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I"ahlc i Groundwater Elevation and Analytical Data Former ARCO Service Station#4493 205 North Center Street Stockton,Cafifarrsia Well Depth Groundwater Change'n TPH as Ethyl- Well Date Elevation to Water Elevation Groundwmter Gasoline Benzene Toluene benzer:a Xylenes MtBE DQ Number Sam (feet,MSL) Meet,TOC) (feet,MSL) (feet,MSL) (Mb) _(ppb) (ppb) (ppb) (ppb) (ppb) mg;L MW-1 2116199 11.94 13.35 -141 231 135 NO 237 NE NO' - 3110199 13.01 -1.07 0.34 - - - - 06/17/99 11.89 0.05 1.12 <50 3.52 <0.5 <0 5 3 C7 0, - 09/24/99 -------- Well lnaccessab!e----- - 12116/99 NP 14.38 -2.45 - <50 US <0.5 <0,5 3.0Z <2.50 2.9 MW-2 2116199 12.43 14.56 -213 - ND ND ND N ND ND° - 3110199 13.70 -1.27 0.88 - -- -- -- -- 06/17l99 12.52 -0.09 1.18 <50 <0.5 <0.5 <0.5 c0 5 <2.0" - 09/24/99 NP 12.24 0.19 US <50 <0.5 <0.5 <0.5 <135 <5 0 4.2 12116199 NP 15.29 -2.86 3.C5 <50 <0.5 <0.5 c0.5 <0.5 :2.50 4.3 MW-3 2116/99 12.51 14.54 -2.13 - ND NO N ND ND 70-� 3110/99 13.99 -1.48 0.65 - -- - - 06/17/99 12.97 -0.46 1.02 <50 <0.5 <0.5 <0.5 225 44e 09/24/99 ----- Welllnaccessable-- - 12/16/99 NP 15.53 .3.02 <50 <0.6 <0.5 <0.5 <0.5 <2.60 4.1 MW-4 2/16199 12.19 14.41 -2.22 - 15,000 503 ND 707 1,550 9.990b - 3/10/99 13.61 -1.42 0.8 - - - - 8/17/99 12.43 -0.24 1.18 10,800 230 17.7 597 936 765` - 09/24/99 NP 12.72 -0.53 -0.29 4,880 173 <10.0 262 e.0 570 4.9 12/16/99 NP 16.17 -2.98 -2.46 7,830 260 <10.0 670 113 1,310 1.9 TOC =Tap of casing MSL =Mean Sea Level TPH =Total petroleum hydrocarbons ppb =Parts per billion P =Well purged prior to sample collection NP =Well not purged prior to sample collection < =below detection limit a =Samples were analyzed for TBA,RIPE,EtBE,TAME,and 1,2-DCA by EPA Method by 8260. Al oxygenates were reported non-detect b =Samples were analyzed for TBA,DIPS,EtBE,TAME,and 1,2-DCA by EPA Method by 8280. Al oxygenates except"BE were reported non-de'.ecl NO =Sample reported as non-detect. 077.41819.0021GW Tables I