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0 FILE C�P <br /> ENVIRONMENTAL H <br /> EALTH%EPARTMEN <br /> "' SAN Unit <br /> = G ? Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.x.s. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • cq p Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> [i c 6. d Laurie A.Cotulla,R.E.H.s. Fax: (209) 464-0138 Robert MCClellon,R.E.H.S. <br /> . Program Manager Mark Barcellos,R.E.H.S. <br /> RICHARD POMBO <br /> MEMBER OF CONGRESS <br /> 2495 WEST MARCH LANE, STE 104 JUN 17 2004 <br /> STOCKTON CA 95207 <br /> RE: Gillies Trucking Closure Request <br /> Dear Congressman Pombo, <br /> The San Joaquin County Environmental Health Department (EHD) is in receipt of your <br /> letter of 09 April 2004 regarding the request for closure at 3931 Newton Road, Stockton, <br /> California. Enclosed with your letter was a copy of a 24 March 2004 letter prepared by <br /> Dr. Victor B. Cherven conveying a request for closure. It should be noted that neither the <br /> EHD nor the Central Valley Water Quality Control Board (CVRWQCB) had received the <br /> 24 March 2004 letter. <br /> The EHD has prepared a technical response to this request and has included you on the <br /> circulation list. This letter is to inform you of the key points of the EHD response and <br /> explain why the EHD does not believe that the requirements for closure consideration <br /> have been met. <br /> The Gillies Trucking site is located in an area having several permeable <br /> subsurface sand units that can convey significant quantities of groundwater <br /> and serve as a migration pathway for contaminants. Over 30 groundwater <br /> wells have been identified within 2,000 feet of the site. Most of these wells <br /> are of unknown construction and must be considered potentially vulnerable to <br /> shallow ground water contamination. <br /> The hydrogeological model being developed for this site lacks an adequate <br /> assessment of impacted groundwater, including completion of its lateral and <br /> vertical delineation in all of the affected sand units. This information is <br /> required to be sure that the whole problem has been defined and to provide a <br /> baseline to demonstrate expansion, stabilization, or shrinkage of the problem. <br /> The EHD still needs an estimate of the mass of contaminants stuck to soil <br /> and dissolved into groundwater This information is necessary in order to <br /> assess how big the problem is, how much strength and potential strength it <br /> has, how it can move through the subsurface, and how it may react to <br /> changing conditions, in order to properly evaluate the potential threat to <br /> human health and safety, sensitive receptors and to future groundwater <br /> supplies <br />