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Tab* <br /> Groundwater Monitoring Data <br /> 1995 to Present <br /> ARCO Service Station No 548, 1612 Hammer Lane, Stockton, California <br /> Well Elwation Static Top Elevation Groundwater <br /> Samph, of Top Water of of flow Ethyl- Total <br /> Number Date of Casing Level Scrcen Groundwater Direction TPHG Benzene Tolutne benzene X lenus MTBE [11 Observations <br /> VW-513 12/30/98 NM Well not located Inaccessible because of soil stockpiles <br /> VW-513 03/31/99 NM 2565 -- E-SE Not scheduled for sampling No FP, Yes S,Yes O <br /> VW-5D 06/28/99 NM 2674 - SE Not scheduled for sampling No FP,No S,O=NE <br /> VW-5D 09/10/99 NM 2900 -- E Not schedult d for sampling No 17P,No S,O=NE <br /> VW-5D 12/13/99 NM 2820 L Not scheduled for sampling No FP,No S,O=NE <br /> VW-5D 03/28/00 NM 2497 SE Not scheduled for sampling No FP,No S,O=NE <br /> VW-5D 06/26/00 NM 2981 E Not scheduled for sampling No FP,No S,O=NE <br /> Analytic d results in parts pet billion P=Purge <br /> PHG-Total petroleum hydrocai bons as gasoline NP=No purge <br /> TBE-Methyl-tent butylether <-Below detection limits used by laboratory <br /> levation datum is mean sea level f I]MTBE was analyzed using USEPA Method 8020 <br /> easurements in feet [2]MTBE w-is analyzed using USFPA Method 8260 <br /> A-Not analyzed Sample designations <br /> Not measured MW 4(34)-Well ID and sample depth(feet) <br /> Not evaluated <br /> *-Raised MRL due to matrix interference <br /> ** The simple contains a]ower boihng point hydrocarbon mixture quantified as gasoline,the cluomatogrim does not match the typiLdl gdsolme fingetprmt <br /> ***-Raised MRL due to high analyte concentration requiring sample dilution <br /> N-Bailer blank <br /> P-Free pioduct <br /> S- Sheen <br /> Obvious product odor <br /> C 1ARC0105481QTRLY10548y200 x1s Delta <br /> Page 9 of 9 9/20100 <br />