REV104535

• Permit No: C1981010
• IBM Index Class Name: Revision
• Doc Date: 8/29/2002
• Doc Name: Adequacy letter
• From: DMG
• To: Trapper Mining Inc
• Type & Sequence: RN4
• Media Type: D
• Archive: No

Rule 2.05.3(6)(a)(vii), the following sentences are suggested as replacements for the existing
sentences cited above:
"Blasting will be conducted in such a manner as to ensure compliance
with the ground vibration limits set forth in Rule 4.08.4(10). Blasting
will be conducted in accordance with the following equation:
W = (D/Ds)Z, where
W =the maximum weight of explosives, in pounds, that can be
detonated in any 8-millisecond period during a blast or during
two or more simultaneous blasts;
D =the distance, in feet, from the closest blast hole to the neazest
dwelling, public building, school, church, or community or
institutional building;
DS = ttte scaled-distance factor, using the following values as
described in Rule 4.08.4(10):
50 =when the distance from the closest blast hole to the
neazest dwelling, public building, school, church, or
community or institutional building is 0 to 300 feet;
55 =when the distance from the closest blast hole to the
neazest dwelling, public building, school, church, or
community or institutional building is 301 to 5000 feet;
65 =when the distance from the closest blast hole to the
neazest dwelling, public building, school, church, or
community or institutional building is 5001 feet or greater.
Rule 4.08.4(6)(c) requires periodic airblast monitoring to demonstrate compliance with the
airblast limits of 4.08.4(6)(a). These airblast compliance limits vary, depending on the lower
frequency range of the airblast monitoring equipment being used.
(a) In accordance with Rule 2.05.3(6)(a)(iv), please update the TMI pernvt with descriptions
of the type, capability, sensitivity, and location of all blast monitoring equipment that
TMI intends to use. Please be aware that Rule 4.08.4(6)(c) requires airblast monitoring
equipment to have anupper-end flat-frequency response of at least 200 Hz.
(b) In accordance with Rule 2.05.3(b)(a)(vii), please update the TMI permit with a
description of the applicable airblast compliance limit(s) from Rule 4.08.4(6)(a} that TMI
intends to comply with.
(c) In accordance with Rule 2.05.3(6)(a)(iv), please update the TMI permit with a description
of the procedures that TMI intends to follow when using this blast monitoring equipment,
including the frequency (every blast, every overburden blast, etc) of use, the location of
C-1981-010 RN04/PROS 4 08/29/02