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Land Use Case.315 Park Ave.A39-96
315 9 ·Fea & Ave (4-, A 2-16 ---Winnerman 315/317 North Park Ave - i 2737-181-58-002 5< call·Ucl LE ~ 4 7- \~i ~ ~ 1,1 3 1, 4 0 9 1 1 1 ' i CASE~AD SUMMARY SHEET - CITY Ol~PEN DATE RECEIVED: 5/24/96 CASE # A39-96 DATE COMPLETE: STAFF: Suzanne Wolf] PARCEL ID # 2737-181-58-002 PROJECT NAME: Winnerman Stream Margin Project Address: 315/317 North Park Avenue, Aspen APPLICANT: Larry Winnerman Address/Phone: 317 North Park Avenue REPRESENTATIVE: Jay Hammond, P.E., of Scchmueser Gordon Meyer, Inc. Address/Phone: PO Box 2155, Aspen 81612 ----- 925-6727 FEES: PLANNING $450 # APPS RECEIVED 12 ENGINEER $0 # PLATS RECEIVED 4 HOUSING $0 ENV HEALTH $0 TYPE OF APPLICATION: TOTAL $450 Staff Approval »IT. RECEIVED $450 P&Z 10 1 12 C]Yes [ZINO ! CC C]Yes C]No CC (2nd reading) C]Yes C]No REFERRALS: U City Attorney E Aspen Fire Marshal U CDOT E City Engineer El City Water £ ACSD U Zoning U City Electric m Holy Cross Electric U Housing U Clean Air Board U Rocky Mtn Natural Gas U Environmental Health E Open Space Board U Aspen School District ® Parks U Other: Il Other: DATE REFERRIED: 4'~3 ~ INITIALS: DATE DUE: 6 ~ 3> APPROVAL: Ordinance/Resolution # Date: Staff Approval Date: Plat Recorded: Book , Page CLOSED/FILED DATE: INITIALS: ROUTE TO: .. CONTACT SHEET City of Aspen Department: Tele.~...Location _- \)01"vt€ewIA·4 371%167414 MHM)ate _..O/~2#97 Time 4..ty /911 Subject: . ,&*< _ __/6 *73P595'7M Contacting Party: 44 Notes: __:7 /7E_./25*62 : 1))5,76_1)0#Fae,40,L+_2.43JE#U) ___1~yl- ___11/u- 2,;_-dFF_--_-2'004_ ,_ *#6 - _s,6 es__OF ___ Bm-PA'/A31-5, ~ - D(57310**U OE- 3,_ AM_ A 80#A PT_ _ 6#EAK.s , 6 (140 L ~ 60/~ la-41 - , COAST*U ¤70,1 2~ ~04 4 1*0705*443 , . ,:5074- _S/ztW,«21*n__/URF-74_ Z/*dZ£-- 3~ -#*-141_jf,€//4£_, .~ -Z- /J>t' ___aF~.__- AMM Ce/Ad/'U-G -- s, Dl VIS(6(-L Al Sbd .C=*__GF__jigus,€ --~-_.64/ALLEL- _ _ 70 -_27> UEW_ 7 +Lit*&#Cs m _ _149-_ -1 2 12 & ' _ARLK Action : ,24* 725 p/ 2 281*50,~PEr__ 60;Z*4*1Kf 2,@221- 40€P€ 222* --dp/d__ 27; _ 2>.7'A___4~f)- 2 -1.91* 1,47-6 - 7*15 9496 CL ' 1 66£24£ Pal,yvI '56,14.0 6 'da_FF 9 01* Signed MI24 94 0 . MESSAGE DISPLAY TO Engineering TO Parks TO Sara Thomas TO Suzanne Wolff From: Ross Soderstrom Postmark: Oct 28,96 4:26 PM Status: Previously read Subject: Winnerman River Bank Restoration Message: Larry Winnerman left a message that the river bank restoration work will begin in the next few days and we may stop by whenever to review the work. Larry Winnerman @ 920-1851. His contractor is Gary Carmichael @ 963-1436. The message was left this afternoon at approx. 3:5Op.m. 10/28/96. I L .. September 30,1996 ASPEN · PITKIN Larry Winnerman COMMUNITY DEVELOPMENT DEPARD{ENT 317 N. Park Ave.. Aspen, CO 81611 Dear Larry: With regard to the monitoring of the project required by the Planning Commission's approval of the Stream Margin Review, Community Development. Parks and Engineering staff request the following: 1. Provide a written construction schedule to Ross Soderstrom with the City Engineering Department prior to dommencement of any work. 2. Notify George Robinson at 920-5120 at least 24 hours before pouring any concrete. George will notify the Anny Corps o f Engineers and the Division of Wildlife. 3. Complete all work prior to May 30.1997. Please contact Ross Soderstrom at 920-5087 if you have any questions. Ross and George will monitor the project as requested, since I will be out of town. Sincerely, Suzanne Wolff Planner CC: Jay Hammond Ross Soderstrom George Robinson [30 SouTH G,Al.ENA STREET ASPEN, C'OLOR,ADO i 1611-1973 PHONE 970.920.3090 F.Ax 970.920.5439 ?rinte,1 ./ Recvc:ed Paoer .. MESSAGE DISPLAY TO Suzanne Wolff TO George Robinson TO carcs CC Dave Michaelson From: Ross Soderstrom Postmark: Sep 26,96 8:54 PM Status: Previously read Subject: Winnerman Restoration Work Message: In thinking about the monitoring of the Winnerman river bank restoration work after our meeting, I came up with a couple specific conditions: 1) That Winnerman provide us with a written schedule of the work before beginning; 2) all the work must be done before high water of spring 1997, that is, by Friday, May 30, 1997; 3) that he must give George Robinson at least 24 Hr notice before using any concrete so George may contact the Army Corp & DOW since each has regulatory interest in that portion of the work, ie. concrete in the water course. S.W., can you relay this to Winnerman before leaving? ~ ~7*° MEMORANDUM TO: Planning and Zoning Commission THRU: Dave Michaelson, Deputy Director Rkl . FROM: Suzanne Wolff, Planner RE: Winnerman Stream Margin Review DATE: September 1 7, 1996 SUMMARY: The applicant is requesting stream margin review approval to repair and stabilize the river bank which was damaged by the flooding ofthe Roaring Fork River in 1995. No work is proposed below the normal high water line. The application packet is attached as Exhibit A. Staff recommends approval of the stream margin review with conditions. APPLICANT: Larry Winnerman, represented by Jay Hammond LOCATION: 315-317 Park Ave. ZONING: R-6 PUD BACKGROUND: Stream Margin Review approval for the Whitcomb duplex was granted by the Planning Commission in August of 1990. City Council also granted Final PUD Development Plan approval by Ordinance No. 64. Series of 1990. These approvals allowed relocation ofthe irrigation culvert and revegetation to stabilize the bank. A stop work order was issued in June of 1993 for work which was not consistent with the approvals: the location ofthe culvert did not correspond with the approved location and boulders were placed on the stream bank. A stream margin amendment was subsequently approved by the Planning Commission by Resolution No. 93-20. It was determined that removal ofthe boulders would cause additional damage to the river bank, therefore, the bouiders and the culvert remained in place subject to specific revegetation requirements. REQUEST: The proposed repair work includes stabilizing the existing large boulders and keying in gabion baskets in the deeply eroded areas which will then be covered with soil. stabilized with a temporary erosion blanket, and revegetated. Concrete will be used to fill the voids behind the boulders to increase their stability. No work is proposed within the channel of the Roaring Fork River. All of the work is proposed to be done by hand or by using light equipment from the top ofthe bank, rather than accessing the bank with heavy equipment from the river. REFERRAL COMMENTS: Comments are attached as Exhibit B. Engineering Department: Since this application was first submitted in June, Engineering has spent a considerable amount oftime reviewing the restoration plan and the damage to the bank in an effort to determine whether the proposed repairs will adequately stabilize the bank and to ensure that the flood carrying capacity ofthe river channel is not impacted. Engineering has requested a restoration plan signed and stamped by a current Colorado registered professional engineer. - A a-4 6-«,0, p-ae-iA cle- 4 1494/ 9 -41 + fli 9 buffy- Parks Department: John Krueger, in his comments dated June 11, notes that the proposed scope of work does not seem sufficient to adequately stabilize the bank and prevent future damage, and suggests that working from the river may be necessary to repair the damage. George Robinson, in a meeting with the applicant and Planning staff on September 3, noted his concern with the use of gabion baskets filled by hand. He noted that gabions have failed and that the smaller material necessitated by handwork to fill the gabions would be less stable than larger boulders that could be keyed in to the bank, if heavy equipment was used in the river. Robinson also spoke with Mike Claffey ofthe Army Corps ofEngineers, who noted that he prohibited work below the normal high water line but that he did not and could not comment on whether or not the applicant should access the bank from the river. The applicant would be required to get permission from the City to enter the river above the Neale St. bridge. Robinson recommended willows as the best protection against erosion. and suggested that at least two levels of willows be planted and that the willows be at least 5 gallon size. The applicant shall submit a landscape plan to the Parks Department prior to issuance of a building permit for the bank restoration. STAFF COMMENTS: Pursuant to Section 26.68.040(B), "No development shall be permitted within 100 feet, measured horizontally, from the high water line of the Roaring Fork River and its tributary streams, or within the Special Flood Hazard Area where it extends beyond 100 feet from the high water line ofthe Roaring Fork River and its tributary streams, unless the Commission makes a determination that the proposed development complies with all the standards set forth below:' 1. It can be demonstrated that any proposed development which is in the Special Flood Hazard Area will not increase the base flood elevation on the parcel proposed for development. RESPONSE: The applicant has represented that no work will be done below the normal high water line, therefore, no increase in the base flood elevation should occur as a result of this work. 2. Any trail on the parcel designated on the Aspen Area Community Plan. Parks/Recreation/ Open Space/Trails Plan map, or areas of historic public use or access are dedicated via a recorded easement for public use. RESPONSE: A 5 foot fishing easement was required by the original PUD approval. 