2023-01-04_PERMIT FILE - M2022013 (8)

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Page 123 6.4.4 EXHIBIT D — Extraction Plan 'The conveyor will be set on an elevated structure at varying heights to be situated about the 1 in 100-year flood level. An average height of 7 feet is expected. The conveyor will be supported by legs at intervals of approximately 40 feet with typically 6- x 2- x 2-foot concrete blocks sitting on ground surface used as necessary to anchor the legs. The conveyor will span the river channel and metal (or other appropriate material) pans will be installed under the conveyor structure to prevent spillage into the river. The design will be similar to other Raptor locations where an extended span has been required to cross a county road. Final conveyor specifications are to be determined however belt width is anticipated in the range 24-36". Ultimately, once the wash plant activities near the completion of extracted deposit material, the closed system wash pond will fill with silt and be revegetated in a manner consistent with Exhibit E - Reclamation Plan. Interim clean out of the wash pond will occur until that point, returning the inert materials to the bottom of exhausted pits, or utilizing it in part or in whole as product, or for purposes as substitute soil, soil additive, or as subsoil for reclamation. Plant and material processing activity will divide materials into diverse and dynamic product stockpiles that will come and go with unpredictable variations in sale and production. To the extent possible, product material will surround plant activities to further lessen visual and noise impacts to surrounding properties. Plant placement will assure that plant noise is well below that of the nearby traffic. Relative to noise, traffic travelling on area roads at 5 5 mph or above is approximately 70.0± decibels within 100 feet from the centerline of the Highway. Noise at ground zero at a cone crusher, as measured by a hand- held meter, is at 80.0± decibels, dropping to 70.0± decibels at I00.0± feet from the center. The level drops an additional 5.0± decibels for every 100.0± feet from the center of the crusher and surrounding plant noise, achieving residential background levels at a total setback of 400± feet. Backup sirens and heavy equipment averaged 60.0± to 75± decibels, with similar decreases in decibel readings from the source measured in a manner similar to that indicated for the crusher and plant equipment sources. Plant stockpiles will aid muting of plant sourced noise just as noise levels at areas of extraction are buffered with increasing depth of extraction. The location of the portable scale and scale house and correlated internal traffic at the plant site location will vary depending upon production levels and areas needed for product stockpiling. Regardless, the scale house will be 'Adequacy Item 24 VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2O22 A REGULAR IMPACT[1121 CONSTRUCTION PERMIT APPLICATION-COLORADO DIVISION OF RECLAMATION MIING&SAFETY OFFICE OF MINED LAND RECLAMATION