Document dYGmObmeeRYZnX6ZxnEQ9Gj46

3M General Offices = September 21, 2006 3M Center St. Paul, MN 55144-1000 651 733 1110 Off r_ ~00 3_ cr_)fz p. 1 7 06 SEP 2~ P"M 6 : 04 VIA UPS Document Control Office (DCO) Office of Pollution Prevention and Toxics (OPPT) US Environmental Protection Agency EPA East, Room 6428 1201 Constitution Avenue, MW Washington DC 20460 Attention : Docket No. AR-226 and the PFOA Electronic Docket OPPT-2003-0012 Subject: Fourth Submission of Monitoring Data Pursuant to the 3M LOI dated March 13, 2003 and PFOA Users LOI dated March 14, 2003 Dear Sir or Madam: This report is submitted pursuant to the 3M Letter of Intent (LOI) dated March 13, 2003 and the PFOA Users LOI dated March 14, 2003 . The report is the fourth submission under the LOIs of the results of groundwater and wastewater monitoring at the 3M manufacturing sites at Cottage Grove, MN and Decatur, AL. Perfluorooctanoic acid (PFOA) was previously produced at these sites. This submittal also includes previously provided surface water results for the Tennessee River in the vicinity of the 3M Decatur facility and analytical results for sediments, fish and clams for the same locations that have been finalized within the last year . As noted in the 3M LOI and in the 3M submission pursuant to this LOI, monitoring of wastewater treatment plant effluent and groundwater for the presence of PFOA has been underway at the Decatur and Cottage Grove sites for a number of years. This monitoring was initiated as a result of 3M voluntary commitments and/or plans established through permits with local regulators . Under the 3M LOI, 3M agreed to continue this monitoring in order to assess the trends that are likely to occur as a result of the 3M production phase-out of PFOA, completed at the end of 2002 and the discontinuation of the use of PFOA at the Dyneon fluoropolymer manufacturing facility. Because the Dyneon and former 3M manufacturing operations are located at the same site, it was determined that monitoring would be conducted and reported jointly by 3M and Dyneon. The description of the monitoring program under the LOIs can be found in our May 7, 2003 letter to Ward Penberthy of EPA, and in our first Submission of Monitoring Data dated August 1, 2003 . These two documents have been entered into the AR-226 Docket and the PFOA Electronic Docket 2003 - 0012 . Please refer to those two Dockets for background information and a detailed description of the test methodology, sampling plans and proposed test schedule for wastewater and groundwater monitoring at the Cottage Grove and Decatur sites. CONTAIN NO CC3I ~Z q 8~? 7L p. 2 Page 2 of 11 Document Control Office (DCO) Office of Pollution Prevention and Toxics (OPPT) U.S . Environmental Protection Agency COTTAGE GROVE, MN SITE MONITORING DATA Monitoring Results Groundwater Monitoring As explained in the previous submittals, 3M selected five groundwater sampling locations for semi-annual PFOA monitoring . The five monitoring points were chosen as representative of the following site conditions. (Please consult the site map attached to the report dated August 1, 2004) : Monitoring Point MW-7 MW-4 PZ-14 MW-101 Water supply distribution system Site Condition Upgradient of site industrial activities Central to site industrial