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11-12 30TH DRIVE
QUEENS, NEW YORK
Remedial Investigation Report
OER Project Number: 16EHAZ012Q
Prepared for:
11-12 30th Drive LLC
35-11 36th Street, 3rd Floor,
Astoria, New York 11106
718.204.0814
Prepared by:
HarPar Engineering, P.C.
88 Deer Park Blvd, Dix Hills, NY 11746
631.241.0938
SEPTEMBER 2015
2
REMEDIAL INVESTIGATION REPORT
TABLE OF CONTENTS
FIGURES ................................................................................................................................. 3
LIST OF ACRONYMS ........................................................................................................... 6
CERTIFICATION ................................................................................................................... 7
EXECUTIVE SUMMARY ..................................................................................................... 8
REMEDIAL INVESTIGATION REPORT .......................................................................... 12
1.0 SITE BACKGROUND............................................................................................... 12
1.1 Site Location and Current Usage ............................................................................ 12
1.2 Proposed Redevelopment Plan ............................................................................... 12
1.3 Description of Surrounding Property ...................................................................... 12
2.0 SITE HISTORY ......................................................................................................... 14
2.1 Past Uses and Ownership ........................................................................................ 14
2.2 Previous Investigations ........................................................................................... 14
2.3 Site Inspection ......................................................................................................... 14
2.4 Areas of Concern .................................................................................................... 15
3.0 PROJECT MANAGEMENT ..................................................................................... 16
3.1 Project Organization ............................................................................................... 16
3.2 Health and Safety .................................................................................................... 16
3.3 Materials Management............................................................................................ 16
4.0 REMEDIAL INVESTIGATION ACTIVITIES ......................................................... 17
4.1 Geophysical Investigation ....................................................................................... 17
4.2 Borings and Monitoring Wells................................................................................ 17
4.3 Sample Collection and Chemical Analysis ............................................................. 19
5.0 ENVIRONMENTAL EVALUATION....................................................................... 23
5.1 Geological and Hydrogeological Conditions .......................................................... 23
5.2 Soil Chemistry ........................................................................................................ 24
5.3 Groundwater Chemistry .......................................................................................... 24
5.4 Soil Vapor Chemistry ............................................................................................. 25
5.5 Prior Activity .......................................................................................................... 25
5.6 Impediments to Remedial Action ........................................................................... 25
3
FIGURES
Figure 1 – Site Plan showing Sampling Locations
Figure 2 – Proposed Site Redevelopment
Figure 3 – NYC DCP Zoning Map
Figure 4 – Surrounding Land Usage
Figure 5 – Groundwater Level Elevations
4
TABLES
Table 1 – Volatile Organic Compounds – Soil
Table 2 – Semi-Volatile Organic Compounds – Soil
Table 3 – Pesticides/PCBs – Soil
Table 4 – Metals – Soil
Table 5 – Volatile Organic Compounds – Groundwater
Table 6 – Semi-Volatile Organic Compounds – Groundwater
Table 7 – Pesticides/PCBs – Groundwater
Table 8 – Metals – Groundwater
Table 9 – Volatile Organic Compounds (TO-15) – Soil Vapor
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APPENDICES
Appendix A – Photographs
Appendix B – Soil Boring Logs
Appendix C – Laboratory Analytical Reports
Appendix D – Phase I ESA, dated February 4, 2014
Appendix E – Limited Phase II ESA, dated March 17, 2014
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LIST OF ACRONYMS
Acronym Definition
AOC Area of Concern
CAMP Community Air Monitoring Plan
COC Contaminant of Concern
CPP Citizen Participation Plan
CSM Conceptual Site Model
DER-10 New York State Department of Environmental Conservation
Technical Guide 10
FID Flame Ionization Detector
GPS Global Positioning System
HASP Health and Safety Plan
HAZWOPER Hazardous Waste Operations and Emergency Response
IRM Interim Remedial Measure
NAPL Non-aqueous Phase Liquid
NYC VCP New York City Voluntary Cleanup Program
NYC DOHMH New York City Department of Health and Mental Hygiene
NYC OER New York City Office of Environmental Remediation
NYS DOH
ELAP
New York State Department of Health Environmental
Laboratory Accreditation Program
OSHA Occupational Safety and Health Administration
PID Photoionization Detector
QEP Qualified Environmental Professional
RI Remedial Investigation
RIR Remedial Investigation Report
SCO Soil Cleanup Objective
SPEED Searchable Property Environmental Electronic Database
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CERTIFICATION
I, Hardik Parekh, P.E., am a Qualified Environmental Professional, as defined in RCNY §
43-1402(ar). I have primary direct responsibility for implementation of the Remedial
Investigation for the 11-12 30th Drive Site (NYC OER Project 16EHAZ012Q). I am responsible
for the content of this Remedial Investigation Report (RIR), have reviewed its contents and
certify that this RIR is accurate to the best of my knowledge and contains all available
environmental information and data regarding the property.
Qualified Environmental Professional Date Signature
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EXECUTIVE SUMMARY
The Remedial Investigation Report (RIR) provides sufficient information for establishment
of remedial action objectives, evaluation of remedial action alternatives, and selection of a
remedy pursuant to RCNY§ 43-1407(f). The remedial investigation (RI) described in this
document is consistent with applicable guidance.
Site Location and Current Usage
The Site is located at 11-12 30th Drive in the Astoria section in Queens, New York and is
identified as Block 504 and New Lot 3 (previous lots 3 & 21, NYC DOB recently combined both
lots) on the New York City Tax Map. The Site is approximately 21,100-square feet and is
bounded by 30th Drive to the north, 31st Avenue to the south, 12th Street to the east, and Vernon
Boulevard to the west. A map of the site boundary is shown in Figure 1. Currently, the Site is
developed with two 1-story concrete block and brick buildings, a 1-story metal-constructed
storage building and associated concrete-paved parking lots. The Site is currently occupied by
The Bohea Associates NY, Ltd. (“Bohea”), an Asian food distribution company, and Titan
Media, an advertising display company.
Summary of Proposed Redevelopment Plan
The proposed future use of the Site will consist of two (2) residential buildings, totaling 711
apartments, including approximately 28,763 square foot courtyard. Layout of the proposed site
development is presented in Figure 2. The current zoning designation is R7A, R6B, a general
residential district. A brief R6B zoning guideline from the NYC DCP is attached as Figure 3.
The proposed use is consistent with existing zoning for the property.
The proposed development shall include two (2) residential buildings on the Site with a
footprint of approximately 70,102 square feet. The 1st building shall include a 9-story residential
building with two cellar levels and will have a total of 569 apartments. The cellars shall include
below grade parking and mechanical rooms. The 1st floor will comprise of common accessible
lobby and some recreation area for the residents. The street address for this building will be 30-
77 Vernon Boulevard, Astoria, NY 11102. The average depth of excavation shall be
approximately 15 feet below existing street grade.
The 2nd building shall comprise of a 6-story residential building with one cellar level and will
have a total of 142 affordable apartments. The cellar shall be used for parking and mechanical
9
rooms. The new address for this building shall be 30-80 12th Street, Astoria, NY 11102. The
average depth of excavation shall be approximately 15 feet below existing street grade.
The existing one-story building located on the southern portion of the Site (former Lot 3)
shall remain in place and will go through inside renovation. The existing building is
approximately 21,100 square feet. The total amount of soil expected to be removed for the
excavation is approximately 0 cubic yards.
Summary of Past Uses of Site and Areas of Concern
Prior to the construction of the existing improvements, previous Lot 3 was a vacant lot as of
at least 1898 to 1950 and previous Lot 21 was a vacant lot from at least 1915 to 1936. Prior to
that, previous Lot 21 contained two dwellings with two associated small sheds in at least
1898.The AOCs identified for this Site in a previous Phase I report prepared by IVI in 2014
include:
1. New York City Little “E” Designation – An “E” Designation was placed on the Subject
Property for Hazardous Materials (E-245).
2. The Subject Site was formerly occupied by Pop Displays Drive, which was listed as a
Conditionally Exempt Small Quantity Generator (CESQG) in 2006 and 2007. This
facility was also listed as a Small Quantity Generator (SQG) in 1999 and as a Large
Quantity Generator (LQG) in 1984.
3. Two inactive aboveground storage tanks (ASTs) were observed in the northwestern
section of the cellar of the building located on former Lot 21. The tanks were constructed
with steel and had capacities of 5,000-gallons and 275-gallons.
