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K PAWAWALANIM <br /> ---MNU <br /> FIELD PROCEDURES Working to Restore Nature <br /> Site Safety_Plan <br /> The site safety plan describes the basic safety requirements for the drilling of soil borings <br /> at the work site. The safety plan is applicable to personnel of RESNA and to <br /> subcontractors of RESNA. The representative from RESNA acts as the Site Safety Officer <br /> Personnel at the site are informed of the contents of the site safety plan before work began <br /> A copy of the plan is kept at the work site and is available for reference by appropriate <br /> parties during the work <br /> Drilling and Soil Sampling <br /> Before drilling, soil borings are started by hand-augering to a depth of approximately-5 feet <br /> to reduce the risk of damaging underground structures The soil borings are drilled using <br /> a truck-mounted drill rig equipped with 10-inch-diameter, continuous-flight, hollow-stem <br /> augers The drilling is performed under the guidance of a field geologist Relatively <br /> undisturbed soil samples are collected from each boring at 5-foot intervals or other <br /> appropriate intervals from the ground surface to the total boring depth, identified using <br /> visual and manual methods, and classified according to the Unified Soil Classification <br /> System <br /> Soil samples are collected using a California-modified, split-spoon sampler equipped with <br /> clean brass sleeves Samples are collected by drilling the boring to a point just above the <br /> sampling depth and then driving the sampler into the soil through the hollow center of the <br /> auger The split-spoon sampler is driven 18 inches with a standard 140-pound hammer <br /> dropped 30 inches The number of blows required to drive the sampler each successive 5- <br /> inch interval is counted and recorded on the field boring log to give an indication of soil <br /> consistency. <br /> Soil samples are evaluated for relative levels of hydrocarbons using a photoionization <br /> detector (PID) Field instruments such as the PID provide a preliminary assessment of the <br /> total volatile constituents and cannot identify or distinguish between individual compounds. <br /> The PID may also be affected by moisture, fluctuations in the air and/or soil temperature, <br /> and the specific soil type Subjective evidence of hydrocarbons such as soil discoloration or <br /> obvious odor are rioted <br /> 0913ccar <br /> M98-10 <br />