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TE*o . 4 9 , 91 15 : 03 No . J11 F . 02 <br /> h <br /> FACILITY: Defense Distribution Region West, Sharpe Site <br /> LOCATION: Lathrop <br /> CONSULTANT: U. S. Army Toxic and Hazardous Materials Agency (USATHAMA) <br /> Environmental Science and Engineering (ESE) <br /> PROPOSAL DATE: Vapor Extraction Pilot Study Work Plan <br /> 28 Jurie 1991 <br /> Monitoring Well(s) (Vapor) <br /> Soil Boring(s) <br /> i' Soil Excavation S <br /> — ( ) DepthVery shallow (approx. 3-4 ft. for double <br /> X 8Vapor extraction wells ringed infiltrom ter tests) <br /> We have reviewed the above proposal concerning the above check items and the <br /> Proposal is acceptable. <br /> Date: Staff Signature: Geiy <br /> The proposal has been discussed with USATHAMA, A detailed review of the Vapor <br /> Extraction Work Plan will follow under a separate cover letter. <br /> Five feet of bentonite pellets in the au <br /> lus 's unacceptable. The bentonite <br /> must be hydrated prior to placement in . annulus or clean, contaminant free <br /> water must be added to the pellets of placement in the annulus. Five feet <br /> of bentonite is unnecessary and shoul be reduced to two or three feet, if <br /> bentonite pellets are to be used. <br /> Twenty soil borings are not approved as these were not discussed in the Work <br /> Plan. Specifics on the purpose and locations of the borings were not discusse . <br /> , <br />