Summary of the Work Performed under the Remedial Investigation
1. Conducted a Site inspection to identify AOCs and physical obstructions (i.e. structures,
buildings, etc.);
2. Installed six (6) soil borings across the entire project Site, and collected twelve (12) soil
samples for chemical analysis from the soil borings to evaluate soil quality;
3. Installed three (3) groundwater monitoring wells throughout the Site to establish
groundwater flow and collected three (3) groundwater samples for chemical analysis to
evaluate groundwater quality;
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4. Installed six (6) soil vapor probes around Site perimeter and collected six (6) samples for
chemical analysis.
Summary of Environmental Findings
1. Elevation of the property ranges from 10 to 12 feet.
2. Depth to groundwater ranges from 13 to 18 feet at the Site.
3. Groundwater flow is generally from east to west beneath the Site.
4. Bedrock was not encountered during this investigation.
5. The soils at the Site are classified as Urban Land and generally consisted of dark brown,
fine to coarse sand with medium to fine gravel to a depth of approximately 13 to 18 feet
bgs, where the groundwater table was encountered. The vicinity of the Site is
approximately 10 feet above mean sea level.
6. Soil/fill samples collected during the 2014 Phase II and 2015 RI were compared to
6NYCRR Part 375-6.8 Unrestricted Use Soil Cleanup Objectives (SCOs) and Restricted-
Residential SCOs. Soil/fill samples showed that no VOCs, SVOCs, pesticides or PCBs
were detected in any of the soil samples at concentrations above the Unrestricted Use
SCOs. One metal, i.e., lead, was detected in sample SB-1 0’-2’ at a concentration of 115
mg/kg, exceeding the Unrestricted Use SCO. Overall, soil chemistry is unremarkable.
7. Groundwater samples collected during the 2014 Phase II and 2015 RI were compared to
NYSDEC 6NYCRR Part 703.5 Groundwater Quality Standards (GQS). Groundwater
samples showed that no pesticides or PCBs were detected in any of the groundwater
samples at concentrations above their respective GQS. One VOC, tetrachloroethene (6.4
ug/L), was detected above its GQS. Four SVOCs, benzo(a)anthracene (0.16 ug/L),
benzo(a)pyrene (0.14ug/L), benzo(b)fluoranthene (0.13ug/L) and chrysene (0.15 ug/L)
were detected above their respective GQS. Several metals were identified and, of those,
beryllium (3.5 ug/L), manganese (max of 848 ug/L), nickel (max of 442 ug/L) and
sodium (44,800 ug/L) were detected in dissolved groundwater samples at concentrations
above their respective GQS.
8. Soil vapor samples collected during the 2014 Phase II and 2015 RI were compared to the
compounds in Table 3.1 Air Guidance Valued derived by the New York State of Health
(NYSDOH) Final Guidance on Soil Vapor Intrusion (October 2006). Soil vapor samples
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collected during the RI showed petroleum related VOCs present in low concentrations.
Total concentrations of petroleum-related VOCs (BTEX) had a maximum concentration
of 402.3 µg/m3. Samples showed elevated levels of chlorinated VOCs including 1,1,1-
trichloroethane (max. of 13,000 µg/m3), tetrachloroethene (max. of 11,000 µg/m3)
trichloroethane ( max of 3,700 µg/m3) in all six samples. All three compounds were
found detected above the monitoring/mitigation ranges established within the NYSDOH
Final Guidance on Soil Vapor Intrusion. Carbon tetrachloride was not detected in any of
the soil vapor samples.
These chlorinated solvent vapors identified in the soil vapor samples may be eluting from
an offsite source, as no prior use of solvents on the Site is known. Also, the soil and
groundwater results did not identify any chlorinated solvent contamination.
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REMEDIAL INVESTIGATION REPORT
1.0 SITE BACKGROUND
11-12 30th Drive LLC is working with the New York City Mayor’s Office of Environmental
Remediation (NYC OER) to investigate and potentially remediate a 21,100-square foot site
located at 11-12 30th Drive in Astoria section of Queens, New York. Residential use is proposed
for the property. The RI work was performed between August 24 and August 26, 2015. This
RIR summarizes the nature and extent of contamination and provides sufficient information for
establishment of remedial action objectives, evaluation of remedial action alternatives, and
selection of a remedy that is protective of human health and the environment consistent with the
use of the property pursuant to RCNY§ 43-1407(f).
