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ENVIRONMENTAL HEALTH DEPARTMENT <br /> PQM'" SAN JOAQUIN COUNTY <br /> o.•_� .coG Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Bor man,R.E.H.S. <br /> Q. • ` -' 304 East Weber Avenue, Third Floor g <br /> m. Director 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 /> • C`q, �;p • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 <br /> Mark Barcellos,R.E.H.S. <br /> DAVID A ROSSO MAR 13 2003 <br /> CALIFORNIA STATE UNIVERSITY <br /> 401 GOLDEN SHORE, SECOND FLOOR <br /> LONG BEACH CA 90802 4210 <br /> RE: California State University Stanislaus <br /> 1252 N. Stanislaus Street RO 0700 <br /> Stockton, CA 95205 <br /> San Joaquin County Environmental Health Department (EHD) has received two <br /> work plans prepared by Condor Earth Technologies, Inc. (Condor) Problem <br /> Assessment Work Plan (PAWP), dated 23 January 2003, and Work Plan, Soil <br /> and Ground Water Remediation (WPSGWR), dated 03 March 2003, for <br /> investigation and remediation of the above-referenced site. In addition, EHD <br /> personnel met with you on 05 March 2003 at the EHD office to review the status <br /> of your site. The PAWP evaluates three potential remediation technologies and <br /> proposes: <br /> • Installation of five paired direct push borings to depths of 100 feet below <br /> surface grade (bsg) to ascertain soil composition and collect ground water <br /> samples from permeable strata; <br /> • Installation of one at least one deep and one shallow monitoring wells to <br /> verify results of the direct push investigation over time; and <br /> • Specific clean-up goals determined via RBCA modeling. <br /> The evaluated remedial techniques appear to have been superceded by the <br /> WPSGWR, and will not be commented on at this time. EHD approves the <br /> proposed CPT investigation to further delineate the vertical and lateral extent of <br /> impacted soil and ground water. EHD agrees that additional ground water <br /> monitoring wells are needed to characterize and monitor the site and will review <br /> the proposed locations and well designs when the work plan addendum is <br /> received. <br /> EHD does not accept the proposed remediation goals of 74 micrograms per liter <br /> (µg/1) benzene in water or 0.01 milligrams per kilogram (mg/kg) benzene in soil. <br /> The numerical objectives designated in the Central Valley Regional Water <br /> Quality Control Board (RWQCB) basin plan, which are the Maximum <br /> Contaminant Levels (MCLs) are the cleanup levels to be achieved as required by <br />