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First Quarter 2006 Groundwater Monitoring and Analytical Data 7-Eleven Store#19976 1399 North Main Street Manteca CA I Well IDI Ethyl- Dissolved Elevation Date Benzene Toluene Benzene Xylene TPHg MtBE TBA DIPE ETBE TAME Dotes Oxygen DTW SPT WTE (TOC) 0911. (PgIL) (WI} (WW {ug►L} (PWL) iPgn-} (Lmn-I (OWL) ( (feet) (feat} (feet) MW-701/18/06 079 <0 50 071 057 <50 56 78 <0 50 <0 50 <0 50 04 1862 000 1337 3199 MW-1A01/18/06 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 19 1882 000 1327 32 09 MW-2 01/18/06 <0 50 <0 50 <0 50 <0 50 <50 25 <5 0 <0 50 <0 50 <0 50 208 1786 000 1334 31201 MW-3 01/18/06 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 54 1852 000 1335 3187 MW-4 01/18/06 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 42 1934 000 1339 3273 MW-4A 01/18/06 <0 50 <0 50 <0 50 068 <50 <0 50 <5 0 <0 50 <0 50 <0 50 23 1913 000 1335 32481 MW-5 01/18/06 <0 50 <0 50 <0 50 <0 50 <50 39 62 <0 50 066 <0 50 06 1858 000 1330 3188 MW-5A 01/18/06 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 19 1811 000 1337 3148 MW-6 01/18/06 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 24 2035 000 1330 3365 MW-7 01/18/06 <0 50 <0 50 <0 50 <0 50 <50 60 1 <5 0 <0 50 <0 50 <0 50 15 1921 000 1324 3245 Explanation TPHg=Total petroleum hydrocarbons as-gasolene TAME=Tert-amyl-methyl ether pg1L=micrograms per liter MtBE=Methyl-terl butyl ether DTW=Depth to water mg1L=milligrams per liter TSA=Tert-butanol SPT=Separate phase hydrocarbon thickness —=Not sampled/riot measured DIPE=Diisopropyl ether WTE=Water table elevation EtBE=Ethyl tert butyl ether TOG=Top of casing elevation in feet above mean sea level Notes Samples analyzed by EPA Method 82608 Per SJCEHD letter dated May 3 2005 well MW-4 is sampled semi-annually(in first and third quarters) 7 Elevenl7 11 Store1140631Tables119976 Current Groundwater As Page t of 1