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permanent conductor casing placed adjacent to the contaminated aquifer and <br /> pressed or advanced slightly into the underlying aquitard. The cased hole will <br /> be cleaned as necessary, following which, a smaller diameter drill bit/auger <br /> will be advanced to the next underlying water bearing stratum. An <br /> ' impermeable seal will be placed in the borehole or annular space as <br /> appropriate upon completion of exploratory boring/well construction. <br /> ,I II. SOIL SAMPLING BY HAND <br /> ' 1) Some situations require that samples be collected by hand without the <br /> assistance of a drill rig (e.g., soil stock piles, excavation sidewall sampling, <br /> etc.). When possible, soil samples will be collected using a steel core sampler <br /> ' equipped with clean brass liners which is advanced into the soil with a slide <br /> hammer. In 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 damaging <br /> 1 the liner, a block of wood can be held next to the liner so that the hammer <br /> strikes the block rather than the liner. The liner is removed and handled as <br /> ' described above. In deep excavations where safety factors preclude the direct <br /> sampling of the bottom or side wall, soil is retrieved by a backhoe bucket and <br /> this soil is sampled. <br /> ' RESNA INDUSTRIES, INC. <br /> Soil Sampling Protocol <br /> Latest Revision: October 23, 1991 <br /> f <br />