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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> v: i Donna K.Heran,R.E.H.S. Carl Bor man,R.E.H.S. <br /> Director East Weber Avenue, Third Floor > <br /> l.l ~: :•.' Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W. Wilson,R.E.H.S. <br /> cRLrFosi`��PProgram Manager Telephone: (209) 468•-3420 Margaret Lagorio, R.E.H.S.Laurie A.Cotulla,,R.E.H.S. <br /> Program Manages. Fax: (209) 464-0138 Robcrt McClellon,R.E.H.S, <br /> Mark Barcellos,R.E.H.S. <br /> JAN THOMPSON `AIN 0 <br /> WILBUR ELLIS COMPANY <br /> P O BOX 1286 <br /> FRESNO CA 93715 <br /> RE: H&H Engineering and Construction Facility SITE CODE: 507797 <br /> 212 Industrial Drive RO: 623 <br /> Stockton, CA 95206 <br /> San Joaquin County Environmental Health Department(EHD) has reviewed one soil and eight <br /> groundwater analytical results for 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB)that <br /> were sent to EHD on December 22, 2004, by Jan Thompson of Wilbur-Ellis Company. Seven of <br /> the eight groundwater samples were analyzed for EDB and results were non-detect for EDB. <br /> Therefore, EHD agrees to the removal of EDB from the analytical list for groundwater analysis. <br /> However, EHD directs you to analyze groundwater samples collected from each proposed borehole <br /> for 1,2-DCA. This decision is based on the positive result of 2.6 micrograms per liter(µg/L) found <br /> in groundwater sample MW-2 collected on December 21, 1999, and the iaiowledge that five of the <br /> eight groundwater samples have detection limits for 1,2-DCA at 5 µg/L, well above the drinking <br /> water maximum contaminant level of 0.5 µg/L adopted by the California Department of Health <br /> Services. <br /> Should you have any questions or concerns regarding this letter, please contact Vicki McCartney, <br /> REHS, by mail (address on letter head), by telephone at (209) 468-3456, or by e-mail at <br /> r <br /> vmccartney@sjcehd.com. <br /> Donna Heran, REHS,Director <br /> Environmental Health Department i <br /> Vicki McCartney, REHS Nuel C. Henderson, Jr., RG <br /> LOP/Site Mitigation Unit 11V LOP/Site Mitigation Unit IV <br /> c: James L.L.Barton -CVRWQCB <br /> Joe Vasquez-Ground Zero <br /> Doug Reynolds—H &H Engineering <br />