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til <br /> Table 1. Groundwater Monitoring Y and Analytical Data <br /> Tosco Facility No 6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Casing Depth to Floating Groundwater <br /> Well Date Elevation' Liquid Product Elevation Methanol Ethanol TBA MTBE DIPE ETBE TAME <br /> II <br /> ID Sampled (feet MSL) (feet) (feet) (feet MSL) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-1 Well paved over 11 <br /> MW-2 12/8/97 1156 3614 000 -2458 2 0 <1,700 <330 390 <6 7 <6 7 <6 7 <br /> MW-3 Well destroyed <br /> MW-4 12/8/97 1163 35 74 000 -24 11 <1 0 <500 <100 75 <2 0 <2 01 <2 0 <br /> MW-5 1218197 1176 3605 000 -2429 <1 0 <500 <100 43 <2 0 <2 0' <2 0 <br /> MW-6 12/8/97 1143 3565 000 -2422 <1 0 <500 <100 <2 0 <2 0 <2 0 <2 0 <br /> MW-7 12/8/97 1182 3637 000 -2455 <1 0 <500 <100 69 <2 0 <2 0 <2 0 <br /> MW-8 Well paved over <br /> MW-9 12/8197 1176 35 78 000 -2402 <1 0 <500 <100 <2 0 <2 0 <2 0 <2 0 <br /> MW-10 Well destroyed _ <br /> MW-11 Well paved over <br /> MW-12 Well destroyed <br /> MW-13 Well destroyed <br /> VW-1 12/8/97 ---- 3562 000 ---- <1 0 <500 <100 <2 0 <2 0 <2 0' <2 0 <br /> VW-2 Well connected to VES <br /> VW-3 12/8/97 ---- 3575 000 --- <1 0 <500 <100 <2 0 <2 0 <2 0 <2 0 <br /> VW-4 Well connected to VES <br /> VW-5 Well connected to VES <br /> VW-6 Well connected to VES <br /> Trip Blank 12/8/97 ---- --- ---- ---- <1 0 <500 <100 <2 0 <2 0 <2 0 <2 0 <br /> Explanation Analtyical Methods <br /> TBA=tert-butanol DIPE=di-isopropyl ether Ethanol,TBA,MTBE,DIPS,ETBE,TAME=EPA Method 8260 <br /> MTBE=methyl tert-butyl ether ETBE=ethyl tert-butyl ether Methanol=Industrial solvent Scan <br /> TAME=tert-amyl methyl ether ppb=parts per billion <br /> feet MSL=in feet,relative to mean sea level Laboratory <br /> ----=not available/not applicable Sequoia Analytical(ELAP#1210) <br /> 1 Casing elevations from MPDS Report No UN6981-15, dated August 18, 1997 r <br /> I <br /> 7855 22 <br /> W. <br />