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i <br /> I <br /> Closure Report 8 <br /> Golden Grain Manteca Bean Faeflhty,299 Moffat Boulevard,Manteca,California July 15,1996 <br /> ' <br /> 30 SITE REMEDIATION <br /> This section summarizes the remediation activities of the site The following subsections 31, 32, <br /> and 3 3 present the feasibility evaluation,treatment system selection, design and implementation, <br /> and the remediation system effectiveness, respectively <br /> ' 3.1 Feasibility Evaluation <br /> ' On December 21, 1989, a Problem Assessment Report (PAR)was submitted to SJCPHS and to the <br /> RWQCB (Groundwater Technology 1989) In addition to presenting the results of the assessment <br /> work completed at the site,the PAR also included a feasibility evaluation for remedial action at the <br /> site Possible Best Available Technologies were identified and were evaluated for technical and <br /> economic feasibility as treatment options for the site Specifically,the following options were <br /> ' reviewed <br /> ■ no action <br /> ■ physical containment <br /> ■ soil excavation <br /> ■ vapor extraction and treatment <br /> ' ■ groundwater extraction and treatment <br /> ■ bioremediation (in situ) <br /> ' The feasibility evaluation resulted in a recommendation to Implement soil vapor and groundwater <br /> extraction and treatment systems These two alternatives were chosen based on the capacity to <br /> control plume migration and actively remove hydrocarbons from the subsurface Limiting factors <br /> affecting the technology selection were contaminant distribution, space available at the site, and <br /> cost/benefit factors <br /> Following the submittal of the PAR, additional site baseline data for remediation were collected <br /> ' These data were collected through the completion of a soil vapor extraction pilot test and a <br /> groundwater pumping test The results of the soil vapor extraction pilot test were presented in the <br /> Final Remedial Plan dated September 17, 1990 (Groundwater Technology 1990b) The result of the <br /> ' groundwater extraction pumping test was presented in the Addendum to Final Remedial Plan dated <br /> February 6. 1991 (Groundwater Technology 1991) <br /> [20213 GR <br /> FLUOR DANIEL GTI <br />