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Compliance & Closure, Inc. <br /> Soil Sampling Protocol <br /> • Latest Revision: March 1998 <br /> 8) When drilling through an aquifer known to be contaminated, a staged <br /> drilling approach will be used. This would involve using either <br /> a temporary or permanent conductor casing placed adjacent to the <br /> contaminated aquifer and pressed or advanced slightly into the <br /> underlying aquitard. The cased hole will be cleaned as necessary, <br /> following which, a smaller diameter drill bit/auger will be <br /> advanced to the next underlying water bearing stratum. An <br /> impermeable seal will be placed in the borehole <br /> or annular space as appropriate upon completion of exploratory <br /> boring/well construction. <br /> II. SOIL SAMPLING BY HAND <br /> 1) Some situations require that samples be collected by hand without <br /> the assistance of a drill rig (e g , soil stock piles, excavation <br /> sidewall sampling, etc ) . When possible, soil samples will be <br /> collected using a steel core sampler, equipped with clean brass <br /> liners, which is advanced into the soil with a slide hammer_ In <br /> other cases, the outer surface of the soil is removed and a brass <br /> liner is driven into the soil by hand or with a hammer. To avoid <br /> damaging the liner, a block of wood can be held next to the liner <br /> so that the hammer strikes the block rather than the liner. The <br /> liner is removed and handled as described above In deep <br /> excavations where safety factors preclude the direct sampling of <br /> the bottom or side wall, soil is retrieved by a backhoe bucket and <br /> this soil is sampled <br /> • <br />