HomeMy WebLinkAboutLand Use Case.1150 River Dr.A081-02
("'<;,
CASE NUMBER
PARCEL In #
CASE NAME
PROJECT ADDRESS
PLANNER
CASE TYPE
OWNER/APPLICANT
REPRESENTATIVE
DATE OF FINAL ACTION
CITY COUNCIL ACTION
PZ ACTION
ADMIN ACTION
BOA ACTION
DATE CLOSED
BY
~
;
A081-02
2735-013-07004
Joy Stream bank Stabilization Project
1150 River Drive
Fred Jarman
Stream Margin Exemption
William and Sarah Joy
Beach Environmental LLC
4/10/02
Approved w/ Condition
1 0/3/02
J. Lindt
f',.
('"'\
t- 'j
11
(')
n
NOTICE OF APPROVAL
To:
Julie Ann Woods, Community Development Director
Joyce Ohlson, Deputy Director
RE:
Fred Jarman, Planne~;S
Joy Streambank Stabilization Project
FROM:
DATE:
" 'fJ>
1160 River driv
1150 River Driv
Road Name
Topography
City Line
Structures
Water bodies
Parcels
c~:,
".'\"
:,;:+\
'-.;
'~ I~~.~,
^" ;;",;;, ..~ ._...~
> .~r.'.:.. '~,',
-.......,;'''.. .....
,~,,""'<,r /
~1~, '
N
W*E
',' .:1::\1.',
........
:\: . ,v':'
:"'"'' . """,'-:,,:,
.~, ,",,:~.., .
s
Recommended Action: Approval with
Conditions
Project Description: hydrologic forces are
eroding the present stream bank along 1150 and
1160 River Drive, shown above. The Applicant
is requesting approval to stabilize the bank with
an environmentally sensitive design
incorporating bio-engineering techniques such
as native plant materials, geotextile mesh, stone-
toe protection, and coir logs for a more
sensitive approach to stabilizing the bank from
further erosion.
Applicant: William and Sara Joy
Representative: Beach Environmental, LLC
Project Location: 1150 River Drive, Aspen
Zone District: R-30 (Low-Density Residential)
f"""'\
t""1
Staff Comments
Due to hydrologic forces that are eroding the present stream bank along 1150 and 1160 River
Drive, the applicants, William and Sara Joy, are requesting approval to stabilize the bank with an
environmentally sensitive design incorporating bio-engineering techniques such as native plant
materials, geotextile mesh, stone-toe protection, and coir logs for a more sensitive approach to
stabilizing the bank from further erosion.
The subject stretch of bank proposed for re-stabilization is approximately 300 feet in length and
has been analyzed into five "sites." A brief summary of the sites and proposed actions are listed
below:
Site 1:
The applicants placed an 85-foot long stone wall with a slope of 2: 1 along the southeastern portion
of the bank several years ago as a "hard fix" to erosion problems. This wall has begun to show
signs of undercutting and erosion. The applicants propose to remove the wall and replace with
fill, and install vegetative erosion control as specified in the plan. The applicants proposed to add
three boulders in the river in this section to divert flow force away from this bank area while
providing for fish habitat. Staff strongly disagreed with the boulder additions and requested the
applicant remove them from the proposed plan. With this change, Staff finds this to be an
appropriate method for stabilization.
Site 2:
This section is a 35-foot section of steeply eroded bank, which is also failing. The applicants
propose to construct a 2: 1 slope using vegetative controls. Staff finds this to be an appropriate
method for stabilization.
Site 3:
This section consists of 58 feet of somewhat eroded bank. The remediation proposed for this area
is limited to native vegetation planting. Staff finds this to be an appropriate method for
stabilization.
Site 4:
This section consists of 90 linear feet with some boulders placed for limited erosion control. The
applicants propose to remove the large boulders and to rebuild the 2:1 slope with native vegetative
controls. Staff finds this to be an appropriate method for stabilization.
