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• Abandonment and sealing will involve digging a small slit trench alongside each <br />cased hole/well with a backhoe to provide subsurface access to the casing. The casing <br />will be then be cut off approximately 3 feet below ground level and a mixed, high <br />yield bentonite slurry will be placed down the open hole/well until the hole/casing is <br />filled to within approximately 10 feet of the top of the hole. (The bentonite slurry <br />continues to yield and swell in the hole/well wherever water is contacted, whereas <br />cement slurries have the potential to contract and crack over time). A cement slurry <br />plug will be placed into the hole/casing extending from the bottom of the slit trench <br />filling the remainder of the hole/well. Before placing the cement slurry, a non -slip <br />plug or equivalent will be installed in the hole/casing at the top of the bentonite slurry <br />to assure that the cement plug does not settle into the bentonite slurry. <br />• Backfill the slit trench with suitable material and regrade the associated surface area. <br />• Install 3/4 inch diameter steel pipe hole marker. or equivalent. <br />• Broadcast approved seed mixture on associated disturbance areas. <br />Appropriate abandonment and reclamation reports, utilizing all available information, will be <br />filed with the Division, and, where applicable, the Colorado Division of Water Resources for <br />all holes that are EFCI's reclamation responsibility. <br />2.05.4-31 Revised 10/28/1 <br />MR -69 <br />