building, and one (1) concurrent, outdoor ambient air sample for laboratory analysis. The results of the initial VI Assessment indicated that emissions from the nearby dry cleaner exhaust system were not affecting ambient air quality in the vicinity of the school and that vapor intrusion was not occurring; however, vapor intrusion mitigation was recommended based on the concentrations of TCE and TRC ENGINEERS, INC

68 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK PCE found in sub-slab soil vapor in one sample collected below the basement in the northeast portion (blower room) of the original portion of the school building. Representatives of the NYCSCA, NYSDOH, and TRC participated in a conference call on May 22, 2012 to discuss the results of the August 2011 VI Assessment. During the conference call, the NYSDOH requested another round of sampling to determine if the PCE and TCE concentrations found in the one subslab vapor sample collected from the northeast portion (blower room) of the original school building were anomalous and to document current concentrations of VOCs in sub-slab soil vapor, indoor, and ambient air. It was agreed that potential future actions would be determined based on the results of the confirmatory VI Assessment. A confirmatory follow-up VI Assessment was performed in June 2012 in response to the NYSDOH s request. The scope of the VI Assessment was consistent with the initial VI Assessment performed in August The VI Assessment consisted of the collection and analysis of three (3) sub-slab vapor samples and three (3) indoor air samples from the basements of the school buildings, and one (1) concurrent, outdoor ambient air sample. The results of the confirmatory VI Assessment indicated that concentrations of VOCs in indoor air samples collected in the basements and in an ambient air sample collected outside the building were below the range of published background concentrations and NYSDOH AGVs; however, PCE and TCE were again detected at elevated concentrations in one sub-slab vapor sample collected in the northeast portion (blower room) of the basement of the original portion of the school building. The concentrations of PCE and TCE detected in this sub-slab vapor sample were compared to the Decision Matrices in the NYSDOH VI Guidance Document. Although mitigation was the recommended action (based on the Decision Matrices), the concentrations of PCE and TCE detected in a co-located indoor air sample indicated that vapor intrusion was not occurring. Representatives of the NYCSCA, NYSDOH, and TRC participated in a conference call on October 4, 2012 to discuss the results of the June 2012 VI Assessment. Based on the results of the initial and follow-up VI Assessments, the NYSDOH agreed that vapor intrusion was not occurring. The NYSDOH recommended that annual monitoring during the heating season should be performed in the blower room of the basement. The NYSDOH also recommended installation of a permanent sub-slab vapor monitoring point, the collection and laboratory analysis of sub-slab soil vapor and indoor air samples from the blower room, and the collection and laboratory analysis of an ambient air sample from outside the school building. VI Assessments were performed in February 2013 and February 2014 consistent with NYSDOH recommendations. The results of the VI Assessments indicated that the results were consistent with previous assessments and vapor intrusion was not occurring. TRC understands that the BCP site is not currently under remediation; however, the remedial investigation is complete and remediation work is anticipated to begin by the end of Purpose This VI Assessment was performed to comply with the NYSDOH s recommendation to document current concentrations of PCE and its degradation compounds (TCE, cis-1,2-dichloroethene, trans-1,2- dichloroethene, and vinyl chloride) in sub-slab soil vapor and indoor air in the basement blower room during the heating season and to document current concentrations of PCE and its degradation compounds in ambient air outside the school building. The VI Assessment consisted of the collection of one (1) sub-slab TRC ENGINEERS, INC

69 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK vapor sample and one (1) indoor air sample from the basement blower room of the school building, and one (1) concurrent, outdoor ambient air sample for laboratory analysis. TRC ENGINEERS, INC

70 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK DESCRIPTION OF VI ASSESSMENT FIELD ACTIVITIES VI Assessment field activities were performed between February 13 and 16, 2015 in accordance with the NYCSCA-approved scope of work dated November 2012, and included the following: A pre-sampling building inspection and chemical inventory; Collection and analysis of one (1) 8-hour duration, sub-slab vapor sample from the permanent subslab soil vapor probe installed in the basement blower room of the original PS 152Q school building; Collection and analysis of one (1) 8-hour duration, indoor air sample in the basement blower room of the PS 152Q school building concurrent with the sub-slab vapor sampling; and, Collection and analysis of one (1) 8-hour duration, ambient air sample from outside of the PS 152Q school building concurrent with the indoor air sampling. Figures showing Site features and the sampling locations are provided as Figures 1 and 2. The field activities and methods are described further below. 2.1 Vapor Intrusion Sampling Building Inspection and Chemical Inventory A pre-sampling chemical inventory was conducted of the indoor air sample locations and adjacent spaces to determine if materials with the potential to affect indoor air quality were present (e.g., cleaning supplies, etc.). The pre-sampling chemical inventory was completed on February 13, The completed presampling chemical inventory form is provided as Appendix A. The basements of the school were inspected for cracks, penetrations, and other preferential pathways for soil vapor intrusion such as floor drains and sumps. Floor cracks were not identified in the subsurface walls or floors. Floor drains are present in the boiler and blower rooms; sumps are present in the boiler room. During the inspection a ppbrae photoionization detector (PID) capable of detecting VOCs in the parts per billion (ppb) range was utilized to screen indoor air for the presence of organic vapors. PID readings ranged from 0 to 30 ppb in the sampling area and no interfering conditions were identified. Confirmatory PID readings were taken prior to sampling on February 16, 2015 and did not exceed 0 ppb throughout the sampling area Indoor and Ambient Air Sampling The indoor air and ambient air sampling was conducted on February 16, 2015 in general accordance with the applicable procedures described in the NYSDOH VI Guidance Document. One (1) indoor air sample and one (1) ambient air sample were collected and submitted for laboratory analysis. Figure 2 shows the sampling locations. The samples were collected for laboratory analysis of VOCs as follows: Indoor air sample TRC IA was collected in the northeastern portion of the main school building basement in the blower room; and TRC ENGINEERS, INC

