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• Tie, Second 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) ( (pgfL) I (pWL) (pg/L) ( I-) (p (p A-) (pg/-) (pg/L) (pgtL) (mglL) (feet) (feet) MW-1 06/03/05 30 <0 50 1 1 097 65 84 14 <0 50 <0 50 <0 50 44 2257 000 942 3199 MWAA 06/03/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <50 <0 50 <0 50 <0 50 68 2290 000 919 3209 MW-2 06/03/05 <0 50 <0 50 <0 50 15 <50 240 36 <0 50 <0 50 <0 50 167 2185 000 935 31201 MW-3 06/03/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 39 2245 000 942 3187 MW-4 06/03/05 — -- -- -- -- -- -- -- -- — -- 2305 000 968 3273 MW-4A 06/03/05 -- — — — — — — — — — — 2304 000 944 32481 MW-5 06/03/05 <0 50 <0 50 <0 50 <0 50 <50 150 150 <0 50 073 <0 50 02 2265 000 923 3188 r MW-5A 06/03/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 170 2245 000 903 3148 MW-6 06/03/05 <0 50 <0 50 <0 50 <0 50 <50 17 <5 0 <0 50 <0 50 <0 50 05 2428 000 937 33 65 MW-7 1 06/03/05 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 30 2332 0 00 9 i3 3245 Explanation TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert-amyl-methyl ether pg/L=micrograms per later MtSE=Methyl-tert-butyl ether DTW=Depth to water mg/L=milligrams per liter TBA=Tert butanol SPT=Separate-phase hydrocarbon thickness —=Not sampled/not measured DIPE=Dusopropyl ether WTE=Water table elevation ELBE=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 MWA is sampled semi-annually 1 7-ElevenV 11 Store1140631Tables119976 Current Groundwater As Page 1 of t