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I'UBI H� <br /> SAN ]OAQL Vj COUNTYIVISION .: <br /> ENVIRONMENTAL HEAL `p. <br /> Karen Furst, <br /> M.D., M.P.H., Health Officer �c;Foa� <br /> 304 East Weber Avenue,Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> SEP 14 201 <br /> EDWARD RALSTON <br /> TOSCO MARKETING COMPANY <br /> 1380 LEAD HILL ROAD SUITE 120 <br /> ROSEVILLE CA 95661 <br /> RE: TOSCO/UNOCAL <br /> SITE CODE: 1217123 <br /> 4707 Pacific Avenue <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the 'Remedial System Enhancement Plan" dated <br /> August 8, 2001 prepared by Gettler— Ryan Inc. for the above referenced site. <br /> The plan evaluates different remedial alternatives that could be used to clean up <br /> the gasoline contaminated groundwater remaining at this site. <br /> The plan recommends installing an ozone microsparging system and evaluating <br /> the system for effectiveness. In addition, the plan recommends replacing the <br /> current vapor extraction system (catox) with a mechanical blower with an <br /> activated carbon abatement system. PHS/EHD approves of these <br /> recommendations. Please submit the detailed system design within 30 days as <br /> proposed in the plan. <br /> If you have any questions contact me at (209) 468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Margaret Lagorio, Supervising REHS <br /> Unit IV <br /> c: SJCADA — David Trey <br /> Dayton Hudson Corp — David Luick <br /> Union Oil — Michael Buck Esq. <br /> Gettler Ryan — Clyde Galantine <br /> CVRWQCB — Marty Hartzell <br /> A Division of San Joaquin County Health Cate Services <br />