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PUBLIC HEALTH SERVIChS P <br /> SAN JOAQUIN COUNTY '° 'c�c <br /> ENVIRONMENTAL HEALTH DIVISION Z <br /> Q n <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 �� �, o <br /> 9��F OwNSP <br /> 209/465-3420 <br /> OCT 13 W7 <br /> W V RAYMOND <br /> P O BOX 567 <br /> STOCKTON CA 95203 <br /> RE: California Welding Supply SITE CODE: 2083 <br /> 1000 E Eleventh St. <br /> Tracy CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the August 1997"Results of Latest Groundwater Sampling and Workplan for Removal of <br /> Additional Soil " report prepared by William J. Hunter and Associates for the above referenced <br /> site. <br /> The report concludes that the lateral limits of the soil and groundwater contamination have been <br /> defined. The plume is of limited size and has migrated less than 40 feet from the source. <br /> PHS/EHD concurs with this conclusion. However free product in groundwater has been observed <br /> in SB-2 at a depth of 11' bgs. SB-2 is bounded by the excavation, SB-5 and SB-6 all of which are <br /> which are free from liquid phase hydrocarbons. The free product appears to be confined to <br /> groundwater in the immediate area of SB-2. <br /> The workplan submitted with this quarterly report proposes an interim remedial action consisting <br /> of removal of the pump island, a limited over excavation to 5' bgs, and removal and treatment of <br /> liquid phase petroleum byproducts. PHS/EHD concurs with an over excavation approach, as <br /> opposed to an extraction well, due to the limited lateral extent and shallow occurrence of the free <br /> product. The over excavation should be extended to groundwater in order to create a sump from <br /> which collected free product may be removed. <br /> PHS/EHD requests an addendum to the workplan specifically addressing free product removal by <br /> November 14, 1997. <br /> If you have any questions, please contact Steve Sasson REHS, at(209)468-3459. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Sv asson, Senior Margaret Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> cc: Pat Anderson, CVRWQCB <br /> cc: Mel Jacobo, SWRCB <br /> cc: William Hunter, William J Hunter&Associates <br /> A Division of San Joaquin County Health Care Services <br />