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I <br /> San Joaquin County DIRECTOR <br /> F p40 i N Donna Heran, REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> Stockton , California 95202 -3029 <br /> PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> • p 'p Mike Huggins, REHS, RDI <br /> F p�RWebsite: wwwsjgov.org/end Margaret Lagono, REHS <br /> Phone: (209) 468-3420 RobertMGClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesuo, REHS, RDI <br /> Kasey Foley, REHS <br /> September 5 , 2008 <br /> Gary Stallworth <br /> 602 California Street <br /> Stockton , CA 95202 <br /> Subject : Stallworth Auto Sales Site Code : 2486 <br /> 602 California Street <br /> Stockton, CA 95202 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Additional <br /> Site Assessment Report (Report) dated July 30, 2008, submitted on your behalf by <br /> Advanced GeoEnvironmental, Inc. (AGE) and has the following comments. <br /> The Report documents a site investigation that was completed in two phases during <br /> February and March of 2008 . The first phase included the advancement of three cone <br /> penetrometor test (CPT) borings (CPT-6 through CPT-8), and two soil borings ( B-5 and B-6). <br /> The second phase included the installation of three groundwater monitoring wells (MW-9 <br /> through MW- 11 ). Grab groundwater samples for laboratory analysis were collected from the <br /> CPT and soil borings ; soil samples for laboratory analysis were collected during the <br /> installation of the groundwater monitoring wells. <br /> Analytical results from the grab groundwater samples and from routine quarterly groundwater <br /> monitoring events indicate that the highest concentrations of dissolved contaminants at this <br /> site exist at approximately 70 feet below surface grade (bsg ) . The lateral extent of the <br /> dissolved contaminants at this depth is undefined towards the north and north east. In the <br /> Report AGE recommends additional investigation to define the lateral extent of the <br /> contamination to the north and northeast. The EHD agrees that the lateral extent of the <br /> groundwater contamination at 70 feet bsg must be defined . Please prepare a work plan to <br /> install groundwater monitoring wells at this depth in the down gradient direction . The work <br /> plan is due for submittal to the EHD no later than October 31 , 2008 . <br /> If you have any questions or comments please call Lori Duncan at 468-0337. <br /> Sincerely, <br /> Lori Duncan , REHS Nuel C . Henderson , Jr. , PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Jim Barton , CVRWQCB , 11020 Sun Center Drive Ste . 200, Rancho Cordova CA 95670 <br /> Ally Colavita , AGE, 837 Shaw Road, Stockton CA 95212 <br />