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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 760 <br /> 225 S Cherokee, Lodi CA <br /> Top of Depth to Water Level Ethyl- Total <br /> Well Date P1 Casing Water Elevation TPI-Ig TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP Elevation (feet bgs) (feet msl) (pg/L) (pglL) (pg1L) (pg/L) (pg/L) (pg1L) (pg/L) (mg1L) Comments <br /> MW-1 10/3/2002 P 5291 6060 -769 <50 — <0 5 <0 5 <0 5 <0 5 091 — <br /> 01/30/2003 P 5291 5701 -410 <50 -- <0 50 <0 50 <0 50 1 2 057 20 <br /> 04/10/2003 P 5291 5667 -376 <50 <0 50 <0 50 <0 50 <0 50 1 6 080 <br /> i <br /> 07/24/2003 P 5291 5982 -691 <50 <0 50 <0 50 <0 50 <0 50 076 32 <br /> 10/17/2003 P 5291 61 14 -823 <50 -- <0 50 <0 50 <0 50 <0 50 055 1 5 <br /> 01121/2004 P 5291 5811 -520 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 11 <br /> MW-2 10/3/2002 P 5327 6091 -764 410 — 32 85 6 95 37 -- <br /> 01130/2003 P 5327 5735 -408 <50 UJ — <0 50 UJ <0 50 <0 50 UJ 12 J <0 50 UJ 1 1 <br /> UJ <br /> 04/10/2003 P 5327 5707 -380 130 — <0 50 <0 50 <0 50 16 056 090 <br /> 07/2412003 P 5327 6022 -695 300 — 22 <1 0 <1 0 29 63 20 <br /> 10/17/2003 P 5327 61 52 -825 80 -- <0 50 <0 50 <0 50 066 30 10 <br /> 01/21/2004 P 5327 5841 -514 <50 -- <0 50 <0 50 <0 50 <0 50 056 090 <br /> MW-3 10/3/2002 P 5438 6073 -635 140 -- <0 5 <0 5 1 089 <0 5 — <br /> 01/30/2003 P 5438 5834 -396 130 — <0 50 <0 50 <0 50 078 <0 50 21 <br /> 04/10/2003 P 5438 5741 -303 140 -- <0 50 <0 50 <0 50 1 1 068 18 <br /> 07/24/2003 P 5438 61 17 -679 160 — <0 50 <0 50 <0 50 055 <0 50 43 <br /> 10/17/2003 P 5438 6249 -811 93 — <0 50 <0 50 <0 50 <0 50 <0 50 21 <br /> 01/21/2004 P 5438 5945 -507 410 -- <0 50 <0 50 <0 50 <0 50 <0 50 25 <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 /> ME=Methyl tert-butyl ether <br /> DO=Dissolved oxygen <br /> msl=mean sea level <br /> bgs=below ground surface <br /> pg/L=micrograms per liter <br /> mg/L=milligrams per liter <br /> P/NP=purged/not purged <br /> <=below given laboratory detection limit <br /> --=not measured or analyzed <br /> Data Qualifier Definitions <br /> U=The analyte was analyzed for,but was not detected above the sample reporting limit <br /> J=The analyte was positively identified,the associated numerical value is the approximate concentration of the analyte in the sample <br /> N=The analysis indicates the presence of an analyte for which there is presumptive evidence to make a tentative identification <br /> NJ=The analysis indicates the presence of an analyte that has been tentatively identified and the associated numerical value represents its approximate concentration <br /> UJ=The analyte was not detected above the reported sample reporting limit However,the reported reporting limit is approximate and mayor may not represent the actual limit of quantitation <br /> Report Date April 28,2004 Page 1 of 2 <br />