DEQ-CFW_00027179

Hazardous Waste Section
File Room Document Transmittal Sheet
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Larry Stanley
N C D 0 4 7 3 6 8 6 4 2
DuPont -Fayetteville
Corrective Action (CA)
RC RA Facility Investigation (RFI)
Second Quarter 2013 Phase III RFI Progress Report
5/28/2013
DuPont-CRG
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DEQ-CFW-00027179

Ms. Elizabeth W. Cannon, Chief
Hazardous Waste Section, Division of Waste Management
North Carolina Department of Environment and Natural Resources
1646 Mail Service Center
Raleigh, NC 27699-1646
RE: SECOND QUARTER 2013 PHASE
LETTER
DUPONT FAYETTEVILLE WORKS
FAYETTEVILLE, NORTH CAROLIN
EPA ID NO. NCD 047 368 642 11
ATT-7313185RIMPFUTOTO
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0 N 11 mill ingsloWIMMIN MEMBRIEM M-n
DuPont Engineering
6324 Fairview Road
Char otte, NC 28210
11 Tel. [phone]
Fax [phone]
=121M
Due to the specific data gaps left in the investigation, certain objectives of the
Phase III RFI had to be completed and the data analyzed prior to the implementation
of the field investigation.for other objectives. The Phase III RFI, therefore, is being
implemented in a "staged" approach. Stage 1 of the investigation consisted of further
delineation of the perimeter of the clay lens in the northern and western portions of
the Site. The Stage 1 field activities were completed in August 2012, and the details
of these activities were presented in a Stage 1 Technical Memorandum submitted to
NCDENR on November 7, 2012.
The Stage 1 investigation results were used to develop the path forward for Stage 2 of
the investigation. Details about the specific activities that are being conducted to
meet the Stage 2 objectives (including providing specific locations where the
proposed new permanent monitoring wells would be installed) were included in the
Stage 1 Technical Memorandum. The memorandum also provided information
pertaining to supplemental activities to be performed during Stage 2 to address
several potential releases to the environment that have occurred at the Site since
March 2011. The Stage 1 Technical Memorandum was approved by NCDENR in a
letter dated December 7, 2012 and serves as an addendum to the approved Phase III
DEQ-CFW-00027180

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May28 2013
^Ms. Elizabeth VV. Cannon
of potential underground obstructions. The geophysical survey was conducted the
week of March 4, 2013. Installation of the proposed additional monitoring wells using
Sonic drilling methods began the week of March 18, 2013 and was completed in Apri!'
2013. A total of thirteen new wells were installed at the Site as part of the Stage 2
During this field mobilization, soil samples were collected from three soil borings in
AOC C (as part of the investigation of the total petroleum hydrocarbons at the Site)
and from one monitoring well installation location (as part of the APFO investigation).
In addition, the investigation of the ethylene glycol release area was conducted and
six piezometers were abandoned.
The supplemental investigative activities that were recommended to address several
potential releases to the environment that have occurred at the Site since March 201
were also completed during this field evont. This effort included the collection of 5
insitu groundwater samples and 8 soil samples. Scopes -of -work (SOWs) for
addressing these releases were presented in the Stage 1 Technical Memorandum
(November 7, 2012) and in the First Quarter 2013 Phase III RFI Progress Report
Update letter (February 26, 2013). The final validated laboratory analytical data from
'these Stage 2 activities have not yet been received by the project team.
The remaining Stage 2 field work will include synoptic gauging of groundwater
elevations from the expanded monitoring well network and sampling of the site -wide
LEIMpated Deviation from the Phase N RF1 Work Plan
The drilling and soil sampling activities conducted during Stage 2 of the Phase III RF1
took longer than originally anticipated in the schedule presented in Section 6.2 of the
approved work plan. This delay was due in part to the expansion of the field activities
to include the supplemental release investigative activities and due to the unknown
geology of several areas, which led to the need for additional drilling, deeper wells,
and installation of deeper surface casing than originally estimated. These slight
delays caused a shift in the field schedule, and the project team has had to move the
groundwater sampling back several weeks. As indicated in a call to Mr. Larry Stanley
on May 22, 2013, the groundwater sampling activities are currently scheduled to
begin the week of June 3, 2013 and will last approximately 3 weeks. According to this
current updated schedule, the final Phase III RFI report will be submitted by January
31, 2014. The updated schedule is shown below:
OEQ-CFVV_00027181

Page 3
Ms. Elizabeth W. Cannon
Activity
Duration
Stage 2 Field Work (well installations, soil and groundwater
Sixteen weeks
sampling)
(currently scheduled to
be completed by the
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
end of June 2013)
Laboratory Analyses/ Data Validation
Eight weeks
Data Evaluation, Final Risk Assessment, and Final RFl
Twenty-four weeks
Report Preparation
(current submittal date
is January 31, 2014)
If you have any questions or comments, please do not hesitate to contact me via
email at Jam ie.A.Vanbuskirka-usa.du pont.com or at [phone]. The Third
Quarter 2013 Phase III RFI Progress Report Update letter will be submitted by August
31,2013.
Jamie VanBuskirk
Project Director, DuPont Corporate Remediation Group
cc: Mr. Larry Stanley — NCDENR, Hazardous Waste Section
Ms. Tracy Ovbey — Parsons Environment & Infrastructure
Mr. Michael Johnson — DuPont Fayetteville Works
File
OEQ-CFVV_00027182