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j' P.O. Box 576981-6981 <br /> M.VTT• Kloberdanz '& Associates Modesto, California 95357 <br /> Environmental Assessment Phone: (209) 577-8186 <br /> Fax: (209) 577-8158 <br /> December 10, 2002 <br /> Ms. Lori Duncan, REHS <br /> San Joaquin County Environmental Health <br /> 304 E. Weber Ave., Third Floor <br /> Stockton, California 95202 <br /> WORK P1 AN <br /> Excavation and Monitoring Well Installation, Pombo Ranch Property, <br /> 24100 S. Lammers Road, Tracy, California <br /> 1.0 PROJECT IDENTIFICATION <br /> In a January 18, 2001 letter the San Joaquin Environmental Health Department (SJEHD) <br /> made the following recommendations: <br /> 1. Excavate the source material, and initiate quarterly groundwater monitoring. The <br /> extent o f s oil c ontamination i s i invited t o t h a rea s urrounding t he f ormer gasoline <br /> UST. Removing the impacted soil should rrinimize future ground water impacts of <br /> site constituents. <br /> 2. Install a monitoring well immediately down adient of the former tank pit area. A <br /> deep monitoring well may also be necessary to determine the vertical extent of the <br /> groundwater contamination and to determine the vertical groundwater gradient. <br /> Additional deep monitoring wells may also be needed to determine the deep <br /> groundwater flow direction. All water sampl s should be analyzed for all oxygenates <br /> and gasoline additives by EPA Method 8260E. <br /> 3. A sensitive receptor survey was submitted for this site, but did not provide the well <br /> construction details (not required at the time) for the three domestic water supply <br /> wells were identified as being the only sensitive receptors located within a 2000 foot <br /> radius of the site. This information should be determined and provided to SJEHD. <br /> The closest municipal well is approximately one mile from the site. The on-site water <br /> supply well should also be included in t e quarterly monitoring and sampling. <br /> program. �E EE W E D <br /> DEC 1 6 2002 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br />