Laserfiche WebLink
r <br /> srAr60FOAUPOr RI► <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOAiR - a e0 ► <br /> CENTRAL VALLEY REGION <br /> 34131 NM <br /> SACWARM.CA 06sz7-3006 <br /> 12 October 1989 U <br /> Ms. Mane Hinson Oct <br /> Registered Environmental Health Specialist <br /> Environmental Health Division FEAL <br /> San Joaquin County IDepartment of Public Health Services <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> R l I TRUCKING, IM NORTH CORRAL HOLLOW ROAD, TRACY, PHASE I <br /> PRELIMINARY SITE ASSESSMENT WM PLAN <br /> We have reviewed the 20 September 1989 "Phase I Site Assessment Work <br /> Plan" prepared by Geological Technics, for this site. One ground water <br /> monitoring well is :proposed in the former underground storage tank area. <br /> During a previous investigation, hydrocarbons were detected in soils <br /> beneath three of the underground storage tanks. <br /> We agree with the consultants determination that a ground water <br /> investigation is necessary. However, we do not believe that a single <br /> ground water monitoring well is appropriate for this investigation. <br /> If a single monitoring well were installed, as proposed, it may not be <br /> possible to detect contaminants which may have reached ground water <br /> downgradient from the monitoring well location. Because the local <br /> ground water flow direction cannot be determined from a single well, a <br /> minimum of three wells are necessary to complete the first phase of <br /> ground water investigation. <br /> The site operator should submit an addendum, to the work plan indicating <br /> the proposed locations for a minimum of three ground water monitoring <br /> wells. In addition, the monitoring wells should be designed to include <br /> an appropriate seal which will prevent the intrusion of the bentonite <br /> grout into the sand filter pack. <br /> If you have any questions, please call me at (916) 361-5731. <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br />