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CSE GENESIS ENGINEERING& REDEVELOPMENT • Soil descriptions follow the name of the predominant particle size • Dimensions of the predominant and secondary sizes shall be estimated Additional information that will be entered on the boring log includes: • Boring identification • Location in relation to an easily identifiable landmark • Name of drilling contractor • Drilling method • Depth at which saturated conditions are first encountered • Sample depths • Zones of caving or heaving • Drilling rig reactions such as chattering, rod drops, and bouncing • Refusal A California Registered Geologist will review and approve the boring logs. 2.4 Decontamination Activities All equipment that may directly or indirectly contact samples will be decontaminated prior to use. This includes drill bits, drill rods,the portion of drill rig that stands above the borehole, sampling devices, and instruments such a borehole depth sounders. In addition, care will be taken to prevent samples and sampling equipment from coming into contact with potentially contaminating substances such as fugitive dust, tape, oil, engine exhaust, corroded surfaces, dirt, or any airborne source of contamination. A temporary decontamination station shall be set up at the Site to contain decontamination water. Decontamination water will be containerized in U.S. Department of Transportation("DOT") IA2-rated drums, or equivalent. Waste handling is discussed in Section 2.5. 2.4.1 Field Equipment Decontamination The following procedures shall be used to decontaminate all large pieces of equipment, such as drill rods: 1. External surfaces of equipment shall be washed with high-pressure hot water and AlconoxTM. In some cases, more vigorous decontamination procedures, such as scrubbing, shall be required if visible material remains on the down hole drilling tools after high-pressure washing. Ripon Farm Services,Inc. 6 of 15 Sampling and Analysis Plan July 2009