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Ms Lori Duncan <br /> Page 7 of 7 <br /> • 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 5.1 Conclusions <br /> • The grab groundwater sample collected from hydropunch boring SB1A in January 2001 <br /> contained low levels of several VOCs However, the water sample collected from monitoring <br /> well MW 1 did not contain detectable concentrations of VOCs or oxygenates other than a trace <br /> of chloroform It is generally conceded that monitoring wells provide more representative <br /> samples than do discrete grab samples First groundwater beneath the site does not appear to be <br /> significantly impacted by contaminants from the former UST at the site <br /> • A water sample from the domestic well immediately north of the site and generally <br /> downgradient of the UST release did not contain any detectable concentrations of VOCs or <br /> oxygenate additives Whatever minimal impact has occurred to the shallowest groundwater at <br /> the site has not affected deeper zones <br /> i <br /> i <br /> • All soil with detectable concentrations of contaminants was removed by excavation in <br /> November 2000 No potential threat to groundwater remains at the site <br /> 5.2 Recommendations <br /> Ground Zero recommends that monitoring well MW 1 be properly destroyed and the leaking <br /> underground storage tank case be closed with no further action required <br /> Please contact Ground Zero at your earliest convenience if you have any questions or comments <br /> regarding this report <br /> Respectfully, <br /> Gro nd4ey, <br /> alysis, Inc <br /> ED G'C <br /> Sean G <br /> Staff Geologist GREGORY P. <br /> STAHL <br /> No. 5023 <br /> Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeologist No 264 l'9TF OF CAOE���\P <br /> cc Mr Ed Niemann, North Stockton Auto Service <br /> Mr Marty Hartzell, RWQCB <br /> datalgrounzelnsatitolreponslwellrepon doc, <br />