3. The recommendations of the Roaring Fork Greenway Plan are implemented in the proposed plan for development, to the greatest extent practicable; RESPONSE: Not applicable. 4. There is no vegetation removed or damaged or slope grade changes (cut or fill) made outside of a specijically dejined building emelope. A building envelope shall be designated by this review and said envelope shallbe barricaded prior toissuance ofany demolition, excavationor building permits. The barricades shall remain in place until the issuance of a Certificate of Occupancy. RESPONSE: Engineering requires fencing to delineate the boundaries of the work area. 2 f .. 5. The proposed development does not pollute or interfere with the natural changes of the river, stream or other tributary, including erosion and/or sedimentation during construction. Increased on-site drainage shall be accommodated within the parcel to prevent entry into the river or onto its banks. Pools or hot tubs cannot be drained outside of the designated building envelope; RESPONSE: Silt fencing shall be used to prevent any erosion or sedimentation from entering the river. A temporary erosion blanket will be placed over the revegetated areas. The applicant proposes to complete the work by hand and using light equipment, and does not propose to utilize heavy equipment in the river in order to avoid any disruption to the river channel. George Robinson has suggested that the applicant consider accessing the bank from the river since disruption would be minimal if the work was done this fall during low water, but did not require access from the river as a condition of approval. 6. Written notice is given to the Colorado Water Conservation Board prior to any alteration or relocation of a water course, and a copy ofsaid notice is submitted to the Federal Emergency Management Agency; RESPONSE: No alteration or relocation is proposed. A guarantee is provided in the event a water course is altered or relocated. that applies to the developer and his heirs, successors and assigns that ensures that the flood carrying capacity on the parcel is not diminished: RESPONSE: Not applicable. 8. Copies are provided ofallnecessaryfederai andstatepermits relating towork within the 100 year jloodplain: RESPONSE: A letter from Grady McNure ofthe U.S. Army Corps of Engineers is included with the application. The Winnerman's bank stabilization project is authorized under Regional General Permit No. GP37. Alan Czenkusch ofthe Division of Wildlife will review and approve the riparian vegetation that is reintroduced. 9. There is no development other than approved native vegetation planting taking place below the top of slope or within 15 feet of the top of slope or the highwaterline, whichever is most restrictive. RESPONSE: The existing duplex was constructed prior to adoption of this standard. The proposed repair - work will occur below and up to the top of slope. 10. All development outside the 15 foot setback.from the top of slope does not exceed a height delineated by a line drawn at a 45 degree anglefrom ground level at the top of slope. RESPONSE: Not applicable. 11. A landscape plan is submitted with all development applications. Such plan shall limit new plantings outside ofthe designated building envelope on the river side to native riparian vegetation; 3 .. RESPONSE: A landscape plan shall be reviewed and approved by the Parks Department prior to building permit approval. George Robinson recommends providing at least two levels of native willows (at least 5 gallon size) on the lowest portion ofthe slope adjacent to the river. Additional native riparian vegetation shall be used to revegetate the rest of the bank. 12. All exteriorlighting is low and downcastwith no light(s) directed toward the river or located down the slope; RESPONSE: Ordinance No 64, Series of 1990, requires that "Any outdoor lighting on the rear half ofthe lot be downcast, low wattage fixtures. If detached from the structure, light fixtures shall not exceed four feet in height." 13. Site sections drawn by a registered architect, lcmdscape architect, or engineer are submitted showing all existing and proposed site elements, the top ofsiope, and pertinent elevations above sea level: RESPONSE: A site plan and site section are provided with the application. 14. There has been accurate identification ofwetlands and riparian zones. RESPONSE: Not applicable. The applicant has requested to be allowed to perform minor repairs to the river bank without further stream margin review by the Commission or the Community Development Department. Staff is currently processing a code amendment to reinstate the stream margin review exemption, which would allow the Community Development Director to review and approye such repair work. therefore. staff does not support this request. + ho i.74 A l.u l/k-e·10(35 f-~ r ..4- STAFF RECOMMENDATION: Staffrecommends approval ofthe Winnerman stream margin review with the following conditions: 1. Prior to issuance of a building permit the applicant shall provide to the City Engineer three wet ink original blueline prints of the restoration design signed and stamped by a current Colorado registered professional engineer. Prior to the commencement of work. fencing delineating the boundaries of the work area shall be installed. Fencing shall be maintained until completion ofthe project. 3. A landscape plan shall be reviewed and approved by the Parks Department prior to building permit approval. Only native riparian vegetation is allowed. 4. All material representations made by the applicant in the application and during public meetings with the Planning and Zoning Commission shall be adhered to and considered conditions of approval, unless amended by other conditions. RECOMMENDED MOTION: "I move to approve the stream margin review at 315-317 Park Ave. with the conditions as outlined in the Community Development Department Memo dated September 17,1996". 6-v-(24 4px,~ C 5 ka,(i ly© Mdrfl-.7 - « gptdl~~,d h 0(-aff Mjec k_ 1/1/L,4 (.C».-rrth u 4 S W/22fL ..cd 5 A-1-7-1 4 w-nk- .. Exhibits: "A" - Application Packet "B" - Referral Comments Ajolve- De'(42_ - E~U~~t-L~Le-,W L - /7-1 )na F. . ~»-1~=h A- Ch-0/6 0-n /FI+A»1-3 --2_0/t,Oh-64_ 5 ~ SEP 0 9 1996 ~ Lorrie and Larry V\/innerman---- Telephone (970) 920-1851 Fax (970) 920-1853 317 Park Avenue Aspen, CO 81611 Date: September 6, 1996. TO: Suzanne Wolff - Planner From: Lawrence J. Winnerman Re: Winnerman Stream Margin Review Dear Suzanne, After our recent meeting, I am not*ing you that we are reinstating our stream margin review application for the repair ofthe riverbank at 315-317 Park Avenue in Aspen. Thank you for your attention in this matter. Sincerely yours, Lawrence J. Winnerman LJW/jk .. MEMORANDUM To: Suzanne Wolff, Planner Thru: Nick Adeli, City Eng~725 From: Ross C. Soderstrom, Project Engineer Di'<s Date: August 21,1996 Re: Winnernian Stream Margin Review (315/317 North Park Avenue, Riverside Subdivision, City of Aspen, CO) After reviewing the above referenced application and making a site visit with other City staff members, 1 am reporting the combined comments made by the members of the DRC: Recommendation: 1. Signed Plans: In light of the history of this property and the recent request to repair the river bank erosion, we will accept a restoration design signed and stamped by the applicant's engineer who is a current Colorado registered professional engineer. We request three (3) wet ink original blue-line prints; the plans do not need to be drawn on mylar. The performance of the designed improvements and the bank stability will rest with the applicant's engineering consultant. 2. Erosion and Sediment Control: Prior to the beginning of work, a non-disturbance line needs to be erected with fencing to delineate the work area boundaries as shown on the construction plans submitted with this application. The non-disturbance line must be securely maintained until completion of the project. 3. Regulatory Licenses and Permits: Prior to beginning work, the applicant must obtain the required licenses and permits from the Army Corps of Engineers and any other permits required to perform the work on the river bank. 4. Public Safety: Access to the work area needs to be delineated and controlled to prevent the un-authorized entry of pedestrians, fishermen, and other people in the river bed or on 1 OF 2 DRC13a96.DOC . Memo - Wii,zierinati Streai], Maryin 1~ ~ the river banks in or near the work areas from the beginning to the end of construction. The area shall be clearly posted with signs prohibiting entry of un-authorized people. Discussion: An original stream margin application would typically contain more information however due to the limited intent of this project, plans signed by the design firm's licensed professional engineer will suffice. 