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• ; . t;Atjtiiii Luui�'i Y <br /> ENVIROENTAL HEALTH DIVISION <br /> 304 E. Weber Ave.Third Floor <br /> P.O.Sox 388, Stockton,CA 95201 388 <br /> Phone: (209)468-34M <br /> /""`( Approved <br /> Approved with Chanpe : See RvWk <br /> Post-It*Fax Note 7671 Date 1-2.!5pa°yeaF i DisapprOved: See RON*e <br /> To 0 From Rema*s <br /> Co./Dept. Co. <br /> Phone# Phone# <br /> Fax# / Fax# Date I-Z5-ZCX:>0 t3y <br /> 1 (V <br /> - Approval of these plans extends my to that <br /> wluch is shown and described arson but <br /> does not authorize or approve a omission <br /> or4eviation of requirements of $ e laws or <br /> Lol4ENVIRONMENTAL AUDIT,INC.. jaOr 'naR ARY <br /> 1000-A Ortega Way <br /> Placentia,CA 92870-7162 <br /> 714/632-8521 <br /> 714/632-6754=FAX E-mail:b<tnlin a enc irnnmemalauditinc.eain <br /> MEMORANDUM <br /> DATE: January 20,2000 Project No. 1232 <br /> TO: Michaellnfuma <br /> San Joaquin County <br /> Publis Health Services <br /> Environmental Health Division <br /> cc: Ed Koberstein,Montgomery Ward <br /> Mark Gilmartin,Esq. <br /> FROM: Boris Stolin <br /> RE: MODIFICATION OF WELLS VEW-28,VEW-3 AND VEW-4 <br /> Montgomery Ward,Stockton <br /> Environmental Audit,Inc.(EAI)is requesting approval to modify existing wells VEW-213, <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 wells <br /> have been used for vapor extraction only. <br /> The results of the latest ground water monitoring performed in December 1999 showed a high <br /> concentration of dissolved hydrocarbons in monitoring well MW-2,which is located next to <br /> well VEW-213. On January 13,2000,EAI obtained two ground water grab samples from <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-213,VEW- <br /> 3,and VEW-4. Instead 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 the saturated zone. The <br /> proposed modification will consist of: <br />