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2008-04-15_REVISION - M1980244 (336)
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2008-04-15_REVISION - M1980244 (336)
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Last modified
6/15/2021 5:52:10 PM
Creation date
4/27/2009 11:51:14 AM
Metadata
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Template:
DRMS Permit Index
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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dwij,',!2?ics <br />rfi?ge b. Second and Deeper Level Benches <br />The face of the first bench will be 35 ft.. so the total noise barrier height will be the height of the <br />berm and the face or 65 ft. above the floor of the second bench. The effective height of both the <br />Hitachi 4500 haul truck and the Hitachi 5500 front-end loader is about 15 ft. above the bench floor <br />so the effective barrier height is 55 ft. The bench face and berm will reduce the noise of the haul <br />truck and front end loader by 18 dB(A). This 18 dB(A) reduction will pull-in the 50 dB(A) location <br />of 550 ft. from the berm and the 55 dB(A) location much closer. <br />When the first bench has been excavated by the loader, the rock drills will start drilling at the top <br />of the second bench. The total barrier height will be the same as for the loader and haul truck, <br />which is 65 ft. The effective noise source height of the rock drills is about 10 ft., which means <br />that the 50 dB(A) locations will occur at about 500 ft. As benching continues, the height of the <br />noise barrier increases and both the 55 dB(A) and 50 dB(A) locations are pulled further in. <br />Haul Road and Haul Trucks <br />The column titled Surface, No Berm in Table 6 presents the distances to the 50 dB(A) noise level <br />when the equipment is at the surface and there is no berm or intervening terrain. The column titled <br />Mine Floor presents the distances to the 50 dB(A) level when the equipment is either behind the <br />approximate 30 ft. berm or behind the approximate 35 ft. face of the first bench; either of which <br />provide a minimum noise reduction of 10 dB(A). The calculated noise reduction values for the berm <br />or bench face are greater being as much as 15 dB(A) but have not been used in these calculations. <br />Table 6 <br />Initial Mining Phase including Haul Road <br /> Noise Levels <br /> Reference dB(A) Distance to 50 dB(A) Contour <br />Equipment at 100 ft. Surface, No Berm Mine Floor <br />CAT 992 Loader 75 1800 600 <br />CAT 777 Haul Truck 74 1600 500 <br />CAT D-1 ON Dozer 75, 1800 600 <br />Hitachi 4500 Haul Truck 76 2000 630 <br />Hitachi 5500 Shovel 83 3500 1400 <br />The reference dB(A) value at 100 ft. for the Caterpillar Model 777 was obtained from the Caterpillar <br />Engineering Department. <br />The dB(A) values at 100 ft. for the Hitachi 4500 haul truck was obtained from actual drive-by <br />measurements conducted at the CC&V Mine on February 3, 2004 and the data are presented in <br />Table 7. <br />Table 7 <br />Hitachi 4500, 310 Ton Haul Truck Noise Levels <br />Condition dB(A) at 100 ft. <br />Loaded - Flat Terrain 76.7 <br />Empty - Flat Terrain 71.8 <br />Loaded - Uphill 10% Grade 75.7 <br />Loaded - Downhill 10% Grade 77.5 <br />Loaded - Downhill 10% Grade 66.9 <br />Loaded Uphill 10% Grade 77.7 <br />Average 76.0 EQ. <br />Rev # EDI Job No. C3616 <br />Page 15 of 17 <br />3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 9 fax: 303-761-4379
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