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PUBLIC HEALTH SER CES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> <ROBERT COCHRAN <br /> CHEVRON PRODUCTS COMPANY . <br /> P O BOX 6004 <br /> SAN RAMON CA 94583-0904 <br /> RE: Chevron Service Station 9-00557 <br /> 139 South Center Street <br /> Stockton,CA 95202 <br /> WORKPLAN: Addendum No. 2 to Work Plan for Feasibilijy Testing/Corrective Action Plan Preparation <br /> DATED: 1/4/02 <br /> 'PREPARED BY: SECOR Corporation <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 /> 1. . Advance four soil borings to approximately 45 feet below ground surface(bgs)and install dual completion <br /> ozone sparge points in each of the boreholes(for a total of eight sparge points). The sparge points will be <br /> completed to 30 and 45 feet bgs in each borehole. Perform the Ozone Sparge pilot test for a minimum of <br /> three months. <br /> 2. Analyze groundwater samples taken from wells in the treatment area for TPHg,TPHd,TPHmo,BTEX, <br /> and fuel oxygenates. <br /> 3. Submit a report of findings for the Ozone Sparging Test in the Corrective Action Plan(CAP),along <br /> with the results of the other feasibility tests and monitoring well installations. <br /> C01%1MENTS AND CONDITIONS: <br /> 1. After discussion with Regional Board on 1/11/02,PHS/EHD and the Regional Board concluded that it is <br /> important to leave MW-7 screened at the depth it is at presently(32-52 feet bgs). Continue with your <br /> effort in procuring an encroachment permit for the installation of MW-13 from Cal Trans. <br /> 2. Obtain a well permit from PHS/EHD and notify PHS/EHD at least 48 hours prior to the proposed <br /> scheduled work dates. <br /> DATED A) BY ` <br /> cc: CVRWQCB-Marty Hartzell <br /> SECOR Corporation _ <br /> A Division of San Joaquin County Health Care Services <br />