1.1 Site Location and Current Usage
The Site is located at 11-12 30th Drive in the Astoria section in Queens, New York and is
identified as Block 504 and New Lot 3 (previous lots 3 & 21, NYC DOB recently combined both
lots) on the New York City Tax Map. The Site is approximately 21,100-square feet and is
bounded by 30th Drive to the north, 31st Avenue to the south, 12th Street to the east, and Vernon
Boulevard to the west. A map of the site boundary is shown in Figure 1. Currently, the Site is
developed with two 1-story concrete block and brick buildings, a 1-story metal-constructed
storage building and associated concrete-paved parking lots. The Site is currently occupied by
The Bohea Associates NY, Ltd. (“Bohea”), an Asian food distribution company, and Titan
Media, an advertising display company.
1.2 Proposed Redevelopment Plan
The proposed future use of the Site will consist of two (2) residential buildings, totaling 711
apartments, including approximately 28,763 square foot courtyard. Layout of the proposed site
development is presented in Figure 2. The current zoning designation is R7A, R6B, a general
residential district. A brief R6B zoning guideline from the NYC DCP is attached as Figure 3.
The proposed use is consistent with existing zoning for the property.
The proposed development shall include two (2) residential buildings on the Site with a
footprint of approximately 70,102 square feet. The 1st building shall include a 9-story residential
building with two cellar levels and will have a total of 569 apartments. The cellars shall include
13
below grade parking and mechanical rooms. The 1st floor will comprise of common accessible
lobby and some recreation area for the residents. The street address for this building will be 30-
77 Vernon Boulevard, Astoria, NY 11102. The average depth of excavation shall be
approximately 15 feet below existing street grade.
The 2nd building shall comprise of a 6-story residential building with one cellar level and will
have a total of 142 affordable apartments. The cellar shall be used for parking and mechanical
rooms. The new address for this building shall be 30-80 12th Street, Astoria, NY 11102. The
average depth of excavation shall be approximately 15 feet below existing street grade.
1.3 Description of Surrounding Property
The Subject Property is bordered to the northeast by 30th Drive, residential buildings and a
commercial building; to the southeast by 12th Street, a residential building and a commercial
building; to the southwest by 31st Avenue, residential buildings and a commercial building; and
to the northwest by Vernon Boulevard and East River. Extended range surrounding properties
are consistent with the neighborhood trend of residential, commercial and light industrial
properties.
Figure 4 shows the surrounding land usage.
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2.0 SITE HISTORY
2.1 Past Uses and Ownership
Prior to the construction of the existing improvements, previous Lot 3 was a vacant lot as of
at least 1898 to 1950 and previous Lot 21 was a vacant lot from at least 1915 to 1936. Prior to
that, previous Lot 21 contained two dwellings with two associated small sheds in at least 1898.
Previous occupants of the Site include the following:
Lot 3- Residental (1934)
Kikkoman International, Inc. (1967)
Japan Food Corporation (1967-70)
Japan Freight Consolidators (1970)
Lot 21 – General Motors Parts Division/Sales Corporation (1939-70)
Pop Displays/Phase Four Production (1983-05)
Bohea Associated NY Ltd. (2013)
Certified Locksmith, Jack the Plumber, Hoi Fung Seafood, Inc. (2013)
2.2 Previous Investigations
Both Phase I and Limited Phase II Environmental Site Assessments were conducted on this
Site prior to implementation of this Remedial Investigation. Previous environmental reports
prepared for this Site included:
1. Phase I Environmental Site Assessment by IVI Assessment Services, Inc. for Vernon
Realty, dated February 4, 2014.
2. Limited Phase II Environmental Site Assessment by IVI Environmental, Inc. for
Vernon Realty, dated March 17, 2014.
Both assessments revealed similar findings and are documented in this RIR report. Both
documents are provided hereto for further reference as Appendix D and Appendix E,
respectively.
2.3 Site Inspection
HARPAR conducted a Site inspection on August 21, 2015 focused on locating evidence of
surface spills, buried tanks, vent pipes and clearing proposed boring locations. An interior
15
inspection of the Site did not identify any environmental concerns, except for the metal storage
building which was inaccessible.
