2008-08-25_REVISION - M1980244 ‎(3)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 8/25/2008
• Doc Name: PAR-Fax
• From: DRMS
• To: CC&V
• Type & Sequence: AM9
• Email Name: BMK
• Media Type: D
• Archive: No

b) The distance input factor for the scaled distance equation will be horizontal
distance from location of any blast to the nearest man made structure not owned
or controlled by CC&V. Such structures shall include the underground workings
of the Molly Kathleen tourist mine.
c) Peak particle velocity (ppv) caused by blasting vibration measured at any of the
monitoring locations approved by the DRMS in excess of 0.5 inches per
second(ips) must be reported to the DRMS. If measurements from any two
blasting events exceed 0.5 ips, CC&V will investigate and report the results to the
DRMS. The Division will review the results and recommend further actions as
needed.
d) In order to be consistent with previously approved revisions for the Cresson
Project, CC&V will prepare blast reports as follows for each shot. The reports must
be retained by CC&V for at least three years and must be available for inspection
by the Division upon request.
1. Location, date and time of blast.
2. Name, signature, and license number of blaster - in charge.
3. Identification, direction and distance, in feet, from the nearest blast hole to
the nearest potentially affected structures not owned or controlled by CC&V.
4. Type of material blasted.
5. Sketches of the blast pattern including number of holes, burden, spacing and
delay pattern. Sketches shall also show decking, if holes, are decked to
achieve different delay times within a hole;
6. Diameter and depth of hole;
7. Types of explosives used;
8. Total weight of explosives used per hole and maximum weight of explosives
used per 8-millisecond period:
9. Initiation system;
10. Type and length of stemming;
11. Mats or other protections used;
12. Type of delay detonator and delay periods used;
13. Number of persons in the blasting crew; and
14. Seismographic records as approved in AM-08.
e) CC&V will conduct pre-blast survey of potentially affected structures not owned
or controlled by CC&V that have not previously been surveyed, with survey
results on file with DRMS. Pre-blast surveys must be conducted at all structures
located within one-half mile of the proposed blasting unless persons in ownership
or control deny access to the structures. Written request to conduct pre-blast
surveys must be sent to owners of all structures a minimum of 30-days prior to
initiation of blasting within one-half mile. CC&V must provide a plan for DRMS
review and approval prior to conducting the surveys.
f) CC&V proposes the installation of at least one additional seismograph, in addition
to those already approved under AM-08, for monitoring of potential impacts to
structures in Cripple Creek. The Division will require that the location for the new
seismograph(s) be established prior to a decision on AM-09, and that the location
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