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Project Name: Stephens Park Stream Bank PEC Number: PEC100034
Project Description:
STEPHEN'S PARK STREAM BANK STABLiZATION AND RE-VEGETATION
Participants:
OWNER TOWN OF VAIL 07/06/2010 �
C/0 FINANCE DEPT
75 S FRONTAGE RD
VAIL
CO 81657
APPLICANT TOWN OF VAIL 07/06/2010 Phone: 970-477-3455
KRISTEN BERTUGLIA
75 SOUTH FRONTAGE ROAD
VAIL
CO 81657
Project Address: 2450 S FRONTAGE RD W VAIL Location: STEPHEN'S PARK
Legal Description: Lot: 13 Block: Subdivision: VAIL RIDGE
Parcel Number: 2103-142-0000-3
Comments: See conditions
BOARD/STAFF ACTION
Motion By: Viele Action: APPROVED
Second By: Pratt
Vote: 6-0-0 Date of Approval: 07/26/2010
Conditions:
Cond: 8
(PLAN): No changes to these plans may be made without the written consent of Town of
Vail staff and/or the appropriate review committee(s).
Cond: 300
(PLAN): PEC approval shall not be not become valid for 20 days following the date of
approval.
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Planner: Warren Campbell PEC Fee Paid: $400.00 �
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Flood Plain Modification �
Application for Review by the JUL 06 2010
Planning and Environmental Commis i n w�
General Information: A floodplain modification permit is a permit to allow construction f im�ro�i�i �t��d� -
cations to the adopted floodplain. Flood Plain Modifications may be approved by the Administrator, subject to review by
other Town of Vail departments. No habitable structures or improvements shall be allowed to be constructed within the
floodplain. Please see Section 12-21-11-E-2, Floodplain Modification Permit, Vail Town Code for more detailed informa-
tion. Vail Town Code can be found on the Town's website at www.vailgov.com.
Fee: $400
Description ofthe Request: ��'e.nh�nS ��-R�K� .S�"�'�e.c.w► �n1L �fi�h,l�►�fi�iJ �v�d Ve-✓e.o�rr.���
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Physical Address: ���• 11'bh�� (�. `/Q.:� , '� 8�l.�5 �
Parcel Number: a� 0 31�a o00 0 3 (Contact Eagle Co. Assessor at 970-328-8640 for parcel no.)
Properly Owner: �O�.cl�,� oF ✓✓���-
Mailing Address: IC4UN a� VI�'I�- 1�e �►��YV�C.h� DI' (�1v►wwh���-1 l�velol�'✓1fr�
�� S. � h � - V IL C.0 51 Phone: q`1�-- y`l��-3 U�
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Owner's Signature:
Primary Contact/ Owner Representative: 1`Y�i S'�P.N gP✓�+a �6/�ol C, �rV 1'e_ . _ _
Mailing Address: �61� 6� VI�'I� -C�rv�r��n�l�l I�f�C(�IoVI-�� �.f S, "�i�h�aC. � VAIL.C�FC1b j�
Phone: ���-U11-3�-/S� /4'7 v—
E-Mail: I��PV�C��•tS.G�����,o�-(�i^^ Fax:
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For Office Use Only: Cash_ CC: Visa/ MC Last 4 CC # Auth # Check#
Fee Paid: C� � �� Received From:
Meeting Date: � Z�2 � C..� PEC No.: ����)��
Planner: 1.1�.-��.. Project No: -�K�a �U� �3��
Zoning: Land Use: �
Location of the Proposal: Lot: Block: Subdivision:
O1-Jan-10
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THIS ITEM MAY AFFECT YOUR PROPERTY
PUBLIC NOTICE
NOTICE IS HEREBY GIVEN that the Planning and Environmental Commission of the
Town of Vail will hold a public hearing in accordance with section 12-3-6, Vail Town
Code, on July 26, 2010, at 1:00 pm in the Town of Vail Municipal Building, in
consideration of:
Report to the Planning and Environmental Commission of an administrative action
approving a request for a minor amendment to SDD No. 6, Village Inn Plaza, pursuant to
Section 12-9A-10, Amendment Procedures, Vail Town Code, to allow for modifications
to the approved development plans to reduce the side setback and increase common
floor area to facilitate an entry vestibule at the rear entrance, located at 16 Vail Road
(Vail Plaza Hotel)/ Parts of Lots O and M, Block 5D, Vail Village Filing 1, and setting
forth details in regard thereto. (PEC100032)
Applicant: Ferruco Vail Ventures, represented by the Mauriello Planning group, LLC
Planner: Warren Campbell
A request for review of a variance, pursuant to Chapter 12-17, Variances, Vail Town
Code, from Sections 12-6D-6, Setbacks, and 12-6D-9, Site Coverage, Vail Town Code,
to allow for an addition of a garage within the front setback, located at 2712 Kinnikinnick
Court/Lot 10, Block 2, Vail Intermountain Subdivision, and setting forth details in regard
thereto. (PEC100033)
Applicant: Patricia Franke, represented by Mark Donaldson
Planner: Rachel Friede
A request for review of a Floodplain Modification, pursuant to Chapter 14-6, Grading
Standards, Vail Town Code, to allow for grading within the Gore Creek 100-year
floodplain, to stabilize and re-vegetate a portion of the stream bank within Stephens
Park, located at 2470 South Frontage Road West/unplatted (a complete location
description is available at the Town of Vail Department of Community Development),
� and setting forth details in regard thereto. (PEC100034)
$� Applicant: Town of Vail, represented by Kristen Bertuglia and Gregg Barrie
„f� n� Planner: Warren Campbell
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The applications and information about the proposals are available for public inspection
during office hours at the Town of Vail Community Development Department, 75 South
Frontage Road. The public is invited to attend project orientation and the site visits that
precede the public hearing in the Town of Vail Community Development Department.
Please call 970-479-2138 for additional information.
Sign language interpretation is available upon request, with 24-hour notification. Please
call 970-479-2356, Telephone for the Hearing Impaired, for information.
Published July 9, 2010, in the Vail Daily.
