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SRN JOACtUIN COUNTY <br /> ENYIRS NNf AL WAI.?H DIVISION <br /> 304 E wdwAve.Thwd Floor <br /> P.O.ft Pftone�� %201-0388 <br /> t - <br /> D <br /> Approved with Charges: See Rel &ft <br /> ❑Disapproved: see Remarks ENVIRONMENTAL AUDIT, INC. _ <br /> R9rila 1000-A ORTEGA WAY • PLACENTIA,CA 92870-7162 •; <br /> 714/632-8521 • FAX 714/632-6754 <br /> N <br /> Date By <br /> Approval of these plans exten s only to thattlamomy <br /> 26,1999 <br /> which is shown and described hereon but Pm;xtt No. 1232 <br /> does not authorize or approve any omission <br /> or deviation of requirements of State laws or Michael InHuna <br /> Local Ordinances- San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O.Box 2009 <br /> 1601 East Hazelton Avenue <br /> Stockton,California 952015229 <br /> RE: PROPOSED MODIFICATIONS TO APPROVED CAP <br /> Montgomery Ward Auto Service Center <br /> 5400 Pacific Avenue,Stockton,CA <br /> Site Code 2163 <br /> Dear Mr.Infimra: <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 Food pre. <br /> approved costs associated with implementing the County approved 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 /> 1.0 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 extinction weBbt one boring <br /> (see Figure l attached hereto) instead of using one deep well screened in locations <br /> with a packer between them and a separate shallow vapor ranaction well(as�dcscribed on <br /> PLWMWG,ENYIRONMENTALANALYSES AND <br /> HAZARDOUS SUBSTANCES MANAGEMENT AND REMEDIATION <br />