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i TO First Quarter 2005 Groundwater Monitoring and Analytical Data 7-Eleven Store#19976 1399 North Main Street Manteca CA Well IDI Ethyl- Dissolved Elevation Date BenzeneLToluene Benzene Xylene TPHg MtBE TBA DIPE ETBE TAME Notes Oxygen DTW SPT WTE (TOC) (pg/L) lL) (N9rL) (pq/L) (P9,L) (pWL) (pgrL) (pg L) (pg/L) (pgtL) OWL) (feet) (feetl (feet) MW-1 02/10/05 <0 50 <0 50 <0 50 <0 50 <50 25 56 <0 50 <0 50 <0 50 44 11 2234 000 965 3199 MW-1A 02/10/05 <0 50 067 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 29 2258 000 951 3209 MW-2 02/10/05 18 <5 0 <5 0 130 4,000 3,200 4,100 <5 0 <5 0 64 17 2156 000 964 31 20 MW-3 02/10/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 1 0 2221 000 966 31 87 - MW-4 02/10/05 — -- -- — — — -- - -- - — 2293 000 980 3273 MW-4A 02/10/05 -- — — — — -- — _ _ _ — 2283 000 965 3248 MW-5 02/10/05 <0 50 <0 50 <0 50 <0 50 <50 53 70 <0 50 054 <0 50 05 2232 000 956 3188 MW-5A 02/10/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 04 2197 000 951 3148 MW-6 02/10/05 <0 50 <0 50 <0 50 <0 50 <50 13 <5 0 <0 50 <0 50 <0 50 06 2403 000 962 3365 MW-7 02/10/05 <0 50 <0 50 <0 50 <0 50 <50 14 <5 0 <0 50 <0 50 <0 50 32 2294 000 951 32451 Explanation TPHg=Total petroleum hydrocarbons-as gasoline TAME=Tert-amyl methyl ether pg1L=micrograms per liter MTBE=Methyl-tert butyl ether 1 2-DCA=1 2 Dichloroethane mg/L=milligrams per liter TBA=Tert butanol EDB=1 2-Dibromoethane —=Not sampledinot measured DIP =Dusopropyl ether DTW=Depth to water ELBE=Ethyl-tert butyl ether SPT=Separate-phase hydrocarbon thickness WTE=Water table elevation Notes TOC=Top of casing elevation in feet above mean sea level Samples analyzed by EPA Method 82606 Per SJCEHD letter dated July 28 2004 wells MW-4 and MW-4A are sampled annually 7 Elevenl7 11 Store1140631Tables119976 Current Groundwater As Page 1 of 1 I