Site 5:
This last area consists of a linear stretch of 32 feet, which is currently stabilized with felled logs
that are anchored into the slope with ropes to overhanging trees. The applicants proposed to
reinforce the felled logs with coir logs (a coir log is a cylindrical structure made of coconut fiber
bound together with woven twine to protect slopes from erosion while trapping sediment; they
also encourage plant growth within the fiber roll) to reinforce the erosional gaps. Staff finds this to
be an appropriate method for stabilization.
r,
r"'\
>"
(Please see the detailed written description and site sections provided in the application that outline the
proposed actions for each section)
City of Aspen Parks, Engineering, and Community Development Departments and representative
from Beach Environmental, LLC, conducted a site visit on Thursday, May 3'd, 2001, in order to
discuss the proposed project. After discussing the project with Community Development Staff, it
is our opinion, that this project can be handled as a Steam Margin "Exemption" which is an
administrative action authorized by the Community Development Director pursuant to Section
26.435.040(B)(1) of the Aspen Land Use Code which states:
Construction of pedestrian or automobile bridges, public trails, or structures for irrigation,
drainage, flood control or water diversion, provided plans and specifications are
submitted to the City Engineer demonstrating that the structure is engineered to prevent
blockage of drainage channels during peak flows and the Community Development
Director determines the proposed structure complies, to the extent practical, with the
Stream Margin Review Standards.
However, given this exemption, the project shall comply, to the extent practical, with the Stream
Margin Review Standards including a set of conditions attached with this letter specifically related
to this approval.
The City of Aspen Parks Department forwarded the following comments regarding this project.
Specifically, that 1) a detailed plant list must be submitted prior to the project commencing. The
Parks Department shall have final approval for plant species; 2) the applicant should consider
mulching the access way into the project area. No trees are permitted to be removed and no
excavation should occur within the driplines of the trees; and 3) the City Forester (Stephen) shall
be contacted for a site inspection during the project as well as a post project inspection. The Parks
Department endorses this project and commends the applicants and project engineer for taking
this bio-engineering approach to stabilize the bank, further indicating this is a good project and
should be used as a model for future bank stabilization repairs and projects.
The City Engineering Department indicated concern as to the potential for down stream scouring
or upstream flooding during peak flows as a result of changing the flow dynamics at the Joy
property due to this project. Specifically, by altering the way the river flows in direction and
capacity, there may be more serious consequences further down stream or upstream as a result.
The Engineering Department met with the applicant's representative to determine what impacts
might occur and what methods could be used to mitigate them.
The Applicant has provided a flood profile analysis to the Engineering department that
determined that the placement of 90 cubic yards of material along the stream bank will have an
almost imperceptible effect on the river's water surface elevation. This report satisfied all concerns
of the Engineering Department.
t""'\
,-"
" I
In Summary, the Community Development Department approves this project as a Stream Margin
Exemption with the following conditions:
Conditions of Approval:
1. That applicant shall ensure 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.
2. The Applicant shall provide written notice to the Colorado Water Conservation
Board prior to any alteration or relocation of a watercourse, and a copy of said
notice is submitted to the Federal Emergency Management Agency and the
Community Development Department.
3. The Applicant shall provide the Community Development Department and
Engineering Department with copies of all necessary federal and state permits
relating to work within the one-hundred-year floodplain.
4. The Applicant shall provide the Parks Department with an approved detailed plant
list prior to the project commencing.
5. The Applicant shall contact the City Forester (Stephen Ellesperman) for a site
inspection during the project as well as a post project inspection.
6. The Applicant shall provide a letter from Mike Claffy at the Army Corps of
Engineers approving the work to the Engineering Department.
Community Development Director Decision
The Community Development Director finds the Stream Margin Review Exemption is
consistent with the review criteria, and hereby approves the exemption contingent upon
coftpliance with the conditions stated herein and required for this approval.
GV\~11jlftW ~1lrt1) fstw ~~, DZ
Julie Ann Woods, Community Development Director Date
"SUPPORTING DECISION DOCUMENTATION REQUIRED AS PART OF THIS DECISION OF
APPROVAL CONSISTING OF THE ArrACHMENTS LISTED BELOW MAY BE FOUND IN THE
CORRESPONDING LAND USE FILE AT THE CITY HALL.
ATTACHMENTS:
Exhibit A -- Review Criteria & Staff Findings
Exhibit B -- Application Letter
r"\
("'\
,
Exhibit A
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; and
Staff Finding
At the time the proposed project was submitted, the Applicant did not present any
information indicating that this propose project will not increase the base flood
elevation on the parcel proposed for development. However, Staff included a
condition of this approval that required the applicant to submit an engineering
study to the Engineering Department that demonstrate~ 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. Specifically, 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.
This report has been completed and submitted to the Engineering Department; it
determines that the placement of 90 cubic yards of material along the stream bank
will have an almost imperceptible effect on the river's water surface elevation. This
report satisfied all concerns of the Engineering and Community development
Department.
