2023-01-04_PERMIT FILE - M2022013 (2)

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difficult to portray in advance. Here's some additional information taken from the application on the planned keyways: 3 6.4.12 EXHIBIT L-Reclamation Costs follow the perimeter of the extraction limits over approximately 75.45± acres in order to establish the perimeter keyway for the 127.10±acre Center Section of Central Field, The perimeter extraction will leave a 51.65± acre Core, that may be extracted as needed as keyway drainage capacity allows. The initial extraction area is bordered to the South along a near 800±foot section of oil and gas line that is pending removal; along with the two oil and gas wells, also pending removal (refer to Exhibit C for ownership details). Extraction will not occur within 10 feet of these lines;or 25 feet from the wells,as indicated in the setbacks detailed under Exhibit D: Extraction Plan. Below this gas line is an existing pond and well that will be used as a Settling Basin Area, containing at present a solitary settling basin and pump as a point of discharge of groundwater. This pond may be expanded or added to below this line, and may then be extracted itself once discharge is discontinued for Central Field Operations. Perimeter Keyway Extraction will maintain a perimeter slope no steeper than 1,25HAV, except for the perimeter shown in red along it's extraction limit, and respective toe where cut slopes will not exceed 2.00Fl:1V; as indicated (refer to Exhibit S: Stability Analysis for additional information). At the toe of the cut perimeter slope is the keyway that runs below the extracted deposit of the basin, into the bedrock, which allows the subsurface waters to flow to the settling basin and discharge pumps necessary to keep the cut basin dry during a time of extraction and reclamation of the affected perimeter slopes. The keyway dimensions may vary more or less from 4± to 8t feet in depth and 4f to 16± feet in width. Extraction must be broad enough to allow equipment to safely approach the toe and exise the bed dimensions where the resulting channel is sufficient to convey the groundwaters to the settling basin for discharge. Please Note: The graphic representation of the Perimeter Keyway Extraction and Core are idealized, and may vary in shape and size presented. Annual Reports will report on the nature and extent of affected lands and more properly reflect actual conditions on the ground in a given year of operations.j Division Second Adequacy Comment • The Division reiterates that structures related to the mining operation need to be on Exhibit C-a Regarding soil piles. RM states in the responses that, "There are no soil piles at this time, "however, the purpose of the map is to illustrate the plan for soil piles in the future, and those should be shown on the map. • The Division requests that the term "If eyu,ay"be clarified by RA II Is this actually a de- Tvatering trench? • The purpose of Annual Reports is described in Rule 1.15. These reports are not to be used to make changes to the mining and reclamation plans. Those changes must be made with technical revisions and amendments. 161 Page Correspondence to the Colorado Office of Mined Land Reclamation—Reply to Rob Zuber,EPS—Adequacy Letters of 24 June and 5 August 2022; in the matter of the Two Rivers Sand.Gravel and Reservoir Project—M2022-013.