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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 msi) (feet bgs) (feet msl) (pg1L) (pg1L) (pg/L) (pg/L) (pg/L) (pg/L) W910 (mg1L) Comments <br /> MW-5 2/15/2001 — 4361 2088 2273 <50 <0 5 <05 <0 5 <05 <25 <br /> 6/1/2001 4361 2122 2239 <50 — <05 <05 <0 5 <05 <2 5 -- <br /> 9/11/2001 -- 4361 2-248 2113 <50 -- <05 <05 <0 5 <0 5 <2 5 2 5 <br /> 12/20/2001 — 4361 2225 2136 <50 — <05 <05 <0 5 <05 <2 51<2 0* 21 <br /> 3/20/2002 — 4361 2102 2259 <50 — <05 <05 <0 5 <0 5 <2 5/<0 5* 35 <br /> 6/20/2002 P 4361 21 95 21 66 <50 — <05 <0 5 <0 5 <0 5 <0 50* 4 <br /> 9/24/2002 P 4361 2257 2104 <50 -- <05 <0 5 <0 5 <0 5 <0 50* NA <br /> 11/27/2002 P 4361 21 91 2170 <50 -- <05 <05 <0 5 <0 5 <0 50* 5 6 <br /> 02/17/2003 NP 4361 2207 2154 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 43 <br /> 04/28/2003 P 4361 2223 2138 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 5 3 <br /> 07/28/2003 P 4361 2314 2047 <50 -- <0 50 <050 <0 50 <0 50 <0 50* 46 <br /> 11/26/2003 P 4361 2319 2042 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 4 8 <br /> 02/16/2004 P 4361 2351 2010 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 4 5 <br /> 05/26/2004 P 4361 2358 2003 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 51 <br /> 08/05/2004 P 1 4361 1 2478 1 1883 1 <50 -- <0 50 I <0 50 1 <0 50 1 <0 50 1 <0 50` 1 4 5 <br /> MW-6 2/15/2001 — 4365 2092 2273 <500 -- <5 <5 <5 <5 1 260 -- <br /> 6/1/2001 -- 4365 21 27 2238 <500 — <5 <5 <5 <5 4,200 -- <br /> 9/11/2001 — 4365 2251 2114 <5,000 <50 <50 <50 <50 3,800 0 8 <br /> 12/20/2001 -- 4365 2232 21 33 <50 -- <05 <0 5 <0 5 <0 5 74/2,400* 1 3 <br /> 3/20/2002 -- 4365 2106 2259 <50 -- <05 <05 <0 5 <05 2701270* 12 <br /> 6/20/2002 P 4365 2200 2165 150 — <0 5 <0 5 <0 5 <0 5 260* 1 5 <br /> 9/24/2002 P 4365 2262 2103 <50 -- <0 5 <0 5 <0 5 <0 5 770* NA <br /> 11/27/2002 P 4365 21 95 2170 <5,000 — <50 <50 <50 <50 2,200* 1 2 <br /> 02/17/2003 P 1 4365 2211 2154 <5,000 - <50 <50 <50 <50 340* 2 0 <br /> 04/28/2003 P 4365 2228 2137 100 -- <0 50 <0 50 <0 50 <0 50 230* 34 <br /> 07/28/2003 P 4365 2319 2046 88 R -- <2 5 <2 5 <2 5 <2 5 200* 2 0 <br /> 11/2612003 P 4365 2324 2041 99 R — <0 50 <050 <0 50 <0 50 170* 12 <br /> 02/16/2004 P 4365 2353 2012 <50 -- <2 5 <2 5 <2 5 <2 5 59* 16 <br /> 05/26/2004 P 1 4365 2362 2003 1 <50 - <10 <10 <1 0 <1 0 74* 20 <br /> 108105120041 P 1 4365 2481 1 1884 <50 1 -- <0 50 1 <050 1 <0 50 1 <0 50 1 32* 1 17 <br /> MW-7 2/15/2001 -- 4306 2025 2281 <50 — <05 <0 5 <0 5 <0 5 <2 5 - <br /> 6/1/2001 4306 2060 2246 <50 — <05 <0 5 <0 5 <0 5 <25 -- <br /> Report Date September 23,2004 Page f of 5 <br />