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Home My WebLink AboutGolden Peak Ski base and Recreation District Parcel Part of Parcel 1 HYDROSPHERE Resource Consultants July 21, 2005 Mr. William T. Carlson, Environmental Health Officer Town of Vail 75 South Frontage Road Vail, CO 81657 RE: Vail Mountain/Golden Peak Stormwater Management Plan Vail Ski Area Permit C)R03-0541 —Post-Construction Report Dear Bill: On Friday, July 15, 2005, I met with Dave Tucholke and conducted a post-construction inspection of the Stormwater Best Management Practices (BMPs) that have been implemented at the Golden Peak area. I have also reviewed the Stormwater Inspection Report from your follow-up inspection on June 21, 2005. This letter reports the findings of my post-construction inspection and responds to the Follow-up Inspection Findings of � your Stormwater Inspection Report dated June 21, 2005. Overall, I believe that ski area I personnel have fully and successfully implemented the BMPs that were delineated in my � letter of June 20th, including the modifications and refinements recommended in the letter of June 29`" from Doug Laiho. My post-construction inspection covered the area below the half-pipe down to the area just below the upper terminus of Chair 12. I inspected and photographed all of the water bars and drainage improvements that have been constructed in this area. I also observed and photographed all of the ski slope areas that were regraded to remove slumps and rilling and revegetated. As summarized below, three of the newly constructed water bars and drainage improvements were configured somewhat differently than originally specified due to practical considerations and conditions encountered during construction. I believe these modifications were necessary and will not compromise the effectiveness of the Golden Peak Stormwater Management Plan. ❑ We had recommended that Waterbar No. 1 be moved approximately 20 feet down slope from the original alignment to avoid potential creation of a skier hazard. This change, however, made it impossible to configure the water bar with an adequate slope to convey water west to the roadside ditch. The drainage direction for this waterbar was therefore reversed so that it conveys Policy Analysis • Engineering • Environmental Assessment • Information Systems 1002 Walnut, Suite 200 • Boulder, Colorado 80302 U.S.A. • (303) 443-7839 • TeleFax (303) 442-0616 P.O. Box 445 • Socorro, New Mexico 87801 U.S.A. • (505) 835-2556 • TeleFax (505) 835-2609 " ' July 21, 2005 Page 2 water to the east side of the ski slope where it connects to the east end of Waterbar No. 2. Waterbar No. 2 was slightly enlarged to accommodate the additional flow. ❑ It was not possible to realign Waterbar No. 5 down gradient to the area below the rock outcropping because the bedrock was too close to the surface of the slope. The lower section of the waterbar was re-graded and moved up slope to reduce its gradient. With the installation of the new culvert below the half- pipe and construction of Waterbar Nos. 1 —4, there will be a very substantial reduction in the area that drains to Waterbar No. 5. These improvements, combined with flow attenuation associated with revegeation, will minimize the risk of another failure in this waterbar. ❑ The 4-inch drainpipes at the outfall of Waterbar No. 4 were eliminated because there was sufficient rock in the area to build a very substantial riprap apron rundown to disperse flows. Virtually all of the other recommended drainage improvements and erosion control BMPs were implemented as specified. The establishment of vegetative cover in the undisturbed areas that were seeded and mulched last year was progressing very well, and some sparse vegetation was beginning to grow in newly re-seeded areas, in spite of the recent unusually dry conditions. The straw mulch cover had been properly crimped into the soil as recommended in the Stormwater Management Plan. There are three additional measures that I am recommending based upon my field observations and in response to comments made by Mark Weinhold and Dave Tucholke. 1. Mark Weinhold commented that he was concerned that the 4-inch flexible pipe rundowns at the ends of several of the waterbars could freeze or become plugged by debris, which could result in erosion of the fill slope. The primary purpose of the pipe rundowns is to convey water over the edge of the fill slopes and disperse flows from the waterbars to the vegetated slopes below the fill material. We believe that with proper monitoring and maintenance, these pipes will function properly throughout the spring runoff period but that a backup mechanism, as recommended by Mark, is needed to minimize erosion potential if the pipes do become plugged. For this purpose, I recommend the installation of erosion control matting to cover the fill slopes at the ends of the waterbars where the 4-inch flexible pipes have been installed. This will serve to minimize the risk of erosion until vegetation becomes well established. 2. At the end of Waterbar No. 9, a pipe rundown to the roadside ditch has been installed, as specified in my letter of June 20`". The roadside ditch at the bottom of the rundown has been well lined and armored with riprap to dissipate energy. We had also specified installation of a riprap channel from the area below the road to Mill Creek. Because the gradient through this area is relatively flat and energy will be effectively dissipated at the lower end of the rundown, Dave Tucholke recommended the use of a wide grass swale Hydrosphere Resource Consultants,Inc.,1002 Walnut,Street Suite 200,Boulder,CO 80302 ' ' July 21, 2005 Page 3 instead of a riprap channel to convey runoff to Mill Creek. I concur with this recommendation. 3. At several locations between the waterbars at the edge of the fill material on the east side of the ski trail, there are signs of rilling and areas where it will not be possible to establish vegetative cover with seed and straw mulch only. In these areas the application of hydromulch or erosion control matting will be necessary. In areas where rilling has occurred, the slopes will need to be smoothed before the hydromulch or erosion control matting is applied. In conclusion, my post-construction inspection found that the drainage improvements and stormwater BMPs detailed in my letter of June 20th and the modifications and refinements recommended in the letter of June 29`h from Doug Laiho have been properly implemented. The minor modifications described above were justified and will not reduce or comprotnise the effectiveness of the Golden Peak Stormwater Management Plan. With implementation of the three additional measures and modifications described above, the work necessary to fully implement the Stormwater Management Plan will be complete. It is my understanding that these items will be completed by August 15, 2005. Please feel free to contact me if you have any questions or need any additional information. Sincerely, Hydrosphere Resource Consultants, Inc. by: ��r!�� !�/v�------- Robert M. Weaver cc: Matt Czahor, CDPHE, Water Quality Control Division Dave Gza�va, U.S.D.A Forest Service Paul Fillion, Vail Resorts Brian McCartney, Vail Resorts Dave Tucholke, Vail Resorts Hydrosphere Resource Consultants,Inc.,1002 Walnut,Street Suite 200,Boulder,CO 80302 HYDROSPHERE Resource Consultants July 1, 2005 Mr. Paul Fillion Vail Resorts P.O. Box 7 � Vail, CO 81657 RE: Chair Six Stormwater Management Improvements Dear Paul: In accordance with your request we have inspected the drainage conditions at the base of Chair 6 and have developed a conceptual plan for drainage improvements and erosion control. This narrative more completely describes the specific stormwater drainage for Area 10 as was conceptually described in my letter to you dated June 29, 2005 and together with that letter, completes the description of stormwater handling in the Golden Peak area that you have requested. General Drainage Description An approximately nine-acre drainage basin contributes water to the general area around the base of Chair 6 at Golden Peak. The watershed limits consist of the natural ground break which runs roughly along the Chair 6 alignment on the east, waterbar 10 on the south, the access road to the west of Chair 12, and the Golden Peak base area on the north. The drainage area is primarily grass covered, trees, bare or fallow (over ninety percent) with the remainder consisting of assorted small buildings, an old foundation, some paving and Chair 6 infrastructure. The primary drainage route for this area, and for water collected and concentrated by waterbar 10, is the borrow ditch along the east-side of the access road that crosses under Chair 6 near the base of the ski slope. Runoff from the borrow ditch flows across the paved path to a sump and storm drain located under and just above the base of Chair 6. The secondary drainage route for this area is via diffuse flow from southwest to northeast across the center of the drainage area, then across the paved path at a second location and to the sump under Chair 6. Water concentrates at this grated sump storm drain under Chair 6 and is conveyed to Mill Creek via a storm sewer. It is important to note that some of the general area above the base of the ski slope is bare ground due to recent disturbance by equipment traffic and construction staging activities. In some areas, the aforementioned access road and borrow ditch are not well defined,but it appears that a portion of the borrow ditch has recently been re-graded to convey water into Mill Creek above where it enters the large underground culvert. This Policy Analysis • Engineering • Environmental Assessment • Information Systems 1002 Walnut, Suite 200 • Boulder, Colorado 80302 U.S.A. • (303) 443-7839 • TeleFax (303) 442-0616 P.O. Box 445 • Socorro, New Mexico 87801 U.S.A. • (505) 835-2556 • TeleFax (505) 835-2609 ' Chair Six Stormwater Management Improvements functions as a drainage feature that can be temporarily depended upon to take water out of the drainage basin and reduce the amount of drainage into the sump and storm drain located below Chair 6. It is our understanding that the construction staging activities in this area are temporary and the long-term land use will be skiing and recreation. Drainage Improvements The purpose of the stormwater management recommendations outlined in this letter is to reduce ground surface and ditch erosion from the drainage area described above. The best management practices needed for this area consist primarily of drainage improvements designed to establish permanent stable drainage pathways and to reduce the concentration of flows to the storm drain located at the base of Chair 6. In addition, the revegetation of bare ground areas and stabilization of the access road surface will result in improvements to water quality and the aesthetic appearance of the area. The primary need for long term resolution of these issues is to complete a simple drainage management plan for this area that is compatible with the manner in which this area i"s and will be used. The conceptual components of this plan are outlined in the following bulleted items. An attached plan drawing schematically shows the features of this plan. Ground survey and a preliminary engineering study should be completed to confum the feasibility of this conceptual plan, to refine its specific components and to provide a construction cost estimate before proceeding to implementation. • The major defining ground feature in this area is the access roadway. The precise horizontal and vertical alignment for this roadway needs to be established. For current purposes we will assume it will follow the cuxrent general alignment. A suitable geometric cross section, including an adequate road structure (an aggregate base course on an adequate sub-base is assumed) is needed along this route in order to have reliable vehicle access. That cross section should have a defined east edge rock lined borrow ditch to provide drainage for the roadway and to receive drainage collected from waterbar 10. That borrow ditch would carry flow to the northeast along the current roughly formed drainage path alignment. • The borrow ditch should end at a point near where Mill Creek goes underground just upstream of the paved path. At that point the drainage should discharge into a new stormwater inlet, cross the road in a buried storm sewer and discharge into Mill Creek immediately upstream of where Mill Creek goes underground. • Overland flow along the secondary flow path should continue as it does currently until it reaches the other paved path crossing. The grass swale that d;ains this area will be revegetated as necessary as part of overall revegetation of the drainage area. Up gradient of this point a new stormwater inlet should be constructed to collect this water. The collected water should then be routed to the new stormwater inlet described in the preceding bullet via a buried storm sewer. That storm sewer will likely need to have an intermediate manhole to Hydrosphere Resource Consultants, 1002 Walnut Street Suite 200,Boulder, CO 80302 Page 2 � Chair Six Stormwater Management Improvements maintain a straight alignment between access points. Water from both the primary flow paths will join at the aforementioned stormwater inlet and flow to Mill Creek. • The remaining unaccounted for water will continue to drain from the much reduced drainage area in the direct vicinity of chair lift 6 to the previously . described existing stormwater inlets under the chair lift. This reduction in flow to these inlets will provide effective water handling, allow the sediment to be cleaned up from this area, the surface of the ground to be regraded and the area relandscaped as desired. • The drainage area ground surface can then be regraded as needed and revegetated to minimize erosion and sediment discharge to the adjacent drainageways. Vegetated areas should remain free of vehicle access in order to preserve an aesthetic, naturally permeable and erosion resistant vegetated surface. This described conceptual plan should result in significantly improved stormwater quantity and quality handling. It accomplishes this at a reasonable cost and with the flexibility to be expanded or modified to be consistent with most future land uses for this area. We look forward to receiving your feedback to these ideas and to proceeding to the next stage of implementation. Sincerely, Hydrosphere Resource Consultants, Inc. by: Do glas R. Laiho, P.E. Senior Water Resource Engineer Enclosure cc: Dave Tucholke, Vail Resorts Bill Carlson, Town of Vail Bob Weaver, Hydrosphere Hydrosphere Resource Consultants, 1002 Walnut Street Suite 200,Boulder, CO 80302 Page 3 � � . _ . . . , �.�...,�.� ______. 94��{7 F 1. 7'�� i ' � � � � � � �1,��r u 4 i d �m V�(� � a � � . /= . / t I 'i�t � . C . J . �'+r�'9 1 ' r I � . � I� ' ��1 I� . � f�� I � �3 f �. ! ! 2 Y 1 / 4 r � � � i � i . � . . , . . , � . '�. . � a t . � � � � � � � ' + �� . 1 '.. . � ,� � � � . �� . a - � L � f `:� . / � � t � � � ��_ �{ � , i � . ./ ' �f � . � . ..... ... , i\ . �. i �, :_ � . '✓ l�.! . , i . . . ._.� d .y i � � � . 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Box 7 Vail, CO 81657 RE: Vail Mountain/Golden Peak Stormwater Improvements Dear Paul: This letter report is a follow-up to my recent site visit and presents our updated and more detailed thoughts/recommendations for the stormwater improvements, a portion of which are currently under construction. GENERAL On Monday, June 27th, I conducted a site visit to the Golden Peak area at Vail Mountain to observe the progress of work underway on the installation of erosion control measures and restoration of areas where erosion has occurred. This memo reports the conditions that I observed at the site and provides some additional recommendations for refinements of the BMPs described in the letter of June 20, 2005 from Bob Weaver. We are also recommending an additional drainage improvement for the area above waterbar 4 that was not included in Bob Weaver's letter. Please note that waterbars 1, 2, 3 and 10 had not been worked on at the time of the site visit and are generally not further addressed, except to provide the additional details described in Bob Weaver's June 201etter. SPECIFIC CONSTRUCTION RELATED COMMENTS The attached plan view drawing and details should be referred to as needed for full understanding of the bulleted comments that follow. The enumerated locations in the narrative descriptions refer to specific locations on the plan drawing and lettered details refer to specific standard details related to each locatio�. The details and engineering related information are the result of a response to field conditions using engineering judgment in combination with the need for practical and economical solutions, versus detailed engineering evaluations and designs. They are provided in this fashion to facilitate prompt completion of construction and prompt revegetation of the subject areas. Policy Analysis • Engineering • Environmental Assessment • Information Systems 1002 Walnut, Suite 200 • Boulder, Colorado 80302 U.S.A. • (303) 443-7839 • TeleFax (303) 442-0616 P.O. Box 445 • Socorro, New Mexico 87801 U.S.A. • (505) 835-2556 • TeleFax (505) 835-2609 Vail Mountain/Golden Peak Stormwater Improvements • Area 1 is the highest work area and is located immediately adjacent to the main access roadway. The most up gradient waterbar 1 should be moved approximately 20 feet down from the alignment indicated in Bob Weaver's letter to the toe of the steep slope. Ski axea personnel have indicated that this slope does not hold snow very well and the proposed waterbar could create a skier hazard. The realignment will also avoid disturbance of the areas on the steep slope where vegetation is well established. • Area 2 is the discharge point for waterbar 2. The outfall for waterbar 2 should be constructed in accordance with Detail A and with a discharge point flush with existing vegetation in the swale at this location. • Area 3 is located on the catwalk access road above waterbar 4. Water needs to be controlled in this area to keep it off the slope above waterbar 4. The east side borrow ditch needs to be regraded on a uniform slope to a minimum depth of one foot to contain flow off the road and from the wooded area to its southeast. The existing shallow diagonal cut across the caiwalk just above the top of the slope should be deepened sufficiently to collect water flowing north along the road to the east borrow ditch and away from slope above waterbar 4. • Area 4 is the edge of slope at the west end discharge point of waterbar 4. The unvegetated edge of the fill slope to the edge of the existing vegetation should be regraded to remove any extra fill and to create a surface that can be revegetated. Revegetation should consist of covering the exposed fill slope with a premanufactured coir double jute blanket (or equivalent), stapledlstaked in place in accordance with manufacturer recommendations with revegetation as at other locations. The outfall for waterbar 4 should be constructed in accordance with Detail B using four four-inch pipes. The pipes should outfall into rock along the narrow bench at the toe of the exposed fill slope. Additional rock for this purpose can be selectively moved from the pile of rock immediately up gradient. The rock should be placed to dissipate the energy of the flowing water from the ends of the pipes and spread the water so it can flow down the slope in sheet flow fashion. • Area 5 is the discharge point of waterbar 5. The outfall for waterbar 5 should be constructed