HomeMy WebLinkAbout21061 Berryhill Thrift Brownfields Assessment Work Plan-Revision1_20160929
Via Email
September 29, 2017
Brownstone Properties II, LLC
442½ East Main Street
Clayton, North Carolina 27520
Attn: Mr. George Newell Whiting, Jr. (Pete)
Re: Supplemental Brownfields Assessment Work Plan – Revision 1
Berryhill Road Site & Thrift Road II Site
Charlotte, North Carolina
Brownfields Project ID#s 20091-16-60 and 21013-17-60
H&H Project No. BRN-002
Dear Pete:
1.0 Introduction
Hart & Hickman, PC (H&H) is providing this revised work plan to conduct supplemental
Brownfields assessment activities at the Berryhill Road Brownfields property (Brownfields
Project No. 20091-16-60) and the Thrift Road II Brownfields property (Brownfields Project No.
21013-17-60) located in Charlotte, North Carolina (Site or subject Site). A Site location map is
provided as Figure 1. This work plan has been revised to address North Carolina Department of
Environmental Quality (DEQ) comments to the July 26, 2017 Supplemental Brownfields
Assessment Work Plan provided on September 28, 2017.
The Berryhill Road Brownfields property is currently undeveloped vacant land. The Thrift Road
II Brownfields property is developed with five (5) commercial buildings. For ease of reference,
the Site buildings are labeled Building 1 through Building 5 on Figure 2. Three of the Site
buildings located in northern portions of the Site nearest the Berryhill Road property are
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Mr. George Newell Whiting, Jr.
September 29, 2017
Page 2
unoccupied (Building 1 through Building 3). The two smaller buildings located in the south-
central portion of the Thrift Road II property are currently occupied by an auto repair business.
H&H recently conducted Brownfields soil and groundwater assessment activities at the Site
between June 5 and 9, 2017. The soil and groundwater assessment activities were conducted in
accordance with our Brownfields Assessment Work Plan – Revision 1 dated May 23, 2017
which was approved by the DEQ Brownfields Program in email correspondence dated May 24,
2017. Because preliminary results of the June 2017 soil assessment activities indicate the
presence of several volatile organic compounds (VOCs) and semi-volatile organic compounds
(SVOCs) above the DEQ Inactive Hazardous Sites Branch (IHSB) Residential and
Industrial/Commercial Preliminary Soil Remediation Goals (PSRGs) and polychlorinated
biphenyls (PCBs) above Residential PSRGs in one or more deep soil samples collected from the
southwest portion of the Berryhill Road Site. H&H proposes to collect additional soil samples to
evaluate shallow soil conditions at these locations.
In addition, preliminary results of the June 2017 groundwater assessment indicate the presence
of several VOCs above the DEQ Division of Waste Management (DWM) Non-Residential
Vapor Intrusion Screening Concentrations (Vapor Intrusion) Groundwater Screening Levels
(GWSLs) in temporary monitoring wells installed within close proximity to the existing
Thrift Road II Site buildings. Therefore, H&H proposes to conduct vapor intrusion assessment
activities to evaluate the potential for structural vapor intrusion into the Thrift Road II Site
buildings.
The purpose of this work plan is to outline supplemental Brownfields assessment activities to be
conducted to further evaluate shallow soil conditions in the southwest portion of the
Berryhill Road Site, and evaluate the potential for structural vapor intrusion concerns for the
Thrift Road II Site buildings. A brief description of the proposed assessment activities is
provided in the sections below.
Mr. George Newell Whiting, Jr.
September 29, 2017
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2.0 Supplemental Brownfields Assessment Scope of Work
The proposed assessment activities will be performed in general accordance with DEQ’s IHSB
Guidelines for Assessment and Cleanup (Guidelines) dated October 2015, DEQ’s DMW Vapor
Intrusion Guidance dated April 2014, and most recent versions of the U.S. Environmental
Protection Agency (EPA) Region IV Science and Ecosystem Support (SESD) Field Branches
Quality System and Technical Procedures guidance.
Prior to conducting the field activities, H&H will contact North Carolina 811, the public utility
locator, to mark subsurface utilities located on the Site. Additionally, soil boring locations will
be hand cleared to approximately 5 feet (ft) below the ground surface (bgs) to further screen the
boring locations for the presence of subsurface utilities.
