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PUBLIC HEALTH SERICES <br /> SAN JOAQUIN COUNTY <br /> r.' <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 °'�;Foaa P <br /> 209/468-3420 (03 <br /> Fly <br /> ED KOBERSTEIN <br /> MONTGOMERY WARD & COMPANY INC <br /> 1331 SO HARBOR BLVD <br /> FULLERTON CA 92632 M&M AUG 0 91996 <br /> RE: Montgomery Wards Auto Center SITE CODE: 2163 <br /> 5400 Pacific Ave. <br /> Stockton, Ca 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) <br /> has reviewed the "Soil Vapor Extraction Pilot Study Work Plan" dated August 5, 1996, <br /> as submitted by Environmental Audit, Inc., and has the following comments. <br /> PHS-EHD appreciates your interest and desire to evaluate a remediation system for <br /> this site. Soil vapor extraction (SVE) has had positive results on sites in this area in the <br /> past. Typically, sites that have had soil contaminants removed by this method have <br /> gone on to show that the potential impact to groundwater in the area has also been <br /> reduced. These sites, for the most part, have conducted SVE where the groundwater <br /> was only threatened or slightly impacted. On sites such as yours, where considerable <br /> groundwater contamination is already known to exist, additional mitigating activities will <br /> need to be addressed. <br /> Since December, 1995, groundwater at this site has risen above the monitoring well <br /> screened interval for MW-1 and MW-2. These two monitoring wells are located in the <br /> areas your current proposal will be targeting. Soil data previously compiled indicates <br /> that soil contamination exists at only shallow depths for the island area (MW-2), but <br /> exists at both shallow depths and at deeper levels at the former underground tank <br /> (UGT) area (MW-1). <br /> High levels of groundwater contamination continue to exist at this site even after the <br /> UGT's have been removed. PHS-EHD has concluded that contaminated soil, still in <br /> place at and below the current groundwater interface, is impacting and degrading the <br /> groundwater. <br /> A Division of San Joaquin County Health Care Services <br />