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i <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 instaIIing 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 were drilled using 8-inch-diameter, continuous-flight, hollow-stem auger <br /> dulling equipment Soil samples for logging were obtained from auger-return materials <br /> and by advancing a modified California split-spoon sampler equipped with brass or <br /> stainless steel liners into undisturbed soil beyond the tip of the auger Soils were logged <br /> by a Pinnacle geologist according to the Unified Soil Classification System and standard <br /> geological techniques Exploratory soil borings not used for monitoring well installation <br /> were backfilled to the surface with a bentonite-cement slurry pumped into the boring <br /> through a tremie pipe <br /> The soil sampling equipment was cleaned with a detergent water solution, rinsed with <br /> clean water, and equipped with clean Iiners 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 was conducted at the conclusion of <br /> the investigation <br /> Drill cuttings generated during the drilling procedure were stockpiled on site Stockpiled <br /> drill cuttings were placed in 20 cubic yard bins The stockpiled soil was typically <br /> characterized by collecting and analyzing composite samples from the stockpile <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 /> CP\E 1ARC010548\RBP0RTS10548P201 DOC 9811sg 1 <br /> A-I! <br />