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. Grab - Q 02/09/2009 6.8 1.5 <0.5 Grab - Q 04/24/2009 5.4 1.1 <0.5 Grab - Q 07/29/2009 5.6 1 <0.5 Grab Q 10/06/2009 6.3 1 <0.5 M-813 Purge - - 10/01/1987 360 <5 <5 Purge - - 06/01/1988 300 NA <0.5 Purge - - 03/01/1989 900 <50 <50 Purge - - 11/01/1989 1300 <50 <50 Purge - - 03/01/1990 1300 <50 <50 Purge - - 07/01/1990 790 <0.5 <0.5 Purge - - 07/01/1990 900 <0.5 <0.5 DUP Purge - - 09/01/1990 1365 10.2 <0.5 Purge - - 09/01/1990 1293 9.1 <0.5 DUP Purge - - 12/01/1990 748 2 <0.5 Purge - - 04/01/1991 1400 19 <0.5 Purge - - 07/01/1991 83 19 <0.5 CF: 0.9 Purge - - 10/01/1991 1060 36 <0.5 Tol:4.7; CF:2.7 Purge - - 03/01/1992 618 19 <0.5 CF: 0.8 Purge - - 06/01/1992 900 18 <0.5 CF: 1.3 Purge - - 10/01/1992 1000 22 <0.5 CF:2.3 Purge - - 10/01/1992 1030 22 <0.5 DUP; CF:2.8 Purge - - 01/01/1993 580 31 <0.5 CF: 1.9 Purge - - 04/01/1993 800 25 <0.5 CF:2.2 Purge - - 08/01/1993 400 8.9 <0.5 CF: 1.3 Purge - - 01/01/1994 420 9.9 <0.5 MC:0.5; CF: 1.3 Purge - - 05/01/1994 780 23 <0.5 MC:4.2; CF: 1.6 Purge - - 03/01/1995 700 37 <0.5 CF: 1.3 Purge - - 04/01/1996 82 4.1 <0.5 Purge - - 04/01/1997 750 3.2 <0.5 Purge - - 07/01/1997 160 6 <0.5 MC:0.9 Purge - - 07/01/1997 <50 4.3 <0.5 DUP Purge - - 04/29/1998 170 4 <0.5 1,1,1-TCA:0.7; 1,2-DCP: 17; CF: 0.5 Purge - - 04/29/1998 180 7.3 <0.5 DUP3; CF: 0.7 Purge - - 04/06/1999 180 5.2 <0.5 Pure 04/18/2000 1 230 1 7.4 1 <0.5 CF: 0.8 Page 4 of 5