activities Western/downgradient of site industrial activities Eastern/downgradient of site industrial activities Site-wide ground water from the production wells Since submittal of the last annual LOI report, PFOA data from the five monitoring points listed above was obtained for sampling events conducted on March 12-16, 2005, November 9, 2005 and June 29, 2006 . The results of these monitoring events and previous sampling events for these points are presented in the attached Table 1 . Sampling of the water supply distribution system was substituted for sampling of the individual high-capacity pumping wells because the water that supplies this system is a composite of water drawn from these wells and therefore is representative of groundwater throughout the developed portion of the site . It should be noted that a granular activated carbon (GAC) treatment system was installed at this sample location in late 2004. The results for samples collected on March 12 and June 22, 2005 represent post-treatment water. As expected, PFOA was not detected in these samples at a limit of quantitation of 0.025 ug/L . For subsequent sampling events, pre-treatment water was also collected in order to continue the trend analysis in the water supply distribution system. Results for the November 2005 and June 2006 events represent water collected prior to GAC treatment. Effluent Monitoriniz The site has a multi-phased wastewater treatment plant that is used to treat all process wastewaters generated at Cottage Grove. Two of the systems treat inorganic wastewaters and the third is an organic, biological treatment system. At this time, all of the process effluent wastewater is treated with activated carbon . All of the treated process wastewaters from these operations are combined at a single discharge point and then are further combined with noncontact cooling and storm water before being discharged to the Mississippi River. p. 3 Page 3 of 11 Document Control Office (DCO) Office of Pollution Prevention and Toxics (OPPT) U.S . Environmental Protection Agency Since January 2001, the 3M Cottage Grove plant has conducted PFOA analysis of its effluent . (It should be noted that previous reports incorrectly listed this initial sampling time period as January 2000 .) Sampling has been performed monthly beginning in January 2003 in accordance with the requirements of 3M's NPDES permit. This information is reported to the Minnesota Pollution Control Agency in the monthly Discharge Monitoring Reports (DMR). Effluent wastewater samples are collected at the plant outfall to the Mississippi River. This is the common discharge point for all of the plant's process wastewaters . All samples are collected as 24-hour composites and duplicate analysis is conducted for each sample. The monitoring results of the Cottage Grove process wastewater effluent discharged under Minnesota NPDES Permit No. MN000149, Outfall SD 001 are shown in the attached Table 2. The data includes results of all monitoring events in 2006 (for which final analytical data is available) and from previous years. As shown in Table 2, PFOA levels have clearly dropped since submittal of the last LOI annual report . As mentioned above and in previous meetings and reports, 3M has installed an activated