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i Tot • Third Quarter 2005 Groundwater Monitoring and Analytical Data 7-Eleven Store#19976 1399 North Main Street Manteca CA Weil ID! Ethyl- Dissolved Elevation Date Benzene Toluene Benzene XyleneLTPHg MtBE TBA DIPE ETBE TAME Notes Oxygen DTW SPT WTE {TpC) [NgfL (p ) { ) { ) (OWL) ( ) WIL) (p !L) m L feet) (feet) (feet) MW-1 08/15/05 <0 50 <0 50 <0 50 <0 50 <50 72 <5 0 <0 50 <0 50 <0 50 69 2174 000 1025 3199 MW-1A 08/15/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 55 2199 000 1010 3209 MW-2 08/15/05 53 45 072 110 3,000 940 350 <0 50 <0 50 37 1 9 2102 000 1018 31201 y MW-3 08/15/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 39 2168 000 1019 3187 MW-4 08/15/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 84 2232 000 1041 3273 MW-4A 08/15105 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 25 2207 000 1041 32481 MW-5 08/15/05 <0 50 <0 50 <0 50 <0 50 <50 43 44 <0 50 <0 50 <0 50 12 2179 000 1009 3188 MW-5A 08/15/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 208 2135 000 1013 3148 MW-6 08115/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 16 2347 000 1018 3365 MW-7 08/15/05 <0 50 <0 50 <0 50 <0 50 <50 069 <5 0 <0 50 <0 50 <0 50 36 2246 000 999 32451 Explanation TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert amyl-methyl ether Ug/L=micrograms per liter MTBE=Methyl tert butyl ether DTW=Depth to water mglL=milligrams per liter TBA=Tert butanol SPT=Separate-phase hydrocarbon thickness —=Not sampled/not measured DIPE=Dusopropyl ether WTE=Water table elevation EtBE=Ethyl-tert-butyl ether TOC=Top of casing elevation in feet above mean sea level Notes Samples analyzed by EPA Method 8260B Per SJCEHD letter dated May 3 2005 well MW-4 is sampled semi-annually(in first and third quarters) 7-Elevenl7-11 Store1140631Tables419976 Current Groundwater As Page 1 of 1