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MEMORANDUM a�� �"a'I'f
�o�'c � 6- 0' � �
TO: Planning and Environmental Commission �
FROM: Community Development Department
DATE: July 26, 2010
SUBJECT: A request for review of a Floodplain Modification, pursuant to Chapter 14-6,
Grading Standards, Vail Town Code, to allow for grading within the Gore Creek �
100-year floodplain, to stabilize and re-vegetate a portion of the stream bank
within Stephens Park, located at 2470 South Frontage Road West/unplatted (a
complete location description is available at the Town of Vail Department of `
Community Development), and setting forth details in regard thereto. ��
(PEC100034)
Applicant: Town of Vail, represented by Kristen Bertuglia and Gregg Barrie
Planner: Warren Campbell
I. SUMMARY ��'
The applicant, The Town of Vail, represented by Kristen Bertuglia and Gregg Barrie, are
requesting review of a flood plain modification pursuant to Chapter 14-6, Grading
Standards, Vail Town Code. The Town is requesting to perform work and construct
improvement in the Gore Creek adjacent to the eastern boarder with Stephens Park.
The proposed work is the result of erosion to the bank of the creek created by the
numerous users of the park accessing the water in this location. The proposed
improvements to the bank of the creek include grading, armoring (placement of
boulders), revegetation, installation of natural stone steps, a ramp for those who cannot
utilize the stairs, and improvements within the channel of the creek to redirect the forces
of the water, and create better fish habitat. All of the proposed improvements result in a
bank which should be able to withstand the forces of the water, allow for recreational
access, and result in better fish habitat all without affecting the limits of the delineated
flood plain.
Based upon Staff's review of the criteria outlined in Section V of this memorandum and
the evidence and testimony presented, the Community Development Department
recommends approval of this application, subject to the findings noted in Section VI of
this memorandum.
II. DESCRIPTION OF THE REQUEST
The Town of Vail adopted Environmental Sustainability Strategic Plan Goal 3 states that
the Town of Vail shall "ensure that the natural environment, specifically air and water
quality, water quantity, land use and habitat are maintained to current or improved levels
of biological health." To that end, the purpose of the Stephens Park Stream Bank
Restoration Demonstration Project is to implement stream bank stabilization and re-
vegetation at the east end of Stephens Park designed to mitigate erosion,
sedimentation, and degraded vegetation. Restoring this site will prevent further damage
to the riparian area, improve water quality and habitat. Accessibility and recreational
opportunities will be greatly enhanced. The current condition of the site has an eroding
bank approximately 100 feet long that has been exacerbated by recreational use such
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as dogs playing and whitewater/fishing access, and most recently, flooding, which has
resulted in high levels of sedimentation, exposed utilities, habitat loss and reduced water
quality.
Improvements included within the scope of the project include re-grading the stream
bank, which do not alter the flood plain, riparian improvements, re-vegetation, access
improvements including rock work, pathway improvements, and a ramp for accessibility,
and turf and irrigation repair.
The parking and park area may need to temporarily partially closed for the construction
staging area for part or all of the 30 days required to complete the project between Sept
1 and Sept 30, 2010.
A vicinity map (Attachment A), the proposed plans entitled Stephen's Park Bank
Stabilization dated June 29, 2010 (Attachment B), and a letter from River Restorations
dated July 12, 2010, (Attachment C) are attached for reference.
III. BACKGROUND �
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Stephens Park has high multiple recreation use including an off leash dog park, Frisbee
golf, whitewater access, fishing, and picnic area. The Park is located on a floodplain
terrace at the right of the channel. The right bank of the park has eroded approximately
100 feet in length. This erosion was likely initiated from excessive bank trampling
coupled with loss of riparian vegetation at the creek access. There are few large trees
and the bank does not have significant root mass on the floodplain bench in this area.
Creek processes, especially during flooding in June, have exacerbated the erosion.
In the spring of 2009, the Town of Vail environmental team was approached by several
local anglers who were concerned with the impact of development, use, and road
clearing operations on the health of Gore Creek and the ecosystem. Staff convened a
small committee of concerned citizens, interviewed them, and walked the entire length of
the Creek documenting risks, needs, and opportunities for improvement. With this
information, staff submitted a grant to Colorado Water Conservation Board's (CWCB)
Healthy Rivers Fund for $30,000 to address among other stormwater needs, for this
project.
The CWCB recognized the value of the stream bank stabilization opportunities at
Stephens Park as well as the visibility and recognition for the Healthy Rivers Fund in
Vail, and awarded the Town a $6,000 matching grant toward riparian improvements at
this site.
Town Public Works and Community Development have retained the services of River
Restoration to conduct the site assessment and design alternatives. To date, the
following tasks have been completed:
• Task 1: Site Assessment and Survev were conducted on November 10, 2009, which
included topographic and hydrographic survey of the channel and banks. These data
were used to develop the AutoCad base map and the channel profile for the
hydraulic model.
• Task 2: Hvdraulic Modelinq was developed to analyze potential improvements within
the floodway.
• Task 3: Stakeholder Review: the Department of Wildlife conducted a site visit to
confirm the appropriateness of the project for fish habitat and the dates in which the
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project may be conducted (Sept 1-Oct 1). AXS Vail was also consulted to advise on
incorporating accessibility aspects into the project.
• Task 3: Final Design and Cost Estimates, have been prepared. (Attachment A)
• Task 5:Armv Corps of Enqineers 33 CFR 325 qeneral permit has been submitted for
approval.
In addition to habitat and stream bank restoration, recreational opportunities and an
enhancement of a well utilized park, this project provides an excellent opportunity for
demonstration of environmental stewardship in Vail. Vail will once again be hosting the
Colorado Watershed Assembly's (CWA) Annual Watershed Conference at the Vail
Cascade this October. In 2009, this 3-day event brought over 500 people to Vail from atl
over the country. This year, due to participant feedback and the outstanding venue, the
group is returning to Vail. Last year the Town hosted an environmental education tour to
the Black Gore Creek Basin of Last Resort on Hwy I-70, and a tree planting event on the
Vail Golf Course. This year, event organizers have requested that an expert from the
Natural Resources Conservation Service (NRCS) provide a willow planting workshop at
Stephens Park and allow volunteers to help with the re-vegetation effort as a part of the
demonstration project. This is a great opportunity for Vail to provide visitors an
environmental education opportunity, and showcase the Town's dedication to the
environment and outstanding park environment, while reducing the costs of landscaping
at the site.
