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MMME, <br /> Mil <br /> ig <br /> S,cw u - - R' all <br /> - <br /> X1i <br /> r M <br /> Ri <br /> W! <br /> Appendix rA <br /> EXPLORATORY BORING AND <br /> - WELL 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 /> The exploratory soil borings for the seasonal ground-water monitoring <br /> �_. wells ware drilled using 8-inch-diameter, continuous-flight, hollow-stem <br /> auger drilling equipment. Soil samples for logging were obtained from <br /> auger-return 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. Solis 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 boring, 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 clean water, and equipped with clean liners between sampling inter- <br /> vals. Augers and samplers wer£ steam cleaned between each boring to <br /> reduce the possibility of cross contamination. <br />�N <br /> Drill cuttings generated during the drilling procedure were stockpiled an <br /> site. Stockpiled drill cuttings were placed an and covered with plastic <br /> sheeting. The stockpiled soil is typically characterized by collecting and <br /> analyzing composite samples from the stockpile. EMCON will recommend <br /> — pig'+9051g050101d A- 1 Rev.0 July 2,1931 <br />