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p <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> P° Ully <br /> SAN JOAQUIN COUNTY <br /> e a� Donna K. Heran, R.E.H.S. Program Coordinators <br /> N 304 East Weber Avenue, Third Floor Cart Bergman, R.E.H. S . <br /> Director g <br /> Laurie A. Cotulla, R.E.H.S. Stockton, California 95202-2708 Mike Huggins, R.E.H.S , R.D.I. <br /> r . -.. e Mar aret La orio, R.E.H. S . <br /> 9c FoaN <br /> Assistant Director Telephone: (209) 468-3420 g g <br /> Robert o <br /> Fax: (209) 464-0138 Jeff Carrueseo, Rs <br /> R.E.H.S . <br /> Website: www.sjgov.org/ehd/ Kasey Foley, x.KH.S. <br /> OCT 12 2006 <br /> GARY STALLWORTH LEWIS STALLWORTH <br /> 602 CALIFORNIA STREET 1107 BURKETTE AVE <br /> STOCKTON CA 95202 STOCKTON CA 95205 <br /> RE : Stallworth Auto Sales SITE CODE : 2486 <br /> 602 California Street <br /> Stockton CA 95202 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Quarterly Report <br /> . 2nd Quarter 2006 (Report) dated September 21 , 2006 submitted on your behalf by Advanced <br /> GeoEnvironmental , Inc. (AGE) and has the following comments . <br /> The Report documents a routine quarterly groundwater monitoring and sampling event conducted <br /> at your site on June 9, 2006 . In the Report AGE recommends preparation of a work plan for <br /> interim remediation of the groundwater plume. <br /> The California Code of Regulations requires that prior to selection and implementation of a cleanup <br /> technology at a contaminated underground storage tank (UST) site, a feasibility study must be <br /> prepared to determine which cleanup technology will work most effectively at the site in question . <br /> The UST's at Stallworth Auto Sales were removed in May 1991 ; investigation of the site did not <br /> begin until February 2000 . The window of opportunity for effective control of the migration of the <br /> groundwater contaminant plume is likely closed . Monitoring wells MW-1 C and MW-1 D were <br /> installed in the source area to total depths of 135 and 150 feet below surface grade (bsg) <br /> respectively. Analytical results from the sampling of these wells have been reported for three <br /> quarters and the concentrations of contaminants have decreased with each sampling event, <br /> indicating the contamination may be an artifact of the well installations and not a true indication of <br /> the groundwater condition at depth . Continued evaluation of the vertical extent of the groundwater <br /> contamination will be made with each reported quarterly sampling event. <br /> SJC/EHD agrees that it would be appropriate at this time to consider site remediation , but interim <br /> remediation is not warranted . A feasibility study must be prepared and followed, if needed, by <br /> feasibility testing and preparation of a Corrective Action Plan (CAP). The feasibility study and/or <br /> work plan for feasibility testing are due for submittal to SJC/EHD no later than December 22, 2006. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Donna Heran , REHS, Director <br /> Environmental Health Department <br /> t-cn1 lr.� . �O <br /> Lori Duncan, Senior REHS Nuel C. Henderson , Jr. , PG — <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc; James Barton, PG, CVRWQCB <br /> Eyrene Fisher, AGE <br />