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STATEOF CALIFORNIA f , GEORGE DEUKf IEJIAN Governor <br /> -WT, J .--- <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 13 February 1990 <br /> p <br /> Ms. Diane Hinson _ <br /> Supervising REHS I <br /> San Joaquin County <br /> Department of Public Health Services <br /> I Environmental Health Division <br /> P.O. Box 2009 <br /> j. Stockton CA 95201 <br /> CITY OF STOCKTON, SMITHS CANAL PUMPING PLANT, FONTANA AVENUE, STOCKTON - f <br /> If PROBLEM ASSESSMENT REPORT <br /> We have reviewed the 15 January 1990 Problem Assessment Report prepared <br /> by WaterWork for this site. The investigation included installation and <br />[ sampling of four ground water monitoring wells and two soil borings on- <br /> site. <br /> Soil and ground water beneath the site have -been. impacted by discharges <br /> of petroleum hydrocarbons from a damaged. underground diesel tank. Total <br /> petroleum hydrocarbon levels up to'32,000 parts per billion were reported <br /> in monitoring well MW-4, located near the tank. Based on the ground water <br /> gradient maps included in the report, there is an area of ground water <br /> mounding to the south of well MW-4. This mounding may be due to leakage <br /> from the sewer pipe in that area. <br /> Ground water samples obtained from the on-site monitoring- wells were also <br /> analyzed for total and fecal coliform bacteria. Total coliform i <br /> concentrations in excess of 1,600 per 100 milliliters were reported in two <br /> of t-he on-site monitoring wells. The concentrations of coliform in ground <br /> water at..this site present a_,serious health .threat. <br /> One of the objectives of the next phase of investigation must be to locate <br /> and eliminate the source of the coliform contam,ination.. In addition, the <br /> operator should be required to define the extent of both the coliform and <br /> petroleum hydrocarbon contamination in soil. and ground water. <br /> If you have any questions, please call me at (916) 361-5731. <br /> THOMAS D. PELTIER ` <br /> Engineering Geologist <br /> TDP/tdp <br />