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ENVIRONMENTAL AUDIT, INC.CFO <br /> t - <br /> �L 1000-A ORTEGA WAY • PLACENTIA, CA7 ' �;I <br /> 7141632-8521 FAX. 714/6W16MMENTAL=HEALTH DIVIS#DN,_- <br /> 304 E Wd*Mb -'third Floor= <br /> P.4 Box 388, Stockton,CA 95201 <br /> Phone (209)468-3420 r� - <br /> pproved <br /> Ci,,wroved'with changes jg"Terlm 99 <br /> Disapproved See Remarks <br /> Rem%r<i{SP_rninat Nn J?1? <br /> Michael Infurna ---µ-�--- <br /> San Joaquin County Public Health Services DateY <br /> Environmental Health Division Approval rt hese plan- extonds on(v to th nt ' <br /> P O Box 2009 which it ahown and�deccrtbl_)d' her nn v, <br /> 1601 East Hazelton Avenue does, noz,a t)lflonz€' or ;y ,iv r nv n <br /> Stockton, California 95201-6229 oP )I r9lquilal, 13rlt5 of stare ic"as "r <br /> L ac .-x. ,jinar?+;' <br /> RE: PROPOSED MODIFICATIONS TO APPROVED CAP <br /> Montgomery Ward Auto Service Center <br /> 5400 Pacific Avenue, Stockton, CA <br /> Site Code 2163 <br /> i <br /> • Dear Mr Infuina <br /> On July 6, 1998, Environmental Audit, Inc (EAI) submitted to the San Joaquin County <br /> Public Health Services, Environmental Health Division (County), on behalf of <br /> Montgomery Ward, a Corrective Action Plan (CAP) to remediate impacted soil and ground <br /> water associated with the above-referenced site On August 12, 1998, the County <br /> approved the CAP In December 1998, the State of California UST Cleanup Fund pre- <br /> approved costs associated with implementing the County approVLd CAP <br /> Based on data available from the December 1998 ground water sampling and testing event, <br /> and EAI s recent experience at other sites with maintenance of deep air sparging wells <br /> containing a packer, EAI is proposing to modify the design of selected air sparging and <br /> vapor extraction wells and to perform air sparging at three additional site wells These <br /> changes are not significant and are intended to increase the effectiveness and efficiency of <br /> the remedial system <br /> 10 MODIFICATION OF AIR SPARGING/VAPOR EXTRACTION WELLS <br /> (Wells VEW-6A/B through VEW-13A/B) <br /> EAI proposes to install a separate air sparging well and vapor extraction well in one boring <br /> (see Figure 1 attached hereto) instead of using one deep well screcned in two locations <br /> • with a packet between them and a separate shallow vapor extraction well (as described on <br /> PLANNING,ENVIRONMENTAL,ANALYSES AND <br /> HAZARDOUS SUBSTANCES MANAGEMENT AND REMEDIATION <br />