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I <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 6020 <br /> 1711 E Yosemite Avenue, Manteca, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg1L) (pg/L) (pglL) (ug/L) (ug/L) (pg/L) (pg/L) (mg/L) Comments <br /> MW-7 9/11/2001 — 4306 2186 2120 <50 - <05 <0 5 <0 5 <0 5 <25 19 <br /> 12/20/2001 — 4306 — -- — -- -- — -- — -- -- Weil Inaccessible <br /> 3/20/2002 -- 4306 2040 2266 <50 — <05 <05 <0 5 <0 5 <2 5/<0 5* 18 <br /> 6121 012002 P 4306 21 34 2172 <50 -- <05 <05 <0..5 <0 5 <0 5* 2 8 <br /> 9/24/2002 P 4306 21 94 21 12 <50 — <05 <05 <0 5 <0 5 <0 5* NA <br /> 11/27/2002 P 4306 2131 2175 <50 — 78 4 5 1 8 0 55* 32 <br /> 02/17/2003 NP 4306 2143 2163 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 26 <br /> 0412812003 P 1 4306 2161 2145 <50 - <0 50 1 <0 50 <0 50 <0 50 <br /> <0 50* 33 <br /> 07128/2003 P 4306 2251 2055 <50 - <0 50 <0 50 <050 <0 50 <0 50* 3 7 <br /> 11/26/2003 P 4306 2260 2046 <50 — <0 50 <05o <0 50 <0 50 <0 50* 22 <br /> 02/16/2004 P 4306 2295 2011 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 27 <br /> 05/26/2004 P 4306 2298 2008 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 24 <br /> 08/05/2004 P 4306 2415 1891 <50 — <0 50 <0 50 1 <0 50 <0 5o <0 50" 31 <br /> MW-8 2/15/2001 -- 4,341 2042 2299 <50 — <0 5 <05 <0 5 <0 5 <25 — <br /> 6/1/2001 — 4341 2076 2265 <50 -- <0 5 <0 5 <05 <0 5 <25 — <br /> 9/11/2001 -- 4341 21 95 2146 <50 -- <05 <0 5 <0 5 <05 <2 5 19 <br /> 12/20/2001 — 4341 2183 2158 <50 - <05 <0 5 <05 <0 5 <2 512 6* 19 <br /> 3/20/2002 -- 4341 2059 2282 <50 - <0 5 <05 <0 5 <0 5 <2 5/<0 5* 1 9 <br /> 6/20/2002 P 4341 2157 2184 <50 — <0 5 <05 <0 5 <0 5 <0 5* 2 8 <br /> 9/24/2002 P 4341 2218 21 23 <50 — <0 5 <0 5 <0 5 <05 <0 50* — <br /> 11/27/2002 P 4341 2156 2185 <50 — <05 <0 5 <0 5 <0 5 <0 5* 36 <br /> 02/17/2003 NP 4341 2164 2177 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 24 <br /> 04/28/2003 P 4341 21 81 2160 <50 -- <050 <0 50 <0 50 <0 50 <0 50* 25 <br /> 07/28/2003 P 4341 2271 2070 <50 -- <0 50 <0 50 <050 <0 50 <0 50* 21 <br /> 11/2612003 P 4341 2282 2059 <50 <0 50 <0 50 <0 50 <0 50 <0 50* 23 <br /> 02/16/2004 P 4341 2314 2027 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 46 <br /> 05/26/2004 P 4341 2324 2017 <50 -- <050 <0 50 <0 50 <0 50 <0 50* 21 <br /> 08/05/2004 P 4341 2440 1901 <50 -- <0 50 <050 <0 50 1 <0 50 1 <0 50* 1 26 <br /> MW-9 2/15/2001 4369 2080 2289 <50 <05 <0 5 <0 5 <0 5 <25 -- <br /> 6/j/2001 4369 2118 2251 <50 -- <0 5 <05 <p 5 <05 <2 5 <br /> 9/11/2001 — 4369 2241 21 28 <50 -- <0 5 <05 <0 5 <0 5 <2 5 1 4 <br /> 12/20/2001 -- 4369 2223 2146 <50 -- <05 <0 5 <0 5 <0 5 <2 51<2 0* 21 <br /> Report Date September 23,2004 _ __ Page 2 of 5 <br />