Laserfiche WebLink
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 ad'acent to the <br /> contaminated aquifer and pressed or advanced slightly into the <br /> underlying aquatard. 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 an 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 pales, 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 as advanced into the soil with a slide hammer. In <br /> other cases, the outer surface of the soil as 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 as 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 />