71 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK Ambient air sample TRC AA was collected from outside the main school building entrance at street level. The one (1) indoor air and one (1) ambient air samples were collected utilizing individually certified-clean 6-liter Summa canisters. The samples were collected for approximately eight (8) hours. The indoor and ambient air samples were collected at a height of approximately 3 to 5 feet to simulate a typical breathing zone. Immediately after opening each Summa canister, the initial vacuum (inches of mercury) in each canister was recorded as shown in the table below. After approximately eight hours, final vacuum readings (inches of mercury [Hg]) were noted and the Summa canisters were closed. All samples were collected concurrently. Summary of Sampling Field Data Canister Vacuum at Start (Inches Hg) Canister Vacuum at Completion (Inches Hg) Sample ID TRC IA TRC AA 29 8 The indoor air and ambient air samples were analyzed for the following VOCs utilizing United States Environmental Protection Agency (USEPA) Method TO-15: cis-1,2-dichloroethene, trans-1,2- dichloroethene, PCE, TCE and vinyl chloride. These VOCs were selected to include PCE and its degradation byproducts, which are the contaminants of concern identified during previous investigations. Refer to the attached Table 1 for a description of these compounds. The samples were collected for approximately eight (8) hours, in order to obtain a sufficient sample volume for a laboratory reporting limit of approximately 1.0 micrograms per cubic meter (µg/m 3 ) for the analytes. Additionally, in accordance with the NYSDOH VI Guidance Document, a reporting limit of less than 0.25 µg/m 3 was achieved for vinyl chloride and TCE. The Summa canisters were properly labeled and shipped via Federal Express to Con-Test of East Longmeadow, Massachusetts for analysis. Con-Test is a NYSDOH Environmental Laboratory Approval Program (ELAP) certified analytical laboratory for air quality sample analyses. A summary of the analytical results is presented in Table 2. The laboratory analytical data report is in Appendix B Sub-Slab Soil Vapor Sampling The sub-slab soil vapor sampling was conducted on February 16, 2015 in general accordance with the applicable procedures described in the NYSDOH VI Guidance Document. One (1) sub-slab soil vapor sample was collected and submitted for laboratory analysis. Sub-slab soil vapor sample was collected concurrently with the indoor and ambient air samples collected as described in Section Figure 2 shows the sampling locations. The samples were collected for laboratory analysis of VOCs as follows: Sub-slab soil vapor sample TRC SV was collected in the northeastern portion of the main school building basement in the blower room. TRC ENGINEERS, INC

72 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK The sub-slab soil vapor sample was collected immediately below the building basement floor slab surface (i.e., less than 1 foot below the top of the basement floor slab) from a permanent sub-slab vapor probe previously installed by inserting polyethylene tubing to a depth immediately below the building floor slab and sealing the annular space with cement and hydrated bentonite. The adequacy of the seal was tested prior to sampling in accordance with the NYSDOH-approved method for vapor sampling using a 5-gallon bucket or cardboard box placed over the permanent vapor probe. Helium tracer gas was then pumped into the bucket/box. The above grade end of the tubing, which is the sample collection point, was then attached to a helium gas detector. The adequacy of the seal was verified by direct helium readings of less than 10 percent. The sub-slab soil vapor sample was collected utilizing individually certified-clean 6-liter Summa canisters. The sample was collected for approximately eight (8) hours. The sub-slab vapor sample was collected by connecting the polyethylene tubing directly to the Summa canisters. Immediately after opening each Summa canister, the initial vacuum (inches of mercury) in each canister was recorded as shown in the table below. After approximately eight hours, final vacuum readings (inches of mercury) were noted and the Summa canisters were closed. Summary of Sampling Field Data Sample ID Canister Vacuum at Start (Inches Hg) Canister Vacuum at Completion (Inches Hg) TRC SV The sub-slab soil vapor samples were analyzed for the following VOCs utilizing USEPA Method TO-15: cis-1,2-dichloroethene, trans-1,2-dichloroethene, PCE, TCE and vinyl chloride. These VOCs were selected to include PCE and its degradation byproducts, which are the contaminants of concern identified during previous investigations. Refer to the attached Table 1 for a description of these compounds. The sample was collected for approximately eight (8) hours, in order to obtain a sufficient sample volume for a laboratory reporting limit of approximately 1.0 µg/m 3 for the analytes. The Summa canister was properly labeled and shipped via Federal Express to Con-Test of East Longmeadow, Massachusetts for analysis. Con-Test is a NYSDOH Environmental Laboratory Approval Program (ELAP) certified analytical laboratory for air quality sample analyses. A summary of the analytical results is presented in Table 2. The laboratory analytical data report is in Appendix B. Upon completion of sampling at the permanent sub-slab soil vapor point, the tubing was capped for future sampling events. TRC ENGINEERS, INC

