22074 Gathing Motor WP-DEQ Approval Soil Char East piling 20191220

December 20, 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 (East 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 Work Plan for Soil Characterization for Beneficial Reuse Foundation Soil (East Office Building) dated December 18, 2019 for the above referenced Brownfields Property. DEQ Brownfields reviewed this document and approves the work plan with the revised soil boring placement dated December 20, 2019.
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
December 18, 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 (East 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 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).
Under separate work plans, Wood preformed shallow and deep soil characterization of soil that was to be
generated during the construction of the proposed West Office Tower in the northern corner of the
subject property and the parking garage in the southern portion of the subject property.
Work Plan for Soil Characterization December 18, 2019
Wood Project: 6228-18-0495
2
Under a separate work plan (dated November 26, 2019), Wood recently performed soil characterization of
shallow soil that will disturbed during planned grading activities to prepare a building pad for the
proposed East Office Tower in the near future.
This work plan is prepared to outline the scope and methods to be implemented in characterization of
deep soil to be disturbed during foundation drilling for the East Office Tower.Based on the information
provided for the West Office Tower, Wood estimates that approximately 5,000 cubic yards of soil will be
generated during construction of piles that will be drilled during “deep”foundation construction. The
approximate 2-foot diameter shafts will be filled with cement. During drilling of the boreholes for the
piles, it is estimated that approximately 5,000 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.
Wood personnel were later provided with information from the construction team that suggested 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 schedule for the foundation drilling
has not been established at this time.
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 Deep Soil Characterization
Wood will retain a direct-push subcontractor to advance 10 soil borings at the locations shown in Figure
2.Our direct-push subcontractor will mobilize a GeoProbe®Model 3230 DT or 8040 DT direct-push rig to
Work Plan for Soil Characterization December 18, 2019
Wood Project: 6228-18-0495
3
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 selected by Wood for the 10 borings are shown generally within
proposed “pile caps”,for which there will be three or more pile shafts drilled because larger volumes of
“cuttings” will be generated.The selected are also “biased” toward the northeastern portion of the
proposed building area since previous exploration in this area identified petroleum-affected soil and
groundwater related to the former Top Gas &Oil (Incident #40460).
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.
Wood’s direct-push subcontractor will advance the soil borings to the depth at which probe refusal is
encountered or to an estimated maximum depth of 70 feet below the existing grade. 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 from each boring. The field screening results for each five-foot depth interval from each
of the 10 borings will be recorded.The soil sample from each boring that exhibited the highest FID
reading will be selected as the one “discrete” sample to be retained for laboratory analysis for VOCs using
EPA Method 8260.A total of 10 soil samples will be retained for VOCs analysis.
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 “discrete” soil samples from each boring.These boring-specific “discrete”
samples will be combined in the laboratory by laboratory personnel as one “composite” sample per
Work Plan for Soil Characterization December 18, 2019
Wood Project: 6228-18-0495
4
boring.Wood estimates a total of 10 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 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 reuse elsewhere.A site map will be provided with the
report.The laboratory data packet will include the applicable Level II QA/QC documentation.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” includes affected soil. Soil analytical results will be
considered representative of the proposed “pile group”from which they were collected. At the request of
Tryon Investors, LLC. The report will be signed and sealed by a North Carolina Licensed Geologist (LG) and
submitted to the NCDEQ BFP for review and approval.
Work Plan for Soil Characterization December 18,2019
Wood Project: 6228-18-0495
FIGURES
USGS The National Map: National Boundaries Dataset, National ElevationDataset, Geographic Names Information System, National HydrographyDataset, National Land Cover Database, National Structures Dataset, andNational Transportation Dataset; U.S. Census Bureau - TIGER/Line; HERERoad Data. Data Refreshed July, 2017.
PREPARED BY: LM DATE: 7/12/2018 DATE: 7/12/2018CHECKED BY: MM
Site Boundary
Document Path: F:\AMEC_Projects\2018\6228-18-0495\MXD\Topo.mxd¯
PROJECT NO: 6228-18-0495 FIGURE NO: 1
SITE TOPOSpectrum South Tryon Parcels South Tryon Street
Charlotte, North Carolina
0 1,000 2,000500Feet
!!!!!!!!!!
PG-30
PG-27PG-26
PG-25
PG-23 PG-24 PG-28
PG-29
PG-22
PG-21
Beneficial Reuse Characterization Foundation Soil(East Office Tower)Former Gathings Motor Company1100-1200 South Tryon StreetCharlotte, North CarolinaBrownfields Project #: 22074-18-060
PROJECT NO.:FIGURE NO.:6228-18-0495 2Reference: Adapted from Foundation Plan S101 Drawing by Moore Linder Engineering, Inc. dated 4/12/2019Document Path: F:\AMEC_Projects\2018\6228-18-0495\MXD\EastOffice.mxd Prepared By: LMM 6/26/19; Checked by AJF 11/18/19
0 20 40 60Feet
¯
TW-1
LEGEND
!A
!A
TW-2
Boring Location!
