16041_Flem_GW Report_2016_05_25

Via Email
May 25, 2016
NC DEQ - Brownfields Program
1646 Mail Service Center
Raleigh, NC 27699-1646

Attention: Ms. Carolyn Minnich
Re: Groundwater Assessment
Fleming Laboratories
Charlotte, North Carolina
Brownfields Project #16041-12-060 H&H Project No. FMG-004

Dear Carolyn:

1.0 Introduction

Hart & Hickman, PC (H&H) is providing this letter documenting groundwater assessment
activities at the Fleming Laboratories site (Brownfields # 16041-12-060) located at
2215 Thrift Road in Charlotte, North Carolina. A site map is included as Figure 1. The
groundwater assessment activities included the installation and sampling of two temporary
monitoring wells. The groundwater assessment activities were conducted in accordance with the
email work plan approved by the North Carolina Brownfields Program on April 8, 2016. The
purpose of the groundwater assessment activities was to evaluate current groundwater
concentrations below the site and the potential for vapor intrusion from identified groundwater
impacts. A summary of the groundwater assessment activities is included below.

2.0 Groundwater Assessment Activities

On April 22, 2016, H&H installed two temporary monitoring wells at the site. One monitoring
well was installed in the asphalt parking lot to the north of the building (TMW-1), and one
monitoring well was installed in the gravel parking lot to the south of the building (TMW-2).
Ms. Carolyn Minnich
May 25, 2016
Page 2

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The locations of the temporary monitoring wells are shown on Figure 2, and the data are
provided in Table 1. Site topography suggests that groundwater flow at the site should generally
be to the south. Therefore, TMW-1 is likely hydraulically upgradient of the building, and TMW-
2 is likely hydraulically downgradient of the building

The monitoring wells were installed using direct-push technology (DPT). Prior to monitoring
well installation, H&H received a Subsurface Investigation Permit (SIP) from Mecklenburg
County. During installation, the recovered soils were described for lithologic purposes and
screened for the presence of organic vapor using a photo-ionization detector (PID). The
temporary monitoring wells were constructed with 15 ft of 1-inch PVC slotted screen and
installed to a depth of approximately 30 ft. Filter sand was installed around the annular space of
the screen to approximately 2 ft above the top of the screen and a 2 ft bentonite seal was installed
above the filter sand. Well construction details are provided in Table 2. Boring logs and wells
construction diagrams are included in Appendix A.

Following installation, the temporary monitoring wells were developed using standard protocol
and sampled using low flow/low stress purging methods. During sampling, each monitoring
well was purged until readings of pH and specific conductivity stabilized and turbidity was
below 10 NTU. Following stabilization, groundwater samples were collected directly into
laboratory provided bottles for analysis of volatile organic compounds (VOCs) by
Environmental Protection Agency (EPA) Method 8260B.

Following sample collection, the monitoring wells were properly abandoned in accordance with
North Carolina guidelines. The monitoring well abandonment record provided by the well
installation contractor is provided in Appendix B. Following receipt of the well abandonment
record, H&H submitted the record to Mecklenburg County and closed the SIP.

Ms. Carolyn Minnich
May 25, 2016
Page 3

S:\AAA-Master Projects\Fleming Labs (FMG)\FMG-004 Brownfields Agreement\Report\Fleming GW Report.docx
3.0 Results

The laboratory analytical results of the groundwater sample collected from the temporary well
located downgradient of the building (TMW-2) indicated concentrations of tetrachloroethene
(PCE) (71 µg/L) and trichloroethene (TCE) (27 µg/L ) above their respective Division of Waste
Management (DWM) Non-Residential Groundwater Screening Levels (GWSLs) for vapor
intrusion of 48.4 µg/L and 4.35 µg/L. The PCE and TCE concentrations also exceed their
respective North Carolina Administrative Code (NCAC) 15A 2L Groundwater Standards
(2L Standards) of 0.7 µg/L and 3 µg/L. In addition, the groundwater sample collected from the
well upgradient of the building (TMW-1) also contained a concentration of PCE (6.9 µg/L) and
TCE (3.9 µg/L) above their 2L Standards, but below their GWSLs. The groundwater sample
collected from TMW-2 also contained 1,1-dichloroethane (7.3 µg/L), 1,2-dichloropropane
(2.5 µg/L), and carbon tetrachloride (1.1 µg/L) above their respective NCAC 2L Standards of
6 µg/L, 0.6 µg/L, and 0.3 µg/L, but below their GWSLs. The groundwater samples collected
from TMW-1 and TMW-2 also contained low concentrations of 1,1-dichloroethene, chloroform,
and/or cis-1,2-dichloroethene below 2L Groundwater Standards and GWSLs. No other VOCs
were detected in TMW-1 or TMW-2 above laboratory detection limits.

