ENFORCE36205

• 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

The log indicates that 350-ms delays were used downhole. The permit states that
600-ms delays will be used downhole.
My reconstruction of the blast from the blast log and the blast sketch indicates
that there were 44 instances where two or more holes were detonated
within 8 milliseconds or less of each other. The permit states that blast
holes will have a 9-ms delay between each of them.
Rule 4.08.5(11) requires blast logs to have a record of the maximum weight of
explosives detonated within any 8-ms interval during the blast. My
reconstruction of the blast indicates that the maximum weight of
explosives detonated within any 8-ms interval during Blast #104-02 was
712 lbs/8 ms interval. The log indicates that the maximum weight of
explosives detonated within any 8-ms interval was 925 lbs/8 ms. This
indicates an incorrect use of the weighUdistance formula of Rule
4.08.4(10)(c)(i).
The distance between the blast and the Primero School was recorded on the log as
5300 feet; information provided later indicated the distance was 4300 feet,
contradicting the information on the log. Failing to properly identify the
distance between the blast and the school is a violation of Rule 4.08.5(4).
The number ofpersons in the blast crew is not recorded on the blast log, as
required by Rule 4.08.5(16).
A calibration signal of the seismograph's gain setting, or a certification of annual
seismograph calibration, was not available, as required by Rule
4.08.5(17)(a).
Blast 105-02:
The log and the blast sketch indicate that 272 holes were detonated. The permit
states that the maximum will be 72.
The log indicates that the blast holes were 12 feet deep. The permit states that the
blast holes would be at least 30 feet deep.
The log indicates that the blast holes were drilled on a ] Z' X 12' pattem. The
permit states that the blast holes will be drilled on a 16' X 18' pattem.
The log indicates that explosive material was placed in the blast holes to within 6
feet of the surface. The permit states that explosive material will be
placed no closer than 10 feet from the surface.
The log indicates that the blast was initiated with an electric initiation system.
The permit states that initiation will bewith anon-electric system.
The log and blast sketch indicate that 25-ms surface delays were used along rows.
The permit states that 9-ms surface delays will be used along rows.
The log indicates that 42-ms delays were used somewhere in the pattern, but the
blast sketch does not identify their location. The permit states that 100-ms
surface delays will be used between rows.
The log indicates that 350-ms delays were used downhole. The permit states that
600-ms will be used downhole.
My reconstruction of the blast from the blast log and the blast sketch indicates