in accordance with Detail B using four four-inch pipes and with a discharge point flush with existing vegetation. • Area 6 is the discharge point of waterbar 6. The outfall for waterbar 6 should be constructed in accordance with Detail B using three four-inch pipes and with a discharge point to the existing rocks at this outfall just inside the existing vegetation. • Area 7 is the discharge point for waterbars 7 and 8. The outfall for both waterbars should be constructed in accordance with Detail B using three four- inch pipes and with discharge points flush with existing vegetation. Hydrosphere Resource Consultants, 1002 Walnut Street Suite 200,Boulder, CO 80302 Page 2 Vail Mountain/Golden Peak Stormwater Improvements • Area 8 is the discharge point for an unnumbered waterbar located between waterbars 8 and 9. The outfall for this unnumbered waterbar should be constructed in accordance with Detail C with a discharge point flush with existing vegetation. • Area 9 is the discharge point for waterbar 10. The outfall for waterbar 10 and the slope drain just above Chair 12 will discharge directly to an improved rock lined borrow ditch(to be described in a separate letter)which will run along the east edge of an improved gravel access road to the general area of the base of Chair 6. The slope drain may need a separate pipe or swale crossing of the existing gravel access road to the borrow ditch or waterbar 10. Area 10 also includes several separately defined and integrally related drainage improvements to control water in the direct vicinity of the base of Chair 6. GENERAL CONIMENTS • The waterbar spacing and grades look generally good and the resulting slopes between waterbars have been regraded nicely in those areas where work has occurred. • Construction activity has avoided disturbing slope areas, which were not rilled and new vegetation is becoming established. Rilled and slope failure areas have been nicely regraded to receive revegetation. Revegetation should occur as soon as the necessary slope reconstruction is complete in order to give the revegetated areas as much growing time as possible. MISCELLANEOUS COMMENTS • We are depending on the existing native ground cover and woody vegetation between the west boundary of the subject ski run and Mill Creek to provide slope erosion control for water once it is discharged off the ski slope. Accordingly, care should be exercised to not disturb this slope or deposit material on top of the native vegetation. The material which has been pushed onto this slope from waterbar construction and other related activity should be removed to the extent possible down to native material at all locations. • The waterbars should be cut a minimum of one foot and preferably two feet deep across the slopes. We understand that the generally one foot deep waterbars that are being cut are that deep so they do not constitute unacceptable hazards to skiers. These shallower waterbars will require hand shaping, compacting, etc to achieve a more precise shape that will convey the water without overtopping or breaching. We believe that implementation of the measures described in Mr. Weaver's letter of June 20, 2005, with the refinements recommended in this letter, should effectively address the erosion and drainage problems that occurred at Golden Peak during this spring's runoff. Follow-up inspections will be important to make sure that these improvements are in good repair and functioning properly. Hydrosphere Resource Consultants, 1002 Walnut Street Suite 200,Boulder, CO 80302 Page 3 Vail Mountain/Golden Peak Stormwater Improvements We trust that this is the information you require at this time. Please call for more detail or any clarifications. Sincerely, Hydrosphere Resource Consultants, Inc. by: glas R. Laiho, P.E. S nior Water Resource Engineer cc: Dave Ozawa, U.S.D.A. Forest Service William Carlson, Town of Vail Enclosures , Hydrosphere Resource Consultants, 1002 Walnut Street Suite 200,Boulder, CO 80302 Page 4 Hydrosphere Date Sheet of 1002 Walnut, Suite 200 � Boulder, Colorado 80302 Proj. Na Tel. (303) 443-7839 Proj. Name Fax (303) 442-0616 Des. By Ckd. By Subject � � � � � Z � � � � � �1� ��. tl _ � �� : � � � � � � �� ; �� ' U � � � � � �� s — vl y� - � � � -� Z N . � � � � � �, � � I i� � s � �, - ✓ � �1 c,�, � � . � � 3 � Z ,, � � � � � � � � � �� , � � � � r � � `� z z � @ , a � � n 'i � � � � � �_ .� � � � � � Hydrosphere Date Sheet of 1002 Walnut, Suite 200 Proj. No. Boulder, Colorado 80302 Tel. (303) 443-7839 Proj. Name Fax (303) 442-0616 Des. By Ckd. By Subject � ° �, � � � � � � r � � � rn � � � � � s � � � y �. � � � �' �, b � � _ Q � T � � � � � Z�' �, � 3� ': � � f� � • � � � � � � � � � � � b � � � � � �` � o � � � � � � �n `� � � � � � ,,.E "�' ` "� � q � � � � � � � � � � � � � � . 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Carlson,REHS 970-479-2138/479-2139 Environmental Health Officer FAX 970-479-2452 June 22,2005 Dave Tucholke, Supervisor Grooming and Snow Making PO Box 7 Vail, CO 81657 RE: Facility Follow Up Inspection Vail Ski Area Permit COR03-0541 Town of Vail Dear Mr.Tucholke: A follow-up inspection of the above-referenced facility was conducted by the Town of Vail on June 21,2005. The inspection procedure consists of two parts: a review of records,and an on-site facility inspection. Findings associated with the inspection are detailed in the enclosed inspection report. You must correct the findings noted in the enclosed inspection report, submit an explanation on how each finding was corrected, and submit the requested materials to the Town of Vail,75 S. Frontage Road,Vail,CO 81657 and to the Colorado Department of Public Health and Environment,WQCD-P-B2,4300 Cherry Creek Drive South,Denver,CO 80246-1530; Attn: Matt Czahor by July 21,2005. For facilities covered under a Colorado Discharge Permit System(CDPS) general permit, failure to comply with any CDPS permit requirement constitutes a violation of the Federal Clean Water Act and the Colorado Water Quality Control Act,25-8-101. If you have any questions,please call me at(970)-479-2333. Sincerely, To il �" William T. Carlson,REHS Environmental Health Officer Enclosures cc: Matt Czahor,Water Quality Control Division File Copy Stormwater Ins ection Re ort Permittee:Vail Associates, InC. Cert.No. COR03-0541 Date:06/21/2005 Facility:Vail Ski Area Industrial Type:Construction Receiving Water: Gore Creek Facility Address: 495 Vail Valley Dr., Vail, Colorado 81657 Persons present: Dave Tucholke, Paul Fillion,Brian McCartney, Vail Resorts Facility Representative(s)/Title(s): Mountain OpeTations �nspector:Bill Carlson, Town of Vail Follow Up Inspection Findin�s Records Review . 1. Mountain maintenance and project activities began after April 17,2005. The Stormwater Management Plan(SWMP) and sedimentation control site plan has been revised by Robert Weaver,Hydrosphere Resource Consultants,Inc. and � available for review. The drainage and erosion control measures described in th�revised SWNIP cover Vail Mountain at Golden Peak focusing on the area below the half pipe down to the upper terminus of chair lift No. 12. The civil engineering drawings in the revised SWMP illustrate BMPs for this area consisting of grading of slopes to eliminate slumps and rilling,revegetation of disturbed areas, installation of additional waterbars,reconfiguration of several existing waterbars,and other measures to disburse runoff and reduce erosive energy. These BMPs are designed to break up run off flow volume in a network of waterbars reducing erosion forces. All grading,waterbar installation and revegetation is expected to be completed by July 4,2005. A post construction report will be submitted by Hydrosphere Resource Consultants,Inc. confirming completion of all BMPs at the Golden Peak location. 2. Inspection records were available and performed every day or after a snow or rain event. Inspections of BMPs must be conducted weekly during construction of the improvements discussed above to assure erosion and sediment controls are properly maintained. Inspections must continue and be conducted every 14 days,except during winter snow pack conditions where no melting is occurring,or when all construction activities are completed. When all construction activities are completed but final stabilization has not been achieved due to a vegetation cover that has been planted but has not become established, inspections must be conducted at least once a month. Facilitv Inspection Note: All BMPs mentioned in the below findings must be installed according to specifica�ions and design criteria outlined in the revised SWMP. These specifications and design criteria must meet best engineering practice requirements. GOLDEN PEAK SKI YARD 3. It was noted during the inspection that waterbar BMPs have been marked at locations described on the site map and are cunently under construction to prevent off site discharge of sediment from the base of Golden Peak ski area. BMPs must be properly installed according to the specifications outlined in the SWMP. 4. Adequate BMPs must be implemented to prevent the discharge of sediment from Golden Peak ski yard. 5. It was noted during the inspection that vegetative growth was observed on the Golden Peak ski slope. LOWER BORN FREE AND FOREST ROAD 6. It was noted during the inspection that BMPs have been construction at lower Born Free and Forest Road to prevent the discharge of sediment into Gore Creek. Silt fencing, straw bales and road tracking control measures have been properly installed according to the specifications outlines in the SWMP. /�i�1 ; �-- � ---. . tormwater Ins ection Re ort Permittee:Vail Associates, Inc. Cert.No. COR03-0541 D Faciliry:Vail Ski Area Industrial Type: ConStruCtlon Receiving Water: Gore Creek Facility Address: 495 Vail Valley Dr., Vail, Colorado 81657 Persons present: Dave Tucholke, Paul Fillion,Brian McCartne , Vail Resorts Facility Representative(s)/Title(s): GroOming/SnoW Operatlons �nspector:Bill Carlson, Town of Vail Follow Un Inspection Findin�s Records Review l. Mountain maintenance and project activities began after April 17,2005. The Stormwater Management Plan(SWMP) and sedimentation control site plan has been revised in a report received from Robert Weaver,Hydros he�re and was available at the site for review. The drainage and erosion control measures described in the revised�`� ' eover Vail Mountain at Golden Peak focused on the area below the half pipe down to the upper terminus of chair lift No. 12. The civil engineering drawings in the revised SWMP illustrate BMPs for this area consisting of grading of slopes to eliminate slumps and rilling,revegetation of disturbed areas,installation of additional waterbars,reconfiguration of several existing w��terbars,and other measures to disburse runoff and reduce erosive energy. The BMPs detailed in the revised SWMPya designed to break up run off flow volume in a network of waterbars reducing erosion forces. 2. Inspections of BMPs will be conducted weekly during construction of the improvements discussed above to assure temporary erosion and sediment controls are properly maintained. Inspections must continue and be conducted every 14 days, except during winter snow pack conditions where no melting is occurring, or when all construction activities are completed. When all construction activities are completed but final stabilization has not been achieved due to a vegetation cover that has been planted but has not become established, inspections must be conducted at least once a month. Facility Inspection Note: All BMPs mentioned in the below findings must be installed according to specifications and design criteria outlined in the S WMP. These specifications and design criteria must meet best engineering practice requirements. GOLDEN PEAK SKI YARD 3. It was noted during the inspection that BMPs were not maintained to prevent the discharge of sediment from the base of Golden Peak into the large stormwater sewer drop inlet. BMPs must be implemented to prevent the discharge of sediment from the Golden Peak sky yard area. BMPs must be properly installed according to the specifications outlined in the SWMP.. 4. It was noted during the inspection that sediment is entering the Golden Peak stormwater sewer inlet and discharging into Gore Creek at the Manor Vail sewer outlet. A sediment cloud in Gore Creek has formed at the outlet forming a plume downstream from the outfall. BMPs must be implemented to prevent the discharge of pollutants into Gore Creek from the stormwater outlet. 5. It was noted during the inspection that sediment is entering the stormwater drain inlet under chair 6. Adequate BMPs must be implemented to prevent the discharge of sediment from Golden Peak ski yard. A clean up procedure and BMP update of the Stormwater Management must be submitted. 6. It was noted during the inspection that adequate BMPs where not properly installed at the Mill Creek inlet to prevent the discharge of sediment into Gore Creek at the Covered Bridge outfall in Vail Village. This has contributed to the cloudy water from the Covered Bridge to Lionshead. HYDROSPHERE Resource Consultants June 20, 2005 Mr. Paul Fillian Vail Resorts P.O. Box 7 Vail, CO 81657 RE: Vail Mountain/Golden Peak Stormwater Best Management Practices (BMPs) � Dear Paul: In response to your request, this letter and the attached map provide instructions and �, guidelines for the implementation of additional stormwater drainage and erosion control BMPs for the ski slope at Golden Pea.k. The recommendations outlined herein are based upon primarily on field observations from site visits conducted on May 16, May 21, June 8, and June 15 by Doug Laiho and/or myself. We have also considered comments received from Forest Service and Town of Vail representatives, recommendations � regarding geotechnical issues from Koechlein Consulting Engineers (see attached letter of June 16,2005), BMP applications from the Vail Stormwater Management Plan, and Infrastructure Standards and Guidelines from the White River National Forest Land and Resource Management Plan. Please note that the BMP descriptions in this letter will be subject to some modifications and refinements and are intended to serve as general instructions rather than precise design specifications. The drainage and erosion control measures described below cover the area below the half pipe down to the area around the upper terminus of Lift No. 12. The appropriate BMPs for this area consist primarily of grading the slopes to eliminate slumps and rilling, revegetation of disturbed areas, installation of additional waterbars, reconfiguration of some existing waterbars, and other measures to disburse runoff and reduce erosive energy. The locations of the waterbars described below are shown on the attached map (Figure 2) and have been marked and labeled in the field with lath stakes. The labels on the stakes are keyed to the map (Waterbar No. 1 below=Bar 1 on the map, etc.). 1. Areas where slope erosion has occurred will be regraded and revegetated in accordance with the applicable instructions in the Vail Stormwater Management Plan (SE Group 2005). Following the application of seed and straw mulch to these areas, the straw should be anchored into the soil, as illustrated in Figure 1. 2. Re-grade and extend the existing Waterbar No. 1 across the ski slope in the area just above the relatively flat section of the slope as shown on the attached map (Figure 2). Install a short riprap rundown to the existing roadside ditch and culvert. Policy Analysis • Engineering • Environmental Assessment • Information Systems 1002 Walnut, Suite 200 • Boulder, Colorado 80302 U.S.A. • (303) 443-7839 • TeleFax (303) 442-0616 P.O. Box 445 • Socorro, New Mexico 87801 U.S.A. • (505) 835-2556 • TeleFax (505) 835-2609 Mr. Paul Fillian June 20, 2005 Page 2 3. Realign the lower half of the existing Waterbar No. 2 so that its lower terminus is about 25 feet up-slope from the existing terminus, and extend the channel into the woods about 20 feet to an existing drainage swale. Install a small riprap basin(4 to 5 feet in diameter) to dissipate energy. 4. Install new Waterbar No. 3 extending about 3/4 of the distance across the ski slope (from the west edge of the ski slope to the east) so that flow from the existing waterbar that slopes to the east is intercepted and routed back off the ski slope to the west. Install riprap apron at the lower end of Waterbar No. 3 to dissipate energy and spread flow. 5. Install new Waterbar No. 4 extending from the east edge of the slope to the base of the existing catwalk. Place a small earthen berm at the end of the catwalk so that flow from the catwalk is directed into the new waterbar. The eroded area at the lower end of Waterbar No. 4 should be regraded, reseeded, and covered with erosion control blanket. This new waterbar will intercept runoff from the catwalk and axeas above and below the catwalk that currently flow into the existing large waterbar that doubles back from the center of the slope. At the west end of Waterbar No. 4, a pipe or riprap rundown will be needed to convey water down to the rocky bench adjacent to Mill Creek and to prevent erosion of the steep slope above the stream. 6. Realign the existing large waterbar(Bar 5 on Figure 2) to the area below the rock ledge outcrop and above the snowmaking tower at the center of the ski slope. Construct a riprap apron at the lower end of the waterbar to dissipate energy and spread the flow over the slope down to Mill Creek. Note that this waterbar overflowed and was breached during runoff in mid-May, which was the primafy cause of the erosion problems that occurred on the ski slope below. All of the new waterbars and drainage improvements described above will help to reduce flows into Waterbar No. S. 7. Install new Waterbar No 6, to be located about 125 feet below and approximately parallel to Waterbar No. 5. Extend Waterbar No. 6 from the west edge of the slope to the area just above thE snowmaking tower on the west edge of the terrain park, as shown on Figure 2. 8. Install new Waterbar No. 7, about 100 feet below Waterbar No. 6, and extend it to the west edge of the terrain park splitting the drainage areas between Waterbar No. 6 and the existing Waterbar No. 8. Construct a riprap apron at the lower end of the waterbar to dissipate energy and spread the flow over the slope down to Mill Creek. 9. Extend the existing Waterbar No. 8 to the east into the area below the terrain park. 10. Realign the lower section of the existing Waterbar No. 9 so that it terminates about 20 feet upslope from the existing alignment. Install a culvert rundown to the roadside ditch. The existing roadside ditch and the channel below the road down to Mill Creek should be lined with Mirafi filter fabric and riprap to prevent any further channel erosion. 