carbon treatment system to remove certain constituents from the wastewater treatment plant effluent. This system has been optimized and is in full operation. While the system was installed for reasons unrelated to PFOA, this technology has been shown to be effective in removing this substance as well . DECATUR, AL SITE MONITORING DATA Monitoring Results Groundwater Monitoriny, As stated in the previous submissions, 3M selected the following wells for groundwater sampling and PFOA analysis going forward (see site map attached to the August 1, 2004 report) : Monitoring Location Site Condition Wells 226R & L Wells 220R and L Well 320L Located east of inactive landfill and south of wastewater treatment - monitors background conditions in residuum and shallow limestone groundwater Located northeast of inactive landfill - monitors predominant flow path of plume in residuum and shallow limestone zones Located north of inactive landfill - monitors secondary flow path of plume p. 4 Page 4 of 11 Document Control Office (DCO) Office of Pollution Prevention and Toxics (OPPT) U.S . Environmental Protection Agency Wells 327R Located in the former incinerator area - monitors residuum groundwater near source area Wells 310R & 317L Located in the Chemical Plant - monitors dominant groundwater flow pathways in the Chemical Plant Groundwater samples from the eight monitoring points were collected in November 2005 and June 2006 . The PFOA results are presented in the attached Table 3 . As indicated by the data presented in Table 3, there is a wide range of PFOA levels measured in the groundwater beneath the site . Effluent Monitoring 3M's Decatur, Alabama manufacturing facilities obtain process water from the City of Decatur Utilities and directly from the Tennessee River. In addition, many of the manufacturing operations utilize non-contact cooling water, which is obtained from the Tennessee River. All process wastewaters from the 3M and Dyneon manufacturing operations are treated in the site's wastewater treatment facility . The system contains both physical-chemical and biological treatment. Process wastewaters are mixed with non-contact cooling water prior to discharge to the Tennessee River. The discharge is permitted under Alabama NPDES Permit No . AL0000205 . The process wastewater discharge and combined process wastewater/non-contact cooling water is designated as Outfal1001A and 001, respectively. As explained in our May 7, 2003 letter, wastewater sampling at the Decatur site for PFOA analysis is being conducted on a quarterly basis. Samples are collected at Outfall 001, which consists of treated process wastewater and non-contact cooling water. The outfall discharges to Baker's Creek, which in turn empties into the Tennessee River. All samples are collected as 24hour composites and duplicated analysis is conducted for each sample. The specific sampling and analytical protocols were described in 3M's May 7, 2003 letter to EPA. The PFOA monitoring results for the Decatur wastewater effluent discharged under Alabama NPDES Permit No. AL000205, Outfall 001 are shown in the attached Table 4. The data summary includes the historical data and the results from 2003 - 2006 monitoring events . As indicated by these data, there has been some variation in