1. Topographic Improvement Plat Survey & Flood Elevations: Typically we would ask for cross-sections of the water surface elevations prior to and following proposed water channel work to confirm the flood carrying capacity of the channel and to comply with FEMA regulations however this application is for repair work that is to occur above the indicated 100 yr. flood plain. 2. Site Drainage: The restoration work can not release more than historic storm run-off (pre-development) flows from the site. A drainage plan prepared and certified by a Colorado Civil Professional Engineer for the lot would be included as part of the application package. 3. Construction Plan: A construction plan depicting the sequencing of tile construction, tillie duration. special procedures, and compliance with all conditions of the stream margin permit would be submitted to the Community Development Office. Any new utilities or utilities disturbed by the work which lie in the flood plane should be constructed or repaired with materials and utility equipment resistant to flood damage using methods and practices that minimize flood damage. 2 OF 2 DRC 1 3 396.DOC ENGINEERS . SURVEYORS bGM RO. Box 2155 (970) 925-6727 SCHMUESER FAX (970) 925-4157 GORDON MEYER - Aspen, CO 81612 August 20,1996 REd-*figb AUG 2 3 1996 Ms. Suzanne Wolff ----- Aspen/Pitkin County Community Development Department 130 South Galena Street Aspen, CO. 81611 RE: Winnerman Progerty, Roarina Fork River Bank Repair and Stabilization Proiect, Withdrawal of Stream Marain ADolication Dear Suzanne: This letter is being presented to withdraw the Stream Margin Review Application for a plan to repair the embankment adjacent to the Roaring Fork River at the Larry Winnerman property at 315/317 North Park Avenue in Aspen, Colorado. As you know, we had submitted a Stream Margin Review application back in May to undertake the repair of the river bank along the Roaring Fork River adjacent to Larry Winnerman's home which was damaged by the high runoff in the Spring and early Summer of 1995. As I have noted in our various conversations and as reflected in the application letter dated May 21,1996, I had been of the understanding, pursuant to a conversation with Chuck Roth of the City Engineering Department in the Fall of 1995, that this project to repair damage to the river embankment resulting from the high runoff would be eligible for a staff-level administrative sign-off for Stream Margin Review purposes. We learned prior to submitting the actual paperwork that the administrative level sign-off of minor Stream Margin projects was inadvertently left out of the current regulations and would require an approval by the Planning and Zoning Commission. While it remains Mr. Winnerman's desire to repair the damage to the embankment and restore the vegetation along the river corridor, and while approval of the project by the U.S. Army Corps of Engineers was promptly obtained in early May, recent conditions required by the City Engineering Department are unacceptable to our client. The City Engineer's office has indicated that a registered professional engineer must provide certification of the resulting structural integrity and stability of the embankment below the Winnerman home for any flow condition in the river channel. Our analysis of this requirement is that the existing dry-stack boulder wall cannot be certified and that a new structural wall would have to be constructed to below the scour depth of the Roaring Fork for the entire length of the Winnerman property along the river. Such construction and the resulting need to access the river channel with heavy equipment is directly contradictory to the concerns and requirements of the U.S. Army Corps of Engineers and Colorado Division of Wildlife with respect to the proposed bank repair (that work not occur below the water line of the river) and represents far more expense and impact than our client is willing to bear. We also question whether construction of a 118 West 6th, Suite 200 • Glenwood Springs, Colorado • (970) 945-1004 '7 .. August 20,1996 Ms. Suzanne Wolff Page 2 structural wall along the river is in fact what the Planning and Zoning Commission or citizens of Aspen would want to see at this location. At this point in time, concerned that we may already have lost the Fall construction season after nearly three months of review by the City, we are simply withdrawing our request for Stream Margin approval. Thank you for your assistance in this matter, please feel free to contact me if I may provide additional information or comment. Very Truly Yours, SCHMUESER GORDON MEYER, INC. ///37 KY- ( / Jay/W. Hammond, P.E. v Principal, Aspen Office JH/jh 96049SW2 CC: Gary Carmichael Larry Winnerman SCHMUESER GORDON MEYER, INC . 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MESSAGE DISPLAY TO Suzanne Wolff CC Nick Adeh CC carcs From: Ross Soderstrom Postmark: Aug 01,96 8:29 AM Status: Previously read Subject: Reply to: Winnerman Reply text: From Ross Soderstrom: Yes, Jay & I spoke for about 15 min. yesterday about my concerns for the river bank repair work, the house and river. I explained that the presence of the house makes the river bank a structural building pad for the house - to date not enough info about stability. Also drainage & irrigation, both now in bank & maybe contribute to instability.Anchorment of culvert & gabbian baskets into bank so as not to pull free. Top soil is aesthetic dressing. Jay understood my pt & is doing more research on structural aspect. No mtg time set yet. Preceding message: From Suzanne Wolff: Has Jay Hammond been in touch with you? ------- I .. III.. MEMORANDUM TO: Planning and Zoning Commission THRU: Dave Michaelson, Deputy Director FROM: Suzanne Wolff, Planner RE: Winnerman Stream Margin Review DATE: June 18, 1996 SUMMARY: The applicant is requesting stream margin review approval to repair and stabilize the river bank which was damaged by the flooding of the Roaring Fork River in 1995. No work is proposed below the normal high water line.The application packet is attached as Exhibit A. Staff recommends approval of the stream margin review with conditions. APPLICANT: Larry Winnerman, represented by Jay Hammond LOCATION: 315-317 Park Ave. ZONING: R-6 PUD BACKGROUND: Stream Margin Review approval for the Whitcomb duplex was granted by the Planning Commission in August of 1990. City Council also granted Final PUD Development Plan approval by Ordinance 64, Series of 1990. These approvals allowed relocation of the irrigation culvert and revegetation to stabilize the bank. A stop work order was issued in June of 1993: the location of the culvert did not correspond with the approved location and boulders were placed. A stream margin amendment was subsequently approved by the Planning Commission by Resolution No. 93-20. It was determined that removal ofthe boulders would cause additional damage to the river bank, therefore, the boulders and the culvert remained in place subject to specific revegetation requirements. REQUEST: The proposed repair work includes stabilizing the existing large boulders and keying in gabion baskets in the deeply eroded areas which will then be covered with soil, stabilized with a temporary erosion blanket, and revegetated with native willows and Red Osier Dogwood. Additional native riparian plants will be used to revegetate the river bank. No work is proposed within the channel of the Roaring Fork River, and all of the work will be done by hand or by using light equipment. REFERRAL COMMENTS: Comments from the Engineering Department are attached as Exhibit B. Engineering Department: Engineering is concerned that the erosion ofthe bank is a result ofthe previous "improperly designed and completed work". Specifically, the culvert was completely undermined and is not structurally restrained, and it appears that several of the boulders in the river bed have settled there as a result of the bank erosion and may be disrupting the historic river flow patterns. Concrete shall not be used to stabilize the boulders on the bank, and the rebuilt embankment shal~not exceed a slope of 1: 1. Engineering will require more specific information from the applicatien prior to issuance of a building permit, including a detailed construction plan, three cross-sections of the river: one at the approximate .. centerline of the work, and the other two 100 yards upstream and downstream ofthe centerline, photos of the river channel prior to construction, an embankment stabilization plan, and a drainage plan. Cross- sections and photos will also be required after completion.of the work. (Draft comments are attached to this memo; final comments will be available at the meeting.) STAFF COMMENTS: Pursuant to Section 26.68.040(B), "No development shall be permitted within 100 feet, measured horizontally, from the high water line ofthe Roaring Fork River and its tributary streams, or within the Special Flood Hazard Area where it extends beyond 100 feet from the high water line of the Roaring Fork River and its tributary streams, unless the Commission makes a determination that the proposed development complies with all the standards set forth below:" 1. It can be demonstrated that any proposed development which is in the Special Flood Hazard Area will not increase the base flood elevation on the parcel proposedfor development. RESPONSE: Cross-sections ofthe river channel shall be provided before and after construction to verify that the base flood elevation is not increased by the repairs. 