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disposed in the bioremediation cell area located on site Soils were classified according to Universal Soil <br />' Classification System (USCS) Lithologac soil boring logs for each of the wells are presented in <br /> Appendix G <br /> Monitoring wells were constructed of 4-inch-diameter schedule 40 PVC consisting of 15 feet of <br /> 0 020 inch slotted casing and the remaining length blank casing The monitoring wells were constructed <br />' through the hollow stem of the augers All casing including the screw-on bottom caps and slip-on top <br /> caps was steam cleaned prior to installation After installation, a filter pack was placed approximately <br /> two feet above the screened interval using #3 Monterey sand After placement of the filter pack, each <br />' well was surged with a surge block for 15 minutes to help settle and pack the sand. A minimum two-foot <br /> bentonite seal was then placed above the sand using 318-inch bentonite pellets Five gallons of distilled <br />' water was then added to the bentonite to produce an effective seal before grouting The remaining <br /> annular space was grouted to the ground surface using a mixture of neat cement with 2% bentonite <br /> Grout was pumped through a tremmie pipe while the augers were gradually removed from the boring to <br /> tminimize the potential for caving Each well casing was cut off about 5 inches below ground surface, <br /> fitted with a PVC cap, and enclosed in a steel sleeve with a locking lid The locking steel sleeves are <br />' encased in a Christy box and are finished at grade with concrete Elevations of these wells were later <br /> surveyed to the nearest 0 01 foot Surveying was conducted by Earnest Smith& Associates of Stockton, <br /> California Well completion data is summarized in Appendix G <br /> The monitoring wells were developed by surging with a surge block for a minimum of 30 <br />' minutes, then bailing with a teflon bailer Measurements of the pH, specific conductivity and temperature <br /> were taken at regular intervals during development until these parameters stabilized and the produced <br />' water which was relatively free of fine particles A minimum of 55 gallons of water was purged and <br /> approximately 1 112 hours of development time was spent on each well The teflon bailer and surge <br /> block were thoroughly steam cleaned between each well Water produced during development was placed <br />' in DOT-approved drums, closed, properly labeled and kept on site <br /> 3 3 GROUNDWATER MONITORING <br />' This section describes the results of water level measurements, groundwater sampling, and <br /> analytical results of water samples Travel blanks and quality control duplicate samples are not reported, <br /> because they reported non-detectable concentrations of all analytes tested Laboratory reports of all <br />' groundwater and QC samples are attached in Appendix H <br /> r <br /> 5AC36 046 12 <br />