2008-04-15_REVISION - M1980244 ‎(336)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 4/15/2008
• Doc Name: Teller County Vol.1, Attachment 8, Noise Analysis Report
• From: CC&V
• To: DRMS
• Type & Sequence: AM9
• Media Type: D
• Archive: No

dwif.,-7)e to noted
1. INTRODUCTION
A. DESCRIPTION OF OPERATIONS
Cripple Creek & Victor Gold Mining Company (CC&V) is finalizing a feasibility study for a potential Mine
Life Extension (MLE) project associated with the existing Cresson Project. The reserve additions within
the Cripple Creek Mining District suggests an opportunity to extend the current mine life of the project
from 2012 until about 2016 with processing to continue until approximately 2024.
The proposed MLE mining operations will be a continuation of the current mining methods being
employed. The operations will be closer to the City of Cripple Creek and the town of Goldfield; therefore
closer to occupied residences or public accessible buildings. The mining operations would involve the
following noise sources.
¦ Stripping and stock piling of growth medium and overburden using dozers, front end loaders, motor
graders and haul trucks.
¦ Drilling and loading of blast holes using rock drills and service vehicles
¦ Loading of fractured rock using front end loaders, shovels and haul trucks.
¦ Routine mine surface preparation and maintenance using dozers and motor graders.
¦ Mine reclamation using haul trucks, dozers, motor graders and other service vehicles.
B. APPLICABLE LAWS AND ORDINANCES
The incorporated municipalities of Cripple Creek and Victor and the community of Goldfield do not have a
noise ordinance that addresses noise emissions associated with mining activities. Teller County does
have a section in the Teller County Land Use Regulations - 11-30-2003, which along with other
environmental factors includes noise. This section of that regulation is replicated as follows.
EX-10 EXTERNAL EFFECTS. External effects include noise, dust, odor, blowing or flowing materials,
heat fumes, smoke, vibration including blasting, air pollution and water pollution.
The tract for a proposed use shall be large enough and/or reasonable safeguards shall be provided
so that the external effects of the proposed use on adjoining properties, as measured at the property
boundary or project boundary (whichever affords the greater level of protection to the adjoining property)
shall not exceed standards contained in or referenced by the Colorado or Federal statutes, regulations, or
ordinances, as they may be amended.
The standard to be applied shall be that for the adjoining parcel, as illustrated by the following
example: if an industrial use is proposed to be located next to a Residential Property, the external effects
of the industrial use shall not exceed the standards for the residential use at the boundary between the
industrial use and the Residential Property. For the purpose of determining the external effect, an
adjoining agricultural property shall be considered a Residential Property.
This section EX-10 does not apply to agricultural uses.
Section EX-10 of the Teller County Regulations states that "standards contained in a reference by the
Colorado or Federal statutes, regulations, or ordinances, as they may be amended": The applicable law
is the State of Colorado Revised Statutes, Volume 8, Titles 25-28, Article 12, Noise Abatement. Section
25-12-103, "Maximum Permissible Noise Levels" limits the noise level for Residential Zones to 55 dB(A)
daytime (7:00a.m. to next 7:00p.m.) and 50 dB(A) nighttime (7:00p.m. to next 7:00a.m.). Using the State
of Colorado Noise Law as the standard then the noise level at any residential or agricultural zone
adjacent to the CC&V mine shall not exceed 55 dB(A) during the daytime and 50 dB(A) during the
nighttime.
For most noise sources such as those associated with mining equipment, the A-weighted, slow setting of
the sound level meter is the accepted measurement method.
The Teller County Planning Commission issued a Written Findings dated June 27, 2000 approving a
variance to allow a 5 dB(A) increase to the daytime and nighttime noise limits for residentially zoned
properties as specified in the State of Colorado Noise Law CRS 25-12-103. The variance is only
applicable to property, parcel or tract that is not occupied for residential purposes. Specific details as to
how the measurements are delineated in the variance and are similar or identical with the methodology
detailed in CRS 25-12.
Rev # EDI Job No. C3616
Page 5 of 17
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