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Site Description <br /> Pre-2017 reclamation activities of the modern tailings were approved under TR-01 and TR-03 and <br /> completed in 1999 and 20004. The 5.7-acre flattop surface of the modern tailings is capped with inert <br /> local colluvium and adequately vegetated with willows, cottonwoods, grasses and forbs. The 4.9-acre <br /> slope is largely devoid of vegetation and consists of a base layer of tailings sand covered with colluvium, <br /> 0-6"thick,mixed with windblown sand from the historic tailings. The crest of the slope supports <br /> sporadic forbs,cottonwoods and grasses; and the toe has sporadic willows and grasses growing along the <br /> contact of the natural alluvium of Sneffels and Canyon Creeks (Attachment D,photo 1). <br /> Since 2000,the conditions of the slope have been monitored by the former mine owner and the Divisions. <br /> No significant rills or major points of erosion have occurred in the past 17 years demonstrating that the <br /> slope is not susceptible to significant surface runoff or raveling. <br /> The slope is included in the Work Plan because EPA is concerned the adjacent perennial streams could <br /> undercut the toe of the slope during high flows. Phase 1 Task 4 will address armoring the stream banks of <br /> Sneffels and Canyon Creeks to prevent undercutting of the toe of the modern tailings during flood events, <br /> which will consequently address approximately 1.7 acres of the slope. Therefore,the only erosion issues <br /> that remain to be addressed in Phase 2 of the Work Plan are preventing runoff and wind erosion from the <br /> remaining 3.2 acres of the slope that is above the Phase 1 work area. <br /> Proposed Work <br /> Caldera proposes to establish vegetation to the slope by hydraulically applying the following mix of <br /> fertilizer, additives,growth media,mulch and seed(see Attachment E for product specifications): <br /> 1. Rich Lawn 3-6-3 with Mycorrhiza&Humate(2,000 lbs/ac) <br /> 2. Quantum Growth Light(2 gal/ac) <br /> 3. Quantum Growth VSC (2 gal/ac) <br /> 4. ProGanics Biotic Soil Media(4,000 lbs/ac) <br /> 5. Disintegrating Sulphur(2000 lbs/ac) <br /> 6. EcoFlex High Performance Flexible Growth Medium(4,000 lbs/ac) <br /> 7. Native seed mix applied at 29.23 lbs/acre containing: <br /> o Slender Wheatgrass(7 lbs/ac) <br /> o Mountain Brome(7 lbs/ac) <br /> o Blue Bunch Wheat Grass (2 lbs/ac) <br /> o Canadian Wildrye(2 lbs/ac) <br /> o Lewis Flax(2 lbs/ac) <br /> o White Yarrow(0.02 lbs/ac) <br /> o Colorado Columbine(0.13 lbs/ac) <br /> o Fringed Brome (1.11 lbs/ac) <br /> o Rocky Mountain Fescue(0.99 lbs/ac) <br /> o Showy Goldeneye(0.52 lbs/ac) <br /> o Silky Lupine(3.48 lbs/ac) <br /> o Bigelow's Aster(0.86 lbs/ac) <br /> 4 See September 28,2000,annual report and inspection report. <br /> 5 See all inspection reports from 2000 to present. <br /> Page 2 of 4 <br />