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

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The measured data at the 5 sites show that the baseline or existing noise environment ranges from as
low as 28 dB(A) during moments of silence to levels as high as 49 dB(A) due to cultural activities such as
motor vehicles.
CC&V has a noise monitoring station (Rigi Environmental Monitoring Station) located on the mine
property. The location of this station is in the southeast quarter of Section 29, T1 5S, R69W of Teller
County, Colorado. The elevation at the station is approximately 10,175 feet Above Mean Sea Level
("AMSL") and is located at Universal Transverse Mercator ("UTM") coordinates 428550ON and 488500E.
The site is approximately 100 feet west of County Road 84 and about 40 feet higher in elevation.
A noise monitor at the Rigi site records the noise level and those data are transmitted via a radio
transmitter to a receiver at the CC&V office. The noise level is then stored in a computer file and can be
displayed or printed out.
Table 2 presents the noise data on a monthly basis for the years 2003 thru 2007 that was acquired at the
CC&V Rigi Environmental Monitoring Station. These data show a range from as low as 32 dB(A) to levels
as high as 41 dB(A).
Table 2
Monthly Average Noise Level dB(A)
At the CC&V Environmental Monitoring Station
Month
1 2 3 4 5 6 7 8 9 10 11 12 Avg.
Average dB A -2003 38 37 36 36 38 38 41 36 38 37 37 37 37.4
Average dB A 2004 36 37 39 34 33 35 39 35 36 36 37 36.1
Average dB A 2005 36 36 35 34 . 34 34 34 35 34 35 34 34 34.6
Average dB A 2006 32 36 36 34 39 37 38 38 38 37 37 37 36.6
Average dB A -2007 38 38 37 35 37 36 38 38 37 34 35 36 36.6
• Noise Monitor not functioning.
C. 2007 Measurements Methodology and Results
Long term (hundreds of hours duration) noise measurements were taken at three locations in and west of
Cripple Creek. The three noise monitoring instruments used for the 2007 project were Quest Model
2900. These instruments were set to record the average A-weight, slow response sound level for each
and every one (1) hour interval during the entire time on location. In addition to the hourly records, the
day/night average, 5, 10, 50 and 90 percentiles were calculated and stored in the instrument's memory
and then downloaded along with the hourly data. Measurement site locations, date of run and run time
for the 3 sites were:
1. Site 1
Private residence at 125 Bison Street, Cripple Creek. 15 ft. from northeast corner of residence. This
located is approximately 38 degrees 45' 00.75" N and 105 degrees 10'19.10" W at approximately
9575' elevation.
Quest 2900 Sound Analyzer, s/n CD8020046
June 5 to June 12, 2007 - Run Time: 170 hours
June 12 to June 21, 2007 - Run Time: 212 hours
June 21 to June 26, 2007 - Run Time: 123 hours
June 26 to July 5, 2007 - Run Time: 216 hours
July 5 to July 12, 2007 - Run Time: 169 hours
July 12 to July 23, 2007 - Run Time: 262 hours
July 23 to August 7, 2007 - Run Time: 357 hours
Total Run Time at Site 1 - 1509 hours
Rev # EDI Job No. C3616
Page 7 of 17
3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: [phone]