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• f1HR 12 19 14:42 C7K:C I 163715821 P.a APPENDIX A DRILLIN ►MPLiNG ( F SOIT. BO NffiS Appendix A presents C.K.C., Inc. standard protocol for the drilling and collection of soil samples from soil borings using the hand auger drilling method. DREMING EQUIPMENT Soil borings will be drilled using the hand auger drilling method. Augers will be 3.25-inch outside diameter (O.D.) and 2.75-inch inside diameter (I.D.). Soil samples will be collected using a core soil sampler which contains one 6-inch long by 2-inch diameter brass tube. Soil samples will be collected at specified intervals by driving the soil core sampler into the bottom of the borehole using a 15-pound drop hammer falling 16 inches. Steam Cleanige of Drilling_EQuigment All drilling equipment placed into the borehole will be steamed cleaned prior to arriving at the job site and between beginning work at each successive boring location. The soil core sampler will be cleaned after each collection of a soil sample by washing in a solution of msodium phosphate and water, rinsing in clean water and a final rinsing using deionized water. SOIL SAMPLING AND LOGGING Soil samples will be collected at intervals described in Task 2.0 of this Plan. After the soil core sampler is retrieved from the selected interval, the filled brass tube will be removed from the sampler. Each end of the tube will be sealed using a teflon sheet secured by a plastic cap and tape. A label is also placed on the tube. This label will describe the sample identification number, site identification, date and time of collection, sampler identification, and requested analyses. Lithologic logging and field screening for the potential presence of chemicals will be conducted on cuttings retrieved during manual augering. Lithologic descriptions will be prepared in accordance with the Unified Soil Classification System by a qualified C.K.C., Inc. geologist. Each lithologic description will be subsequently reviewed by a California Registered Geologist or Certified Engineering Geologist for accuracy and completeness. Field screening for the potential presence of chemicals is conducted using headspace monitoring techniques. A small portion of soil obtained will be placed in a plastic bag or glass jar. The soil within the bag or jar will be placed in a warm area to promote the volatilization of chemicals. Headspace within the bag or jar will be evaluated using an nar,ar.o6 A-1