HomeMy WebLinkAboutcoa.lu.sm.Rio Grande Park.A26-96 •
CA OAD SUMMARY SHEET- CITY 111111ASPEN
DATE RECEIVED: 3/25/96 CASE# A26-96
DATE COMPLETE: STAFF: Suzanne Wolfi
PARCEL ID# 2737-073-06-851
PROJECT NAME: Rio Grande Park Stream Margin Exemption
Project Address: Trail & inlet channel near Rio Grande Park on Roaring Fork River
APPLICANT: City of Aspen Parks Department-Rebecca Baker
Address/Phone:
REPRESENTATIVE: Same
Address/Phone:
FEES: PLANNING $0 #APPS RECEIVED 2
ENGINEER $0 #PLATS RECEIVED 2
HOUSING $0
ENV HEALTH $0 TYPE OF APPLICATION:
TOTAL - $0 pprov
-.A Gee S-
Review Body. Meeting Date j Public Hearing?
P&Z ❑Yes [No
CC • ❑Yes ❑No
CC (2nd reading) ['Yes ❑No
REFERRALS:
❑ City Attorney ❑ Aspen Fire Marshal ❑ CDOT
M City Engineer ❑ City Water ❑ ACSD
❑ Zoning ❑ City Electric ❑ Holy Cross Electric
❑ Housing ❑ Clean Air Board ❑ Rocky Mtn Natural Gas
❑ Environmental Health ❑ Open Space Board ❑ Aspen School District
❑ Parks ❑ Other: ❑ Other:
DATE REFERRED: `t 6 INITIALS: _ DATE DUE: 'I
APPROVAL: Ordinance/Resolution# Date:
Staff Approval Date:
Plat Recorded: Book , Page
CLOSED/FILED DATE: /q- INITIALS: 117C—
ROUTE TO: ✓ V.12
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RESOLUTION OF THE ASPEN PLANNING AND ZONING COMMISSION
FOR THE APPROVAL OF THE RIO GRANDE PARK STREAM MARGIN REVIEW
Resolution No. 96- /7
WHEREAS,pursuant to Section 26.68.040 of the Aspen Municipal Code, the Planning
and Zoning Commission may grant approval for development within 100 feet, measured
horizontally, from the high water line of the Roaring Fork River and its tributary streams, if the
development is determined to be in conformance with the requirements of said Section; and
WHEREAS,the Community Development Department received an application from the
City of Aspen Parks Department for Stream Margin Review approval to repair and stabilize areas
adjacent to Rio Grande Park and the Rio Grande Trail which were damaged by the flooding of the
Roaring Fork River in 1995; and
WHEREAS, the City Engineering and Community Development Departments reviewed
the proposal and recommended approval with conditions; and
WHEREAS,the Commission reviewed and approved the Stream Margin Review with
conditions by a 5-0 vote on April 23, 1996; and
NOW,THEREFORE,BE IT RESOLVED by the Commission that it does hereby
approve the Rio Grande Park Stream Margin Review with conditions as follows:
1. The applicant shall inform the property owners of the adjacent and opposing river banks,
upstream and downstream of the work to coordinate work to minimize disturbance in the river
(specifically the Moore family and the Aspen Consolidated Sanitation District).
2. The applicant shall provide 3 cross sections of the work area prior to and at completion of
the work: one at the approximate centerline of the work, and the other two 100 yards upstream and
downstream of the centerline.
3. The applicant shall provide before and after photos of the work area and of the opposite
river banks to the Engineering Department.
4. The applicant shall restore the Rio Grande Trail to its present condition or better by October
1, 1996.
5. Silt fencing shall be used to prevent any erosion or sedimentation from entering the river.
6. Provisions shall be made to ensure that the work areas are fully stabilized prior to high
water to minimize damage before the areas are revegetated after high water.
7. The Engineering Department shall approve the access route to and from the river bed prior
to issuance of a construction permit.
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8. Access to the work area shall be delineated and controlled to prevent unauthorized entry
into the work area.
9. All representations of the applicant are considered conditions of approval.
APPROVED by the Commission at its regular meeting on April 23, 1996.
ATTEST: PLANNING AND ZONING COMMISSION:
/ 41,0 Ordir_44:iC, _8—
1,kie Lothian, Deputy City Clerk Sara Garton, Chair
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MEMORANDUM
TO: Planning and Zoning Commission
FROM: Suzanne Wolff,Planner
RE: Rio Grande Park Stream Margin Review
DATE: April 23., 1996
SUMMARY: The applicant is requesting approval to repair and stabilize areas adjacent to Rio
Grande Park and the Rio Grande Trail which were damaged by the flooding of the Roaring Fork
River in 1995.
