Document RjmKbmLa37N29ev9KJqQeZ7nv
P-1
January 15, 2009
DuPont Haskell Global Centers for Health and Environmental Sciences 1090 Elkton Road, P.O. Box 50 Newark, DE 19714-0050
Via Federal Express
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Dear 8(e) Coordinator:
Re: 8EPUEexprHpdfelaQurtioe-m0dr6oeO-on1cct6tac4alu4nSp6otaaatttieioonAna,nlWiSoenilrmu(PmiFngOStaAomn),pDlinelgaware
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Sincerely,
4?( AD.irMecitcohra-elRKegapullaanto, rPyhA.Dff.airs A(3M02K)/3B6J6D-5/J2L6C0: cip Attachment (4 pages)
CONTAINS NO CH
DuPont Company Experimental Station, Wilmington, Delaware Summary of Serum PFOA Monitoring Results
Samples Collected in November 2008
P-2
Number of Samples Average (ppb) Median (ppb) Minimum (ppb) Maximum (ppb) Standard Deviation
San'lpies Collected
in November 2008
Group 1 Group 2 Group 3
12 3 6
421 20 324
193 18 207
10 5 8
1480
38 1270
525 17 475
Samples analyzed by Axys Laboratory, Sydney, British Columbia, Canada Results rounded to nearest whole number
Barbara J. Dawson, CIH, CSP January 13, 2009
DuPont Company Experimental Station, Wilmington, Delaware Serum PFOA Monitoring Results - Group 1
Samples Collected in November 2008
Sample Collection Time Period 2007 Apr 2008 Nov 2008
Sample Number
1 2 3 4 5 6 7 8 9 10 11 12
Number of Samples Average Median Minimum Maximum Standard Deviation Analytical Laboratory
Results* Results** Results
(ppb)
(ppb)
(ppb)
23 7
53
83 78
1109
1350
1480
679
1480
112 144
196
17 12
6 10
1780
78
190
14 25
638 545
719
693
54 225
249
6 11
12
681 264
421
375 83
193
23 6
10
1780
1109
1480
774 361
525
Axys
MPI
r
Axys
*Each sample was originally analyzed by Exygen (now MPI). Due to quality control issues, the samples were reanalyzed by Axys laboratory. The Axys results are reported above. The Exygen results for these same samples ranged from 19-1910 ppb, with an average of 543 ppb, and can be provided upon EPA request.
**These samples were analyzed by MPI. Results are provided but, because of quality control issues, another round of samples was collected in November 2008 and analyzed by Axys.
Note: Results for 2007 are provided only in cases where subsequent sampling occurred.
p.3
Results rounded to nearest whole number
Barbara J. Dawson, CIH, CSP January 13, 2009
DuPont Company Experimental Station, Wilmington, Delaware Serum PFOA Monitoring Results - Group 2
Samples Collected November 2008
P-4
Sample Collection Time Period 2007 Apr 2008 Nov 2008
Sample Number
1
2
3
Number of Samples Average Median Minimum Maximum Standard Deviation Analytical Laboratory
Results* Results**
(PPb)
(ppb)
55
4 7 41
7
23
26 18
26 7
55
47 41
30 20
Axys
MPI
Results (PPb)
5 38 18
3 20 18
5 38 17 Axys
*Each sample was originally analyzed by Exygen (now MPI). Due to quality control issues, the samples were reanalyzed by Axys laboratory. The Axys results are reported above. The Exygen results for these same samples ranged from 5-50 ppb, with an average of 27.5 ppb, and can be provided upon EPA request.
**These samples w ere analyzed by MPI Results are provided but, because o f quality control issues, another round of samples was collected in November 2008 and analyzed by Axys.
Note: Results for 2007 are provided only in cases where subsequent sampling occurred.
Results rounded to nearest whole number
Barbara J. Dawson, CIH, CSP January 13, 2009
DuPont Company Experimental Station, Wilmington, Delaware Serum PFOA Monitoring Results - Group 3
Samples Collected in November 2008
P-5
Sample Collection Time Period 2007 Apr 2008 Nov 2008
Sample Number
1 2
3
4
5 6
Number of Samples Average Median Minimum Maximum Standard Deviation Analytical Laboratory
Results* Results**
(ppb)
(PPb)
137
99
1330
5
201 140
7
10
26
766 66
766 55
201 5
1330
140
Results (PPb)
244 186 1270 227
8 11 6 324 207
8 1270
798 Axys
66 MPI
475 Axys
` Each sample was originally analyzed by Exygen (now MPI). Due to quality control issues, the samples were reanalyzed by Axys laboratory. The Axys results are reported above. The Exygen results for these same samples ranged from 276-1920 ppb, with an average of 1098 ppb, and can be provided upon EPA request.
" These samples w ere analyzed by MPI. Results are provided but, because o f quality control issues, another round of samples was collected in November 2008 and analyzed by Axys.
Note: Results for 2007 are provided o n ly in c a se s w h e re subsequent sam pling occurred.
Results rounded to nearest whole number
Barbara J. Dawson, CIH, CSP January 13, 2009