2. Any trail on the parcel designated on the Aspen Area Community Plan, Parks/Recreation/ Open Space/Trails Plan map, or areas of historic public use or access are dedicated via a recorded easement for public use. RESPONSE: A 5 foot fishing easement was required by the original PUD approval. 3. The recommendations ofthe Roaring Fork Greenway Plan are implemented in the proposedplan for development, to the greatest extent practicable; RESPONSE: Not applicable. 4. There is no vegetation removed or damaged or slope grade changes (cut or fill) made outside Of a specifically defined building envelope. A building envelope shall be designated by this review and said envelope shall be barricaded prior toissuance ofany demolition, excavation or building permits. The barricades shall remain in place until the issuance of a Certificate of Occupancy. RESPONSE: Not applicable. 5. The proposed development does not pollute or interfere with the natural changes of the river, stream or other tributary, including erosion and/or sedimentation during construction. Increased on-site drainage shall be accommodated within the parcel to prevent entry into the river or onto its banks. Pools or hot tubs cannot be drained outside of the designated building envelope; RESPONSE: Silt fencing shall be used to prevent any erosion or sedimentation from entering the river. The construction plan shall explain the means and materials to be used to minimize sloughing of the bank. The applicant proposes to complete the work by hand and using light equipment, and does not propose to utilize heavy equipment in the river. 2 . .. 6. Written notice is given to the Colorado Water Conservation Board prior to any alteration or relocation of a water course, and a copy of said notice is submitted to the Federal Emergency Management Agency; RESPONSE: No alteration or relocation is proposed. 7. A guarantee is provided in the event a water course is altered or relocated, that applies to the developer and his heirs, successors and assigns that ensures that the.flood carrying capacity on the parcel is not diminished; RESPONSE: Not applicable. 8. Copies are provided ofallnecessaryfederal and state permits relating to work within the 100 year jloodplain; RESPONSE: A letter from Grady MeNure of the U.S. Army Corps of Engineers is included with the application. The Winnerman's bank stabilization project is authorized under Regional General Permit No. GP37. Alan Czenkusch ofthe Division of Wildlife will review and approve the riparian vegetation that is reintroduced. 9. There is no development other than approved native vegetation planting taking place below the top of slope or within 15 feet ofthe top ofslope or the high waterline, whichever is most restrictive. RESPONSE: Not applicable. 10. All development outside the 15 foot setbackfrom the top ofslope does not exceed a height delineated by a line drawn at a 45 degree angle from ground level at the top Of slope. RESPONSE: Not applicable. 11. A landscape plan is submitted with all development applications. Such plan shall limit new plantings outside ofthe designated building envelope on the river side to native riparian vegetation; RESPONSE: A landscape plan shall be reviewed and approved by the Parks Department prior to building permit approval. Only native riparian vegetation is allowed. 12. All exterior lighting is low and downcast with no light(s) directed toward the river or located down the slope; RESPONSE: Ordinance No 64, Series of 1990, requires that "Any outdoor lighting on the rear half of the lot be downeast, low wattage fixtures. If detached from the structure, light fixtures shall not exceed four feet in height." 13. Site sections drawn by a registered architect, landscape architect, or engineer are submitted showing all existing and proposed site elements, the top of slope, and pertinent elevations above sea level; 3 RESPONSE: Cross sections of the work area prior to and at completion of the work shall be provided to Engineering. 14. There has been accurate identification of wetlands and riparian zones. RESPONSE: Once completed, the work will improve the riparian area through and restoration of native vegetation. STAFF RECOMMENDATION: Staff recommends approval of the stream margin review with the following conditions: 1. Prior to issuance ofa building permit, the applicant shall provide the following information for approval by the City Engineer: • Detailed construction plan; • Three cross-sections of the river: one at the approximate centerline of the work, and the other two 100 yards upstream and downstream of the centerline, including the mean edge of water, mean edge of high water and flood elevations; • Photos of the river channel prior to construction,; • An embankment stabilization plan stamped and signed by a Colorado licensed geotechnical engineer; • Drainage plan. 2. Cross-sections and photos shall also be provided to the City Engineer after completion of the work. 3. Prior to the issuance of any building permits, the applicant shall comply with all requirements provided in the final referral comments ofthe City Engineering Department. 4. All material representations made by the applicant in the application and during public meetings with the Planning and Zoning Commission shall be adhered to and considered conditions of approval, unless otherwise amended by other conditions. RECOMMENDED MOTION: "I move to approve the stream margin review at 315-317 Park Ave. with the conditions as outlined in the Community Development Department Memo dated June 18,1996". Exhibits: "A" - Application Packet "B" - Referral Comments 4 .. MESSAGE DISPLAY TO Suzanne Wolff TO Rebecca Schickling CC Nick Adeh CC ross soderstrom CC John Krueger From: Ross Soderstrom Postmark: Jun 14,96 4:41 PM Subject: Boulder Removal Message: In thinking about how to remove the boulders from the river below the Winnerman property which may not be accessible thru the river, a contractor may use a pneumatic hammer powered by an air compressor on the river bank to bore holes in the boulders. An expansive plastic resin like Bristar may be injected into the holes to crack the boulders into smaller chunks that can be removed or moved about in the river or on the bank. I think the cost is competitive w/ blasting but w/0 the explosion and flying debris hazard. The broken boulder chunks could then be used for a rip-rap foundation at foot of bank. ./ Ik ~ Exhibit B DRAFT MEMORANDUM To: V~uzanne Wolff, Planner Thru: Nick Adeh, City Engineer Frorn: Ross C. Soderstrom, Project Engineer Date: June 12,1996 Re: Winnerman Stream Margin Application for Bank Stabilization and Repair (315/317 North Park Avenue, --- Subdivision, City of Aspen, CO) After reviewing the above referenced application and making a site visit I have the following comments: Discussion: In reviewing the site and previous files regarding this property. it is apparent that the present damage is a result of the previous improperly designed and completed work. I believe the work involved to properly stabilize and restore the river bank profile and vegetation will be more extensive than depicted by the material submitted in support of the application. We observed: A. The 18 inch CMP was completely undermined at the southern angle point nearest the river; the culvert had been previously bedded in native soil with only four (4) inches of cover rather than bedded in a select bedding material with known structural properties; there is no visible evidence that the culvert is structurally restrained with thrust blocks or tie backs at the angle points which were placed in the irrigation line during its previous unauthorized relocation. The culvert lies within five (5) ft of the foundation of the house patio. B. There are several large boulders on the remains of the eroded bank and in the river at the base of the bank. By their placement and size its apparent that these were moved to the river bank and either placed in the river or have settled there as a result of the bank erosion. The boulders in the river bed are disrupting the historic river flow patterns. 