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' Report—Fist Phase Remedial System Page 21 <br /> Former Manna Pro Site <br />' Project No 207 3 <br /> . June 18, 2002 <br />' 7.2 Recommendations <br /> Based on the above conclusion, Geo-Phase Environmental Inc recommends the <br /> following <br />' I The remedial system should be expanded as anticipated in the CAP, subject to several <br /> modifications <br />' 2 As mentioned above the extracted soil vapor is much too lean to operate a thermal <br /> oxidizer without the infusion of propane fuel If the system is expanded to operate <br />' four or more extraction wells simultaneously, between 600 and 1,000 scfm of <br /> formation vapor will have to be treated This would require huge amounts of <br /> propane, and at costs of up to $2 per gallon, the costs would be unacceptably high <br />' We estimate that if a thermal oxidizer had been used for this first phase of the Project, <br /> the cost of propane alone would have totaled about $15,000 to $20,000 We therefore <br /> recommend that carbon filtration be retained to treat the extracted gasoline A <br />' preliminary cost analysis suggests that a 12,000-pound carbon filter would be the <br /> most cost-effective method of proceeding Given the decline rate of gasoline <br /> experienced so far, this large canister would be used for a period of a few months, and <br /> then possibly replace with smaller unit(s) <br /> 3 An addendum to the CAP will be prepared and submitted the San Joaquin County <br /> PHS-EHD for approval A detailed budget of the costs will be submitted to the <br /> California UST Clean-up Fund for pr-approval of the associated costs <br /> 2937 Veneman Ave ,#13240 Geo-Phase Environmental Inc Phone(209) 569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />