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J <br /> PUB] C HEALTH SEWICES <br /> SAN JOAQUIN COUNTY r' y <br /> Q: <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 (1601 East Hazelton Avenue) Stockton,California 95201 <br /> cq�ikpaN�P <br /> (209) 468-3400 <br /> July 26, 1990 <br /> City of Stockton C U <br /> 425 N. E1 Dorado St. <br /> Stockton, CA 95202 <br /> Attn: Jim Escobar, Department of Public Works <br /> RE: Smith Canal Pumping Plant REFER TO SITE CODE: 1102 <br /> Fontana Avenue <br /> Stockton <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has reviewed the "Problem Assessment Report" <br /> (PAR) submitted by WaterWorks on January 31, 1990. PHS/EHD has the <br /> following remarks and recommendations: <br /> A. ) Illustrate the lateral/vertical plume of contamination <br /> for groundwater and soil. Indicate where the "zero line" <br /> is located on a top view/cross-sectional diagram of the <br /> site. <br /> B. ) The bottom borehole samples should have been analyzed to <br /> support "zero line" in the vertical direction. <br /> C. ) Propose further investigative methods to be utilized to <br /> define lateral and vertical extent of contamination. <br /> D. ) The gasoline contamination detected in ground water <br /> samples (2 , 000 parts per billion) should be addressed, in <br /> addition to the diesel and other residual contaminants <br /> found in the soil and ground water samples. <br /> E. ) Refer to Tri-Regional Board Staff Recommendations, table <br /> 2 (page 17) for the minimum verification methods to be <br /> used for gasoline and diesel products. The detection <br /> limits most applicable to this investigation are those in <br /> the LUFT Manual. <br /> F. ) Groundwater samples obtained from on-site monitoring <br /> wells were analyzed for total and fecal coliform <br /> bacteria. Total coliform concentrations in excess of <br /> 1600 per 100 milliliters were reported in two of the <br /> monitoring wells. This poses a serious health threat. <br /> The source of the coliform contamination must be located <br /> and eliminated. Further sampling of the monitoring wells <br /> f6r, fecal coliform analyses is to be performed. <br /> A Division of San Joaquin County Health Care Services 0 <br />