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Page 13 <br /> 6.4.12 EXHIBIT L - Reclamation Costs <br /> METHOD OF EXTRACTION: <br /> Before concurrent grading, resoiling, and revegetation for reclamation can commence, a <br /> perimeter keyway (dewatering trench') must first circumnavigate the area where the <br /> perimeter slopes form along the extraction limits. For Two Rivers, this includes four <br /> sequential areas of extraction: <br /> • 127.10± Acres - Central Field — Center Section <br /> 23.19±Acres - Central Field — North-East Section <br /> • 30.47±Acres - Central Field - West Section <br /> • 53.30±Acres - North-West Field <br /> Exhibit L: Financial Warranty Map, shows Initial Extraction will begin in the yellow hatch <br /> area shown on the Exhibit L Map, comprising 16.26±. The direction of extraction will <br /> follow the perimeter of the extraction limits over approximately 75.45± acres in order to <br /> establish the perimeter keyway for the 127.10± acre Center Section of Central Field. The <br /> perimeter extraction will leave a 51.65± acre Core, that may be extracted as needed as <br /> keyway drainage capacity allows. <br /> The initial extraction area is bordered to the South along a near 800± foot section of oil <br /> and gas line that is pending removal; along with the two oil and gas wells, also pending <br /> removal (refer to Exhibit C for ownership details). Extraction will not occur within 10 feet <br /> of these lines, or 25 feet from the wells, as indicated in the setbacks detailed under Exhibit <br /> D: Extraction Plan. Below this gas line is an existing pond and well that will be used as a <br /> Settling Basin Area, containing at present a solitary settling basin and pump as a point of <br /> discharge of groundwater. This pond may be expanded or added to below this line, and <br /> may then be extracted itself once discharge is discontinued for Central Field Operations. <br /> Perimeter Keyway Extraction will maintain a perimeter slope no steeper than 1.25H:IV, <br /> except for the perimeter shown in red along it's extraction limit, and respective toe where <br /> cut slopes will not exceed 2.001-1:IV; as indicated (refer to Exhibit S: Stability Analysis for <br /> additional information). At the toe of the cut perimeter slope is the keyway that runs <br /> below the extracted deposit of the basin, into the bedrock, which allows the subsurface <br /> waters to flow to the settling basin and discharge pumps necessary to keep the cut basin <br /> dry during a time of extraction and reclamation of the affected perimeter slopes. <br /> The keyway dimensions may vary more or less from 4± to 8± feet in depth and 4± to <br /> 16± feet in width. Extraction must be broad enough to allow equipment to safely <br /> approach the toe and excise the bed dimensions where the resulting channel is sufficient <br /> to convey the groundwaters to the settling basin for discharge. <br /> ' Adequacy Item 15:Keyway clafification <br /> VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2O22 <br /> A REGULAR IMPACT[1121 CONSTRUCTION PERMIT APPLICATION-COLORADO DIVISION OF RECLAMATION MIING&SAFETY <br /> OFFICE OF MINED LAND RECLAMATION <br />