On July 21, 2010, the Design Review Board conceptually reviewed the Stephens Park
stream bank restoration proposal. They were generally supportive of the restoration
proposal, however, they suggested the Town look at reducing the extent of the proposed
stairs and change the concrete ramp to stone with the goal to keep the stream bank as
natural in appearance as was possible while accommodating the users.
IV. APPLICABLE PLANNING DOCUMENTS
Tile 14, Development Standards, Vail Town Code (in part) �
14-6-6: FLOODPLA/N STANDARDS:
All modifications, grading or installation of proposed improvements within the 100-year
floodplain shall be in accordance with section 12-21-11 of this code.
The floodplain line shall be determined by a registered professional land surveyor by
plotting the appropriate elevation of the floodp/ain on a maximum one inch equals twenty
feet(1"= 20') topographic two foot(2) contour map using the adopted town of Vail flood
profiles (the federa/emergency management agency flood insurance study). The
topographic survey shall reveal the method for determining the starting point and the
starting elevation for the floodplain delineation. A site specific study performed by a
professional engineer per FEMA guidelines and approved by the town of Vail and FEMA
may be required.
Title 12, Zoning Regulations, Vail Town Code (in part)
12-21-11: FLOOD HAZARD ZONES:
A. Purpose: To promote public health, safety and general welfare and to minimize public
and private losses due to flood conditions in specific areas by provisions designed to:
1. Protect human life and health;
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2. Minimize expenditure of public money for costly flood control projects;
3. Minimize the need for rescue and relief efforts associated with flooding and
generally undertaken at the expense of the general public; �`
4. Minimize prolonged business interruptions;
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5. Minimize dama e /" �
g to pub�c facilities and util�t�es such as water and gas mams, �,
electric, te/ephone and sewer lines, streets and bridges located in floodplains; �
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6. He/p maintain a stab/e tax base by providing for the sound use and development �;
of flood prone areas in such a manner as to minimize future flood blight areas; �_:
7. Ensure that potential buyers are notified that property is in a flood area; �
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8. Ensure that those who occupy the floodp/ain assume the responsibility for their �
actions; �'
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9. Protect the natural areas required to convey flood flows and retain flow
characteristics; and �
10. Obtain and maintain the benefits to the community of participating in the national �;
flood insurance program. �`
8. Basis For Establishin The Areas Of S ecial Flood Hazard: The areas of s ecial flood �'
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hazard identified by the federal emergency management agency in a scientific and �`
engineering report entitled, "The Flood Insurance Study For Eagle County, Colorado, �
And Incorporated Areas" dated December 4, 2007, with accompanying flood insurance
rate maps and flood boundary-floodway maps (FIRM and FBFM) and any revisions
thereto are hereby adopted by reference and declared to be a part of this chapter. '
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C. Designation Of The Floodplain Administrator. The town engineer or designee is �`
hereby appointed the floodplain administrator to administer and implement the
provisions of this chapter and other appropriate sections of 44 CFR (national flood
insurance program regu/ations)pertaining to floodplain management.
D. Duties And Responsibilities Of The Floodplain Administrator.� Duties and
responsibilities of the floodplain administrator shall include, but not be limited to, the
following:
1. Maintain and hold open for public inspection all records pertaining to the
provisions of this chapter.
2. Review all permit applications to ensure that the requirements of this chapter have
been satisfied and that the proposed improvement will be reasonably safe from
flooding.
3. Review, approve or deny floodplain use and modification permits to determine
whether proposed improvements meet the provisions of this chapter. �.
4. Review evidence prior to the issuance of a floodplain use permit that all necessary �
permits have been obtained from those federal, state, or local government agencies �'
from which prior approval is required. Conditional floodplain use permits may be
issued contingent upon receipt of the above mentioned agency permits.
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5. Review and verify that no new habitable structure is constructed within the flood
hazard zone.
6. Review and verify that a licensed professional engineer or professional land
surveyor certified the location of the 100-year floodplain on all development �
applications that are adjacent to, or partially located within the 100-year floodplain,
that are proposing improvements that may affect the floodplain.
7. Where interpretation is needed as to the exact location of the boundaries of the �
areas of specia/ flood hazards (for examp/e, where there appears to be a conflict
between a mapped boundary and actual field conditions) the floodplain administrator
shall make the necessary interpretation.
8. Notify, in riverine situations, adjacent communities and the Colorado division of
emergency management, prior to any alteration or relocation of a watercourse, and
submit evidence of such notification to the federal emergency management agency.
9. Assure that the flood carrying capacity within any altered or relocated portion of
any watercourse is maintained.
10. When base flood elevation data have not been provided in accordance with �
subsection 8 of this section, the floodplain administrator shall obtain, review and �'
reasonably utilize any base flood e/evation data and floodway data availab/e from
federal, state or other source, in order to administer the provisions of subsection F of
this section.
11. When a regulatory floodway has not been designated, the floodplain
administrator must require that no new construction, substantial improvements, or
other development (including fill) shall be permitted within zones A1-30 and AE on
the community's FIRM, unless it is demonstrated that the cumulative effect of the
proposed development, when combined with all other existing and anticipated
development, will not increase the water surface elevation of the base flood more
than one foot (1') at any point within the community.
12. Under the provisions of 44 CFR chapter 1, section 65.12, of the national flood
insurance program regulations, a community may approve certain development in
zones A1-30, AE, AH, on the community's F/RM which increases the water surface
elevation of the base flood by more than one foot (1), provided that the community
first applies for a conditional FIRM revision through FEMA (conditional letter of map �'
revision).
E. Floodplain Permits:
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1. Floodplain Use Permit:
a. Purpose: The floodplain use permit is a permit to allow temporary grading �
within the floodplain and allow for necessary public infrastructure improvements
within the floodplain. A floodplain use permit may be issued under at least one of �'
the following conditions:
1 Tem ora r i ���
O p ry g ad ng m the floodplam approved by the floodpla�n �
administrator, in which the site is returned to its existing grade and conditions;
(2) Utility construction/maintenance within the floodplain approved by the
floodplain administrator which is deemed to have an insignificant impact to
the 100-year floodplain;
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(3) Stream bank stabilization within the floodplain approved by the floodplain �
administrator and is deemed to have an insignificant impact to the floodplain;
(4) Public infrastructure construction/maintenance approved by the floodp/ain
administrator including, but not limited to, roads, bridges, recreation paths,
walks, stream drop structures, and stream erosion control measures which
are deemed to have an insignificant impact to the floodplain;
b. Floodplain Use Permit Application Submittal Requirements: Applicants shall
provide the following information prior to design review or any review by the
planning and environmental commission:
(1) Site plan at an engineering scale showing the location, dimensions, and
elevations of the proposed landscape/grade alterations, existing and
proposed structures, relevant landscapeftopographic features, and the
location of the foregoing in relation to the 100-year floodplain. The floodplain �
line shall be provided on a plan certified by a licensed professional engineer
or land surveyor.
