Laserfiche WebLink
average depth of the land is 10 feet minimum below the berm. Willits Ponds 4, 5 and 6 are in place <br />to provide additional protection for outside edges of piles (which are primarily pre -law). These <br />ponds and ditches leading to them are shown on Map C -4. <br />Area South of Access #1 <br />The area around the active mine pit will drain to the pit, which is well below the surrounding area <br />and will allow water to infiltrate into the ground. <br />The gold mining operation will control sediment through a number of measures. <br />First, the minimum 8' berm created on the west side of the permit area next to the ROW of Highway <br />9 will channel all runoff from any disturbed areas into two sediment ponds located at the southeast <br />corner of the permit area. This is also the low point of the permit area. Water will enter South Pond <br />#1 which will then flow into South Pond #2. South Pond #1 will serve as the cleanout pond, while <br />South Pond #2 will serve to collect runoff from a 100 year event, al- though much of this flow will <br />be captured in either Pond #4 (below the prep plant) or the active mining pits. At the southern end of <br />the mining area, the South Ponds #3 and #4 will be installed to handle pumped water from the active <br />mining pit. This will allow the clean water to seep back into the ground, thus avoiding a discharge <br />from the site. No runoff from the site will be allowed to enter ponds #3 and #4. <br />The 8' high berm will have a maximum 2.OH:1.OV and will be created from the existing disturbed <br />gravel on the site. Topsoil may also be used to create the berm on the southern portion of the mining <br />area if excess topsoil is available from stripping. In all cases, gravel and topsoil will not be mixed to <br />create the berm. A ditch of 2.0 feet depth and 2H:1 V sideslopes (Collection Ditch #1) will be <br />constructed on the west side of the berm to direct all disturbed area flows into Pond #1, then Pond <br />#2. <br />This ditch will cross access roads in two locations as shown on Map C -2, where an 18" culvert will <br />be placed in the ditch for the road crossing. <br />The terrain rises to the east from the permit area, but the Columbia #1 Ditch is located near the east <br />Alma Placer 1115 21 <br />