1. Topographic Improvement Plat Survey & Flood Elevations: Prior to issuance of the construction permit, the owner of this property shall show mean edge of water, mean edge of high water and flood elevations at three (3) cross-sections, with equal scales for the horizontal and vertical axis, DRAFT 1 OF 4 DRCM 1396.DOC Memo -iti'u-8rande-Park·Stream Margin 12~wi@*emptior (mean sea level; provide the name of the datum used) of the river cross sections where the work is proposed. The surveying will be performed by a land surveyor currently licensed in Colorado. Three (3) cross-sections of the river channel must be prepared prior to and after completing the work. One (1) cross-section shall be made at the approximate centerline of the work and the other two (2) cross- sections shall be made 100 yards upstream and 100 yards downstream of the approximate centerline of the work. The applicant shall provide color photographs of the river channel prior to and upon completing the work. In the event that the finished work varies substantially from the proposed cross-sections, length, width or depth of the work area, the applicant shall provide additional topographic information and HEC II analyses to accurately depict the actual water profiles downstream, at, and upstream of the work area. If the finished work adversely affects the water profiles in a manner that would cause flooding of previously un-impacted areas, the applicant shall remedy the conditions at his own expense. 2. Utilities: The submitted site plan does not indicate locations for these facilities however the applicant shall contact each utility prior to commencing work to verify utility locations and field locate those which are within the proposed work area. Any new utilities or utilities disturbed by the work shall be constructed or repaired with materials and utility equipment resistant to flood damage using methods and practices that minimize flood damage. 3. Site Drainage: The restoration work shall not release more than historic storm run-off flows from the site. A drainage plan for the entire lot shall be prepared as part of the application package. During the field visit I observed that an irrigation system had been installed in the embankment above the river. While this probably not the primary cause of the bank failure which is now to be repaired, the introduction and channeling of water on and over this steep embankment is a critical consideration in stabilizing the embankment and preventing future erosion and collapse ofthe embankment. Noting that the cross-section provided with the application is not drawn to scale, it does not accurately depict the actual field conditions. The embankment is approximately 2V:1H which exceeds the commonly accepted maximum stabile slope of 1V:1H. The proposed embankment stabilization plan must be stamped and signed by a Colorado licensed geotechnical engineer, submitted to and approved by the City Engineering Dept. prior to issuance of the construction permit. 4. Construction Plan: A detailed construction plan depicting the sequencing of the construction, time duration, special procedures, periodic review by City representatives, and compliance with all conditions ofthe stream margin permit will be submitted to the City Engineering Dept. for approval prior to issuance of the construction permit. DRAFT 2 OF 4 DRCM1396.DOC .. Memo -4Ue,Grande·Farle·Stpe6m Margin Review Pxrrm,ttorn The submitted proposal appears to call for concrete cementing of the pockets around the boulders to stabilize them. The boulders which were placed or have settled below the 100 Yr. flood elevation shall be removed from the water course if they interfere with the flow capacities of the river and cannot be stabilized in the river bed or embankment. Concrete cement will not be used for stabilizing the boulders. At the time of the field visit the boulders requiring stabilization were at the water line where a coffer dam would be needed to prevent concrete cement from entering the river. (In turn, a coffer dam would require working in the river bed itself and would be difficult to erect without large mechanical equipment.) To the extent feasible, the re-built embankment shall be constructed with a slope not exceeding 1V : 1H and preferably a slope of 1V : 2H or flatter, or in a terraced configuration, and/or with vegetation pockets for riparian landscaping. Rip-rapping materials shall be angular, not spherical with not less than two (2) fractured faces, to provide interlocking and greater friction surface areas, and of sufficient mass to remain in their placed positions. 5. Erosion and Sediment Control: The construction plan shall explain the means and materials to be used to minimize sloughing of the bank, (both new and existing soils and rip-rapping materials), during and following construction. Since-the construction is intended to be phaseds withhe-li;:st-phaselo occur in May, -1996*-prie,-10 the-annual-snowmelt and high-waterrprovision-shall-be made to-ensure that the work-areas-and adjacent arearare- fully-gtabilized-ind protected against normal high-Water-levels-- which may occur during_the--spring--FUn-ofAo-minimize further-erosion and-damage to the-work in- progress:_ Prior to the beginning of work, a non-disturbance line shall be erected with fencing to delineate the work area boundaries as shown on the construction plans submitted with this application. The non-disturbance line shall be securely maintained until written sign-off of completion for the project. Completion of the project shall include that work areas and all areas disturbed by the work, shall be compacted, stabilized with previously approved rip-rapping materials and re-vegetated with plant species previously approved by the Parks Dept. 6. River Bed Access: The access route(s) to and from the river bed shall be approved in writing by the Engineering Dept. prior to issuance of the construction permit. The applicant shall obtain prior written authorization from the property owner(s) who's property provides access to the river bed for personnel, materials and machinery, and loading and dumping operations. 7. Public Safety: Access to the work area shall be delineated and controlled to prevent the un-authorized entry of pedestrians, fishermen, and other people in the river bed or on the river banks in or near the work areas from the beginning to the end of construction. The area shall be clearly posted with signs prohibiting entry of un-authorized people. DRAFT 3 OF 4 DRCM1396.DOC Memo Jic-trance Fark Stream Margin Review'EEifi~Fri 8. Regulatory Licenses and Permits: Prior to beginning work, the applicant shall obtain the required licenses and permits from the Army Corps of Engineers, the Colorado Water Conservation Board (CWCB), the Federal Emergency Management Agency (FEMA), the Colorado Division of Wildlife (CDOW), and any other permits required to work in the water course. The applicant shall provide a copy of each license or permit to the City Engineering Dept. and fully comply with all requirements of each license and permit in addition to those requirements of the City. In the event of conflicting requirements, the more stringent requirement or standard shall control. The applicant will provide the required mapping and construction plans to each of the above agencies for approval after preliminary review and approval of the City Engineering Dept. Plans submitted to these agencies without prior City Engineering review will not be accepted. DRAFT 4 OF 4 DRCM!396.DOC . MEMORANDUN ~ JUN 3 3 4996 ~ TO: Suzanne Wolf-Community Development - FR: John D. Krueger-Parks Department Trails Supervisor DATE: June 11, 1996 RE: Winnerman Property Stream Margin Application, Roaring Fork River Bank Repair and Stabilization Project After reviewing the Winnerman application and a site visit to inspect the bank area we offer the following comments: We think the damage to the river bank is underestimated by the applicant in size and scope. The eroded area is larger and more severe than represented in the application and a proper repair will take more material than in the application. Small equipment and handwork will not be able to repair the damage. A track hoe with a skilled operator working in the river channel will probably be needed to repair the damage. The operator will probably need to access the river downstream to get to the bank damage and perform the work. A foundation of large boulders need to be placed in the river and then worked back up to the house. It would appear that the original design and bank work was insufficient. The steepness of the bank. location of the house and 18" culvert required a more substantial boulder wall to retain the bank. The boulders and rocks used were round and not sharp and angular so that they would interlock properly. As a result, several of the large boulders and many smaller rocks that were used in the bank have fallen into the river and are diverting some of the river ilow creating a potential future problem. If the original retainage to the river bank had been properly designed the high water would not have had an effect. The properties on both sides of the applicant have not sustained any damage from last years high water event. .. ASPEN/PITKIN PLANNING OFFICE 130 S. Galena Street Aspen, Colorado 81611 (970) 920-5090 FAX# (970) 920-5439 June 3, 1996 Jay Hammond, P.E. Schmueser Gordon Meyer, Inc. P.O. Box 2155 Aspen, CO 81612 Re: Winnerman Stream Margin Review Case A39-96 Dear Jay, The Planning Office has completed its preliminary review of the captioned application. We have determined that this application is complete. I have enclosed an Agreement to Pay form, please complete and return it as soon as possible. We have scheduled this application for review by the Aspen Planning and Zoning Commission on Tuesday, June 18. 