the levels of PFOA in the discharge to the Tennessee River. Effluent concentrations have shown a significant decrease since 2002 when PFOA production and use was phased out. Surface Water Sampling Surface water sampling in the Tennessee River/Bakers Creek was performed at a total of 8 locations, including the 3 LOI locations sampled in 2002 . The LOI surface water samples were co-located with sediment sample locations and fish and clam sampling locations. p. 5 Page 5 of 11 Document Control Office (DCO) Office of Pollution Prevention and Toxics (OPPT) U.S . Environmental Protection Agency The three LOI surface water sampling locations were located upstream of the facility at river mile 307 .5 (LOC-3), across the river from the facility at river mile 301 (LOC-2), and downstream of the facility at the mouth of Fox Creek (river mile approximately 296; LOC-1) . Additional information on the sampling rationale, procedures, and locations is contained in the Phase 2 Work Plan for Sampling Environmental Media (WESTON, 2004). Analytical data from the 2002 and 2004 sampling periods are shown in the attached Table 5 . Sediment and Fish Sampling Analyses of sediment, fish whole body, fish filet and whole body clam tissue samples for PFOA concentrations were finalized last year by the Exygen laboratory. Results of these analyses were provided in the July 25 - October 25, 2005 Phase 2 PFOA Quarterly Progress Report and are summarized in this submittal in the attached Table 6. In summary, this letter reports results of wastewater, groundwater, surface water, sediment, fish and clam monitoring at the Decatur site and wastewater and groundwater sampling at the Cottage Grove site . This submittal fulfills the continuing commitments of 3M and Dyneon under the March 13, 2003 3M LOI and the March 14, 2003 APFO Users LOI. If there are any questions, please contact the writer at the address provided below. Sincerely, Michael A. Sa,Xtoro Director, Environmental, Health, Safety and Regulatory Affairs 3M - Bldg . 236-1B-10 St. Paul, MN 55144 651733-6374 (phone) 651733-1958 (fax) E-mail: masantoro(a)mmm.com cc: Mary Dominiak -Room 4410 Attachments p. 6 Page 6 of 11 Document Control Office (DCO) Office of Pollution Prevention and Toxics (OPPT) U.S . Environmental Protection Agency Sample Location MW - 7 MW-101 Water Supply Distribution System PZ-14 MW-4 Table 1 . 3M Cottage Grove Groundwater Monitoring Results Date Sampled 07/11/01 09/07/01 10131/01 11112/01 12/03/02 06105/03 09/30/03 05/19/04 09129/04 03116105 O6/22/05 11/09/05 06/29/06 PFOA (ppb) NA NA NA NA NA 0.309 0.329 0.367 0.36 0.237 0.235 0.238 0.213 PFOA Lab Re plicate b NA NA NA NA NA 0.307 0.334 NA NA 0.294 0.225 0.196 0.189 PFOA Field Du Ilcate b PFOA Avg (ppb) NA NA NA NA NA NA NA NA NA 0 .326 NA 0 .314 0 .327 0 .366 0 .328 0.3665 0 .37 0 .314 0.37 0 .282 0 .267 0 .242 0 .25T- '0.228 0 .237 0.213 07/11101 NA NA NA NA 09/07/01 NA NA NA NA 10/31101 NA NA NA NA 11/12/Ot NA NA NA NA 12/03102 170 180 172 174 06105/03 135 149 125 136 09/30103 158 155 154 156 05/19/04 236 NA 230 233 09/29/04 163 NA 165 164 03112/05 157 147 145 150 06122/05 125 129 183 146 11/09/05 120 120 121 120 06/29/O6 127 124 126 126 07/11/01 1 .23 1 .14 NA 1 .18 09/07/01 NA NA NA NA 10/31/01 40 .6 38 .5 41 .1 40 .1 11/12/01 11 .4 