2) The recommendations of the Aspen Area Community Plan:
Parks/Recreation/Open Space/Trails Plan and the Roaring Fork River
Greenway Plan are implemented in the proposed plan for development, to the
greatest extent practicable. Areas of historic public use or access shall be
dedicated via a recorded easement for public use. A fisherman's easement
granting public fishing access within the high water boundaries of the river
course shall be granted via a recorded "Fisherman's Easement;" and,
Staff Finding
Staff finds that the proposed bank stabilization project is consistent with the Aspen
Area Community Plan: Parks/Recreation/Open Space/Trails Plan to the extent
practicable by protecting the stream bank from further erosion so that soil is not
continually eroded into the stream and thereby increasing sedimentation of soil
particulates or suspended solids as well as altering the water course downstream.
A
A
,
This is consistent with Goal E of the AACP regarding protecting and enhancing
the natural environment.
3) 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 Certificates of Occupancy; and
Staff Finding
Staff referred this application to the City Parks Department who forwarded the
following comments regarding this project. Specifically, that 1) a detailed plant list
must be submitted prior to the project commencing. The Parks Department shall
have final approval for plant species; 2) the applicant should consider mulching the
access way into the project area. No trees are permitted to be removed and no
excavation should occur within the driplines of the trees; and 3) the City Forester
(Stephen) shall be contacted for a site inspection during the project as well as a post
project inspection.
The Parks Department endorses this project and commends the applicants and
project engineer for taking this bio-engineering approach to stabilize the bank,
further indicating this is a good project and should be used as a model for future
bank stabilization repairs and projects. Further, Staff has included as a condition of
approval that the applicant shall ensure 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.
4) 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; and
Staff Finding
Staff has included as a condition of approval that the applicant shall ensure 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. Further, the Applicant shall contact the City Forester (Stephen) for a
site inspection during the project as well as a post project inspection.
5) 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; and
,-".
~
j
Staff Finding
As a condition of approval, the Applicant shall be required to provide written
notice to the Colorado Water Conservation Board prior to any alteration or
relocation of a watercourse, and a copy of said notice is submitted to the Federal
Emergency Management Agency and the Community Development Department.
However, the Applicant does not intend to alter the course of the river as a result
of this project. The focus of the project work will be to reinforce the existing bank
through a sensitive bio-engineering approach treatment of the bank restabilization
with appropriate materials and plants.
Staff met with the Applicant and Engineering Department regarding any further
studies for watercourse changes. Ultimately, the Engineering Department required,
prior to approval, that the Applicant shall conduct a survey of the cross sectioning
of the existing and proposed river channel, using 3 sections and said study shall be
stamped by a licensed surveyor in the State of Colorado. Further, the Engineering
Department required a letter from a professional engineer registered in the State of
Colorado stating that no upstream or downstream degradation will result from the
proposed project. Finally, the Engineering Department required that the Applicant
provide a letter from Mike Claffy at the Army Corps of Engineers approving the
work.
6) A guarantee is provided in the event a water course is alter.ed 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; and
Staff Finding
The Applicant contends that the watercourse will not be altered as a result of this
project. Please refer to the response provided in the review standard number 6
above. More specifically, the Engineering Department required the Applicant to
conduct a HEC-RAS computer model analysis to determine upstream and down
stream effects of the project. The analysis indicated that the placement of 90 cubic
yards of material along the stream bank "will have an almost imperceptible effect
on the river's water surface elevation." In addition, "the placement of this material
through this reach of the river will have an incoIlsequential impact and is likely to
be similar to the impact of created by such natural phenomena as waves and
floating debris. This report satisfied all concerns of the Engineering Department.
7) Copies are provided of all necessary federal and state permits relating to work
within the one-hundred-year floodplain; and
Staff Finding
The Applicant provided a letter from the Army Corps of Engineers to the
property owners (Joy) that indicated that the Corps of Engineers had issued a
nationwide general permit number 13 which authorizes "the discharge of dredged
or fill materials in waters of the United States for bank stabilization." The Corps
f"1
f)
of Engineers also determined that this project "will not affect threatened or
endangered species protected by the Endangered Species Act. Your project can be
constructed under this authority provided the work meets the conditions listed on
the enclosed information sheets." The Applicant has further addressed these
conditions in their application.
