22074 Gathing Motor WP-App Soil Char Parking Garage 20190614

June 14, 2019

Sent Via E-Mail

Robert C. Foster
Wood Environmental & Infrastructure Solutions, Inc. 2801 Yorkmont Road, Suite 100
Charlotte, North Carolina 28208 [e-mail]
Subject: Brownfields Work Plan Approval-Soil Characterization
Foundation Soil (Parking Garage)
Former Gathings Motors Brownfields Property Charlotte, Mecklenburg County
Brownfields Project No. 22074-18-060
Dear Mr. Foster,
The Department of Environmental Quality (DEQ) Brownfields Program received the Work Plan for Soil Characterization for Beneficial Reuse Foundation Soil (Parking Garage) dated June 14,
2019 for the above referenced Brownfields Property. DEQ Brownfields reviewed this document and approves the work plan.

Please be advised that this approval from DEQ Brownfields does not waive any applicable requirement to obtain any necessary permits, licenses or certifications which may be required from other
state or local entities. If you have questions about this correspondence or require additional information,
please feel free to contact me by phone at 704/661-0330 or by email at [e-mail]
Sincerely, Carolyn Minnich
Carolyn Mininch Brownfields Project Manager
ec: Fish, Jason [e-mail] Franchina, David A. [e-mail]
Wood Environment & Infrastructure Solutions, Inc.
2801 Yorkmont Road, Suite 100
Charlotte, North Carolina 28208
Licensures: NC Engineering F-1253, Geology C-247
T: 704-357-8600
www.woodplc.com
‘Wood’ is a trading name for John Wood Group PLC and its subsidiaries
June 14, 2019
Ms. Carolyn Minnich, Brownfields Project Manager
North Carolina Department of Environmental Quality
Division of Waste Management
Brownfields Program
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Subject:Work Plan for Soil Characterization for Beneficial Reuse
Foundation Soil (Parking Garage)
Former Gathings Motor Company
1100 and 1200 South Tryon Street
Charlotte, North Carolina
Brownfields Project Number 22074-18-060
Wood Project No: 6228-18-0495
Dear Ms. Minnich:
Wood Environment & Infrastructure Solutions, Inc. (Wood) is pleased to submit this Work Plan
outlining activities proposed for the above-referenced site. Included in this Work Plan is an
outline of our understanding of the project information, our proposed scope of services and
schedule.
PROJECT INFORMATION
On behalf of Tryon Investors, LLC,Wood recently performed Brownfields Assessment work at
the subject properties consisting of four parcels encompassing approximately 4.9 acres situated
at the intersection of South Tryon Street and West Carson Boulevard (Figure 1).
The Prospective Developer (PD) provided information regarding the location and diameter of
piles that will be drilled during foundation construction. The approximate 2-foot diameter shafts
Work Plan for Soil Characterization June 14, 2019WoodProject: 6228-18-0495
2
will be filled with cement. During drilling of the boreholes for the piles, it is estimated that
approximately 2,000 to 3,000 cubic yards of soil, weathered rock and possibly bedrock will be
removed. Wood is presently evaluating potential export options for the material to be generated
during foundation construction. Wood prepared an Environmental Management Plan (EMP),
which was approved by the North Carolina Department of Environmental Quality (NCDEQ),
Division of Waste Management (DWM),Brownfields Program (BFP) on April 25, 2019. The EMP
specified a plan for field screening and analytical characterization of the material to be
generated during foundation drilling. The EMP was based on the scenario that soil generated
during foundation drilling would be field screened. Based on this field screening, samples of soil
would be retained for analysis of Volatile Organic Compounds (VOCs). Subsequently, the soil
“cuttings” would be stockpiled at the site and one composite sample of soil was to be collected
per every 1,000 cubic yards for analysis of Semi-Volatile Organic Compounds (SVOCs) and
metals.
However, Wood personnel have since been provided with information from the construction
team that suggests field screening and analytical characterization during foundation drilling may
not be feasible due to space and time constraints. Therefore, Wood prepared this work scope
for soil characterization to be performed prior to the start of foundation drilling. Wood
understands that the foundation drilling is scheduled to begin in July 2019.
The proposed assessment activities will be performed in general accordance with the most
recent Inactive Hazardous Sites Branch (IHSB) Program Guidelines for Assessment and Cleanup
(http://portal.ncdenr.org/web/wm/sf/ihs/ihsguide), dated October 2015 and the most recent
versions of the U.S. Environmental Protection Agency (EPA) Region IV Science and Ecosystem
Support Division (SESD) Field Branches Quality System and Technical Procedures guidance.
PROPOSED SCOPE OF WORK
Task 1 –Beneficial Reuse Soil Characterization
Wood proposes to retain Geologic Exploration to advance 12 soil borings at the locations shown
in Figure 2.Representatives of Geologic Exploration will mobilize a GeoProbe®Model 3230 DT
or 8040 DT direct-push rig to the site. These rigs are capable of advancing the core sample
tubes through weathered bedrock but will likely encounter refusal at the depth of competent
bedrock.The purpose of the borings is to collect representative samples of in-situ soil beginning
at the existing grade to the approximate depths planned for the pile shafts. The locations
Work Plan for Soil Characterization June 14, 2019WoodProject: 6228-18-0495
3
selected by Wood for the 12 borings are shown within proposed “pile caps”, which is where five
or more pile shafts will be drilled and larger volumes of “cuttings” will be generated. The
purpose of the soil characterization is to evaluate whether concentrations of contaminants are
identified in the soil, to be exported,that exceed the Inactive Hazardous Sites Branch (IHSB)
