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ENFORCE27898
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ENFORCE27898
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Entry Properties
Last modified
8/24/2016 7:35:21 PM
Creation date
11/21/2007 11:46:05 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Enforcement
Doc Date
12/10/1992
Doc Name
COLOWYO COAL MINE C-81-019 MR-22 REVISION OF BLASTING SKETCHES TDN X-92-02-0244-2 TV-2
From
DMG
To
COLOWYO COAL CO
Violation No.
TD1992020244002TV2
Media Type
D
Archive
No
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.. y~ r z <br />2. It appears from the sketch that there are no delays being used and that all holes aze <br />fining at once. The value for number of holes per delay given in the text (140) would <br />then also not agree with the maximum number of holes as described by the sketch (255). <br />Please verify. <br />3. The value given in the text for pounds of explosives per delay (1,920) does not agree <br />with the value calculated by the Division given the number of holes per delay shown by <br />the sketch (255 x 14 = 3,570). Please verify the maximum amount of explosives fired <br />for any 8 ms delay. <br />4. Values given in the text for maximum weight of explosives used per 8 ms delay period <br />and for maximum number of holes per 8 ms period also appeaz to be in error. The <br />Division is uncleaz, in any case, as to how Colowyo arrived at a value of 182 for <br />maximum weight of explosives used per 8 ms delay period or 13 for the maximum <br />number of holes per 8 ms period. Please verify. <br />6. The value given for total weight of explosives used may also be in error. Please verify <br />the total weight of explosives used. <br />In order for the Division to complete its review of MR-22, please: <br />1. Explain or correct the inadequacies noted above. <br />2. Submit the other side of the blasting report for the 11-24-92, overburden blast. <br />3. Please include a calculation for determ;n;ng pounds of explosives per hole. This <br />calculation, including information on the density of the explosives used, is needed by the <br />Division in verifying pounds of explosives used per delay period. <br />Changes to Fill InsRection Plans: <br />The submittal by Colowyo on November 18, 1992, revising pages Ia-4 and IIa-4, answers the <br />Division's adequary concerns. <br />Thank you for your help. Should you require anything, please contact me at my office. <br />Sincer'ely/, <br />Stephen F. Wathen <br />Reclamation Specialist <br />cc: Larry P. Routten, DMG <br />
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