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PUBLIC HIPALTH SERVIS <br /> P <br /> SAN JOAQUIN COUNTY - .� <br /> r. <br /> ENVIRONMENTAL HEALTH DIVISION ? " <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 4t <br /> 209/468-3420 <br /> NICK NICKERSON <br /> UNOCAL CORPORATION <br /> 8788 ELK GROVE BLVD. <br /> BUILDING 3, SUITE 15 <br /> ELK GROVE CA 95624 <br /> RE: FORMER UNOCAL STATION H 0187 <br /> 437 EAST MINER <br /> STOCKTON,CA 95202 <br /> WORKPLAN: Work Plan for Additional Subsidy a Assessment and Fe ability Study <br /> DATED: 9/14/00 <br /> PREPARED BY: Gettler-Ryan Inc <br /> APPROVED X <br /> DISAPPROVED ❑ <br /> ADDENDUM ❑ Submit by: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN(H&S 25299.37,subd.(c)(3).): <br /> I. Installation of six monitoring wells to approximately 75 feet below surface grade(bsg)to assess the <br /> vertical extent of the"intermediate" zone of contamination. <br /> 2. Installation of six monitoring wells to approximately 120 feet bsg to assess the vertical extent of the <br /> "deep" zone of contamination. <br /> 3. Implementation of remedial option for groundwater contamination. <br /> 4. Implementation of remedial option for vadose zone contamination. <br /> COMMENTS AND CONDITIONS: <br /> 1. Submit a site specific Health and Safety Plan prior to scheduling work <br /> 2. Encroachment permits must be obtained from San Joaquin Public Works Department prior to <br /> monitoring well installation. <br /> 3. Work must be completed within 90 days of approval date below,including initiation of the ozone <br /> microsparging system. Evaluation of the ozone microsparging system must be completed within nine <br /> months of approval date below. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN(H&S 25299.37,subd.(C)(3).): <br /> DATED 9/27/00 BY Dot Lofstrom / <br /> Cc: CVRWQCB—Marty Hartzell <br /> Gettler-Ryan—Greg Gurss(fax) <br /> A Division of San Joaquin County Health Care Services <br />