DuPont Corporate Remediation Chestnut Run Plaza, Building 715 4417 Lancaster Pike

Docket No. OPPT-2004-0113 September 10, 2012 EPA-DuPont MOU

Page 1 of 1 OPPT-2004-0113 PFOA Site-Related Environmental Assessment Program September 10, 2012

Director, Chemical Control Division (7405M) Document Control Office Room 4146 EPA East Office of Pollution Prevention and Toxics U.S. Environmental Protection Agency EPA East, Room 6428 1201 Constitution Avenue, NW U.S. Environmental Protection Agency Washington, DC 20004 1201 Constitution Avenue, NW 202-564-4760 Washington, DC 20004 202-564-8930

Attn: EPA Docket ID Number OPPT-2004-0113 Memorandum of Understanding (MOU) between the U.S. Environmental Protection Agency (EPA) and E. I. DuPont de Nemours and Company (DuPont) for a Perfluorooctanoic Acid (PFOA) Site-Relat ed Environmental Assessment Program (November 3, 2005)

Re: Table 2.2 - Quarterly MOU Status Report #5 Phase III – Future Work Plan, DuPont Washington Works (May 3, 2012)

Dear Sir/Madam:

The Quarterly MOU Status Report #5 Phase III – Future Work Plan was submitted on May 3, 2012, in accordance with Section V.F.2 of the a bove-identified MOU. A footnote for Table 2.2 was inadvertently omitted which states that only two of the 65 produce samples collected in Ohio had measurable concentrations of PFOA, with the concentrations as shown in the table. The other 63 produce samples collected in Ohio were non-detect with the limit of detection ranging from 0.44 ug/kg to 0.52 ug/kg. This footnote has been added to Table 2.2, which is attached in hard copy. In addition, a digital co py of this table is also attached.

If you need any additional information or further clarification, please contact me (302-999-6197) or Jenny Liu (302-999-3628).

Very truly yours,

Andrew S. Hartten Principal Remediation Project Manager

Attachment: Hard and digital copy of Table 2.2 for the Quarterly MOU Status Report #5 Phase III – May 3, 2012

### Table 2.2 Phase III Multi-media Sampling Results, Ohio Quarterly MOU Status Report #5 Phase III - Future Work Plan DuPont Washington Works (OPPT-2004-0113)

Media Sample ID Date APFO (ug/L) PFOA (ug/L) OH-1 8/2/11 ND (0.0034) ND (0.0034) OH-3 8/3/11 2.2 2.1 OH-12 8/3/11 10 10 OH-13 8/10/11 ND (0.0034) ND (0.0034) OH-16 8/9/11 NQ (<0.017) NQ (<0.017) Sample ID Date APFO (ug/kg) PFOA (ug/kg) OH-1 8/2/11 3.6 3.5 OH-2 8/3/11 2.4 2.3 OH-3 8/3/11 5.4 5.2 OH-4 8/2/11 2 1.9 OH-5 8/3/11 4.7 4.5 OH-6 8/3/11 8.3 8 OH-7 8/10/11 10 10 OH-8 8/3/11 3 2.8 OH-9 8/12/11 17 16 OH-10 8/4/11 6.7 6.4 OH-11 8/11/11 11 11 OH-12 8/3/11 3.8 3.7 OH-13 8/10/11 2.6 2.5 OH-14 8/4/11 1.7 1.7 OH-15 8/12/11 18.45 17.6 OH-16 8/9/11 13 12 OH-17 8/4/11 3.4 3.3 OH-18 8/10/11 1.7 1.6 OH-19 8/4/11 NQ (<1.9) NQ (<1.9) Sample ID Date OH-8-BEAN 8/3/11 OH-11-BEAN 8/11/11 Beef Tissue** OH-11-BEEF 2/17/12 *All soil results are dry weight corrected.

**All tissue results are “as received.” ^ Only two of the 65 produce samples collected in Ohio had measurable concentrations of PFOA, with the concentrations as shown in the table. The other 63 produce samples collected in Ohio were non-detect with the limit of detection ranging from 0.44 ug/kg to 0.52 ug/kg. ***Produce and beef tissue samples were analyzed as tissues and reported as PFOA by Axys. The perfluoroctanoate ion (PFO-) is detected by the instrument during analysis. PFOA results were not converted to APFO results and tissue samples were not reported as APFO because it is not expected that the perfluorooctanoate ion exists in tissues as APFO. ND (<0.43) Untreated Irrigation water

Soil*

Produce** ^ PFOA (ug/kg)*** 0.89 0.98

09/06/12 1 of 1 Table 2.2