73 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK SITE SETTING 3.1 Site Description PS 152Q is located at nd Street, Queens, NY The site of PS 152Q is improved with a fourstory building with a basement and a roof top fan room, a three-story addition with a basement and an asphalt-paved playground. The basements of both buildings are unoccupied and comprised of crawl spaces and finished areas containing mechanical equipment, boilers, shops, and storage spaces. A Site location map is shown on Figure 1 and sampling locations are shown on Figure Site Physical Characteristics Information regarding topography, geology, site soils, and hydrology was obtained from previous site investigations and assessments and is summarized below Topography Based on field observations, the topography of the Site slopes downward slightly from west to the east. The topography of the surrounding area generally slopes downward from southwest to northeast. According to the United States Geological Survey (USGS) 7.5-Minute Quadrangle Map (Central Park, NY 1995), the elevation of the Site property is approximately 37 feet above mean sea level (amsl) Geology The geology of Queens County consists of unconsolidated glacial deposits overlying crystalline bedrock. Based on available literature (Buxton, Soren, Posner, and Shernoff, 1981), the subsurface geology of the Site likely includes the following formations: Pleistocene upper glacial deposits, Gardiners Clay, Jameco Gravel, Cretaceous Raritan Formation consisting of sands and clays, and crystalline bedrock. The depth to crystalline bedrock for the area is estimated to be approximately 120 feet below ground surface (bgs) Soils According to the U.S. Department of Agriculture (USDA) Soil Conservation Service (SCS) STATSGO data, soil in the area of the Site is described as Urban Land. Urban Land refers to soils that have been altered by human activities thus making them unidentifiable. Typically, these soils have been mixed with other materials, such as brick and concrete (urban fill), and characteristics can only be determined by onsite investigation Hydrology The Site is located approximately 1.75 miles south of Bowery Bay and approximately 2.25 miles northeast of Maspeth Creek, an extension of the East River. Based on topography in the area, the assumed hydraulic gradient direction is towards the northeast. TRC ENGINEERS, INC

74 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK Based on depth to groundwater measured on June 6, 2012 from groundwater monitoring wells installed to verify the groundwater elevation at the Site, the groundwater surface is approximately 11 feet below sidewalk grade. TRC ENGINEERS, INC

75 4.0 DISCUSSION OF FINDINGS VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK This section presents a discussion of the findings of the VI Assessment. 4.1 Applicable Regulatory Criteria This subsection identifies the regulatory criteria used to evaluate the results of the sub-slab, indoor, and ambient air samples. The standards and guidelines used to evaluate the specific data are described individually below Indoor Air Sampling Guidelines The analytical results for the indoor air samples were compared to the NYSDOH AGVs presented in the NYSDOH VI Guidance Document and the NYSDOH September 2013 Tetrachloroethene in Indoor and Outdoor Air Fact Sheet. Analytical results for the indoor air samples were also compared to background levels of VOCs in indoor air presented in Appendix C of the NYSDOH VI Guidance Document, including: Upper Fence Limit indoor air values from Table C-1. NYSDOH 2003: Study of Volatile Organic Chemicals in Air of Fuel Oil Heated Homes; 90 th Percentile indoor air values from Table C-2. EPA 2001: Building Assessment and Survey Evaluation (BASE) Database, SUMMA canister method; and, the 95 th Percentile Indoor Air Values from Table C-5. HEI 2005: Relationship of Indoor, Outdoor and Personal Air. In addition, the results were compared to the 95th Percentile Concentrations in Existing Residences published in Appendix X7 of ASTM E Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate Transactions Ambient Air Sampling Guidelines Analytical results for the ambient air sample were compared to the NYSDOH AGVs presented in the NYSDOH VI Guidance Document and the NYSDOH September 2013 Tetrachloroethene in Indoor and Outdoor Air Fact Sheet. Additionally, analytical results were also compared to background levels of VOCs in outdoor air presented in Appendix C of the NYSDOH VI Guidance Document, including: Upper Fence Limit outdoor air values from Table C-1. NYSDOH 2003: Study of Volatile Organic Chemicals in Air of Fuel Oil Heated Homes; 90 th Percentile outdoor air values from Table C-2. EPA 2001: BASE Database, SUMMA canister method; and, the 95 th Percentile Outdoor Air Values from Table C-5, HEI 2005: Relationship of Indoor, Outdoor and Personal Air Sub-Slab Soil Vapor Sampling Guidelines The results of analyses of the sub-slab vapor samples were compared to the NYSDOH AGVs and to background levels of VOCs in indoor air presented in Appendix C of the NYSDOH VI Guidance Document, including: Upper Fence Limit indoor air values from Table C-1. NYSDOH 2003: Study of Volatile Organic Chemicals in Air of Fuel Oil Heated Homes, 90 th Percentile indoor air values from Table C-2. EPA 2001: BASE Database, SUMMA canister method, and the 95 th Percentile Indoor Air Values from Table C-5, HEI 2005: Relationship of Indoor, Outdoor and Personal Air. In addition, the results were compared to the 95th Percentile Concentrations in Existing Residences published in Appendix X7 of ASTM E Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate Transactions. TRC ENGINEERS, INC

