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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 Elevation Static Top Elevation Groundwater <br /> Sample of Top Water of of Flow Ethyl- Total <br /> Number Date of Casing Level Screen Groundwater Direction TPHg Benzene Toluene benzene Xylenes MtBE[1] Observations <br /> VW-5S 6/17/2002 [NP] NM 13.07 -- E 190[3] <0.50 <0.50 <0.50 6.3 4.53[2] No FP,No S,No O <br /> (cont.) 9/9/2002 NP NM 12,73 -- NE <50 <0.5 <0.5 <0.5 <0.5 <0.5 No FP,No S,No O <br /> VW-51) 12/30/1998 NM Well not located Inaccessible because of soil stockpiles <br /> 3/31/1999 NM 25.65 &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 29.8I -- 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 O <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 far 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[2][5] 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 PP,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 /> Analytical results in micrograms per liter. P=Purge. <br /> TPHg-Total petroleum hydrocarbons as gasoline. NP=No purge. <br /> MtBE-Methyl tent-butyl ether. <-Below detection limits used by laboratory. <br /> Elevation datum is mean sea level. <br /> Measurements infect. Sample designations; <br /> NA-Not analyzed. MW-4(34)-Well ID and sample depth(feet). <br /> NM-Not measured. FP-Free product. <br /> NE-Not evaluated. S- Sheen <br /> #•Bailer blank. O-Obvious product odor. <br /> *-Raised MRL due to matrix interference. <br /> **-The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline;the chromatogram does not match the typical gasoline fingerprint. <br /> ***-Raised MRL due to high analyte concentration requiring sample dilution <br /> [l]MTBE was analyzed using USEPA Method 8020. <br /> [2]MTBE was analyzed using USEPA Method 8260. <br /> 0546 QMR3Q02 <br /> 9 of 10 <br />