8) There is no development other than approved native vegetation planting
taking place below the top of slope or within fifteen (15) feet of the top of
slope or the high waterline, whichever is most restrictive. This is an effort to
protect the existing riparian vegetation and bank stability; and
Staff Finding
This project is a bank stabilization project intended to reinforce the stream bank to
assist in flood control and correct any further water diversion as a result of the
bank erosion. The project will occur at the water's edge, which is below the top of
bank. As such the effort of the project to protect the bank stability. Staff has
included a condition of approval requiring that the applicant provide the Parks
Department with an approved detailed plant list prior to the project commencing.
9) All development outside the fifteen (15) foot setback from the top of slope
does not exceed a height delineated by a line drawn at a forty-five (45) degree
angle from ground level at the top of slope. Height shall be measured and
determined by the Community Development Director using the definition for
height set forth at Section 26.04.100 and method of calculating height set
forth at Section 26.575.020 (See Figure "A" below for illustrative purposes);
and
Staff Finding
This standard does not apply as the development takes place on the water's edge.
10) A landscape plan is submitted with all development applications. Such plan
shall limit new plantings (including trees, shrubs, flowers, and grasses) outside
of the designated building envelope on the river side to native riparian
vegetation; and
Staff Finding
Staff has required the applicant to applicant provide the Parks Department with an
approved detailed plant list prior to the project commencing.
11) All exterior lighting is low and downcast with no light(s) directed toward the
river or located down the slope and shall be in compliance with section
26.575.150; and
Staff Finding
~
(')
-2-
April 15, 2002
Staff has brought this to the attention of the Applicant and has included the
requirement as a condition of this approval.
12) 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; and
Staff Finding
The applicant has provided extensive detailed site plans including site sections
depicting the areas proposed for stabilization with extensive details regarding the
mean water elevations and proposed techniques. Ultimately, the Engineering
Department required, prior to approval, that the Applicant shall conduct a survey
of the cross sectioning of the existing and proposed river channel, using 3 sections
and said study shall be stamped by a licensed surveyor in the State of Colorado.
Further, the Engineering Department required a letter from a professional engineer
registered in the State of Colorado stating that no upstream or downstream
degradation will result from the proposed project.
Finally, the owners of the property had the property surveyed by High Country
Engineering on September 17, 2001. Cross-sections developed through the survey
were used in a HEC-RAS computer model to determine the changes in flood
elevation that would result from the proposed stream bank stabilization project.
The result of the analysis determined that the placement of 90 cubic yards of
material along the stream bank would have an almost imperceptible effect on the
river's water surface elevation. This report satisfied all concerns of the Engineering
Department.
13) There has been accurate identification of wetlands and riparian zones.
Staff Finding
The Applicant has indicated in response to the Army Corps of Engineers that the
proposed bank stabilization does not impair flow into or out of any wetland area.
~
("'l,
,"'"
Joy Stream Bank Stabilization Project
Roaring Fork River
Report Prepared by:
Jorine Lawyer & Tara McGowan
Environmental Scientist & Staff Engineer
Beach Environmental, LLC
March 8, 2001
,1
-..
.."l
G
CITY OF ASPEN
080143
i.
~~ri
I \ \
t _ \
L_J
ZONE X
PITKIN fQUNTY
CITY OF ASPEN
PITKIN COUNTY
UNlNCORPORA TED AREAS
080287
ZONE X
ZO,!e
~
>
~
CITY OF ASPEN
080143
@
IIZD
:'ON
IliL
Wl NMVlIO
.DE-.'
::nv
tSLt-Sl:6(OL6)XV.:l SLK-!il:6 (0 L6)'H'd I.~
Ug~g o::l 'N3dSV
'rOt 3Llns
1:33H.1.S NIVI'l 153M S \.L
:m 1V1N3I'lNO~II\N3 H:>V38
:SNOISV\3H
IO/eh
:3I.VO
NVlcl ;llJ6
ml'mlcl NOl1vznK!V16 )INVQrfomI16
AOOcImIcI ).Dr
Ct:
W
o
-l
::>
o
CD
C)
z
i=
(I)
x
w
VI
oc
w
9
::>
o
ID
o
W
VI
o
0..
o
oc
0..
Z
Q~
&3~
b
ocffi
0.......,
~~
I-:c
wo
z-
o:c
1Ii~
00
~~
g;;~
OCz
0.._
W
...I
o
:c
~~\Q ~
i:i: :"_-w ::I J
6j5:oZ
-lVlOCO
(l)Z~Fu
-0
o _uW
w Z I-
oozo
o-ooc
Ct:~_o..
