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.; <br />GLENN E. MILLER, CONSULTING GEOLOGIST <br />748 STARLING IANE ~ ELIZABETH, COLORADO 80107 ~ (303) 646-3718 <br />~, , <br />:) it ~i:1:1:~ <br />L'ebruary 2, 1993 ,_ ~ ~} ; ~. <br />s~ t_ <br />Mr. MarJc Kerr <br />Landmark Reclamation <br />4901 S. Windermere <br />Littleton, CO 80120 <br />RE: Sealing of holes 93-1A & 93-2A <br />Dear Mark, <br />At your request, I am providing you with the abandonrtwnt <br />(sealing) information for holes 93-1A and 93-2A which we recently <br />completed. <br />Site 93-1A was drilled to a depth of 97 feet and did not <br />encounter water. Upon drill completion, we shoveled drill cuttinys <br />back into the drill hole backfilling the hole to 10 feet. We then <br />placed a non-slip plug in the drill hole at lU feet and left the drill <br />site to be plugged with cernent by your crew at Rimrock. The diameter <br />of the drill hole was 6 1/4". <br />Site 93-2A was drilled to a depth of 122 feet. Surface casing <br />(6") was set to 63 feet in a 8 3/4" diameter hole. The remainder of <br />the hole was drilled at a 5 7/8" diameter to the TD of 122 feet. No <br />water was encountered but a combination of 2 sacks (40 lb) of <br />bentonite was used with drill cuttings to backfill the hole to 10 <br />feet. A non-slip plug was set at 10 feet and the hole was left to be <br />plugged with cement by your Rimrock crew. <br />Upon completion of the last drill site, I talked with Jack at the <br />mine and indicated that a standard hole plug above *_he non-slip bole <br />plug would consist of 1/2 to 1 sack of cement mixed with 5 to 10 <br />gallons of water. Drill cuttings could be supplemented with the <br />cement and the mixture poured into the hole. The remaining hole <br />voliune (2-3 feet) should be shoveled flush to the surface with any <br />available drill cuttinys and soils. <br /> <br />Glenn E. Miller <br />Consulting Geologist <br />