2023-02-24_PERMIT FILE - M2022013 (8)

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Page 14 6.4.4 EXHIBIT D — Extraction Plan preferred native seed mixture offers opportunity to gauge the potential performance of the selected species prior to utilizing it over larger areas requiring reclamation later in the life of the resource recovery operation. Once vegetation is established over the initial reclamation soil stockpiles, they will likely remain untouched for the life of the operation until final reclamation of remaining affected lands takes place. Where concurrent reclamation is possible, operations will utilize soil in an over the shoulder method when practical. In this manner, reclamation is expedited without increasing soil stockpile volumes while reducing expenditures related to labor, handling, and time. 'Soil salvaged as stated above will range six to twelve inches in thickness. Resulting volumes of salvaged soil will range from 131,100± - 262,300± cubic yards for Central field, and from 33,100± - 66,300± cubic yards for the North West field. Salvaged soil will generally be stockpiled on top of the Westervelt soil storage area in the North-East section of Central field. Smaller short-term stockpiles may be created along the pit edges where regrading is imminent or in progress and recoiling will follow. Resoiling volumes required above the waterline of the lined water storage will require much less soil. The resoiling areas are estimated at 11.19 ± acres for Central field and 4.76 ± acres for the North West field with volumes at a nominal six inches of soil cover at 9,027 ± and 3,840± cubic yards respectively. Excess soil not needed on site may be sold. Dewatering: As extraction activity progresses into the aggregate profile, groundwater must generally be removed in advance through the use of pumps and subsequent discharge into area tributaries. A complete dewatering evaluation was perf ormed by AWES in their report of 2 7 July 2020, as provided at the back of Exhibit G: Water Information. The report concludes that `the results of analytical and numerical solutions indicate that the proposed mine dewatering activities will not adversely affect the regional groundwater hydrology.' The reader is further assured that all discharge of waters will be conducted under an approved CDPHE discharge permit. Initial dewatering of the property in preparation for extraction and resource recovery will occur by establishment of a dewatering pump and/or well in the Southern boundary near an existing agricultural pond. The point of discharge is on Exhibit G: Water Information Map. Other discharge locations may occur in time as needed and otherwise approved under the applicable 'Adequacy Item 23/32 VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2O22 A REGULAR IMPACT[1121 CONSTRUCTION PERMIT APPLICATION-COLORADO DIVISION OF RECLAMATION MINING&SAFETY OFFICE OF MINED LAND RECLAMATION