I.,j oc~w
(LWOCO
w.Jwl-
i::! .Jw w
(l)i:i:>Z
-0
N~~1ii
w FoO
>::: uwz
(1)<><
o
w
VI
o
0..
o
oc
0..
...I
...1...1
~fi
~ ~~
.. 0
'-- JO U
-l~~Z
<i 3= .0
...1-
3w.JVI
wfji:i:fi
z::l!.......w
pW3=w
(l)OC >
w-
,::Z~!<
L,jOo..W
>:::t;wffi
(f)<OC>
-i"(J1
~-i"
o
Z
:J
...I
W
3:
o
o
Z
Iii
?'i
w
>
!;(
t;J
W
I.,j
Ct:
1---
C)
/':
i=
(I)
x
\
""
""
r-
Z
w
:2
:L
Z
<{
CD
:2
Ll.I
:1.1
;<
o
r-
If;
,,~
~
~(;>
,,~
~
~~
/To"
":'t'((l
L1J
I
'fl
VI
o
g
Q
W
r-
oc
D
(L ocO
(L _u
::> 0
(/)(/)u~
LJ
Ld D::IVI
(L.-J<OC
D f-'W
_ _.J Q VlO
J;~r .(/) w Z.J
r < y ._ -l - ::>
Ln -l .. 0
wZID
w,"-O
,_ FO
........>-uo
(/)P'1<<
VlZ
0-
0j5:
.JZ
,
i
/i
./
)<
/
<
~.
/
~/
!
\
\
~\
InJ
/>
cr
I
)
\
\
/
I I
I \
I- i , "
, \
\ ~ I \
\ ,I \
I \ \~- .--\".........
\. \ , .,
I \
"
i \ i
\
\ i
\ \
, \
, \
\
... \ \ \
,
~ \ ilIA )
, /
(
)
1""1
,-
\:'~
.'
Project Objective
To stabilize banks that are presently threatened by the erosive forces of the river on the Joy
property. The existing rock wall no longer provides adequate protection and is beginning to fail
due to undercutting and lack of restraint The pore spaces between the rocks allow sediment to
escape and will eventually lead to additional slumping and failure of the slope. A staff engineer
and scientist completed an initial survey in October 2000. Design decisions were made using a
variety of stream stabilization techniques emphasizing bioengineering. Bioengineering uses
vegetation and organic structural materials to provide stability and control erosion while
enhancing habitat and stream aesthetics. . The use of "hard" barriers such as rock is held to a
practical minimum, with the design purpose being to establish a vigorous, sustainable native or
naturalized plant community as the primary erosion control mechanism. There are a variety of
bioengineering methods that can be used in different combinations to fit a diverse set of
conditions. Using bioengineering in conjunction with principles of fluvial geomorphology will
provide an environmentally sensitive protection design.
Project Location
William and Sara Joy
1150 Ri ver Dri ve
Aspen, Colorado 81611
Roaring Fork River in Pitkin County, Colorado, below the confluence of the Roaring Fork River
and Castle Creek in the SW 1/4 of Section 1, Township 10 S, Range 85 W. The drainage area is
approximately 228 square miles. See vicinity map for details (Figure 1).
Roaring Fork River
The United States Geological Survey (USGS) maintains historical data from the Roaring Fork
River based on various gauging stations along the River. The closest USGS gauging station to
the Joy property is located near the intersection with Cemetery Lane. This station provided data
from the years 1913-1918 but was taken out of service. Due to the short time period, the flow
velocities may not be accurate due to the influence of decadal climatic regimes and post 1918
upstream diversions. However, it should give a general idea of the rivers behavior. The river
characteristically has low discharge 9 months out of the year during fall and winter, and higher
discharges during a typical snowmelt season, April -July (See Figure 2). Construction for this
project is recommended in late fall to maximize the growing season for vegetative species and
due to the dormancy requirements for cuttings.
Beach Environmental. LLC
Joy Stream Bank Stabilization
r'"'\ r\.
hearing Fork River ~lo~Veloch{
1913-191$ (Fig. 2)
c
'g 3500
1i 3000
~ 2500
.~ 2000
x
~ 1500
'" 1000
Ol
1;! 500
~ 0
<( Jan Feb Mar April May June Jl.il Aug Sep Oct Nov Dec
Month
--- Average CFS
, , I
,
I
- I
I , ,
Role of Vegetation in Slope Stability
Vegetation interacts with the bank's materials and creates long-term stabilization through the use
of a variety of processes. For streambank restoration, the role of vegetation acts threefold. First,
root systems will work to bind soil particles together in the streambank, while the exposed
branches and leaves will act to trap sediment in those portions that are exposed to water.