APPLICANT: City of Aspen Parks Department,represented by George Robinson&Rebecca
Baker
LOCATION: Roaring Fork River adjacent to Rio Grande Park
ZONING: Public/Specially Planned Area(SPA)
PROJECT DESCRIPTION: The erosion of the river bank during the flooding in 1995 removed
a section of the Rio Grande Trail. Emergency repairs were performed to stabilize the bank and
maintain the trail. The Parks Department proposes to re-work the rock embankment to improve the
structural integrity of the bank,and to extend the rock embankment upstream and downstream of
the failed area to provide reinforcement. Repairs are also proposed to the inlet to the island and
along the channel of the kayak course. Rock work will be completed this spring before high water,
and revegetation will occur after high water. Alan Czenkusch, Colorado Division of Wildlife, will
supervise the project. The application and drawings of the proposed repair work are attached as
Exhibit"A".
REFERRAL COMMENTS: Detailed comments from the City Engineering Department are
attached as Exhibit"B", and are included in the staff comments below.
STAFF COMMENTS:
Stream Margin Review: Pursuant to Section 26.68.040,the criteria for stream margin review are
as follows:
A. No development shall be permitted within the floodway, with the exception of bridges or
structures for irrigation, drainage,flood control or water diversion, which may be permitted by the
City Engineer,provided plans and specifications are submitted to demonstrate that the structure is
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engineered to prevent blockage of drainage channels during peak flows, and the Commission
determines that the proposed structure complies, to the extent practicable, with all the standards
set forth below.
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 of the Roaring Fork River and its
tributary streams, unless the Commission makes a determination that the proposed development
complies with 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.
This shall be demonstrated by an engineering study prepared by a professional engineer registered
to practice in the State of Colorado which shows that the base flood elevation will not be raised,
including, but not limited to,proposing mitigation techniques on or off-site which compensate for
any base flood elevation increase caused by the development.
RESPONSE: The repairs will not increase the base flood elevation.
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: The repairs will prevent further damage to the existing Rio Grande trail.
3. The recommendations of the Roaring Fork Greenway Plan are implemented in the
proposed plan for development, to the greatest extent practicable;
RESPONSE: The repairs proposed in this application are consistent with the Rio Grande Master
Plan(1993),which incorporates recommendations from the Greenway Plan.
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 to issuance of any demolition, excavation or
building permits. The barricades shall remain in place until the issuance of a Certificate of
Occupancy.
RESPONSE: The applicants propose to revegetate the areas with native plants to control further
erosion after the rock work is completed. The re-built embankment will have a less severe slope
than the existing embankment, and the Parks Department is proposing to relocate the pedestrian
trail farther away from the top of the new embankment.
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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. Provisions shall be made to ensure that the work areas are fully stabilized prior to high water
to minimize damage before the areas are revegetated after high water.
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 of all necessary federal and state permits relating to work within the
100 year floodplain;
RESPONSE: The repair work is authorized by Army Corps of Engineers nationwide permit
number 13 for bank stabilization. The erosion at the kayak course is authorized as part of the
maintenance required under the permit issued for the course. A letter from the Corps of Engineers
is included in the attached application.
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 high waterline, whichever is most
restrictive.
RESPONSE: Not applicable. ■
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 angle from ground level at the top of slope.
RESPONSE: Not applicable.
3
11. A landscape plan is submitted with all development applications. Such plan shall limit new
plantings outside of the designated building envelope on the river side to native riparian
vegetation,
RESPONSE: Only native vegetation(dogwood, roses,willows, serviceberry, alders) is proposed,
as shown in the drawings in the application packet.
12. All exterior lighting is low and downcast with no light(s) directed toward the river or
located down the slope;
RESPONSE: Not applicable.
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;
RESPONSE: The Engineering Department has required the applicant to provide 3 cross sections
of the work area prior to and at completion of the work: one at the approximate centerline of the
work, and the other two 100 yards upstream and downstream of the centerline. Engineering also
requests before and after photos of the work area and of the opposite river banks.
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. The applicant shall inform the property owners of the adjacent and opposing river banks,
upstream and downstream of the work to coordinate work to minimize disturbance in the
river(specifically the Moore family and the Aspen Consolidated Sanitation District).
