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New Bonevard. This area contains approximately 1.9 acres of <br />disturbed land. As stated above, it was constructed in the early <br />1980's. The drainage from the watershed above the boneyard is <br />conveyed around the boneyard via ditches. The only runoff from <br />the disturbed area is that which falls on the boneyard. <br />Office Area. The office area contains approximately one acre of <br />drainage area; of that, 0.61 acres is heavily vegetated grass <br />(lawn) area. The gravel parking area constitutes the only <br />sediment contributor for this area. <br />Design Analysis <br />General. In order to demonstrate that these above facilities <br />meet the intention of Division of Minerals and Geology <br />Regulations, Section 4.05.2(3) without constructing sedimentation <br />ponds, the following was taken into consideration. <br />1. Runoff from these areas was small compared to areas <br />that drain to sedimentation ponds. <br />2. Comparing the model with on-the-ground sediment after a <br />rain storm, it appears that the model over estimates <br />the amount of sediment running off these areas. <br />3. Insufficient data exists to predict the exact amount of <br />sediment that will be filtered by a silt fence. <br />4. Runoff from this area joins haulroad and pre-law area <br />runoff which is potentially a higher contributor of <br />sediment of these small areas. <br />Hydroloav. The hydrology of the watershed was analyzed utilizing <br />the SEDCAD+ computer program. SEDCAD+ is an enhanced PC version <br />of the SEDIMOT II computer program written by Civil Software <br />Design of Lexington, Kentucky. In performing this analysis, the <br />characteristics of the minesite drainage, reclamation to date and <br />sediment control procedures were considered. Table 7-6-7-1 <br />contains the design hydrology summary. <br />7-6-7-3 <br />