2.1 Additional Soil Assessment Activities
H&H proposes to conduct additional soil assessment activities in the vicinity of four previous
soil borings where VOCs, SVOCs, and/or PCBs were detected above the DEQ IHSB PSRGs in
one or more deeper soil samples on the Berryhill Road Site. In addition, H&H proposes to
collect three additional soil samples in the northeastern portion of the CSX parcel near the SB-5
soil sample location to evaluate the lateral extent of potential impacts identified in this area of
the Site. The proposed soil sample locations (denoted by SB nomenclature) are depicted on
Figure 2, and include the following locations:
Containment Area 2 (SB-4)
overland drainage area in the southwestern portion of the 1223 Berryhill Road parcel and
the northeastern portion of the former CSX parcel (SB-5)
overland drainage area in the northeastern portion of the former CSX parcel (SB-5A
through SB-5C)
AST area located west-southwest of the former Cherokee Oil facility (SB-8)
Mr. George Newell Whiting, Jr.
September 29, 2017
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Containment Area 1 (SB-9)
The soil borings will be advanced to depths of approximately 5 ft bgs utilizing a decontaminated
stainless steel hand auger. During boring advancement, continuous soil samples will be
collected from the center of the hand auger bucket. Soil samples will be inspected for the
presence of visual indication of impact and screened for the presence of volatile organic vapors
with a calibrated photoionization detector (PID). Based upon field screening, one soil sample
will be collected from each soil boring for laboratory analysis from shallow soil (1-2 ft or 2-3 ft
bgs).
Following collection, the soil samples will be placed in dedicated laboratory-supplied sample
containers, labeled with the sample identification, date, and requested analysis, and placed in a
laboratory supplied cooler with ice. The samples will be delivered to a North Carolina certified
laboratory under standard chain of custody protocols for analysis of VOCs by EPA Method
8260, SVOCs by EPA Method 8270, PCBs by EPA Method 8082 and Resource Conservation
and Recovery Act (RCRA) metals plus hexavalent chromium by EPA Method 6010/7471/7196.
In addition, H&H will collect soil samples for PCB Congeners by EPA Method 1668, and
request that the laboratory hold the samples pending analytical results for samples analyzed for
PCBs by EPA Method 8082. If PCBs are detected in soil samples using EPA Method 8082,
H&H will contact DEQ to discuss analyzing that sample for congener-specific analysis.
To evaluate the reproducibility of the sample results, H&H will collect one duplicate soil sample
from the proposed samples that will be submitted for analysis of VOCs by EPA Method 8260,
SVOCs by EPA Method 8270, and RCRA metals plus hexavalent chromium by EPA Method
6010/7471/7196. Additionally, H&H will request that the laboratory reporting limits meet the
IHSB Residential PSRGs, if possible. Please refer to Section 2.3 below for additional laboratory
quality assurance/quality control procedures and reporting limit information.
Mr. George Newell Whiting, Jr.
September 29, 2017
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Following sampling activities, the soil sample borings will be properly abandoned and the
surfaces will be repaired similar to pre-drilling conditions. Additionally, the soil sample
locations will be estimated using a sub-meter global positioning system (GPS) unit.
2.2 Sub-slab Vapor and Indoor Air Assessment Activities
Results of analysis of groundwater samples collected at the Site indicate compound
concentrations above DEQ DWM Non-Residential Vapor Intrusion GWSLs in wells TMW-1,
TMW-4, and TMW-5. TMW-4 and TMW-5 are located near the northern portion of the Thrift
Road II western Site building. To evaluate the potential for structural vapor intrusion into the
existing Site buildings, H&H proposes to collect four concurrent sub-slab vapor and indoor air
samples inside the Thrift Road II Site buildings. The proposed sub-slab and indoor air sample
locations (denoted by SSV and IAQ nomenclature, respectively) are depicted on Figure 2, and
include the following areas:
Building 1 - northern portion of the western Site building (SSV-1/IAQ-1)
Building 1 -southern portion of the western Site building (SSV-2/IAQ-2)
Building 3 - Basement area of the eastern Site building (SSV-3/IAQ-3)
Building 4 - southwestern portion of the central Site building (SSV-4/IAQ-4)
In addition, one exterior background sample will also be collected from an upwind location
outside of the Thrift Road II Site buildings during the indoor air sampling event. The location of
the outdoor background sample will be determined on the day of the sampling based upon the
prevailing wind direction on that day. One duplicate sub-slab vapor sample and one duplicate
indoor air sample will also be collected from one of the locations.
2.2.1 Sub-slab Vapor Point Installation
At each sample location, H&H will install temporary sub-slab vapor (SSV) sample points
Mr. George Newell Whiting, Jr.