2. The applicant shall provide 3 cross sections of the work area prior to and at completion of
the work: one at the approximate centerline of the work, and the other two 100 yards
upstream and downstream of the centerline.
3. The applicant shall provide before and after photos of the work area and of the opposite
river banks to the Engineering Department.
4. The applicant shall restore the Rio Grande Trail to its present condition or better by October
1, 1996.
5. Silt fencing shall be used to prevent any erosion or sedimentation from entering the river.
6. Provisions shall be made to ensure that the work areas are fully stabilized prior to high
water to minimize damage before the areas are revegetated after high water.
4
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7. The Engineering Department shall approve the access route to and from the river bed prior
to issuance of a construction permit.
8. Access to the work area shall be delineated and controlled to prevent unauthorized entry
into the work area.
9. All representations of the applicant are considered conditions of approval.
RECOMMENDED MOTION: "I move to approve the stream margin review for the repairs to
the embankment and the island in the Roaring Fork River at the Rio Grande Park, with the
conditions as outlined in the Community Development Department Memo dated April 23, 1996".
Exhibits:
"A" -Application Packet
"B" -Referral Comments
5
4 Exhibit A
March 25, 1996
Stan Clauson
Community Development Director
City of Aspen
130 S. Galena St.
Aspen,CO 81611
Dear Stan,
We are requesting approval for a stream margin exemption for the purpose of
repairing the trail and inlet channel near Rio Grande Park on the Roaring Fork River.
Both of these areas were damaged by the high water events in the spring/summer of 1995.
The repairs will include re-working the rock embankment to improve the structural
integrity of the bank and then re-vegetate the slopes with native plants to control future
erosion. We will be doing similar work at the inlet to the island, as well as stabilizing
and re-armoring a few areas along the channel and island.
We have received Army Corps of Engineers approval under a nationwide permit
number 13 to complete this work. We have attached a copy of their letter, dated
November 21, 1995. We will also send a duplicate of this letter and the Army Corp of
Engineers letter to the Colorado Water Conservation Board and the Federal Emergency
Management Agency detailing our intentions.
Julia Marshall of Mt. Daly Enterprises has prepared illustrative drawings of the
areas for the repairs that are attached for your review. An 8 1/2 X 11 project location map
is included as well.
In conjunction with this project we will be doing other upgrades and
improvements to the Lower Rio Grande River park and realigning the trail through the
park, per the recommendations of the Rio Grande Master Plan and the City Council.
Since some of this cosmetic work is within 100 feet of the river, a full stream margin
application will be submitted for approval. However, in order stabilize the banks and the
island for high water this year, we are requesting a separate application for exemption for
the rock work in the river to be completed in April and May. An 11 x 17 drawing of the
overall Rio Grande plan is attached as Exhibit `C', to show the general plan for the area.
The following are some of the items that may be reviewed under the forthcoming stream
margin review:
• •
* Realignment of the trail to improve sight distances and even the grade of the
trail.
* Enlarge the sand filtration ponds and improve their general appearance.
* Replace the Oklahoma Flats Bridge for clearance of high water events.
As stated above, these improvements were recommended in the Rio Grande
Master Plan, except for replacing bridge which is being done for safety reasons. We have
also presented these plans to the group working on the trolley to ensure the changes can
work with a possible trolley layout.
The delay for the stream margin application is to determine the status of the
Oklahoma Flats Bridge abutments. We are hoping an engineer will be available to
inspect it in the next week or so. We believe the full stream margin application will be
ready for submittal within the next 2-3 weeks.
Thank you for taking the time to review our request. If you have any questions
regarding the proposal, please contact myself or George Robinson at 920-5120.
Sincerely,
Rebecca Baker.
Assistant Parks Director
City of Aspen
Attachments: Exhibit `A' - Army Corp of Engineers Letter
Exhibit `B' - Project Location Map
Exhibit `C' - Rio Grande Park General Plan
Exhibit `D' - Illustrative Drawings of Repairs (6)
Exhibit `E' - Letters to FEMA & Colo. Water Conservation Board
SMR_LRG.doc
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Exhibit 'A'
•• of • DEPARTMENT OF THE ARMY •
A 1''• U.S.ARMY ENGINEER DISTRICT,SACRAMENTO
w = `=`' y CORPS OF ENGINEERS
• 'a. 1325 J STREET
� 7 REPLY TO SACRAMENTO,CALIFORNIA 95814-2922
• Attsat'a" ATTENTION OF
November 21, 1995
Regulatory Branch (199475278 & 199200308)
Mr. George Robinson
City of Aspen
130 S. Galena Street
Aspen, Colorado 81611
Dear Mr. Robinson:
•
We are responding to your request for authorization for the
repairs to the Rio Grande Trail embankment along the Roaring Fork
River just upstream of the kayak course inlet. The river bank
eroded away at high water this year removing portions of the
trail and creating a significant safety hazard for the public.
