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PUBLIC; HEALTH SERVICES <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 /> Fo <br /> DANIEL SILVAL <br /> WEST CLAY PROPERTIES <br /> PO BOX 6152 SEP 21 2001 <br /> STOCKTON CA 95206 <br /> RE: West Clay Properties Site Code: 1065 <br /> 639 West Clay Street <br /> Stoclaon,CA 95206 <br /> WORKPLAN: Monitoring Well Installation Work Plan Addendum DATED:September 20,2001 <br /> PREPARED BY: Advanced GeoEnvironmental <br /> APPROVED X See Below <br /> DISAPPROVED ❑ <br /> ADDENDUM ❑ Submit by: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN(H&S 25299.37,subd.(c)(3).): <br /> 1. 4 CPT borings to about 100 feet bsg to collect grab ground water samples in the vicinity of <br /> the former UST area to the north and the former UST No.3 area for the purpose of <br /> defining the extent of the contamination in groundwater and to provide geological data <br /> required for installation of monitoring wells. <br /> 2. Installation of 3 monitoring well(MVS clusters,each cluster comprised of 2 MWs screened <br /> at different depths in the area of the former UST in the north area. These MWs are <br /> necessary to define the vertical and horizontal extents of the contamination in groundwater. <br /> 3. Installation of 2 monitoring wells to the south of the former UST No.3 area to determine <br /> lateral extent of the contamination in groundwater: <br /> 4. Analyze soil and water samples for BTEX,oxygenates,gas and diesel. Analyze soil samples <br /> for physiochemical properties and bionumberation to determine viability of natural <br /> attenuation as a potential remediation alternative. <br /> 5. One 24 hour constant rate pump test at 4 gallons per minute in the UST No.3 area. One 8- <br /> hour variable rate pump test and subsequently a 24-hour constant rate pump test(based on <br /> the results of the 8-hour pump test) in the former UST area to the north. Data is necessary <br /> for evaluation of aquifer characteristics,contaminant movement in groundwater,and <br /> feasibiliryof remediation alternatives. <br /> COMMENTS AND CONDITIONS: <br /> 1. Location of the MW and the selection of the screen depth and length are subjected to <br /> change based on the results of the CPT. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN(H&S 25299.37,subd.(q(3).): <br /> None <br /> DATED Z I �' BY <br /> i <br /> Cc: CRWQCB,Central Valley Region-Marry Hartzell <br /> Fax: Advanced GeoEnvironmental,Inc.- Paul Dotson <br /> A Division of San Joaquin County Health Care Services <br />