2.4 Areas of Concern
The AOCs identified for this Site in the previous Phase I report include:
1. New York City Little “E” Designation – An “E” Designation was placed on the
Subject Property for Hazardous Materials (E-245).
2. The Subject Site was formerly occupied by Pop Displays Drive, which was listed as a
Conditionally Exempt Small Quantity Generator (CESQG) in 2006 and 2007. This
facility was also listed as a Small Quantity Generator (SQG) in 1999 and as a Large
Quantity Generator (LQG) in 1984.
3. Two inactive aboveground storage tanks (ASTs) were observed in the northwestern
section of the cellar of the building located on former Lot 21. The tanks were
constructed with steel and had capacities of 5,000-gallons and 275-gallons.
A copy of the Phase I Report is presented in Appendix D.
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3.0 PROJECT MANAGEMENT
3.1 Project Organization
The Qualified Environmental Profession (QEP) responsible for investigation activities and
preparation of this RIR is Mr. Hardik Parekh, P.E.
3.2 Health and Safety
All work described in this RIR was performed in full compliance with applicable laws and
regulations, including Site and OSHA worker safety requirements and HAZWOPER
requirements.
3.3 Materials Management
All material encountered during the RI was managed in accordance with applicable laws and
regulations.
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4.0 REMEDIAL INVESTIGATION ACTIVITIES
HARPAR performed the following scope of work:
1. Conducted a Site inspection to identify AOCs and physical obstructions (i.e.
structures, buildings, etc.);
2. Installed six (6) soil borings across the entire project Site, and collected twelve (12)
soil samples for chemical analysis from the soil borings to evaluate soil quality;
3. Installed three (3) groundwater monitoring wells throughout the Site to establish
groundwater flow and collected three (3) groundwater samples for chemical analysis
to evaluate groundwater quality;
4. Installed six (6) soil vapor probes around Site perimeter and collected six (6) samples
for chemical analysis.
4.1 Geophysical Investigation
A geophysical survey was previously performed at this Site as part of the 2014 Limited
Phase II ESA. A fill port and vent pipe attached to a suspected underground storage tank (UST)
was identified. However, due to the building’s reinforced concrete slab, the presence of the UST
could not be confirmed. Based on the findings of the previous survey, HARPAR did not perform
a geophysical survey during this RI as it was deemed unwarranted.
4.2 Borings and Monitoring Wells
Drilling and Soil Logging
A total of six (6) soil borings (SB-1 through SB-6) were advanced at the Site as part of this
RI in accordance with an OER-approved sampling plan. The soil borings were advanced
utilizing a track-mounted direct-push drilling rig (Geoprobe 7822DT) by Active Environmental
Technologies, Inc. The soil borings were placed at locations throughout the Site within the
building and in the parking areas. Soil boring SB-4, originally proposed to be installed within
the metal storage building, was relocated outside to the north of the building due to
inaccessibility. The soil borings were advanced to depths of approximately 8 feet below grade
surface (bgs) to 20 feet bgs. The soils were field screened continuously to the final advancement
depths of each boring for visual impacts and for volatile organic vapors with a photoionization
18
detector (PID). PID readings were all 0.0 parts per million (ppm). Soil lithology was logged
based on the Unified Soil Classification System (USCS).
Boring logs were prepared by an environmental engineer are attached in Appendix B. A map
showing the location of soil borings and monitoring wells is shown in Figure 1.
Groundwater Monitoring Well Construction
A total of three (3) temporary groundwater wells (GW-1 through GW-3) were installed at the
Site as part of this RI in accordance with an OER-approved sampling plan. The wells were
installed utilizing a track-mounted direct-push drilling rig (Geoprobe 7822DT) by Active
Environmental Technologies, Inc. Groundwater sampling was conducted in accordance with the
procedures set forth in the NYSDEC DER-10 Technical Guidance for Site Investigation and
Remediation, dated May 2010.
The temporary groundwater wells were placed at locations throughout the Site within the
building and in the parking areas. The wells were installed to depths of approximately 20 to 25
feet bgs utilizing one-inch PVC piping. The wells were completed with bottom 10 feet of slotted
PVC screen pipe with top 10 to 15 feet of solid PVC riser pipe. Groundwater was encountered
in the wells at depths varying between 13 to 18 feet bgs.
