Laserfiche WebLink
1 <br />IRIS MITIGATION AND DESIGN INC. <br />IRIS 2022 Arapahoe Street <br />1 MITIGATION AND DESIGN, INC. Golden, Colorado 80401 <br />Environmental Consulting Phone: 720 - 272 -1985 <br />bleisure @irismitigation.com <br />PHASE 1 MITIGATION AREA CREATION <br />In June 2012, American Civil Contractors ( "ACC ") completed Schwartzwalder Mine - Phase 1 <br />construction activities to install an upstream concrete cutoff wall to bedrock across the valley. <br />ACC also completed creation of three required riparian mitigation areas located just upstream of <br />the cutoff wall (0.16 acre total) and two restoration areas also located upstream of the cutoff wall <br />(0.68 acre total) (see Table 1). All mitigation areas were then seeded and hydro - mulched in <br />July 2012 with either the upland, transitional or wetland seed mixes as detailed in the IRIS <br />"August 2011 Biological Assessment ". Seeding and hydro - mulching activities were completed <br />at all disturbed areas to stabilize the soil following Phase 1 construction activities. <br />The mitigation sites located on the north side of the Creek (approximately 0. 16 acre total) were <br />trampled by cattle which had strayed across the site in late August/early September 2012. The <br />0.09 acre restored upland area located just south of the cutoff wall was not trampled. Due to <br />this trampling and the hot summer conditions, the 0.16 acre mitigation areas were reseeded and <br />Istabilized with erosion control blanket, at Cotter's expense, in mid - September 2012. <br />All seeding and mulching of Phase 1 mitigation areas was completed in 2012 as per the revised <br />actual area impact and mitigation calculations (see Table 1). <br />2013 Tree and Shrub Installation <br />The required Phase 1 mitigation area trees and shrubs were installed in late April and early May <br />2013. The tree and shrub count is detailed on Table 2 and included 2 upland trees, 208 upland <br />shrubs, 20 riparian trees, 120 riparian shrubs and 150 willow stakes. <br />Schwartzwalder Mine Phase 1 — 2014 Second Annual Mitigation Monitoring Report Page 2 <br />March 2015 <br />11 <br />