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PUBLIC HEALTH SERVrC�S oPa� N <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 `'FORS <br /> 209/468-3420 <br /> DANIEL SILVA <br /> WEST CLAY PROPERTIES <br /> PO BOX 6152 <br /> STOCKTON CA 95206 (/ <br /> WORKPLAN: Feasibility Pilot Tests Work Plan DATED:Tan 31,2000 <br /> PREPARED BY: Advanced GeoEnvironmental <br /> APPROVED ❑ See Below <br /> DISAPPROVED ❑ <br /> ADDENDUM ❑ Submit by <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S 25299.37,subd.(c)(3).): <br /> The 3 proposed soil borings/monitoring wells (MWs), analyses of the soil samples, and quarterly <br /> sampling of these MWs are necessary to define the vertical and horizontal extents of the contamination <br /> in soil and groundwater. The air sparging(IAS) feasibility test and pump test are needed to evaluate <br /> alternative corrective technologies for the preparation of a Corrective Action Plan (CAP). <br /> COMMENTS AND CONDITIONS: <br /> 1. PHS/EHD recommends installing two separate individual MWs for each dual-completed nested <br /> MW. Dual-completed MWs are often problematic to install and destroy, and can produce <br /> questionable samples if not constructed right. <br /> 2. PHS/EHD recommends using helium and helium detectors for the IAS test. The point of <br /> original and the path of travel should be logged during an IAS test; therefore, a tracer is <br /> recommended. Helium is one of the few gaseous tracer which behaves similar to natural <br /> subsurface air movement. <br /> 3. Submit to PHS/EHD the schematics of the IAS test system/equipment, and the maximum <br /> performance the compressor is rated at before conducting test. <br /> 4. PHS/EHD recommends performing the pump test for no less than 24 hours. <br /> 5. Provide to PHS/EHD the rate of extraction of the pump test. <br /> 6. A WP addendum is not necessary if these conditions are agreed to and met. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25299.37, subd.(C)(3).): <br /> DATED BY <br /> Cc: CRWQCB,Central Valley Region—Marty Hartzell <br /> Fax: Advanced GeoEnvironmental, Inc.—Kevin McKibben <br /> A Division of San Joaquin County Health Care Services <br />