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x - APPENDIX A GENERAL FIELD PROCEDURES-DRILLING AND SOIL SAMPLING A description of general field procedures conducted during drilling activities are presented below. The soil borings were drilled using 8-inch-diameter, continuous-flight, hollow-stem augers. Soil samples were collected continuously from each soil boring. Continuous sampling was performed using a 5-foot-long, continuous core sampler fixed inside the lead auger. The core sampler was washed with a sodium tripolyphosphate solution and rinsed before each use. Upon retrieval, the care sampler was split and 1.5-inch-diameter, stainless steel sample tubes were driven into the core. The sample tubes were removed and securely sealed with Teflon sheeting and polyurethane caps. The sample was labeled with sample identification, sample depth, geologist's initials, and date of collection. The soil sample was kept .on ice prior to and during transport to a California certified - laboratory. Drilling and SOJA Sampling (Mon-itoring Kel.1 Installa The soil borings for monitoring well installation were drilled using 10--inch-diameter, continuous-flight, E-,y hollow-stem augers. Soil samples were collected at 5-foot intervals, beginning at 5 feet below grade and terminating at approximately 25 feet below grade for soil description and 4 laboratory analysis. Soil samples were retrieved ahead of the lead auger utilizing an 18-inch-long by 2-inch-diameter, split-spoon sampler lined with 1.5-inch-diameter, stainless steel sample inserts. The sampler and sample tubes were j washed with a sodium tripolyphosphate solution and rinsed before each-use. - The- sampler was driven by a 30-inch free fall of a 140-pound hammer. Blow counts were recorded for three successive 6-inch intervals. Samples collected below "" the water table were not. submitted for laboratory analysis.