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' Appendix B EXPLORATORY BORING AND WELL INSTALLATION PROCEDURES The procedures which were used for drilling exploratory borings, collecting ' samples, and installing monitoring wells are described in this appendix. The following procedures were supervised by a California state-registered geologist. ' Exploratory Soil Borings ' The exploratory soil borings for the ground-water monitoring wells (MW-12 and MW-13) were drilled using 8-inch-diameter, continuous-flight, hollow-stem auger drilling equipment. The exploratory soil boring (1392-1) was drilled using 6-inch-diameter, continuous flight, hollow-stem auger drilling equipment. Soil samples for logging were obtained from auger-return materials and by advancing a modified California split-spoon sampler ' equipped with stainless steel liners into undisturbed soil beyond the tip of the auger. Soils were logged by an EMCON Associates geologist consistent ' with the Unified Soil Classification System and standard geological techniques. The soil samplers were cleaned with a detergent water solution, rinsed with ' clean water, and equipped with clean liners between sampling intervals. Augers and samplers were steam cleaned between each boring to reduce the possibility of cross-contamination. ' Drill cuttings generated during the drilling procedure were stockpiled on site. Stockpiled drill cuttings were placed on and covered with plastic sheeting. ' EMCON Associates will recommend an appropriate method for disposition of the cuttings based on the soil analytical results. The client is responsible for disposal of the drill cuttings. ' Soil samples for chemical analysis were collected in stainless steel liners, sealed with Teflone tape and plastic end caps, labeled, placed on ice, and delivered to a state-certified analytical laboratory, along with the appropriate chain-of-custody documentation. pjOV9010*00020.1 ag B - 1 Rev. 0 December 15, 1992