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San Joaquin County . DIRECTOR <br /> Donna Heran,REHS <br /> oPo Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie cotuua, REHS <br /> N { Stockton, California 95202-3029 <br /> �. PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> i! Mike Huggins,REHS,RDI <br /> c��iFo`R �P Website: www.SJgov.org/ehd Margaret Lagorio, REHS <br /> Phone: ,(209)468-3420 Robert McClellon, REHS <br /> Fax: (209)464-0138 .teff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> Paul Verma FEB 0 5 2008 <br /> City of Tracy <br /> 520 Tracy Boulevard <br /> Tracy CA 95376 <br /> Subject: Wastewater Treatment Plant Site Code: 2330 <br /> 3900 Holly Drive <br /> Tracy CA 95376 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Limited <br /> Phase I/ Investigation (Work Plan) dated December 10, 2007, submitted on your behalf by <br /> Wright Environmental Services, Inc. (Wright) and has the following comments. <br /> In 1998 one underground.storage tank (UST) was removed from the above referenced site. <br /> In 2003 four exploratory borings were advanced around the former UST area. Soil samples <br /> collected from the borings were reported 'non-detect' for petroleum hydrocarbon <br /> constituents, but four grab groundwater samples reported total petroleum hydrocarbons as <br /> diesel. -The purpose of this Work Plan is to confirm and/or show declining trends in the <br /> reported groundwater contaminant con <br /> p g centrations. . <br /> Wright proposes to perform a sensitive receptor. survey to id all wells and potential <br /> P Y Y <br /> receptors located within a 2000-foot radius of the former UST area. Wright further proposes <br /> to install five Geoprobe soil borings, to maximum depth of approximately 25 feet below <br /> surface grade,'to collect additional soil and grab groundwater samples for analysis. <br /> The EHD approves the proposed scope of work with thecondition that analyses for <br /> 1,2-dichloroethane and ethylene dibromide are added to the analytical suite. If you have any <br /> questions please call Lori Duncan at (209),468-0337. <br /> Sincerely, <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., PG <br /> Registered Environmental Health Specialist Engineering Geologist <br /> cc: James Barton, CVRWQCB, 11020 Sun Center Drive, #200, Rancho Cordova CA 95670 <br /> John Lynch, Wright Environmental, 2395'East Pescadero Avenue, Tracy CA 95304 <br />