Temporary monitoring well locations are shown in Figure 1.
Soil Vapor Probe Construction
A total of six (6) soil vapor probes were installed at the Site by an expendable metal soil
vapor implant utilizing a track-mounted direct-push drilling rig. The soil vapor points were
placed at locations throughout the Site within the building and in the parking areas. Soil vapor
point SV-6, originally proposed to be installed within the metal storage building, was relocated
outside to the north of the building due to inaccessibility. The vapor points were installed to
depths of approximately 15 feet bgs.
Once installed, HARPAR attached the polyethylene tubing to a hand pump and extracted
several volumes to remove atmospheric air that entered the bore hole. The tubing was then
connected to a 6L-liter summa vacuum canister equipped with a half -hour flow regulator. The
soil vapor probes were advanced to the desired depth using a direct push drill rig. The vapor
probes consisted of Geoprobe soil vapor implants (a 6-inch length of double woven stainless
steel wire). The implants were attached to a ¼-inch polyethylene tubing which extended
19
approximately 24 inches beyond the ground surface. The soil vapor implant tubing was capped
with a ¼-inch plastic end to prevent infiltration of foreign particles into the tubing. Coarse sand
was placed around the vapor implants to a height of approximately 12 inches above the bottom
of the implants. The remaining annular space was sealed with a bentonite slurry to the surface.
Soil vapor probe locations are shown in Figure 1.
Survey
Using a measuring wheel and Site boundaries as datum, sampling locations were depicted at
the Site.
Water Level Measurement
Groundwater at the Site was measured to the surface grade utilizing a water level meter.
4.3 Sample Collection and Chemical Analysis
Sampling performed as part of the field investigation was conducted for all Areas of Concern
and also considered other means for bias of sampling based on professional judgment, area
history, discolored soil, stressed vegetation, drainage patterns, field instrument measurements,
odor, or other field indicators. All media including soil, groundwater and soil vapor have been
sampled and evaluated in the RIR. Discrete (grab) samples have been used for final delineation
of the nature and extent of contamination and to determine the impact of contaminants on public
health and the environment. The sampling performed and presented in this RIR provides
sufficient basis for evaluation of remedial action alternatives, establishment of a qualitative
human health exposure assessment, and selection of a final remedy.
Soil Sampling
A total of twelve (12) soil samples were collected for chemical analysis during this RI,
including two samples from each boring (one shallow and one deep samples). Figure 1 shows the
location of samples collected in this investigation. Soil analyses included volatile organic
compounds (VOCs) via EPA Method 8260, semi-volatile organic compounds (SVOCs) via EPA
Method 8270, Target Analyte List (TAL) metals, polychlorinated biphenyls (PCBs) via EPA
Method 8082 and pesticides via EPA Method 8081.
One (1) duplicate sample was also collected for laboratory QA/QC purposes. The duplicate
sample was collected from the shallow depth sample from boring SB-6 and analyzed for VOCs
20
only. None of the VOCs were detected in the duplicate sample at concentrations exceeding their
respective laboratory method detection limits. The duplicate sample results were consistent with
the actual sample results.
Groundwater Sampling
A total of three (3) groundwater samples were collected for chemical analysis during this RI.
Groundwater samples were collected utilizing dedicated polyethylene tubing and a standard
peristaltic pump. Prior to sampling, a check valve bailer was utilized to verify the presence of
petroleum floating product, none was observed. One (1) groundwater sample was collected from
each temporary groundwater well. Approximately three well volumes were purged from each
well prior to sample collection. The samples were collected utilizing low flow sampling
methodology. All purged groundwater was containerized in a 30-gallon drum for disposal.
One (1) duplicate sample was also collected for laboratory QA/QC purposes. The duplicate
sample was collected from boring GW-2 location and was analyzed for VOCs only. The
laboratory analytical results detected only chloroform at a concentration exceeding its laboratory
method detection limit. This detection was consistent with the chloroform detection in the actual
groundwater sample collected from GW-2.
Groundwater samples collected as part of this investigation were properly labeled,
preserved, and placed in a cooler for transport via courier to TestAmerica. Proper chain of
custody procedures were followed. The groundwater samples were analyzed for VOCs via EPA
Method 8260, SVOCs via EPA Method 8270, TAL metals (filtered and unfiltered), pesticides via
EPA Method 8081 and PCBs via EPA Method 8082. Following the sample collection, the PVC
pipe was removed and the surface was restored to pre-sampling conditions. Groundwater
monitoring well locations are provided in Figure 1.
