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• <br />Fort Collins Soil Conservation District <br />925 John Deere Road <br />Fort Collins, CO 80529 <br /> <br /> <br />v ~ ~ <br />~ <br />h <br /> S <br />v <br /> <br />~ s o~ <br />J <br />`~ u <br />u <br />.~ <br />h u <br />~ I <br /> <br />O ~ <br />~ 1. <br />u ~ ~ <br />rn <br /> <br />3 ~ <br />l ..T <br />~ <br />u 3~ <br /> ~ <br /> ~T U <br />3 <br /> ~ O <br />~ ~ <br />h <br />~ ~ <br /> ~ s <br />~ <br />r <br />~ C+., ~ th <br /> 0 <br />~ Z R <br /> H <br />L <br />m~ 3 <br />h ~ <br />~. <br />~ ~ I <br /> D ~ <br /> V~ r <br />~ ~ <br /> a ~' r <br />' <br /> <br />~ = N h <br />RE <br />~ iii iiiiiiiiiiiuiii <br />R~C~IV~T`~ <br />DI;C 2 81992 <br />MINERALS & G O LI t$ y <br />Concerns About Holnam Boettcher Quarry Reclamation <br />Dear Sirs, <br />In your letter to Carl Mount, Division of Minerals & Geology, <br />November 30, 1992, you expressed several concerns over the <br />reclamation of the Boettcher limestone quarry. Holnam is <br />already acting upon several of those concerns, and I would <br />like to address each of them in turn. <br />Concurrent reclamation is already being done with ongoinc <br />mining activities as far as is possible. There is <br />considerable misunderstanding about what areas are <br />subject to reclamation. The south three miles of the A- <br />band cut is pre-Law, and as such, is exempt from <br />reclamation under the Mining Permit. However, Holnam is <br />engaged in reclaiming this area as possible. The Silica <br />Sludge landfill in Area Al is an example. When this is <br />completed and covered and seeded, it will comprise <br />reclamation for the south 2000 feet of the cut. The old <br />CKD dust dump has been covered and is under experimental <br />treatment with N-Viro Soil and will be seeded in the <br />spring. The rest of the cut south of the Flood Ditch is <br />being filled with CKD and upon completion of that fill, <br />will be covered, seeded and reclaimed. In 6 to 10 years, <br />when the CKD will be placed in the E-band quarry, <br />reclamation will follow the mining as closely as the CKD <br />fill progresses. It makes little sense to reclaim areas <br />which will be mined to greater depth at a later date, or <br />which will be covered with overburden piles at a later <br />date. Noxious weed control is already practiced on the <br />quarry spoil piles. Field bindweed, while not really <br />desireable vegetation, is not legally classified as a <br />noxious weed in Larimer County. <br />Flatter spoil piles definitely would have a more rapid <br />revegetation. However, the formations in this quarry dip <br />at about 16.5 degrees. In a spoil pile on the flat, at <br />the natural gradient, the toe of the pile is about 1.3 <br />times the height of the pile from the peak. If this pile <br />is put on a slope, this distance increases to about 2.25 <br />times the pile height. When a gradient of 2:1 is <br />imposed, these distances increase to 2 times, and 5.6 <br />times the height of the pile, respectively. If this w_re <br />practiced in the Boettcher quarry, which is quite narrow, <br />both because of the dipping outcrop, and the restraints <br />imposed by the irrigation ditches and property lines, <br />the practice would result in considerable unrecoverable <br />limestone. The natural slope on spoil piles is not <br />