September 29, 2017
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utilizing a hammer drill and 1-inch diameter drill bit to advance a bore hole through the concrete
slab. The borings will be advanced to approximately 4 inches beneath the slab into the
underlying soil to penetrate potential vapor barriers beneath the concrete slab. A dedicated AMS
gas vapor tip connected to Teflon tubing that extends to the surface will be seated in the base of
the boring. A sand filter pack will then be placed from the base of boring to base of the concrete
slab to cover the gas vapor tip. The sample points will be completed by placing a hydrated
bentonite seal from the top of the sand filter pack to the surface.
Prior to sampling, a leak check will be conducted at each SSV sample location by constructing a
shroud around the sampling point and flooding the air within the shroud with helium gas.
Helium concentrations inside the shroud will be measured using a helium gas detector. Using a
syringe and three-way valve, the Teflon tubing and surrounding sand pack will be purged of
approximately three volumes. Following purging, a sample will be collected from the sample
tubing outside the shroud and analyzed using the helium gas detector to ensure that helium
concentrations are less than 10% of the helium concentrations in the shroud.
Following a successful leak check, a laboratory-supplied 6-liter stainless steel Summa sample
canister connected to in-line flow controllers with a vacuum gauge. The flow controller will be
connected to the sample tubing at each sampling point using a brass nut and ferrule assembly to
form an air-tight seal. The flow regulator will be pre-set by the laboratory to regulate the vapor
intake rate to 6-liters per hour. Once the sample train is assembled, the intake valve on the
canister will be fully opened to begin collection of the SSV sample. Vacuum readings on the
Summa canister will be recorded prior to and following the one-hour sampling period to ensure
adequate sample volume was collected. A vacuum will be maintained within the canisters at the
conclusion of the sampling event.
After sample collection, the Summa canister’s valve will be closed, and the regulator will be
disconnected from the canister. The canisters will be placed in laboratory supplied shipping
containers, properly labeled and shipped under standard chain-of-custody protocols to a qualified
Mr. George Newell Whiting, Jr.
September 29, 2017
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laboratory for analysis of VOCs by EPA Method TO-15. The laboratory will be requested to use
reporting limits that are below DEQ DWM Non-Residential Vapor Intrusion Sub-slab and
Exterior Soil Gas Screening Levels (SGSLs).
Upon completion of sampling activities, each SSV boring will be abandoned and the surfaces
were repaired similar to pre-drilling conditions. Each SSV location will be estimated by
measuring from known benchmarks (e.g. doorways, walls, etc.).
2.2.2 Indoor Air Sampling Methodology
In order to collect the indoor air samples under conservative conditions, the samples will be
collected with the windows of the buildings closed and ingress and egress activities minimized.
Because the Site buildings are unoccupied, it is anticipated that the samples will be collected
while the HVAC systems are off.
The background and indoor air samples will be collected using 6-liter stainless steel Summa
sample canisters connected to in-line flow controllers with a vacuum gauge. The flow
controllers will be set so that the samples are collected over an 8-hour period. A 3-foot long
sampling cane will be connected to the flow controller so that the sample intake point is
positioned approximately 5 ft above grade (typical breathing zone height) when the sample
canister is set on its base.
During the sampling activities, indoor/outdoor air pressure differential will be measure near the
start, middle, and end of the 8-hour sampling period using a manometer sensitive to 0.001 inches
of water. In addition, exterior wind speed, exterior wind direction, indoor/outdoor temperature,
and precipitation (if any) will be recorded near the start, middle, and end of the sampling period.
For quality assurance purposes, H&H personnel will be on-Site monitoring the sample canisters
to prevent tampering or damages for the duration of the sampling event. A vacuum will be
maintained within the canisters at the conclusion of the sampling event.
Mr. George Newell Whiting, Jr.
September 29, 2017
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Prior to and after the indoor and background air samples are collected, vacuum in the canisters
will be measured using a laboratory-supplied vacuum gauge and recorded by sampling
personnel. The starting and ending vacuum in each canister will be recorded on the sample
chain-of-custody. The sample canisters will then be labeled and shipped under standard chain-
of-custody procedures to a qualified laboratory for analysis of VOCs by EPA Method TO-15.
The laboratory will be requested to use reporting limits that are below DEQ DWM Non-
Residential Vapor Intrusion Indoor Air Screening Levels (IASLs).
2.3 Quality Assurance – Quality Control
Non-dedicated equipment and tools will be decontaminated prior to use at each boring or
sampling location, or following exposure to soil or groundwater.
