2022-04-04_PERMIT FILE - M2022013 (5)

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Page 115 6.4.5 EXHIBIT D - Extraction Plan times, safety will take precedent and over-ride all other conditions in time with a matter of safety or emergency respective to any and all aspects of the approved permit. To minimize the potential of river capture, planned setbacks from the two rivers was evaluated by Flow Technologies (refer to report at the back of Exhibit G: Water Information- titled: `Two Rivers Riverside Berm Failure Analysis and Flood Control Mitigation Plan' of 22 January 2020). The report finds: `... that head cutting/erosion will not progress through the full length of a 100-ft riverside berms. It is important to note that should a flood occur that results in head cutting/erosion of a riverside berm, Varra Companies, Inc. will act diligently to restore the damaged areas to pre- flood conditions. As mentioned, this analysis is conservative and riverside head cutting/erosion is based on the 100-yr flood. There is a small probability that such a flood event could occur during extraction and when the pit is dewatered. During extraction, a predominantly vertical advancing pit wall (the extraction front) is not anticipated due to the use of excavators in the removal of the material deposits. Excavators provide a great deal of control over the extraction process. The maximum length of the extraction front will likely never exceed the length of one side of a quarter section of land, or 1,320± feet, or less; in any given direction. The advancing front will result in a moving face with a slope typically equal to or flatter than 1.25H:1V, and commonly not greater than 1.25H:1V along the perimeter of the extraction limits to depth. The exception to cut perimeter slopes is shown with a distinct Red Boundary on Exhibit C-2: Extraction Plan Map, where cut slopes will not exceed 2H:1V in order to maintain integrity and stability along that designated perimeter area (refer to the AWES Slope Stability Analyses of 23 December 2019, located at the back of this exhibit). Internal transport of extracted materials to conveyor systems or other internal transport; or otherwise by approved public roadways, will be used in the transportation of extracted materials to the designated plant/stockpile location, described in greater detail, below. Acreage to be affected during the first year of extraction activities include the establishment of the initial Wash Pond and attending Settling Pond(s), Plant Site, and Initial Areas of Extraction and attending means of transportation by ground haulage or conveyor. While the acreage required for the Plant Site and Wash Pond are not expected to change, the Initial Area of Extraction will 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