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• <br /> APPENDIX A <br /> EXPLORATORY BORING AND WELL INSTALLATION <br /> PROCEDURES <br /> The general procedures used in site assessments for drilling exploratory borings, <br /> collecting samples, and installing monitoring wells are described in this appendix These <br /> general procedures are used to provide consistent and reproducible results, however, <br /> conditions may exist where variations of these procedures are applicable The following <br /> procedures 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 8- 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 were obtained from auger-return materials and by advancing a modified <br /> California split-spoon sampler equipped with brass or stainless steel liners into <br /> undisturbed soil beyond the tip of the auger Soils were logged by an EMCON geologist <br /> according to the Unified Soil Classification System and standard geological techniques <br /> The soil sampling equipment was cleaned with a detergent water solution, rinsed with <br /> clean water, and equipped with clean liners between sampling intervals Augers and <br /> samplers were steam cleaned between each boring to reduce the possibility of cross <br /> contamination Steam cleaning effluent was contained in 55-gallon drums and <br /> temporarily stored on site The disposal of the effluent is the responsibility of the client <br /> Drill cuttings generated during the drilling procedure were stockpiled on site Stockpiled <br /> drill cuttings were placed on and covered with plastic sheeting The stockpiled soil was <br /> characterized by collecting and analyzing composite samples from the stockpile The <br /> client is responsible for disposal of the drill cuttings <br /> Soil samples for chemical analysis were collected in brass or stainless steel liners, sealed <br /> with Teflon tape and plastic end caps, labeled, placed on ice, and delivered to a <br /> state-certified analytical laboratory, along with the appropriate chain-of-custody <br /> ME 1APACHEIREP0R1*SWACP162 DOC-981Isg 1 Mon <br />