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Table 2 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No. 548 <br /> 1612 W . Hammer Lane, Stockton , 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) (pg/L) (pg/L) (pg/L) WWL) (pg/L) (,ng/L <br /> (mg/L) Comments <br /> VW-5S 12/18/2000 -- -- 11 ,48 -- -- - -- -- -- -- -- -- No FP, No S, No O Not <br /> 3/14/2001 -- 10.44 -- _ _ _ _ scheduled for sampling <br /> -- - -- -- No FP, No S, No O Not <br /> scheduled for sampling <br /> 6/19/2001 -- 14.23 - -- -- - -- -- -- -- - No FP, No S, No O Not <br /> scheduled for sampling <br /> 9/11 /2001 - - 13.87 -- -- -- - -- -- - - - No FP, No S, No O Not <br /> scheduled for sampling <br /> 12/13/2001 "- - "" -" -- No FP, No S, No O Not <br /> scheduled for sampling <br /> 3/1212002 NP -- 9.75 - <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] -- No FP, No S, No O <br /> 6/17/2002 NP -- 13.07 -- 190[3] -- <0.50 <0.50 <0.50 6.3 0.53[2] -- No FP, No S, No 0 <br /> 9/9!2002 NP -- 12.73 -- <50 -- <0.5 <0.5 <0.5 <0.5 <0.5 - No FP, No S, No O <br /> 12/4/2002 NP -- 8.67 -- <50 -- <0.5 <0.5 <0.5 <0.5 <0.5 -- No FP, No S, No O <br /> 03/03/2003 NP -- 11 .04 - <50 - <0.50 <0.50 <0.50 <0.50 <0.50[21 -- <br /> 06/03/2003 NP -- 10.88 - <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] - <br /> 09/18/2003 -- -- - -- <br /> '- '- - -- - -- -- - Well dry <br /> 12/08/2003 - - -- - - -- -- - - -- -_ - Muddy bottom, Dry, Not <br /> Sampled <br /> 03/11/2004 NP - 10.27 - 21 ,000 R - 170 R 270 R 820 R 8,600 R <100 [21R - <br /> 05/03/2004 NP - 13.55 - <50 -- <0.50 <0.50 <0.50 <0.50 <0.50[2] <br /> TPHg = Total petroleum hydrocarbons as gasoline (reported as GRO-gasoline range organics in analytical report) <br /> TPI-Id = Total petroleum hydrocarbons as diesel (reported as DRO-diesel range organics in the analytical report) <br /> MtBE - Methyl tert-butyl ether. <br /> TOC = Top of Casing <br /> DO = dissolved oxygen <br /> bgs = below ground surface <br /> msl = mean sea level <br /> pglL = micrograms per liter <br /> mg/L = milligrams per liter <br /> P/NP = purged/not purged <br /> NA - Not analyzed. <br /> < = Below detection limits used by laboratory. <br /> - = not measured or analyzed <br /> Sample designations: <br /> (34) - Discrete sample depth (feet). <br /> FP - Free product. S - Sheen. O - Obvious product odor. <br /> - Raised MRL due to matrix interference. <br /> Report Date: May 13, 2004 `Page 13 of 14 <br />