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1• <br /> 1 <br /> GEO-PHASE <br /> ENVIRONMENTAL <br /> i <br /> 1 WORK PLAN <br /> Remedial Action Feasibility Study <br /> ' Cutter Lumber Site <br /> 3930 S. El Dorado <br /> Stockton, California <br /> 1 October 25,2001 <br /> Project No. 102.3 <br /> . 1.0 INTRODUCTION <br /> 1 Prior work at this site has shown that two separate releases have occurred at widely <br /> separated parts of the Property from two separate former tank settings. The initial <br /> ' remedial investigation focused upon a release from former tanks located near the south <br /> end of the Property. This release has been deemed adequately mitigated. During <br /> groundwater monitoring work associated with this release, unexpected groundwater <br /> contamination was also identified several hundred feet north of the original release. <br /> Subsequent investigation revealed the existence of another, previously unknown UST <br /> release. Field work and groundwater monitoring completed at the site since 1997 show <br /> ' that a former leaking underground gasoline storage tank impacted the soil and <br /> groundwater with gasoline range petroleum hydrocarbons. To date, the remedial <br /> ' investigation work has consisted of groundwater monitoring. The vertical and lateral <br /> extent of the gasoline impacted soil and groundwater has been deemed adequately defined <br /> and the available data suggest that the contaminant plume is stable and has not migrated <br /> ' off of the Property except in a small area to the west under El Dorado Street. The <br /> continued high levels of gasoline and volatile organic hydrocarbons present in <br /> groundwater samples collected from on-site wells, however, suggest that natural <br /> 1 attenuation is not adequately mitigating the groundwater plume. This Work Plan is <br /> submitted to propose methods and protocols to conduct work, which will investigate the <br /> feasibility of several options designed to remove petroleum hydrocarbons from the <br /> �. subsurface. <br /> ' 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br />