Second, vegetation structures will increase roughness, slowing down the velocity of water and
reducing the stress at the soil/water interface. Lastly, vegetation with non-rigid stems such as
willows will bend during high flows and effectively armor the bank.
Proposed Techniques
After review of the Roaring Fork River system on the Joy property, three major restorative
techniques were chosen to stabiiize the banks since there are several varying conditions that exist
across the site. A brief description of each technique and their respective sites will follow.
Boulder Clusters:
Strategically placed groups of boulders in the base flow channel will provide cover, create scour
holes, or areas of reduced velocity. This method benefits streams that exceed 2 cubic feet per
second (CFS). Group placement is most desirable and it is most effective in wide shallow
streams with gravel beds. The added erosive forces might cause channel and bank failures,
however they will be placed in areas upstream of the erosion site to reduce this possibility. This
technique was chosen due to the availability of materials on site. See site plan for details.
.
Beach 'Environmental, LLC
Joy Stream Bank Stabilization
-.
,-..
r'"'\
1
Brushlavering with Stone Toe Protection:
A ridge of quarried rock or stream cob.ble placed at the toe of the streambank as an armor to
deflect flow from the bank, stabilize the slope and promote sediment deposition. This technique
will be used in areas that are below the high water line where vegetation cannot be used. This
toe protection will be used in combination with soil bioengineering systems. See Figure 4 for
details
loint Plantings/ Live Staking:
This technique is useful in areas that are presently riprapped and will provide better aesthetics
and drainage of the bank. Live stakes are installed between openings of the rock into the stream
bank. Joint planting must be implemented during the dormancy period of chosen plant
species, late fall to early spring. See Figure 5 for details.
Coir Logs:
This technique uses cylindrical structures made of coconut fiber or other fibrous material and
bound together with woven twine to protect slopes from erosion while trapping sediment. Coir
logs encourage plant growth within the fiber roll. They are flexible for molding to the side of the
bank and have an effective life of 6 - 10 years. Subsequent to this time, the trapped sediment and
vegetation will provide for a stable channel. They are buoyant and require secure anchoring. See
Figure 6 for details.
Army Corps of Engineers Permitting
To protect the banks along the Joy property, fill material will be needed to stabilize some of the
undercut banks, thus subjecting this project to the federal permitting process. The Army Corps
of Engineers has the authority to issue permits for discharging dredged and fill material into
wetlands under the Clean Water A.ct u~ing a Section 404 permit. However, due to the lengthy
permitting process, a Nationwide Permit may substitute for a Section 404 under certain
conditions and limitations set by the Corps. Nationwide permits are designed to expedite
processing of projects that, individually and cumulatively, have little or no adverse effect on the
environment.
This project qualifies for a Nationwid.e Permit #13 BaIlk St:ibiHz:it@:J. The f()llowing are
terms and conditions set by the Corps under this permitting process. Under each condition there
is a written response verifying that our project falls under these conditions.
Beach Environmental. LLC
Joy Stream Bank Stabilization
"-.,,
~
,
Bank stabilization activities necessary for erosion prevention are authorized provided that
(Modified from Federal Register Vol. 61, No. 241 December 13, 1996):
A. No material is placed in excess of the minimum neededforerosion protection;
The minimum amount of material will be used to stabilize these banks. See engineering
plans for details.
B. The bank stabilization activity is less than 500 feet in length;
The 300 feet of streambank to be protected through this stabilization project is below the
maximum length.
c. The activity will not exceed an average of one cubic yard per running foot placed
along the bank below the plane of the ordinary high water mark or the high tide line;
The material placed below the high water mark will not exceed an average of one cubic yard per
running foot. Total fill to be used is approximately 140 cubic yards.
d. No material is placed in any special aquatic site, including wetlands;
Although riffle and pool complexes are present, material will not be placed in any of these
sites, or if necessary, impacted pool and riffle sequences will be replaced on-site. Ma.terial will
only be placed along the bank where it is eroding.
e. No material is of the type or is placed in any location or in any manner so as to impair
surface water flow into or out of any wetland area;
No impairment of flow into or out of any wetland area is proposed.
f No material is placed in a manner that will be eroded by normal or expected high
flows (properly anchored trees and treetops may be used in low energy areas)
Bioengineering stabilization techniques used in this project site are intended to negate this issue.
g. The activity is part of a single and complete project.
