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

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Page 119 6.4.4 EXHIBIT D — Extraction Plan 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 expand until concurrent reclamation follows as each location is exhausted of resource. Although initial extraction may otherwise result in temporary slopes up to I.2 5h:ly, all cut slopes will be backfilled with unconsolidated bedrock, overburden (on-site unmerchantable excess materials, or imported inert materials) and soil to advance the reclamation and completion of the desired basins. Final reclaimed slopes and grades will be concurrently established where practical to 3h:1y, or flatter, and at a minimum from 5± feet above to 10± below the expected water level of each location of extraction, and to the basin floor. Concurrent backfilling and grading of cut perimeter slopes, while desirable, may be obstructed in time and extent by the need to maintain keyways and basin discharge during extraction. Backfilling of slopes can only occur once enough of the floor is exposed to facilitate backfilling and finished grade of extracted basin slopes without interfering with basin discharge operations. This makes concurrent backfill difficult to accurately forecast. Regardless, any completed slope remediation will be indicated in any subsequent OMLR Annual Report. Cut slopes will cause direct precipitation to drain internally into the resulting basins and are not anticipated to result in any off-site impacts due to erosion or stormwater runoff. The gentle to near flat topography of the area landscape tends to aid in overall stability above the planned areas of extraction. While some erosion of resulting basin perimeter slopes will be evident subsequent to extraction, the advance of reclamation activity over affected lands will provide cover for both near and long-term stability of those lands remaining above water level of the finished basins. All completed slopes 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