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GENESIS ENGINEERING&REDEVELOPMENT • Drilling method • Depth at which saturated conditions are first encountered • Occurrence of waste materials, contamination, staining, and/or odors • Sample depths • Zones of caving or heaving 0 Drilling rig reactions such as chattering, rod drops, and bouncing • Refusal 2.3 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") rated drums, or equivalent. Waste handling is discussed in Section 2.4. 2.3.1 Field Equipment Decontamination The following procedures will be used to decontaminate all large pieces of equipment, such as drill rods: 1. External surfaces of equipment will be washed with high-pressure hot water and AlconoxTM. In some cases,more vigorous decontamination procedures, such as scrubbing, will be required if visible material remains on the downhole drilling tools after high-pressure washing. 2. Equipment will be thoroughly rinsed with potable water. This decontamination procedure will be performed before equipment is used and between each boring location. 3. Decontamination solutions will be accumulated and containerized in U.S. DOT rated drums, or equivalent, for further characterization and disposal. William DePaoli Property 4 of 15 Sampling and Analysis Plan June 2009