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APPENDIX A <br /> EXPLORATORY BORING AND WELL INSTALLATION <br /> PROCEDURES <br /> The general procedures used in site assessments for drilling exploratory borings, collecting <br /> samples, and installing monitoring wells are described in this appendix These 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 /> are supervised by a California state-registered geologist <br /> Exploratory Soil Borings <br /> . Exploratory soil borings for sites characterized by relatively shallow (less than 100 feet <br /> deep) groundwater are generally drilled using S- to 12-inch-diameter, continuous-flight, <br /> hollow-stem auger drilling equipment The drilling method for sites in which depth to <br /> groundwater is greater than 100 feet is determined on a case-by-case basis Soil samples <br /> for logging will be obtained from auger-return materials and by advancing a modified <br /> California split-spoon sampler equipped with brass or stainless steel liners into undisturbed <br /> soil beyond the tip of the auger Solis will be logged by an EMCON geologist according to <br /> the Unified Soil Classification System and standard geological techniques Exploratory soil <br /> borings not used for monitoring well installation will be backfilled to the surface with a <br /> bentonite-cement slurry pumped into the boring through a tremie pipe <br /> The soil sampling equipment will be cleaned with a detergent water solution, rinsed with <br /> clean water, and equipped with clean liners between sampling intervals Augers and <br /> samplers will be steam cleaned between each boring to reduce the possibility of cross <br /> contamination Steam cleaning effluent will be contained in 55-gallon drums and <br /> temporarily stored on site The disposal of the effluent will be the responsibility of the <br /> client <br /> Drill cuttings generated during the drilling procedure will be stockpiled on site Stockpiled <br /> drill cuttings will be placed on and covered with plastic sheeting The stockpiled soil is <br /> typically characterized by collecting and analyzing composite samples from the stockpile <br /> CP1E 1APACHEIREPORTS\A.PACP101 DOC 981lsg 1 Emcon <br /> A-1 <br />