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I <br /> APPENDIX A <br /> EXPLORATORY BORING AND WELL INSTALLATION <br /> PROCEDURES <br /> TM general procedures, which will be used for drilling exploratory borings, collecting <br /> samples, and installing monitoring wells, are described in this appendix. ]here general <br /> procedures are used to provide consistent and reproducible results; however, conditions <br /> may exist where variations of these procedures are applicable. The following procedures <br /> supervised by a California staWregiste rst geologist. <br /> B-Zone Exploratory Sol] Borings and Well Installation <br /> Procedures <br /> The exploratory soil borings for the B-zone groundwater monitoring well will be drilled <br /> using Iz-inch-diameter. continuous-night, hollow-stem auger drilling equipment. The <br /> boring will be drilled down to a depth of approximately five fact below the screened <br /> interval of the adjacent A-Zone. Monitoring Well MW- (approximately by fact bgs) and <br /> conductor casing will be handled in the boring. The conductor will be placed in the <br /> borehole and driven approximately one to two feet into the clay soil. The annular space <br /> will be grouted to the surface with a cenrent and bentonite grout. The conductor pipe <br /> gram seal will be allowed to set for a nnidmum of24 hours before drilling proceeds. The <br /> boring will continue using B--inch diameter hollow-stem pagers to total depth. <br /> Soil samples for logging will be obtained from auger-retum materials and by advancing a <br /> modified California split-spoon sampler equipped with brass or stainless sleet liners into <br /> undisturbed soil beyond the tip of the auger. Soils will be logged by an Tf geologist <br /> according to the Unified Soil Classification System and standard geological techniques. <br /> The soil snorters will be cleaned with a detergent water solution, wised with clean <br /> water, and Nuipped with clean liners between samplingval intes. Augers and samples <br /> will be sleam cleaned between each boring to reduce the possibility of cross <br /> contarumation. <br /> Drill cuttings generated during the drilling procedure will be stockpiled on site. <br /> Stockpiled drill coatings will be placed on and covered with plastic sheeting. The <br /> stockpiled soil will be characterized by collecting and analyzing composite samples from <br /> the stockpile. IT will recommend an appropriate method for disposition of the cuttings <br /> based on the analytical cents. The client is responsible for disposal of the drill cuttings. <br /> lr vfiFv Mrno6 <br /> tuACpseocnumnme�.n�uvnuom6A at.:: <br />