SITE INFORMATION AND CORRESPONDENCE_2001-CURRENT

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Chevron 2 - • 1 March 2007 Stone Brothers Management Okpany 5400 and 5606 Pacific Ave, Stockton The following table lists all analytes, the wells where detected, the historic and most recent maximum analyte detections, dates detected, and applicable WQGs, taken from "A Compilation of Water Quality Goals"which may be found at http://www.waterboards.ca.gov/cent alvalle /available documents/index.html#WaterQualit Goals ANALYTE WELL WELL WQGs HIGHEST DETECTION LAST MAXIMUM DETECTION DATE DATE TPHg MW-3 MW-2 5 ug/L 130,000 ug/L 16,000 ug/L 6/21/1995 10/11/2006 Benzene MW-11 MW-11 0.15 ug/L 20,000 ug/L 2,800 ug/L 12/30/1992 10/11/2006 Toluene MW-11 MW-3 42 ug/L 2 7,000 ug/L 280 ug/L 9/30/1992 10/12/2006 Ethylbenzene MW-4 MW-3 29 ug/L 3,290 ug/L 260 ug/L 3/27/2001 10/12/2006 Xylenes MW-3 MW-3 17 ug/L 12,420 ug/L 979 ug/L 9/16/1999 10/12/2006 Methyl tert-Butyl Ether' MW-11 MW-7 5 ug/L (MtBE) 2,400 ug/L 0.6 ug//L (J) 9/16/1997 10/12/2006 Tertiary Butyl Alcohol Did not analyze prior to MW-3 12 ug/L (TBA) 10/12/2006 13 ug/L (J) Not reported in Tables 10/1212006 Di-isopropyl ether(DIPE) Did not analyze prior to All wells 0.8 ug/ 10/12/2006 <0.5 ug/L Not reported in Tables 10/12/2006 Ethyl Tertiary Butyl Ether Did not analyze prior to All wells NA (ETBE) 10/12/2006 <0.5 ug/L Not reported in Tables 10/12/2006 Tertiary Amyl Methyl Did not analyze prior to All wells NA Ether(TAME) 10/12/2006 <0.5 ug/L Not reported in Tables 10/12/2006 1,2-DCA MW-1 i :.MW-28 0.4 ug/L 680 ug/L 4.1 ug/L 6/3/1992_ 7/13/2006 Ethylene Dibromide All wells All wells 0.0097 ug/L EDB <0.5 u /L _ <0.5 u /L Ethanol All wells All wells 760,000 ug/L <250 u /L <250 u /L Methanol All wells All wells 3,500 ug/L <100 u /L <100 u /L 1,3,5-Trimethylbenzene MW-25D MW-2 15 ug/L 766 ug/L 75 ug/L 3/27/2001 10/12/2006 1,2,4-Trimethylbenzene MW-2 MW-2 330 ug/L 2,900 ug/L 1,200 ug/L 7/14/2006 _ 10/12/2006 Isopropyl benzene MW-4 MW-2 0.8 ug/L 174 UG/I 47 ug/L 3/27/2001 10/12/2006