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ENFORCE36205
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Entry Properties
Last modified
8/24/2016 7:45:37 PM
Creation date
11/21/2007 2:58:38 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996084
IBM Index Class Name
Enforcement
Doc Date
6/17/2002
Doc Name
Notice of Violation
From
DMG
To
Lorencito Coal Company
Violation No.
CV2002009
Media Type
D
Archive
No
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NOV attachment <br />Blast 103-02: <br />The log and blast sketch indicate that 82 holes were detonated. The permit states <br />that the maximum will be 72. <br />The log indicates that the blast holes were 24 feet deep. The permit states that the <br />blast holes would be at least 30 feet deep. <br />The log indicates that the blast was initiated with an electric initiation system. <br />The permit states that initiation will be with anon-electric system. <br />The log and blast sketch indicate that 17-ms surface delays were used along <br />rows. The permit states that 9-ms surface delays will be used along rows. <br />The log and blast sketch indicate that 42-ms and 67-ms delays were used between <br />rows. The permit states that 100-ms surface delays will be used between <br />rows. <br />The log indicates that 350-ms downhole delays were used. The permit requires <br />downhole delays to be 600 ms. <br />My reconstruction of the blast from the blast log and blast sketch indicates that <br />there were 49 instances during this blast where two or more holes <br />detonated within 8 milliseconds or less of each other. The permit states <br />that blast holes will have a 9-ms delay between each of them. <br />The maximum weight of explosives used per 8-ms interval is not recorded on the <br />log, as required by Rule 4.08.5(11). <br />The number of persons in the blast crew is not recorded on the blast log, as <br />required by Rule 4.08.5(16). <br />A calibration signal of the seismograph's gain setting, or a certification of annual <br />seismograph calibration, was not available, as required by Rule <br />4.08.5(17)(a). <br />A record of the airblast level was not recorded on the log, was required by Rule <br />4.08.5(17)(e). <br />Blast 104-02: <br />The log indicates that the blast holes were 22 feet deep. The permit states that the <br />blast holes would be at least 30 feet deep. <br />The log indicates that explosive material was placed in blast holes to within 6 feet <br />of the surface. The permit states that explosive material would be placed <br />in blast holes no closer than 10 feet from the surface. <br />The log indicates that the blast was initiated with an electric initiation system. <br />The permit states that initiation will be with anon-electric initiation <br />system. <br />The log and blast sketch indicate that 17-ms surface delays were used along rows. <br />The permit states that 9-ms surface delays will be used along rows. <br />The log and blast sketch indicate that 42-ms surface delays were used between <br />rows. The permit states that 100-ms surface delays will be used along <br />rows. <br />
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