11. Extend the existing Waterbar No. 10 from the roadside ditch across the ski slope to the east, crossing under Chair 12 and extending into the area above the tunnel terrain feature. Hydrosphere Resource Consultants,Inc.,1002 Walnut Street,Suite 200,Boulder,CO 80302 Mr. Paul Fillian June 20, 2005 Page 3 Again, it is important to note that the measures described above and on the attached figures are intended to guide the installation of additional waterbars and other drainage and erosion control improvements in the Golden Peak area. I expect that the configurations and locations of these features will be modified somewhat in response to conditions encountered during construction and in accordance with professional judgement. The design requirements for the conveyance of runoff from the ski slope down to Mill Creek will be further refined based upon the attached comments received from William H. Koechlein. We will assist ski area personnel during the installation of the measures described above by providing more specific and detailed design specifications as needed for rundowns, waterbar sizing,pipe sizes and other details. As specified in the Vail Mountain Stormwater Management Plan, on-site inspections should be conducted at least weekly during construction of the improvements described above to assure that temporary erosion and sediment control measures for construction are properly implemented and maintained. Following construction, inspections must be conducted at least monthly until vegetative cover becomes established or until snowpack without melting has occurred. Observations from these inspections and any resulting maintenance directives should be documented in writing and these records should be available for inspection at the appropriated Vail Resorts office. In addition to the inspection requirements in the Stormwater Management Plan, I recommend that an overall inspection of both temporary and permanent stormwater BMP's be conducted in the late fall. This will help to assure that such control measure are in good repair and operational when the snow begins to melt in the spring. � Please let me know if you have any questions and/or comments. I look forward to working with you on the implementation of this plan. Sincerely yours, Hydrosphere Resource Consultants, Inc. by: �g��u�� Robert M. Weaver Enclosures: Koechlein letter of June 16, 2005 Figure 1 — Straw Anchoring Figure 2—Map showing waterbar locations cc: William Carlson, Town of Vail Dave Ozawa, U.S.D.A Forest Service Bill McKee, Colorado Water Quality Control Division Dave Tucholke, Vail Resorts Brian McCartney, Vail Resorts Hydrosphere Resource Consultants,Inc.,1002 Walnut Street,Suite 200,Boulder,CO 80302 ��----=r 06/17/2005 06:55 3039890204 KOECHLEIN ENGINEERS PAGE 02 Koechlein Consulti:ng �ngineers, �n�. Consuiting Geotechnicaf Engineers � 12364 W. A[ameda Pkwy • Suite 115 • Lakewood, CO 80228-2845 wtx�vv.KGE-D enver.coz�a LAKEWOOD AVON/SILVERTHORNE (303) 989-1223 (970) 949-6009 (303) 989-0204 FAX (970) 949-9223 FAX :lua�.e 16,2005 Mr. PauJ Pil�xon Vail,El.ssociales,lnc. P.O. Box 7 Vai�, CO 81658 � Subject; Slo�e Stability a��ci Water Bar Const�uction � Goldea�Peak Ski Slope Vail Ski Area Vail, Colorado Job No. 05-085 A,s request�d, an e��gi�aeer from our office observed tlie existing Golden Peak Ski sLope and the slo�e betwean tlae ski. slope a�xd Mill Creek on Vai( Mountain on June 14, 2005, The purpose of our obseivation was to delernli»e tbe stab�lity oftt�e existi�ag slopes afte►•tbe coaastructio�a of t�ew watier bat's aeroas the ski slope a�1d t�te stability of tlae slope between th� ski slop� and Mill Cr�ek. Tlie purpose of tliis letter is to prese��t our obset-vations of il�e slopes, our undeXStanding of tbe project, ouc conclusions with regard to the stability of tl�e slopes, a�id oux reco�x��'�e��datxo�.s witl�rega�d to tlae cotastru.ction of the watet�bars. As p►-�viously �nentioned an engineer fron� our office o6served the existing slop�s o.n June 14, 2005. Gold�x� �'eaic Slci slope was obse�ved fro�x� approz�inaately tb.e bridge crossx��g Mill Ca-�e�C up the slope appxoz�ixx�atel.y 300 yards. T.t�ree water bars were obscrved traversi�ag tliis scctio�i of tl�.e ski sl.ope£roalx east to west. T(�e water bars d�-axn�d dowz� towards tlae xavi�.e between t(ae ski sJ.ope and .Mill. Creck. The watcz bars we�e approxilx�at�Jy 18 to Z4 inches in widtl� at�d appeared to have been bre�ched along the west edge adjacent to tlxe sJope dotiv�x towards Mill Creek. Isolated areas o�s��,a]low slo�e failures oc s(umps were observed on the ski slope. No glol�al slope failuxes were observed o� the ski slope. �I�e sluxnps wexe beit�g xepaired at the tiine of tl�is observat�on- No v�getation was observed on tLle ski slope bowever, it appeaxed tb,at t1�.e s�Ci slope has been sEeded apd mulcl�ed witb.straw. � The sJope betweez� the ski sJ.ope atzd Ivlill Creek gen�rally slopes steeply dow►t tovti+ards M.i�l Creek. An isolated I arca along t11is slope is geneca�J� �eve� witla a very slight slope d.own to'wa�ds Mill Creek. Large cobbles ai�d bou�de�s were obs��•v�d oi� tl�e sur�ace of tlais slope. No iz�dicatio�� of slop� failure was obse�ved aio�ag this slope wheze water£�-oan the watez-bar had been flowing down the slope, VegetaEion on the slope betweea�a tl�e ski slo�e and Mill Creek consisted of Aspen trees, Piz�e trees, grasses, sla�'ubs, attd weeds. � B�;cause i�o g1,Oba( slope f.aiJures wexe obsexved o�� the existii.z�g ski slope a�nd no dee� �'ield i.nvestigation. wa5 pet�fori�ned, a formsl global slop� stabili,ly aqalysis was not �ei-£o�xaaed for eit��ec tt�e ex,xsti��g slci slope or the sl.ope beriveen the ski slope and �v[ill Creek. ,f1, �o,rmal g�oba� s�ope stabxl�ty ax�alysxs would coa�sist o�a d�ep subsurface inv�stigatioza and cozx�puter�nodeliug in orde��to detern�i��e tlle fa.ctor of safety with respect to slope failure of the existing slopes. k�owevet, based oz� our obseXVa.tiox�s, it is ou�-opiaion tliat a gl.obal slope stability anal�sis wouJd not be ��,ecessary £or tl�e two slopes. lt is oua� opinion that tL1e blobal stability of the slopes will not be greatly reduced by t�te co.tzsl'tuction o£tl�.e wa.ter ba�-s. - — �".- . . - -- - — � - - - - 06/17/2005 06:55 3039890204 KOECHLEIN ENGINEERS PAGE 03 M'f.Paul FzlJion ,KOEGFlGLIN CONSULTING ENClN�GRS,,(NG . June �6,2005 Coiisultirtg Gentechnr.cat E�tglneerS Job No.OS-085 Page 2 of 2 �Iowever, isolatEd ace�s of'sl�aJlow slope fa.i(uras or slumps ai�d/o1' excessive e�•oszo� could develop if certain. ' pcecautior�s are not taken with rega,rd to cotastxuction of the wat�r bars, Shallow slo�e fa�l.u.ces ox sluzx�ps are ' caus�d by the moisture contet1t o�tbe so�ls i��czeasing wl�ich reduces tlte strength of the soi.ls_ Based oz� our � observatioAts of t1�e e�istz�g sk� slope condations, it i5 our opinion that area draj.l1ed by tb� EX�SYza�g wate�� bars was too laxge to pxovide posilive surface drain.age of tl�e snowmelt. Tt1is resulted in the ut�derlyit�►g soi�s beconling satu.rated, losing stren�;tk�, at�,d�aAl��g. We u�de�-stand tk�at additional water bars will be coa�structed actoss the ski slope to reduce Cbe d�-aia�age acea of e�ch individual water bar. Tlie water bars wj►1, be sloped do� towards the sl�pe betweezi t��e skz atea a�ad Mi11 Creek. i ata oxder to reduce the risk of shallow slope failui•es and excessive et•osi.ot�, we [ecomtx►end that the .following I iteins be considered with regard to the design and constructio» of tl�e ptroposed water bars. , I 1., bacreasin� the nunnber of water bars, as plana�ed, will reduce tl�e drainage ar.ea and will l�elp reduce tlae cis(c of tLae ski sJope soils beeoaning saturated a��d eausing shallvw slope faiiu�res atad pvssib�e breachi►�.g. 'I 2. The wateX bacs should be designect wi,tb positive drainage �rl order to reduce�1te risk o�wateX po��dittg ia the water bars and satuz-atia�g the unde�-lying soils. ' 3, Whera the water bars exit onto the slope between the ski slope and Mill Creek, we recommoald that a ' ' S £oot loiag section dowx� the slope be arinored wi�la rip rap in.ozder to nainiumize the risk o£erosion of ' this t�-ans�tio�� and he1�disperse tl�.e water flowiAig down tlae slope. 4. Wbere t�te watez flows along tbe f]atter sectio�►s of the slope bet�veea� tlte ski s).ope aztd M.ill Cz'eek, we recomznend t.6at the water be controiled in a shallow channel in order to direct the flow of water and reduce tl�e.rislc of the unde�•Iyi�ag soils becomi��g saturated. We appteciate t�ae opportu�ti.ty to p�ovide t�1is se�vxce, ,Lf we can be of fu�tl�er assistance, please contact our o�ce. KOEC3ILE��I�� }�;,�ING ENGINELR�, I1�C. `` �,oen..o.�js`''/Ii ` O �� ^ ��`- � � �� • � ° ' 33822 ' : � �A. ��` =�,�•�6��1°� •'�.� . • Scott�:]Vf�J��(�1�-��• . .��` Sel�ior Ex�gau��Nnnw►u�u��° Rev�ewed by: � � � � �� i . Wi�lia�z�H_ Koecl�lein, P.E. 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'� , � � � \ �� V� ' �' � , �i � i �' i' i � i ` '� , � � �;�� , �.. ` �� ei�a;ew�o sp�e�(054'lZ t edid�edng _ ' Q , . � , , � , �� a � � ,s , Q � p �� .. � ` � � _ � � �� , Q ��_`— _ _ � , - --- �--�—�—�— __ _ �__`-�� - _ „ �--_. __.--- - --�„-,, � �� _- �-- ,, - �_- „_,-„_ � � � .,,,,,�_ , �l�'J!,'.. .� . , \�� Q �_ � O: � !ill:l�. _...-_ ( �.'.Q �� . , Stormwater Inspection Form (Construction Industrvl Colorado Stormwater Program (WQCD-B2-PE) Phone(303)692-3575 Fax(303) 782-0390 Email: cdpheWQStonn@cdphe.state.co.us General Information Name of facility: VG,� =�S�tL� S CDPS#: CO �-��-�?�`�� Facilit Informatio City: � Q'; � County: � �� Address/Directions: R�� J � C''� i��c_�i Name(s)of Onsite Representative(s): phone: ( ) Permittee If not ermitted Owner r O er tor � Company Name: �'% e. o�/ `- Name of Responsible Official: Title of Responsible Official: phone: ( ) Address: Inspector(s): ��/l ��=��'d c� Persons present: Inspecting Agency: Date conducted: �/ �--�/ p� Pictures Taken? Yes � No Records Copy of SWMP confirmed on site? Yes No SWMP Review: 1. Site description as required in the permit? Yes No Notes: 2. Site map as required in the pennit? Yes No Notes: 3. BMPs for stormwater pollution prevention: a. Erosion and sediment controls as required in the permit? Yes No Notes: b. Materials handling and spill prevention? Yes No Notes: 4. Final Stabilization and long term stormwater management as required in the permit Yes No Notes: 5. Other controls as required in the permit? Yes No Notes: 6. Inspection and maintenance as required in the permit? Yes No Notes: Inspection records kept? Yes No Inspections conducted as required in the permit? Yes No Notes: Construction start date? i � Storm�vater Inspection Form (Construction Industry) Page 2 Site Ins ection BMPs implemented for sediment control? Yes No Notes: BMPs implemented for erosion control? Yes No Notes: � BMPs implemented for materials handling, spill prevention, and spill cleanup? Yes No Notes: BMPs implemented for good housekeeping? Yes No I Notes: � � �I BMPs implemented for inspection and maintenance of stormwater management devices? Yes No Notes: BMPs implemented for vehicle tracking control? Yes No Notes: Evidence of offsite transport of sediment or other pollutants? Yes No I Notes: Evidence of offsite transport of sediment or other pollutants reaching state waters? Yes No Notes: Evidence of discharges other than stormwater? Yes No Notes: Comments: �l�� l � � l/ ' � ,� � i ,,.� ��, . i— -- � n. ( � � ,'�'fi 1_.'+�- ��-'-GJ �--'_�#�.N `°�-e^��.� � �.�/ , �,r;�. /i �',�C�d� —_ 1 .� '�,I', !� /� � � ,\JL � � �� _ ,_ .. � �'� '� , n � �l� �� -�� ' '-' � �,� �,;...� �,�:,. _ T.� � — , _ � � ��, ' � � ��! � 1�� 1'� �� June 20,2005 �� Mr.Paul Fillion Vail Resorts P.O. Box 7 Vail, CO 81657 RE: Vail Mountain/Golden Peak Stormwater Best Management Practices (BMPs) Dear Paul: In response to your request, this letter and the attached map provide instructions and guidelines for the implementation of additional stormwater drainage and erosion control BMPs for the ski slope at Golden Peak. The recommendations outlined herein are based upon primarily on field observations from site visits conducted on May 16, May 21, June 8, and June 15 by Doug Laiho and I. We have also considered comments received from Forest Service and Town of Vail representatives, recommendations regarding geotechnical issues from Keochlein Consulting Engineers (see attached letter of June 16,2005), BMP applications from the Vail Stormwater Management Plan, and Infrastructure Standards and Guidelines from the White River National Forest Land and Resource Management Plan. Please note that the BMP descriptions in this letter will be subject to some modifications and refinements and are intended to serve as general instructions rather than precise design specifications. The drainage and erosion control measures described below cover the area below the half pipe down to the area around the upper terminus of Lift No. 12. The a}�}�ro�riate BMPs for this area consist primarily of rading the slopes to eliminate slumps and rillin�� reve etg ation of dis �reas installation of additional waterbars, reconfiguration of ____.�.. ��ma-�isting waterbars, and.ather measures.to disburse runoff and reduce erosive _ _ . e er . The locations of the waterbars described below are shown on fhe attached map (Figure 2) and have been marked and labeled in the field with lath stakes. The labels on the stakes are keyed to the map (Waterbar No. 1 below =Bar 1 on the map, etc.). 1. Areas where slope erosion has occurred will be regraded and revegetated in accordance with the applicable instructions in the Vail Stormwater Management Plan (SE Group 2005). Following the application of seed and straw mulch to these areas, the straw should be anchored into the soil, as illustrated in Figure 1. 2. Re-grade and extend the existing Waterbar No. 1 across the ski slope in the area just ab�ve the relatively flat section of the slope as shown on the attached map (Figure 2). lnstall a short riprap rundown to the existing roadside ditch and culvert. Mr.Paul Fillion June 20,2005 Page 2 3. Realign the lower half of the existing Waterbar No. 2 so that its lower terminus is about 25 feet up-slope from the existing terminus, and extend the channel into the woods about 20 feet to an existing drainage swale. Install a small riprap basin (4 to 5 feet in diameter)to dissipate energy. 4. Install new Waterbar No. 3 extending about 3/0 of the distance across the ski slope (from the west edge of the ski slope to the east) so that flow from the existing waterbar that slopes to the east is intercepted and routed back off the ski slope to the west. Install riprap apron at the lower end of Waterbar No. 3 to dissipate energy and spread flow. 5. Install new Waterbar No. 4 extending from the east edge of the slope to the base of the existing catwalk. Place a small earthen berm at the end of the catwalk so that flow from the catwalk is directed into the new waterbar. The eroded area at the lower end of Waterbar No. 4 should be regraded, reseeded, and covered with erosion control blanket. This new waterbar will intercept runoff from the catwalk and areas above and below the catwalk that currently flow into the existing large waterbar that doubles back from the center of the slope. At the west end of Waterbar No. 4, a pipe or riprap rundown will be needed to convey water down to the rocky bench adjacent to Mill Creek and to prevent erosion of the steep slope above the stream. 6. Realign the existing large waterbar(Bar 5 on Figure 2) to the area below the rock ledge outcrop and above the snowrnaking tower at the center of the ski slope. Construct a riprap apron at the lower end of the waterbar to dissipate energy and spread the flow over the slope down to Mill Creek. Note that this waterbar overflowed and was breached during runoff in mid-May, which was the primary cause of the erosion problems that occurred on the ski slope below. All of the new waterbars and drainage improvements described above will help to reduce flows into Waterbar No. S. 7. Install new Waterbar No 6, to be located about 125 feet below and approximately parallel to Waterbar No. 5. Extend Waterbar No. 6 from the west edge of the slope to the area just above the snowmaking tower on the west edge of the terrain park, as shown on Figure 2. 8. Install new Waterbar No. 7, about 100 feet below Waterbar No. 6, and extend it to the west edge of the terrain park splitting the drainage areas between Waterbar No. 6 and the existing Waterbar No. 8. Construct a riprap apron at the lower end of the waterbar to dissipate energy and spread the flow over the slope down to Mill Creek. 9. Extend the existing Waterbar No. 8 to the east into the area below the terrain park. 10. Realign the lower section of the existing Waterbar No. 9 so that it terminates about 20 feet upslope from the existing alignment. Install a culvert rundown to the roadside ditch. The existing roadside ditch and the channel below the road down to Mill Creek should be lined with Mirafi filter fabric and riprap to prevent any further channel erosion. 11. Extend the existing Waterbar No. 10 from the roadside ditch across the ski slope to the east, crossing under Chair 12 and extending into the area above the tunnel terrain feature. Hydrosphere Resource Consultants,Inc.,1002 Walnut Street,Suite 200,Boulder,CO 80302 Mr. Paul Fillion June 20,2005 Page 3 Again, it is important to note that the measures described above and on the attached figures are intended to guide the installation of additional waterbars and other drainage and erosion control improvements in the Golden Peak area. I expect that the configurations and locations of these features will be modified somewhat in response to conditions encountered during construction and in accordance with professional judgement. The design requirements for the conveyance of runoff from the ski slope down to Mill Creek will be further refined based upon the attached comments received from William H. Koechlein. We will assist ski area personnel during the installation of the measures described above by providing mare specific and detailed design specifications as needed for rundowns, waterbar sizing, pipe sizes and other details. As specified in the Vail Mountain Stormwater Management Plan, on-site inspections should be conducted at least weekly during construction of the improvements described above to assure that temporary erosion and sediment control measures for construction are properly implemented and maintained. Following construction, inspections must be conducted at least monthly until vegetative cover becomes established or until snowpack without melting has occurred. Observations from these inspections and any resulting maintenance directives should be documented in writing and these records should be available for inspection at the appropriated Vail Resorts office. In addition to the inspection requirements in the Stormwater Management Plan, I recommend that an overall inspection of both temporary and permanent stormwater BMP's be conducted in the late fall. This will help to assure that such control measure are in good repair and operational when the snow begins to melt in the spring. Please let me know if you have any questions and/or comments. 1 look forward to working with you on the implementation of this plan. Sincerely yours, Hydrosphere Resource Consultants, Inc. by: Robert M. Weaver Enclosures: Koechlein letter of June 16, 2005 Figure 1 — Straw Anchoring Figure 2 —Map showing waterbar locations cc: William Carlson, Town of Vail Dave Ozawa, U.S.D.A Forest Service Bill McKee, Colorado Water Quality Control Division Dave Tucholke, Vail Resorts Brian McCartney, Vail Resorts Hydrosphere Resource Consultanis,lnc.,1002 Watnut Street,Suite 200.Boulder,CO 80302 .�� 6> Q 4 — ""-�� ', �';�I °�q� `` , \ ', � p � �' � Q� t3/,: � 1 � � �� -_ :�. . .I,,,:. \\ . � .� .,.. � ---�. \\� � �` ��= -�- � ��— ��`x'�ca�`°��`� � \ _ ��._:.. . — �.'``��- '... r�� . -..__,�—,.._.. '�. �.:.. \ . F.t �1\ \� l �� . @}�t ��3`. �\ �-s�� _ �?� � ` ,` , )! 1 � � � \ . _ .� .�- . d�a � 19 R� :,�. � ��: . �Q� . Q\ �^-w�s* �� :. � PC��n ^ ' I � � �� 'j �C). 3 '" ,1 , �� `t �i ` ` a ;� �` ` �� i, " gf `\ '�� ti r==._.�... -� Super Plpe il `"r�,s.;� I �. ,21 450 Ye�ds af materia �e� l r �� . �� /� '�k� �� _ � _ � _ .i/, �� '{, 1� _ � 3i m'°�, . � � , K} �l � I �, Z„ro ' � ��tl . � � A �ii � . il l ��' !i t, F `� � � ,, � 6 a � �rt E . i� .a�a.�.m� l, A '°�y� �.�� t � ��. q �� , � ,_.� 1 �;� � �„ �� ;� � � � � �� \i �� r. � � �� `��' �a�� //, ` � \'�, Jib Park Fealures .�?�� 31� / .'