76 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK Finally, sub-slab soil vapor and indoor air sampling results were compared to the Decision Matrices in the NYSDOH VI Guidance Document. A comparison of these results using the Decision Matrices indicates whether or not vapor intrusion is occurring (or is likely to occur) and provides the NYSDOH s recommended actions (e.g., monitoring, mitigation, etc.). 4.2 Indoor Air Sampling Findings The NYSDOH has established AGVs for two (2) of the VOCs (PCE and TCE) analyzed in the indoor air sample. A summary of the indoor air sampling results compared to their respective AGVs is as follows: PCE was detected in the indoor air sample at a concentration of 0.89 µg/m 3 which is below the AGV of 30 µg/m 3. TCE was not detected in the indoor air sample. A review of the results of the indoor air sampling indicates that one (PCE) of the five VOCs analyzed was detected in the indoor air sample. There were no VOCs detected above the range of anticipated indoor background levels. The indoor air sampling results are consistent with the indoor air sampling results from previous vapor intrusion investigations performed at the Site. The attached Table 2 presents the comparison of the historic and current sampling data. The complete laboratory analytical data report for the current sampling round is included in Appendix B. 4.3 Ambient Air Sampling Findings The NYSDOH has established AGVs for two (2) of the VOCs (PCE and TCE) analyzed in the ambient air sample. A summary of the ambient air sampling results compared to their respective AGVs are as follows: PCE was detected in the ambient air sample at 0.24 µg/m 3 which is below the AGV of 30 µg/m 3. TCE was not detected in the ambient air sample. A review of the results of the ambient air sampling indicates that one (PCE) of the five VOCs analyzed was detected in the ambient air sample. There were no VOCs detected above the range of anticipated outdoor background levels. The ambient air sampling results indicate that the results are consistent with previous VI Assessments performed at the Site and also that emissions from the nearby dry cleaner exhaust system are not currently affecting ambient air quality in the vicinity of the school. The attached Table 2 presents the comparison of the historic and current sampling data. The complete laboratory analytical data report for the current sampling round is included in Appendix B. TRC ENGINEERS, INC

77 4.4 Sub-Slab Soil Vapor Sampling Findings VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK The NYSDOH has established AGVs for two (2) of the VOCs (PCE and TCE) analyzed in the sub-slab vapor sample. A summary of the sub-slab soil vapor sampling results compared to their respective AGVs are as follows: PCE was detected in the sub-slab vapor sample at 1.3 µg/m 3 which is below the AGV of 30 µg/m 3. TCE was not detected in the sub-slab vapor sample. Sub-slab soil vapor and indoor air sampling results for PCE were compared to Matrix 2 of the NYSDOH VI Guidance Document. Based on the Decision Matrices, the recommended action for the PCE concentration found in sub-slab soil vapor and indoor air is no further action. The concentration of PCE found in sub-slab soil vapor is consistent with the sub-slab sampling results for the blower room collected in 2014 and significantly lower than sub-slab sampling results for the blower room collected between 2011 and 2013 (PCE concentrations historically ranged from 740 to 2,900 µg/m 3 ). Additionally, TCE was not detected during the current sampling round which is also consistent with the sub-slab sampling results for the blower room collected in 2014 (previous sub-slab sampling results collected between 2011 and 2013 ranged from 390 to 880 µg/m 3 ). The decrease in PCE and TCE concentrations may be attributable to variabilities in sub-slab conditions and degradation, dilution, and dispersion of these compounds over time. The attached Table 2 presents the comparison of the historic and current sampling data. The complete laboratory analytical data report for the February 2015 sampling is included in Appendix B. 4.5 Summary of Findings On February 13 and 16, 2015, TRC performed a building inspection, chemical inventory, and collected one (1) indoor air, one (1) ambient air, and one (1) sub-slab soil vapor sample for laboratory analysis. There were no interfering conditions noted during sampling. The laboratory analytical results indicate that no VOCs were detected in the indoor or ambient air samples at concentrations above the corresponding NYSDOH AGVs or above the range of anticipated background levels. Ambient air sampling results indicate that emissions from the nearby dry cleaner exhaust system are not currently affecting ambient air quality in the vicinity of the school. A comparison of sub-slab vapor sampling results to indoor air sampling results to the Decision Matrices indicates that no further action is recommended. A comparison of the current data to the results from the most recent VI Assessment performed in 2014 confirm that sub-slab vapor concentrations remain low. Additionally, the co-located indoor air sample results confirm that vapor intrusion is not occurring. TRC ENGINEERS, INC

78 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK CONCLUSIONS AND RECOMMENDATIONS Based on the results of this VI Assessment, TRC concludes the following: The concentrations of VOCs detected in indoor and ambient air samples collected as part of this VI Assessment are below the range of published background concentrations and NYSDOH AGVs and are consistent with previous sample results which indicate that vapor intrusion is not occurring. The ambient air sampling results indicate that emissions from the nearby dry cleaner exhaust system are not currently affecting ambient air quality in the vicinity of the school. The sub-slab vapor sampling results indicate that only PCE was detected in sub-slab vapor at a low concentration (1.3 micrograms per cubic meter) which is consistent with the 2014 VI Assessment results. Based on the Decision Matrices, the recommended action for the PCE concentration found in sub-slab soil vapor and indoor air is no further action. Based on the results of the VI Assessment, TRC concludes that the Site building is suitable for continued use as a public school. Additionally, considering that the 2014 and 2015 annual monitoring has confirmed that sub-slab PCE concentrations remain low and are decreasing over time, TRC recommends consultation with NYSDOH to discuss eliminating future annual monitoring. TRC ENGINEERS, INC