You contacted this office by telephone and we approved the repair
of the river bank to maintain the trail. The project is located
along the Roaring Fork River in the City of Aspen, Pitkin County,
Colorado.
On August 19, 1995, Mr. Michael Claffey met with you, your
staff and Mr. Alan Czenkusch of the Colorado Division of Wildlife
to review the emergency repair work at the Rio Grande trail. The
work involved the discharge of less than one cubic yard of
material per running foot of bankline below ordinary high water.
As such, the repair work is authorized by Department of the Army
nationwide permit number 13 for bank stabilization. However,
when viewed from the opposite side of the river, Mr. Claffey
agreed with the group that the rock work appears unstable due to
the amount of voids between rocks and the use of rounded rock in
some locations. Due to the safety considerations involved with
the use of the trail, you are directed to rework the rock to
create a more stable bank. In addition, you must remove some of
the soil placed on the top of the bank or stabilize this soil to
prevent the release of sediment into the river. The reworking of
the rock below ordinary high water is authorized by nationwide
permit number 13 and additional approval from this office is not
required.
•
The group also reviewed the erosion to the entrance to the
inlet of the kayak course and the river bank at the midpoint of
the course. You are authorized to repair the erosion at the
course as part of the maintenance required under the Department
of the Army permit issued for the course (199200308) . You should
submit a set of drawings, on how this work will be accomplished.
During the same site visit, the group reviewed the Oklahoma
Flats pedestrian bridge upstream of the repaired river bank. Mr.
Claffey agrees that the bridge does not have sufficient freeboard
above the high water elevation and presents a safety problem for
trail users during high water events. We suggest that the City
raise the bridge elevation to reduce this safety hazard. If the
repair work to the- bridge requires the discharge of fill material
below ordinary high water for construction or temporary access, a
Department of the Army permit will be required. There are
several nationwide permits available for this type of work.
If you have any questions, please write to Mr. Michael Claffey at
the address below or contact him by telephone at (970) 243-1199.
Sincerely,
Gr y McNure
Chief orthwestern Colorado
Regulatory Office
402 Rood Avenue, Room 142
Grand Junction, Colorado 81501-2563
Copies Furnished:
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, 453 Mountain
Laurel, Aspen, Colorado 81611
2.
Exhibit ' B'
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AREA #1
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October25, 1995 N.T.S.
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LOWER RIO GRANDE PARK
EROSION CONTROL ON KAYAK COURSE
AREA #3
Prepared By:
ML Daly Enterprises
October 25,1995 N.T.S.
. • .
•
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LOWER RIO GRANDE PARK
EROSION CONTROL ON KAYAK COURSE
AREA #4
Prepared By:
ML Daly Enterprises
October25, 1995 N.T.S.
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LOWER RIO GRANDE PARK
EROSION CONTROL BEGINNING
OF KAYAK COURSE
AREA #5
Prepared By:
Mt Daly Enterprises
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' LOWER RIO GRANDE PARK
RECONSTRUCTION AND REVEGETATION
OF ERODED AREA BELOW TRAIL
AREA #6
•
Prepared By:
Mt.Daly Enterprises
October 23,1995 N.T.S.
. ,
Exhibit 'E'
•
March 26, 1996
Federal Emergency Management Agency
Region 8
Denver Federal Center
Building 710, Box 27657
Denver, CO 80225-267
To Whom it May Concern,
The City of Aspen Parks Department has submitted a Stream Margin Exemption
application to our Community Development Department for the purpose of repairing a
stream bank and diversion channel island that were damaged by the high water event of
1995. The repair work includes re-working the rock embankment to improve the
structural integrity of the bank and then re-vegetate the slopes with native plants to
control future erosion. We will be doing similar work at the inlet to the island,as well as
stabilizing and re-armoring a few areas along the channel and island. We are proposing
to begin work in May before high water for this year. We have received Army Corp of
Engineers approval under a nationwide permit number 13 to complete this work.
