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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K.Heran,RE.H.S. Unit Supervisors <br /> w: :< Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> :. <br /> Al Olsen,RE.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: (209)468-3420 <br /> Margaret Lagorio,R.E.H.S. <br /> t�Foa Laurie A.Cotulla,RE.H.S. <br /> Program Manager Fax: (209)464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> JOHN DAVIS MAR 0 7 2003 <br /> MCDOWELL & DAVIS TOWING <br /> 1360 ESCALON AVE <br /> ESCALON CA 95320 <br /> RE: McDowell & Davis Towing SITE CODE: 1486 <br /> 1360 Escalon Ave. <br /> Escalon CA 95320 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed the <br /> December 3, 2002 correspondence submitted on your behalf by M.J. Kloberdanz & <br /> Associates (MJK) and has the following comments. <br /> The correspondence presents a reevaluation of the Risk Based Corrective Action <br /> (RSCA) model that had previously predicted a cancer risk and health hazard to people <br /> working in the building at this site. The reevaluation of the model included using more <br /> appropriate site specific values for the soil porosity and groundwater gradient. The <br /> conclusion of the model remained the same, predicting that the soil contamination <br /> resulting from an unauthorized release of petroleum hydrocarbons at this site presents a <br /> risk via the indoor air quality of the office/shop building onsite. MJK has recommended <br /> that a soil vapor survey be conducted to verify the potential threat to indoor air quality <br /> predicted by the model. <br /> Please submit a work plan to conduct a soil vapor survey to SJC/EHD by April 25, 2003. <br /> If you have any questions or comments call Lori Duncan at(209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> 01 <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James L.L. Barton, CVRWQCB <br /> Mike Kloberdanz, MJK&Associates <br />