Soil Vapor Sampling
A total of six (6) soil vapor probes were installed and six (6) soil vapor samples were
collected for chemical analysis during this RI. Soil vapor sampling locations are shown in Figure
1.
The soil vapor samples were analyzed by a NYSDOH ELAP-certified laboratory for volatile
organic compounds using EPA Method TO-15. Methodologies used for soil vapor assessment
conform to the NYS DOH Final Guidance on Soil Vapor Intrusion, October 2006. Prior to
21
sampling, each sampling location was tested to ensure a proper surface seal has been obtained.
In accordance with the NYSDOH guidance, a tracer gas (helium) was used as a quality
assurance/quality control device to verify the integrity of the sampling point prior to sample
collection. Prior to testing and sample collection, a 1’x’1 glass seal enclosure was utilized. The
enclosure was tested with helium tracer gas utilizing a helium detector for atleast 15 minutes.
The tracer gas test procedure was employed at all soil vapor sampling locations. No surface seal
leaks were observed at any of the locations.
Following the verification of tight seal, three volumes (i.e., volume of the sample probe and
tube) of air was purged for the soil vapor implants using a calibrated vacuum pump. After
purging, a 6-liter Summa® canister, fitted with a ½-hr flow controller, was attached to the
sample tubing. Prior to initiating sample collection, sample identification, canister number, date
and time were recorded. Sampling then proceeded by fully opening the flow control valve on
each canister. Following the sample collection, the canisters were submitted to the laboratory,
under proper chain-of-custody for VOC analysis by EPA Method TO-15.
Soil vapor probe locations are shown in Figure 1.
Chemical Analysis
Chemical analytical work presented in this RIR has been performed in the following manner:
Factor Description
Quality Assurance Officer The chemical analytical quality assurance is directed by Hardik
Parekh, P.E.
Chemical Analytical
Laboratory
Chemical analytical laboratory(s) used in the RI is NYS ELAP
certified and were TestAmerica
Chemical Analytical
Methods
Soil analytical methods:
TAL Metals by EPA Method 6010C (rev. 2007);
VOCs by EPA Method 8260C (rev. 2006);
SVOCs by EPA Method 8270D (rev. 2007);
22
Pesticides by EPA Method 8081B (rev. 2000);
PCBs by EPA Method 8082A (rev. 2000);
Groundwater analytical methods:
TAL Metals by EPA Method 6010C (rev. 2007);
VOCs by EPA Method 8260C (rev. 2006);
SVOCs by EPA Method 8270D (rev. 2007);
Pesticides by EPA Method 8081B (rev. 2000);
PCBs by EPA Method 8082A (rev. 2000);
Soil vapor analytical methods:
VOCs by TO-15 VOC parameters.
Results of Chemical Analyses
Laboratory data for soil are summarized in Tables 1 to 4. Laboratory data for groundwater
are summarized in Tables 5 to 8. Laboratory data for soil vapor are summarized in Table 9.
Laboratory data deliverables for all samples evaluated in this RIR are provided in digital form in
Appendix C.
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5.0 ENVIRONMENTAL EVALUATION
5.1 Geological and Hydrogeological Conditions
Stratigraphy
The soils at the Site are classified as Urban Land. Urban Land complex are those soils in
which the soil’s original structure and content have been so altered by human activities it has lost
its original characteristics and is thus unidentifiable. The bedrock at the Site is the Middle
Ordovician to Middle Cambrian Ravenswood Granodiorite. Along the western edge of the
property is the contact between the Ravenswood Granodiorite and the Inwood Marble. The
Inwood Marble is Lower Ordovician to Lower Cambrian.
The vicinity of the Site is approximately 10 feet above mean sea level. The ground surface at
the Site consists of asphalt-paved open area for parking and two (2) one-story
commercial/industrial buildings with approximately 6-inch thick concrete slab. The topography
of the area has a moderate to steep downward slope to the west, 12th Street towards Vernon
Boulevard (towards East River). Soil samples collected from soil borings advanced during the
RI generally consisted of dark brown, fine to coarse sand with medium to fine gravel to a depth
of approximately 13 to 18 feet bgs, where the groundwater table was encountered.
