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2005-01-31_REVISION - M1977208 (2)
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2005-01-31_REVISION - M1977208 (2)
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Last modified
6/16/2021 6:23:48 PM
Creation date
11/21/2007 11:10:25 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977208
IBM Index Class Name
Revision
Doc Date
1/31/2005
Doc Name
Withdraw TR05 and incorporate into TR04
From
CEMEX Inc
To
DMG
Type & Sequence
TR5
Media Type
D
Archive
No
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~~cmcx <br />~$~Gs~.e~i''_''~ <br />Erica Crosby January 27, 2005 <br />Environmental Protection Specialist JAN 3 i 2(;^~ <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 QieisE::; cf r.:[~.~a;n u, d~ohgq <br />Denver, Colorado 80203 <br />RE: Response to Adequacy Letters (dated November 22 and December 17, 2004), <br />CEMEX, Inc., Lyons Quarry, Permit No. M-1977-208, TR-04 and T~_`~ <br />Dear Erica: <br />This letter contains Cemex's response to the adequacy letters for the above referenced Technical <br />Revisions. Cemex requests that TR-OS be withdrawn and combined into TR-04. There is <br />obvious overlap and interrelationship between the two Technical Revisions and combining the <br />two provides for a clearer response. All of the material submitted in TR-OS is hereby included in <br />TR-04. <br />This letter is outlined as follows: <br />• Discussion of Cemex's position on the hydrogeologic setting and computer model results <br />• Cemex's proposal for monitoring and control of C-pit water <br />• Point by point response to the Division's two adequacy letters (included as Attachment 2) <br />H~geologic Setting and Modeling Results <br />During a meeting with the Division on December 17, 2004, Cemex provided a summary of the <br />hydrogeologic setting of C-Pit and the contaminant transport modeling results. The presentation <br />was made using Attachment 1 which shows a hydrogeologic cross-section through C-Pit and the <br />underlying formations, including the Dakota sandstone. Attachment 1 also shows the regional <br />groundwater flow direction and results of the transport model performed by URS Corporation on <br />behalf of Cemex. <br />Attachment 1 indicates that C-Pit is excavated in the low permeability Smoky Hill shale and Fort <br />Hays limestone members of the Niobrara Formation. C-Pit is underlain by approximately 650 <br />feet of a low permeability, heterogeneous sequence.of claystones, siltstones, shales, and <br />limestones of the Cretaceous Carlile shale, Greenhorn limestone, Graneros shale, and Mowry <br />shale. All of these formations dip approximately 6° to 15° east-southeast. Groundwater flow <br />within the units is primarily horizontal along the bedding and parting planes of the strata, <br />although vertical flow is possible, but less significant, along the fractures. <br />The Dakota group, comprised of siltstones, sandstones, and shales underlies the Mowry shale. <br />Regional groundwater flow n the Dakota, as well as the overlying formations, is to the east- <br />southeast. The first sandstone member of the Dakota group is an artesian aquifer that locally <br />supplies groundwater. In 1999, the artesian conditions caused groundwater to flow freely a[ the <br />surface from the well completed in the first sandstone member on the Hall property adjacent to <br />the southeastern Cemex property boundary. These artesian pressures would likely limit <br />United Sates Operations <br />P.O. Box 529, Lyons, Colorado 80540, USA, Phone: (303) 8232100, Faz: (303) 8232199 <br />
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