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ENVIRONIRENTAL HEALTH REPARTMENT <br /> 'OPQUIN CO <br /> SAN JOAQUIN COUNTY <br /> a: 'Za Donna K. Heran, R.E.H.S. Program Coordinators <br /> 0' ` ` Director 304 East Weber Avenue,Third Floor Carl Borgman, R.E.H.S. <br /> - _- Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S.,R.D.I. <br /> c`4•. �°' Assistant Director Margaret Lagorio, R.E.H.S. <br /> tiFiiai+ Telephone: (209)468-3420 Robert McClellon,R.B.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco,R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> STEPHANIE FURGAL LIAR Q 2007 <br /> CHEVRON ENVIRONMENTAL MANAGEMENT COMPANY <br /> 6001 BOLLINGER CANYON RD ROOM K2050 <br /> SAN RAMON CA 94583 <br /> RE: Former Unocal #0187 <br /> 437 E. Miner Street <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the "Quarterly <br /> Groundwater Monitoring and Ozone Microsparge System Status Report, Fourth Quarter 2006" <br /> dated February 7, 2007, prepared by ENSR for the above referenced site. <br /> ENSR recommended in the quarterly report that analysis for EDB be discontinued since it had <br /> not been detected in groundwater samples over three quarterly sampling events. EHD concurs <br /> with this recommendation. In addition, please note that in a letter dated April 10, 2006, EHD <br /> had concurred with ENSR's recommendation in the January 2006 Site Conceptual Model that <br /> MTBE and MTBE metabolites be discontinued from analysis. <br /> ENSR stated in the February 2007 quarterly report that a Site Assessment Report on the soil <br /> gas assessment, aquifer testing and CPT investigation performed in 2006 was being prepared <br /> but did not state when the report would be submitted. This report should be submitted to EHD <br /> through GeoTracker by May 1, 2007. <br /> If you have any questions contact me at (209) 468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Margaret Lagorio, REHS <br /> Program Coordinator Unit IV <br /> c: Jim Barton — CVRWQCB <br /> David Irey— SJCADA <br /> George Forsythe - ENSR <br />