DEQ-CFW_00025306

Hazardous Waste Section
File Room Document Transmittal Sheet
Your Name: Larry Stanley
EPA ID: N C D 0 4 7 3 6 8 6 4 2
Facility Name: DuPont -Fayetteville
Document Group: Corrective Action (CA)
Document Type: Confirmatory Sampling (CS)
Description: Soil sampling at newly discovered release from previously identified
SWMU
Date of Doc: 8/3/2011
Author of Doc: Mike Johnson
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DEQ-CFW-00025306

DuPont Fluoroproducts
Fayetteville Works Plant
22828 NC Highway 87 West
Fayetteville, NC 28306-7332
August 3, 2011
Ms. Elizabeth Cannon
N.C. Hazardous Waste Section Chief
NCDENR — Division of Waste Management
1646 Mail Service Center
Raleigh, NC 27699-1646
Attn: Mr. Larry Stanley
SUBJECT: Newly Discovered Release from Previously Identified SWMU — Addendum
DuPont Company — Fayetteville Wnrl�s
Hazardous Waste Management Permit No. NCD 047 368 642
Dear Ms. Cannon:
On July 18, 2011, the DuPont Company — Fayetteville Works notified the NCDENR
Hazardous Waste Section of a potential newly discovered release of hazardous constituents
from a previously identified solid waste management unit ("SWMU"). The source of this
potential release was a compromised process wastewater trench in the Butacite* Flake
Manufacturing Building that was discovered on July 9, 2011.
This trench is part of the Process Sewer System (SVVIMU 6) that is already identified in the
current Part B permit.
A review of the hazardous constituents listed in 40 CFR 261 Appendix VIII versus the
Butacite(M manufacturing process showed the only potential compounds that could be present
in the released wastewater would be heavy metals from the process equipment itself. On
July 9, 2011, soil samples were taken from the compromised trench and analyzed for the
metals listed as hazardous constituents per 40 CFR 261 Appendix VIII. The results of those
analyses are shown on Table 1.
E.I. du Pont de Nemours and Company
DEQ-CFW-00025307

Ms. Elizabeth Cannon
NCDENR — Hazardous Waste Section
August 3, 2011
Of the eleven individual metals analyzed, only lead was quantifiable at 2.48 mg/kg. However
that concentration is in the range of soil samples taken at various locations on this site and
analyzed in 1998 and 1999. The average concentration of 41 soil samples was 4.92 mg/kg
lead.
Four other metals, namely barium, chromium, mercury, and nickel, were above the method
detection limit but were less than the limit of quantification for each of the respective
analytical methods. However, in all four cases the estimated values were less than the average
soil concentrations found during the 1998 and 1999 sampling activities.
All other metals were not detectable.
If you should have any questions or need additional information, feel free to call me at
[phone].
Environmental Manager
Attachment
cc: Mr. Jamie VanBuskirk, DuPont Remediation Group, Charlotte, NC
DEQ-CFW-00025308

CAS NO.
Analyte
Soil Conc.
(mg/kg)
MDL
(mg/kg)
Background*
(mg/kg)
7439-92-1
Lead
2.48
0.0593
4.92
7440-39-3
Barium
2.45 (J)
0.514
<15.8
7440-47-3
Chromium
3.12 (J)
0.696
10.62
7439-97-6
Mercury
0.0099 (J)
0.00717
<0.016
7440-02-0
Nickel
1.40 (J)
0.112
2.69
7440-36-0
Antimony
ND
0.537
<0.57
7440-38-2
Arsenic
ND
0.790
<1.1
7440-41-7
Beryllium
ND
0.189
<0.35
7440-43-9
Cadmium
ND
0.155
<0.31
7482-49-2
Selenium
ND
0.612
ND (0.22)
7440-22-4
Silver
ND
0.195
ND (0.18)
MDL = Method Detection Limit
ND = None detected or less than the Method Detection Limit
J = This flag indicates the reported result is an estimated value. The flag is used
when an analyte is detected and the result is less than the adjusted Reporting
Limit or Limit Of Quantification, but equal to or greater than the MDL.
Background concentrations are the average analytical results of various site soil
samples analyzed in September 1998 and March 1999 for the specific metals shown
DEQ-CFW-00025309