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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 DO <br /> Number Sampled (feet,MSL) (feet,TOC) _(feet,MSL) (feet,MSL) (ppb) (ppb) (ppb) (ppb) (ppb) t'ppb) mg/L <br /> MW-1 2/16/1999 11.94 13.35 -1.41 -- 231 1.35 ND 2.37 ND ND° -- <br /> 3/10/1999 13.01 -1.07 0.34 -- -- -- _ _ - - <br /> <50 3.52 <0.5 <0.5 3.G2 <2.0° <br /> 06!17199 11.89 0,05 1.12 - <br /> 09124199 ------Well Inaccessable- - <br /> MW-2 2/16/1999 12.43 14.56 -2.13 -- ND ND ND ND ND ND' -- <br /> 3/10/1999 13.70 -1.27 0.86 -- - - -- - -- - <br /> 06/17/99 12..52 -0.09 1.18 <50 <0.5 <0.5 <0.5 <0.5 <2.0° - <br /> 09/24/99 NP 12.24 0.19 0.28 <50 <0.5 <0.6 <0.5 <0.6 <5.0 4.2 <br /> MW-3 2/1611999 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 <50 <0.5 <0.5 <0.5 2.26 144° - <br /> 09/24199 Well lnaccessable - <br /> MW-4 2/16/1999 12.19 14.41 -2.22 - 15,000 503 ND 707 1,550 9,990, - <br /> 3/10/1999 13.61 -1.42 0.8 -- -- - -- -- -- - <br /> 6/17/1999 12.43 -0.24 1.18 10,800 230 17.7 597 936 766° -- <br /> 09124199 NP 12.72 -0.53 -0.29 4,880 173 <10 262 <10 670 4.9 <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,ELBE,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 /> 077.41819.0021GW Tables <br />