(2) Detailed topographic cross sections provided by a licensed professional
surveyor of the area proposed to be altered, showing existing and proposed
conditions.
(3) Description of the extent to which any floodplain will be altered including
why, when, how, and when it will be replaced back to its original
configuration, and addressing each relevant criterion in subsection E3 of this �'
section.
(4) Copy of all other necessary approved permits (i.e., building permit, public
way permit, ACOE permit, dewatering permit, DOW permit, CDHPE permit,
etc.).
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(5) If required by the floodplain administrator, an engineered floodplain �
analysis of the impacts to the floodplain prepared by a qualified licensed
professional engineer.
(6) Submitted application for a conditional FIRM and floodway revision
through FEMA, if applicable.
(7) Any additional information deemed necessary by the floodplain �
administrator.
V. REVIEW CRITERIA
As discussed earlier in this memorandum the applicant initially requested review of a
flood plain modification under the provisions of Chapter 14-6, Grading Standards, Vail
Town Code. After submittal and notification of the request the applicant received
confirmation from River Restoration in a letter dated July 12, 2010, that the "floodway �
and 100 year floodplain delineation lines are not appreciably moved" as a result of the �
proposed improvements. As found in Section 12-21-11(E)(1), Floodplain Permits, Vail
Town Code, the administrator has the ability to administratively approve:
Stream bank stabilization within the floodplain approved by the floodplain
administrator and is deemed to have an insignificant impact to the floodplain.
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As this proposal not only includes stream bank restoration, but additional built �
improvements, the applicant desired to provide a public process for the Planning and
Environmental Commission and the public to provide the opportunity to comment on the
project. While there are no specific criteria for review of a floodplain permit staff has
include the criteria for the review of a floodplain modification request below:
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(1) The effects upon the efficiency or capacity of the floodway; �
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The proposed improvements are designed to take a portion of the force of the water
flow in this stretch and reduce the force of the water on the bank. The creation of the
"eddy" will result in sand and sediment being deposited on the beach at the base of �
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the proposed stairs. There will be no impact to the efficiency or capacity of the �
floodway. �
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(2) The effects upon persons and personal property upstream, downstream and in �
the immediate vicinity;
The letter from River Restoration identifies that there are minimal increases in the �;
backwater effect caused by the improvements, however, they backwater effect �
"remains below the interpolated values" and the increase in "water surface elevation
is absorbed in the steep channelized section" of Gore Creek just upstream from the
site. Staff does not belive there is any negative impact to personal property in the
vicinity of the proposed improvements.
(3) The effects upon the 100-year flood profile and channel stability;
The letter from River Restoration identifies that the "floodplain delineation lines are
not appreciably moved" as a result of the proposed improvements. �;;
(4) The effects upon any tributaries to the main stream, drainage ditches and any
other drainage facilities or systems; �
The location of the proposed stream bank restoration is not in the vicinity of any
tributaries, drainage ditches, or other drainage facilities and therefore Staff does not
believe there are any negative effects on these elements.
(5) The danger to life and property due to flooding or erosion damage; �
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The letter from River Restoration identifies that the overall elevation will be higher in
this location as a result of the proposed improvements the "flood waters will remain
in the Effective floodway" and "not overtop the existing river banks". Because of this
finding staff does not believe there will be any danger to life and property caused by
flooding or erosion damage. �
(6) The susceptibility of the proposed improvement and its contents to flood damage
and the effect of such damage on the individual owner;
The proposed improvements have atl been designed in order to withstand the forces
of the water in this section of Gore Creek. The goal is to install the materials in a
manner which will withstand flood waters and the associated damage that could �
occur.
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(7) The danger that materials may be swept onto other lands to the injury of others; �
As stated above the materials are intended to be installed to withstand the forces of
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Gore Creek and resist being swept away from the point of installation. �
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(8) The compatibility of the proposed use with existing and anticipated development;
Stephens Park is a highly utilized park within the Town of Vail. The proposed
improvements have been designed to be compatible with the desired intent the users
of the park have exhibited and expressed, which is access to the Gore Creek. Staff
believes the proposed improvements are compatible with the existing and anticipated
development.
(9) The safety of access to the property in times of flood for ordinary and emergency
vehicles;
The proposed improvements do not negatively affect the current level of access for
emergency vehicles to the site.
(10) The costs of providing governmental services during and after flood conditions
including maintenance and repair of streets and bridges, and public utilities and
facilities such as sewer, gas, electrical and water systems;
The proposed improvements are intended to mitigate the erosion and degradation of
the stream bank in this section of Gore Creek and eliminate the need for future
governmental services and improvements in the future.
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(11) The expected heights, velocity, duration, rate of rise and sediment transport of
the floodwaters and the effects of wave action, if applicable, expected at the site;
The letter from river Restoration describes the proposed improvements as having no �
appreciable adverse impacts as the result of increased velocity or floodwater
elevation at this site. Staff believes this application complies with this criterion.
(12) The effect the proposed changes will have any adverse environmental effect on
the watercourse including, without limitation, erosion of stream banks and stream
side trees and vegetation and wildlife habitat;
The sole purpose of the proposed improvements is to protect the stream bank and
restore vegetation along this stretch while providing access to the Gore Creek for the
park users. Staff believes the application complies with this criterion.
(13) The necessity to the facility of a waterfront location, where applicable;
The proposed improvements are located in the location depicted as users of the park
gain access to the Gore Creek at that location. The provision of steps and a ramp
are necessary to be located in the proposed location to provide access to the Gore
Creek for the park users.
(14) The availability of alternative locations, not subject to flooding or erosion
damage, for the proposed use;
This criterion is not applicable.
(15) The relationship of the proposed use to the comprehensive plan for that area.
As stated previously in this memorandum stream bank restoration is a
recommendation of the adopted Environmental Sustainability Strategic Plan Goal 3.
