DEQ-CFW_00042502

WJ
OR,
DuPont Engineering
Mr. Larry Stanley
Division of Waste Manavement
"91TI" I " rimm, I 1A M-Y"
and Natural Resources
1646 Mail Service Center
Raleigh, NC 27699-1646
Phase 11 RCRA Facility Investigation
Y61)uPont Fayetteville Works
**EPA ID No. NCD 047 368 642
Dear Mr. Stanley:
DuPont Engineering
6324 Faimiew Road
Charlotte, NC 29210
Tel. [phone]
Fax [phone]
M
January 3, 2007
As discussed in Section 4.0 of the Revised Phase 11 Work Plan Update (December 16, 2005)
and Section 3.2 of the Phase 11 RF1 Report (June 30, 2006), DuPont was unable to sample
monitor wells NAF-05A and NAF-05B due to the location of these wells within the Naflon(2)
area exclusion zone until the area annual shut down. On October 19, 2006, DuPont sampled
these wells during the annual area shut down. At the time of the sampling event, monitor well
NAF-05B was dry and was therefore not sampled.
The enclosed table (Table 1) summarizes the analytical detections associated with groundwater
samples collected from monitor well NAF-05A As depicted inthe table only two -of the 22
constituents detected exceeded the applicable groundwater screening criteria. DuPont will add
this data to the existing groundwater database and update the site conceptual model as
appropriate in the next phase of investigation. If you have any questions, please do not hesitate
to contact me at [phone].
�S�ince ly,
U,
Jarnie Van Buskirk
DuPont CRG Project Director
Cc: Mr. Michael Johnson, DuPont Fayetteville Works
DEQ-CFW-00042502

Table 1
Monitor Well NAF-05A Groundwater Detections
DuPont Fayetteville Works
October-06
Constituent
Concentration
Screening
Criteria
APFO
0.16
2
1,2-DICHLOROETHANE
0.17 J
0.38
CHLOROFORM
0.61 B
70
CIS-1,2 DICHLOROETHENE.
0.54
70
ETHENE
0.49 J
NA
METHANE
13
NA
TETRACHLOROETHYLENE
0.7
TRANS-1,2-DICHLOROETHENE
0.14 J
100
TRICHLOROETHENE
0.34 J
2.8
PHENOL
1.6 B
300
CALCIUM
946 J
NA
IRON
44.5 J
300
MAGNESIUM
404 J
NA
MANGANESE
21
50
POTASSIUM
50500
NA
SODIUM
21600
NA
ALKALINITY, BICARB. AS CAC03 AT PH 4.5
7380 B
NA
AMMONIA
109 B
NA
CHLORIDE
44900
250000
FLUORIDE
ffilaw$p"M
2000
SULFATE
24400
250000
TOTAL ORGANIC CARBON
4960 J
NA
Data presented in mircograms per liter (ug/1)
Groundwater samples collected on October 19, 2006
Screening criteria based on available NC 2L groundwater standards
and NC Interim groundwater standards.
Shaded cells indicate a screening criteria exceedance.
NA - NC groundwater standard not available
J - Constituent detected between MDL and POI and considered an estimated concnetration,
B - Constituent also detcted in method blank
Page 1 of 1
DEQ-CFW-00042503