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Table 1. Groundwater Monitoring and Analytical Data <br /> Former Unocal Service Station No. 0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> Casing Depth to Floating Groundwater Total <br /> Well Date Elevation' Liquid Product Elevation TPHg Benzene Toluene Ethylbenzene Xylenes <br /> ID Sampled (feet MSL) (feet) (feet) (feet MSL) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> UV-1 12/15/97 11.05 32.02 0.00 -20.97 120,000 6,200 23,000 2.800 16,000 <br /> Trip Blank 12/15/97 ---- ---- ---- ---- <50 <0.50 <0.50 <0.50 <0.50 . <br /> Well Date Ethanol TBA MTBE DIPE ETBE TAME <br /> ID Sampled (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> UV-1 12/15/97 <50,000 <10.000 <200 <200 <200 <200 <br /> Trip Blank 12/15/97 NA NA NA NA NA NA <br /> TPHg=Total Petoleum Hydrocarbons as gasoline Analtvical Methods <br /> BTEX=benzene,toluene,ethylbenzene, and total x lens TPHg,BTEX=EPA Methods 8015Mod./8020 <br /> TBA=tert-butanol Ethanol,TBA,MTBE,DIPS, ETBE,TAME=EPA Method 8260. <br /> MTBE=methvl tert-butyl ether <br /> TAME=tert-amyl methyl ether Laboratory <br /> DIPE=di-isopropyl ether Sequoia Analytical(FLAP#1210) <br /> ETBE=ethyl tert-butyl ether <br /> ppb=parts per billion . <br /> NA=not analyzed for this constituent <br /> feet MSL=in feet, relative to mean sea level <br /> ----=not available/not applicable <br /> ' Casing elevation from MPDS Report No. UN0187-13, dated August 29, 1997. <br /> 4827.07 <br />