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TABLE 1 GROUNDWATER MONITORING DATA Former ARCO Service Station No. 548 ' 1612 Hammer Lane, Stockton, California Well Elevation Static Top Elevation Groundwater Sample of Top Water of of Flow Ethyl- Total Number Date of Casin Level Screen Groundwater Direction TPHG Benzene Toluene benzene Xylenes MTBE I1) Observations VW-5S 12/30/98 NM Well not located Inaccessible because of soil stockpiles 03/31/99 NM NM -- -- Not scheduled for sampling No FP,Yes S,Yes O 06/28/99 NM Dry -- Not scheduled for sampling NM 09/10/99 NM 14.63 -- -- Not scheduled for sampling No FP,No S,No O 12/13/99 NM 14.64 -- -- Not scheduled for sampling No FP,No S,No O 03/28/00 NM 14.56 -- Not scheduled for sampling No FP,No S,No O 06/26/00 NM DRY -- -- Not scheduled for sampling No FP,No S,No O 09/28/00 NM DRY -- -- Not scheduled for sampling No FP,No S,No O 12/18/00 NM 11.48 -- E Not scheduled for sampling No FP,No S,No O 03/14/01 NM 10.44 -- E Not scheduled for sampling No FP,No S,No O 06/19/01 NM 14.23 -- E Not scheduled for sampling No FP,No S,No O VW-51) 12/30/98 NM Well not located Inaccessible because of soil stockpiles 03/31/99 NM 25.65 -- E-SE Not scheduled for sampling No FP,Yes S,Yes O 06/28/99 NM 26.74 -- SE Not scheduled for sampling No FP,No S,No O 09/10/99 NM 29.00 -- E Not scheduled for sampling No FP,No S,No O 12/13/99 NM 28.20 -- E Not scheduled for sampling No FP,No S,No O 03/28/00 NM 24.97 -- SE Not scheduled for sampling No FP,No S,No O 06/26/00 NM 29.81 -- E Not scheduled for sampling No FP,No S,No O 09/28/00 NM 28.31 -- E-NE Not scheduled for sampling No FP,No S,No O 12/18/00 NM -- -- E Not scheduled for sampling Yes FP,Yes S,Yes O 03/14/01 NM 25.00 -- E Not scheduled for sampling Yes FP 06/19/01 NM 24.95 -- E Not scheduled for sampling No FP,No S,Yes O Arco 0548 Quarterly Data.XL.S Delta 9 of 10 1130101