� ;:C? � �. 4 � 13,000 eNsofmate a6�� ' t � � ent taA�amp �l '2,000 ards o(materia �; \ ,��: �� \\\� , �� :�;� 8er4A °�J � � p v� �� Event�Table?op Jumps � �`� �OOOYaNsoimatedal . ^" ,��. _,�' / ��iv �'i ,\ wt �' 11 � \\� \`. . 1 t 1 �� , e , '�_.---._�._.__ ;� _: p_ y_._ ,.:.. � � H i ,. �' d�o � 1) � �. .�� .�� C��'` i; 1 �t� o �' �}�� `'��^ � r � °� A � C9 c,==��0 ",,y�`.,�,�� . tp �. �� .� � e.', � �,�:� �..� ."�t1�7�� O � ._ . �`a..� �'- � �i•,c �u''=+�� + � L>C', , � j� �[?C""� "�`� �' � ��-'C'�� l p �. � i � �� 3,� � 'z? � `�a� '� c:1 ±Y g�$��,? ? �t?'*� ��p �� ._ ?'�� O §C� .--°�'°'- � y_ � � `�CY �:�` �s3 ��-�-_,�,� `LJ ,:,��'* �� c§�qffi�� Sf97�� f�'� . - �.� ��,cs�. � , ,;.� , � '�� C ,'T. `"' ( �� ' G"�;� K ��`�i L'S81'� 'w� �. —""`..�J� f� G "�`� �� :`°°��.. ? `"'^-a.l 3= -� 4. d � �� ,:: �� r- s:a- ..d . � Figure 2 �� c� o � �� Q �� ,� � �o•cw,mo.r�e�� ,>�. , ,f� � . ', 0 250 500 1000 FT � � � � � - II Scale is Approximate � � -- --- . _ € i T � f�� OBTAfNEO FROM: EROSlON DRAW 2.0 - EROSION AND SEDIMEN7 CONiROL l.IANUAL fOR' �� s L�� ` .. � ��.. � =:r +,^��-'^ s�'x't'�� y _ COMPUTER AtDED.DRAfnNG SAItX—APPLtED.EARTHCARE._REA�tNG CALfFQRNIA�'�'.'�.� i,,< � - `'�}-�rs.-Y�'':..�r�k'�,�.'�%?�`f3 �. . ..��- . �'. . . �- �- _.,—._.._ '�C� . .�'S,,-. e�i <"`�_ . �nt�r�.�.'��.� rfr��r,,�3��`#-°'�ir..�`,c �+-� '.��f1`' � " '�'� �'-�z' s� �.''''��1A��''``•5•,�+��`�'c "f�,i��..�_.�.i'+F4 ��.ror . _ r � J -�'Qi�s5t�.��y�zy,�y.��r�_z:�y�-{�y�,�c''��`-'�`•�.�,,,�.L�c��r.F. ��k-+.,�74 +��. _ �1'v';*i� �-r'�,�.5^9�L��s'�F��ti4--"_ � �- � . Lt. `c. %S��w�'i:,k�.(�! �' K.Tss„_,_�"`}, z:�"�PSy'x3,y'�`�i-��"��'�'�c��'s�" � _ � ' .,!��c i.J'xsi' 3-t "��'�4t�""s ' � �. a� ' 3 _ a� >F �'�%01 ��. �.. ...'?�.�✓i�T-�"�.�r.��!x' �, a �T"i�� .'�.� ,*'i,'�}..* ,C 3, °G. "'ty� ��'s .��.a�'_ r,Fti .�T Ma.�a'iZ''`' t��p G��`J-�`3f-r `C-�.��"�,-�L�,F.�, � -s.�'�w,L �,f � , , � � r. Y :s't ,c� �-4'l''.. l.r�„"�x..��y'�t r� '�t+-C"'F+ . t-yr"�'y..�'':'�f,:^�. ��ri'`��`�- i .i- , `' �. .f+ .T.� l�l�,,_ . -;t �: '� . � .. � � - ��.� � . \�.-�js� �.5:.` �i�2c_-? "r? : .i< r� xYw'�y.��.�� ro-. . - . , � �. ,>� r v � � `',� +�.� Zti-�� -n��.c r. _ . - - -i: � �� 4 r=t� Lr:� .. _ .. ' ' : :� � ° ,t. ,-� �.:`, �v��^ � . . . _ ._ : ..�. . • � � - ' - �s�'��a. � . . . . �V1oM� .r�,a m .• . . -�cz �:�� , ._y:`• -. . .. . , — � . ' / �� l'�.. . � ,�.. \ � ` -'� l �\ �� ,. �� . � \ � •o . a,:_-;:� ��r \ � ��. --� - ._ ;`� . . '� ' � SPREAD \ ��"'-=- m, � � \STRAW � —� .,i• – � .�- � � �MU�CH _ '.; °' � � (JYP/G4L\ � p __ .'_ - ��..�� . � � � \ � � \� � ��:•�.�� : , \ \�\ �� . s^'��..,��"`�� . \ \�� . .�_ \ ��\ �� .. � � \ \\_ : � \ \ � =, - _ . . : ; . . ,.. : . _ - : �� ' 7RACK/NG' K'!TH MACH/NERY ON � - � SANDY SO/L PROYIDES ROUGHEN/NG - �� W/THOUT UNDUE COMPACT/ON. �'i`RA� ANCHORING NOTES.- 1. ROUGHEN SLOPE bYITH BULLDOZER - 2. BROADCAST SEED .4N0 F£RT/L/ZER_ 3. SPREAD STR.4W MULCIY 3" (76mmJ TH/CK. (2 1/2 TONS PER ACRE� 4_ PUNCH STR4W MULCH /NTO SLOPE BY RUNN/NG BULLDOZER UP AND 5 DOrYN SLOPE , J � f'1 Gu�� ===:�� o STRAW . � . ANC�IaRIN� � o ��: �,�, � _ - 06/17/2005 06:55 3039890204 KOECHLEIN ENGINEERS PAGE 02 Koechlein Consulting Engineers, �nc. Consulting Geofiechnicaf Engineers � 12364 W. Alameda Pkwy • Suite 115 • Lakewood, CO 80228-2845 �,vv�n�v.KCE-D anver.co�.x LAK�WOOD AVON/SILVERTH�RNE (303) 989-1223 (970) 9g9-6009 (303) 989-�204 FAX (970) 949-9223 FAK June 16,2005 Mr. Paul Fillion Vaal Associales, lnc, P.O.Box 7 Vail, CO 81 G58 Subjeet: Slope Stabiliry and Water Bac Coilstruction Goadea�Peak Ski Slope Vail Ski Area Va.if,C,olorado . ]ob No. OS-085 11.s �•equested, a�a engiiaeer f.rom oar office observed the existing Golden Peak Ski sLope and the slope between t�ae ski slope a�id Mil) Creek on Vail Mountszin on Jane 14, 2005. The purpose of our observation was to detemline tbe stabxlity of tk�e existia�g slopes after tbe coa�structio��of t�ew waiec bac's aeross the ski saope and tlZe stability o#' tlae slope betwee� the ski slope and Mill Creek. '�l�e pw-pose of tt�is letter is to preSe��t oUZ' obsexvations of tl�e slopes, our understanding of tl�e project, our conclusions with regard to the stability of tl�e slopes, and ouX recozz�.la�ez�datiox�s witb�regatd to tbe cot�sttuction of the water bars. A.s pr�viously mentioned an engineer' fron� our office observed lhe existiag slopes on June 14, 2005. Golden I'ealc Ski s{ope was obsexved fronn appro,ximately tbe bridge crossing Mill Creek up Cl�a slope approxiznately 300 yards. T.hree water bars weXe observed traversing t[iis scctioii of tlze ski slope fi�on� east to west_ Tbe wates bacs draaz�ed dow�►towaxds tlae ravi,ne between tl�e s.ki slope az�d Mi1) Creck. The wateX bars we�e approxit�ateJy 1� to 24 inches in width and appeared to have been breached Along the west edge adjacent to tl�e s)ope down towards lYlill Creek. jsolated areas of slaallow sJo�e failures or slumps were observed on the ski slope. No global s1o�e faifares w�re obsetved oz� t�e ski slope. �(�e slwmps were being xe�aired at the time of this obsex�vation. No ve$etation was observed on the ski slope bowever, it app�ated tb�at the s�Ci slope has been - seeded and mulched witb straw. The sJope between the skc� sJope at�d Mi,II Cree�C getaera�Jy slopes steeply do�vit towards lV1i�l Creek. An isolated area a�ong tltis slope is generall� level witla a very slight slope down to�vatds Mill C�eek. Large cobbles and boulde��s wece observed o�� the sur�ace of tlais slope. No indicatio�� of slope failure was obseA-ved alo�ag this slope where water fro�xi the watez-bar I�ad been flowing down d-►e slo,pe. Vegetation on the slope between the ski slope and Mill Creek consisted of Aspen trees, Pine trees, grasses,shrubs, atld weeds. Beeause t�o globa� slope failures were obset-ved on the existixxg ski slope v�d no deep (�ield iavestigatio» was petformed, a forsnat global slope stabiliry anaJysis was �lot pe�fo�xxaed for eatbe� the ex,i.stin.g ski slope or the slope behveei� the ski slo�e and �vtill Creek. ,A, fo.rtr�al g�obal s�o�� stabx�zty �a(yszs wouJd co�xsist of a dee� subsur£ace znvestigation and connputer inodeling in ordet to determine t11e factor of safety with respect to slope failure of the existing slopes. kJowever, based ozi our observations, it is our opiaion tliat a global slope stability a.nalysis �vouJd not be izecessary for the two slopes. lt is o�u� opinion that tt�e global stability of the slopes will not be greatly reduced by the constn�ction of the water bars. 06/17/2005 06:55 3039890204 KOECHLEIN EN6INEERS PAGE 03 Mr.Paui Fillion KO,EGHL,EIN CONSULTING LNCINL�L•I(S,,fNG June16,2005 C'onsultiRg Geatec/snica( Englncers !ob No.OS-0$5 Page 2 of 2 �towever, isolated aceas of sballow slope failures or sluinps a�td/or excessive et•osiozt could develop if certain pcecautions are not laken with regard to co�astz'uction of the water bars. Shallow slo�pe failuces oz' sluznps axe caused by the moistttre contet1t o�tbe soi�s iitcreasing wlaich reduces the strength of tt�e soiis. Based on ouc observatiox�s of tk�e e�istzng ski slope condations, it is our opinion that area drait�ed by tbe existing water bars was too latge to ptovide posiLive surface dcainage of the snowmelt. This resulted 1n the uqderlying soils becoming saturated, losing strength,and�'ailing. We understand that additionai waler ba�-s will be col�struc[ed across the ski slope to reduce d�e dz-ainage area of each indzvidual water bar. I"he wflter bars wi11 be slop�d dowz� towards the sa�pe between tl�e slci� area a�ad Mi11 Creek, ln order to reduce the risk of sY►allow slope failures and excessive erosion, we recomme»d that the following itenns be considered witli regard to the design and co��struetion of the proposed water bars. 1. �iacreasia-�g the nunnber of water bars, as planned, wi11 reduce the drainage area and will l�e�p reduce t�ae cisk of tl�e ski slope soils becoming satu�ated a�ad causing shallow slope failuces a�d posSible breachi�ag. 2. The vvatec bacs sho�ld be designed witb positive d�aanage in order to reduce tlte risk of water pondiitg in tlae water bars and saturating tEae underlyinb soils. 3. Where tl�e water bars e�t onto the slo,pe between the ski slope and Mill Creek,we recotnmand that a 5 foot long section down the slope be aranored wi1;,h rip rap 9n order to nlinunize the risk of�ros�o��of this transxtion azad heJp disperse tl�.e water�lowing down ttae slope. 4. Where the watez flows along the I]atter sections oP the s}ope between the ski sZope and M.ill Creek, we recommend t�at the water be controlled in a shallow channel in order to direct r]ie flow of water and reduce tl�e risk of the under►ying soils beconni��g saturated_ We appreciate tl�e oppo.rtuzaity to pcovide t�tis sarvzee. If we ca�� be of funf�er assistanee, pleas� contact our o�ce. KOEC]1LE�j�a� ��}i,�ING ENGINEER�, 1NC. ' \\ P oe...p�jJ�;�i 0 "� � %. , � .� •9:. s��, � �� • � • • - ' 33822 ' : =-v: ,�� O.r•.r°�G�dS�•' 4'`�: , � . �. '�� . Scot[�- �1Vf�'�•�j�.�.E��`�• Senior Ez�gan��l+�nu�u�u��r Reviewed by: � ` (�, �1�UU�.�i�^"' 1 Will►ana ki. Koechlein, A.E. Pl'esident 3 copies setat l copy—�ob Weave�,Hydrosphece Resource Consultants,inc. I copy—Tom Allender, S E Group . ` OBTAINEO fROM: EROSION DRAW 2.0 ^ EROSION At�O SEDIMEN7 COhlTROL MANUAL fOR' �..�z `i _ -�r �� Y ��''��"��u;�� COMPUTER—AtbED�DRAfT1NG.-SA[.tX—APPLIEO.,EART}iCARE. 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From: "Bob Weaver" <rmw@hydrosphere.com> To: <bcarlson@vailgov.com> Date: 06/16/2005 6:23:47 PM Subject: Golden Peak BMPs � Bill, Attached you will find my draft letter to Paul Fillion regarding BMPs for Golden Peak. I am sending this to you and Dave Tucholke as a work in progress because I am sure that Dave wili have some comments and refinements. However, this will hopefully provide much of the information you need for your report. Please feel free to call me if you have any questions or comments. Best regards, Bob Robert M. Weaver Hydrosphere Resource Consultants, Inc. 1002 Walnut, Suite 200 Boulder, CO 80302 rmw@hydrosphere.com Voice (303)443-7839 Fax(303)442-0616 CC: Dave Tucholke <DTucholke@vailresorts.com> ' I \ ��f � o , r+� �C�� l'�0/�/ , � S p ,,,� � � � �� ' June 16,2005 Mr.Paul Fillion Vail Resorts P.O. Box 7 Vail, CO 81657 RE: Vail Mountain/Golden Peak Stormwater Best Management Practices (BMPs) Dear Paul: In response to your request, this letter and the attached map provide instructions and guidelines for the implementation of additional stormwater drainage and erosion control BMPs for the ski slope at Golden Peak. The recommendations outlined herein are based upon field observations from site visits conducted on May 16 and 21, June 8, and 15 by Doug Laiho and I, comments received from Forest Service and Town of Vail representatives, and BMP standards and guidelines from the Vail Stormwater Management Plan and the White River National Forest Land and Resource Management Plan. Please note that the BMP descriptions in this letter are preliminary, subject to modification, and intended to serve as general instructions rather than precise design specifications. The drainage and erosion control measures described below cover the area below the half pipe down to the area around the upper terminus of Lift No. 12. The appropriate BMPs for this area consist primarily of grading the slopes to eliminate slumps and rilling, revegetation of disturbed areas, installation of additional waterbars, reconfiguration of some existing waterbars, and other measures to disburse runoff and reduce erosive energy. 1. Areas where slope erosion has occurred will be regraded and revegetated in accordance with the applicable instructions in the Vail Stormwater Management Plan (SE Group 2005). Following the application of seed and straw mulch to these areas, the straw should be anchored into the soil, as illustrated in Figure 1. 2. Re-grade and extend the existing Waterbar No. 1 across the ski slope in the area just above the relatively flat section of the slope as shown on the attached map (Figure 2). Install a short riprap rundown to the existing roadside ditch and culvert. Mr.Paul Fillion June 16,2005 Page 2 3. Realign the lower half of the existing Waterbar No. 2 so that its lower terminus is about 25 feet up-slope from the existing terminus, and extend the channel into the woods about 20 feet to an existing drainage swale. Install a small riprap basin (4 to 5 feet in diameter)to dissipate energy. 4. Install new Waterbar No. 3 extending about 3/4 of the distance across the ski slope (from the west edge of the ski slope to the east) so that flow from the existing waterbar that slopes to the east is intercepted and routed back off the ski slope to the west. Install riprap apron at the lower end of Waterbar No. 3 to dissipate energy and spread flow. 5. Install new Waterbar No. 4 extending from the east edge of the slope to the base of the existing catwallc. Place a small earthen berm at the end of the catwalk so that flow from the catwalk is directed into the new waterbar. The eroded area at the lower end of Waterbar No. 4 should be regraded, reseeded, and covered with erosion control blanket. This new waterbar will intercept runoff from the catwalk and areas above and below the catwalk that currently flow into the existing large waterbar that doubles back from the center of the slope. At the west end of Waterbar No. 4, a pipe or riprap rundown will be needed to convey water down to the rocky bench adjacent to Mill Creek and to prevent erosion of the steep slope above the stream. 6. Realign the existing large waterbar(Waterbar No. 5 on Figure 2)to the area below the rock ledge outcrop and above the snowmaking tower at the center of the ski slope. Construct a riprap apron at the lower end of the waterbar to dissipate energy and spread the flow over the slope down to Mill Creek. Note that this waterbar overflowed and was breached during runoff in mid-May, which was the primary cause of the erosion problems that occurred on the ski slope below. All of the new waterbars and drainage improvements described above will help to reduce flows into Waterbar No. 5. 7. Install new Waterbar No 6, to be located about 125 feet below and approximately parallel to Waterbar No. 5. Extend Waterbar No. 6 from the west edge of the slope to the area just above the snowmaking tower on the west edge of the terrain park, as shown on Figure 2. 8. Install new Waterbar No. 7, about 100 feet below Waterbar No. 6, and extend to the west edge of the terrain park splitting the drainage areas between Waterbar No. 6 and the existing Waterbar No. 8. Construct a riprap apron at the lower end of the waterbar to dissipate energy and spread the flow over the slope down to Mill Creek. 9. Extend the existing Waterbar No. 8 to the east into the area below the terrain park. 10. Realign the lower section of the existing Waterbar No. 9 so that it terminates about 20 feet upslope from the existing alignment. Install a culvert rundown to the roadside ditch. The existing roadside ditch and the channel below the road down to Mill Creek Hydrosphere Resource Consultants,Inc.,1002 Walnut Street,Suite 200,Boulder,CO 80302 . . � . Mr.Paul Fillion June 16,2005 Page 3 should be lined with Mirafi filter fabric and riprap to prevent any further channel erosion. 11. Extend the existing Waterbar No. 10 from the roadside ditch across the ski slope to the east, crossing under Chair 12 and extending into the area above the tunnel terrain feature. Again, it is important to note that the measures described above and on the attached figures are intended to guide the installation of additional waterbars and other drainage and erosion control improvements in the Golden Peak area. I expect that the configurations and locations of these features will be modified somewhat in response to conditions encountered during construction and in accordance with professional judgement. The design requirements for the conveyance of runoff from the ski slope down to Mill Creek will be further refined based upon recommendations to be received from Koechlein Geotechnical Engineers. We will assist ski area personnel during the installation of the measures described above by providing more specific and detailed design specifications as needed for rundowns, waterbar sizing, pipe sizes and other details. I would very much appreciate it if you would review the measures listed above and let me know if you have any questions and/or comments. Sincerely yours, Hydrosphere Resource Consultants, Inc. by: Robert M. Weaver Enclosures cc: William Carlson, Town of Vail Dave Tucholke, Vail Resorts Bill McKee, Colorado Water Quality Control Division Hydrosphere Reso�rce Consultants,lnc.,1002 Walnut Street,Suite 200,Boulder,CO 80302 • s±. . � . . . , — — '—=_-___ � Q�-� --__' +� p �� _ _ � �� _ _ �_ ��.,,. . � � . �� . , � r : . . Y v� : vtt�y J� . � = � ��I' h .. �� -- �a _ - \.�_.-� � ��t "`"� \\_,�,? a�'R,::i�. `�,t� � � �� , I �i� �. �r; � ' � �� \\ `4 \�\ � ,��.� �� x,� �� \ �'�_ . �� ;.�,� �� , � �...� �, i 1�. \ �/ �� ° � � '�ip �� , � � � ,� l� i � .� � �f �� p - ._..� / �t� �` �� S�r:t�. � � !� i� `J�� — � r'Super Pipe � � � � � — � �, -�� 21450yardsofmatena 7 / �� ;t � ��" . _ . /� /�� . � � ��.. � �� ."" ' ; � i�. �� ` \,` � : ,� � � } � � � � � � �� 'Ic .� �� "� � a,, � �I �,�, \ i, � r� j i. - � A � i �t`��i,�� 1 �� t �� • �} i � � � � � �t�a�� - �\� s��n�z �r7' �+.a ._ , - ' . . � .�'� �� ti�� '� �u\`� � � �g'��y C 1\F 3� w�}.q.`�..,, . . . � ~! t �`\ Y �, i -?:�� E�" � '�.,�:n��._c� -` � �C: . �' k.J 1�� up� h,�a �� . ; �::,��` L 1: � 1'8 . ., . `� ,. S �� ll� . , . Jib Park Featu e � � � \ � 13.000 rde of te i -'� � �\ �' ::w�� kE 1 r�. � e i Siart mp � '; _ ,000 ards otmateria �� <yy\ � rl y�� , � � Bar4A fl� � ��% �� Q F��.:: . . ventTableTOp Jumps g , , �� 30,000 yards ot materfal �:� . ' . _ � r '� . +`, . -' � ' �1�. `,lt �� `. ..,r. .., i . � �. . .� s na 2� �� s. , �„ �� a �t ,'1 �, �'---- �� ._,:: ,..: � �.-_� �� _._ , . . ,.� ,.. i : � B :x � �,;.� ,, � , � ` i ' � -�' - -_._ � e�. p �p� � � _ .. � p -_. � �. 4 Q�' �p�az,�� _�'° , p � �i � � ,; � O� � � �� :, � ' �p �s�"�� I °`�:�� . �,., � �� a � � /' �,�� ? ` , � :�,�"�'� �c�.t `-� j � �� $ �� - � "t`�� :�`�� in �� i ` ,�� v � �� n� �a��, �. , '��: � i3 � �9 c: �, :� ��q. l.-_� x � n�� `"'-�-'"�„'"�� ",` �`�� B� ��'r r� "y ;'} n ' .�� . - �.� `�� .3£ � -.� ^�yy, � . � ��rv �'!,a','` �° ,F.- a . � � l� �" � s �= �" �.__,°�-'e �'�"' ° �� y � �� `�°�:' d > ;;� �``:`; � , Figure 2 �`� �`° , u`'�,� . � � 10'ConfouNnterval � ;r..,. ��'. . ..�.. ._. � ', '�� 0 250 500 7000 PT � � � � �� Scale is Approximate � �I Bob Weaver: Phone update of Gold Peak June 14,2005 Has calc slope and water bar distribution Geo tech guy has determined upper Mill Creek BMP and slope treatments and run down into pipes if needed. Davie will be out tomorrow getting ready to reveg Bob is working on SWMP but working on now is making sure the layout is ready so we know where things go,and then Weaver will draft our plan Bob will submit a brief plan and time frame with a slope side sketch of the water bars and slope stabilization treatments. Stormwatcr Inspection Form (Coiistruction IndustrV) ' Colorado Storniwater Program (WQCD-B2-PE) Phone(303)692-3575 Fax(303) 782-0390 Email: cdpheWQStonn@cdphe.state.co.us � �� ~° S General Information Name offacility: ' '� �� ' ' CDPS#: CO ��o�� Facility Information � � ; City: County:�� Address/Directions: I i Name(s)of Onsite Representative(s): �a� phc�e:,(� S �� G��r�S--..,� �1 � �,h,�, q Permittee (If not per�nitted, Owner or Operator) � � � �� ''�'�` L`'` � '��`'�� "�\i �.1». l r:�o r,,,;,.'c� Company Name: ,�';�- Name of Responsible Official: Title of Responsible Official: phone: ( ) Address: Inspector(s): Persons present: � Inspecting Agency: !, i Date conducted: / / Pictures Taken? Yes No Records Copy of SWMP confirmed on site? Yes No SWMP Review: 1. Site description as required in the permit? Yes No Notes: 2. Site map as required in the permit? Yes No Notes: 3. BMPs for stormwater pollution prevention: a. Erosion and sediment controls as required in the permit? Yes No Notes: b. Materials handling and spill prevention? Yes No Notes: 4. Final Stabilization and long term stormwater management as required in the permit Yes No Notes: 5. Other controls as required in the permit? Yes No Notes: � 6. Inspection and maintenance as required in the permit? Yes No I Notes: �', Inspection records kept? 1 P^-�� '"'� � �"�� ""��'� F ^_Yes No 'i Inspections conducted as required in the permit? ' c� )n„� �,� �.'",-''��.c� Yes No Notes: 2`� � Q --- /I..