Laserfiche WebLink
17325532.01010 MAY 2 2006 <br /> May 18, 2006 <br /> ENViRTJf.'IENT HEALTH <br /> Mr. Robert McClellon <br /> Supervisor R.E.H.S. <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202-2708 <br /> Subject: Work Plan to Install Groundwater Monitoring Wells <br /> World Enterprises Site <br /> Stockton, California <br /> Dear Mr. McClellon: <br /> URS has prepared this work plan on behalf of RadioShack to install three groundwater monitoring wells <br /> at the World Enterprises site in Stockton, California. Enclosed with this letter work plan are a completed <br /> Well/Pump Permit application for the monitoring well installation,and a check for the amount of$368 to <br /> cover the cost of the permitting fees for these activities. <br /> This work plan has been organized into the following sections: Background,Field Activities,Permit, <br /> and Schedule. <br /> BACKGROUND <br /> The World Enterprises site is located in Stockton,California. This site was used as a debris disposal <br /> site(debris from demolished buildings to include wood, rubble,concrete, and other fill materials)under <br /> permit during the 1970s. URS has installed ten gas-migration monitoring probes and two vapor <br /> extraction wells at the World Enterprises site(Figure 1)during our field investigation activities. A <br /> vapor extraction pilot test was conducted in December 2005. During this test, vapor samples were <br /> collected from the two extraction wells and analyzed for volatile organic compounds(VOCs). The <br /> analytical results for the VOC analysis showed that the total VOC concentration in either of the vapor <br /> extraction wells was less than 5 parts per million by volume (ppmV). To assess the presence or absence <br /> of VOCs in groundwater, we propose required to install three groundwater monitoring wells. This work <br /> plan describes the planned activities to install and sample the groundwater monitoring wells. <br /> FIELD ACTIVITES <br /> URS plans to install 3 borings (Figure 1). One boring will be installed near probe VW-1; one boring <br /> will be installed near probe VW-5, and one boring will be installed near extraction well EW-2. We plan <br /> to advance each boring to a depth of approximately 28.5 feet below the ground surface(bgs)using a <br /> truck-mounted drill rig equipped with hollow-stem augers. (During installation of the vapor extraction <br /> wells in June 2005, groundwater was encountered between 20 and 25 feet bgs, with a static groundwater <br /> surface of 18.5 feet bgs within the boring for EW-1.) Soil samples will be collected from all borings <br /> using a clean California-modified split-spoon sampler fitted with brass liners. Soil samples will be <br /> collected at 5-foot intervals and/or at changes in lithology. The field geologist will log the soil from <br /> each boring using the Unified Soil Classification System. <br /> URS Group, Inc. <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive, Suite 150 <br /> Sacramento,CA 95833 <br /> Tel:916.679.2000 <br /> Fax:916.679.2900 <br />