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16 <br /> 4 Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 <br /> Manna Pro, 4004 South EI Dorado, Stockton, CA 6 <br /> selected based on lithology and field readings with a PID Samples were submitted from various <br /> depths from each observation well boring The depth of each sample and analytical results are <br /> summarized in Table 2 Laboratory analytical reports are provided in Appendix A <br /> ' Each of the observation wells consist of a 2-inch-diameter piezometer and three nested vapor <br /> probes The piezometers were constructed with 2-inch-diameter, 0 02-inch, slotted PVC screen and <br /> 2-inch-diameter PVC casing completed into the saturated zone to a total depth of 50 feet Sand <br /> pack was placed 5 feet above the screen and a 1-foot bentonite seal was installed as a barrier to <br /> flow through the annular space between the borehole wall and the piezometer casing Three nested <br /> ' vapor probes were installed above the piezometer in the vadose zone at depths of 10, 20 and 30 <br /> feet below grade Five feet of sand was placed around the vapor probe and a 1-foot bentonite seal <br /> ' was placed above the sand pack for each probe Teflon'" tubing (0 25 inch) was run to grade from <br /> each probe inside the annular space The remainder of the borehole was filled with cement grout <br /> The observation wells were completed with 2-inch-diameter locking well caps and bolt down <br /> manholes Sod boring and well construction logs are presented in Appendix B <br /> The purpose of the piezometers was to monitor the effects of the pumping test on groundwater <br /> levels and vacuum influence in the vadose zone (see Section 5 0) <br /> After installation, each piezometer was developed by a surge and bail technique to remove <br /> suspended sediments and to improve hydraulic communication with the aquifer Well development <br /> water was placed in 55-gallon drums and stored on site pending appropriate disposal Wellhead <br /> ' elevations were surveyed by Groundwater Technology field staff relative to existing monitoring wells <br /> 3 0 PHYSICAL CHARACTERIZATION <br /> Based on data collected during the installation of soil borings, monitoring wells and vapor probes <br /> during this investigation and previous investigations, the physical characteristics of the site have <br /> been defined This section discusses the physical characteristics of the site including site <br />' topography and site hydrogeology <br /> • <br /> 2819 8034 070 <br />' FGROUNDWATER <br /> OR TECHNOLOGY, INC <br />