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ATTACHMENT A <br />Drill hole abandonment <br />Drill holes will be drilled as a campaign, and will be cased with 3" PVC casing and capped, to <br />preserve the holes for electronic logging. Immediately on conclusion of the drilling campaign, <br />logging will be completed, and casing will be pulled. If casing cannot be pulled it will be cut off <br />and capped below ground surface. <br />Any hole producing a natural flow of water to the surface will be filled with neat cement slurry <br />from the bottom of the hole to two feet below either the reclaimed land surface or the collar of <br />the hole, whichever is the lowest elevation. Neat cement slurry shall be American Petroleum <br />Institute (API) class A or B, or ASTM C -150 Type I or II neat cement with no additives, mixed in <br />the proportion of 5.2 gallons of water per standard 94 pound sack and having a mud weight of <br />15.6 pounds per gallon. <br />Any exploration drill hole that encounters groundwater that does not flow to the surface shall be <br />sealed with a hole volume of: <br />i. A high quality sodium bentonite product specifically formulated for drill hole <br />abandonment; or <br />ii. Other appropriate approved drill hole abandonment material. <br />All drill holes will be surface capped to reduce the potential of downhole contamination from <br />the surface and to prevent injury to wildlife and domestic stock. The surface cap shall consist of <br />a non -slip hole cap placed at a point five feet below the upper surface of bedrock or seven feet <br />below the land surface whichever is the lower elevation. <br />A minimum five foot column of Portland cement or concrete cap shall be placed above the non- <br />slip plug. The top of the Portland cement or concrete cap shall be a minimum of two feet below <br />either the original land surface or the top of the casing whichever is the lower elevation. <br />The remainder of the hole shalt be backfilled with native materials and reclaimed consistent with <br />the reclamation provision of the rules. <br />Drill hole abandonment material may constitute a surface cap where abandonment materials <br />remain at or close to the surface and is compatible with local cultivation practices. <br />Void space between the top of the cap and the land surface shall be backfilled with native <br />materials and reclaimed consistent with the reclamation provision of these rules. <br />