� i _ i�.)I�-�'�"-�� >�. 3",<-(' :�L�rJ�y�� Construction start date? � � � � � �� -�� e�s'�a� �� /�Gs ,'r �-�•; N� .. ,v� ( ' , � �.� M i �� l�� . � ;1 -- I'', �( � �-+r� �n�r�� -a-5 � � - � � �, - ��r ��%� r�-; !��-�,� �3 �-� 2� ��Q s�0 ,�.�,a .. � 'j` �j.�/� �/'1� �4/-J�^i � r.~� k �r ''? r �T�`� � �ic' � _ �'/J ', / % �`,' � ��'� �, �—f � � � Stormwater Inspection Form (Construction Industry) Page 2 Site Ins ection BMPs implemented for sediment control? Yes No Notes: BMPs implemented for erosion control? Yes No Notes: BMPs implemented for rnaterials handling, spill prevention, and spill cleanup? Yes No Notes: BMPs implemented for good housekeeping? Yes No Notes: BMPs implemented for inspection and maintenance of stormwater management devices? Yes No Notes: BMPs implemented for vehicle tracking control? Yes No Notes: Evidence of offsite transport of sediment or other pollutants? Yes No Notes: Evidence of offsite transport of sediment or other pollutants reaching state waters? Yes No Notes: Evidence of discharges other than.stormwater? Yes No Notes: Comments: ��.�s��., ., �/� )a�, �a t�� . '_ �-�j Ti^ �6-�-)�^3y� 5�.�a w,� �-, '� �� / � ' � � � �� - s _ ��: �, � ,'� , - ��.D_ 5'��.�, � / 1��; Ic�� i� I�P �PeoQ_ p 5��..� �j,,� l��ca�2'�" �/��Se��p � ^ � / � / f � �� - �1� ��/� Sp±�� J��,r— , � � (��j�-S- S,S r-� �_�`�1 Q ��-�/S�� 1 G��i� s/�� ,l�s� � �� f�n .L�` � ,^�'� �, ��, ti ��-' 'ti'� �'�t�i�+,n� l�f /�i� " j�1; l -��„� ��'� � /� \ � / r,-1 �,, �., Kl rJ t�� ,,`,--.. � �:�i `� t �'�--�C,�.� � ��,f�� s��,c., f�e ,i �%, � , � .� �` U,�c� �.— `� 1 Gti-� R�.� �S ��'s� �� . � � � °�e /'c: �i4 S ; ��.�,,_r� � � � S,c� � �� .� ��sc.�t 1�� G � �'� o, ,�c f'�!-�C�'� f;�' ''� � �� f�+ �P �. d�S'�N e' `��"� rr d-� � G!�-�, /-��a %4�P �_. ,:, � v � � S P , � -�;�', � l� i�' a� �,. � �. �, �� ,�� G„�� .�( � � r'�.,c s� ';;�,� i , va�,a�so��at� Stormwater Management Inspectio�Form `�� Date: Tlme: �,� , , InspectorWa�rse: �� S7cl�l� _ aIl Breckenridge Keystone Resort: (CFrcle� Beave Creek Arrowhead Consttuction/DisEurbance Area: Construct�on/Activity Desc�iption(from SWMP}: _ - �pE_ Weather Canditlons: (Cirde) Clear Ratn ool Warm Windy Calm Last Date of Pr�ecipitation(if know ); (e-l.�,y,�� Type of InspecNon: (Circle outine Audit Emergency Has Soit Eroded From Immediate onstruction Area7 YES �O (If Y�S,describe below}, Descripbon: Strucfuraf SMP/nspecfions Reportedfo BMP Desc�iption BMP ln Descripdon of Any Needed Point of From SWMP tor Specitic Disturbance rea Place?(Y1N) Maintenance (Circte) Gonfact�(Y/N) Silt Fence/Straw Bales Re air Clean !2e lace Retnforce Remove �� Bertns 1 Sediment T�aps!Diversip� ikes Re afr Clean Replace Refnforce Ftemove ' ' Sedimentation Basins Repair Clean Replace Reinforce Remove Check Dams Re air Clean Re lace Reinforce Remove Slope Drains Re air Clean Replace Reinforce Remove Intet I Outlet Protection Re air Clean Re lace Reinforce Remove Other Repair Clean Replace Reinforce Remove Non-5tructural BMP lnspectfons Reported to BMP Description BMP in Description of Any Needed Point of From SvYMP for SpeclBc Distu�banca rea RlaceT(Y/N) Maln6enance {Cir�cfe) Contact?(YM� Reve etation-Seedin ,Sod Plant Re air Clean Profsct Reinforce Buffer�ones/Stri s Plant Re ai� Clean Protecl Reinforce Mu�h(n Plant Re air Clean Protect Reiniorce Geotextiles Plant Re air Clean Protect Reinforce Natural Ve etation Plant Re air Clean Protect Reinforce Other plant Repair Clean Proteci Reinforce SpJlJ Reportfng (Clrcle) YES NO Descrlption of Spill/(e.g.Type and quantily of material): Has Appropriate Action Been Taken? YES NO Describe: ' � �. 4/24NE Yail Arsociates �b� ��W c:147f-0T3\OSOgawlowmpFam.x(s 2� Clcd.by. JFJ S 'd Z98 '�N � �nan � i�nca� Hn WH7� :a 4nn� ��i 'AHIAI Vail Associates � Stormwater Management Tnspection Form ' �� Date: ,3 �� Time: � M Inspector Name: � , (�� Breckenridge Keystone Resorf: {CFrcle) Beave Creek Arrawhead Construction/DisEurbance Area: �� Q� 2��l�1'1 /`3. ►/PE '/lJl•�1�Jf�Df ��i�7l�-� Construct�on/Activity Description(from SWMP): y� ,S �/ ".�1 ( �,1- o Weather Conditions: (Circk) � Rafny Cool �� Vlfindy Calm Last Date of Prectpitation(iF kno �: Type of InspecHon: (Cirde .Routine Audit Emergency Has Soil Eroded From Immediate onstruction Area? YES „SNQ}- (!f Y�S,descn'be below). Descripdon: Stnrcturaf BMP Inspecflons _ ReportecE to •, BMP Descriptfon BN{P in OescripNon of Arry Needed Point of F�om SWMP for SpeciBo Disturbance a Place?(Y/N) ' Maintenance (Circle) ConEact�(Y/N) Silt Fence/Straw Bales Re air Clean Re !ace Reinforce Remove �� Berms/ Sediment Traps/Diversion ikes Re alr Clean Replace e n o Remove ' � Sedimentaaon Basins Re air Clean Re lace Remove Chedc Dams Re air Cleaa Re lace Reinforce Remove Slope Drains Re air Clean Re I Reinfa emove Inlet/Outlet Protection e air lean Re'lace ein orce Remove � Other epair Clean Replace Reinfbrqe Remove NonStructura!BMP faspecflons Reporbed to BMP DescNptton BMP in Descriptlon of Aay Needed � Point of From SWMP ior Speclttc Dfsturbanca a Place7(YM) Matn6enance (Clrc[e) Contact?(YM� Rave etatlon-Seedi� ,Sod Plant Re air Clean Protect Reinforce Buffer Zones/Stri s Plant Re air Clean Prot�ed Reinforoe • Mulchln Plant Re alr Clean Proted Relnforce � GeotexUles Pla�t Re air Clean Protect Reinforce Natural Ve etation Planl Re air Clean Proted Reinforce Other Plant Repair Clean Protect Reinforce Spl!!Reportfng (Circle) YES � , Descrtption of Spi1l/(e.g.Type and qaantity of msterial): • � Has Appropriate Action Been Taken? � NO . . Describe: • � ' � ' T�. ' 4na�t Yail A�soci�ta Dac.by:(iAW . c:197(-D731050gsw1swmpfocm,xl� �8 � Ckd.by.!ET . r. •� �oo �nu _ �nan c i�neau HA IAIHZ� :Q 40t11 '�I 'AHW � Vail A.ssociates � .� Stor�nwater Management inspection Form ` Date: ,S Time: Inspector Wame: � • J�1�� _'�2� Va Br+eckenridge Keystone Resorf: (Circle) Beave Creek Arrawhead Construction/DisEurbance Area: _ � � � �, � i Constructlon!Activity Description from SWMP): � � p�-� s' � r� C UL� WeatherConditions: (Circle) lea ' Rainy Cool � Windy Calm �ast Date of Precipitation(if kno �: Type of InspecNon: {Circle ut�n Audit Emergency Has Soil Eroded From Immediate onstru�tian Area? YES NO (Ef YES,describe below). Description: Strucfuraf 8MP/nspecffons Reported�o BMP Description BMP ln Descripdon of Any Needed Point of From SWMP for Specifie Disturbance rea Plaae?(Y/N) Maintenance (Circle) Gontact�(Y!N) Silt Fence/Straw Bales Re lace Reinforce Remove /-1 Berms/ Sediment Traps/Diversion ikes n Replace Reinforce Remove ' Sedimentation Basins Re air Clean Replace Reinforce Rernove Chedc Dams Re air Clean Re lace Rei�force Remove Slape Drains Re air Clean Re laoe Reinforce Remove Inlet!Outlet Protection Re air e Re Iace Reinforce Remove Other Repair Clean Replace Reinfbrce Remove Non-SlrocEuraf BMP fnspectlons Reported ta BMP Descriptlon BMP in Description of Amr Needed Point of From SWMP ior 5peclilc Disturbanco a Place�f1f/N) Malntenapce {Clrcfe) ConfacYt(Y/N� Rev etation-Seedin ,5od Plant Re air Clean Protect Reinforce Buffer Zones f St�i s plant Re air Clean Prof�ect Rei�foroe Mulchin Plant Re air Clean Proted Reinforce Geotextiles pla�t Re air Clean Protect Reinforce Natural Ve etation Plant Re alr Clean Protect Reinforce Q�eC Plant Repair Clean Protect Retnforce Spl!!Reporting (Circle) YES NO Description of Spi1f/(e.g.Type and qua�tiry of material): Has Appropriate Action Been Taken? YES NO . Desctibe: . "- ,�-� 4C14J96 Va1 Assoceues 2& Dca by: l3AW c:\47I.0T3\OSOgawlawimpfocm.zls Ckd.by: JEJ G �� 7.9R �nN � �nan s i�n�a� dn w�l.F �9 �0�7. �b l '�dW I i � � IVail Associates Stormwater Managetnent Inspectivn Form '� i pa�= D� Time:�� Inspector Name: � ��d/� ^ � Breckenrtdge Keystone ResorE: (Circle) Beave Creek Arrawhead Construction/Disiurbance Area: ��i 4�- L, ��. Coastruction I AcNvity Description(from SWMP): �— � ��,r �� C f � SE� o A S Weather Conditions: (Circle) ear Ralny Cool � Wi�dy Calm Last Date of Precipltation(if know ): Type of Inspection: {Circle o ' e� Audit Emergency Has So'sl Eroded From Immediate onstruction Area7 YES �� (tf YES,describe below). DescripGon: Sfructuraf 8MP lnspecffons Reported fo BMP Desc�Eption BMP in Description of Any Needed Point of From SWMP for Spec�t Disturbaace rea Place?(YIN) Maintenante (Circle) GonEactT(Y/N) Silt Fence/Straw Bales e ' Clean Re lace Relnforce Remove �1 Benns/ Sediment Tra s/Diversion ikes 'r` Replace Refnforce Remove ' ' SedimentaGon 8asins Repair.Clean Re lace Reinforce Remove Check Dams Re air Clean Re lace Reinforce Remove Slope Orains Re air Clea Replace Reinforce Remove Inlet/Outlet Protection Re air Re lace Reinforce Remove Other Repair Clean Replace Rei�fo�e Remove Non-5trucfura/BMP frrspectlons Reporbed to BMP DescNptian BMP in Descriptlon of Am►Needed Point of From SVYMP Tor Speclftc Disturbanca rea Place?(Y1N) Main6enance (Circfe) Contact?(Y/N) Reve etation-Seedi� Sod Plant R air Clean Protsct Reinforce Buffer�ones/Stri s Plant Re sir Clean Proted Reinforce Mulch(n Plant Re air Clean Proted Reinforce Geotextiles Plant Re air Clean Protect Reinforce Natural Ve etation Plant Re air Clean Protect Reinforce Other Plant Repair Clean Protect Reinforoe Splll Reporting (Circle) YES NO bescrlpCbn of Spill/(e.g. Type and quantiry of materiat): Has Appropriate Action Been Taken? YES NO Describe: ' - • r'� � an4r�e Vail Asisociazes 2� Ik�.by. GAW c:\47I-073\OSOgawlawmpfo[m.x(s Clcd.by:!EJ S 'd Z9$ 'ON . � '�34 Sl�OS3� d� WdZ� �4 SOOZ '6l 'AdW i IVail Associates Stormwater Management Inspection Form `� Date: J a� C7� Time: , � Inspector Wame: � •�� V I Breckenridge Keystone Resott: (CErcle) Beave Creek ArrQwhead Construction/Disfurbance Area: �� a- L,� Construction/Activity Description(from SWMP�: �vE c� U a - �.D o N W G� • : � C��- - vGu WeaEherCanditions: (Circle) Cleat Ratny Cool � Wrndy Calm Last Uate of Prectpitation(if know ): Type of Inspection: (Cirde �� Audit Emetgency Has Soil Eroded From Immediate onstruction Area? YES N (ff YES,describe below). Description: Structurat 8MP lnspecHons Reported to BMP Description BMP tn Description of Any Needed Point af From SWMP for Specific Disturbance rea Place?(Y/N) Maintenante (Circte) GonEact�(Y/N) Silt Fence/St�aw Bales e a' ea Re lace Reinforce Rernove �--t Benns/ Sediment Tra s/Diversion ikes lea Replace Reinforce Remove ' � Sedimentation 8asins epair Clean Re lace Reinforce Remove Check Dams Re air Clean Re tace Reinforce Remove Slope Drains Re air Clean Replace Reinforce 12emove Inlet/Outtet Protection Re air Re lace Reinforce Remove Other Repair Clean Replace Reinforce Remove Non-5tructurnl BMP(ns ectlons Reporbed to BMP Description BMP ln Descriptlon of Any Needed Point of From SWMP Eor SpeclTEc btsturbanca rea Place?(Y/N) Maln6enapce (Circfe) Contact?(YlN) Reve etation-Seedin ,Sod Plant Re sir Clean Protect Reinforce Buffer zones/Stri s Plant Re air Clean Protect Reinforce MWch(n Plant Re air Clean Proted Reinforce Geotextiles Plant Re ai� Clean Protect Reinforce Natural Ve etation Plant Re air Clean Protect Reinforce Other Plant Repair Clean Protect Reinforce SpJI/Reportfng (Gi�cte) YES NO Descrlption of Spi1t/(e.g.Type and quantity of material): Has Appropriate Action Been Taken? YES NO Describe_ � -� �,,..� 4�24NQ Va�'I Aasociazes 2� Dea.by. GAW c:\971-0731050gaw1swmpfocm.zla C1cd.by: JEJ S 'd Z98 'ON � 'A3a S1�OS3� dA Wb'l� �9 SOOZ 'b l 'AdW I Vail Associates Stormwater Management Inspection Form �`� Date: �Cn� Time: �p I'lf� Inspector Narrie: � � U�� ^ --/----� Breckenridge Keystone Resort: {CPrcle) Beave Creek Anewhead 0 Consttuction!Disturbance Area: � � � �/ Construct�on!Activity Description(from SWMP�: V�, �� o oy{� � � _ _ ry�, �-s '6 P�-�-- :� afl i �.s �ativ �i�A�Tk2 ' c,ee�s.�' � Weather CondiNons: Circle I � ) � Rafny Cool �� Windy Calm- Last Date of Prectpitation(if know �: Type of InspecNon: (Circle Routine Audit m� lias Sofl Eroded Frorn Immediate anstruction Area? YES NO (lf YES,describe below). Descripdon: StructurdlBMPlnspecfions � Reportedfo BMP Descrfptton BMP In DescripBon of Any Needed Point of From SWAAP for Specifi�Disturbaoce rea Place?(Y/N) Maintenance (Circ(e) Gontact��1flN) Silt Fence I Straw Bales e a ' Re{nforce Remove r� Ber►ns/ Sediment Traps/Diversion ikes � Reinforce Remove ' Secfimenta6on Basins Repair Clean Replace Reinforoe Remove Check Dams Re air Clean Re lace Reinforce Remove Slope Drains Re air Clean Re lace Reinforce f2emove Inlet!Outlet Protection e ' Re'Iace Reinforce Remove Other epair Clean Replace Reinforoe Rernove NorwStructura/BMP fnspecflons Repor6ed o BMP Description BMP in Description of Any Needed Point of From SWMP for SpecliEc btsturbanca a Rlace�(Y/N) Mafntena�ce (Citc[e) Contact?(YM) Reve etation-Seedin ,Sod Plant Re air Clean Profect Reinforce Buffer�ones/Stri s Plant Re sir Clean Protect Reinforce Mu�chin Plant Re air Clean Aroted Reinferce Geotextiles Plant Re air Clean Protect Reinforce Natural Ve etation Plant Re air Clean Protect Reinforce �� Plant Repair Clean Protecl Retnforce 5pf1!Reporfing (Circte) � NO Descrlption of Spill/(e.g,Type and quantity of material): Has Approprlate Action Been TakenT � �� Describe: • . -�- �� lL4/'9Q Vail Associazes a147I-0731050gaw�ewmpfocm.zls '�8 Da.by: QAW Clcd.by:JEJ S 'd Z98 'ON . � 'A34 S1�OS3� dA Wb'Z� �9 SOOZ 'b l 'AdW i va�i a�so��at� Stormwater Management Inspection Form '�� Date: � Tlme: � � Inspector Name: �, . � � (,.� ail ' Bneckenridge Keystone Resort: (Circle) Beave Creek Arrowhead (� d Construction!Disturbance Area: � � 1 �C,�'� �g i Construction!Activity Description(from WMP�: �� y � � � U�� 1 �.k=5 G�," - � � �sZ- 1ti1 l�l,, C` / U �N�., � '� b�1 p Iv 1-� ' ,Q sO�h�PE-� WeatherCanditions: (Circle) Clear Rainy Cool ,arm Windy Calm Last Datc of Precipitation(if kno ): Type of Inspection: {Cirde Routine Audit mergen Has Soil Eroded From Immediafe onstruction Area� �� NO (If YES,describe below). Descripdon: Structura/SMP l»specfions Reported to BMP Description BqAP in Description of Any Needed Point of From SWMP for spec;fic Disturbaoce rea Place?(Y/N) Maintenance (Ctrcle) Gontact?(Y/N) Silt Fence/Straw Bales a�• e ta¢e Refnforce Remove ,--�� Bertns/ Sediment Tra /Diversion ikes air e e a - Refnfo�ce Remove ' � Sedimentatian Basins epaa ean RepTace Reinforoe Remove Check Dams Re air Clean Re lace F2einforce Remove Slope Drains Re air Clean Re lace Reinforce Ftemove Inlet/Outlet Protection e . ea e lace Reinforce Rernove �ther Repai� Clean Replace Reinforc,e Rernove Non-Strocfura/BMP!ns orrs Reporbed to BMP Descript�on BMP in Descriptlon of Any Needed Point of From SWMP ior Speclflc btstu�banco roa PlaceT(Y/N) Malntenance (Clrcte) Contact?(Y/N) Reve etation-Seedin ,Sod Plant R air Clean Protect Reinforce Buffer Zonea/Stri s Plant Re air Clean Protect Reinforce Mulchin Plant Re air Clean Proted Reinforce Geotextiles Plant R air Clean Protect Reinforce Naturat Ve etation Plant Re air Clean Protecl Reinforce Other Plant Repair Clean Protect Reinforoe Sp111 Reportfng (Circle) YES NO Descrlption of Spill/(e.g.Type and quantiry of material): Has Appropriate Action Been Taken? � �p Describe: " ,�^� �2ar9e vail Aswciues 28 Des.by: GRW c:\97I-073\OSOgaw�awmpfam.xb Clcd.by: JEJ 5 'd z98 �oN � �A3fl S1�OS3� dA WdZ� �9 SoOZ �6� �hdw � � Vail Associates Stormwater Managexnent Inspection Form ,'� �m � . Date: ,� g Ttme: S""� Inspector Name: b� Breckenridge Keystone Resort: (Circle) Beave Creek Arrawhead � Construct�on/DisEurbance Area: �o (�}� �-/� �Q� Construction/Activity Description(from SWMP}: Weather CondiNons: (Cirde) ar% RaEny Cool ,� \ Windy Calm Last Date of Prectpitation(if know ): - Type of Inspectlon: (Circ.le La' e� Audit Emetgency Ftas Soil Eroded Fro Immediate onstruction Area? ti ,��,5�' NO (If YES,describe below). Description: 1/t� �n�E o� LcJ Stnrctural BMP/nspecffons Reported to BMP Description BMP in Desc�ip[ion of Any Needed Point of From SWMP for Specifio Disturbance a Place?(Y/N) Maintenante (C1rcle) Gontact7(YfN) Silt Fence/SMaw Bales e a' 'Clean Re lace ein Remove l-t Benns/ Sediment Tra s/Diversion ikes a Clean Repiace e nforce Remove ' ' Secfimentation Basins epair e Replace Fteinforce Remove Check Dams Re air � ean Re lace Reinforce Remove Slope Drains Re air Clean Re lace Reinforce Remove Infet I Oudet Protection e""'� Clean Re lace Reinforce Remove Othet Repair Clean Replace ReinforGe Remove Non-5trt�ctnral BMP fnspecUons Reporbed to BMP Descriptton BMP in Descriptton of Arry Needed Pofat of From SWMP[or Speclflc bistu�banco rea PlaceT(Y!N) Matnbenance (Clrcfe) Contact?(Y/Nf Rev etation-Seedin ,Sod Plant Re air Clean Protect Reinforce Buffer Zones/Stri s Plant Re air Clean Protect Reinforce Mulchin Plant Re air Clean Proted Reinforce Geotextiles Plant Re air Clean Protect Reinforce Natural Ve etation Plant Re aic Clean Proted Reinforce Other Plant Repair Clean Protect Reinforce Spll!Reporting (Gircte) '�YEB� NO Descrlptio f Spi1[/(e.g. T pe and quantity of material): �j�;`r"� 0 r/E2 ��}�L `�5 ��l�. C�/� t t A171 . ..� ,p Has Appropriate Action Been Taken7 � �p Describe: . �.XTR�- S� �.Nc'� R$� C2�� u G �1TGI-{-��' ... - � �na�e vai)Associazes Des.by. G.4W c:\97I-073\QSOgawlrwmpforn�.xle 2g Clcd.byr !EJ 5 'd Z98 'ON . � �naa s i HnsaH dn wdt� �g �oot �h� ��dw IVail Associates � .� Stormwater Management Inspection Form � ' Date: .5 �8 Ttme: �� Inspector Narne: !�" �/ �(�_ �- - Breckenrtdge Keystone Resort: (Circle) Beave Creek Arrawhead Construction!Disfurbance Area: � �� ? Sa . Construct�on!Activity Description(from SWMP): Weather CondiHans: (Cirde) � Ratny Cool � Wrndy Calm Last Datc of Prectpitation(if know �: ' Type of Inspection: {Cirde ne Audit Emergency Has Soil Eroded From Immediate onstructiort Area? YES � (tf YES,describe below). Description: Structuraf BMP inspecSons Reported fo BMP Desc�fption BMP in Descrlption of Any Needed Point of F�om SWMP tor Specific Disturbaace rea Place?(Y/N) Maintenance (Circle) Confact�(Y/N) Sift Fence/Straw Bales a�r a Re lace Reinforce Remova �� Benns/ Sediment Traps/Diversio� ikes e ' Replace Reinforce Remove ' SecEimenta6o�8asins Re air ` Re lace Reinforce Remove Check Dams Re air Re lace Reinforce Rernove Slppe Drains Re air Clean Re lace Reinforce Remove Inlet!Outlet Protection Re air Re'la ein or Remove Other Repair Clean Replace Reinforce Rernove Non-Struchrra/BMP lnspecdoas Reported to BMP Description BMP In Description of Any Needed Point of From SWMP ior SpecNFc Disturbanco a Place�(YIN) MainMnanca (Ctrcfe) Contact?(YM� Reve etation-Seedin ,Sod Plant Re air Clean Protect Reinforce Buffer�ones/St�i s Plant Re air Clean Protect Reinforce Mulchfn Plant Re air Clean Aroiect Reinforce Geotextiles Plant Re air Clean Protect Reinforce Natural Ve etation Plant Re air Clean Protect Reinforce Other Plant Repair Clean Protect Reinforce SpJI!Reportfng (Circte) YES NO Descrlption of Spilt/(e.g.Type and quantity vf material): �V N �d'►T 0 rsom ��'tj �;U� Has Approp�iata Action Been Taken? YE NO . Describe: � _ Pth� S� �r� � � -- ,-� 4l24N6 Vacl Associazm 2� Du.by. GAW c:\97 1-07310 50gaw1cwmpfotmxls �d� Jp,� S 'd �98 'ON � 'A3Q Sl�OS3� dA Wt1Z� �9 SOOl '6l 'hbW I MEMORANDUM � TO: Tom Allender FROM: Bob Weaver, Hydrosphere SUBJECT: Golden Peak BMPs DATE: May 20, 2005 CC: Paul Fillion Thanks for sending along your memo to Bill Carlson. Following are some suggestions and modifications regarding the water bars and rundowns in the area above the Golden Peak Pumphouse. 