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�J Summary oil Drilling Methods & 'Tectiunques or Installing CNfT wells in Unconsolidated Aquifers Page 2 of " <br /> 1 borehole. Prevents in borehole. A casing removed. <br /> - redistribution of alternating lifts ..r <br /> contaminants along sand and bentonite <br /> ® borehole well during pelletal as casing is <br /> fl%�y�Jl drilling. withdrawn, either by <br /> gravity placement, <br /> tremie methods or <br /> using the Solinst <br /> Sand Bentonite <br /> F<c Injector. <br /> _ Mud rotary Widely available. Place CMT tubing Thin drilling fluid as <br /> I�� � I directly into borehole much as possible <br /> J with anchor plate prior to installing <br /> attached to bottom of annular materials. <br /> tubing. CMT tubing Use a coarse-grained <br /> - r, centralizers should be filter pack. Mud filter <br /> used to center CMT cake can be difficult <br /> _ tubing in borehole, to remove with <br /> Place sand pack and development <br /> bentonite with a methods available for <br /> trends tubeandgroutCMT wells. <br /> pump. <br /> 1 Coated bentonite pellets do not hydrate as quicW, therefore these <br /> pellets are useful for deeper applications, however some coated <br /> pellets give off either ethanol or acetone, and can cause elevated <br /> -- - detection limits of some target compounds. Typically, uncoated <br /> pellets are suitable for depths up to 100 it of water. <br /> I Home Products I About Contact Us Papers Downloads Tradeshows Rentals Links Espanol I NEWS Shaman <br /> LJ <br /> I <br /> I <br /> _ I <br /> I i —II_ <br /> J <br /> '_,I <br /> I_ http://www.solimt.com/Prod/401/403addon/403SOPlfmi 4/5/02 <br />