10 .8 17.1 13 .1 12/03/02 NA NA NA NA O6/05/03 28 28 .1 27.7 27 .9 09130/03 5.17 5 .35 8 .77 6.43 05/19/04 23 .6 NA 23.3 - 23 .4 09/29/04 12 .9 NA 15.8 14 .4 03/12/05 ND ND ND ND 06/22/05 ND ND ND ND 11/09/05 10 .5 8 .34 10.5 9.78 06/29/06 9.72 9 .66 9 .27 9.55 07/11/01 NA NA NA NA 09/07/01 6.40 6 .77 6 .06 6.41 10/31/01 5.89 4 .96 5 .25 5.37 11/12/01 4.66 4 .63 4 .60 4.63 12/03/02 NA NA NA NA 06/05/03 4.80 4 .67 4 .96 4.81 09/30/03 4.10 3 .98 4 .09 4.06 05/19/04 4.68 NA 4 .83 4.76 09/29/04 4.40 NA 4 .40 4.40 03/15/05 2.71 2 .02 2 .40 2.38 06/22/05 1 .60 1 .73 1 .78 1 .70 11/09/05 1 .67 0 .96 1 .69 1 .44 O6/29/06 1 .42 1 .40 1 .37 1 .40 07/11/01 NA NA NA NA 09/07/01 NA NA NA NA 10/31/01 5.67 5 .93 7 .39 6.33 11/12/01 5.30 5 .11 5 .45 5.29 12/03/02 NA NA NA NA 06/05/03 10.2 10.2 10.1 10 .2 09/30/03 8.74 9 .10 9 .12 8.99 05/19/04 17.0 NA 16 .4 16 .7 09/29/04 12.2 NA 13 .3 12 .8 03/16/05 10.7 9 .47 9 .31 9.83 06/22/05 _ 10.4 9 .56 9 .65 9.87 11/09/05 12.3 8 .90 NR 10 .6 06129/O6 6 .82 6 .81 6 .89 6.84 Table Notes: ppb: parts per billion (ug/L) NA : data not available for sampling period ND : not detected at or aboae 0 .025 ug/L NR : not reportable due to quality control issues p. 7 Page 7 of 11 Document Control Office (DCO) Office of Pollution Prevention and Toxics (OPPT) U.S . Environmental Protection Agency Sample Location SD 001 Table 2. 3M Cottage Grove Effluent Monitoring Results Date Sampled Jan-Mar 2001 Sep-Oct 2001 PFOA (ppb) PFOA Field Du plicate b Axerage of 8 data points Axerage of 3 data points 12/12/02 01/15/03 02/12/03 03/12/03 04/23/03 05/15/03 06/11/03 07/16/03 08/07/03 09/10/03 10/08/03 11/05/03 12/10/03 01/14/04 02/04/04 03/03/04 04/07/04 05/05/04 06/02/04 07/14/04 08/04/04 09/01/04 10/13/04 11/11/04 12/01/04 01/12/05 02/03/05 03/10/05 04/07/05 05/05/05 06/09/05 07/06/05 08/18/05 09/15/05 10/06/05 11/02/05 12/07/05 01/04/06 02/01/06 03/01/06 04/05/06 05/03/06 06/08/06 07/05/06 08/02/06 80 .1 80 .0 74 .3 112 95 .0 18 .9 77 .4 79 .7 53 .3 73 .9 60 .1 64 .7 2003 Average 1 .60 127 73 .3 8.90 36 .8 2.50 81 .1 3.00 8.00 1 .00 32 .8 28 .3 2004 Average 19 .2 22 .2 262 26 .1 4.30 41 .9 46 .7 32 .0 1 .20 1 .90 66 .6 0.90 2005 Average 0.83 1 .96 0.94 4.20 0.33 0.26 0.34 0.50 2006 Average (YTD) 77 .9 78 .8 74 .7 109 101 16 .4 79 .7 85 .2 55 .5 102 67 .8 66 .5 1 .74 102 75 .9 9.50 34 .3 2.50 73 .4 2.70 7.90 1 .00 32 .5 29 .0 20 .0 23 .8 264 24 .7 4.30 48 .0 42 .4 28 .4 1 .20 1 .90 52 .5 0.90 0.94 2.10 0.96 4.40 0.34 0.25 0.34 0.48 Table Notes: ppb: parts per billion (ug/L) PFOA Avg (ppb) 1991 216 180 79 .0 79 .4 74 .5 110.5 98 .0 17 .7 78.6 82 .5 54.4 88.0 64.0 65.6 74.4 1 .67 114.5 74.6 9.20 35.6 2.50 77.3 2.90 8.00 1 .00 32 .7 28.7 32.4 19.6 23.0 263 25.4 4.30 45.0 44 .6 30 .2 1 .20 1 .90 59.6 0.90 43.2 0.88 2 .03 0.95 4.30 0.33 0.26 0.34 0.49 1 .20 p. 8 Page 8 of 11 Document Control Office (DCO) Office of Pollution Prevention and Toxics (OPPT) U.S . Environmental Protection Agency Sample Location 220L Table 3 . 3M Decatur Groundwater Monitoring Results Date Sampled 07/16/03 12/xx/03 06/xx/04 12/16/04 06/xx/05 11/xx/O5 O6/xx/O6 PFOA (ppb) 89.2 135 110 139 51 .2 69.7 90.1 PFOA Lab Re plicate b 88.8 131 NA NA 55.3 65.8 89.0 PFOA Field Duplicate b 90 .2 142 121 129 52 .3 67 .3 122 07/16/03 68.2 12/xx/03 102 06/xx104 92.3 220R 12116104 68.5 06/xx105 40.6 111xx/05 51 .8 O6/xx/06 64 .4 68.6 89.0 NA NA 44.1 50 .2 67 .8 65 .8 106 97 .9 65 .3 42 .0 47 .7 61 .2 07/16103 NQ ND ND 121xx103 ND ND ND O6lxxl04 ND NA ND 226L 17116/04 ND NA ND 061xx105 ND ND ND 11/xx/05 ND ND ND 06/xx106 ND ND ND 07/16103 10.6 12/xx103 11 .7 O6/xx/04 9 .54 226R 12/16/04 9 .84 O6/xx/05 4 .94 11/xx105 9 .20 061xx/06 7 .57 11 .0 10.6 NA NA 5 .08 9 .05 7 .63 10 .6 13 .2 9 .85 11 .2 7 .92 8 .39 8 .51 310R 03128/01 07/16103 12/xx/03 061xx/04 12J16/04 06/xx/05 111xx/05 061xx/06 1060 1570 2010 1580 1870 1640 1440 1460 1110 1560 2140 NA NA 1430 1280 1740 1190 1590 2670 1940 1830 1260 1280 1270 317L 07116/03 12/xx/03 O6/xx/04 12116/04 06/xx105 11/xx/05 06/xx/O6 0 .940 0 .521 0 .776 0 .860 0 .410 0 .383 0 .514 0 .950 0 .490 NA NA 0 .763 0 .384 0 .369 0 .990 0 .785 0 .792 0 .874 0 .545 0 .387 0 .433 320L 07/16103 12/xx/03 06/xx/04 12/16/04 06/xx/05 11/xx/O5 O6/xx/O6 ND NQ 0 .483 0 .0764 0 .134 ND 0 .0406 ND NQ NA NA 0 .158 ND 0.0397 NQ NQ 0 .506 0.0802 0 .167 ND 0.0539 327R 07/16/03 12/xx/03 06/xx/04 12116/04 O6/xx/05 11/xx/05 ~ 06/xx/06 2280 2600 1780 1910 1360 NA 1850 NA 1080 1030 1260 1090 907 T 968 2280 1910 1370 1750 803 1150 791 Table Notes: ppb: parts per billion (ug/L) NA : data not a%eilable for sampling period ND: not detected at or abo%e 0 .025 ug/L NQ : not quantifiable PFOA Avg (ppb) 89 .4 136 116 134 52 .9 67 .6 100 67 .5 99 .0 95 .1 66 .9 42 .2 49 .9 64 .5 ND ND ND ND ND ND ND 10 .7 11 .8 9 .70 10 .5 5 .98 8 .88 7 .90 1120 1573 2273 1760 1850 1443 1333 1490 0.960 0.599 0.784 0.867 0.573 0.385 0.439 ND NQ 0 .495 0 .0783 0 .153 ND 0 .0447 2386 1867 1365 1800 971 1167 889 p. 9 Page 9 of 11 Document Control Office (DCO) Office of Pollution Prevention and Toxics (OPPT) U.S . Environmental Protection Agency Sample Location Outfall 001 Table 4. 3M Decatur Effluent Monitoring Results Date Sampled 1998 1999 2000 2001 01 /xx/03 05/28/03 07/21/03 11/03/03 01/27104 06/16/04 12/20/04 02/15/05 05/24/05 08/23/05 12/13/05 02/14/06 ~ 06/27/06 PFOA (ppb) PFOA Field Duplicate (ppb) NA NA NA NA NA NA NA NA NA NA 89 .0 87.5 10 .1 NA 27 .1 NA 412 NA 2.5 NA 21 .5 21 .8 12 .3 12 .0 8 .36 8 .77 8.08 8.14 3 .58 3 .70 2.12 -~ 2.12 2.52 2.49 Table Notes: ppb: parts per billion (ug/L) NA : data not available for sampling period PFOA Av g (ppb) 602 766 1028 310 58 88 .3 NA NA NA NA 21 .7 12 .2 8 .56 8.11 3 .64 2.12 2.50 Sample Location LOC-3, Ri\oer Mile 307.5 LOC-2, Ri\,er Mile 301 LOC-1, Rieer Mile 296 Table 5. 3M Decatur - Surface Water 8 Sediment Monitoring Results Date Sampled Media 2002 12/01/04 Surface water Surface water Sediment, Loc 1 Sediment, Loc 2 Sediment, Loc 3 PFOA (ppb) ND ND ND ND PFOA Lab PFOA Field Replicate (ppb) Duplicate (ppb) ND ND ND NC ND NC ND NC 2002 Surface water Surface water ND ND ND Sediment, Loc 1 ND ND NC 12/01/04 Sediment, Loc 2 ND ND NC Sediment, Loc 3 1 .11 ND NC 2002 Surface water Surface water 0.18 0 .19 0.20 Sediment, Loc 1 NQ NQ NC 12/01/04 Sediment, Loc 2 1 .54 0 .935 NC I Sediment, Loc 3 ~ 1 .93 1 .80 NC Table Notes: ppb : parts per billion (ug/L for water, ng/g (wet wgt) for sediment) NC: not collected ND: not detected at or aboee 0 .025 ug/L for water, 0.2 ng/g for sediment NQ : not quantifiable, result is between 0 .2 and 0 .4 ng/g (wet wgt) PFOA Avg (ppb) ND ND ND ND ND ND ND ND ND <0.66 0.20 0.19 NQ 1 .24 1 .87 Page 10 of 11 Document Control Office (DCO) Office of Pollution Prevention and Toxics (OPPT) U.S . Environmental Protection Agency P. 10 Table 6 . 