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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) (pg/L) Wg/L) (pg/L) (Ug/L) (pglL) (U91L) (pg/L) (mg/L) Comments <br /> MW-6 11/12/2004 P 4365 2335 2030 <50 -- <0 50 <0 50 <0 50 <0 50 6 4'J 370 <br /> 02/11/2005 P 4365 2250 1 21 15 <50 — <0 50 <0 50 <050 <0 50 9 9' 310 <br /> 05!3'!!2005 P 43 65 2204 2161 <50 — <0 50 <0 50 <0 50 <0 50 3 7*J 360 <br /> MW-7 2/15/2001 — 4306 2025 2281 <50 - <05 <0 5 <0 5 <0 5 <25 -- <br /> 6(1/2001 -- 4306 2060 2246 <50 — <05 <0 5 <0 5 <0 5 <25 — <br /> 9/11/2001 -- 4306 2186 2120 <50 — <05 <05 <0 5 <0 5 <25 19 <br /> 12/20/2001 -- 4306 — -- -- — — — — -- — -- Well Inaccessible <br /> 3/20/2002 -- 4306 2040 2266 <50 — <0 5 <05 <0 5 <0 5 <2 51<0 5' 18 <br /> 6/20/2002 P 4306 21 34 21 72 <50 - <05 <05 <0 5 <0 5 <0 5' 28 <br /> 9/24/2002 P 4306 2194 2112 <50 -- <0 5 <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 21 63 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50' 260 <br /> 04/28/2003 P 4306 21 61 2145 <50 - <0 50 <0 50 <0 50 <0 50 <0 50" 330 <br /> 07/28/2003 P 4306 2251 2055 <50 -- <050 <0 50 <0 50 <050 <0 50' 370 <br /> 11!26/2003 P 4306 2260 2046 <50 — <0 50 <0 50 <0 50 <0 50 <0 50' 220 <br /> 02/16/2004 P 4306 2295 2011 <50 — <0 50 <0 50 <0 50 <0 50 <0 50" 270 <br /> 05/26/2004 P 4306 2298 2008 <50 -- <0 50 <0 50 <050 <0 50 <0 50' 240 <br /> 08/05/2004 P 4306 2415 1891 <50 — <0 50 <050 <0 50 <0 50 <0 50` 310 <br /> 11/12/2004 P 4306 2266 2040 <50 -- <0 50 <0 50 <050 <0 50 <0 50' 209 <br /> 0211112005 P 4306 21 85 2121 <50 — <0 50 <0 50 <0 50 1 <0 50 <0 50` 410 <br /> 0513112005 P 4306 2138 21 66 1 <50 — <0 50 <0.50 <0 50 <0 50 <0 50` 320 <br /> MW-8 2/15/2001 -- 4341 2042 2299 <50 — <05 <0 5 <0 5 <0 5 <25 — <br /> 6/1/2001 — 4341 2076 2265 <50 — <05 <0 5 <0 5 <0 5 <25 — <br /> 9/11/2001 — 4341 2195 2146 <50 — <05 <05 <0 5 <0 5 <2 5 19 <br /> 12/20/2001 — 4341 2183 2158 <50 — <05 <0 5 <0 5 <0 5 <2 512 6' 19 <br /> 3/20/2002 — 4341 2059 2282 <50 — <0 5 <0 5 <0 5 <0 5 <2 51<0 5' 19 <br /> 6/20/2002 P 4341 2157 2184 <50 -- <0 5 <0 5 <0 5 <0 5 <0 5' 2 8 <br /> 9/24/2002 P 4341 2218 2123 <50 — <05 <0 5 <0 5 <0 5 <0 50' — <br /> 11/27/2002 P 4341 2156 2185 <50 — <05 <05 <0 5 <0 5 <0 5' 36 <br /> 02/17/2003 NP 4341 2164 21 77 <50 — <0 50 <0 50 <0 50 <0 50 <0 50" 240 <br /> 104/28/20031 P 4341 1 2181 2160 <50 <0 50 <0 50 <0 50 <0 50 <0 50" 250 <br /> 07/28/2003 P 43 41 22 7i 20 70 1 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50' 210 <br /> Report Date July 21,2005 _ Page 2 of 6 <br />