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PPR-22-1597 16:53 FROM -GE©LOG I CAL TECHNICS TO <br /> 4640138 P.02 <br /> Ge0k0C4Z(Te,chnics2nc- <br /> Z741J&trXF3d <br /> Male"'Cafwx*95351 <br /> Mr) Asx <br /> April 21, 1997 <br /> Project No.: 251.3 <br /> Project Name: Farmer Moresco Property(Gawne Rd) <br /> Mr.Ron Rowe <br /> San Joaquin County]public Health Scrvices <br /> Environmental Health Division <br /> 3041? Weber Ave.Third Floor <br /> P.O.Box 388 <br /> Stockton,CA 95201-0388 <br /> RF_- Addendum to interim Remedial Action Plan-4/8197 <br /> Former Moramo Property, 16865 Gawne Road, Stockton,CA <br /> Dm?&.Rowe: <br /> on behalf of Michael D_ McGranahan,,Trustee,we have prepared this Addendum to Geological <br /> Technics Inc. April 8, 1997 Interim Remedial Action Plan, for the Former Moresco Property, <br /> 16965 Gawne Road, Stockton,California. This addendum addmsscs the oor=ns you expmessecl <br /> in your fax dated April 11, 1997 with regards to sail remediation by vapor extraction. <br /> 1.0 Pere Volumes and Pore Volume Exchange Rates <br /> fore Volume <br /> We estimated pore volume in the ares around the proposed vapor exhwdon wetl at 50,893 f. <br /> Volume=(g)(r)(b)(n) <br /> • r(radius)=30 feet,distance from the extraction well to the farthest recharge well. <br /> • b(thickness)=45 feet. <br /> • n(Porosity)=40%,rangcd from.36 to 49%. <br /> Pore Volume Expb4ogelteft <br /> The ThemW Oxidizer (TQ) is equipped with a blower rated of 250 SUM which is the <br /> equivalent of 360,000 cubic feet per day. This volume is 7 times greater then the requested <br /> exchange rate of 1rm volume per day. However, past experience with vapor extraction <br /> sys-terns equipped with TO units has shown that typically for the first several weeks it is not <br /> possible to run the system at 100% extraction from the subsurface because of the anoxic <br /> conditions in the subsurface. The system mast first be.run at partial extraction until: <br /> 1. Enough oxygen is added to the subsurface through the passive recharge wells to allow <br /> for a complete burrs in.the TO. <br /> 2. The extzemely high concentrations of gasoline vapor have been removed to allow the <br /> TO to he run at full capacity with out over heating. <br />