3M Decatur-Fish and Clams Monitoring Results Sample Location Species Sample Type Sample ID Channel Catfish LOG-3 , Rh,er Mile 307 .5 Largemouth Bass Asiatic Clam Channel Catfish LOC-2, Rh,er Mile 301 Largemouth Bass Asiatic Clam Channel Catfish LOG-1 , Rieer Mile 296 Largemouth Bass ~ Asiatic Clam Filet Whole Body Filet Whole Body Whole Body Filet Whole Body Filet Whole Body Whole Body Filet Whole Body Filet Whole Body Whole Body DL3-F01-IPF001-0-041021 DL3-F01-IPF002-0-041021 DL3-F01-IPF003-0-041021 DL3-F01-IPF004-0-041021 DL3-F01-IPF005-0-041021 DL3-F01-IPW001-0-041130 DL3-F01-IPW002-0-041130 DL3-F01-IPW003-0-041130 DL3-F01-IPW004-0-041130 DL3-F01-IPW005-0-041201 DL3-F01-MSF001-0-041105 DL3-F01-MSF002-0-041105 DL3-F01-MSF003-0-041105 DL3-F01-MSF004-0-041105 DL3-F01-MSF005-0-041105 DL3-F01-MSW001-0-041105 DL3-F01-MSW002-0-041105 DL3-F01-MSW003-0-041105 DL3-F01-MSW004-0-041105 DL3-F01-MSW005-0-041105 DL3-101-CFW001-041216 DL2-F01-IPF001-0-041021 DL2-F01-IPF002-0-041021 DL2-F01-IPF003-0-041021 DL2-F01-IPF004-0-041021 DL2-F01-IPF005-0-041021 DL2-F01-IPW001-0-041021 DL2-F01-IPW002-0-041104 DI2-F01-IPW003-0-041201 DL2-F01-IPW004-0-041215 DL2-F01-IPW005-0-041215 DL2-F01-MSF001-0-041021 DL2-F01-MSF002-0-041021 DL2-F01-MSF003-0-041021 DL2-F01-MSF004-0-041021 DL2-F01-MSF005-0-041216 DL2-FOt-MSW001-0-041021 DL2-FOt-MSW002-0-041021 DL2-F01-MSW003-0-041021 DL2-F01-MSW0040-041021 DL2-F01-MSW005-0-041021 DL2-101-CFW001-041216 DL1-F01-IPF001-0-041021 DL1-F01-IPF002-0-041104 DL1-F01-IPF003-0-041104 DLt-F01-IPF004-0-041104 DL1-F01-IPF005-0-041104 DL1-F01-IPW001-0-041104 DL1-F01-IPW002-0-041104 DL1-F01-IPW003-0-041104 DL1-F01-IPW004-0-041104 DL1-F01-IPW005-0-041215 DL1-F01-MSF001-0-041104 DL1-F01-MSF002-0-041104 DL1-F01-MSF003-0-041104 DLt-F01-MSF0040-041104 DL1-FOt-MSFOOr0-041104 DL1-F01-MSW001-0-041104 DL1-FOI-MSW002-0-041104 DL1-F01-MSW003-0-041104 DL1-F01-MSW004-0-041104 DL1-F01-MSW005-0-041104 DL1-101-CFW001-041216 Date Sampled 10/21/04 10/21/04 10/21/04 10/21/04 10/21/04 11/30/04 11/30/04 11/30/04 11/30/04 12/01/04 11/05/04 11/05/04 11/05/04 11/05/04 11/05/04 11105/04 11/05/04 11/05/04 11/05/04 11/05/04 12/16/04 10/21/04 10/21/04 10/21/04 10/21/04 10/21/04 10/21/04 11/04/04 12/01/04 12/15/04 12/15/04 10/21/04 10/21/04 10/21/04 10/21/04 12/16/04 10/21/04 10/21/04 10/21/04 10/21/04 10/21/04 12/16/04 10/21/04 11/04/04 11/04/04 11/04/04 11/04/04 11/04/04 11/04/04 11/04/04 11/04/04 12/15/04 11/04/04 11/04/04 11/04/04 11/04/04 11/04/04 11/04/04 11/04/04 11/04/04 11/04/04 11/04/04 12/16/04 Table Notes: ppb: parts per billion (ug/L) ND : not detected at or aboee 0 .2 ng/g NQ : not quantifiable, measured concentration is between 0 .2 and 0 .5 ng/g PFOA (ppb) ND 0 .588 NQ ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NQ ND ND ND ND ND ND ND ND ND ND ND ND ND ND NQ ND ND ND ND ND 0.508 ND NQ ND ND ND NQ 0 .764 NQ NQ NQ ND ND ND ND ND ND ND NQ NQ NQ NQ PFOA Lab Re plicate b) ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NQ ND ND ND ND ND ND ND ND ND ND ND ND ND ND NQ ND ND ND ND ND NQ ND NQ ND ND ND NQ 0 .784 NQ NQ NQ ND ND ND ND ND ND ND NQ NQ NQ 0 .508