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Page 2 of 2 - <br /> S Tie • <br /> Groundwater Elevation and Analytical Data <br /> Former ARCO Service Station#4493 <br /> 205 North Center Street <br /> Stockton,Cahfomia <br /> Well Depth Groundwater Change in TPH as Ethyi- <br /> Well Date Elevation to Water Bevatlon Groundwater Gasoline Benzene Toluene benzene Xylenes MtBE Mt$E(8260) DO <br /> Number Sampled (feet,MSL) (feet TOC) (feet,MSL) (feet,MSL) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mgll <br /> 06/19/00 P 1203 1298 -095 -- <50 275 <0 500 <0 500 <0 500 <2 50 <2 0 209 <br /> MW-5 09/19/00 P 1365 -162 -067 <50 1 19 <0 500 <0 500 <0 500 <2 50 <2 0 0 6 <br /> 11/30/00 P 1488 -286 -123 <50 0 0 694 <0 500 <0 500 <0 500 -- <2 00 121 <br /> 06/19/00 P 13 26 1381 -0 55 -- <50 187 <0 500 0 523 2 34 171 144 183 <br /> MW-6 09V19/DO P 1456 -130 -075 <50 130 <0 500 <0 500 <0 500 119 102 0 7 <br /> 11/30/00 P 1579 -2.53 -123 <50 0 <0 500 <0 500/2 08` <0 500 <0 50018 00' — 412 064 <br /> 06/19/00 P 1107 1187 -0 80 -- <50 <0 Soo <0 500 <0 500 <0 500 <2 50 <2 0 178 <br /> MW-7 09/19/00 P 12 59 -152 -072 <50 <0 500 <0 500 <0 500 <0 500 <2 50 <2 0 10 <br /> 11130/00 P 1383 -2.76 -124 <50 0 <0 500 <0 500/3 80• <0 500 <0 500/8 96' — 234 062 <br /> TOC =Top of casing <br /> MSL =Mean Sea Level <br /> TPH =Total petroleum hydrocarbons <br /> MTBE =Methyl Cert-butyl ether <br /> DO =Dissolved oxygen <br /> `or 8260 =determined by(LISEPA Method 8260) <br /> ppb =Parts per billion <br /> mgA =milligrams per liter <br /> P =Well purged prior to sample collection <br /> NP =Well not purged prior to sample collection <br /> -- =Not measured or sampled <br /> < =below detection limit <br />