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i • _ <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> Former ARCO Service Station#4493 <br /> 205 North Center Street <br /> Stockton,California <br /> Well Depth Groundwater Change in TPH as Ethyl- <br /> Well Date Elevation to Water Elevation Groundwater Gasoline Benzene Toluene benzene Xylenes MtBE <br /> Number Sampled (feet,MSL) (feet,TOC) (feet,MSL) (feet MSL) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-1 2/16/1999 11.94 13.35 -1.41 -- 231 1.35 ND 2.37 ND ND' <br /> 3110/1999 13.01 -1.07 0.34 - - -- -- - - <br /> 06l17199 11.89 0.06 1.12 <50 3.52 <0.5 <0.5 3.02 <2.0° <br /> MW-2 2116/1999 12.43 14.56 -2.13 - ND ND ND ND ND N08 <br /> 3/10/1999 13.70 -1.27 0.86 - - -- - - <br /> 06/17/99 12.52 -0.09 1.18 <60 <0.5 <0.5 <0.5 <0.5 <2.0' <br /> MW-3 2/16/1999 12.51 14.64 -2.13 - ND ND ND ND ND 7.06 <br /> 3/10/1999 13.99 -1.48 0.65 -- -- -- - - <br /> 06/17/99 12.97 -0.46 1.02 <60 <0.5 <0.5 <0.5 2.26 44° <br /> MW4 2/16/1999 12.19 14.41 -2.22 - 15,000 503 ND 707 1,550 9,990 <br /> 3110/1999 13.61 -1.42 0.8 -- - -- - -- <br /> 6/1711999 12.43 -0.24 1.18 10,800 230 17.7 597.00 936 766h <br /> � fr <br /> TOC =Top of casing <br /> MSL =Mean Sea Level <br /> TPH =Total petroleum hydrocarbons <br /> ppb =Parts per billion <br /> < =below detection limit <br /> a =Samples were analyzed for TBA,DIPE,EtBE,TAME,and 1,2-DCA by EPA Method by 8260. All oxygenates were reported non-detect. <br /> b =Samples were analyzed for TBA,DIPE,EtBE,TAME,and 1,2-DCA by EPA Method by 8260. All oxygenates except MtBE were reported non-detect. <br /> ND =Sample reported as non-detect. <br /> I <br /> 077.41819.0011GW Tables <br /> I <br />