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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> �� ° " Environmental Health Department <br /> �c0 M ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> 1 liSd1�= <br /> Carl Borgman, REHS <br /> Mike Huggins, REHS,RDI <br /> F o ac'�P Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon, REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> Andrew Eggiman 'JUL 0 3 2008 <br /> c/o Robert Eggiman <br /> PO Box 580 <br /> Mountain Ranch, CA 95246 <br /> Subject: Eggiman's Hydraulic Site Code: 1914 <br /> 1112 East Harding Way <br /> Stockton, CA 95205 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Monitoring <br /> Report Second Quarter, 2008 (Report) dated June 5, 2008, and the Site Conceptual <br /> Model (SCM) dated March 6, 2008, both submitted on your behalf by ATC Associates, <br /> Inc. (ATC) and has the following comments. <br /> The SCM provides ATC's overall assessment of the site features and condition. ATC <br /> estimates that 5.16 pounds of total petroleum hydrocarbons as gasoline (TPHg) remain in <br /> the groundwater, and 5,131.73 pounds of TPHg remain in the soil at your site. <br /> Results of routine quarterly groundwater monitoring and sampling indicate that there is <br /> mostly adequate definition of the lateral extent of most contaminants of concern, the <br /> exceptions being TPHg and TPH as diesel (TPHd) which are not defined to the west. All <br /> monitoring wells located onsite, and MW-9 located offsite to the west, also have reported <br /> concentrations of 1,2-DCA. <br /> Please proceed with preparation and submittal of a feasibility study comparing at least two <br /> different methods for remediation ' of the petroleum hydrocarbon and 1,2-DCA <br /> contamination, in both soil and groundwater, at your site. The Feasibility Study is due for <br /> submittal to the EHD no later than September 1'2, 2008. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> Lori Duncan, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental .Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive #200, Rancho Cordova, CA 95670 <br /> Jeanne Homsey, ATC, 1117 Lone Palm Ave, Suite B, Modesto, CA 95351 <br />