79 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK SIGNATURES OF ENVIRONMENTAL PROFESSIONALS TRC Engineers, Inc. (TRC) has performed a VI Assessment for Public School 152Q located at nd Street, Queens, New York The VI Assessment was performed in general accordance with the NYCSCA-approved scope of work dated November 16, 2012, as indicated in Section 2.0. TRC Engineers, Inc. Prepared By: Daniel Schmidt Junior Engineer Reviewed By: Charles Guder Senior Project Manager (QC Officer) TRC ENGINEERS, INC

80 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK REFERENCES American Society for Testing and Materials, ASTM E , Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate Transactions. Buxton, Herbert, Soren, Julian, Posner Alex, and Shernoff, Peter, Reconnaissance of the Ground- Water Resources of Kings and Queens Counties, New York., 1981 New York State Department of Health, Center for Environmental Health, Bureau of Environmental Exposure Investigation, Guidance for Evaluating Soil Vapor Intrusion in the State of New York, October New York State Department of Health, Tetrachloroethene (Perc) in Indoor and Outdoor Air, September 2013 Fact Sheet TRC Phase I Environmental Site Assessment Report, Proposed Addition to Public School 152Q, Northern Boulevard and to Northern Boulevard, Queens, New York, 11377, January 2011 TRC Vapor Intrusion Assessment Report, PS 152Q, nd Street, Queens, NY 11377, December TRC Vapor Intrusion Assessment Report, PS 152Q, nd Street, Queens, NY 11377, July TRC Vapor Intrusion Assessment Report, PS 152Q, nd Street, Queens, NY 11377, February TRC Vapor Intrusion Assessment Report, PS 152Q, nd Street, Queens, NY 11377, March TRC Vapor Intrusion Monitoring Scope of Work and Proposal, PS 152Q, nd Street, Queens, NY 11377, November USGS Fact Sheet , Water-Table Configuration in Kings and Queens Counties, New York March TRC ENGINEERS, INC

81 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK FIGURES TRC ENGINEERS, INC

82 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK Figure 1 Site Location Map TRC ENGINEERS, INC

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84 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK Figure 2 Sub-Slab, Indoor Air, and Ambient Air Sample Location Plan TRC ENGINEERS, INC

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86 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK TABLES TRC ENGINEERS, INC

87 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK TABLE 1 LIST OF POTENTIAL CHLORINATED SOLVENT VOCS IN SOIL VAPOR AND AMBIENT AIR The following suite of 5 volatile organic compounds (VOCs) parameters has been selected from the TO-15 expanded list based on the results of previous investigations: 1. The compounds are listed in TO-15, 2. The compounds are associated with potential soil vapor concerns associated with dry cleaner solvent management or auto repair facilities, and 3. The VOCs are analyzed by NYSDEC at ambient VOC monitoring stations in New York City. Compound Rationale for Including in Parameter Suite 1 cis-1,2-dichloroethene Breakdown product of PCE and TCE 2 trans-1,2-dichloroethene Breakdown product of PCE and TCE 3 Tetrachloroethene (PCE) Dry cleaning solvent 4 Trichloroethene (TCE) Solvent, Breakdown product of PCE 5 Vinyl Chloride Breakdown product of PCE & TCE TRC ENGINEERS, INC

88 Table 2 Summary of Results of Analysis of Indoor Air, Sub-Slab Soil Vapor and Ambient Air Samples Volatile Organic Compounds PS 152Q Main School Building nd Street Queens, New York SAMPLE LOCATION SAMPLE NAME TRC-IA-3 TRC-IA-3 TRC IA-01 TRC IA-01 TRC IA TRC-SSSV-3 TRC-SSSV-3 TRC SV- 01 TRC SV- 01 TRC SV TRC-AA TRC-AA TRC-AA TRC-AA TRC AA LAB ID NO. 11H F B B B H F B B B H F B B B DATE SAMPLE COLLECTED 8/16/2011 6/7/2012 2/18/2013 2/21/2014 2/16/2015 8/16/2011 6/7/2012 2/18/2013 2/21/2014 2/16/2015 8/16/2011 6/7/2012 2/18/2013 2/21/2014 2/16/2015 Indoor Outdoor Indoor Outdoor Indoor Outdoor Indoor COMPOUND (µg/m 3 ) (µg/m3) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m3) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m3) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) (µg/m 3 ) cis-1,2-dichloroethene <0.16 <0.14 <0.14 <0.14 <0.14 <0.40 <0.40 <0.40 <0.40 <0.40 <0.16 <0.14 <0.14 <0.14 < <1.8 < trans-1,2-dichloroethene <0.16 <0.14 <0.14 <0.14 <0.14 <0.40 <0.40 <0.40 <0.40 <0.40 <0.16 <0.14 <0.14 <0.14 < Tetrachloroethene (PCE) Trichloroethene (TCE) < <0.54 <0.54 <0.21 <0.19 <0.19 <0.19 < Vinyl chloride <0.10 <0.090 <0.090 <0.090 <0.090 <0.26 <0.26 <0.26 <0.26 <0.26 <0.10 <0.090 <0.090 <0.090 < <1.8 < Notes: µg/m 3 = micrograms per cubic meter < - Less than reporting limit Indoor air results shown in bold font and shading equal or exceed the range of published background indoor air concentrations. -- = Not Available AGV - Air Guideline Value NYSDOH - New York State Department of Health BASE - Building Assessment and Survey Evaluation HEI RIOPA - Health Effect Institute: Relationship of Indoor, Outdoor and Personal Air (1) - From ASTM E "Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate Transactions", Appendix X7 (2) - Per Appendix C of the Final NYSDOH Guidance. Indoor Air Basement - Blower Room Sub-Slab Soil Vapor Basement - Blower Room Ambient Air Outside School Building NYSDOH AGV ASTM E 2600 Concentration in Existing Residences - 95th Percentile (1) NYSDOH Fuel Oil 2003 Upper Fence Limit (2) USEPA BASE Data 90th Percentile Value (2) HEI RIOPA th Percentile Value (2) TRC Engineers, Inc. 3/6/2015