4.0 Summary and Conclusions

On April 22, 2016, H&H conducted groundwater assessment activities at the
Fleming Laboratories Brownfields site (Brownfields # 16041-12-060) located at
2215 Thrift Road in Charlotte, North Carolina. The groundwater assessment activities included
the installation and sampling of two temporary monitoring wells. TMW-1 was installed in the
asphalt parking lot to the north of the building, and TMW-2 was installed in the gravel parking
lot to the south of the building. Site topography suggests that groundwater flow at the site should
generally be to the south.

Ms. Carolyn Minnich
May 25, 2016
Page 4

S:\AAA-Master Projects\Fleming Labs (FMG)\FMG-004 Brownfields Agreement\Report\Fleming GW Report.docx
The analytical results of the groundwater sample collected from downgradient temporary
monitoring well TMW-2 indicate the presence of PCE (71 µg/L) and TCE (27 µg/L) above their
respective screening levels for vapor intrusion. The PCE and TCE concentrations also exceed
their respective 2L Groundwater Standards. The groundwater sample collected from upgradient
well TMW-1 contained PCE (6.9 µg/L) and TCE (3.9 µg/L) above their respective
2L Groundwater Standards, but below screening levels for vapor intrusion. The groundwater
sample collected from TMW-2 contained other VOCs above 2L Groundwater Standards, but
below screening levels for vapor intrusion.

Based on the concentrations of PCE and TCE in temporary monitoring well TMW-2, vapor
intrusion assessment for the site building may be warranted.

We appreciate the opportunity to work on this project with you, if you have any questions or
concerns please do not hesitate to contact me.

Sincerely,
Hart & Hickman, PC

Matt Bramblett, PE
Principal

Attachments
Cc: Mr. George Fleming (via email and US Mail) Ms. Amanda Short (via email)
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Table 2 (Page 1 of 1)Hart & Hickman, PC
SITE
0 2000 4000
APPROXIMATE
SCALE IN FEET
N
U.S.G.S. QUADRANGLE MAPS
QUADRANGLE
7.5 MINUTE SERIES (TOPOGRAPHIC)
TITLE
PROJECT
SITE LOCATION MAP
FLEMING LABORATORIES
CHARLOTTE, NORTH CAROLINA
DATE:
JOB NO:
REVISION NO:
FIGURE:
5-6-16 0
1FMG-004
Charlotte East, North Carolina, 1988
2923 S. Tryon Street, Suite 100
Charlotte, NC 28203
704.586.0007(p) 704.586.0373(f)
TMW-2
TMW-1
T
H
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F
T

R
O
A
D
FLEMING
(OPERATING)
JAY S
T
R
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E
T
GRAVEL
PARKING
JOB NO. FMG-004
REVISION NO. 0DATE: 5-12-16
FIGURE NO. 2
LEGEND
SUBJECT PROPERTY BOUNDARY
TEMPORARY MONITORING WELL
LOCATION
FLEMING LABORATORIES
2215 THRIFT ROAD
CHARLOTTE, NORTH CAROLINA
TEMPORARY MONITORING WELL
LOCATION MAP
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
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APPENDIX A
BORING LOGS AND WELL CONSTRUCTION
DIAGRAMS

APPENDIX B
WELL ABANDONMENT RECORD

APPENDIX C
LABORATORY ANALYTICAL DATA

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