Attached are the following:
1. Letter to Stan Clauson, Community Development Director Requesting
Stream Margin Exemption
2. Army Corp of Engineers Letter, dated 11/21/95
3. Project Location Map
4. 11 x 17 General Plan Map
5. 6 Illustrative drawings of repair work
If you have any questions regarding the information provided please contact us at
(970)920-5120. Thank you for your time to review this material.
Sincerely,
Rebecca Baker
Assistant Parks Director
City of Aspen
e • •
March 26, 1996
Colorado Water Conservation Board
Division of Water Resources
50633 Hwy 6 & 24
Glenwood Springs, CO 81601
To Whom it May Concern,
The City of Aspen Parks Department has submitted a Stream Margin Exemption
application to our Community Development Department for the purpose of repairing a
stream bank and diversion channel island that were damaged by the high water event of
1995. The repair work includes re-working the rock embankment to improve the
structural integrity of the bank and then re-vegetate the slopes with native plants to
control future erosion. We will be doing similar work at the inlet to the island, as well as
stabilizing and re-armoring a few areas along the channel and island. We are proposing
to begin work-in May before high water for this year, We have received Army Corp of
Engineers approval under a nationwide permit number 13 to complete this work.
Attached are the following:
1. Letter to Stan Clauson, Community Development Director Requesting
Stream Margin Exemption
2. Army Corp of Engineers Letter, dated 11/21/95
3. Project Location Map
4. 11 x 17 General Plan Map
5. 6 Illustrative drawings of repair work
If you have any questions regarding the information provided, please contact us at
(970)920-5120. Thank you for your time to review this material.
Sincerely,
Rebecca Baker
Assistant Parks Director
City,of Aspen
' ' • •
MEMORANDUM
To: Suzanne Wolff, Planner
Thru: Nick Adeh, City Engineer
From: Ross C. Soderstrom, Project Engineer
Date: April 24, 1996
Re: Rio Grande Park Stream Margin Review Exemption
(Rio Grande Park, Rio Grande Subdivision,City of Aspen, CO)
After reviewing the above referenced application and making a site visit I have the following comments:
Discussion:
Through conversations with the City Parks Dept. I understand that the original proposed scope of work
has been reduced due to timing of the work with the spring snowmelt and availability of consultants to
review the Oklahoma Flats pedestrian bridge. At present the proposed scope of work to be begun
immediately (prior to the snowmelt) is the reconstruction of the boulder rip-rap embankment on the south
bank of the outside curve of the Roaring Fork River immediately below Rio Grande Place (and Recycle
Center) in work area 6, and select bank reconstruction, armoring, erosion preventative rock features and
limited bottom dredging to remove flood deposited materials in work areas 1 through 5. Re-vegetation
with native riparian species shall be performed in these areas following the spring snowmelt this year. If
permissible by timing and coordination with the Aspen Consolidated Sanitation District (ACSD),
additional spot re-construction work may be performed upstream of.work area 6 extending to the
Oklahoma Flats pedestrian bridge.
In consideration that; 1) the proposed work re-constructs previously existing features; 2) makes
permanent repairs of the emergency repairs performed during the flood event of spring 1995; 3) provides
preventative measures to damaged areas and areas likely to be damaged; 4) is in conformance with the
previously approved Rio Grande Park Master plan; and 5) will improve the flow capacity of the water
channel and remove obstructions, the applicant is permitted to perform limited work in a water course.
The applicant shall fulfill requirements 2, 4, 5, 6, 7, 9, 11, and 12 listed in this response memorandum in
full.
In lieu of requirements 1, 3 anal 8, the applicant shall provide three (3) cross sections of the work area
prior to and at completion of the work (one each, at the work area 6, and 100 yd upstream and
downstream of the work); a color photograph series of all the work areas before and after the work; and
1 OF 5
DRC M Sa96.DOC
.
Memo-Rio Grande Park Stream Margi iew Exemption •
unidentified utilities are uncovered during the work, these shall be reported to the respective utility, and
the location, depth and type of each shall be recorded and presented to the respective utility and the
Aspen/Pitkin County Data Processing Dept. Erosion and sediment transport control will be provided for
the duration of the project. No soils report will be required since the soil mass immediately behind the
rip-rapped wall is native fill material which will be partially replaced and re-compacted in this project.
