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ENVIRONMENTAL HEALTIDEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> i , 304 East Weber Avenue, Third Floor <br /> a: 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 /> �.,. P. Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> '°cIFBAd Laurie A.Cotulla,R.E.H.S. Robert McClellon,R_E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> JAN 12 2005 <br /> SHELBY LATHROP <br /> CONOCO PHILLIPS COPY <br /> RISK MANAGEMENT & REMEDIATION <br /> 76 BROADWAY <br /> SACRAMENTO CA 95818 <br /> RE: TOSCO/UNOCAL SITE CODE: 1217123 <br /> 4707 Pacific Avenue <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the <br /> "Quarterly Summary Report - Third Quarter 2004" dated October 19, 2004, <br /> prepared by Secor International Inc. for the above referenced site. The report <br /> requests that the existing soil vapor extraction (SVE) system be removed <br /> because recent system performance operation data indicates that SVE is no <br /> longer a cost effective remedial technology. After review of the site information <br /> and recent data EHD approves of removal of the SVE equipment. <br /> The "Summary of Gauging and Sampling Activities " in the report states that the <br /> groundwater gradient and flow direction is to the southeast. This should be <br /> corrected to state that it is to the northeast as shown in figure 2 of the report. <br /> The monitoring data sheets in the report indicate that monitoring well 11 is <br /> damaged. This well must be repaired so that it is functional for groundwater <br /> sampling. Provide EHD with details on the damage to this well and how it will be <br /> repaired by March 1, 2005. <br /> If you have any questions contact me at (209) 468-3449. <br /> Donna Heran, RENS, Director <br /> Environmental Health Department <br /> Margaret Lagorio, Supervising REHS <br /> Unit IV <br /> c: SJCADA — David Irey <br /> SECOR — Clinton Harms <br /> CVRWQCB —Jim Barton <br />