Document jBm88jyerG5g3jVmDgxDbKod9
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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
Document Processing Center (Mail Code 7407M) Room 6428 Attention : 8(e) Coordinator Office of Pollution Prevention and Toxics U.S. Environmental Protection Agency 1201 Constitution Ave., NW Washington, DC 20004
Dear 8(e) Coordinator :
Re: 8EHQ-06-16446 Perfluorooctanoate Anion (PFOA) Updated Occupational Serum Sampling Experimental Station, Wilmington, Delaware
Please find attached occupational PFOA serum sampling results for workers at the above referenced DuPont site for 2008. The levels of PFOA reported with this submission are genet ly corroborative of previously reported levels in an occupational setting. This information is * provided to the TSCA 8(e) office in view ofthe Agency's continued interest in perfluoinat4~sbce
and as a precautionary measure .
Sincerely,
A. Michael Kaplan, Ph.D. Director - Regulatory Affairs
AMK/BJD/JLC : clp (302) 366-5260
Attachment (4 pages)
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DuPont Company Experimental Station, Wilmington, Delaware Summary of Serum PFOA Monitoring Results
Samples Collected in November 2008
Number of Samples Average (ppb) Median (ppb) Minimum (ppb) Maximum (ppb)
~Standard Deviation
Samples 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
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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 Avera ge Median Minimum Maximum
Standard Deviation Analytical Laborato ry
Results* (ppb) 23
1480 112
1780 638
Results**
(ppb) 7 83
1109
679 144
17 6
78 14 545
54
225
6
11
681
264
375
83
23
6
1780
1109
774
361
Ax s
MPI
Results
(ppb) 53 78
1350 1480
196
12 10 190 25
719 693 249
12 421 193
10 1480
525 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 .
Results rounded to nearest whole number
Barbara J. Dawson, CIH, CSP January 13, 2009
p. 4
DuPont Company Experimental Station, Wilmington, Delaware Serum PFOA Monitoring Results - Group 2
Samples Collected November 2008
Sample
Number 1 2 3
Number of Samples Average Median Minimum Maximum
Standard Deviation Analytical Laborato .
Sample Collection Time Period 2007 Apr 2008 Nov 2008
Results* (ppb) 5 47
2 26 26
5 47 30 Ax s
Results** (ppb)
5 41
7
3 18 7 5
41 20 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 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 .
Results rounded to nearest whole number
Barbara J . Dawson, CIH, CSP January 13, 2009
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DuPont Company Experimental Station, Wilmington, Delaware Serum PFOA Monitoring Results - Group 3
Samples Collected in November 2008
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* (ppb)
1330 201
2 766 766 201 1330
Results**
(ppb) 137 99 5 140
7 10
6 66 55
5 140
798
66
Ax s
MPI
Results (ppb)
244 186 1270 227
8 11 6 324 207 8 1270
475 Ax s
*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 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 .
Results rounded to nearest whole number
Barbara J. Dawson, CIH, CSP January 13, 2009