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= GEOTHASE <br /> ENVIRONMENTAL <br /> Corrective Action Plan <br /> Cutter Lumber/Western Lift Site <br /> 3930 S. El Dorado <br /> Stockton, California <br /> December 12,2003 <br /> GPE Project No. 102.3 <br /> CWRCB GID Code T0607700498 <br /> .r <br /> 1.0 INTRODUCTION <br /> A gasoline release at the site has impacted the soil and groundwater. The lateral and vertical <br /> extent of the release has been characterized. Long term groundwater monitoring data indicate <br /> that natural attenuation is not adequately mitigating the groundwater plume. This corrective <br /> action plan (CAP) is intended to describe methods and protocols to be used to construct and <br /> operate an engineered remedial system. <br /> 1.1 Current Site Status <br /> Prior work at this site has shown that two separate releases have occurred at widely separated <br /> parts of the Property from two separate former tank settings. The initial remedial <br /> investigation focused upon a release from former tanks located near the south end of the <br /> Property, and this release has been deemed adequately mitigated. During a groundwater <br /> monitoring work associated with this release, unexpected groundwater contamination was also <br /> identified several hundred feet north of the original release site, and subsequent investigation <br /> revealed the existence of another, previously unknown UST release. A former leaking <br /> underground gasoline storage tank impacted the soil and groundwater with gasoline range <br /> petroleum hydrocarbons. The vertical and lateral extent of the gasoline impacted soil and <br /> groundwater has been deemed adequately defined and the available data suggest that the <br /> contaminant plume is stable and has not migrated off of the Property except in a small area to <br /> the west under El Dorado Street. The continued high levels of gasoline and volatile organic <br /> hydrocarbons present in groundwater samples collected from on-site wells, however, suggest <br /> that natural attenuation is not adequately mitigating the groundwater plume. This Corrective <br /> Action Plan is submitted pursuant to the recommendations of our document entitled,Report— <br /> 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br /> w <br />