1996 ata meeting to begin at 4:30 p.m. Should this date be inconvenieni for you please contact me within 3 working days o f the date of this letter. After that the agenda date will be considered final and changes to the schedule or tabling of the application will only be allowed for unavoidable technical problems. The Friday before the meeting date, we will call to inform you that a copy of the memo pertaining to the application is available at the Planning Office. If you have any questions, please call the planner assigned to your case, Suzanne Wolff, at 920- 5093. Sincerely, Rhonda Harris Administrative Assistant - MJNEERS , Exhibit A SURVEYORS 15(li~ . P.C. Box 2155 (970) 925-6727 SCHMUESER FAX (970) 925-4157 GORDON MEYER - Aspen. CO 81612 May 21, 1996 Ms. Suzanne Wolff Aspen/Pitkin County Community Development Department 130 South Galena Street Aspen, CO. 81611 RE: Winnerman Propertv Stream Margin Application, Roaring Fork River Bank Repair and Stabilization Proiect Dear Suzanne: Attached for your review and approval are twelve copies of a Stream Margin Review Application for a plan to repair the embankment adjacent to the Roaring Fork River at the Larry Winnerman property at 315/317 North Park Avenue in Aspen, Colorado. I direct this to you simply because we've had a couple of brief discussions regarding this project recently, As I have noted in our conversations, I had been of the understanding, pursuant to a conversation with Chuck Roth of the City Engineering Department in the Fall of 1995, that this project to repair damage to the river embankment resulting from the high runoff in the Spring and early Summer of 1995 would be eligible for a staff-level administrative sign-off for Stream Margin Review purposes. From our more recent conversation, it is my understanding that the administrative level sign-off of minor Stream Margin projects was left out of the current regulations and will require a, hopefully expedited, approval by the Planning and Zoning Commission. As I indicated in our phone conversation of this morning, I am submitting the most complete - Stream Margin Review package that I am currently able to provide for the Winnerman bank stabilization and repair project. As I noted this morning, Mr. Winnerman is currently out of the country and unavailable to us for a few weeks yet in providing items such as written authorization to apply for this review. Mr Winnerman did authorize our design work and submission of the permit request to the U.S. Army Corps of Engineers. I am currently assisting his Contractor, Mr. Gary Carmichael, in pursuing approval for the construction of the stabilization and repair project. In furtherance of our application and in response to the various requirements of the Stream Margin Development Application Package Contents document, I offer the following additional information; 1. Land Use Application Form: Enclosed as Attachment 1. 2. Minimum Submission Contents Owner: Mr. Larry Winnerman 317 North Park Avenue Aspen, CO. 81611 (970) 920-1851 118 West 6th, Suite 200 · Glenwood Springs, Colorado • (970) 945-1004 .. May 21, 1996 Ms. Suzanne Wolff Page 2 As noted above, I do not have a written authorization to submit this application on behalf of Mr. Winnerman at this time. Larry has certainly authorized our design work and efforts to date in acquiring the permit from the Army Corps. Proiect Site: 315/317 North Park Avenue in Aspen, Colorado. The property is located in Section 18 of Township 10 South, Range 84 West of the 6th P.M. in Pitkin County and is a condominiumized duplex under the name of 315/317 Park Avenue Condominium as recorded at Book 33, Page 50 of the records of the Pitkin County Clerk and Recorder. Given the minor nature of this approval request to repair river bank damage covered under a General Permit from the U.S. Army Corps of Engineers, I have not requested a full ownership disclosure statement from a Title Insurance Company at this time. Should you determine that such documentation is required, please let me know. Vicinitv Map: Attached Written Description of the Project: I have attached a copy of the cover letter dated April 24, 1996 that accompanied our application to Mike Claffey of the U.S. Army Corps of Engineers. This letter, along with the attached plan and section drawing, serve to describe the project. I should note that my initial application was under General Permit # 96-07, the Corps' approval, however, as the attached approval letter dated May 6,1996 from Grady McNure indicates, was issued under General Permit # GP37 (since GP 96-07 has not yet been finally issued). City Engineering should have a copy of GP37 with - regard to its general provisions, if not let me know and 1 can provide a copy. 3. Specific Submission Contents Proiect Plan: Attached. The project plan depicts the 100-year flood elevation and existing as well as proposed grades at two-foot intervals. The plan also demonstrates that this project is to restore the river embankment (and improve its vegetative cover and erosion resistance) and will not place habitable structures in proximity to the flood hazard. Construction Techniques: As noted in the letter to Mike Claffey, construction will utilize handwork and small equipment due to the access limitations to the work area. At Chuck Roth's recent suggestion, the Contractor will also place temporary erosion fencing above the high water line to prevent the introduction of sediment into the Roaring Fork River. I would stress that no work or disturbance is planned below the normal high water line. 4. Review Standards: For Stream Margin Review under Current Code Section 26.68.040, I think the attached materials address the various criteria. Generally; a. No increase in the base flood elevation will occur as a result of this bank restoration work. b. No alteration or relocation of the water course will occur. SCHMUESER GORDON MEYER, INC .. May 21, 1996 Ms. Suzanne Wolff Page 3 c. Our General Permit approval from the U.S. Army Corps of Engineers is attached. d. Riparian vegetation pursuant to the recommendations of Alan Czencusch of the Colorado Division of Wildlife is being reintroduced into the slope area as part of the project. I should note that our inclusion of riparian species per Alan's comments was the result of a phone conversation I had with him on April 24, 1996. At that time, Alan told me he was leaving town and was not able to provide written comment on the project. 5. Public Hearing Notice Requirements: Not Applicable. 6. Submission Fee: $450.00 staff approval deposR attached. I hope these items will be sufficient for an expedited Stream Margin Review approval through the Aspen/Pitkin Community Development Department and City Planning and Zoning Commission. Please feel free to contact me if I may provide additional information or comment. Very Truly Yours, SCHMUESER GORDON MEYER, INC. j -Jay *1. Hammond, P.E. Principal, Aspen Office JH/ih 9604@SW1 CC: Gary Carmichael Larry Winnerman SCHMUESER GORDON MEYER, INC DEPARTMENT OF THE ARMY U.S. ARMY ENGINEER DISTRICT, SACRAMENTO CORPS OF ENGINEERS 1325 J STREET SACRAMENTO, CALIFORNIA 95814-2922 REPLY TO ATTENTION OF May 6, 1996 Regulatory Branch (199675212) Mr. Jay Hammond Schmueser Gordon Meyer, Incorporated Post Office Box 2155 Aspen, Colorado 81612 Dear Mr. Hammond: We have reviewed your plan for a bank stabilization project on the Winnerman property on the Roaring Fork River at 317 North Park Avenue in Aspen, Colorado. The project site is located in Section 18, Township 10 South, Range 84 West, Pitkin County, Colorado. The Corps of Engineers, Sacramento District, has issued Regional General Permit Number GP37 to authorize certain limited discharges of dredged or fill material associated with streambank and streambed stabilization projects. Based on our review of the information submitted, the project is authorized by this regional permit subject to the enclosed permit conditions. This authorization is valid until May 11, 1999. We have assigned number 199675212 to your project. Please refer to this number in any correspondence with this office. If your plan to work extends beyond May 11, 1999, you must contact this office to receive an extension. If you have any- questions concerning this general permit, please contact Mr. Michael Claffey of this office at (970) 243-1199. Sinc«ely, j I ,;-l. b.,LGA, f.