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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 Ground«Nzter Tom <br /> Well Date Ele,.ationi Liquid Product EleN ation TPHg Benzene Toluene Ethylbenzene Xylenes <br /> ID Sampled (feet MSL) (feet) (feet) (feet MSL) (ppb) (ppb) ( W- (ppb) (ppb) <br /> UV-1 12/15/97 1105 3202 000 -2097 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) (PO) (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 Analtiical Methods <br /> BTEX=benzene,toluene,ethylbenzene, and total xylenes TPHg,BTEX=EPA Methods 8015Mod 18020 <br /> TBA=tertbutanol Ethanol,TBA,MTBE,DIPE, ETBE,TAME=EPA Method 8260 <br /> MTBE=methyl tert-butyl ether <br /> TAME=tert-amyl methyl ether Laboraton <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, relate a to mean sea le-s el <br /> ----=not aN ailable/not applicable <br /> i Casing elevation from MPDS Report No UN0187-13,dated August 29, 1997 <br /> 482707 <br />