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D. CORRAL HOLLOW SANITARY LANDFILL <br /> CHSL is located at 31130 South Corral Hollow Road, in southern San <br /> Joaquin County, approximately five miles south of the City of Tracy, at the <br /> intersection of Interstate 580 and Corral Hollow Road. CHSL covers <br /> approximately 58 acres, of which 43 acres was permitted disposal area. <br /> The remaining area is comprised of access roads, storm water retention <br /> ponds, setbacks for environmental monitoring, and firebreaks. Land within <br /> 1,000 feet of the facility is used for grazing and agriculture. <br /> CHSL was certified closed in 1996. The closure cover consists of a two to <br /> six-foot foundation layer under a one-foot minimum thick, low permeability <br /> soil layer, covered by a one-foot thick vegetative surface layer. Currently <br /> CHSL is under post closure maintenance. <br /> 1.3 REASON FOR INSTALLING POLYETHYLENE (PE) TUBES INSIDE OF <br /> PVC PIPES <br /> The reason for installing PE tubing inside of existing PVC pipes is to reduce <br /> the sample time spent, saving labor hours and labor costs. Currently, it <br /> takes up to 5-45 minutes to collect a sample of air from the soil gas wells at <br /> the various sites, depending upon well depth. By installing the tubes in side <br /> the pipes, sample times may be reduced to as little as several minutes per <br /> sampling well. <br /> 1.4 SOIL GAS MONITORING WELLL GTI <br /> Soil Gas Monitoring Wells are located along the perimeter of the individual <br /> landfills. Please refer to figures 1-4 for maps of the well locations. <br /> 2.0 WORK TASKS <br /> It is the plan to bring all materials on site ready to install. It is possible that <br /> some tubing may need to be perforated on site. If no on site perforation is <br /> needed, then the on site work tasks will include: <br /> 1. the removal of existing connection valves; <br /> 2. assembly of the upgraded connection ports, PE tubes, and metal rod; <br /> 3. feeding of the PE tube inside the PVC pipe and lowering of the PE tube <br /> until the tube reaches the bottom of the sampling well; <br /> 4. connect the new port to the top of the PVC pipe <br /> 5. cutting and removing any excess PE tube to complete the upgrade. <br /> There are three different types of sampling wells that will require a change <br /> to the as built sampling ports. At FHSL and NCRCSL, the PVC pipes are <br /> Work Plan-Groundwater Monitoring Well Installation San Joaquin County <br /> March 28,2012 Department Of Public Works <br /> 2 Solid Waste Division <br />