2020-04-06_PERMIT FILE - M2019054 (2)

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later spring through early winter. In addition,the area is subject to high winds throughout the year, as high as a constant 30 mph with gusts exceeding 40 mph which greatly exacerbates the evapotranspiration rate of the soils in the area. As an example for comparison, referring to a January 2010 study presented with reference to the Ridgecrest Solar Energy Project in Indian Wells Valley, California, it was determined that the contractor's proposed dust control was grossly inadequate for the conditions encountered at the project site. It is important to note that the geological situation and soil conditions at the Ridgecrest Solar Energy site are very similar to the geological layout and soil conditions of the Strip Mine's proposed Skull Creek site. At the Ridgecrest site,the contractor had proposed an application of 2050 gal/acre/day. It was estimated that the application would continue daily for a period of 9 months throughout the year,or approximately 270 days. The contractor did not take into consideration the evapotranspiration rate of soil in that area, which in summer and high wind could exceed .3 inches/day, an amount that calculated out to be three times the proposed application rate. Taking that into consideration, and using the calculations provided with the Ridgecrest project,we can assume the following: The Proposed Strip Mine area to be treated for dust control: The Strip Mine has indicated that they will be excavating on approximately 140 acres of land at the proposed site. Let's assume conservatively,that they will require dust control on 20%of that excavation land at any given time. That factors out to approximately 28 acres of land requiring daily dust control. The Moffat County Department of Roads and Bridges will require, among other things,that the ingress/egress from the subject site to State Highway 40, be maintained for dust control. 3 miles of County Road 104= 15,840 linear feet, x 20 ft. wide =316,800 square feet. We know there are 43,560 square feet in an acre. Multiplied by 28 acres= 1,219,680 square feet. Excavated acreage of 28 acres: 1,219,680 Dust control County Road 104 216,800 Total square feet 1,436,480 Dividing 1,436,480 square feet by 43,560=32.97 acres needing daily dust control. There are 325,851 gallons of water in 1 acre foot. If we apply the calculations from the Ridgecrest site of 2050 gal/acre/day, which has already been proven to be inadequate, to the estimated acreage of the proposed Strip Mine needing daily dust control, we get a quantity of 67,588.5 gallons needed per day. Skull Creek Homeowners Objection March 17, 2020 Page 3