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f <br /> i <br /> Tosco 76 Branded Facility No. 11195,Lathrop,California Page 2 <br /> I <br /> Groundwater Gradient? Southeast to southwest at an average gradient of 0.001 fUft <br /> F] issolvedlfree product remediation in progress? Yes EE <br /> i3nticipated start? February 1999 E <br /> anticipated completion? unknown <br /> Amount of gw contaminant recovered this quarter? 60,500 (gal) <br /> Amount of gw contaminant recovered historically? 411,260 (gal) <br /> CONCLUSIONS: <br /> The vertical and lateral extent of soil impact is defined. Additional subsurface investigation in the vicinity of well <br /> MW-10 is warranted. The impacted groundwater beneath the site is not defined but is currently being remediated <br /> by weekly groundwater purging. The purged groundwater is being transported to the Tosco Refinery in Rodeo, <br /> California for disposal. <br /> RECOMMENDATIONS: <br /> GR will submit a Work Plan to further access the groundwater conditions downgradient of well MW-10. GR <br /> recommends that well MW-10 be added to the groundwater purging schedule. <br /> CONSULTANT: Gettler- Ryan Inc. <br /> 140193.01111 195gsr.q f <br />