2008-04-15_REVISION - M1980244 (336)

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Ji1Zdpmlcs J _ noted 4. Receptor Site D-D Located in Section 7 adjacent to CR821. From the site, the distance is 3162 ft. in the south- southeast direction to the North Cresson Mine. This receptor site is a seasonally occupied travel trailer. 5. Receptor Site E-E Located in Section 18 south of CR821 and north of CR82, at about equal distance. From the site, the distance is 1972 ft. in the southwesterly direction to the boundary of the North Cresson and East Cresson Areas. The receptor site in on an access road from CR 821 and is a residence. 6. Receptor Site F-F Located in Section 18 at the Molly Kathleen Mine. From the Molly Kathleen Mine, the distance is 1245 ft. to the North Cresson Area. 7. Receptor Site G-G Located in Section 24 near the intersection of Silver Street and East Bennett Avenue in Cripple Creek. From this street intersection, the distance to the North Cresson Area is 1777 ft. 8. Receptor Site H-H Located in Section 24 and east of the rail line. From the site, the distance is 2787 ft., to the area presently identified as the Squaw Gulch Overburden Storage Area. This receptor site is a residential area in the southeast portion of Cripple Creek. B. ANALYSIS OF SITES Eight noise receptors were chosen as discussed in the Part A, Noise Assessment Approach. These noise source receptor locations are shown on the site map presented in Appendix B. A heavy line between the noise source and receptor is shown on the site map and the lines are labeled A-A thru H-H. A cross-section for each of the lines is presented in the eight figures following the site map in Appendix B. The location of the 55 dB(A) and 50 dB(A) levels are shown for the truck/shovel combination operating at a mine location closest to the noise receptor. 1. Site A-A Receptor A' is 1450 ft. from the mine. Overburden removal and the construction of an approximate 30 ft. high berm will take place during the daytime. The completed approximate 30 ft. high berm will provide a noise reduction of 10 dB(A). Figure A-A shows the 55 dB(A) and the 50 dB(A) contour for the truck/shovel operation. 2. Site B-B Receptor B' is located 2230 ft. from the mine boundary. Receptor B-B is also located behind a 100 ft. rise in the terrain and the barrier effect of the terrain will provide a minimum noise reduction of 8 dB(A). Figure B-B shows the 55 dB(A) and 50 dB(A) contours for the truck/shovel operations. 3. Site C-C Receptor C' is located 5916 ft. from the permit boundary. The distances to the 55 dB(A) and 50 dB(A) contours are shown on Figure C-C. (Because of the distances between the equipment and the receptor, a noise berm is not required. 4. Site D-D Receptor D' is 3162 ft. from the mine boundary. Receptors D, E and F have a common noise source location at the mine boundary. An approximate 30 ft. high berm will be constructed along the mine boundary and will provide a minimum noise reduction of 10 dB(A) at these three sites. Figure D-D shows the 55 dB(A) and 50 dB(A) contours for the mining operations in the direction of D'. Rev # EDI Job No. C3616 Page 12 of 17 3925 S. Kalamath St., Englewood, Colorado 80110 9 voice: 303-761-4367 9 fax: 303-7614379