ARCHIVED REPORTS_MONITORING WELL INSTALLATION REPORT 2010

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Table 6: Historic Concentrations in Wells E-2 and M-813 Monitoring Well Installation Report Former Nestle USA, Inc. Facility Ripon, CA 95366 USEPA Method 8010,8021,8260 or 524 in micrograms per liter(ppb) Current Well Name/ Sampling Method Average PDB Sampling Location purge/PDB) Depth (ft bgs) Frequency Sample Date TCE cis-1,2-DCE Vc Comments/Other Detected VOC's E-2 (cont.) Purge - - 01/10/2005 43 120 38 1,1-DCE: 1.4;t-1,2-DCE: 1.1; E-2- E-6 Combined Purge - - 02/09/2005 45 110 27 1,1-DCE: 1.0;t-1,2-DCE:0.9; E-2-E-6 Combined Purge - - 03/17/2005 43 88 52 1,1-DCE: 1.2;t-1,2-DCE:0.98; E-2-E-6 Combined Purge - - 04/29/2005 39 99 38 1,1-DCE: 1.2;t-1,2-DCE:0.9; E-2-E-6 Combined Purge - - 05/05/2005 21 1.4 <0.5 Purge - - 05/11/2005 33 82 41 1,1-DCE: 1.1; E-2-E-6 Combined Purge - - 06/21/2005 39 97 42 1,1-DCE: 1.1; E-2-E-6 Combined Purge - - 07/12/2005 34 94 45 1,1-DCE: 1.2; E-2-E-6 Combined Purge - - 08/10/2005 33 93 37 1,1-DCE: 1.1; E-2-E-6 Combined Purge - - 09/07/2005 30 89 35 E-2-E-6 Combined Purge - - 10/19/2005 31 82 33 E-2-E-6 Combined Purge - - 11/28/2005 39 85 61 1,1-DCE: 1.1;t-1,2-DCE:0.88; E-2-E-6 Combined Purge - - 12/08/2005 38 96 57 1,1-DCE: 1.3;t-1,2-DCE: 1; E-2-E-6 Combined Grab - - 02/16/2006 10 1.2 <0.5 E-2, E-6 combined treatment system influent data Grab - - 04/18/2006 9.8 0.86 <0.5 E-2, E-6 combined treatment system influent data Grab - - 07/19/2006 11 0.65 <0.5 Grab - - 10/10/2006 11 0.56 <0.5 Grab - Q 10/10/2006 11 0.64 <0.5 DUP Grab - Q 02/22/2007 12 0.84 <0.5 02/22/2007 12 0.77 <0.5 DUP Grab - Q 04/25/2007 9.8 0.7 <0.5 Grab - Q 07/03/2007 8.3 0.55 <0.5 Grab - Q 11/13/2007 7.6 <0.5 <0.5 Grab - Q 02/05/2008 8.1 0.97 <0.5 Grab - Q 04/22/2008 6 0.74 <0.5 Grab - Q 07/22/2008 5.3 0.58 <0.5 Grab Q 11/06/2008 7.4 0.81 <0.5 Page 3 of 5