3. New water bar. One additional water bar may be added in the area between the upper water bars, depending on construction conditions. (The ground in the areas where the snow was removed yesterday is still frozen and the surrounding slope are too soft and wet for construction equipment access.) This would help reduce the amount of water intercepted and carried by the lower water bar and in combination with# 6 below, distribute overland flow more diffusely to Mill Creek. If it is not possible to install this new water bar, contingency measures will include the additional work as described below under# 6 and # 7. (LTNDER CONSIDERATION) 4. Add rundowns. 12"to 24"HDPE will be installed at the end of the lower water bar to transport water down the steep bank to the new sediment basin described below in # 5. (IN PROGRESS) 5. New sediment basin. A large shallow sediment basin with silt fence baffles and 24" HDPE outfall to Mill Creek will be installed in the flat area adjacent to the bridge. This basin will intercept flow from the existing lower water bar and small diameter plastic pipe interceptors described in# 6 below. (FRIDAY) 6. De-water the water bars. Addtional4"to 6"HDPE flexible plastic pipe will be used to intercept part of the flow from the water bars and diffusely disperse it via several outfalls to Mill Creek, vegetated areas above the creek, and to the sediment basin described in# 5. This will decrease the flow rate and concentrations of water in the water bars and help prevent failures in addition to spreading out the water. (IN PROGRESS) 7. Same as # 6 in your memo. Please call if there are any questions. Hydrosphere Resource Consultants � - . - MEMORANDUM PO BOX 2729 301 WEST MAIN STREET SUITE 201 FRISCO CO 80443 TE�: 970.668.3398 FAx: 970.bb8.5798 W W W . S E G R P . C O M TQ; Bill Carlson, TOV Environmental Health Officer FROM: Tom Allender, Senior Mountain Planner CC: Paul Fillion, Robert Weaver, Dave Ozawa DATE: May 20,2005 RE: Additional BMPs on Golden Peak _ The following list is per your request for a summary of the additional BMPs we are implementing as part of our efforts to better control the sediment that is coming off of Golden Peak. 1. Add a new culvert to Mill Creek Road directly below the half pipe snow field. This culvert will divert half to three quarters of the nznoff from upper Golden Peak down the road ditch to an existing culvert where the water travels down a swale with large flat areas which holds the water, allowing the sediment to settle. From the flat areas the water will travel down Follow Me Road in a new ditch. (COMPLETED) 2. New Sedimentation Pond on Follow Me Road. The new Follow Me Road Ditch leads to a new sedimentation pond which as field designed will hold the water before it is release to the Mill Creek Road Ditch. From the Mill Creek Road ditch the water will travel to a culvert which will take the water through a grassy swale to the Camp Area. The Camp Area is a large natural depression that will be enhanced to hold the water until it is released to Mill Creek. Over flow from the pond will continue down Follow Me Road to the Mill Creek Road and on to the Camp Area. (COMPLETED) 3. New Water Bar. An additional water bar will be added between the upper water bars. This will allow for the flows to be lessened and dispersed. (IN PROGRESS) 4. Add Run Downs. Flexible 8"plastic pipe will be installed at the end of the water bars to transport the water down the steep banks to Mill Creek. The pipes will be aimed at large energy dissipaters (rocks) at they reach the Creek. The pipes will minimize erosion on the steep banks. (IN PROGRESS) 5. De-water the water bars. Additional flexible plastic pipe will be used to intercept part of the flow from the water bars and disperse it to Mill Creek. This will decrease the volume of water in the water bars and help prevent failures in addition to spreading out the water. (IN PROGRESS). 6. Additional applications of waddles or straw logs and straw bails in appropriate areas to further slow the water. I will add this memo to the Vail Beaver Creek Storm Water Management Plan as an amendment. A graphic of the Run Downs will be included. Don't hesitate to call if you have any questions or concerns. .--� o °'± °' � � a �L SD � M (4 �+ 3�U V O Q � � i. � � � � N �9 � . � � � In Cn') N T � ' M d� �O 4?l o N \ Q� � 1 o N �O bU � r� � � O � ''•,�: ' I � 1 / !, tti � �� N ei_'___��_"" _._I'__ _ _" ;'" ___' . _ _ .. 1.. _ ._' e N � � � � � T— �� I .,o . �. " _ ' '_'_�� ____ . e N N �� I S.1 I L J 3 O � � _ � _ � ~o � v� - ---- -i- _ . _��--� --- ---- � T � �N . M �F-�e I E -.-I o � H u' " �. ` I � I 5 �Ql Z ; T_ . �� a-' i--' � . .� � 0�J � ' �— �I - -- - .. _-__ ~° � � _ _ _._ _ I� . , 5 , eo V n � I � �� I'�, � � � O ,� I � ; } 3 �° I � �—�_ I �f c�n , , �., _ .. i -----�.. - - -�- - �e �0 + +-'.°.1 _ _ I e� O �W � � � I O � _ � T I �„� ca a' � � , ��. ' i '�,i Q _,..�e �— , �. l� �" I �. _ I � N .�� > p . ___I_ �� _ __ __!_ __ _ _�_ .___ __ �e d J I eN z � � U i ¢ n I � it ¢. t� r�� M � �p ' �"�-r o i ! — J! � ; cC a �J � �— � : S� '"a .. . - - ------ ---- i -- - �°e � ~N I V � ��y Q�.1 � ir i� �—. '' ' ,� V� �-+ � ' � � � � �i .+� j'�, i II '... � .., � ,. ��_ ��. �e .3� � � . . .. -------"- ---- ----. .. � ! ''� i.�i � � T—� c� a. � �„� ��'� �, � a� � , � � C% 'n�" U Fr ` -- 3 .� � _ I ..o 0 0 a, . -- _ �o �r . _/�!� � � � M M CN1 N .�i .� N e.�i N� T ir � � � v � O 4 1' � � � °3 � {'uT} �MS J 'dz�a�d ;o>o .� � , Q„ i � �L L� i= �� I � a a �+ A� y �� L,�1 iY � � �� 75 South Frontage Rd. Department of Community Development Vail, Colorado 81657 William T. Carlson,REHS 970-479-2138/479-2139 Environmental Health Officer FAX 970-479-2452 Apri128, 2005 Dave Tucholke, Supervisor Grooming and Snow Making PO Box 7 Vail, CO 81657 ItE: Facility Inspection Vail Ski Area Town of Vail Dear Mr. Tucholke: An inspection of the above-referenced facility was conducted by the Town of Vail on Apri127, 2005. The inspection procedure consists of two parts: a review of records,and an on-site facility inspection. Findings associated with the inspection are detailed in the enclosed inspection report. You must correct the findings noted in the enclosed inspection report,submit an explanation on how each finding was corrected, and submit the requested materials to tbe Town of Vail, 75 S. Frontage Road,Vail, CO 81657 and to the Colorado Department of Public Health and Environment,WQCD-P-B2,4300 Cherry Creek Drive South,Denver,CO 80246-1530,Attn: Matt Czahor by May 16,2005. � For facilities covered under a Colorado Discharge Permit System (CDPS) general permit, failure to comply with any CDPS permit requirement constitutes a violation of the Federal Clean Water Act and the Colorado Water Quality Control Act,25-8-101. If you have any questions,please call me at(970)-479-2333. Sincerel , � � �� ;r/ k William T. Carlson,REHS Environmental Health Officer , En�losures cc: Matt Czahor,Water Quality Control Division File Copy — � , _ _ �______ � — �r � C3 O � ' - ��; � �. � � � $�� •;� ,_ - 4 'yn,� , ,\� _ . .. . . .. . .. / � _.�55p-- . . �- �, .: - ;,,� �� . �Z� . .n, _ ._ .. � � � � _ � 950p, . '__'___ _ \ --��._"-- �\ �... . _ . ` ��_ � . M -- , I ��\ � . ... lL� '-_.'_�. ' . . _ _ . �_._'__ __ �. --'_�� _'=!^ .. . , , � � �_. .� ' � 1 \ - . � � �_'' �� .. - V� '�� . I � . - . . � ��V � .� .��, � i . . . ' � r. _ _ . i �' � � � � ,ir � .p ' � ' Su er Pi e �� ..� : 21 p450 yards of materia � � � , .` \ \ i �� i �,:., �" � � / � � � � � �� '\� \ / �� y�� ' � ; �� ' = `�='� � ' . � Jib Park Features � ' � �-1��_13,000 yards of materia � , r i `, i /; � l ; _ \ �► � ; � � �� `V� � - � Event Start amp - -� 2,000 ards of material� � .5 _ � ;� r � � ' . . � '. � ' � . _ .� ,11�/ /� . . . �1 � 1 � ..� \ ^ ,�,�0� _� . �'-'� ��, �, � Event Table Top Jumps �p ; - 30,000 yards of materia 650� 8 I `� � ' � � /�i / � �� U i p / /� `\ - 86� '/ . ,'/�;. �� .\ . .�// � ; � �, . .'i/' i ,.'' � : � � r . I ' � ' i \ �.... ._ .,.�... ...--._..'_ ....'_' . _.._. -_�_ .. ..- ... __�.. ._. � : .. . �� ' . . . , / / , / O .B'0�• �� '�� L-------- " US FOREST SERVIC� , �.-- / , �__ � PR!b'ATE � - -; —T g, �3- - � - ----� - - - C� __� � i �� ,;,, - . ,. N�� . -` ._ __. __ ��?'_ � �,� . . �rypp . i== .. I �F��. ,' � �►'�► c� � �- _ -- , - . -- : - 0,�, o � Q a��a6° � � - _ �� ,. �' � _ _,� �a_�----- - -� , , � _�„_ � o� �� _ , - �<. o _ ; o�, • , , _ f : � �'� �S � � Q1� '�r�1 , � p, �-' ��,� I � �'� '` �p r' � '.�4.'� I � � ., � � � �C � � '�F ��1 �, �w• � y, . r � o,[,,, `� � °M'�° �� 8 'h as� - - � �� ,_ y �. � , ,� �- , � ` � � t?' �7 ` ' ; - � � �� ;,� C� } '. � , ^��\'��„�, ■� �, �O-+ +�! � ~ �� _ ��, � —_____� � � .. O .ri� ,,��__!,._ �_� 0LO" Q. iG �y��" . � X �x� �/� � �', � � ` � �k�.�'k� . ' �! f Q � X`� , � r x � - f� - � J�� qr � _ �j,� .�+ � .. \,� �� i�� Q ^ #,J �_�C) �� ''�d; f^ �. [ N jT } J ,,[ � k .... . C, `�� L! .-� �1 S.GU�; , �/ �� r " �.� <� � - 1�� v� �. `��..� � -_.._--_ ��...-__� ; `y.�.,. � � - � � -......--.- "�' � . �_-- • ��Z/� - �O�-� ��, � �il��O� -��:?[f2� � ' � tOt;� p �� -- =--a,_� 10'Contour Interval � B2„ , �yzoo__ _ � � ti: - 0 250 500 1000 FT --- _ —� � �-� Scale is Approximate ' ~'� � ` -'� Stormwater Inspection Form (Construction Industry) � Colorado Stormwater Prograni(WQCD-B2-PE) Phone(303)692-3575 Fax(303) 782-0390 Email: cdpheWQStonn@cdphe.state.co.us General Information Name of facility: ' '� CDPS#: CO !�� C..� �'� S `��," ° ��c ��-��,�� E V , Facilit Informatio City: ` County: '+��1i°�'�"/'2 Address/Directions: � Name(s)of Onsite Representative(s): JQ. � phone: ( ) � �/�� a l��^� lr,�.; C'�,, �rc.�"� LGs�,,� ��'r�s�� Permittee If not ermitted Owner or O e tor �^ Company Name: U ' e /1 / Name of Responsible Official: 3�d -`�c'G Title of Responsible Official: phone: ( ) Address: * l / / Inspector(s): �% � Sd �^' Persons present: �J cj Inspecting Agency: � "� �' ' / C'e�/ � ��"'2Ga Date conducted:�/�/'Q�� Pictures Taken? Yes No Records Copy of SWMP confirmed on site? Yes No SWMP Review: 1. Site description as required in the permit? Yes Idb Notes: 2. Site map as required in the permit? Yes No Notes: 3. BMPs for stormwater pollution prevention: a. Erosion and sediment controls as required in the permit? Yes No Notes: b. Materials handling and spill prevention? Yes No Notes: 4. Final Stabilization and long terin stormwater management as required in the permit Yes No Notes: 5. Other controls as required in the permit? Yes No Notes: 6. Inspection and maintenance as required in the permit? Yes No Notes: Inspection records kept? Yes No Inspections conducted as required in the permit? Yes No Notes: Construction start date? � ,---- ' �m,�,� '...�c►�� k;� �`=� — �`'=� !�-r-�C°� �,"°.��'°'� n K�,,, � P �.�, ; „�".. �.�=�°!� ! � � S , ��-� �a. �C� 3 � � �r�( � Stormwater Tnspection Form (Construction Industry) Page 2 �°°' ��6 � .. Site Ins ection BMPs implemented for sediment control? Yes No Notes: BMPs implemented for erosion control? Yes No Notes: BMPs implemented for materials handling,.spill prevention,and spill cleanup? Yes No Notes: BMPs implemented for good housekeeping? Yes No Notes: BMPs implemented for inspection and maintenance of stormwater management devices? Yes No Notes: BMPs implemented for vehicle tracking control? Yes No Notes: Evidence of offsite transport of sediment or other pollutants? Yes No Notes: Evidence of offsite transport of sediment or other pollutants reaching state waters? Yes No Notes: Evidence of discharges other than stormwater? Yes No Notes: / /- �,�1 e, �!/ J/ �-` r� !'°� ,/ . . Com�ents: I..n4C' 1 t� / /-� .-%`"�+1C� �'�s �-"- C( .,� �P �,�st�y �`•�� P'��a+.. �� (I.s/r� ��c� R b�=-�� Q�to ?,� I�GG,.r �•r(l2� � ' '-,�/"�� -a � �"��.��l, � ° , ,�. ` ,/� �,j a � - �� • .0 \ � '..i� ,'y �..YS a p..A�, "G.✓ .�.-, ��'...r� `.�.."�-- . ''�pr�_.d �..,�� :.'� + � � .i!r--��. .f.y . , _� ' �. 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'U � � � b0 � � � � � � � '� P� .� !% '� � y O U 'd b cC O � U C7 � � a o. . � .� � � � y °�' z o a ;� � w 0 � a��i � `� � � ti ,� � a� �' � � b � b �a�i � o o ° � w� v� U C7 �n b a� b b � � o o .a 0 � � � � .o � o 0 ,. •°-° � � � � �' c > > � a a � * R . , .��.��.�-. :;�,w.,�,��.�.�-r�� ; Vail Associates, Inc. -Vail Mountain Storm Water Management Plan VAIL ASSOCIATES, INC. � 2004 COLORADO DEPARTMENT OF HEALTH STORM WATER MANAGEMENT PLAN FOR VAIL MOUNTAIN (CERTIFICATE NO. COR-030541) PROJECT NAME& LOCATION Vail Associates,Inc. Vail Mountain Ski Area Eagle County, Colorado The Vail Mountain Ski Area is located due south of the Town of Vail, Colorado in Eagle County. The Vail Mountain Ski Area covers approximately two-thirds of Township 5 South,Range 80 west of the 6th P.M., approximately the eastern one-quarter of Section 12, Township 5 South, Range 81 West and approximately the northern 1/3 of sections 3, 4, & 5 of Township 6 South Range 80 West. This Storm Water Management Plan(SWMP) covers construction and maintenance projects on the ski mountain that may involve vegetation removal and grading,which require erosion and sediment control measures and other projects which have the potential to release unwanted chemicals or material to surface water. This SWMP is updated annually to reflect current year proposed projects, and at other times to reflect evolving changes or improvements in Best Management Practices (BMPs). This SWMP covers projects in the Summer Construction Plan dated Apri130, 2004 and subsequent amendments. 1 Vail Associates, lnc. -Vail Mountain Storm Water Management P(an OWNER NAME &ADDRESS Vail Associates,Inc. P.O.Box 7 Vail, Colorado 81658 Local Contact: Brian McCartney,Vice President,Vail Mountain Operations 970/479-4601 2 �s� ,��, �.�� « �xrc t n. Vail Associates, Inc. -Vail Mountain Storm Water Management Ptan SECTION 1 CONSTRUCTION ACTIVITY DESCRIPTION � A. GENERAL Vail Associates, Inc. operates the Vail Mountain ski resort on public (U.S. Forest Service) and private land under Permit #4056/O1. The permit area for Vail Mountain is approximately 12,226 acres. Construction and maintenance activities on Vail Mountain occur annually, generally during the summer months. The total area impacted by construction and maintenance activities varies from year to year, as does the area expected to undergo clearing, excavation and/or grading. In 2004,the total maximum projected disturbed acreage is 44.3 acres or approximately 0.36 percent of the permit area. Vail Associates prepares an annual "Summer Construction Plan" and a "Summer Operating Plan" to guide and define current year activities. These Plans are formally submitted for review and approval to the local U.S. Forest Service (IJSFS) office (White River National Forest, Holy Cross Ranger District). The local USFS office is responsible for oversight of consfruction and maintenance activities on USFS land, and ensures that all construction and maintenance project proposals on Federal land meet all Federal regulatory requirements, including the White River National Forest Land Management Plan. Conshuction plans(drawings and specifications including erosion control measures) for construction activities on private land are reviewed and approved by Eagle County or the Town of Vail as applicable. A list and description of activities that could potentially occur in 2004, drainage basin characteristics and applicable site maps, can be found in Appendix A. Vail Associates has long been recognized in the ski industry as a leader in the field of sound construction site management, for both the control of"significant materials" such as fuel and for erosion and sediment control. For example, the revegetation program formulated and practiced by Vail Associates has been adopted by other resorts and is commonly referenced. In short, through a close working relationship with the USFS, which oversees all ski mountain construction projects, Vail Mountain has a long and successful track record of construction site management. Vail Associates' historic practices more than satisfy the objectives of the Colorado Water Quality Control Division in this regard. � 3 . ... ,� .� �.�,�,�� ,.�,��..�.a�,�.. �.b..,w„��...��.��_,��,<„,.�, Vail Associates, Inc. - Vail Mountain Storm Water Management Ptan B. CONSTRUCTION PROJECT CATEGORIES Although the number, size, and location of construction and maintenance activities changes from year to year, the general type of projects remains relatively constant. A brief description of the types of projects, and associated activities for which Best Management Practices for Storm Water Pollution Prevention are applicable,is as follows: 1. Slope and Trail Projects. Constniction activities include tree cutting, clearing, grading, and excavation tasks associated with new or modified ski runs, catwalks, and lift corridors; walking and mountain bike trails; hard surfaced nature trails for the physically disabled; and access trails/travel corridors for snowcats and other slope grooming equipment. Major clearing and excavation activities are generally accomplished using large, heavy earthmoving equipment such as bulldozers and large backhoes and loaders; skidders and feller-bunchers may also be used. Minor projects are accomplished using smaller construction equipment such as "bobcats," small gasoline-powered equipment and hand tools. A minor amount of rock crushing and blasting also occurs. 2. Under�round Utilitv Projects. Construction activities include excavated trenches and installation and burial of water, sewer, natural gas, electric, communications, and snowmaking lines, and associated backfill and compaction. Ancillary construction efforts include excavation for and installation of buried concrete utility vaults and manholes, skier tunnels, and surface mounted hydrants and valve stations for pipe utilities. Typically, these activities are accomplished with small-to medium-sized backhoes with the assistance of flatbed trucks and truck-mounted hoists. 3. Lift and Lift Support Proj ects. Construction activities include new lift towers and foundations, new lift terminal buildings and foundations, new lift maintenance buildings and foundations, and smaller, unheated support buildings such as tool sheds and terminal area grading. Typical equipment includes cranes, backhoes, bulldozers, dump trucks, concrete trucks, and front- end loaders supported by portable generators, welding machines, cutting torches and small � gasoline-powered equipment. Due to access restrictions and to minimize environmental damage, lift support towers are commonly placed using heavy lift helicopters. Also included in this category are lift maintenance projects. These projects involve repair or replacement of towers, cables, chairs, lift houses, lift structures, and mechanical equipment such as 4 . ._ ; ,.��.-�.�;.- ,�,��..�.��..�.� � �:�� _ � �. � -� Vail Associates, Inc. -Vail Mountain Storm Water Management Plan diesel engines, torque converters and gearboxes. Construction activities for lift maintenance projects generally do not require new excavations or significant earthwork. 