2000-01-21_GENERAL DOCUMENTS - C1981017

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The Stormwater Best Management Practices implemented as part of the Facilities Area Project include: - All areas were deeply ripped by a dozer following topsoil application. Ripping occurred perpendicular to the fall of the slope. The ripping created numerous parallel dirt ridges throughout the area and greatly scarified the ground surface between the ridges. The ridges will act to contain runoff, and the highly scarified nature of the intervening areas will encourage infiltration of snowmelt and rain water. - Silt fence was installed on the bank just above Coal Creek west of Road A. Any drainage which may emanate from this area will pass through the silt fence before reaching Coal Creek. - Straw bales were placed in various locations to treat drainage from Road A and from other small areas prior to the water discharging into the adjacent creeks. - Silt fence was placed at the toe of each cut slope adjacent to the North Fork of Dutch Creek in order to minimize sediment contributions to the stream. All told, 15.6 acres were reclaimed during performance of the Facilities Area Project, for a total cost of $ 81,524. . ; NORTH BASIN STEEP SLOPE REVEGETATION PROJECT / NON-POINT SOURCE PROJECT The North Basin Steep Slope Revegetation Project was originally bid out in the summer of 1998. However, as a result of litigation pending at the time, the Project was suspended until 1999. During the interim, the Division applied for, and was awarded, a ;non-point source grant from the Water Quality Control Division. This grant provided cash funding in. the amount of about $ 121,000 to supplement the North Basin Steep Slope. Revegetation Project Construction began in early September 1999 as work crews were brought onto the site. Using hand tools, shelves were dug into the slopes. The shelves provide numerous slope breaks where seed can accumulate and germinate. Each shelf measures approximately ten inches wide by six to eight inches deep. They are constructed on three foot centers (horizontal and vertical). The crew members worked ten to fifteen feet distant from each other, spread horizontally across the slope. The crew worked from the top to the bottom of each slope. Approximately 4,448 shelves were constructed per acre, representing about 2,000 square feet of flat area per acre of mine bench outslope. While the hand crew was creating the shelves, a second crew collected and cleaned seed obtained from the locally occurring native bunch grass, Calamagrostis. In addition, seed 10