Preliminary Soil Remediation Goals (PSRGs) for Residential or Protection of Groundwater (PoG).
The boring locations approved by the BFP will be marked in the field and recorded on a hand-
held GPS unit for future reference.
Prior to conducting the soil assessment activities, Wood will contact the North Carolina 811
underground utility location service and a private underground utility locator to perform
Ground-Penetrating Radar (GPR) and Electromagnetic (EM) surveys to attempt to detect metallic
objects such as pipes, tanks or underground utility lines. The purpose of this effort is to
minimize the potential for probing into underground utilities buried at the property.
Based on our previous experience, we estimate three days of probing will be needed to
complete this work.Wood’s direct-push subcontractor will advance the soil borings to the depth
at which probe refusal is encountered. We estimate the average depth of probe refusal will
range from 50 to 70 feet below existing grade.Successive soil cores (five feet in length)will be
removed from the disposable liners, and visual and olfactory observations will be recorded by
our field personnel. The soil types encountered in the borings will be recorded on soil boring
logs.
To select “discrete” samples that will be retained for analysis of VOCs, Wood personnel will don
a new pair of nitrile gloves and split each five-foot long soil core longitudinally. A representative
portion of one-half of the sample will be placed directly in VOC sample containers and a
representative portion of the remaining half will be placed in a re-sealable plastic bag to be
screened in the field using an Organic Vapor Analyzer (OVA) equipped with a flame ionization
detector (FID).Wood personnel will perform the field screening of the headspace vapors in each
bag to evaluate VOCs. The purpose of the screening is to assist with selection of a depth interval
from which to collect one “discrete” soil sample for laboratory analysis of VOCs for each day of
probing. The field screening results for each five-foot depth interval from each of the 12 borings
will be recorded. At the end of each day of probing, the soil sample that exhibited the highest
FID reading will be selected as the one “discrete” sample to be retained for laboratory analysis
for that day for VOCs using EPA Method 8260.Wood estimates a total of three soil samples will
be retained for VOC analysis.
Work Plan for Soil Characterization June 14, 2019WoodProject: 6228-18-0495
4
Following collection of soil designated for VOC analysis, the remaining portions of each five-foot
soil core will be placed into laboratory containers by Wood personnel for SVOCs and total
metals analyses. Wood personnel will group the boring-specific “discrete” soil samples based on
the date of field collection.These boring-specific “discrete” samples will be combined in the
laboratory by laboratory personnel as one “composite” sample per day of probing.Wood
estimates a total of three soil composite soil samples will be retained for SVOC and metals
analysis.Each “composite” soil sample will be placed into laboratory-provided containers for
analysis of SVOCs by EPA Method 8270, and Resource Conservation and Recovery Act (RCRA)
Metals (total) by EPA Method 6020/7471 and Hexavalent Chromium (by Method 7199) to
speciate the identified chromium as either trivalent or hexavalent. The analyzing laboratory will
analyze the samples to meet applicable screening criteria (to the extent feasible) and will include
“j-flag” values or estimated concentrations in their laboratory reports.
The soil samples will be placed in a cooler with ice and shipped to Con-Test Analytical
Laboratory (Con-Test) in East Longmeadow, Massachusetts.Con-Test is certified by the State of
North Carolina (Certification #652).Soil samples will be maintained under a chain-of-custody
protocol. One soil field duplicate QA/QC sample will be collected of field work for analysis of
VOCs, SVOCs and metals. Following the completion of the soil sampling activities, the borings
will be backfilled with the soil cores and/or bentonite to the ground surface.Excess soil cores
generated during these activities will be spread on the ground surface at the subject property.
Wood anticipates a discrepancy between the boring depths achieved by the direct-push rig and
the drilled shafts to be advanced by the foundation drilling equipment. The foundation drilling
equipment will likely advance the pile shaft borehole to depths beyond those achieved by the
direct-push rig. The bedrock material to be generated at the ground surface by the foundation
rig will likely consist of fragments of rock and will likely not be useful for laboratory analysis. For
this reason, Wood proposes that this rock material be excluded from screening requirements
described in the approved EMP.
Task 2 –Prepare Beneficial Reuse Assessment Report
Wood will prepare a Beneficial Reuse Soil Assessment report summarizing the field activities,
results, and conclusions for Tryon Investors, LLC and NCDEQ to review.The purpose of the
report will be to provide data in a manner that will allow Tryon Investors, LLC,and the
construction team to evaluate the location and depth of soil that may be suitable for beneficial
Work Plan for Soil Characterization June 14, 2019WoodProject: 6228-18-0495
6
FIGURE
!!!!!!!!!!!!NC Center for Geographic Information & Analysis
Soil Characterization for Beneficial Reuse (Parking Garage)Former Gathings Motor Company1100-1200 South Tryon StreetCharlotte, North CarolinaBrownfields Project #: 22074-18-060
PROJECT NO.:FIGURE NO.:6228-18-0495 2Document Path: F:\AMEC_Projects\2018\6228-18-0495\MXD\GEORef2.mxd Prepared By: LMM 6/14/19; Checked by RCF 6/14/19
0 20 40 60Feet
PG-11
LEGEND
Approximate Proposed Building Footprint
Proposed Boring Location!PG-11
PG-12
PG-15
PG-14
PG-13
PG-16
PG-17
PG-19
PG-18
PG-21
PG-20 PG-22