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REV90127
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REV90127
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Entry Properties
Last modified
8/25/2016 3:11:54 AM
Creation date
11/21/2007 10:59:56 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
Revision
Doc Date
5/17/1996
Doc Name
CRESSON PROJECT PN M-80-244 PROCEDURES & MATERIALS FOR 1996 CONSTRUCTION REMOVAL OF DRAING COVER
From
CRIPPLE CREEK & VICTOR GOLD MINING CO
To
DMG
Type & Sequence
TR20
Media Type
D
Archive
No
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judge the height of the blade and allow the dozer operator to use this marker, along with the <br />previously-placed DCF, to guide the blade height. At times when liner wrinkles must be <br />specially handled by the laborer, the marker will be kept upright for dozer operator observation <br />while the laborer shovels material azound the wrinkle or takes other measures to prevent creasing <br />of the liner. <br />CC&V is requiring the placement of DCF which is conducted during hours of normal darkness <br />(i.e., "night") to be conducted with adequate lighting such that all tube mazkers, laborers, and <br />CQA personnel aze clearly seen by the dozer operator. In order to cleazly impose this <br />requirement, CC&V has specified a minimum illumination candle power level for lights of 3 foot <br />candles (on the synthetic liner). This criterion supplements judgement as to whether adequate <br />lighting is present. If DCF is to be placed in any area of exposed liner where there is <br />inadequate light according to this criterion, placement will be halted until adequate light is <br />provided. <br />CC&V is planning on 5-day work weeks for the DCF contractor and two shifts per day, with <br />Saturday as bad weather makeup days. This will ensure that the personnel placing and <br />monitoring the DCF placement are not overworked to the point of exhibiting inattention to the <br />tasks at hand. <br />Upon placement of the DCF with the dozers, the final grade, which is designed to be the closest <br />to the two-foot minimum thickness, will be achieved using either slow-ground-pressure dozer <br />or a motor grader, or both. <br />The Golder CQA representative will be in communication with the dozer operator by radio such <br />that any commands necessary to control the height of the blade will be rapidly received by the <br />dozer operator. <br />The Phase II area has a more consistent final topography (that is, fewer changes in grade) than <br />the Phase I area. This means that the potential to encounter an area of higher elevation in a <br />short distance is reduced. Therefore, the potential to encounter the liner with the dozer blade <br />due to "losing one's point of reference" is reduced. <br />It is also noted that in the area of the Pregnant Liner System ("PLS"), that portion of the Phase <br />II pad of the Low Volume Solution Collection System, CC&V is using a heavier liner, 100 mil <br />(thick). This thickness of material was selected to eliminate the use of geotextile in the area of <br />the Low Volume Solution Collection System. This improves the puncture resistance of the <br />underlaying synthetic liner in the PLS part of the Phase II area. <br />CC&V, through its design engineer, Golder Associates, has performed quantitative analytical <br />assessments of the static and dynamic stresses that might be imparted to the synthetic liner <br />through the DCF to determine that pressures and strains, as well as interface sheaz resistance <br />and overall stability of the DCF during placement will not be compromised. These assessments, <br />which have been submitted in CC&V preceding correspondence (January 9, Mazch 4, and April <br />24), include the following: <br />3 <br />
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