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1 <br /> 1 <br /> GEO-PHASE <br /> ENVIRONMENTAL <br /> 1 <br /> Corrective Action Plan <br />' Former Manna Pro Site <br /> 4004 S. El Dorado <br /> Stockton, California <br />' 1~ebruary 16,2001 <br /> Project No 207 3 <br /> 1.0 INTRODUCTION <br />' Field work and groundwater monitoring completed at the site since 1990 show that <br /> former leaking underground storage tanks impacted the soil and groundwater with a <br /> • substantial volume of gasoline range and a small volume of diesel range petroleum <br /> hydrocarbons Engineered remedial work to date has consisted of excavation and <br /> removal of impacted soil Over the past several years, groundwater monitoring data has <br />' been collected from 11 groundwater monitoring, 2 extraction, and 5 observation wells <br /> situated through, and around, the contaminant plume The available data suggest that the <br /> contaminant plume is stable and has not migrated off of the Property except in a small <br />' area to the west under E1 Dorado Street <br /> The San Joaquin county PHS-EHD has deemed the lateral and vertical extent of the <br />' plume to be adequately characterized The continued high levels of gasoline and volatile <br /> organic hydrocarbons in groundwater samples collected from several on-site wells, <br /> however, suggest that natural attenuation is not adequately mitigating the groundwater <br />' plume Manna Pro recently completed a second round of feasibility testing and submitted <br /> a Feasibility Study This study concluded that vapor extraction in conjunction with air <br /> sparging is the remedial method most likely to adequately mitigate this release in a timely <br />' and cost efficient manner Pursuant to a directive dated November 20, 2000, this Work <br /> Plan is submitted to describe the methods and protocols to be used in the completion of <br />' the approved corrective action technology <br /> I <br /> i <br /> 2937 Veneman Ave, #13240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209) 569-0295 <br /> I <br />