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LFR Levine-Fricke Rew sed with a blank steel plug or a continuous core barrel soil sampler As the augers tigers are rotated into the ground, the sediments encountered in the middle of the boring are forced into the continuous core barrel sampler, and Elie sediments encountered on the outer edges of the bit and lead auger are cut and conveyed to the ground surface via the outer flights of the auger The continuous core barrel, which is connected to the ground surface by steel drill rods or cable, is extracted from the bit and lead auger whenever a new section of auger is added (tyPically every S feet) or more often depending on the soil sampling procedures and on the recovery success experienced. This drillmg method allows soil sampling and completion of the monitoring well to be conducted inside the augers while the augers allow the boring to remain open The augers are slowly removed from the borehole as the monitoring well casing, sand, bentonite, and/or grout are added from the bottom up The boring will be abandoned and sealed with a S]CPHS/EHD-approved cement/bentonite slurry. The slurry will be pumped into the boring through a tremie pipe placed in the bottom of the boring, and the boring will be filled to approxunately 1 to 2 ft bgs. The remainder of the boring will be filled with topsoil, pavement, or concrete to be consistent with site surface conditions Air-Rotary Casin&Hamrrmer Drilling The air-rotary casing-hammer(ARCH) drilling method consists of a truck-mounted drill rig turning a to-cone (Or Other type) drill bit at the end of hollow drill rods, similar to the mud-rotary drilling method. Rather than drilling mud however, compressed air is used to convey the drill cuttings to the surface The boring is kept open by a steel conductor casing advanced down the borehole in conjunction with the drill bit using a hydraulic or air-driven casing hammer mounted on the drill-rig motor The compressed air, which is used to convey the cuttings and formation fluids to the surface and keep the bit cool, is forced through filters and dryers to prevent Cross contaQmiation from oils or water generated by the air compressor_ After reaching final boring depth, the drill bit and rods are removed, and the monitoring well is constructed inside the borehole,which is held open by the steel casing The steel casing is slowly removed frorn the borehole a$ the monitoring well casing sand, bentonite, and/or grout are added from the bottom up. This drilling method will be used primarily for the installation of shallow- or deep-zone wells within soil-source primary chemical-release areas, because the conductor casing that is driven downward during drilling will minimize cross Contamination. 9.2.4 Dual Completion Well Installation and Development Dual completion, soil vapor extraction, and sparging/groundwater monitonng wells will be mstalled at the Guild Cleaners property_ The well specifications are provided in Section 5.1 of this Work Plait. After installation of wells, a licensed surveying subcontractor will survey the elevation of each well to allow for placement on base maps, W"VEGS-LWt-+v_MI23 d&Iir 02_ii:0 d 8£T009b50ZT 01 906P zS9 0TS 3NOIdA 3NIA31 dal N3 8b 9T Z0. 60 inn