The conditions of requirement 10 have already been or are being addressed concurrently with this
application. In a personal conversation with Mrs. Moore (on site, April 22, 1996) and a telephone
conversation with Gary Moore, (April 23, 1996), each explained their (The Moore's) stream margin
review/river bank stabilization inquiries with the Army Corps of Engineers, CDOW, CWCB, and the City
of Aspen, their frustration with the process and their decision to not pursue any work on the north bank of
the river (on their property) at this time. Both Mr. and Mrs. Moore knew of the Planning & Zoning
meeting of April 23, 1996 regarding this application and said they would keep informed of the progress of
this permit application.
The Aspen Consolidated Sanitation District (ACSD) has filed a separate Stream Margin application for
its proposed work in the river upstream of the work proposed in this application. At present it is not clear
whether the District will be prepared to proceed with its proposed work this spring in time to coordinate
activities with the Parks Dept. Therefore it suffices to the Engineering Dept. that the Parks Dept. and the
District each know of the other's proposed scope of work and location and will coordinate scheduling and
work activities as possible.
1. Topographic Improvement Plat Survey & Flood Elevations: Prior to issuance of the
construction permit, the developer of this project shall show mean edge of water, mean edge of high water
and flood elevations (mean sea level; provide the name of the datum used) on a topographic plat survey of
the river cross sections where the work is proposed. The surveying will be performed by a land surveyor
currently licensed in Colorado. The survey will include the area of the work, extend 100 yards upstream
and 100 yards downstream of the approximate centerline (transverse to the river flowline) of the proposed
work.
Three (3) cross-sections of the river channel must be prepared prior to and after completing the work in
area 6. 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. In areas 1 through 5 the applicant shall provide color photographs of the river
channel prior to and after completing the work.
HEC II analyses depicting the existing and proposed new water course geometries performed by a
currently licensed Colorado civil engineer shall be provided to the Engineering Dept. 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 i
depict the actual water profiles downstream, at, and upstream of the work area(s). 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 OF 5
DRCMSa96.DOC
Memo-Rio Grande Park Stream Margitiew Exemption
•
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(s).
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 copy of the soils report performed by a Colorado licensed geotechnical engineer
must be submitted to the City Engineering Dept. prior to issuance of the construction permit if site
drainage patterns change.
4. Pedestrian Path Area: The applicant shall be required to restore the Rio Grande Trail to
its present condition, or better, before October 1, 1996. The trail cross-section shall be approved in
writing by the Parks Director prior to issuance of the construction permit. The pedestrian trail space shall
be shown on the final improvement plan.
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 phased, with the first phase to
occur in May, 1996, prior to the annual snowmelt and high water, provision shall be made to ensure that
the work areas and adjacent areas are fully stabilized and protected against normal high water levels
which may occur during the spring run-off to 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 ito 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.
3 OF 5
DRCMSa96.DOC
Memo-Rio Grande Park Stream Margificw Exemption S
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.
8. Surveying Standards: The Topographic Improvement Plat Survey needs to have the
following items corrected or shown prior to issuance of the construction permit:
A. Complete a Topographic Improvement Plat Survey as outlined in section 1 above. The
topographic improvement plat must be properly titled as such; signed in the Surveyor's certificate which
evidences supervision of the survey; and stamped by a surveyor currently licensed in Colorado.
B. Clearly and completely identify the type of survey monuments found and set by type and
recorded identifier, (i.e. "PLS #####" or "LS #####") along with defining distances and bearings, both
record and field measured.
C. Provide the existing benchmark information including location, elevation, benchmark
description and location to the City Engineering Dept. before completion of the project.
9. 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.
10. Adjacent and Opposing River Bank Impacts: The applicant shall inform the property
owners of the adjacent and opposing river banks, upstream and downstream of the intended work for the
purpose of coordinating bank stabilization work and minimizing adverse impacts. As possible, river bed
and bank stabilization and restoration work shall be coordinated between adjacent properties to minimize
disturbance in the water course, reduce the number and frequency of water course work activities, and
minimize conflicting results.
Work which adversely impacts adjacent property owners will not be permitted without mitigating
measures.
Specifically, provide copies of correspondence with the Moore family and Aspen Consolidated Sanitation
District documenting the coordination efforts for this proposed work.
4 OF 5
DRCMSa96.DOC
• Memo-Rio Grande Park Stream MargirtlOew Exemption •
11. Rip-Rapping: 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. The loose pieces of concrete slag left from the former concrete plant and
lying immediately in the work area(s) shall be removed from the site or covered with natural rock to
improve the aesthetic appearance of the project area.
