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01/20/2000 13:07 7146326744 EAI PAGE 02 <br /> ENVIRONMENTAL AUDIT, INC., 20'h ANNIVERSARY <br /> 1000-A Ortega way <br /> Placentia,CA 92870-7162 <br /> 714/632-8521 <br /> 714/632-6754=FAX 6 mail:Bslolin(i!ertvimr mentalruditinc.cmn <br /> MEMORANDUM <br /> DA'Z'E: January 20, 2000 Project No. 1232 <br /> TO: Michael Infurna <br /> San Joaquin County <br /> Publis Health Services <br /> Environmental Health Division <br /> u <br /> cc: Ed Koberstein,Montgomery Ward <br /> Mark Gilmartin,Esq. <br /> FROM: Boris Stolin <br /> RE: MODIFICATION OF WELLS VEW-2B,VEW-3 AND VEW-4 <br /> Montgomery Ward, Stockton <br /> Environmental Audit, Inc. (EAI) is requesting approval to modify existing wells VEW-2B. <br /> VEW-3,and VEW-4 to increase the efficiency of on-going soil and ground water remediation <br /> efforts at the above referenced site. <br /> These wells were installed in November 1996 and had been converted to in-well sparging <br /> wells by inserting a one-inch diameter sparging tube and connecting to the air sparging <br /> compressor and the vacuum blower of the oxidizer. However,due to extensive carry-over of <br /> ground water into the soil vapor collection header.air sparging air was cut-off and the <br /> have been used for vapor extraction only. <br /> The results of the latest ground water monitoring perfv u_,� - .•u • - u <br /> _.,.w_ntration of dissolved hydrocarbons in monitoring well MW-2,which is located next to <br /> well VEW-2B. On January 13, 2000,EAI obtained two groundwater grab <br /> wells VEW-3 and VEW-9. The analytical data of grab samples show TPH concentrations of <br /> 14.3 mg/L in well VEW-3 and 1.7 mg/L in well VEW-9. <br /> The analytical results indicate that a more aggressive remediation approach should be applied <br /> to reduce the concentration of dissolved hydrocarbon in the vicinity of wells VEW-2B,VEW- <br /> ;, ?-Litead of installing new sparging wells,EAI proposes to modify the existing <br /> wells which have two screens- one in the unsaturated zone and one in <br /> proposed modification will consist of: <br />