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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 /> M-8B cont. Purge - - 04/12/2001 85 <2.0 <2.0 <br /> Purge - - 05/09/2002 110 5.6 <0.5 <br /> Purge - - 05/02/2003 89 4 <0.5 <br /> Purge - - 04/22/2004 100 2.9 <0.5 <br /> Purge - - 04/22/2004 110 2.7 <0.5 DUP <br /> PDB 28.5 - 04/19/2005 15 <0.5 <0.5 <br /> PDB 33.5 - 04/19/2005 30 <0.5 <0.5 <br /> PDB 38.5 - 04/19/2005 58 0.73 <0.5 <br /> Purqe - - 05/10/2005 74 1 <0.5 <br /> PDB 38.5 A 04/18/2006 35 <0.5 <0.5 <br /> PDB 38.5 A 04/25/2007 14 <0.5 <0.5 <br /> PDB 38.5 A 04/28/2008 6.9 <0.5 <0.5 <br /> PDB 38.5 A 04/10/2009 17 <0.5 <0.5 <br /> NnTF.q. <br /> Sampling frequency symbols defined as: A: Annual sampling <br /> M: Monthly sampling SA: Semi-annual sampling <br /> Q: Quarterly sampling B: Biennial sampling (odd-numbered years). <br /> DEFINITICNIS ANIS ANAI YTF I IST <br /> NA Data Not available or Unknown bgs below ground surface <br /> Not Available/Not Applicable msl above mean sea level <br /> NS Not Sampled ppb parts per billion <br /> NR Sampling Not Required PDB Passive Diffusion Bag <br /> 1,1-DCA 1,1-Dichloroethane TCMA Trichlorofluoromethane <br /> 1,1-DCE 1,1-Dichloroethene VC Vinyl Chloride <br /> CF Chloroform Tol toluene <br /> cis-1,2-DCE cis1,2-Dichloroethene CCL4 Carbon Tetrachloride <br /> t-1,2-DCE trans-l,2-Dichloroethene <br /> DUP Duplicate <br /> Page 5 of 5 <br />