22074 Gathing Motor WP-Approval Piling Soil Char 20190611

June 11, 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 (West Office Building)
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 Revised Work Plan for Soil Characterization for Beneficial Reuse Foundation Soil (West Office Building)
dated June 11, 2019 for the above referenced Brownfields Property. DEQ Brownfields reviewed this document and determined that comments made by DEQ Brownfields to the previous versions of this work
plan have been incorporated as requested. Therefore, DEQ Brownfields 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] Joselyn Harriger [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 11, 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:Revised Work Plan for Soil Characterization for Beneficial Reuse
Foundation Soil (West Office Building)
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 revised 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 11, 2019WoodProject: 6228-18-0495
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will be filled with cement. During drilling of the boreholes for the piles,it is estimated that 1,900
to 2,000 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 soil generated during foundation drilling being field
screened. Based on the 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 samples 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 plan for
soil characterization to be performed prior to the start of foundation drilling. Wood understands
that the foundation drilling is scheduled to begin in early 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 10 soil borings at locations shown on
Figure 1.Representatives of Geologic Exploration will mobilize a GeoProbe®Model 3230 DT
direct-push rig to the site.This rig is 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 location selected by
Wood for the 10 borings are shown within proposed “pile caps”where five or more pile shafts
Work Plan for Soil Characterization June 11, 2019WoodProject: 6228-18-0495
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will be drilled since those areas represent areas from which larger volumes of “cuttings” will be
generated.The purpose of the soil characterization is to evaluate if 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 Carolina811
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.
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 65 to 70
feet below existing grade.Soil cores will be removed from the disposable liners, and visual and
olfactory observations relative to the soil samples will be recorded by our field personnel. The
soil types encountered in the borings will be recorded to prepare 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 the 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’s
environmental professional or environmental technician 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 to collect one “discrete” soil sample for laboratory analysis of VOCs
for each day of probing.The field screening results for each depth interval from each of the 10
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.
Regarding the samples to be retained for analysis of SVOCs and total metals, representative
portions of each five-foot soil core collected from each boring will be placed into laboratory
containers by Wood personnel.Wood personnel will group the “discrete” soil samples based on
Work Plan for Soil Characterization June 11, 2019WoodProject: 6228-18-0495
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the date of field collection.These “discrete” samples will be combined in the laboratory by
laboratory personnel as one “composite” sample per day of probing. 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 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. 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.One trip blank for VOC analysis is proposed.
Following the completion of the soil sampling activities, the borings will be backfilled with the
soil cores and/or bentonite to the ground surface.
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. A site map and
subsurface profile drawings will be provided with the report. The purpose of the report will be to
provide data in a manner that will allow Tryon Investors, LLC, and grading contractor to evaluate
the location and depth of “non-contaminated” soil that may be suitable for beneficial reuse
elsewhere.The report will include a comparison of the results to the IHSB, PSRGs and a graphical
presentation of the analytical data on site drawings to illustrate which “pile group”(see Figure
1)include “non-contaminated” soil.Soil analytical results will be considered representative of
the proposed pile group which they are located within.At the request of Tryon Investors, LLC.
The report will be submitted to the NCDEQ BFP for review and approval.
Work Plan for Soil Characterization June 11, 2019WoodProject: 6228-18-0495
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NC Center for Geographic Information & Analysis
Soil Characterization for Beneficial Reuse (West Office Tower)Former Gathings Motor Company1100-1200 South Tryon StreetCharlotte, North CarolinaBrownfields Project #: 22074-18-060
PROJECT NO.:FIGURE NO.:6228-18-0495 1Document Path: F:\AMEC_Projects\2018\6228-18-0495\MXD\GEORef.mxd Prepared By: LMM 6/6/19; Checked by RCF 6/6/19
0 25 50 75Feet
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Pile Group (PG)
H
Approximate Proposed Building Footprint
Proposed Boring Location!PG-1
LEGEND