PG-21
Approximate Proposed Building Footprint
!A Approximate former location of temporary monitoring well (others, 2014)
Potential former fuel dispenser island (others)
Work Plan for Soil Characterization December 18, 2019
Wood Project: 6228-18-0495
TABLE
Boring ID Discrete Soil
Interval in Feet
"Discrete" Sample
IDs
AnalyticalParameters for
"Grab" Samples
"Composite" Sample IDs
Analytical
Parameters
for
"Composite"Samples
TotalNumber of
samples
0 to 55 to 1010 to 1515 to 20
20 to 25
25 to 30
30 to 3535 to 4040 to 4545 to 50
50 to 55
0 to 55 to 1010 to 1515 to 20
20 to 25
25 to 30
30 to 35
35 to 4040 to 4545 to 5050 to 550 to 55 to 1010 to 1515 to 2020 to 2525 to 30
30 to 35
35 to 40
40 to 45
45 to 5050 to 550 to 55 to 1010 to 1515 to 2020 to 2525 to 3030 to 3535 to 40
40 to 4545 to 5050 to 550 to 55 to 1010 to 1515 to 20
20 to 2525 to 3030 to 3535 to 4040 to 4545 to 50
50 to 55
0 to 55 to 1010 to 1515 to 20
20 to 25
25 to 3030 to 3535 to 4040 to 45
45 to 50
50 to 55
0 to 55 to 1010 to 1515 to 2020 to 2525 to 3030 to 35
35 to 40
40 to 45
45 to 5050 to 550 to 5
5 to 1010 to 1515 to 2020 to 2525 to 30
30 to 35
35 to 40
40 to 4545 to 5050 to 550 to 55 to 1010 to 1515 to 2020 to 2525 to 3030 to 3535 to 4040 to 45
45 to 50
50 to 550 to 5
5 to 10
10 to 15
15 to 20
20 to 2525 to 30
30 to 35
35 to 40
40 to 45
45 to 5050 to 55
Prepared By:MAS 12/18/19Checked By:AJF 12/18/19Field screening of soil samples will be performed using a Foxboro Thermo TVA 1000 with Flame Ionization Detector
VOC - Volatile Organic Compounds
SVOC - Semi Volatile Organic Compounds
OVA/FID - Organic Vapor Analyzer/Flam Ionization DetectorOne duplicate sample per day will be collected and analyzed
1 VOC Sample per
boring chosen
based on field
screenings with
OVA/FID
1 VOC Sample per
boring chosenbased on field
screenings withOVA/FID
PG-23-"Depth"
PG-24-"Depth"
Notes:ppm - parts per million
PG-23
PG-26 PG-26-"Depth"
PG-27-"Depth"
PG-29 PG-29-"Depth"
PG-24
PG-25 PG-25-"Depth"
1 VOC Sample per
boring chosen
based on field
screenings with
OVA/FID
PG-27
Table
Sampling and Analysis Plan
Foundation Soil (East Office Tower)
Former Gathings Motor CompanyCharlotte, North CarolinaBrownfields Project No. 22074-18-060Wood Project: 6228-18-0495
SVOCs and
Metals
(1 Sample)
1 VOC
1 Composite
SVOCs and
Metals
PG-22
SVOCs and
Metals
(1 Sample)
1 VOC
1 CompositeSVOCs and
Metals
PG-21-"Depth"
SVOCs and
Metals
(1 Sample)
1 VOC
1 CompositeSVOCs and
Metals
PG-22-"Depth"
1 VOC Sample perboring chosen
based on field
screenings with
OVA/FID
1 VOC Sample perboring chosen
based on field
screenings with
OVA/FID
Comp-PG-21
Comp-PG-22
PG-21
1 VOC Sample per
boring chosen
based on field
screenings withOVA/FID
1 VOC1 Composite
SVOCs and
Metals
1 VOC1 Composite
SVOCs and
Metals
1 VOC
1 Composite
SVOCs and
Metals
SVOCs andMetals
(1 Sample)
Comp-PG-23
SVOCs and
Metals
(1 Sample)
1 VOC
1 Composite
SVOCs andMetals
1 VOC1 Composite
SVOCs andMetals
1 VOC
1 Composite
SVOCs and
Metals
1 VOC
1 CompositeSVOCs and
Metals
Comp-PG-24
Comp-PG-25
Comp-PG-26
SVOCs and
Metals
(1 Sample)
1 VOC Sample per
boring chosenbased on field
screenings with
OVA/FID
Comp-PG-27 SVOCs andMetals
(1 Sample)
PG-28 PG-28-"Depth"
1 VOC Sample perboring chosen
based on field
screenings withOVA/FID
Comp-PG-28
SVOCs and
Metals
(1 Sample)
1 VOC Sample per
boring chosen
based on field
screenings with
OVA/FID
Comp-PG-29
SVOCs and
Metals
(1 Sample)
PG-30 PG-30-"Depth"
1 VOC Sample per
boring chosen
based on field
screenings with
OVA/FID
Comp-PG-30
SVOCs and
Metals
(1 Sample)