Laserfiche WebLink
structure, one berm and a sedimentation pond. <br />The SEDCAD+ computer model was used to design all of the drainage <br />control structures, except Berm MP-1 on the southwest side of the explosives <br />magazine pad. Berm MP-1 will be constructed to a minimum height of two feet. <br />Exhibit 4.6-6 shows the location of the structures and the watershed <br />dissection used in designing them. Exhibit 4.6-7 shows the facilities <br />sediment pond, while Exhibit 4.6-8 shows a cross section of the sediment pond. <br />Results of the SEDCAD+ computer simulations, design specifications and <br />graphical representations of the ditches are provided in Appendix 4.6-Q. <br />The watershed boundaries and direction of sheet flow in the immediate <br />vicinity of the facilities (subwatersheds J1,B1,S1,SW1; J1,B2,S1,SW1, <br />J1, B2,S1, Sw2; and J1, B1,S1,SW3: see Exhibit 9.6-6 for locations) will be <br />established as follows: <br />J1,B1,S1,SW1: <br />Southern boundary- This boundary will be established by grading <br /> areas to the north to have a lower elevation with <br /> areas to the south of the drainage break being <br /> included in the previously approved small area <br /> exemption shown on Exhibit 4.6-23. The drainage <br />• area to the north of this watershed break <br /> (between the maintenance shop and truck/storage <br /> shed) will be graded and sloped toward a center <br /> line as the low point between the two structures. <br /> The centerline will also be sloped to direct <br /> drainage northward to culvert FC-1. <br />Eastern boundary- The boundary consists of the center roof line of <br /> the maintenance shop. Drainage to the west of the <br /> centerline is directed to the low point between <br />the maintenance and truck/storage shed as <br />previously mentioned. Drainage to the east of <br />the roof centerline and north to the hopper is <br />captured by the Goat Trail drainage system and <br />directed towards the tipple sediment ponds. <br />Between the maintenance shop and the hopper, the <br />drainage break is established by the naturally <br />• 9.6-34a May 20, 1993 <br />