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Appendix A <br /> EXPLORATORY BORING AND <br /> WEA - INSTALLATION PROCEDURES <br /> The procedures which were used for drilling exploratory borings, collecting <br /> samples, and installing monitoring wells are described in this appendix. <br /> The following procedures were supervised by a California state-registered <br /> geologist. <br /> Exploratory Soil Borings <br /> Too exploratory soil borings for the seasonal ground-water monitoring <br /> wells were drilled using 8-inch-diameter, continuous-flight, hollow-stem <br /> -� auger drilling equipment. Soil samples for logging were obtained from <br /> auger-retum materials and by advancing a modified California split-spoon <br /> sampler equipped with stainless steel liners into undisturbed soil beyond <br /> - the tip of the auger. Soils were logged by an EMCON geologist consistent <br /> with the Unified Soil Classification System and standard geological tech- <br /> niques. The deep well was drilled using air-rotary drilling equipment. A <br /> modified California split-spoon sampler was used for sampling the first 15 <br /> feet of the soil bvnng, and the remainder of the boring was logged using <br /> - drill cuttings. <br /> The soil samplers were cleaned with a detergent water solution, rinsed <br /> with clear, water, and equipped with clean liners between sampling inter- <br /> vals. Augers and samplers were steam cleaned between each boring to <br /> reduce the possibility of cross contamination. <br /> Drill cuttings generated during the drilling procedure were stockpiled on <br /> site. Stockpiled drill cuttings dere placed on and covered with plastic <br /> sheeting. The stockpiled soil typically characterized by collecting and <br /> analyzing composite samples 1. 'n the stockpile. EMCON will recommend <br /> - pi9X3051g050101d A t Rev. 0 July 2, 195,1 <br />