4. Buildin�jects. The range of projects in this category include new,full-service restaurant facilities, remodeling and/or expansion of existing on-mountain facilities, outhouse replacements, new gazebos and viewing decks, and new "Adventure Zones". Construction activities for the . smaller projects are generally limited to post-hole drilling for caissons and standard wood frame construction techniques using hand tools and portable power tools. Generally,utilities are provided to many of these facilities. Building remodel projects generally do not require new earthmoving, but do generate a significant amount of demolition debris. New buildings and major building additions generally require significant excavation and grading using heavy earthmoving equipment supported by hoists or cranes, dump trucks, concrete mixers, portable generators, welding and cutting equipment, and other small equipment such as paint sprayers during construction or maintenance processes. � 5. Roadwork Projects. New or widened roads generally require tree cutting, clearing, significant earthmoving, and quite often require a limited amount of blasting to remove unstable rock faces to achieve desired grades.and alignment. Typical equipment includes large bulldozers, front-end loaders, dump trucks and road graders. No roads within the Vail Mountain permit area are paved. Road cross-sections are generally designed to balance cuts and fills, thereby reducing the amount of material to be wasted at the site or trucked away for disposal. Revegetation water bars, drainage ditches, culverts, and sediment traps are installed as permanent erosion and sediment controls according to USFS specifications. Excavation or filling operations within the riparian zone of intermittent or small perennial streams may be required for culvert placement during road construction. Larger stream or creek crossings generally require small constructed bridges, which necessitates significant excavation of the stream bank for construction of bridge abutments. 6. Fuel Storage and Chemical Stora�e Projects. Vail Associates has undertaken a process to reduce and consolidate the number of sites used for fuel storage and chemical storage. Closure or renovation of existing sites and construction of new sites will be accomplished over a number of years. Closure of existing fuel sites will require removal of underground storage tanks and, at selected sites, may require soils that contain petroleum products to be remediated in accordance with relevant federal and state regulations. Special precautions for storm water control and 5 . ��-�.��.�.,��„�:,:. :.�,��.. �- ,�„ , ,.. Vail Associates, Inc. -Vail Mountain Storm Water Management Plan management will be required during tank removaUremediation activities. Removal of existing chemical storage sites will require similar precautions, although no underground tanks will be involved. Construction activities for new fuel sites will involve deep excavations which will generate a large volurne of soil, and will probably require excavation bracing and control of groundwater. Ancillary ' tasks include construction of piping and pumping for fuel loading and unloading equipment, and miscellaneous concrete work. Per Federal regulations (40 CFR 112), fuel storage sites with a combined underground storage capacity greater than 42,000 gallons require the preparation of a separate Spill Prevention Control and Countermeasures (SPCC)plan. Site-specific SPCC plans are outside the scope of this SWMP but such plans have been prepared by Vail Associates. In 2004, tliree new separate 30,000 gallon diesel fuel tanks are planned to be installed on Vail Mountain. Construction of new chemical storage sites, or upgrades to existing chemical storage sites, will incorporate special design features for secondary containment of spills and for weatherproofing to minimize the exposure of chemicals or containers to adverse weather. Excavation and grading for concrete slabs and small foundations are expected; however, no special construction techniques impacting storm water are expected. 7. Removal Projects. Facilities and structures which are no longer needed and cannot be converted to other uses will generally be demolished and the sites restored to natural conditions. Demolition activities will generate large volumes of debris, including small volumes of potentially hazardous scrap such as lead-based paint chips, lead joint pipe, or asbestos. Minor excavation will be required to disconnect or remove underground utilities; however, underground pipelines will generally be plugged with concrete and abandoned in place. Small, concrete foundations of slab- type construction may be excavated and removed in their entirety. Larger or deeper foundations will generally be abandoned in place, or broken up and pushed into the subgrade (basement) level of the structures prior to backfilling and grading of the site. On rare occasions, a surface water detention facility (pond) may be removed from service. Demolition activities associated with a pond removal include dewatering, breaching of small earthen embankments, sediments or sludge stabilization, backfilling and final grading. Bottom 6 Vail Associates, Inc. - Vail Mountain Storm Water Management Plan sediments and water will be tested, if required, for potential contaminants prior to disposal or backfilling. 8. Environmental Improvement Projects. Construction activities associated with environmental improvements may include any of the following tasks: prescribed burning for vegetation controUwildlife habitat enhancement,earthmoving within riparian zones to create new or enlarged wetlands, radical tree thinning for small mammals, tree thinning to improve stand health or diversity, sediment removal from existing sedimentation ponds, furrowing or benching to improve revegetation efforts on steep slopes, miscellaneous cross-slope ditches and water bars for erosion/runoff control and wildlife waterers. Bottom sediments will be tested, if required, for potential contaminants prior to disposal or back-filling. 9. Maintenance Activities and Spring Runoff Control. Although not construction-related activities subject to associated Storm Water Discharge Permit requirements, these activities are described here because of the vital role they play in controlling erosion from storm water runoff and snowmelt. Activities include spring snowplowing for all roads, culvert maintenance and replacement, ditch maintenance, road blading and resurfacing, opening and repairing cross-slope water bars, cleaning sediment ponds, and spot revegetation/mulching. Most of these activities are listed as "USFS Required Projects" in the annual Summer Construction Plans. Vail Associates dedicates approximately 15 people plus various pieces of equipment to these tasks throughout the summer months. Approximately 36 projects are proposed for the 2004 construction season at Vail. From the standpoint of sitewide control of erosion and potential sediment loading to streams, the key points to recognize are: 7 „,r, . � e,_�.,�-,��. .�,�;.��.�.�,�...��-� .� v Vail Associates, Inc. -Vail Mountain Storm Water Management Plan 1. Construction activities are generally on widely-separated parcels; 2. Most disturbed parcels are less than 1 acre in size; 3. Vegetated buffer zones are maintained between individual parcels; 4. Site-specific construction plans receive review and approval by outside agencies; 5. Temporary erosion control measures are installed prior to revegetation,if needed; 6. Permanent revegetation of disturbed sites commences as soon as possible; 7. Spot revegetation,mulching, and fertilization is performed annually as needed. C. CONSTRUCTION ACTIVITIES NOT COVERED BY THIS PLAN Construction activities conducted on private property outside the Permit Area and not associated with ski resort activities controlled by Vail Associates are excluded from this Plan. In particular, real estate development projects or private land for which individual storm water management plans must be prepared are not covered by this Plan. Construction activities on public land within the "Permit Area” that are initiated and managed solely by federal or state agencies (USFS, Colorado Department of Health, etc.)are likewise excluded. D. CONSTRUCTION SEQUENCE FOR MAJOR ACTIVITIES Earth moving activities anticipated for Vail Mountain during 2004 will collectively disturb more than 1 acre (see Table A-2), hence the need for this SWMP. For each construction project, erosion and sedimenf controls will be implemented in accordance.with site-specific construction plans and � � with management practices contained within this document Site-specific erosion and sediment control measures receive extensive review as part of the construction plan approval process generally performed by USFS. For projects on USFS land, the pre-construction planning process begins with layout and staking of the proposed project by Vail 8 ��,�� .�� =p� �. �� . � �� - Vail Associates, Inc. - Vail Mountain Storm Water Management Plan Associates personnel, followed by a site visit with USFS personnel to review the site selection and probable erosion control measures to be used. Changes or recommendations are incorporated into the project plan, and special studies of geology and wetlands are performed if required. Finally, construction documents (designs and specifications) are submitted for review and approval prior to starting construction. T'his Plan recognizes the importance of the construction plan review and approval process in integrating storm water control measures with the sequencing of construction activities. For the purposes of this Plan, construction sequencing begins with approval of the construction plan, and is followed by installation of storm water controls as the first construction related activity. These controls remain in place until all other construction, soil stabilization, and revegetation tasks are completed and final project acceptance has been granted by the appropriate reviewing agency. Pertaining specifically to the construction process, the following general sequence of activities is followed: 1. Clearing and grubbing necessary for temporary and/or permanent erosion control measures. 2. Installation/construction of temporary and/or permanent erosion control measures. 3. Remaining site clearing and grubbing. 4. Disposal and/or chipping,burning of cleared and grubbed material. 5. Salvage and stockpile of topsoil. 6. Road grading(if applicable). 7. Storm drain installation(if applicable). 9 _ , , �. ...��:� � .4�...�..��..� ,� . .. . . , ,._, _ . Vaii Associates, inc. - Vai! Mountain Storm Water Management Plan 8. Construction activities, including management of construction debris, spoil piles, and soil stockpiles. Installation of specific BMPs to provide erosion protection prior to revegetation. 9. Temporary seeding and/or soil stabilization(if necessary). 10. Final site grading, including construction of permanent cross-slope water bars and drainage swales, and placement of stockpiled topsoil. 11. Final (i.e., permanent) seeding,planting, mulching and fertilization. Seed mixtures approved by USFS. 12. Removal of temporary control measures. E. OFF-SITE SOURCES OF RUNOFF The Vail Mountain area is a headwaters area; therefore, no off-site drainage from developed areas impacts water quality or quantity at the site. Snowmelt and storm water runoff from high peaks to the east and south of the Permit Area contributes additional flows to upper reaches of Mill Creek and Lime Creek,respectively. F. ON-SITE STORM WATER RUNOFF According to the 1985 Vail Ski Area Expansion Environmental Assessment, site soils are formed on colluvium residuum, alluvium, and glacial till derived from the Minturn Formation. With minor exceptions, the soils of the site are uniformly sandy red soils with a sand content of 40 to 70 percent. Clay content in the subsoils is uniformly 10 to 15 percent. The soils on north-facing slopes are typical Colorado sub-alpine forest soils; Cryochrepts and Cryoboralts. Soils of the south- facing bowls are a complex of Cryochrepts and some Cryoborolls. The erosion hazard immediately following disturbance ranges from low to severe, and is categorized as low for existing areas and after revegetation. The well-drained, deep sandy loam soils are described as having favorable engineering and agronomic characteristics, suitable for all " 10 -�.��..:. �,�.�r,.�. � :�_� ��. �x� , ,:_ . .. �, , _ Vail Associates, Inc. -Vail Mountain Storm Water Management Ptan uses related to ski area development. Soils are classified as Soil Conservation Service Type B hydrologic soils. As can be seen in Table A-2, construction efforts will not change long-term runoff coefficients. There are 22 drainage basins potentially affected by construction and maintenance activities at Vail Mountain. General basin characteristics are described in Appendix A,Table A-2 and delineated on Figure A-l. Since individual sub-basins are unnamad tributaries of the major creeks in the area, drainage basin names were selected based on common designations given to identified skiing areas (e.g., China Bowl, Game Creek Bowl) or other descriptive features. All primary receiving streams eventually drain to the Eagle River. � 11 �.�.�:��. ,.,�,�,� - �� ., . �., . Vail Associates, Inc. -Vail Mountain Storm Water Management Plan SECTION 2 , MATERIALS MANAGEMENT AND SPILL PREVENTION A. GENERAL Vail Associates maintains a Hazardous Waste Operations Plan to guide and control the use and storage of hazardous chemicals, and a Spill Prevention Control and Countermeasures (SPCC) Plan which controls the storage and use of oil and other petroleum products and defines response actions to spills or other releases. These Plans are applicable to construction activities as well as all other activities at Vail Mountain. Vail Associates has a designated Safety Officer within its Risk Management Department who has overall responsibility for Materials Management and Spill Prevention. In addition, numerous operations and maintenance personnel receive Occupational Safety&Health Administration- (OSHA-)approved Hazardous Materials Management training. B. MATERIALS Table 1 lists the "significant" (as defined by the relevant NPDES regulations)pollutants (except for sediments or eroded soil material) that may be present during construction activities, the potential � sources of these pollutants, and the location of potential spills. 12 _ �,-�.�� .�. �-� ,.� . _ : .�. . _ Vail Associates, Inc. -Vail Mountain Storm Water Management Plan TABLE 1 POLLUTANTS THAT MAY BE ASSOCIATED WITH CONSTRUCTION ACTIVITIES ON VAIL MOUNTAIN Potential Pollutant Sources Location Gasoline(benzene,toluene, Construcrion vehicles,gas cans, Job site,access roads,fuel sites ethylbenzene,xylene,tetraethyl generators leads,and other cornpounds) Diesel fuel(and associated Heavy construction equipment Job site,access roads,fuel sites constituents) Oil,grease,hydraulic fluids Construcfion vehicles,heavy Job site,access roads,fuel sites, construction equipment, storage areas,lift houses generators,small containers,lift equipment Solvents(TCE,TCA,and others) Small containers Job site,storage areas Paints,stains,varnishes Small containers,bulk containers, Job site,storage areas ' spray equipment Glues,waterproofing compounds Small containers,bulk containers Job site,storage areas Fertilizers Bulk containers Storage areas Herbicides/pesticides Small containers,bulk containers Job site,storage areas Chlorine(hypochlorite) Disinfection of water lines Job site,storage areas Cement Bulk containers Job site,storage areas Metals,paint chips,wood chips, Construction debris Job site,access roads � insularion,asbestos,plastics Microbiological contaminants Sanitary wastewater Sepric tank/leachfield systems, (coliform,giardia,etc.) broken sewer lines � Glycol Construction vehicles and Job site,access roads,compressor equipment,snowmaking sites . compressors,small containers, bulk containers Magnesium Chloride Dust suppression operarions on Access roads,storage areas roads,bulk containers 13 Vail Associates, Inc. -Vail Mountain Storm Water Management Plan Potential Pollutant Sources Location Copper Sulfate Containers,algae control Ponds,storage areas operarions in ponds Soil Cement Bulk containers Job site,storage areas Tackifiers Bulk containers,spray equipment Job site,storage areas Fire Retardant Bulk containers,spray equipment Access roads,storage areas, firefighting or slash/burn locarions Explosives-Dynamite,pentalite, Containers Explosive cache sites,job site ANFO,blasting caps,primer cord C. MATERIALS MANAGEIVIENT PRACTICES Vail Associates will conduct its on-mountain construction and maintenance activities in accordance with the following materials management practices: 1. Materials will be handled in accordance with the Hazardous Waste Operations Plan, Occupational Standards &Health Association(OSHA)requirements,manufacturers instructions, and site-specific SPCC plans. Chemicals regulated under CERCLA will be reported and handled in accordance with relevant regulations and will have Materials Safety Data Sheets (MSDS) on location. Pesticides will be handled in accordance with the label, the Colorado Pesticide Application Act, and will be approved by the USFS prior to application. As needed, pesticides will be applied by a licensed applicator. 2. Materials stored overnight at the job site will be covered or otherwise protected from the elements. 14 N -��:» , ��.� � �.��-�.� ,. �� _, Vail Associates, inc. - Vail Mountain Storm Water Management Plan 3. The amount of fuel and lubricants stored at the job site will be reasonable to support daily operations. Petroleum products will be stored in bermed areas, drip pans, or other containment. If drip pans are used,they shall be cleaned periodically. 4. Bulk storage areas for material not used on a daily basis will be enclosed and protected from the elements and will have suitable containment to prevent spills or leaks to the environment. 5. Pesticides and fertilizers will be stored at separate facilities or protected by impermeable barriers. 6. Hypochlorite and/or other chlorine compounds will be stored separately from other materials and kept dry. 7. Potentially hazardous job site construction debris will be stored in covered containers(when necessary)and removed from the job site on a regular basis. D. SPILL CONTROL PRACTICES � In addition to the material management practices discussed above, the following practices will be followed for spill prevention and cleanup: l. Manufacturers' recommended methods for spill cleanup will be clearly posted and site personnel will be made aware of the procedures and the location of the information and cleanup supplies. 2. Materials and equipment necessary for spill cleanup will be readily accessible. Equipment and materials will include, but not be limited to, brooms, dust pans, mops, rags, gloves, goggles, "kiriy litter," sand, sawdust, and plastic and metal trash containers specifically for this purpose. 3. Spills will be cleaned up promptly after discovery. Materials used for spill cleanup shall be disposed of at approved�off-site facilities. 15 Vail Aisociates, Inc. - Vail Mountain Storm Water Management Plan 4. The spill area will be kept well ventilated and personnel will wear appropriate protective clothing to prevent injury from contact with a hazardous substance. 5. The Vail Associates designated Safety Officer will be notified within 24 hours of spills of potentially toxic or hazardous materials. Spills of toxic or hazardous material will be reported by the Safety Officer or his designee to the appropriate federal, state or local government agencies in accordance with applicable hazardous waste regulations. All spills will be reported to the USFS immediately. 