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2018-08-07_REVISION - M1988108
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2018-08-07_REVISION - M1988108
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Entry Properties
Last modified
6/16/2021 5:54:22 PM
Creation date
8/7/2018 2:46:48 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1988108
IBM Index Class Name
REVISION
Doc Date
8/7/2018
Doc Name
Request for Technical Revision
From
TRNLWB, LLC
To
DRMS
Type & Sequence
TR1
Email Name
ECS
MAC
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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N PF TRNLWB, LLC <br /> July 30, 2018 <br /> Mr.Michael Cunningham <br /> Division of Reclamation,Mining and Safety <br /> State of Colorado <br /> 1313 Sherman St.,Room 215 <br /> Denver,CO 80203 <br /> RE: Inspection Report Response/Technical Revision <br /> Permit Number: M-1988-108 <br /> Trinity ESC—Boulder, CO <br /> Dear Mr. Cunningham: <br /> TRNLWB, LLC has received the Colorado Division of Reclamation, Mining and Safety <br /> (Division) Inspection Report dated March 30,2018. The inspection report(included as Appendix <br /> A) identified four problems/possible violations and outlined the necessary corrective action for <br /> each item of interest. Additional instructions were provided by the Division via email to <br /> TRNLWB. As a Technical Revision, the items are presented below (in bold), along with <br /> TRNLWB's response. <br /> The Operator is placing solid waste from the processing plant on the mine slopes <br /> instead of disposing of the material in stowage chambers as approved in the Mining <br /> Plan.This is a problem pursuant to C.R.S. 34-32.5-112 (1)(c)(Vn for failure to follow <br /> the Mining Plan. <br /> Upon a detailed review of the files, TRNLWB concurs that the current placement of the solid <br /> waste is not consistent with the horizontal placement of the solid waste detailed in the mining <br /> plan. Sometime since 1988, the methodology for placement of the solid waste material changed <br /> from horizontal lifts of the solid waste material to placing the material along the contours of the <br /> sidewalls of the pit that is currently under reclamation and a dozer pushes the solid waste material <br /> over the edge of the mine allowing the material to slope down the side of the pit. <br /> Based on discussions with the Division and good engineering principles,TRNLWB performed an <br /> analysis of a portion of the solid waste stream that is being disposed in the previously mined <br /> areas. Stockpiled overburden and the consolidated waste material described herein will be and is <br /> currently being used for reclamation to establish a final grade of no steeper than 3H to 1 V from 5 <br /> feet above and 10 feet above a post-reclamation 10-acre pond within the current existing quarry <br /> area. There are three distinct materials that make up the solid waste that is used to reclaim the <br /> mined out portions of the pit. The first waste material is comprised of the fines from the Pierre <br /> shale mining and crushing operation. These fines are natural shale material that is removed after <br /> crushing and screening and well before entry into the kiln. The second solid waste is the material <br /> that is captured in the baghouse. This material is the particulates that are screened out of the <br /> exhaust stream prior to entry into the scrubber tower. These particulates will be primarily <br /> comprised of raw shale, calcined shale, and lightweight aggregate that are caught up in the air <br />
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