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• Tie, • Fourth Quarter 2005 Groundwater Monitoring and Analytical Data 7-Eleven Store#19976 1399 North Main Street Manteca CA Well IDI Ethyl- Dissolved Elevation Date Benzene Toluene Benzene Xylene TPHg MtBE TBA DIPE ETBE TAME Notes Oxygen DTW SPT WTE (Toc) (pg/L ipg'L! /L ( n- fu ) Mal (feet) MW-1 10/26/05 18 <0 50 <0 50 10 <50 17 <5 0 <0 50 <0 50 <0 50 64 2001 000 1198 3199 MWAA 10/26/05 1 1 20 097 29 <50 23 <5 0 <0 50 <0 50 <0 50 49 2021 000 1188 3209 MW-2 10/26105 <0 50 066 <0 50 18 1,000 220 83 <0 50 <0 50 <0 50 150 1924 000 1196 31201 MW-3 10/26/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 45 1991 000 1196 3187 MWA 10/26/05 - - - - -- -- - - - - 73 1963 000 1310 3273 MW-4A 10/26/05 <0 50 <0 50 <0 50 070 <50 <0 50 <5 0 <0 50 <0 50 <0 50 56 2038 000 1210 32481 MW-5 10/26/05 <0 50 <0 50 <0 50 <0 50 <50 as 63 <0 50 <0 50 <0 50 23 1998 000 1190 31 88 MW-5A 10/26/05 <0 50 085 <0 50 089 <50 <0 50 <50 <0 50 <0 50 <0 50 21 1961 000 11 87 3148 MW-6 10/26/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 36 2176 000 1189 3365 MW-7 10/26/05 1 1 21 080 2 5 <50 48 <5 0 <0 50 <0 50 <0 50 24 20 59 0 00 1186 32 45 Explanation TPHg=Total petroleum hydrocarbons as-gasoline TAME=Tert amyl-methyl ether pgTL=micrograms per liter MtBE=Methyl-tert-butyl ether DTW=Depth to water mg/L=mit igrams 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 TQC=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 Store1140631Tabies119976 Current Groundwater As Page 1 of 1 I