Staff betieves the proposal complies with this criterion.
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VI. STAFF RECOMMENDATION
The Community Development Department recommends approval, of a Floodplain
Permit, pursuant to Chapter 14-6, Grading Standards, Vail Town Code, to allow for
grading within the Gore Creek 100-year floodplain, to stabilize and re-vegetate a portion
of the stream bank within Stephens Park, located at 2470 South Frontage Road
WesUunplatted (a complete location description is available at the Town of Vail
Department of Community Development), and setting forth details in regard thereto.
This recommendation is based upon the review of the criteria outlined in Section V of
this memorandum and the evidence and testimony presented.
Should the Planning and Environmental Commission choose to approve this Floodpalin
Permit request, the Community Development Department recommends the Commission
pass the following motion: �_;
"The Planning and Environmental Commission approves the Floodplain Permit request �,
pursuant to Chapter 14-6, Grading Standards, Vail Town Code, to allow for gradmg
within the Gore Creek 100-year floodplain, to stabilize and re-vegetate a portion of the
stream bank within Stephens Park, located at 2470 South Frontage Road
West/unplatted (a complete location description is availab/e at the Town of Vail
Department of Community Development), and setting forth details in regard thereto."
Should the Planning and Environmental Commission choose to approve this Floodplain �_
Permit request, the Community Development Department recommends the Commission �`
makes the following findings: �
"Based upon a review of Section V of the Staff's July 26, 2010, memorandum to the �`
Planning and Environmental Commission and the evidence and testimony presented,
the Planning and Environmental Commission finds:
(1) That the proposed use or modification adequately addresses the findings in
subsection E3a of this section, as determined by the floodplain administrator, unless
the applicant can demonstrate that one or more of the standards is not applicable, or
that a practical solution consistent with the public interest has been achieved;
(2) That the proposed use or modification is consistent with the adopted goa/s,
objectives and policies outlined in the Vail comprehensive plan and compatible with �`
the development objectives of the town; and
(3) That the proposed use or modification is compatib/e with and suitable to adjacent
uses and appropriate for the surrounding areas; and
(4) That the proposed use or modification promotes the health, safety, morals, and
genera/ welfare of the town and promotes the coordinated and harmonious
development of the town in a manner that conserves and enhances its natural
environment and its established character as a resort and residential community of
the highest quality.
�
VI. ATTACHMENTS
�'
A. Vicinity Map
B. Stephen's Park Bank Stabilization plans dated June 29, 2010
C. Letter from River Restorations dated July 12, 2010
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� �t�t ' W?UcxJ'E_._.+�le•nerc,ol�pauF�s.C;uloradnSt��i)' i976)<3}�_9�65
JUIy 12, 2010
Mr. Tom Kassmel
Town of Vail
75 S. Frontage Road,
Vail, CO 81657
(970)479-2235
RE: Stephens Park Bank Stabilization, Floodplain Compliance
Dear Tom,
Proposed bank stabilization at Stephens Park includes in-channel modifications to
hydraulics for concentrated access. This letter is to discuss how the proposed
modifications comply with Town of Vail and Federal floodplain development guidelines.
TOV: 12-21-10: DEVELOPMENT RESTRICTED: (E) The Administrator may
require any applicant or person desiring to modify the flood plain by fill,
construction, chanrrelization, grading, or other similar changes, to submit for
review an environmental impact statement in accordance with Chapter 12 of this
Title, to establish that the work will not adve�-sely affect adjacent properties, or
increase the quantiry or velociry offlood waters. (Ord. 16(1983) � 1: Ord.
12(1978) ,¢4)
Existing Conditions
A floodplain model in HEGRAS format was obtained from Town of Vail. Three
geometry profiles were developed; Duplicate Effective, Existing and Proposed
Conditions. The Duplicate Effective is the imported geometry titled "Imported
Geo0lmbjrevised"; which is the most current FEMA flood model for Gore Creek at the
Stephens Park reach. The Existing Conditions model is the Duplicate Effective with the
insertion of seven additional cross sections surveyed by RiverRestoration in the Fall of
2009. The Proposed Conditions model is the Existing Conditions model with cross
sections modified to represent worst case scenario channel changes and analyze
hydraulics of the proposed conditions.
No hydrologic analysis was performed; flood flows were based on the Federal Insurance
Study reported values. The 100year discharge is 2620cfs through the Project reach. This
flow was likley exceeded on June 6, 2010 and water surface elevations crested 7854.5
feet elevation near river station 11+00. Additional bank erosion occurred as a result of
this event.
The existing FEMA model does not specifically represent flood conditions at the project
area. FEMA cross sections are located 150 feet upstream or 350 feet downstream of the
1 of 3
Attachment C
c�,.,
�; IvER
,/�=��3± �i►.
g� . •� � •��
- t t J� ' Yi)13ox 0_€_3.+_�Ie�ne�cd�ps inrs t�olmad;i 5 t JZ,i 9?;t?t �i>6S
proposed work. The discrepancy between the Duplicate Effective and Existing
conditions model is the resolution of channel geometry of the reach. The geometry in the
FEMA model is based from aerial and ground topography over long distances. The
geometry in the Existing conditions model is based from site-specific channel geometry
surveyed by RiverRestoration Fa112009. The Existing conditions model shows greater
detail of channel geometry and a more accurate representation of flood flow conveyance.
The Existing conditions base flood elevations are predicted slightly lower than effective
values interpolated between River Station (RS) 1298.6 and 6431.
The Proposed Conditions model increases the backwater effect over existing conditions
but remains below the interpolated values of the effective model. All predicted water
surface elevation changes are absorbed in the steep channelized section upstream of RS
1298.6. The Proposed Conditions do not adversely affect adjacent properties, or increase
the quantity or velocity of flood waters appreciably over effective values published by
FEMA. This is because of the steep banks and steep channel. Zone X, Floodplain and
the Floodway are coincident here. Although Proposed base flood elevations are higher
than Existing conditions, the flood waters will remain within the Effective floodway
delineation and not overtop the existing river banks. The floodway and 100 year
floodplain delineation lines are not appreciably moved. Table 1 compares the Effective
base flood elevation with the Duplicate, Existing and Proposed condition hydraulic
models.
Please contact me with any questions or comments.
Sincerely,
tz��
� ��,
Jason Carey P.E.
