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' h <br /> PUBLIC HEALTH SER ICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION y: <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 304 E.Weber Ave., 3rd Floor • P. O. Box 388 • Stockton, CA 95201-0388 meq... .•. �' <br /> 209/468-3420 F o a N <br /> GORDON MARTS <br /> f <br /> CALTRANS <br /> PO Box 2048 <br /> STOCKTON CA 95201 MAILED AUu 1 81995 <br /> Re: Caltrans Shop 10 Site Code- 10193 <br /> 1604 South "B" Street <br /> Stockton CA 95205 <br /> San Joaquin County, Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the "Site Investigation Report" dated June 1995 and prepared by Geocon <br /> Environmental Consultants. PHS/EHD has the following comments for your consideration. <br /> The report summarized results from soil and groundwater samples collected during the April - <br /> June 1995 investigation. - PHS/EHD concurs that additional soil and groundwater investigation <br /> will be necessary to delineate the extent of contamination associated with the former <br /> underground storage tanks. <br /> The report suggested that at minimum one additional soil boring in the area of the former tanks <br /> and four additional monitoring wells be drilled and installed. PHS/EHD recommends that the <br /> additional soil borings in the area of the former tanks be completed into vapor extraction wells of <br /> varying screened intervals. The groundwater investigation proposed will not adequately <br /> investigate the plume's boundaries to the west of MW3 and VW1. Please submit an addendum <br /> workplan addressing PHS/EHD's comments regarding the proposed scope of work by September <br /> 22, 1995. Also, quarterly monitoring and sampling should be initiated at the site until such time <br /> as sufficient information is available to reduce the sampling frequency. <br /> If you have any questions, please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> i <br /> Mary Meays, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> I <br /> MM/1604B <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Saiyed Ali, CalTrans <br /> A Division of San Joaquin County Health Care Services <br />