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• s <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station #6020 <br /> 1711 E Yosemite, Manteca CA <br /> Top of Casing Depth to Water Level Ethyl- Total <br /> Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msq (pglL) (pglL) (pgIL) (pg/L) (pglL) (pg/L) (p91L) (mg/L) Comments <br /> MW-10 2/15/2001 - 4209 1902 2307 <50 — <0 5 <0 5 <0 5 <0 5 <2 5 - <br /> 6/1/2001 4209 1940 2269 <50 — <0 5 <0 5 <0 5 <0 5 <2 5 — <br /> 9/11/2001 — 4209 2097 2112 <50 — <0 5 <05 <0 5 <0 5 <2 5 1 8 <br /> 12/20/2001 -- 4209 2032 2177 <50 -- <0 5 <0 5 <0 5 <0 5 <2 5/<2 0* 27 <br /> 3/20/2002 — 4209 1921 2288 <50 — <0 5 <0 5 <0 5 <0 5 <2 51<0 5 27 <br /> 6/20/2002 P 4209 2018 2191 <50 — <0 5 <0 5 <0 5 <05 <0 5* 26 <br /> 9/24/2002 P 4209 2081 2128 <50 -- <0 5 <0 5 <0 5 <0 5 <0 5* NA <br /> 11/27/2002 P 4209 2024 2185 <50 -- 074 <0 5 <0 5 <05 <0 5* 47 <br /> 02/17/2003 NP 4209 2023 2186 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 32 <br /> 04/28/2003 NP 4209 2040 2169 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 47 <br /> 07/28/2003 P 4209 21 30 2079 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 38 <br /> 11/26/2003 P 4209 2148 2061 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 32 <br /> 02/16/2004 P 4209 2111 2098 <50 .. <0 50 <0 50 <0 50 <0 50 <0 50* 42 <br /> 03/11/2004 P 4209 2122 2087 •- — — — — -- -- <br /> MW-11 07/28/2003 P 4418 2370 2048 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 42 <br /> 11/26/2003 P 4418 2378 2040 <50 -- <0 50 073 <0 50 054 <0 50* 48 <br /> 02116/2004 P 4418 2402 2016 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 30 <br /> MW-12 07/28/2003 P 4383 2335 2048 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 30 <br /> 11/26/2003 P 4383 2339 2044 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 25 <br /> 02/16/2004 P 4383 2364 2019 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 20 <br /> MW-13D 07/28/2003 P 4351 2426 1925 <50 — <0 50 <0 50 <0 50 <0 50 7 8* 31 <br /> 11/2612003 P 4351 2419 1932 <50 -- 050 083 <0 50 060 2 6* 15 <br /> 02/16/2004 P 4351 2441 1910 <50 — <0 50 052 <0 50 053 2 7* 22 <br /> QCTB 3/20/2002 — — — — <50 -- <0 5 <0 5 <0 5 <0 5 <2 5 -- <br /> TB-1 12/20/2001 -- - — I — <50 -- <0 5 <0 5 <0 5 <0 5 <2 5 — <br /> TPHg=Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics in analytical report) <br /> TPHd=Total petroleum hydrocarbons as diesel(reported as DRO-diesel range organics in the analytical report) <br /> MtBE=Methyl tert-butyl ether <br /> DO=Dissolved oxygen <br /> bgs=below ground surface <br /> msl=mean sea level <br /> pg/L=micrograms per liter <br /> mg/L=milligrams per liter <br /> PINP=purged/not purged <br /> <=below given laboratory detection limits <br /> 1 <br /> Report Date Apnl 16, 2004 Page 3 of 4 <br />