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TABLE A4 ANALYTICAL RESULTS OF GRAB GROUND WATER SAMPLES - EPA Methods 8015M/826013 STALLWORTH AUTO SALES 602 North California Street, Stockton, California �µS�) EPA Methods 8015M/8021 EPA Method 8260B Sample Sample ID Date TPH-g TPH-d Benzene Toluene Ethyl- Xylenes DI PE ETBE MTBE TAME TBA EDB 1 ,2-DCA benzene P-521 -2 01/31 /06 <50 <50 <0 .5 < 0 .5 <0 .5 <0 .6 < 1 .0 < 1 .0 Q .0 < 1 .0 < 10 <0 .5 <0 .5 P-521 -3 01 /31 /06 <50 <50 <0 .5 < 0 .5 <0.5 <0 .6 Q .0 < 1 .0 <1 .0 <1 .0 < 10 <0 .5 <0 .5 BS -70 02/06/08 <50 <50 <0 .5 < 0 .5 <0.5 <0 .6 < 1 .0 <1 .0 < 1 .0 < 1 .0 <10 <0 .5 <0 .5 B5-130 02/05/08 <50 <50 <0 .5 < 0 .5 <0 .5 <0 .6 <1 :0 < 1 .0 <1 .0 <1 .0 < 10 <0 .5 <0 .5 B6-75 02/07/08 35300 55600 2 .7 12 42 75.9 <1 .0 < 1 .0 < 1 .0 < 1 .0 < 10 <0 .5 <0 . 5 B6- 130 02/07/08 <50 <50 <0 .5 < 0 .5 <0 .5 <0 .6 <1 .0 < 1 .0 <1 .0 < 1 .0 < 10 <0 .5 <0 .5 CPT6-75 02/06/08 <50 <50 <0 .5 < 0 .5 <0 .5 <0.6. < 1 .0 < 1 .0 <1 .0 <1 .0 <10 <0.5 <0 .5 CPT6-130 02/06/08 <50 <50 <0 .5 < 0.5 <0 .5 <0.6 <1 .0 < 1 .0 < 1 .0 CPT7-75 02/07/08 15800 45800 2.0 <0.5 1 ,5 <0.6 < 1 .0 < 1 .0 < 1 .0 CPT7-130 02/07/08 <50 <50 <0 .5 < 0.5 <0.5 <0 .6 <1 .0 <1 .0 < 1 .0 Q .0 <10 <0.5 <0.5 CPT8 -70 02/05/08 90,000 81400 3 ,300 49200 35000 13,100 < 1 .0 < 1 .0 <1 .0 290 <10 <0 .5 82 CPT8-130 02/05/08 <50 <50 <0 .5 < 0 .5 <0 .5 <0 .6 < 1 .0 Q .0 < 1 .0 < 1 .0 <10 <0 .5 <0.5 Notes: pg/l: micrograms per liter TPH-g: total petroleum hydrocarbons quantified as gasoline TAME: tertiary amyl methyl ether a. not analyzed TPH-d: total petroleum hydrocarbons quantified as diesel TBA: tertiary butanol or tertiary Butyl Alcohol unmodified or weakly modified gasoline is significant DIl'E: di-isopropyl ether EDB: ethylene dibromide dgasoline range compounds are significant ETBE: ethyl tert butyl ether 1 ,2-DCA: 1 ,2-dichloroethme MTBE: methyl tert butyl ether Advanced GeoEnvironmental, Inc.