89 VAPOR INTRUSION ASSESSMENT REPORT PS 152Q nd STREET QUEENS, NEW YORK APPENDIX A INDOOR AIR QUALITY QUESTIONNAIRE TRC ENGINEERS, INC

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99 Table of Contents 39 Spruce Street * East Longmeadow, MA * FAX 413/ * TEL. 413/ February 25, 2015 Dan Schmidt TRC Environmental Corporation - NY 1430 Broadway 10th Floor New York, NY Project Location: 152Q Client Job Number: Project Number: Laboratory Work Order Number: 15B0598 Enclosed are results of analyses for samples received by the laboratory on February 18, If you have any questions concerning this report, please feel free to contact me. Sincerely, Meghan E. Kelley Project Manager Page 1 of 19 15B0598_2 Contest_Final /25/15 17:04:29

100 Table of Contents Table of Contents Sample Summary 3 Case Narrative 4 Sample Results 5 Sample Preparation Information 8 QC Data 9 Air Toxics by EPA Compendium Methods 9 B Flag/Qualifier Summary 10 Certifications 11 Chain of Custody/Sample Receipt 12 Page 2 of 19 15B0598_2 Contest_Final /25/15 17:04:29

101 Table of Contents TRC Environmental Corporation - NY 1430 Broadway 10th Floor New York, NY ATTN: Dan Schmidt 39 Spruce Street * East Longmeadow, MA * FAX 413/ * TEL. 413/ PURCHASE ORDER NUMBER: C [TOC_1]Sample Summary[TOC] REPORT DATE: 2/25/2015 PROJECT NUMBER: ANALYTICAL SUMMARY WORK ORDER NUMBER: 15B0598 The results of analyses performed on the following samples submitted to the CON-TEST Analytical Laboratory are found in this report. PROJECT LOCATION: 152Q FIELD SAMPLE # LAB ID: MATRIX SAMPLE DESCRIPTION TEST SUB LAB TRC SV 15B Sub Slab EPA TO-15 TRC IA 15B Indoor air EPA TO-15 TRC AA 15B Ambient Air EPA TO-15 Page 3 of 19 15B0598_2 Contest_Final /25/15 17:04:29

102 Table of Contents 39 Spruce Street * East Longmeadow, MA * FAX 413/ * TEL. 413/ [TOC_1]Case Narrative[TOC] CASE NARRATIVE SUMMARY All reported results are within defined laboratory quality control objectives unless listed below or otherwise qualified in this report. The results of analyses reported only relate to samples submitted to the Con-Test Analytical Laboratory for testing. I certify that the analyses listed above, unless specifically listed as subcontracted, if any, were performed under my direction according to the approved methodologies listed in this document, and that based upon my inquiry of those individuals immediately responsible for obtaining the information, the material contained in this report is, to the best of my knowledge and belief, accurate and complete. Johanna K. Harrington Manager, Laboratory Reporting Page 4 of 19 15B0598_2 Contest_Final /25/15 17:04:29

103 Table of Contents 39 Spruce Street * East Longmeadow, MA * FAX 413/ * TEL. 413/ [TOC_1]Sample Results[TOC] ANALYTICAL RESULTS Project Location: 152Q Date Received: 2/18/2015 Field Sample #: TRC SV Sample ID: 15B Sample Matrix: Sub Slab Sampled: 2/16/ :35 Sample Description/Location: Sub Description/Location: Canister ID: 2193 Canister Size: 6 liter Flow Controller ID: 3306 Sample Type: 8 hr Work Order: 15B0598 Initial Vacuum(in Hg): -30 Final Vacuum(in Hg): -10 Receipt Vacuum(in Hg): -10 Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: <20% EPA TO-15 ppbv ug/m3 Date/Time Analyte Results RL Flag/Qual Results RL Dilution Analyzed Analyst cis-1,2-dichloroethylene ND 0.10 ND /21/15 10:37 TPH trans-1,2-dichloroethylene ND 0.10 ND /21/15 10:37 TPH Tetrachloroethylene /21/15 10:37 TPH Trichloroethylene ND 0.10 ND /21/15 10:37 TPH Vinyl Chloride ND 0.10 ND /21/15 10:37 TPH Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1) /21/15 10:37 Page 5 of 19 15B0598_2 Contest_Final /25/15 17:04:29