Spherical boulders may be used in areas 1 through 5 individually and in clusters to create pockets, back-
waters and other water features where structural integrity is not the controlling consideration for
placement of the boulders.
12. Embankment Slopes: To the extent feasible, the re-built stone embankment shall be
constructed with a slope not exceeding 1V : 1H and preferably a slope of 1 V : 2H or flatter, or in a
terraced configuration, and/or with vegetation pockets for riparian landscaping. The existing emergency
rip-rapped embankment has a slope greater than 1V : 1H for the portion above the mean high water line
which is the portion of the embankment intended for re-construction.
5 OF 5
DRCMS a96.DOC
�sT Op •
4�C �� DEPARTMENT OF THE ARMY
// \'�� U.S.ARMY ENGINEER DISTRICT,SACRAMENTO
A n M CORPS OF ENGINEERS.
III�.. 1325 J STREET
r �p,`P REPLY TO SACRAMENTO,CALIFORNIA 95814-2922
Sreres°� ATTENTION OF
November 21, 1995
Regulatory Branch (199475278 & 199200308)
Mr. George Robinson
City of Aspen
130 S. Galena Street
Aspen, Colorado 81611
Dear Mr. Robinson:
We are responding to your request for authorization for the
repairs to the Rio Grande Trail embankment along the Roaring Fork
River just upstream of the kayak course inlet. The river bank
eroded away at high water this year removing portions of the
trail and creating a significant safety hazard for the public.
You contacted this office by telephone and we approved the repair
of the river bank to maintain the trail. The project is located
along the Roaring Fork River in the City of Aspen, Pitkin County,
Colorado. .
On August 19 , 1995, Mr. Michael Claffey met with you, your
staff and Mr. Alan Czenkusch of the Colorado Division of Wildlife
to review the emergency repair work at the Rio Grande trail. The
work involved the discharge of less than one cubic yard of
material per running foot of bankline below ordinary high water..
As such, the repair work is authorized by Department of the Army
nationwide permit number 13 for bank stabilization. However,
when viewed from the opposite side of the river, Mr. Claffey
agreed with the group that the rock work appears unstable due to
the amount of voids between rocks and the use of rounded rock in
some locations. Due to the safety considerations involved with
the use of the trail, you are directed to rework the rock to
create a more stable bank. In addition, you must remove some of
the soil placed on the top of the bank or stabilize this soil to
prevent the release of sediment into the river. The reworking of
the rock below ordinary high water is authorized by nationwide
permit number 13 and additional approval from this office is not
required.
. 411
The group also reviewed the erosion to the entrance to the
inlet of the kayak course and the river bank at the midpoint of
the course. You are authorized to repair the erosion at the
course as part of the maintenance required under the Department
of the Army permit issued for the course (199200308) . You should
submit a set of drawings, on how this work will be accomplished.
During the same site visit, the group reviewed the Oklahoma
Flats pedestrian bridge upstream of the repaired river bank. Mr.
Claffey agrees that the bridge does not have sufficient freeboard
above the high water elevation and presents a safety problem for
trail users during high water events. We suggest that the City
raise the bridge elevation to reduce this safety hazard. If the
repair work to the bridge requires the discharge of fill material
below ordinary high water for construction or temporary access, a
Department of the Army permit will be required. There are
several nationwide permits available for this type of work.
If you have any questions, please write to Mr. Michael Claffey at
the address below or contact him by telephone at (970) 243-1199 .
Sincerely,
Gr dy McNure
pi Chief Northwestern Colorado
Regulatory Office
402 Rood Avenue, Room 142
Grand Junction, Colorado 81501-2563
Copies Furnished:
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, 453 Mountain
Laurel, Aspen, Colorado 81611
2 .
• •
ASPEN/PITKIN
COMMUNITY DEVELOPMENT DEPARTMENT
130 South Galena Street
Aspen, Colorado 81611
Phone(970) 920-5090 FAX(970) 920-5439
MEMORANDUM
TO: City Engineer
FROM: Suzanne Wolff, Planner
RE: Rio Grande Park Stream Margin Exemption
Parcel ID No. 2737-073-06-851
DATE: April 5, 1996
Attached for your review and comments is an application submitted by City of Aspen Parks
Department.
Please return your comments to me no later than April 19, 1996.
Thank you.