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APPENDIX II SOIL BORING PROCEDURES Soil borings will be made using a truck-mounted 8-inch, hollow-stem auger drill rig. An AEMC geologist will maintain a continuous log of the soils penetrated and note soil type, color, and obvious contamination. Soils will be classified in accordance with the Unified Soil Classification System (USCS). Relatively undisturbed soil samples will be collected in each hollow stem auger boring at approximately 5- to 10-foot intervals using a California modified split spoon sampler. The sampler will be driven 18 inches ahead of the drill bit using a 140-pound hammer with a 30-inch drop. The number of blows necessary to drive the sampler will be recorded on the boring logs as a qualitative measure of the soil's density and cohesion. The split spoon sampler will be fitted with 6-inch long, 2.5-inch diameter brass sleeves. Upon retrieval of the sampler from the borehole, soils will be screened for organic vapor emissions using a Microtip portable photo-ionization detector (PID). The samples will be monitored by recording peak readings while separating the brass sleeves in the sampler. Organic vapor emissions will be recorded in volumetric parts per million (ppm). Subsequent to vapor monitoring, the exposed ends of the sleeves will be covered with Teflon sheeting, fitted with plastic end caps, sealed with electrical tape and labeled. Sample labels will include the following information: (1) boring number; (2) sample number; (3) date; (4) collector initials; (5) owner; and (6) location Soil samples will be stored in an ice chest cooled with blue ice. Samples will be delivered under Chain-of-Custody to a California State certified laboratory for analysis. Before advancing each boring, the downhole drilling equipment (auger sections) will be steam cleaned to help prevent cross-contamination from the previous borings. Sampling equipment R I MBC-1 LDOC(na l)