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TABLE 1 <br /> GROUNDWATER ELEVATION AND ANALYTICAL DATA <br /> ARCO Service Station No. 548 <br /> 1612 Hammer Lane, Stockton, California <br /> Well Top of Static Top Groundwater Ethyl- Total <br /> Sample Sample Casing Water of Groundwater Flow TPHg Benzene Toluene benzene Xylenes MtBE[1] <br /> Number Date Elevation Level Screen Elevation Direction mqj mg1L m m mg1L m Observations <br /> VW-5D 12/30/1998 NM Well not located Inaccessible because of soil stockpiles <br /> 3/31/1999 NM 25.65 -- E-SE Not scheduled for sampling No FP, Yes S, Yes O <br /> 6/28/1999 NM 26.74 -- SE Not scheduled for sampling No FP, No S, No O <br /> 9/10/1999 NM 29.00 -- E Not scheduled for sampling No FP, No S, No O <br /> 12/13/1999 NM 28.20 -- E Not scheduled for sampling No FP, No S, No O <br /> 3/28/2000 NM 24.97 -- SE Not scheduled for sampling No FP, No S, No O <br /> 6/26/2000 NM 29.81 -- E Not scheduled for sampling No FP, No S, No O <br /> 9/28/2000 NM 28.31 -- E-NE Not scheduled for sampling No FP, No S, No O <br /> 12/18/2000 NM -- -- E Not scheduled for sampling Yes FP, Yes S, Yes C <br /> 3/14/2001 NM 25.00 -- E Not scheduled for sampling Yes FP <br /> 6/19/2001 NM 24.95 -- E Not scheduled for sampling No FP, No S, Yes O <br /> 9/11/2001 NM 28.00 -- E Not scheduled for sampling No FP, No S, Yes O <br /> 12/13/2001 [NP] NM 28.42 -- E-NE 54,000 840 2,300 1,100 17,000 67[2] No FP, No S, No O <br /> 3/12/2002 ]NP] NM 25.65 - E 1,400[3] <5.0 8.0 <5.0 96 <2.5[21[51 No FP, No S, No O <br /> 6/17/2002 [NP] NM 27.67 -- E 3,300 12 40.0 36 1,200 <2.5[2] No FP, No S, No O <br /> 9/9/2002 NP NM 29.39 -- NE 3,100 <5 <5 <5 870 <5 No FP, No S, No O <br /> 12/4/2002 NP NM 29.65 - NE 3,200 <100 <100 220 3200 <100 No FP, No S, No O <br /> 3/3/2003 NP NM 27.48 SE 1,400 7.0 11 23 480 <5.0 No FP, No S, No O <br /> 6/3/2003 NP NM 27.28 650 7.2 2.6 J 1.5 210 <1.0[2] No FP, No S, No O <br /> Analytical results in micrograms per liter. P=Purge. <br /> TPHg-Total petroleum hydrocarbons as gasoline. NP=No purge. <br /> MtBE-Methyl tort-butyl ether. <-Below detection limits used by laboratory. <br /> Elevation datum is mean sea level. mg/L=micrograms per Liter <br /> Measurements in feet. <br /> NA-Not analyzed. Sample designations: <br /> NM-Not measured. MW-4(34)-Well ID and sample depth(feet). <br /> NE-Not evaluated. FP-Free product. <br /> #-Bailer blank. S- Sheen. <br /> O-Obvious product odor. <br /> K:1Wprocess\J5 BP ARCO\005481Quarterly10548 QMR 2Q03 <br /> 10 of 11 <br />