2021-10-29_PERMIT FILE - M2021064 (6)

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M-2 OPERATIONS: Days and times, weather and ground conditions See Exhibit C. Operations will be conducted during daylight hours, generally Monday through Friday, with some extended hours and weekend work as needed for specific projects. During the peak construction season,there will be hauling on Saturdays, again only during daylight hours.Work at night and prior to 0600 will be limited to urgent equipment repair and maintenance and delivery of equipment. Operations other than loading and hauling will be curtailed in extreme weather conditions including high winds (greater than 20 mph sustained or gusts over 30 mph), heavy rain or snow. Haul of equipment and material may be delayed or reduced in weight and frequency during spring thaw and as ordered by Archuleta County Road Department and/or Sheriff. Hauling operations—the hauling season—will be done up to 270 days per year, with an estimated 80%of production hauled during 180 operating days (up to six days per week) and an estimated 20% hauled during the remaining 90 days(not more than five days per week). No hauling is proposed for Sundays or holidays. Production operations—the processing season when excavation,crushing and screening of materials will be done—will be at least 50 days per year,but may last up to 100 days per year. No processing is proposed for nighttime, Sundays,or holidays, and will be limited to weekdays as much as possible. Mobilization/demobilization (deployment) of processing equipment will normally require 3 to 4 days at the beginning and end of the processing season, usually once per year, and will not be done on Sundays or holidays. Light and visual impact While the forest to the East of the planned mining and plant area, and the forested Oakbrush Hill eastern and northern slope(to remain in dense forest)will reduce or eliminate visual impact and potential for light pollution to properties to the North, East, and West,there is some small potential for minor impact to the property to the South, and to skyglow.Therefore, operations will generally be limited to daylight hours, and if maintenance or other work is needed early morning or evening,full-cutoff lighting and orientation of lighting to reduce or prevent impacts off-site will be used. Operator requests authorization to request temporary extension(to time certain)of the County Development Director for extended operating hours to meet customer needs(example: CDOT or USFS projects). Blasting There will be no blasting done on site for the operation. Noise potential Noise impact of operations and traffic to and from the site on neighboring properties may exist but is expected to be relatively low due to terrain,distances, and operational procedures. The location of the site, east and south of the crest of Oakbrush Hill and well above the valley floor of Dutton Creek, and the dense forest will remain around the operations. Therefore, little if any problem with noise is expected, as with light, and noise reduction is taken into account in the overall design and selection of stockpile and plant locations,direction of working,and other noise control measures integrated into the operation. Typical sources of noise associated with sand and gravel extraction include operation of mobile and stationary equipment(engine,conveyor and like noises), back-up alarms, movements of vehicles inside and to and from the site(brakes, acceleration,etc.), and noises associated with heavy machinery and construction. During periods when traffic is not present on CR-600, other sounds carry well, but trees and the terrain help contain noise. The nearest dwellings are the Lemon Family Residence approximately 400 feet south of the south parcel boundary (and 800 feet from the proposed affected area). Other dwellings and occupied structures are a quarter-mile or more from planned operations and at least one-half-mile from the plant and stockpile/loading areas For the most part, the various buffers and distances ensure that operations are separated from all potential receptors, and noise levels will remain under the state-mandated 55 dBA at those receptors, and under the county- mandated 55 dBA at the parcel boundaries. Although expected to be rare,the operator may need to use pneumatic hammers and breakers to process large boulders and to produce certain products(such as riprap with a D50 spec>12-inch).This process may produce louder noises but is not expected to exceed the above limits. However,noise control for such operations is addressed below. C&J Gravel Products, Inc. Page 58 of 93 20 OCT 2021 Application for Permit: Oakbrush Hill Gravel M-2021- C&J-DPR-V5-001