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RECENED <br /> oCT 3 2006 <br /> ENVIRONMENT HEALTH <br /> P6RMITISERVICES <br /> Executive Summary <br /> f <br /> This site was a former service station and currently is a parking lot adjacent to retail shops. The <br /> underground storage tanks and the gasoline dispensing system were removed in January 1989. Soil j <br /> contaminated with gasoline was discovered at that time. To expedite the cleanup of this site and to <br /> '`-roLect-the roundv-titer,-con-Taminated�soihassocikted�—with=the=form -su ink t� er ens°in <br /> P � `gip g. _ <br /> system was removed, in February 2003. The excavation was backfilled with clean gravel and a <br /> well (MW10) was installed for groundwater monitoring and if necessary removal from the <br /> excavated area. <br /> Pumping from well MWIO showed that a pump rate of 2 gallons per minute can capture the <br /> contaminated groundwater that is associated with this site. An existing groundwater pumping and <br /> water cleaning carbon system will be used to pump the groundwater from MW 10 and clean the <br /> water to the City of Stockton's requirements prior to discharge of the water to the sanitary sewer <br /> using the current sewer discharge permit. The only modification to the system will be the addition <br /> of a sediment control aeration tank prior to pumping into the 91 water carbon unit. This tank will <br /> prevent sediment fouling of the#1 carbon unit, help in the oxidation of the MtBE/TBA <br /> contaminants in the groundwater and allow naturally occurring biodegradation to occur. <br /> It is estimated that the pumping of contaminated groundwater from MW 10 will last 2 years to reach <br /> cleanup goals that will be accepted by San Joaquin County Health. <br /> i <br /> k <br />