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Table 6: <br /> Historic Concentrations in Wells E-2 and M-813 <br /> Monitoring Well Installation Report <br /> Former Nestle USA, Inc. Facility <br /> Ripon, CA 95366 <br /> USEPA Method 8010,8021,8260 or 524 in micrograms per liter(ppb) <br /> Current <br /> Well Name/ Sampling Method Average PDB Sampling <br /> Location (purge/PDB) Depth (ft bgs) Frequency Sample Date TCE cis-1,2-DCE VC Comments/Other Detected VOC's <br /> E-2 cont. Purge - - 10/07/2002 45 12 0.6 <br /> Purge - - 11/04/2002 25 2.8 <0.5 <br /> Purge - - 12/03/2002 38 11 0.5 <br /> Purge - - 02/13/2003 27 3.3 0.7 <br /> Purge - - 03/28/2003 33 9.1 0.9 <br /> Purge - - 04/07/2003 26 8.2 0.5 <br /> Purge - - 04/29/2003 36 9.5 0.8 <br /> Purge - - 05/28/2003 34 8.5 0.9 <br /> Purge - - 06/24/2003 33 8.2 0.9 <br /> Purge - - 07/21/2003 28 6.8 0.6 <br /> Purge - - 08/18/2003 37 9.4 <0.5 <br /> Purge - - 09/29/2003 37 11 0.7 <br /> Purge - - 10/09/2003 34 11 1 <br /> Purge - - 10/27/2003 33 9.3 1.5 <br /> Purge - - 10/30/2003 33 9.3 1.5 <br /> Purge - - 11/06/2003 27 8.4 0.8 <br /> Purge - - 12/10/2003 29 9.1 0.7 <br /> Purge - - 01/26/2004 30 8.9 1 <br /> Purge - - 02/09/2004 33 8.9 1.2 <br /> Purge - - 03/15/2004 31 9 1.9 <br /> Purge - - 04/26/2004 27 5.6 1.1 <br /> Purge - - 05/13/2004 30 6.9 1.5 <br /> Purge - - 07/19/2004 45 150 36 1,1-DCE: 1.8;t-1,2-DCE:0.9; E-2-E-6 <br /> Combined <br /> Purge - - 07/20/2004 45 140 39 Other VOCs: 3.0; E-2-E-6 Combined <br /> Purge - - 08/04/2004 47 160 35 Other VOCs:2.5; E-2-E-6 Combined <br /> Purge - - 08/05/2004 49 170 36 Other VOCs:2.6; E-2-E-6 Combined <br /> Purge - - 09/20/2004 38 120 27 1,1-DCE: 1.2;t-1,2-DCE:0.8; E-2-E-6 <br /> Combined <br /> Purge - - 10/19/2004 44 130 27 1,1-DCE: 1.3;t-1,2-DCE:0.9; E-2-E-6 <br /> Combined <br /> Purge - - 11/08/2004 49 140 46 1,1-DCE: 1.1;t-1,2-DCE:0.8; E-2-E-6 <br /> Combined <br /> Pure 12/08/2004 1 61 1 170 1 30 1 Other VOCs:2.1; E-2-E-6 Combined <br /> Page 2 of 5 <br />