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_GENERAL DOCUMENTS - C1981017 (237)
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_GENERAL DOCUMENTS - C1981017 (237)
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Last modified
11/2/2020 10:20:46 AM
Creation date
6/20/2012 1:59:35 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981017
IBM Index Class Name
GENERAL DOCUMENTS
Doc Name
Bid Documents (IMP) TR-18 Correspondence
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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BRUCE A. COLLINS, PH.D. ReceiveCONSULTING GEOLOGIST 40 <br /> 1 398 4060 ROAD Dfii A <br /> PAONIA COLORADO 81 428f� `� <br /> (303)527-4073 // <br /> Pt Of <br /> MID-CONTINENT RESOURCES , INC. urcasJ <br /> REQUEST TO SUSPEND SUBSIDENCE MONITORING PROGRPM <br /> On January 26 , 1981 , Mid-Continent Resources, Inc. (here- <br /> inafter referred to as MCR) submitted a Yining and Reclam- <br /> ation Plan for its Coal Basin operations to the Colorado <br /> Mined Land Reclamation Division (hereinafter referred to <br /> as CMLRD) for review and approval . In response to the <br /> requirements of Rule 2 . 05 . 6 , Subsidence Survey, Subsidence <br /> Monitoring and Subsidence Control Plan, MCR basically <br /> stated that, because of the great overburden depths present <br /> over most of the permit area and the absence of structures <br /> or renewable resource lands, there was little likelihood <br /> of significant subsidence taking place, and if it did no <br /> damage would occur. CMLRD, in its review process, rejected <br /> this argument, and after several additional submissions <br /> and revisions, an acceptable subsidence survey and monitor- <br /> ing plan was approved, along with the rest of the Mining <br /> and Reclamation Plan, effective May 31, 1983 . <br /> The subsidence section of the permit application as revised <br /> and approved (Vol . 7 , Chapter IV, pages 23-34) , contains <br /> the following salient points : <br /> 1. Renewable resource lands. These consist of limited <br /> grazing areas for livestock and wildlife and possible <br /> aquifer recharge areas. The minimal value of timber in the <br /> area is supported by correspondence with the U.S . Forest <br /> Service dated 9/5/80 , 9/16/80 , and 10/14/80 . There are no <br /> known threatened or endangered species in the area, and it <br /> is too high to provide winter range for big game animals <br /> (USFS , 9/16/80) . Known aquifers in the area are below the <br /> Rollins Sandstone and will not be affected by subsidence. <br /> All of the known sandstones in the coal-bearing sequence, <br /> including the Rollins which forms its base, are tightly <br /> cemented by a mixture of calcite and silica, and commonly <br /> have a clay matrix. While there are no hard numbers avail- <br /> able, experience in nearly 30 years of mining indicates that <br /> porosity, permiability and transmissivity of these units are <br /> all low. Even on the lower slopes, at the extreme margins <br /> of the permit area on the western side of the basin, bedrock <br /> in the stream valleys draining the area is shallow, and in <br /> addition only the lowermost reaches of Henderson, Coal and <br /> Spring Creeks within the permit boundaries are shown by the <br /> U.S . Geological Survey to be perennial streams (Placita and <br /> Elk Knob 7 . 5 ' quadrangle maps) . It is therefore unlikely <br /> that recharge to alluvial materials in these valleys within <br /> the permit area is significant. <br />
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