River Engineer
iason.carev(c�riverrestoration.org
(970) 947-9568
cc. Gregg Barrie, Kristen Bertuglia
2 of 3
� IVER
,,r�,f-(�� �,►: ,. , ..
� �1 t/� pi)[l�-x:J2€"_'3 iileuw oad�pa€�tgs.t olerad;.�fi L»U i 4'i.}9,t7_y�f S
Table 1 Base Flood Elevations for Stephens Park Reach (2620cfs) 07/12/10
River Station Effecti�e Duplicate Existing Change Altemati�e 2 Chan e
2126.81 7877.7 7877.83 7877.83 7877.83 0
1832.98 7872.04 7872.04 7872.04 0
1314 7858.99 7858.99 0
1298.7 7859.1 7858.99 7858.81 -0.1 7858.8 -0.01
1251 7858.23 7856.97 -1.2 7856.98 0.01
1172.5 7856.99 7855.43 -1.5 7855.43 0
1140 7856.47 7854.64 -1.8 7854.79 0.15
1100 7855.83 7854.41 -1.4 7854.94 0.53
1043 7854.93 7853.99 -0.9 7854.13 0.14
800 7851.07 7851.21 0.1 7851.21 0
643.1 7848.58 7848.58 7848.58 0
576.1 7847.76 7847.76 7847.76 0
Stephens Park
564.2 Bridge 0
564.1 7846.86 7846.86 7846.86 0
516.5 7845.23 7845.23 7845.23 0
74.1 7840 7838.17 7838.17 7838.17 0
1 7836.14 7836.14 7836.14 0
Kinnickinnick
-1 Bridge 0
-30 7835.92 7835.92 7835.92 0
-84.8 7836.35 7836.35 7836.35 0
-247.3 7834.72 7834.72 7834.72 0
INTERPOLATED VALUES
3 of 3
�� � � ' Generol Notes _
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(970)-479-2337 V�,co
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--..,,` DETAIL)
'���` J
� TYPICA� LAYOUT FOR STREAMS AND RIVERS �, �
ORIENTATION WHEN INSTA��ED TO BE P�ACED DOWNSTREAM OF ANY EQUIPMENT WORKING IN THE WET �
� RIVER Q �
2:1 SIDE SLOPE MAX �_�
ATTACH LINES SHORE�INE � t—„ U
TO SHACKLE
`_\p� SI�T FENCE AT TOE OF SIDE � RAPID �-��
u� � ' �:-�` SLOPE (SEE DETAIL) _ ANCHOR PTS. P00� � �
�i�i;�i j� �m..� WATER SURFACE 2 2 QCURTAIN ANCNOR (AS � O
�.,,;i; , ° _
�� INSTA�L.STRAW Bn�ES AT TOE oF �RECOMMENDED 8Y OIL BOOMS �
ACCESS RAMP WHEN NOT IN USE � `�� �\ \\ � O•� � THE MANUFACTURER) f � �
"!'�I!II� :'i:�t ` (SEE APWA P�AN 121) �/�l/�- �/�/i�/��j�///�/ //
':-<K:.
� .�\i>�' �.�
MIN. 12' RAPID � �
TEMPORARY EQUIPMENT ACCESS (TYPICAL) �]
RI VERBED
"�s D1J !� ,�,� �, �T01��nB00M°�TYPICA�� 4 �('� '�'�
b`a' ' � ����� PLA`N VIEW�"= NTS o7 V J �
t���a � �
������� �`�r� ����a��
FI�TER FABRIC ����61F�J�3�tl�1�-` �0��<��.:�,+ !�r'�i,'������� �[! � � � �
MATERIAL SECURE�Y
FASTENED TO 1NE APPROXIMATELY 8 TURBIDITY CURTAIN SECTION (TYPICA�) ,; Q � W
POSTS OR IF USED THE INCHES OF FILTER i'"`�=�Fct'r'.�� �ry=��y�'����� ��_,�%p�,,��� ���:� �� I'i; ���� ���� ' h
WIRE MESH FABftIC MATERIAL MUST NTS ��i'J '�� �� �� v
EXTEND INTO A TRENCH „o � U
AND 8E ANCHORED WITH /�
COMPACTED BACKFILL ( , '�� '
MATERIAL -��1 �� �"� � --
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�,u a���o�.__ :.,��_�..��.:.__,_ _,. .�_�v,. _ . r A��o,�� u..1
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�
RUNOFF 1/4 IN. TIE ROPE 5/8 IN. POLYPROPYLENE ROPE s��i �Flt � � `t� �./ (�g �,p�gp� � " � - � ' "� � � O
� � G'�:_ a��5 Js_��to..--, .,_� ..,..,�v.., ., _.. _;.._,:: U,L:1"0dtl6�9��0
-- — —'
_ _ _
�....� �
10 INCHES * FLOATATION -,.
(MIN) FOLDS FOR COMPACT STORAGE _
APPROXIMATE �
, 4—INCH BY (n �
4—INCH TftENCH 1" X 2" STAKE 1 t � /
DEPTH ACCORDWG BINDWG WIRE STAKED AND ENTRENCHED tO � � �
TO NEED OR TWINE
ATTACHING TWO SILT FENCES �-1�4 IN. CHAIN 50 LB (APPROX.) STRAW BALE
FILTERED COMPACTED SOII. TO
8 OZ NON—WOVEN FILTER FABRIC � RUNOFF �( ,�( PREVENT PIPING � � �
,�� �(� _ SEDIMENT LADEN =
(BLOW—UP OF SHACK�E CONNECTION) ( '( ,,,,,,,,;,,;;,': RUNOFF � n � I
—II—o �--�� '\�/\� � a ��� y, t.L_ �
PLACE THE END POST `�/�/��/�i�%j,� �\���/�����/ W W
—��OF THE SECOND � '..� � O
FENCE INSIDE THE ENO SI�TMASTER II PROPERLY INSTALLED S1RAW O
PoST oF THE FIRST DREDGE BARRIER NON-WOVEN DBNW eALE (CROSS-SECi1oN) '-- � � �
FENCE BY PARKERSYS7EMS OR EQUIVA�ENT
ROTATE BOTH POSTS AT APPROVED FOR
�,I�LEAST 180 DEGREES IN 1. EXCAVATE THE TRENCH 2. PLACE AND STAKE STRAW BALES CONSTRUCTION
A CLOCKWISE DIRECTION ANGLE FIRST STAKE
TO CREATE A 71GHT .�� TOWARD PREVIOUS�Y
DIRECl10N OF RUNOFF WATERS SEAL WITH THE FABRIC TU R B I D I TY C U R TAI N (TYP I C A L� �/�-�'�� � � LAID BALE
� I MATERIA� NTS ' " � �
_� � / / WEDGE LOOSE STRAW
\`�`� !BETWEEN BALES
� �`'`�DRIVE BOTH POSTS �LO�„ � No. Revision/Issue Date
ABOUT 10 INCHES TYPICA� LAYOUTS
. �
INTO THE GROUNO «m�^m ^^^�^•^ "
AND eURY FLAP STREAMS, PON�S, AND LAKES (PROTECTED AND NON-TIOA�) �� �,
BALES MUST BE TIGHTLY �I V E R
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ENCE POSTS `��. ..�.....�. Po..Bbz..2123 .......... ��_..�..
