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! i • <br /> TABLE 1 - GROUNDWATER MONITORING AND CHEMICAL ANALYTICAL DATA <br /> Tosco (76) Service Station No 11192 <br /> 1403 Country Club Boulevard <br /> Stockton, California <br /> Total Welli Depth Ground <br /> Well Elev. to Floating Water Ethyl- Total <br /> Sample Sample Depth (ft. Water Product ElevationTPIIg Benzene Toluene benzene Xylenes <br /> No Date (ft.) MSL) (ft.) (ft.) (ft.MSL) b) (ppb) (ppb) (ppb) <br /> t <br /> MW-3 unpr 4/30/02 30 568 1343 00 -775 <5,000 <50 <50 <50 <50 <br /> MW-3 HCL 4/30/02 -- -- -- -- <5,000 <50 <50 <50 <50 <br /> MW-3 TSP 4/30/02 -- -- -- -- -- <5,000 <50 <50 <50 <50 <br /> MW-7 unpr 4/30/02 40 569 1346 00 -777 <10,000 <10 <10 <10 <10 <br /> MW-7 HCL 4/30/02 -- -- -- -- -- <10,000 <10 <1 0 <1 0 <1 0 <br /> MW-7 TSP 4/30/02 -- -- -- -- -- <10,000 <100 <100 <100 <100 <br /> Sample Sample MTBE TBA DIPE ETBE TAME Ethanol 1,2-DCA 1,2-DBA <br /> No. Date (ppb) 4Ppb) b) b) (ppb) (ppb) (ppb) (ppb) <br /> MW-3 unpr 4/30/02 72 220,000 <50 <50 <50 <2,000 <50 <50 <br /> MW-3 HCL 4/30/02 71 230,000 <50 <50 <50 <2,000 <50 <50 <br /> MW-3 TSP 4/30/02 66 230,000 <50 <50 <50 <2,000 <50 <50 <br /> MW-7 unpr 4/30/02 120 210,000 <10 <100 <10 <10 <10 <10 <br /> MW-7 HCL 4/30/02 110 210,000 <10 <100 <10 <10 <10 <1 0 <br /> MW-7 TSP 4/30/02 110 210,000 <100 <100 <100 <1,000 <100 <100 <br /> ANALYTICAL METHODS. EXPLANATION: <br /> TPHg=Total Petroleum Hydrocarbons as gasoline according to EPA Method 82600..,, ft =feet <br /> Benzene,Toluene,Ethylbenzene,and Total Xylenes according to EPA Method 8260B") Elev ft MSL=Elevation in feet relative to Mean Sea Level <br /> MTBE=methyl tertiary butyl ether according to EPA Method 8260B -� ppb=parts per billion <br /> TBA=tertiary butyl alcohol according to EPA Method 8260E <5,000=not detected at or above the laboratories reporting limit <br /> DIPE=di-isopropyl ether according to EPA Method 8260E ---=not applicable <br /> ETBE=ethyl tertiary butyl ether according to EPA Method 8260B unpr=unpreserved <br /> TAME=tertiary amyt methyl ether according to EPA Method 8260B HCL=hydrochloric acid preservative <br /> ethanol according to EPA Method 8260B TSP=tn-sodium phosphate preservative <br /> 1,2-DCA=1,2-Dichloroethane according to EPA Method 8260B <br /> 1,2-DBA=1,2-Dibromoethane according to EPA Method 8260B ANALYTICAL LABORATORY: <br /> KIFF Analytical LLC(ELAP No 2236) <br /> 1 = Well elevations reported as top of casing(TOC)as surveyed by <br /> Virgil Chavez,Licensed California Land Surveyor No 6323 <br /> 140245 08 1 <br />