DEQ-CFW_00043802

Hazardous Waste Section
File Room Document Transmittal Sheet
M
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Larry Stanley
NCD047368642
Chemours
Corrective Action (CA)
Other (0)
PFC groundwater sampling program
6/30/2015
Chemours
File Room Use Only 1 NCD047368642
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DEQ-CFW-00043802

Chemours Company — Fayetteville Works
22828 NC Highway 87 West
Fayetteville, NC 28306-7332
CERTIFIED MAIL ARTICLE N UMBER 7007 0710 0005 1455 9911
RETURN RECEIPT REQIJESTED
June 30,2015
Mr. Larry Stanley
NC DENTR Hazardous Waste Section
1646 Mail Service Center
Raleigh, NC 217699-1646
SUBJECT: Supplemental Sampling Work Plan
I
Chemours Company — Fayetteville Works
Permit No. N CD 047 368 642
Dear Mr. Stanley:
Enclosed is a Supplemental Sampling Work Plan for conducting a groundwater investigation to
confirm the absence of three compounds of interest at concentrations that would be detectable in
the Cape Fear River.
Please feel free to call me at 910-678-1155 if you have airv, atiestions.
Environmental Manager
Enclosure
cc. Kevin Garon, Cheniours CRG, Charlotte
DEQ-CFW-00043803

4701 Hedgemore. Drive * Cfaadoc t , NoWi Carob ina 2820E a [phone] « Fax [phone]
TECHNICAL MEMORANDUM
Date: May 19, 2015
To: Michael Johnson, Chemours Company
From: Tracy Civbey
Subject: Supplemental Sampling Work Flan
Chemo rs Company — Fayetteville Works Facility
Fayetteville, North Carolina
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This work plan was developed to describe and provide the methodology for Supplemental
groundwater
sampling that will be conducted S gather additional data oselection
o
monitoring wells near Willis Creek and the Cape Fear River. The first section of this work plan
describes the hydraulic modeling that was conducted to determine the dilution associated with
the reporting g :: : that will be used by the laboratory during analysis of the supplemental
groundwater samples. The next section of the work plan details the field sampling and
analytical laboratory methods that the field team and laboratory personnel will follow. The
Data Evaluation section outlines how data will be analyzed. The Reporting section escri es
how
.:e results and conclusions will be presented. References
ti:. a in the preparation of this
document are itcluded ituNte final section.
DEQ-CFW 00043804

TECHNICAL MEMORANDUM
SUPPLEMENTAL SAMPLING WORK ELAN - CHEMC ORS FAYETTEVILLE WORKS FACILITY
Page 2
To determine Whether the rimer Water concentrations of C4, C5, and C7 reported in 2005
could potentially have been a result of groundwater discharge from the Site, groundwater
samples Will be collected from five existing monitoring Wells in the Site's monitoring well
network (Figure 3). Samples Will be collected from the three northernmost monitoring wells
( MW-10, MW-11, and SMW-12) located near Willis Creel. In addition, groundwater
samples Will be collected at two locations along the river -front property boundary (LTW-02
and LTW-05), The samples Will be collected in accordance with the procedures described in
the Sampling and Analysis Plan that Was presented in Section 4.2 of the approved Phase 111
RCRA Facility Investigation Work Plan (Parsons 2011).
In carder to avoid a true detection of the C4, COB or C7 compounds, Which is neither the intent
nor goal of this voluntary groundwater monitoring, the three compounds Will be analyzed in
groundwater samples With the analyte reporting limit (Le., practical quantitation limit) set equal
to 1,000 n /L or 1 micrograms per liter (pag/Q. No "estimated" results Will be reported (Le.,
detections above the method detection limit but leas than the practical quantitation limit).
DEQ-CFW 00043805

TECHNICAL MEMORANDUM
SUPPLEMENTAL SAMPLING WORK PLAN --- CHEMOURS FAYETTE`vILLE WORKS FACILITY
Page 3
There are no published NCDENR or DSEPA Regional Screening Levels for C4, C5; or C7;
therefore, analytical results Will be compared against previously detected river water sample
results. If groundwater results are non -detect or less than the previously detected river water
concentrations, then it Will be determined that the detected river Water concentrations could
not have been the result of discharge of Site groundwater to the river.
Upon receipt of the final laboratory analytical data, the project team Will prepare a technical
memorandum describing the supplemental sampling activities. In the memorandum, the
investigation data Will be arranged and presented to facilitate interpretation and understanding
of the data as they pertain to the overall objectives of the investigation. Typical data displays
that will be presented include a tabulation of field measurements and observations and
figure(s) that summarize information as it relates to conditions present at the Site. The
technical memorandum will also summarize the Conclusions derived from the supplemental
sampling activities.
::IF'=::1:R'::::
Parsons. April 2011. Phase I// RCRA Facility Investigation Work Plan (Rev. 1).
Parsons. August 2014. Final RCRA Facility Investigation Report (Rev. 1).
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DEQ-CFW 00043806

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DEQ-CFW 00043807

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DEQ-CFW-00043808

DEQ-CFW 00043809