Laboratory QA/QC procedures will be employed to ensure appropriate sample handling and
analysis and to aid in the review and validation of the analytical data. QA/QC procedures will be
conducted in accordance with the method protocols and will include regular equipment
maintenance, equipment calibrations, and adherence to specific sample custody and data
management procedures. Samples will be analyzed in conjunction with appropriate blanks,
laboratory duplicates, continuing calibration standards, surrogate standards, and matrix spiking
standards in accordance with approved methodologies to monitor both instrument and analyst
performance. Laboratory reporting limits for each analyte will be at or below appropriate
screening criteria, where possible. Additionally, H&H will request that the laboratory include
estimated concentrations for compounds that are detected at levels above the laboratory method
detection limit but below the laboratory reporting limit.
A hard-copy of the laboratory analytical data report and QA package for each group of samples
submitted to and analyzed by the subcontracted laboratory will be provided in an appendix to the
final report. Laboratory QA data consistent with Level II documentation will be requested for
Mr. George Newell Whiting, Jr.
September 29, 2017
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this project. A copy of the completed chain-of-custody record and shipping receipt will be
appended to the corresponding laboratory analytical report included with the final report.
2.4 Investigation Derived Waste
Investigation derived waste (IDW) generated during the assessment activities will be thin spread
on-Site. However, if significant impacts are suspected, the soil cuttings will be containerized in
55-gallon drums and staged on-Site pending analytical results of a composite IDW sample.
Based on laboratory analytical results of IDW samples, the drums will be transported off-Site to
a suitable facility for disposal.
3.0 Reporting
Following completion of the supplemental assessment activities and receipt of the analytical
data, H&H will document our findings in a Brownfields Assessment Report which will include
the methods and results of the June 2017 assessment activities and those proposed herein. The
report will include a description of the sampling activities, a figure depicting sample locations,
soil boring and well construction logs, a discussion of the data in comparison to regulatory
screening levels, laboratory analytical data, and conclusions and recommendations concerning
our activities.
Mr. George Newell Whiting, Jr.
September 29, 2017
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We appreciate the opportunity to assist with this project. Should you have any questions or need
additional information please do not hesitate to call us at (704) 586-0007.
Sincerely,
Hart & Hickman, PC
Ralph McGee, PG Steve Hart, PG
Senior Project Geologist Principal
Attachments
TMW-7
SB-15
SB-14
SB-13TMW-6
SB-6
SB-8
SB-9
SB-4/
TMW-4
SB-10 SB-11 SB-7
TMW-3
SB-12
SB-3
TMW-2
SB-2
SB-1/
TMW-1
SB-5/
TMW-5
SB-16
SB-17
SB-7A
BKG-1
BKG-2
BKG-3
REVISION NO. 0
JOB NO. BRN-002
DATE: 9-29-17
FIGURE NO. 1
BERRYHILL ROAD & THRIFT ROAD II SITES
CHARLOTTE, NORTH CAROLINA
PROPOSED SAMPLE LOCATION MAP
LEGEND
BERRYHILL ROAD SITE PROPERTY
BOUNDARY
THRIFT ROAD II SITE PROPERTY
BOUNDARY
ADJACENT PARCEL BOUNDARY
CONTAINMENT AREA 1
CONTAINMENT AREA 2
CONTAINMENT AREA 3
FORMER 20,000-GALLON
UNDERGROUND STORAGE TANK
FORMER ABOVEGROUND STORAGE
TANK
TEMPORARY MONITORING WELL
TEMPORARY MONITORING WELL/ SOIL
BORING LOCATION
SOIL BORING LOCATION
PROPOSED SHALLOW SOIL SAMPLE
LOCATION
PROPOSED INDOOR AIR SAMPLE
LOCATION
PROPOSED SUB-SLAB VAPOR SAMPLE
LOCATION
NOTE:
AERIAL IMAGERY OBTAINED FROM MECKLENBURG COUNTY
GIS DEPARTMENT (2017).
CSX ROW
TRACT THRIFT
ROADBERRYHILL ROAD(1225)
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
FORMER BUILDING FOOTPRINT
FORMER LOADING DOCK
4
31
5
2
IAQ-1
IAQ-3
IAQ-2
IAQ-4
SSV-3
SSV-1
SSV-2
SSV-4
\\hhfs01.harthickman.local\masterfiles\AAA-Master Projects\Brownstone Properties - BRN -Thrift Road Brownfields\BRN-002\Figures\Sample Location Map.dwg, PROP, 9/29/2017 4:03:01 PM, zbarlow