6. This Plan will be revised to include measures to limit the likelihood of spill reoccurrence and how to clean up the spill if there is another one. A description of the spill,what caused it, and the cleanup measures undertaken will also be appended to Part E of this Plan. 7. The construction site superintendent directing day-to-day site operations will be responsible for on-site spill prevention and cleanup coordination. Site superintendents and deparhnent supervisors receive Hazardous Materials training. The names of responsible spill personnel will be posted in the material storage areas and in all on-site construction offices. As stated earlier, Vail Associates has prepared other documents that enumerate spill containrnent control procedures, and these will be consulted as necessary. E. HISTORY OF SPILLS AND SPECIFIC LEAKS OF TOXIC OR HAZARDOUS SUBSTANCES No spills or leaks of toxic or hazardous substances have been reported to have occurred on the site. The only previous fuel spill of note involved the diesel fuel spill at the Chair 10 fuel site on November 7, 1986. Approximately 2400 gallons of fuel was released to the ground when a fuel pump was turned on, causing fuel to be pumped out on the ground. Vandalism was suspected by the Vail Associates staff. The affected area was estimated to be 125 feet by 15 feet. Water samples 16 ��. �,�� ;� �, � ,��.� .,. �, � Vail Associates, Inc. - Vait Mountain Storm Water Management Plan taken from the nearby creek showed no contamination. Staff from the USFS, U.S. Environmental Protection Agency (EPA), and state and local agencies were notified the same day. Work crews responded immediately by temporarily stabilizing the contaminated soil (during a snowstorm). Two days later,work crews removed approximately 50 cubic yards of material and transported it to a special site at the Eagle County Landfill. The excavation was immediately filled with sawdust to absorb any remaining fuel. This sawdust was left in place over the winter and removed the next spring. Clean backfill was placed in the excavation. No further action was required. Due to unsaturated goundwater conditions and immediate response by Vail Associates personnel, no groundwater or surface water contamination resulted from this incident. Vail Associates was commended by both EPA and USFS personnel for their swift, aggressive, and creative response to the fuel spill resulting in minimal impact to the environment. In August of 2000, during the excavation of the Golden Peak compressor building, diesel contaminated soil was discovered. It was thought that in the early 70's when portable air compressors were used in the area, some quantity of diesel was spilled. Vail immediately enrolled the help of an environmental resource firm to evaluate the site. A total of 220 cu/yards of impacted . soil was removed from the site and disposed of at the Eagle County Landfill. Environmental Resources Management confirmed through sampling, that any petroleum effected soil with concentrations of TEPH greater than the OIS Tier 1 Threshold Value of SOOmg/kg had been removed from the spill area. 17 Vail Associates, Inc. - Vail Mountain Storm Water Management Plan SECTION 3 MANAGEMENT PRACTICES FOR EROSION AND SEDIMENT CONTROL A. GENERAL Soil erosion and sediment control practices are used to reduce the amount of soil that is transported into receiving waters, including wetlands; from lands disturbed by construction and maintenance activities. Controls can be either temporary (during the construction phase) or permanent (after construction) and include both structural practices (such as filter fence) and non-structural practices (such as limiting the amount of acreage that can be disturbed at any given time). All controls have the following general objectives: l. Minimize the total amount of disturbed soil, over the life of the project and at any � given time. 2. Minimize or prevent storm water runoff from off-site areas from flowing across disturbed areas. 3. Slow down the runoff flowing across the dishirbed areas;often by flattening and/or roughening slopes. 4. Capture and remove sediment from on-site runoff before it leaves the site. 5. Provide vegetative buffer zones between construction sites and receiving streams. 6. Provide temporary seeding or other stabilization measures for exposed soils during job delays, or if permanent revegetation cannot be accomplished before winter. 7. Permanently revegetate and stabilize exposed soils as rapidly as feasible. 8. Install permanent structural controls(i.e.,water bars, sediment traps)as appropriate. 18 Vail Associates, Inc. -Vail Mountain Storm Water Management Pian 9. Protect existing streams and natural drainage pathways from concentrated flows which will cause erosion. � 10. Install "multiple layers of control" to the extent practicable, so that if one control system fails,one or more backup controls will be available. Specific structural and non-structural control practices potentially applicable to construction and maintenance activities at Vail Mountain are described in the following sections. Utilization of these measures is site-specific. The objectives listed above, as they are applied to Vail Mountain, do not relate to specific performance standards such as "no more than 5 tons of sediment per acre per year" or to a specific design storm such as the "5-year, 6-hour storm." Instead, they are offered in the context of a BMP- based program for erosion and sediment control that is consistent with the national, state and'local state-of-the-practice. B. STRUCTURAL PRACTICES Table 2lists and describes potential structural erosion and sediment control practices. Diagrams of these structural practices are included in Appendix B. Table 2 is meant to provide representative measures and it is not a complete list. Site-specific conditions may dictate alternative BMPs. 19 Vail Associates, Inc. -Vail Mountain Storm Water Management Plan TABLE 2 � POTENTIAL EROSION AND SEDIMENT CONTROL PRACTICES FOR VAIL MOUNTAIN (Note: Applicability determined on site-specific basis) Control Practice Description&Purpose Locations Used Drainage Swale Shallow,excavated,lined or unlined Upslope of construcrion site to divert temporary channels used to intercept clean runoff away from site,or and divert overland flow. L'uung downstream of site to divert sediment- material may be plasric sheet,half laden runoff to sediment trap. culverts.or other material. Interceptor Dike Ridge of compacted soil used to Ground full or part of perimeter of site. . intercept and divert overland flow. Downslope of site. Around existing Generally used in conjunction with shuctures or stockpiles. drainage swales. Temporary Stream Bridge or culvert across a stream or - Intermittent streams and natural storm Crossing water course for short-teml use by water drainage paths. construction vehicles. Used to protect sireambanks and channels from damage and erosion. Temporary Storm Temporary pipe to redirect an existing Dishubed areas drained to an existing Drain Diversion storm drain or outfall channel to a new storm drain or channel. location. Pipe Slope Drain Temporary flexible or rigid pipe used to Unstabilized slopes where it is difficult carry concentrated runoff from the top to divert upslope runoff around the to the bottom of a slope that has not disturbed area. been stabilized. Generally used in conjuncrion with swales,interceptor dikes and sediment traps. Surface Drains Buried perforated pipe(s)used to Excessively wet sloping soils. High intercept groundwater and dewater water table areas. Unsuitable for saturated soils subject to slippage or shallow soils or under traveled areas. where saturated soils may prevent the growth of certain types of vegetadon. Used as both temporary and permanent control measure. Silt Fence Posts with filter fabric stretched across Bottom of a slope along a line of the posts,with the lower edge of the uniform elevarion. Mid-slope locations � filter fabric trenched and buried below subject to sheet and rill erosion. ground surface. Temporary measure Unsuitable for use in streams or large used for small or wide disturbed slo es 20 Vail Associates, Inc. - Vail Mountain Storm Water Management Plan Control Practice Description&Purpose Locations Used to control overland sediment transport swales. or to reduce the speed of runoff flow. Also used to catch windblown sand and soil. Gravel or Stone Filter Temporary ridge of loose gravel,stone Gentle slopes where roads and other Berm or crushed rock used to slow and filter rights of way under cons�ucrion should runof�'flows within exposed traffic accommodate vehicle traffic or at traffic areas. areas within the construcrion site. Straw Bale Barriers Temporary hay or straw bales staked in Downslope and sideslope of disturbed place and partially bedded in native soil. areas. Within drainage swales or small Used to slow and filter direct runoff drainageways. and/or as small check dams to aid settling out sediments from concentrated flows. Sediment Trap Temporary earthen embanlanent across Used in conjuncrion with and at the low area or drainage Swale,with or lower end of other control measures without a small excavated basin such as dikes,swales,slope drains, upstream,with an uncontrolled outlet or construction entrances,and vehicle spillway constructed of large stones or wash areas. aggregate. Used to slow the release of runoff allowing most of the silt to settle out. Sediment Basin Settling pond with a controlled storm Generally used for disturbed area water release struchue. Used to collect greater than 5 acres in size in and store runoff from construcrion conjuncrion with other control acriviries for sufficient time to settle out measures. Topography dependent. Not the majority of sediment. Used as both for use in active streams. temporary and permanent control measure. Outlet Protecrion Stone,riprap,concrete,or paved aprons Directly below pipe,interceptor dike, below storm drain outlets used to reduce swale,or channel secrion outlets and the speed of concentrated storm water above the receiving channel. . flows;thereby reducing erosion and scour. Used as both temporary and permanent control measure. Check Dams Small temporary dams of rock, Steeply sloped swales or small open sandbags,or logs,similar to sediment channels. Other locations where it is �aps but of more permanent not possible to divert the flow or construction. Used to lower the speed otherwise stabilize the channel. of concentrated flows to reduce downstream erosion and allow sediments to settle out. Used as both 21 Vail Associates, Inc. -Vail Mountain Storm Water Management Plan Control Practice Description&Purpose Locations Used temporary and permanent control measure. Surface Roughening Grooves,depressions,or steps that run All disturbed slopes,immediately after parallel to the contours of the land. grading activiries have ceased. Specific Used to reduce the speed of overland method(grooves,steps,etc.)depends runoff,increase infilh�arion,and trap on slope,mowing requirements,and sediment. Used as both temporary and available equipment. permanent control measure. Gradient Terraces Permanent earth embankments or ridges Long,steep slopes subject to erosion and Cross-slope Water and channels constructed along the face problems. Not suitable for rocky or Bars of a slope at regular intervals. Used to sandy soils. reduce erosion damage and to direct runoff to a stable outlet. Helicopter Yarding No water bars will be installed where Designated trail construction,steep cut timber has been removed using a slopes,and sensitive ground soils and helicopter and where the native vegetarion. vegetarion is substantialiy undisturbed. Clear Water Bypass Temporary pipeline used to convey Stream Crossings water through disturbed site during , construcrion. Brush Piles Tight piles of brush to disperse and Out flows from water bars,road ditches slow down flows of water. and culverts,could be used at toe of fill banks. French Drains Permanent underground piping to dry Wet Areas out saturated soils. C. NON-STRUCTURAL PRACTICES Non-shuctural erosion and sediment control practices consist of interim and permanent soil stabilization efforts, and planning efforts to minimize disturbances to existing vegetation. Table 3 lists and describes potentially applicable non-structural practices. In general, all disturbed areas are reseeded, mulched and fertilized within two weeks of substantial completion of a project. Other - non-structural practices are used as needed on a site-specific basis. 22 Vail Associates, Inc. -Vail Mountain Storm Water Management P(an As mentioned previously, Vail Associates is a leader in the ski industry with its approach to revegetation. The cold climate and high elevation combine to limit the available growing season, requiring specialized seed selection and intense revegetation management. Vail Associates has developed a seed mixture of fast-growing grass and forb species acclimated to the difficult climate at Vail Mountain. All reseeded areas are heavily mulched to moderate extreme temperatures at the soil surface, and routinely fertilized to promote rapid growth. In addition, previously revegetated areas are inspected annually, and seeded, mulched, and fertilized as needed if bare or thin areas appear. TABLE 3 POTENTIAL NON-STRUCTURAI,EROSION AND SEDIMENT CONTROL PRACTICES FOR VAIL MOUNTAIN (Note: Applicability determined on site-specific basis.) Control Practice Description and Purpose Locations Used Temporary Seeding Seeding of disturbed areas with a uniform Disturbed areas awaiting fi�rther fast growing grass mixture such as rye construcrion or permanent grass to min;mi�e erosion during revegetation. Spoil piles if construction delays. removal or reuse will be delayed. Topsoil stock piles. Permanent Seeding and Revegetation seeding and/or planting and All disturbed areas. Planting fertilization of disturbed areas with a designed mixhue of narive plant species to provide long-term,pern�anent soil stabilization after all construction acriv.ities have been completed. Mulching Placement of grass,hay,woodchips,bark, Disturbed areas exceeding 4:1 straw or gravel over bare or reseeded soil slope. Disturbed areas exposed to surfaces to reduce the speed of storm windy moisture,or hot and dry water runoff,hold seed,fertilizers,and conditions. Mulch on slopes topsoil in place,and protect newly seeded exceeding 2:1 may require a areas from extreme temperatures. binder,netting,or tackifier to hold it in place. Geotexriles Porous woven fabrics of syntheric Any disturbed area where ( lastic, lass)or biode adable 'ute, ermanent stabilizarion via 23 Vait Associates, Inc. - Vail Mountain Storm Water Management Plan Control Practice Description and Purpose Locations Used wood fiber,cotton)material. Used as revegetation is desired. Channels matting to stabilize flows in channels and and swales where revegetarion is swales,and to protect seedlings on difficult or not expected to be planted slopes. Used as netting material successful. to hold mulch in place on seeded areas. Chemical Stabilizarion Soil binders of vinyl,rubber or asphalt Alternarive to temporary seeding sprayed on the soil surface to hold the soil where temporary seeding is in place. ineffecrive due to season or climate. Sod Stabilizarion Placement of sod to provide immediate Any disturbed area that might stabilization or to provide areas where erode and where long lived plant storm water can infiltrate to the ground. cover is needed immediately. Examples include buffer zones, . stream banks,dikes,swales, oudets,and filter sh-ips. Buffer Zones Vegetative strips either newly planted or Any site that can support left undisturbed during construction. vegetation. Particularly suitable Used to decrease the overland velocity of next to wetlands,along stream storm water runoff: banks and on steep,unstable slopes. Preservarion of Natural Existing trees,brush,vines,and grasses Any site. Particularly beneficial Vegetarion that provide natural,permanent buffer for floodplains,wetlands,sh�eam . zones and long-term stabilization. banks,steep slopes,and any area where erosion controls would be difficult to establish,install or maintain. Stream Bank Stabilization Placement of permanent riprap,gabions, Streambanks subject to heavy concrete,log cribbing or asphalt to erosion from increased flows or prevent stream bank erosion from high disturbance during constzuction,or storm water runoff volumes and flow where vegetarive stabilization is rates. not pracrical. 24 Vail Associates, Inc. -Vail Mountain Storm Water Management Plan SECTION 4 INSPECTION AND MAINTENANCE A. SPILL PREVENTION MEASURES The spill prevention coordinators designated in this plan, Mr. Paul Fillion and Mr. Luke Carlin and their representatives will conduct regular inspections of construction sites and storage areas for. compliance with spill control, waste management, and clean up procedures described in this plan. Deficiencies will be noted on inspection logs, and repairs and/or maintenance activities to correct the situation will be initiated in a timely manner. Follow-up inspections should document the date and activities undertaken as corrective actions. This has long been the protocol for Vail Associates. B. EROSION AND SEDIMENT CONTROL MEASURES Temporary erosion and sediment control measures associated with conshuction and maintenance activities will be inspected by the on-site construction superintendent or his representatives after each storm event of greater than 1/2- inch precipitation, and at least weekly during the construction process. Permanent erosion and sediment control measures will be inspected in the spring, and at least monthly during the summer construction season. Repairs and/or maintenance activities necessary to maintain or restore temporary or permanent control measures to good and effective operation will be initiated in a timely manner. Storm water sampling, if required by the Colorado Department of Health or USFS regulations, will be obtained by a qualified environmental engineering consultant, or by Vail Associates personnel suitably trained for this activity. 25 Vail Associates, Inc. - Vail Mountain Storm Water Management Plan . SECTION 5 RECORDKEEPING AND INTERNAL REPORTING PROCEDURE Incidents such as spills or other releases to storm water, .information on storm water quality or quantity,relevant construction documents, and relevant operations plans will be included in records maintained for the Vail Mountain site. Inspection records (discussed in Section 4, above) and maintenance and repair records will also be maintained at the site. 26 Vail Associates, inc. - Vail Mountain Storm Water Management Plan SECTION 6 CONSISTENCY WITH OTHER PLANS As mentioned in previous sections, Vail Associates operates its Vail Mountain Resort in accordance with various plans and permits which include: 1. USFS Permit#4056/O1. 2. White River National Forest Land Management Plan. 3. Vail Mountain Master Plan,including Category III. 4. Annual Winter Operating Plans. 5. Annual Summer Operating Plans. 6. Annual Summer Construction Plans. 7. Hazardous Waste Operations Plan: 8. Spill Prevention Control and Countermeasures(SPCC)Plan 9. Mountain Bike Master Plan. 10. Snowmaking Master Plan. 11. US Army C.O.E.Nationwide General and Individual Permits, if applicable. 12. CDPS Permit#COR-030000 13. Lynx Conservation Agreement . 2� Vait Associates, Inc. - Vail Mountain Storm Water Management Plan This SWMP is designed to be consistent with the above Plans and Permits, and no other relevant discharge permits (e.g., NPDES) apply to the site. If other permits affecting storm water are required of the site in the future,this SWMP will be modified accordingly to ensure consistency. 28