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• New Castle Energy Corporation <br />Coal Ridge #1 Mine <br />STORM DRAINAGE CONTROL SYSTEM <br />The Colorado Mined Land Reclamation Division (CMLRD) requires <br />that a certification be made of the constructed facilities at the <br />Coal Ridge No. 1 Mine that relate to the storm drainage and <br />sediment control facilities. This certification is required to <br />indicate that the constructed facilities will function as those <br />permitted by the CMLRD. <br />SITE INSPECTION <br />A site inspection was made by the engineer on June 21, 1988. A <br />set of design drawings (Reference 2) were used on this inspection <br />trip. The drainage ditches were walked and measurements of the <br />sizes were made. Additionally, the culverts were measured and an <br />assessment made of their effectiveness. Measurements were taken <br />at the sediment pond (Pond A) to determine the size of the <br />facility and its capacity. <br />DRAINAGE DITCHES <br />Drainage ditches are provided throughout the surface facility <br />area as shown on the Mine Grading Plan (attached). The eastern <br />portion of the site does not currently exist, e.g., Pond B, the <br />Topsoil Stockpi]s for 21,000, 5,500, 20,000, and 2 each piles for <br />6,500 cubic yards of material. Pond B is NOT part of the runoff <br />or sediment control facilities but rather is an operational <br />component to facilitate the storage of Vulcan Ditch water for use <br />in the mining and makeup water for processing. <br />The drainage ditches exist on the the uphill sides of the roads <br />and serve to collect runoff and sediment from all disturbed areas <br />on the site. As shown on the Mine Grading Plan, there are three <br />configurations of ditches designed as required for the varying <br />flow capacities. Measurements made at the site indicate that the <br />drainage ditches equal or exceed the sizes indicated. <br />CULVERTS <br />Measurements were made of the corrugated metal pipe (CMP) <br />culverts on the site. Table 1 lists the design sizes and the <br />installed sizes of the culverts <br />All installed culverts equal or exceed the designed sizes. The <br />culverts, as installed, will function to direct drainage and <br />sediment to Pond A for detention and sedimentation. <br /> <br />