� 6 �N CENTeR FILTER FABRIC � STAKE OR ANCHOR �e,� 6lenwood 5pnngs,Co b I s02
� (4 oZ. NoN-WOVEN) SHORE�INE EVERY 10' (TYPICAL) \� l
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� �FI�L AREA
C'ONSTRUCTION / * THIS DISTANCE IS VARIABLE
Pmjeel tleme on0 AOOrcea
SHORELINE TOWN OF VAIL
TOE TREN H_���� /� TRUBIDITY
�"`"�"""�" � ANCHOR�T. GORE CREEK
CURTAIN
FLOW `"�"'-
BACKFIL� TRENCH
FOR ADDITIONAL STRENGTH STRAW BALE (TYPICAL�
FILTER FABRIC MATERIAL CAN 5
BE ATTACHED TO A 6-INCH (MAX)
NTS ��
MESH WIRE SCREEN WHICH HAS r,o;�c sn�e�
BEEN FASTENED TO THE POSTS STEPIIENS
SI�T FENCE (TYPICAL� �07-30-2010 �— �
NTS � �e�� NTS
�� TURBIDITY CURTAIN (TYPICAL) 3
NTS ��
Generoi Nales
Notes�
1. Contrnctor Shatl Use Att Nai:ural 100% Biodegradable �Approxir�ately �
Erosian Control Blankets, Type 7, Type Z, Type 3. 200 Staptes Per �
8.0' Roll. g Q.
2, Stake Blnnket In Place, Cut Hotes Through The �
�ayers, Then Dig The Ptanting Holes In The SoiL Staple Drawings Not To � �� � �
Around Plnnt Every 1'. Scale 2.0' 2.0' 2.0' 2.0' �
3. Erosion Controt hinterial Must Be Ptnced Loosety ❑ver 8.0' Wide Z'S (�)
G�^ow�d Surface. Do Not Stretch. Blnnket Shown ' �
4. Excnvate A 6' Wide Sy 6' Deep Trench Atong The Top x X x � J �
�f The Stope. The Trench Shalt Run Along The Length ❑f �•5� � �
The Instaltation. Staple Btanket Atong Bottoro ❑f Trench,
Fitl With Cor�pacted Soil, ❑vertap Blanket Towards Toe ❑f " " " � W
Slope, And Secure With Staptes Eve�^y Z'. . /
Figure E � �!
�������Y�� 1����� X x X � �
SHIPLAP IN ,;`;;`.`�; Figure C
� ����I� D�WNSTREAM i�`."::'r.-.' � �
� DIRECTIDN ,-:r:,i.:'l;",.y x
��tl� I!"'ll�� 1�1���� � � "�
"' tanket 4 � ( � 1
� s`�j� lv . � �"('� O
� � a • Denotes Staple locntion
° Figure D- Plan Vlew V J n/
0C9��o �� Figure F � � 1�
� - �-.---^-°--�....___.��_-, `--
WILL�W STAKES Ground Surface " "' Btanket � � � �
❑R VEG PER � �
PLANS 8.0' n � O
�,� , � - ,4 i�� „�` 1.0'-�-1,O�1A�1.0'-�1.0�-1.0=�-lA'-�1.0' ��
F s': i a. J' �._ � � � 9 F�� ti� Figure B/
_ ... . . _ . _�..
:;:,;...
> � � U
, ,yz _, �:..r. - � �s ���':"-CC:," Figure E Denotes Stapte Locntion _
� ' ( .,..... � .,�, ...,,�� " �
: y��3t� ��d�' +��u��'��t--.:, � �' .....� Figure E— Ptan View � �
ii" �u�a3�r�tl�'��� �1����'� �� Htnnket 3 O � �
��p, a `�'��.r��!1l9o-3����i���bG���3���. �'�;,f�� �fl � n g re D _
F� U W � O
I n,.:;jut�Gv � � Hla ket i =
_.,s , � \� — 6.0" 6.0' � � J t(1
V )
_ /"� � � ��� F(gure E yiC � iC `C �C �C � �C � �C � W W O
��r�`�r �C��° � l�J L � ( � 1'XI'X24" HARDWO�D STAKES 12.0' 6,0" � �-- � �
°s�` -"'- "-�-""— - ' "`'"��"J'��r���� \j , THR�UGH ALL LAYERS OF \✓RAP �('� n
�'/� L I C16` ❑.CJ 6.0' � V ) LL. �
� � firr x, V 24" WRAP WITH SOIL
� � �G�t.�:��oc ::�-,,�,.� �T �_.— :-� _ — _ APPROVED FOR
❑VERLAY FILTER FAHRIC i i �15,� Figure F- Profite View Figure E
FROM BAI�K STRUCTURE 1.5• CONSTRUCTION
❑ULDER WALL ❑R ❑THER
RIVER BANK STRUCTURE
- Critical Point
. No. Revision/ISSUe Date
� Hlanket 1 �
F��
3oM rd;�'N wa;�e. ............ ... ._........
