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Engineers' Comments ikeview Quarry • <br />Pe; Letter of April, 1979 <br />Page 7. <br />C. Comment--Continued <br />reservoir could be constructed. It would not only function as a fire <br />storage facility, but for storm runoff detention and a silt retention. <br />Middle Drainage: <br />Surface runoff to the middle sub-basin is sheet flow. This sheet <br />flow across the mined area is caused by three small streams entering <br />the site at the Westerly boundary (See Attachment 115). This sheet <br />flow is to be maintained within the site.. By maintaining sheet flow, <br />the runoff velocities will be slower. Slower velocities increase the <br />time of concentration which decreases peak flows. In addition, <br />erosion is minimized due to the slower velocities. During the <br />reclamation phase, this "sheet flow will be maintained by the installation <br />of three (3) check dams at the Westerly boundary of the mine where these <br />three streams enter the disturbed area. Limestone fines contain about <br />50 to 70% course fragments with some of the course material being <br />several inches in diameter. The erodibility of this material is low. <br />However, that material which is deposited on the fairly steep slopes <br />would be protected by contour trenches or intermittent placement of <br />large rocks. <br />South Area: <br />Runoff to the Southern sub-basin is from a small area of land. <br />Peak flows can be expected to increase slightly at the beginning of <br />the mining operation, however, this increase will be negligible because <br />the mining area contributes runoff from only 7 acres to the sub-basin. <br />As the mining excavation advances to the stage where a slight depression <br />has been created on the ridge, runoff will no longer be directed to the <br />existing stream bed. Because this mining area is at the top of the <br />ridge, no runoff will enter the mining area except that rainfall which <br />falls directly on the mine. <br />D. RECLAMATION PLAN MAP <br />uestion: <br />(1) Indicate estimated final topographic configuration; <br />(2) The areas to be reclaimed for different end uses; and <br />(3) The water control systems should all be clearly shown. <br />Comment: Attachment No. 2 contains an amendment to the Reclamation Plan <br />as previously submitted. The approximate final topographic configuration <br />