104 Table of Contents 39 Spruce Street * East Longmeadow, MA * FAX 413/ * TEL. 413/ ANALYTICAL RESULTS Project Location: 152Q Date Received: 2/18/2015 Field Sample #: TRC IA Sample ID: 15B Sample Matrix: Indoor air Sampled: 2/16/ :36 Sample Description/Location: Sub Description/Location: Canister ID: 2136 Canister Size: 6 liter Flow Controller ID: 3589 Sample Type: 8 hr Work Order: 15B0598 Initial Vacuum(in Hg): -29 Final Vacuum(in Hg): -10 Receipt Vacuum(in Hg): Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: <20% EPA TO-15 ppbv ug/m3 Date/Time Analyte Results RL Flag/Qual Results RL Dilution Analyzed Analyst cis-1,2-dichloroethylene ND ND /21/15 9:24 TPH trans-1,2-dichloroethylene ND ND /21/15 9:24 TPH Tetrachloroethylene /21/15 9:24 TPH Trichloroethylene ND ND /21/15 9:24 TPH Vinyl Chloride ND ND /21/15 9:24 TPH Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1) /21/15 9:24 Page 6 of 19 15B0598_2 Contest_Final /25/15 17:04:29

105 Table of Contents 39 Spruce Street * East Longmeadow, MA * FAX 413/ * TEL. 413/ ANALYTICAL RESULTS Project Location: 152Q Date Received: 2/18/2015 Field Sample #: TRC AA Sample ID: 15B Sample Matrix: Ambient Air Sampled: 2/16/ :40 Sample Description/Location: Sub Description/Location: Canister ID: 1117 Canister Size: 6 liter Flow Controller ID: 3588 Sample Type: 8 hr Work Order: 15B0598 Initial Vacuum(in Hg): -29 Final Vacuum(in Hg): -8 Receipt Vacuum(in Hg): -6.5 Flow Controller Type: Fixed-Orifice Flow Controller Calibration RPD Pre and Post-Sampling: <20% EPA TO-15 ppbv ug/m3 Date/Time Analyte Results RL Flag/Qual Results RL Dilution Analyzed Analyst cis-1,2-dichloroethylene ND ND /21/15 8:39 TPH trans-1,2-dichloroethylene ND ND /21/15 8:39 TPH Tetrachloroethylene /21/15 8:39 TPH Trichloroethylene ND ND /21/15 8:39 TPH Vinyl Chloride ND ND /21/15 8:39 TPH Surrogates % Recovery % REC Limits 4-Bromofluorobenzene (1) /21/15 8:39 Page 7 of 19 15B0598_2 Contest_Final /25/15 17:04:29

106 Table of Contents 39 Spruce Street * East Longmeadow, MA * FAX 413/ * TEL. 413/ Sample Extraction Data [TOC_1]Sample Preparation Information[TOC] Prep Method: TO-15 Prep-EPA TO-15 Pre-Dil Pre-Dil Default Actual Lab Number [Field ID] Batch Pressure Dilution Pre Dilution Initial ml Final ml Injection ml Injection ml Date 15B [TRC SV] B N/A /20/15 15B [TRC IA] B N/A /20/15 15B [TRC AA] B N/A /20/15 Page 8 of 19 15B0598_2 Contest_Final /25/15 17:04:29

107 Table of Contents 39 Spruce Street * East Longmeadow, MA * FAX 413/ * TEL. 413/ QUALITY CONTROL Air Toxics by EPA Compendium Methods - Quality Control [TOC_1]QC Data[TOC] [TOC_2]Air Toxics by EPA Compendium Methods[TOC] Analyte ppbv ug/m3 Spike Level Results RL Results RL ppbv Source Result %REC %REC Limits RPD RPD Limit Flag/Qual Batch B TO-15 Prep [TOC_3]B115775[TOC] Blank (B BLK1) Prepared & Analyzed: 02/20/15 cis-1,2-dichloroethylene trans-1,2-dichloroethylene Tetrachloroethylene Trichloroethylene Vinyl Chloride ND ND ND ND ND Surrogate: 4-Bromofluorobenzene (1) LCS (B BS1) Prepared & Analyzed: 02/20/15 cis-1,2-dichloroethylene trans-1,2-dichloroethylene Tetrachloroethylene Trichloroethylene Vinyl Chloride Surrogate: 4-Bromofluorobenzene (1) Page 9 of 19 15B0598_2 Contest_Final /25/15 17:04:29

108 Table of Contents 39 Spruce Street * East Longmeadow, MA * FAX 413/ * TEL. 413/ FLAG/QUALIFIER SUMMARY [TOC_1]Flag/Qualifier Summary[TOC] * QC result is outside of established limits. Wide recovery limits established for difficult compound. Wide RPD limits established for difficult compound. # Data exceeded client recommended or regulatory level Percent recoveries and relative percent differences (RPDs) are determined by the software using values in the calculation which have not been rounded. No results have been blank subtracted unless specified in the case narrative section. Page 10 of 19 15B0598_2 Contest_Final /25/15 17:04:29