_ 3.0' ?.,
Blnnket 3 _ Htnnket s Btanket i Terminal End Criticnl Point �y �� � - �j V E R
_ ,-�
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Ground Surface
Pmject Nome oM Mdren
Figure B- Profile View Figure C- Cross Section View
Flgure G- Critical Point Securing
TOWN OF VAIL
GORE CREEK
1
EROSION CONTRO� B�A�IKET (ECB) INSTAL�ATION ��
NTS etojG1 STEPf1ENS ��"`
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General Notes
200 CFS WA7ER SURFACE �
NOTE:STAKES SHOULD BE PLACED RANDOMLYAT O
A RATE OF 2 HOLES PER SQUARE YARD.INSTALL 3
LIVE STAKES(WHERE POSSIBLE)PER HOLE. �
2'LiF1'OF MUtCH;HOID BACK 61NCHES FROM TRUNK �
STAKES TO BE PIACED INTO GROUND
PERPENDICULAR TO 7HE SLOPE IN A � i.SEE SPECtFICATiONS �
PREDRILI.ED PILOT HOLE
2.Q1ffINGS SHALL BE COLl.ECTID WHILE DORlMM;WHEN
1HE LEAVES HAVE FALLET7,AND NIGtiTTEMPERAIURES ARE EROSION CAN7ROL BLANI�i;X-CUf;'NCK IN SIDE OF J
R1EE�NG. B�B OR CONiAtNER;SEGURE 10'STAPLE i'O.G;
LtGHTLY TAMPER BACIffILL
= 3.COTTONWOOD CUITINGS SHALL BE�'TO 1�°IN FOR B&B: ROPES�THE TOP OF THE 8ALL �
—i I(I I I I I DIAME'IH1,AND 2'hIINIMUM IN LENGiN. SHALL BE CUT. REMOVE TOP 1/3 OF �
BURLAP. REMOVE TOP 1/3 OF BASKET A
E 4.CU1'fINGSHALLBETAI�i'FROM'IHEBASEOFTHES�EMS. ALLTWINE. FORCONTAINER:REMOVE
' 150 CFS WATER SURFACE ��t�)I I a1TlHE BOITOMS AT A 45 DEG.ANGLE AND THE TOPS CANTqINER AND LOOSEN ROOTS StSGHTLY �
��` ���j-,� I—II I(—I �T� BY SCRATCHING SIDES OF ROOTHALL �
� = I I I—I I I 5.CllTTINGS SHN1.BE SIRIPP�OF LEADERS,AND lAN6 BEFORE PLANfiNG.
����I((��, f ..-fi` '�-. �~�-y_� 8RAN61ES TO AVOID D(�SS DRYING. CREATE SAUCER W/TOPSOIL(3"MAX.) �
I I I��) —i I�T"'I�- --"-�,•- . —I I I—) � DCCEPT IN DRIP IRRIGA7ED AREAS
'�—. ' I ` �� � �I—)I I FORUPT0�24H URSBffOREPLAMlN6TEt1ANDSNADE � i Y i
I `�)������=(j`i � ,.� �'�;�.r—�% �! � —�—, r�- z
�f-4I!I=I I!�`t�I(�I (�'`-'(I i� � � 5 CFS WATERSURFACE —I I I�) �H ��F i I ��,ii� �
�I(=I I I-=I I 4=I�I=I I i=I I.I= ��'' I—I I I 7.PU1M'7HECUTTINGSWIMTHQRBASESATORNFAR - _ ��� +� �-4 PLAMING DES OFHOLE PRIORTO '� ( (\
THE 200 ff5 WAT6t ELEVATtON. ° ar. 1- � " � \,-�.J O
-i I I=--I I 1=111-1 I I—i I 1—!i i� I =1 I 1=i L� � T����-� N�(�����
��1=I I i—���—���.°��� 8.I 3 G H i L Y P A I N T T H E E%P O S E D C U i S O F 1 H E C�i f O N W00 U �j'i�i��,- r�-�'!�:�=.,�• �.. .�,�-+��!�I�T� DEP'M. IFBOVESRDCCAVATION OCCURS ER �('\ ��
—11�=1 ��1=-���-
UNDISTURBED SUBGRADE ��� _I�I_I ��`�50/50 MD(OF LATIX PAINTAND WAT8iT0 REESfABLISH DESIRED ELEVATION W1TH � �> > �--
/ !�I I�I I I- �U�WA��� ��V-DIA.MIN. 95%COMPAGTED FlLL W �
�—I I(=I 45�EG.ANGLE � � � ,�
1 WI�LOW STAIQNG 2 TREE POLE PLANTING 3 SHRUB PLANTING � (L. � Q
� NTS �—a �°"�� MS .,i' �('� �--
U J Q
Containerized Ripairan Shrubs: � z Z �
pecies ommon ame ize �������� ����� � W � —
1 Po ulus an ustifolia narrowieaf cottonwood 1 �� ������ Z � � .�
1 Salix monticola Rock Mountain willow 1 ������ ��� ����� � W W
1 Salix e eriana Ge ers willow 1 Q I— �./ �
1 Salix drummondiana Drummonds willow 1 ���`����-r-� {— (� lL LL.
1 Salix drummondiana Drummonds willow �j APPROVED FOR
1 Salix lasiandra hi lash willow � ��������°� - � --- -�-� CONS7RUCTION
1 Salix lasiandra hi lash willow 5
3 Salix exigua coyote/streambankJsandbar willow 1 qt No. Revision,�=s�e oo�e
1 Inus incana ss . tenuifolia hinleaf alder 5
- , �,m� .a�;�e,no _
2 Ribes inermiellacustra hitestem ooseber /s in currant 1 �� .�`�� ���` `�� � � �� ` �-�
2 Lonicera involucrata inberry honeysuckle 5 '. `� e x �"'��� �`�=i IvE R
2 Rosa woodsii oods rose 1 `;�' ,� ,'',�" ` ° ' ,��� .�
� �� n4 :r _r•.°
_ P.O:Boz 2123 ._. , __..
'- s . � i i Glenwood Spnngs,CO 81602
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taked Ri arian Shrubs `�e ��� P�,tt"'°�°°"°"°°R„ —
f�ty pecies Common Name ize ' � � � rowN oF vAi�
/ , `�� 60RE CREEK
5 Po ulus an ustifolia narrowleaf cottonwood cuttin >; w
5 Salix monticola Rock Mountain willow cuttin
5 Salix geyeriana Geyers willow cutting
5 Salix drummondiana Drummonds willow cuttin P"'°"STEPIIENS ="`°`
8 Salix exi ua co ote/streambank/sandbar willow cuttin °°07-30-20I O �-�
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NTS