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<br />Aspen Highlands Ski Area <br /> <br />Impact Mitigated Required Mitigation Effective- Responsible <br /> nessl Party <br />Risk of mass movemenL or 1. Construction plans submitted for review for al] excavation I FS/ASC <br />other geological hazard located along catwalks and lift terminals shall include delailed <br />resulting from proposed surveys and designs. and a geotechnical (slope stability) <br />aClivities. assessment performed by an approved linn. <br /> 2. End-haul soil if full-bench construction is used. 1 ASC <br /> 3. Construct retaining structures to reduce cut and fill heights for I FS/ ASC <br /> roads built across steep slopes (typically required for slopes <br /> exceeding 55% or as specilied in the geOlechnica] assessmenll <br />Risk of debris flows 1. Design and construct a drainage system 10 handle spring runoff I FS/ ASC <br />resulting from saturation of incorporaling BMPs. <br />relatively thin soils on 2. Design and constntct debris now crossings to accommodate 1 FS/ ASC <br />steep slopes (e.g.. Leadville potential now volumes. <br />soils on slopes 01'>40 <br />percent) due to rapid <br />mehing of artificial <br />snowpack or from <br />roadways cutting across <br />alluvial fans. <br />Risk of erosion resu]lIng 1. Implement BMP for erosion control on disturbed areas 2 FS/ ASC <br />from disturbance of solis immediately. Revegetate by the end of the construction <br />with high erosion hazard season. <br />ratings (e.g.. soil units 2. Avoid concentrating runoff along mapped potentially unstable I FS/ASC <br />34C and 35C along pans areas to prevent landsliding. <br />of the Highland Bowl <br />Lift) <br />Hazard from rockfalls on l. Place signs warning summer visilors of the rockFall hazard. J FS/ ASC <br />natural cliffs (particularly 2. Close affected areas to summer visitors. I FS/ASC <br />along the Loge Bowl <br />Catwalk). <br />Watershed Resources <br />Increased erosion from 1. Monitoring of ground cover. channel stabi]ilY and 2 FS/ ASC <br />grading and excavations implementation of BMPs will occur in landem with any <br />and decreased water projecl development acli....lly and its mitigation. <br />quality 2. Within one (I) year for all approved development activities I FS/ ASC <br /> and prior to construction. a Drainage Management Plan will <br /> be developed, submitted for review, and approved by the <br /> Forest Service. <br /> 3. Obliterate, seed. fertilize and mulch the Red Onion I FS/ ASC <br /> maintenance road in conjunction \I,'ith Drainage Plan <br /> implementation. Provide natural drainage Ihat disperses <br /> runoff into filter slrips. <br /> 4. Physically identify construclion limils on the ground prior to I FS/ASC <br /> conslruclion. <br /> 5. Operate heavy equipment only when soil moisture is below 1 FS/ASC <br /> the plastic limit. or protected by at leasl one (1) foot of <br /> packed snow or two (2) inches of frozen soi l. <br /> 6. Avoid soil-disturbing actions during periods of heavy rain or I FS/ASC <br /> wet soils. Apply travel restrictions to protect soil and water. <br /> <br />16 <br /> <br />AssoclOted ActioflS and ReqUirements <br />ReqUired Mitigalwn and Momtoring <br />