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' f <br />i <br />I <br />r? <br />I <br />i <br />I <br />i - <br />I <br />EXHIBIT A <br />SURFACE <br />FILL <br /> 1 <br /> PERMAPLUG <br /> 1. , Hole plugging - When water is used in conjunction <br />_ iwith the drilling of seismic shot holes and artesian <br /> _ flow is not encountered at the surface; seismic holes <br /> _ am to be filled with a high grade bentonite/water <br />:- slurry mixture. The slurry shall have a density that <br />-' <br />' is at least four percent (4%) greater than the density <br />- of fresh water; the slurry shall also have a marsh <br /> 9ENT0NITEIWATER <br />SLURRY MIXTURE funnel viscosity of at least sixty (60) seconds-per <br />quart The hole will be filled with the sl <br /> urry to a <br />depth of three (3) feet below ground level. A nonce <br /> metallic permaplug will be set at three (3) feet below <br /> ground level and the remaining hole will be filled and <br /> burped to the surface with cuttings and native soil. <br /> Z When drilling with air only, and in completely dry <br /> boles, plugging may be accomplished by returning the <br /> cuttings to the hole and tamping the returned cuttings <br /> to a depth of three (3) feet A permapfug will be set at <br />• 3 feet and topped with more cuttings and soil as described <br /> above. A small mound will be left over the hole for <br />" settling allowance, _ <br />-' 3. The site around the hole must be cleaned up and surplus <br /> mittings leveled. Seeding of the disturbed area may be <br /> required. <br />ABANDONMENT OF SHALLOW DRILL HOLES <br />NO WATER OR COAL ZONES DRILLED THROUGH OR INTO <br />