Hydrogeology
A table of water level data for all monitor wells is included in Table 5.1.1 below. The
average depth to groundwater is 15 feet below grade and the range in depth is 13 to 18 feet bgs.
A map of groundwater level elevations with groundwater contours and inferred flow lines is
shown in Figure 5. Groundwater flow is from east to west.
Table 5.1.1 Groundwater Level Data
Monitoring Well ID No. Date Water Elevation (feet below
grade surface)
GW-1 8/26/2015 15.10
GW-2 8/26/2015 13.75
GW-3 8/26/2015 17.75
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5.2 Soil Chemistry
Soil/fill samples collected during the 2014 Phase II and 2015 RI were compared to 6NYCRR
Part 375-6.8 Unrestricted Use Soil Cleanup Objectives (SCOs) and Restricted-Residential
SCOs. Soil/fill samples showed that no VOCs, SVOCs, pesticides or PCBs were detected in any
of the soil samples at concentrations above the Unrestricted Use SCOs. One metal, i.e., lead,
was detected in sample SB-1 0’-2’ at a concentration of 115 mg/kg, exceeding the Unrestricted
Use SCO.NYCRR Part 375 Unrestricted Use Soil Cleanup Objectives.
Data collected during the RI is sufficient to delineate the vertical and horizontal distribution
of contaminants in soil/fill at the Site. Summary tables of data for chemical analyses performed
on soil samples are included in Tables number1 to 4. Figure 1 shows the soil sampling locations.
5.3 Groundwater Chemistry
Groundwater samples collected during the 2014 Phase II and 2015 RI were compared to
NYSDEC 6NYCRR Part 703.5 Groundwater Quality Standa rds (GQS). Groundwater samples
showed that no pesticides or PCBs were detected in any of the groundwater samples at
concentrations above their respective GQS. One VOC, tetrachloroethene (6.4 ug/L), was
detected above its GQS. Four SVOCs, benzo(a)anthracene (0.16 ug/L), benzo(a)pyrene
(0.14ug/L), benzo(b)fluoranthene (0.13ug/L) and chrysene (0.15 ug/L) were detected above their
respective GQS. Four metals, beryllium (3.5 ug/L), manganese (max of 848 ug/L), nickel (max
of 442 ug/L) and sodium (44,800 ug/L) were detected in filtered groundwater samples at
concentrations above their respective GQS.
Data collected during the RI is sufficient to delineate the distribution of contaminants in
groundwater at the Site. Summary tables of data for chemical analyses performed on
groundwater samples are included in Tables 5 to 8. Figure 1 shows the groundwater sampling
locations.
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5.4 Soil Vapor Chemistry
Soil vapor samples collected during the 2014 Phase II and 2015 RI were compared to the
compounds in Table 3.1 Air Guidance Valued derived by the New York State of Health
(NYSDOH) Final Guidance on Soil Vapor Intrusion (October 2006). Soil vapor samples
collected during the RI showed petroleum related VOCs present in low concentrations. Total
concentrations of petroleum-related VOCs (BTEX) had a maximum concentration of 402.3
µg/m3. Samples showed elevated levels of chlorinated VOCs including 1,1,1-trichloroethane
(max. of 13,000 µg/m3), tetrachloroethene ( max. of 11,000 µg/m3) trichloroethane ( max of
3,700 µg/m3) in all six samples. All three compounds were found detected above the
monitoring/mitigation ranges established within the NYSDOH Final Guidance on Soil Vapor
Intrusion. Carbon tetrachloride was not detected in any of the soil vapor samples.
These chlorinated solvent vapors identified in the soil vapor samples may be eluting from an
offsite source, as no prior use of solvents on the Site is known. Also, the soil and groundwater
results did not identify any chlorinated solvent contamination.
Data collected during the RI is sufficient to delineate the distribution of contaminants in soil
vapor at the Site. A summary table of data for chemical analyses performed on soil vapor
samples are included in Table 9. Figure 1 shows the soil vapor locations.
5.5 Prior Activity
Based on an evaluation of the data and information from the RIR, disposal of significant
amounts of hazardous waste is not suspected at this site.
5.6 Impediments to Remedial Action
There are no known impediments to remedial action at this property.