*' GrAdy L. McNure ~~Chi]65, Northwestern Colorado litgulatory Office 4 02~ Rood Avenue, Room 142 Grand Junction, Colorado 81501-2563 Enclosure . ENGINEERS SURVEYORS (970) 925-6727 GM - RO, Box 2155 SCHMUESER FAX (970) 925-4157 GORDON MEYER - Asoen, CO 81612 April 24,1996 Mr. Michael Claffey U.S. Army Corps of Engineers Sacramento District Western Colorado Regulatory Office 402 Rood Avenue, Room 142 Grand Junction, CO. 81501-2563 RE: Winnerman Propertv, River Bank Repair and Stabilization Dear Mike: Attached for your review and approval are three copies of a plan for the repair of the embankment adjacent to the Roaring Fork River at the Larry Winnerman property at 315/317 North Park Avenue in Aspen, Colorado. You may recall that we had a brief discussion regarding this project back in November of last year. The duplex residence at 315/317 North Park Avenue is a little over two years old. At the time of its original construction, work was done along the river embankment and large boulders placed on the slope in an effort to stabilize the slope area. High runoff conditions in the Spring of 1995 eroded the embankment and caused some sloughing of the slope up to the level of the residence. Since the residence is now in place, access to the embankment area is restricted with regard to the further use of heavy equipment. We are proposing a repair scheme whereby the large bouiders would be stabilized and gabion - baskets would be placed in the deeply eroded areas. The baskets would be filled with rock with handwork and, possibly, light equipment and then covered over with soil, revegetated and stabilized with a temporary-type erosion control blanket. Final grade conditions will be comparable to the grades that existed prior to the high runoff last year and no work is proposed within the channel of the Roaring Fork River itself, We are applying to you under General Permit # 96-07 for Army Corps permission to undertake this repair and stabilization work resulting from flood damage in the Spring of 1995. In furtherance of our application, I offer the following additional information; Proiect Site: 315/317 North Park Avenue in Aspen, Colorado as shown on the attached Vicinity Map. The property is located in Section 18 of Township 10 South, Range 84 West olthe 6th P.M. in Pitkin County. Owner: Mr. Larry Winnerman 317 North Park Avenue Aspen, CO. 81611 (970) 920-1851 118 West 6th. Suite 200 • Glenwood Sorinas. Colorado • 1970) 945-1004 .. April 24, 1 996 Mr. Mike Claffey Page 2 Engineer: Jay W. Hammond, P.E. Schmueser Gordon Meyer, Inc. P.O. Box 2155 Aspen, CO. 81612 (970) 925-6727 Contractor: Mr. Gary Carmichael Carmichael Construction P.O. Box 445 Carbondale, CO. 81623 (970) 963-1436 Proposed Work: As indicated above, the work is proposed to repair and restore the river embankment as a result of flood damage that occurred in the Spring of 1995. The area that has eroded represents a generally triangular-shaped area that is about 50 linear feet along the Roaring Fork River and tapers to a point near the Winnerman Residence. The eroded area is in the range of 18 to 24 inches deep and represents about 20 cubic yards of missing material interspersed with large boulders that remain from the initial slope work. We expect to excavate up to 10 additional cubic yards of material to key in the gabion baskets, then replace the eroded and excavated area with 30 yards of material including the rock-filled gabion baskets and cover soil. Due to the damage caused by the high-runoff in the Spring of 1995, the slope is essentially devoid of any vegetation at this time. Our plan is to revegetate the slope as part of this restoration work and the plan refers to the use of native willows and Red Osier Dogwood as plantings within the temporary erosion blanket. I spoke this afternoon With Alan Czencusch of the Colorado Division of Wildlife who was, at first, not supportive of the use of the gabion baskets. When I explained, however, that the baskets would not be placed within the river channel and that their use along the embankment would be covered with a soil and planting layer, he indicated that this approach was acceptable from his standpoint. He recommended the further use of Choke Cherry, streambank wheatgrass and crown vetch as additional riparian species appropriate to the site. He also suggested we confer with a local landscape designer for recommendations of native plants that may already be present within the area. The goal with regard to revegetation is to have plants that will assist in further stabilizing the embankment below Mr. Winnerman's residence while blending into the surrounding area and native species. Excavated material that is clean will be removed to the County Landfill or to properties available to Mr. Carmichael away from river or wetland areas. The sandbag remnants will be disposed of to the landfill. It is our intention to abide by the provisions of GP 96-07 with regard to this project. The Roaring Fork River is not listed as critical habitat for any of the Colorado endangered fishes nor are there any historic properties on the site. As noted, the project intent is to restore the embankment to its pre-flood contours and conditions using handwork and light equipment such as a bobcat loader that can access the top of the embankment around the house structure. No work is SCHMUESER GORDON MEYER, INC. .. April 24,1996 Mr. Mike Ciaffey Page 3 proposed in the river itself and no heavy equipment will be operated in the flowing water to generate increased turbidity or suspended solids. We hope you will find these items acceptable under GP # 96-07 for the Winnerman bank repair project. I have photographed the site as a record of the pre-construction conditions and will maintain a construction-phase and post-construction photo record as well. Please feel free to contact me if I may provide additional information or comment. Very Truly Yours, SCHMUESER GORDON MEYER, INC. 0 00»6 < ~day *. Hammond, P.E. - Principal, Aspen Office JH/ih 96048MC1 CC: Gary Carmichael Larry Winnerman RCHMUESER GORDON MEYER, INC 315/317 NORTH PARb ! 18" CMP IRRIGATION CULVERT EXCELSIOR STANDARD PLUS -t (OR APPROVED EQUAL) TEMPORARY EROSION CONTROL BANKET --ERODED SLOPE TOPSOIL, REVE-GE)74 TE· x~ I . ' SLOPE '2 7 EXIS11NG LARGE - ---0 -- %bHAND PLACED, ROCK dIKLE BOULDERS 100 YEARS \ 6~48/EW 84,5*279 hOOD EZE™ 77ON--- ---- CONCRETE VOIDS TO STABILIZE LARGE EXISTING NORMAL WATER \1 ... 1 . 1 ; BOULDERS LEVEL -C.Pr . 1 1 1 Il 1 1 11 It 11 1 1 1 1 , TYPICAL SECTION A-A N.T.S. i f ~ I , Fut i . 02 *6 - 1 I I ': 5 2,3 ? ..h tli t. W . .... , ·tiflt,· 79 31,1.-- . 1· -1- , 1 *~-- , ati -- -__~ -. - - - - - 4£*- t . ~ -- -- - --- -291 e.,8. -- 7 Uk RIVER ~ *031?IN~(0 .. m W 12 S. 0 92 i 3 13 1 . 'i:, 1.442/2*J*ki.242·t..3 ' I~ r . ·.9,1/ . ¢ . ,%.......4 NORTH PARK AL 315/317 ATIMHMENT 1 USE APPLICATION FORM 1) Pm j ect Nanie U~'t.Aerrv,A '€:fer 'S~a.A~q -K:~air Alt -64AX<1--aaAh'( -*Ajec,-t 2) Proj ect Location 315~317- hi, 911-k Ave,t/lee , Asp,e.,4 1 CO, Sflot' C ificate street address, lot & block number, legal description where appropriate) 3) Present Zoning NA 4) Lot Size - 5) Applicant's Nam, Ackiress & Phone # Mr. Larr~ \,divivt€rvt/WhA , 23,-2 #4. 1@~A<- Av e. A.#0*, CO. 9/611 (91· 0.) 97-0, rgsl 6) Representative's Name, Address & Fhane # Mr ._ \o. ·6~AIMMA.*44~1 41)(k,#Coeber- 6040-A Affe r, -33~., *Po Fo< 7. c :~-s-„ As~.Mi CO, S /6/z- 7) Type of Application (please check all that apply): (9903 915-- 6727 Corxlitional Use Concestlal SPA _ Conceptual Historic Dev. Special Review Final SPA Final Historic Dev. 8040 Greenline Conceptual POD Minor Historic Dev. __~ Stream Margin Final RJD Historic Demolition Mountain View Plane Subdivisian Historic Designation - Corxianiniumization _ Text/Map Amendment - (24@S Allotment Lot Spli-t/Lot Line · - 05 Exemption Adj ustment 8) Description of Existing Uses (rimber arid type of existing structures; approximate sq. ft.; number- of bedroans; any previous approvals granted to the property). ID° fle,x reSU©«Q-, (91 315(317 61. Parl Ae*ue , (0-,cbtr Jetti 1 Vi iq q·z5 9) Description of Development Application _filted.,wi Marl; . ~/ Admi *7 14rditie-~ sieg . 0.(Y 43 Ct -4..le.r- ~AA& S CO Sto·-1/\, im. ll~|~EK~~ 10) Have you attached the following? / Response to Attadiment 2, Miniann Submission Contents #*' Response to Attachment 3, Specific Submission Contents #4* Response to Attachment 4, Review Standards for Your Application .. 4 j N 44 \3 i «.r .\ -9 + A. 4 4.- 4 "4,4 4 & 21 403-90- -1 %4404 4604.4. MouuM- Dr k ~ <-31 ./4 Re , Ad - 4 & 4% 8,".I . 3 5 un., Cf ) Basall st.r" C sl./ .46.4 7 44 2 Alp.. 4 5 4, 4- Hur'Lic 4 . In#".I 4 / (4 *F* 1 Mu,IC y , 4 Tint f 0 Not all streets or roads are 82 0/0..p/. s, 1 Lake 94 of streets and roads may be In Y Hallam A named on maps. Construction 7 p d st .t·>. progress In certain areas. 4 4 10 - . 1 ·% 4 44 . 4 2 2 4-, '4 L?- 10 Aspen 6Uroon Cr-d Rd 0 . f 1 1 '4 4 c St * - SITE i I *1 b k 4 Hospital 4 6 .. .A 0 : 4 4 3* e - b 1 i C M.H I . St: c 04-7 * 0 4 ./ 4. 0 r 16 1% %24.21 - S t - 9 C : 9- g 10 82 *ed M 19 Aseen 18 3- Music SchocN 1)10{Intain To Twin (lakes VICINITY MAP SCHMUESER GORDON MEYER, INC. ENGINEERS & SURVEYORS 118 WEST 6TH, SUITE 200 GLENWOOD SPRINGS, COLORADO 81601 (970) 945-1004 ASPEN, CO. (970) 925-6727 315/317 N. PARK AVENUE JOB DATE ar SCALE APPRD 04. No. 960494 9.14·36 -Wb NONE JH loil M ariE-------Creck 91,00 le ChaIR•Ad Md <1 ,6 t JolunH M-dow. Ad 21,4 f «/»V/«1-///»701 3, 0/4 st C..im. Cr-k Md , A... Castle * F .. Copies Furnished: Ms. Sarah Fowler, U.S. Environmental Protection Agency, 8EPR-EP, 999 18th Street, Suite 500, Denver, Colorado 80202-2466 Mr. Keith Rose, U.S. Fish and Wildlife Service, 764 Horizon Drive, South Annex A, Grand Junction, Colorado 81506-3946 Mr. Paul von Guerard, Subdistrict Chief, U.S. Geological Survey, 402 Rood Avenue, Room 223, Grand Junction, Colorado 81501 Mr. Alan Czenkusch, Colorado Division of Wildlife, 473 Mountain Laurel, Aspen, Colorado 81611 City of Aspen, 130 South Galena, Aspen, Colorado 81611 .... 