109 Table of Contents Certified Analyses included in this Report Analyte EPA TO-15 in Air cis-1,2-dichloroethylene trans-1,2-dichloroethylene Tetrachloroethylene Trichloroethylene Vinyl Chloride 39 Spruce Street * East Longmeadow, MA * FAX 413/ * TEL. 413/ CERTIFICATIONS Certifications AIHA,FL,NY,VA,ME AIHA,NJ,NY,VA,ME AIHA,FL,NJ,NY,VA,ME AIHA,FL,NJ,NY,VA,ME AIHA,FL,NJ,NY,VA,ME [TOC_1]Certifications[TOC] The CON-TEST Environmental Laboratory operates under the following certifications and accreditations: Code Description Number Expires AIHA AIHA-LAP, LLC /1/2016 MA Massachusetts DEP M-MA100 06/30/2015 CT Connecticut Department of Publilc Health PH /30/2015 NY New York State Department of Health NELAP 04/1/2015 NH-S New Hampshire Environmental Lab 2516 NELAP 02/5/2016 RI Rhode Island Department of Health LAO /30/2015 NC North Carolina Div. of Water Quality /31/2015 NJ New Jersey DEP MA007 NELAP 06/30/2015 FL Florida Department of Health E NELAP 06/30/2015 VT Vermont Department of Health Lead Laboratory LL /30/2015 WA State of Washington Department of Ecology C /23/2016 ME State of Maine /9/2015 VA Commonwealth of Virginia /14/2015 NH-P New Hampshire Environmental Lab 2557 NELAP 09/6/2015 Page 11 of 19 15B0598_2 Contest_Final /25/15 17:04:29

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115 Table of Contents Air Sampling Media Certificate of Analysis Date Analyzed: 1/15/2015 Batch #: B D Certification Type: Batch Certified Individual Certified Media Type: Summa Canister Flow Controllers Media IDs: BC1117 Note:Two ID's grouped together, for example BC2136/BC3145, represents matched pairs of certified summa canisters and flow controllers. Units: PPBv <0.80 <0.04 <0.02 <0.02 <0.20 <0.02 <0.04 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 Vinyl chloride <0.02 <0.02 <0.02 <0.02 <0.04 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.08 <0.02 <0.02 <0.80 <0.02 <0.02 <0.02 <0.02 <0.02 <0.80 <0.02 <0.02 <0.02 <0.02 Trichloroethylene <0.02 <0.20 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 t-1,2-dichloroethylene <0.02 <0.02 <0.02 <0.02 <0.04 <0.02 <0.02 <0.02 <0.80 <0.02 <0.02 <0.20 <0.02 <0.02 c-1,2-dichloroethylene <0.02 Tetrachloroethylene Special Notes: Analyst Initials/Date: TPH 2/22/15 Page 17 of 19 15B0598_2 Contest_Final /25/15 17:04:29

116 Table of Contents Air Sampling Media Certificate of Analysis Date Analyzed: 1/23/2015 Batch #: B D Certification Type: Batch Certified Individual Certified Media Type: Summa Canister Flow Controllers Media IDs: BC2136 Note:Two ID's grouped together, for example BC2136/BC3145, represents matched pairs of certified summa canisters and flow controllers. Units: PPBv <0.80 <0.04 <0.02 <0.02 <0.20 <0.02 <0.04 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 Vinyl chloride <0.02 <0.02 <0.02 <0.02 <0.04 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.08 <0.02 <0.02 <0.80 <0.02 <0.02 <0.02 <0.02 <0.02 <0.80 <0.02 <0.02 <0.02 <0.02 Trichloroethylene <0.02 <0.20 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 t-1,2-dichloroethylene <0.02 <0.02 <0.02 <0.02 <0.04 <0.02 <0.02 <0.02 <0.80 <0.02 <0.02 <0.20 <0.02 <0.02 c-1,2-dichloroethylene <0.02 Tetrachloroethylene Special Notes: Analyst Initials/Date: TPH 2/22/15 Page 18 of 19 15B0598_2 Contest_Final /25/15 17:04:29

117 Table of Contents Air Sampling Media Certificate of Analysis Date Analyzed: 1/23/2015 Batch #: B D Certification Type: Batch Certified Individual Certified Media Type: Summa Canister Flow Controllers Media IDs: BC2193 Note:Two ID's grouped together, for example BC2136/BC3145, represents matched pairs of certified summa canisters and flow controllers. Units: PPBv <0.80 <0.04 <0.02 <0.02 <0.20 <0.02 <0.04 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 Vinyl chloride <0.02 <0.02 <0.02 <0.02 <0.04 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.08 <0.02 <0.02 <0.80 <0.02 <0.02 <0.02 <0.02 <0.02 <0.80 <0.02 <0.02 <0.02 <0.02 Trichloroethylene <0.02 <0.20 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 t-1,2-dichloroethylene <0.02 <0.02 <0.02 <0.02 <0.04 <0.02 <0.02 <0.02 <0.80 <0.02 <0.02 <0.20 <0.02 <0.02 c-1,2-dichloroethylene <0.02 Tetrachloroethylene Special Notes: Analyst Initials/Date: TPH 2/22/15 Page 19 of 19 15B0598_2 Contest_Final /25/15 17:04:29

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