1 - SCALm 1== 10* 1 1. a757»VS CO'0770%(S COVT-OURS ~3€SEVT 844* EPOSOV DUE m H,GH FLOWS IN THE SPR,NG OF 1995. r ar CORFulATED •ETAL --1 01¥DulnoN 2. PROPOSED GRADES SEEK TO RESTORE THE RMER BANK TO CONDmoNS PR,OR TO THE SPRNG Of: 1995. £DGE. 0- ..7ZR ---. 3. EXISTING CONDITIONS ARE VARIABLE MTH MANY LARGE DIAMETER BOULDERS SCATTERED ON THE SLOPE PRNECT INTENT IS TO STABILLZE LARGE EXISTING BOULDERS AND FRI SPACES BETWEEN •TH GA8I0N BASKETS ALLED WAH MODERATE SIZED ANGUAR ROCK (450 - 129 AND COVERED Wl™ TOPSOE- 315/317 AND RtPARION-TYPE PLANTS. ij NORTH PARK mENUE 4. DUE TO ACCESS UWTATTONS TO THE ERODED SLOPE. THE CONTRACTOR WILL NEED TO PERFORM THE EXCAVATION AND GASION BASKET PLACEMENT i WrrH HAND-WORK AND UGHT EQUIPMENT. ACCESS UWITATIONS PREVENT THE USE OF LARGER MATERiALS OR RELOCADON OF EXJSTING BOULDERS. 18" C- IRRIGAnON n 94 4£ 1 ./.\- 4 0 1 1 5. STAND ALONE WELDED-WARE GABION BASKETS BY 664(CAFERR! OR CULVERT APPROVED EQUAL 6. SLOPE TO BE TOI'SOILED AND SEEDED WITH LOCAL RIPARMN SPECES PER THE COLO#&400 DMWON Of WILDUFE SEEDED SLOPE TO BE 11 1 EXCELSIOR STANEW?0 PLUS- CO,eED ImN AND atnSO¥ STIC,iD PL,5 ~M APPRO4ED al,MU !\ 1 1 TEMPORARy EROSION CONTROL BL-(ET. OPE-G ARE 70 BE CREATED AV 77€ £*aOV 20-TIT AAO PY-ED 1077¢ -17,E- ILLONS A~ ~ N : ~,¢660« - S~ \/ 7 (1 RED OSER DOG»OOD SEEDUNGS. , 111 1 1 :i 1 i 0 1.8 ERODED SLOPE » 315/317 .Af - TOPSOL ~Z,EGE,;4;E7 ... SLOPE \-4. 1 k NORTH PARK AVENUE 01571~ LARBY-r----~L'..,/~ \ 1 SOUL£ERS .1 -~22~HAND PLACED. ROCK FUED GABON 845*0675 1 I~E~VAnON ~ ~IL *4719? ~~_-_~~~ Ii~-STABUZE~ ~57Ny ~ G4aCW 845*Em AR=;UX-,z- PLACE14E~70' ,~~~~•4 693'xJ' ~ % ! lili 1 \ 1 ' 9'' /' TYPICAL SECTION A-A 47 1 ~ i M TS. 1 ?j 1 rt n % 1 11 f h. FOUO F*aiR k CAP j - 1 2 L.L._L 49 -You l 8018/JEI//9 GORDON AEYER IC ea,•84 1 *. 118 W. eth 8tr//t. Suite 200 \ elinwood Spil#(13. Colorado 81801 * d ~315/317 NORTH PARK AVENUE RIVER BANK REPAIR »·•FT " 1 1 ! UM, (303) 945-1004 (FAX 945-6948) -- AND STABILIZATION l...-,i % / i& Aspen. Colorado (308) 925-6727 y.- .- - . . ... ~.- .h ~r- ....'. ,....,-4 111 11 . , 1~ 99 5/, f 6-0-0--z~_ C i Ou,* 0* 73-2 An 2 14 0-no Ara Ng+ ke- A 6-(64-lf baefc. - 01-0-1-1606t-- --- »id - Flukup·"htk~-€j R~71 , *21- s ki.,4.4 V - 4866,0= 01 bJEC 51wcA- -_L~Al. h·<- 4,#ler 7 (4£.~U 1 bytd-GG-td amet, 40·fdy ~Do6(e -Py·24 6/pt b 1.1 - Wjievvf- _r.€VA kit-- p,UN&cA k ko-rn g»es-i« I ce-wc«v~ 1.,j' vit.4-u L ' ID 0 Lof(md p.«ce-4- 4 A-*\. d \P(+A ~01» kcu ken,# U.-/p 01 ajL~It-»4 1 1 -/ 1 i **,;« Wa-.0 6 54-.g *U- af ki.061 d 4 4&4+24 Ad -4 kd«~ AW'.-Ul u.jd« 1-2.-e W 4 4 ~f'YO - A. 41- 4 wa-.64 0/Al 14-4 {/Ilut (»0-,tu. (-Ul 6«6-*efd- 1,4 /U..2-9 J 2 Ign 4 690£ - 2-i ~ ~88-vus , In- 0-4- rEGA 8 Le-04': » -f-ue-*<:s g 3 934 1- •A .- 1 Il ili billit 0+L' .4/VAL/* 1/444"6:grIS -34 £-hj, r 7 tlt€-1 jr.,~ G A A.04- T l.XAN~ tly(/ RCL4 0-6.4- 'VL 6-r-€- el . - &44 ED /1.* 41-4 0-hyl Aa,Uy 40->€ 4 AU- %40 _~1» l« a---4. 4__4«- -1* _Di - It I,1 1:1 ,,1 HI ul"gd 9/- 7/49 Yio 7.-- .fI+9 o w ill _tp< tAno - rul L 1f1 j 1 11 li r . d -014 Fwgi 1.. 1 0 |l V7,-00"1 4.y Le~ Ir . 2, An rrv'-,rot 1 1- - -4 \-1 Jul 4 41 747/1/7 M,~ .. .. l.a,tt) DIfut,\.FI]Ii-I~ Lt?£ 03-*~C-r 4 L 0349 (~-~-;U clitu(_ 6(*169 =- 14492* P /:~ y©,52« *«-dr.cuvyol A-D(Aol 4- 4·-p 4 balt- i ka·1*1 Ou,L.• OA --¥GPO(· 6601~u~..000« 00 4 4 6,4- / 6 - ka-G - oe·02+Ufc Ma#- 5-A«- ot»_ 91 'tu» C.Lr- Avi .1 Jbla - 0, ~wnkl,l/3 6~ ~ di-ructo ptri V 0+4€04 ~ r- € r*putj u.» 6,09-ld-£ c #4 0-1 91 A.A*" ~ G.1 - 7 °C.-2- ft ~u»4.u_. 6~Ak / 4 0-4- Li.1-,£- 4-c«u-~ -<i cr#=0£-4- 1,Cu~ Lcu Awk- echR -1 0/1 231ru-0-Un w,L~-'J~\ 41Yr-%74 ~t~~~~U»+--4 - oug-~ - st-ch- 0--U _ck , 3 t FOUND REBAR & CAP < SCALE: 1" = 10' NOTES: 1. EXISTING CONDITIONS CONTOURS REPRESENT BANK EROSION DUE TO HIGH FLOWS IN THE SPRING OF 1995. 18" CORRUGATED WEDIL IRR/GATION 2. PROPOSED GRADES SEEK TO RESTORE THE RIVER BANK TO CONDITIONS PRIOR TO THE SPRING OF 1995. 3. EXISTING CONDITIONS ARE VARIABLE WITH MANY LARGE DIAMETER BOULDERS SCATTERED ON THE SLOPE. PROJECT INTENT IS TO STABILIZE LARGE EXISTING BOULDERS AND FILL SPACES BETWEEN WITH GABION BASKETS FILLED WITH EDGE OF WATER - - 315/317 MODERATE SIZED ANGULAR ROCK (d50 = 17) AND COVERED WITH TOPSOIL ' NORTH PARK AVENUE AND RIPARION-TYPE PLANTS. 1 1 illi \ / \\ l I} 4. DUE TO ACCESS LIMITAnONS TO THE ERODED SLOPE, THE CONTRACTOR WILL NEED TO PERFORM THE EXCAVATION AND GABION BASKET PLACEMENT WITH HAND-WORK AND LIGHT EQUIPMENT. ACCESS LIMITATIONS PREVENT & /0 4 4 4 11 THE USE OF LARGER MATERIALS OR RELOCATION OF EXISTING BOULDERS. i.. 1 10 / € 4' 18" CMP IRRIGATION 1 1 el 5. WELDED-WIRE GABON BASKETS BY MACCAFERm OR APPROVED EQUAL. 11 <I & k GABION BASKETS SHALL BE WIRED TOGETHER WHEREVER POSSIBLE TO : CUL WRT IMPROVE BANK STABILITY. 'i2' 121 1.4,34$ EXCELSIOR STANDARD PLUS-- ' ' 6. SLOPE TO BE TOPSOILED AND SEEDED WITH LOCAL RIPARIAN SPECIES (OR APPROVED EQUAL) PER THE COLORADO DIWSION OF MLDL/PE SEEDED SLOPE TO BE &4 , , TEMPORARY EROSION E-23 COVERED WITH AN EXCELSIOR STANDARD PLUS (OR APPROVED EQUAL) TEMPORARY EROSION CONTROL BLANKET. OPENINGS ARE TO BE CREATED IN THE EROSION BLANKET AND PLANED WITH NA771€ WILLOWS AND ~~ . 1 . EWS/NG CONTROL BANKET :.. HOUSE RED OSIER DOGWOOD SEEDLINGS. ERODED SLOPE TOPSOIL, REVEGEN rE 7. A DOUBLE ROW OF NATIVE TYPE WILLOWS (5 GAL.+) SHALL BE PLANTED 315/317 SLOPE WITHIN 5 FEET HORIZONTALLY OF THE NORMAL HIGH WATER LINE OF THE ROARING FORK RIVER. NORTH PARK AVENUE EX/SnNG LARGE k HAND PLACED. ROCK FILLED 8. A TEMPORARY SILT FENCE SHALL BE PLACED ABOVE THE HIGH WATER ~ h BOULDERS 100 YEARS GABION BASKETS LINE OF THE RIVER FOR THE DURATION OF THE REPAIR WORK. 1 ~' ' FLOOD ELEVATION - -- I f . GABION BASKETS NORMAL WATER U *1„ -CONCRETE VOIDS TO STABILIZE LARGE EXISTING BOULDERS (APPROXIMATE PLACEMENT) - LOEL I.'".I , 1; 1 l 6'*3'x3' . 0 LDOUBLE ROW OF WILLOW PLANTINGS \ \, tt THIS BANK REPAIR AND STABILIZATION PLAN HAS BEEN PREPARED IN COMPLIANCE WITH, THE COMMENTS AND RECOMMENDATIONS OF THE TYPICAL SECTION A-A U.S.ARMY CORPS OF ENGINEERS AND COLORADO DIVISION OF WILDLIFE N N.T.S. THAT NO WORK OCCUR BELOW THE WATER LINE OF THE ROARING FORK RIVER. · SCHMUESER GORDON MEYER, INC. MAKES NO REPRESENTATIONS REGARDING THE LONG TERM STRUCTURAL ADEQUACY OF THE RESULTING EMB~ KMENT IN FUTURE FLOOD CONDITIONS. It '\1 4 2 1 -JYW. D-4 , 1 - + 1 i C // 1.1 26078 U : 01 · I i 1 .. It 4*m,in„i,uw€0 6 FOUND REBAR & CAP it \ ·t 1 1, 31.94 •1 '1'•/ 3 42 42· LL . tR {8 M ' , NUM- ENGINEERS SCHMUESER GORDON MEYER INC. ' BER REVISION DATE BY Job No. 96049A - SURVEYORS RIVER BANK REPAIR Drown by: Fr 118 W. 6th Street, Suite 200 315/317 NORTH PARK AVENUE Dote 4/18/96 Glenwood Springs, Colorado 81601 (303) 945-1004 (FAX 945-5948) AND STABILIZATION Api)r. by: JH SCHMUESER GORDON MEYER ' File: JH96049 Aspen, Colorado (303) 925-6727 1 - C: \FT1\JH96049 Sun Sep 1 k ' 4 - FOUND RE-BAR & CAP SCALE: 1" = 10' NOTES: 1. EXISTING CONDITIONS CONTOURS REPRESENT BANK EROSION DUE TO HIGH FLOWS IN THE SPRING OF 1995. 18~ CORRUGATED METAL ~_~ IRRIGATION 2. PROPOSED GRADES SEEK TO RESTORE THE RIVER BANK TO CONDmONS PRIOR TO THE SPRING OF 1995. EPry OF »>17£-R ---~ //- 3. EXISTING CONDITIONS ARE VARIABLE WITH MANY LARGE DIAMETER BOULDERS 0%%If 11 7% Sgz-Sfmukr:N- &8=,SBTABI~~Z~~LAG* *§7NG 315/317 j MODE)54'Z- S/ZED ANGULAR ROCK (200 - 127 AND COVERED »9774 TOPSO/L AND RIPARION-TYPE PlANTS. 1,7 4. DUE TO ACCESS UM/TA77ONS TO ;HE ERODED SLOPE THE CONTE4CTOR ~ 1, / ;/ 2 WILL NEED m PERFORM THE EXCAVATION AND GABION BASKET PLACEMENT ~ WITH HAND-WORK AND UGHT EQUIPMENT. ACCESS UMITADONS PREVENT "1 tf . NORTH PARK AVENUE DYE USE OF LARGER MATEWMLS OR RELOC477ON OF- EX/SANG BOULDERS. ~ '~ & 4 41' 18" CMP IRRIGATION - il (1-Tiff 5. STAND ALONE WELDED-WIRE GABION BASKETS BY MACCAFERRI OR i ta £ ! 1 . APPROVED EQUAL CULVERT :i @ 6. SLOPE TO BE TOPSOILED AND SEEDED W/m LO,24£ RIPARIAN SPECIES ~) ~* ~ PER THE COLORADO DIVISION OF WfLDLIFE. SEEDED SLOPE TO BE EXCELSIOR STANDARD PLUS-- COVERED WITH AND EXCELSIOR STANDARD PLUS (OR APPROVED EQUAL) r - (OR APPROVED EQUAL) -\ 72-MPORARY EROS/ON CONTRot mANKEE OPEN/NG ARE 70 BE CREATED t11* 1% ~ 1 · 7EMPORARY EROSION [13 4 L IN THE EROSION BLANKET AND PLANTED WITH NATIVE WILLOWS AND .4 - - CONTROL BANKET 4 EXISTING RED OSIER DOGWOOD SEEDUNGS. . · HOUSE 1 ~! - ---ERODED SLOPE 1 \ : ropsol, REI€GE7A ;E-\\ 315/317 SLOPE ./ NORTH PARK AVENUE \ 1 1 EXISTING LARGE- - .>HAND PLACED ROCK FILLED 1 BOULDERS 100 YEARS N. GASION BASKPTS 1 43/ -4 i. FLOOD ELE14477ON 9- 2/' ' _--- CONCRETE VOIDS TO ' NORMAL WATER 31 -1 BOULDERS GABON BASKETS --- - STABILIZE LARGE EXISTING (APPROXIMATE PLACEMENT) 6- LEVEL 6'*3'xy .... ) 0 ~ 1 f £\ 4% TYPICAL SECTION A-A 4 1 8 N. ES. 1 1 \ 4 \GA La ! ' i '' 1 1 111 \ 401 1\ 1.\1 Ke 6 5 1 k i 1 : iii 1.1 r -- FOUND REBAR & CAP 1 1 ... m {n N ·31 - 2 CD t.: G '· C i L.1 0, 0, W NUM- r ENGINEERS SCHMUESER GORDON MEYER INC. 1 BEN REVISION DATE BY Peb No. 96049A S~NORS RIVER BANK REPAIR\Druwn bM Fr X / m 118 W. 6th Street, Suite 200 315/317 NORTH PARK AVENUE?i 22 JGM Glenwood Springs, Colorado 81601 4/18/96 (303) 945-1004 (FAX 945-59481 1 AND STABILIZATION ~ Appr. by: J H CS) SCHMUESER 9. 2 Fiks: J#196049 GORDON MEYER _a Aspen, Colorado (303) 926-6727 / OF 1 C> . - I _727 4. RAIN ..~16./.' .