At the time of survey, only 300 feet of bank were in need of stabilization.
Bank stabilization activities in excess of 500 feet in length or greater than an average of one
cubic yard per running foot may be authorized if the permittee notifies the district engineer in
accordance with the "Notification" general condition and the district engineer determines the
activity complies with the other terms and conditions of the nationwide permit and the adverse
environmental impacts are minimal both individually and cumulatively. (Sections 10 and 404)
Beach Environmental, LLC
Joy Streambank Stabilization
5
....
?"""'\
n
General Conditions requirements for ~WP -
(Modified from Federal Register Vol. 65, No. 47 March 9, 2000)
The following are terms and conditions set by the Corps as "general conditions". Under each
condition there is a written response verifying that our project falls under these conditions
1) That the activity may not cause more than a minimal adverse effect on navigation.
There are no proposed effects on navigation activities on the Roaring Fork River
2) That the structure offill will be properly maintained
The use of vegetation for stabilization should result in a maintenance frr:e fill structure.
3) That appropriate erosion and siltation controls will be used and maintained during
construction.
Erosion and siltation will be kept to a minimum during stabilization installation.
4) That any activity shall not substantially disrupt the movement of indigenous aquatic species
unless the primary purpose of the fill is to impound water.
Proposed activities are not anticipated to disrupt the movement of indigenous aquatic species.
5) That heavy equipment must be placed on mats or other measures taken to minimize soil
disturbance,
This requirement will be adhered to.
6) That the actively complies with regional and case specific conditions.
This activity complies with all regional and case specific conditions.
7) That the activity will not occur in a component of the National Wild and Scenic River
System, nor in a river officially designated by Congress as a "Study River" for possible
inclusion in the system while the river is in an official study status.
The Roaring Fork River in Colorado is not part of the National Wild & Scenic River System.
.
8) That the activity will not impair reserved tribal rights, including, but not limited to, reserved
water rights and treaty fishing and hunting rights. .
This activity wiIl not impair any orotected federal reserved ri2:hts.
Beach Environmental, LLC
Joy Streambank Stabilization
6
,~
"..,.
n
9) That in certain states and individual state water quality certification must be obtained or
waived.
The Colorado Department of Water Resources was contacted and there are no requirements for
this activity.
10) That an individual state coastal zone management consistency concurrence must be
obtained and waived in certain states.
Not applicable in Colorado
11) That the activity will not jeopardize a threatened or endangered species as identified under
the Endangered Species Act, or destroy or adversely modify the critical habitat of such species
and, if the presence or proximity of endangered species is known, non-Federal permittee must
notify the Corps and wait for its approval.
Bill Clark, biologist for the Colorado Di vision of Wildlife has confirmed that there are no
threatened or endangered species in this particular area, and in fact a bioengineering project will
enhance wildlife habitat, water quality, and fish habitat.
12) If the activity may adversely affect historic properties which the National Park Services
has listed on, or are or may be eligible for listing on, the National Register of Historic Places,
that the permittee shall notify the Corps and wait for its approval
There are no historic properties on si te.
13) Where notification is required, that the permittee has compiled with the specific
notification provisions, including a delineation where required. A proposed mitigation plan
may also be submitted with the "Pre-Construction Notification" or PCN
As proposed, notification for this project is not required.
14) Compliance Certification - The permittee who receives a Nationwide Permit Verification
must submit a signed certification regarding the completed work and any required mitigation.
N/A. The project will not receive a Nationwide Permit Verification.
15) Use of Multiple Nationwide Permits - The use of more than one NWP fora single and
complete project is prohibited.
Only NWP 13 will be used for this project.
16) Water Supply Intakes - No activity, including structures and work in navigable waters of
the U.S. may occur in the proximity of a public water supply intake except where the activity is
I for renair of the nublic water sUTmlv intake structures or adiacent bank stabilization.
Beach Environmental, LLC
Joy Streambank Stabilization
7
,,-,
n
The activity will not be in the proximity of a public water supply intake.
17) Shellfish Beds - No activity may occur in areas of concentrated shellfish populations.
The activity does not occur in areas where shellfish are present.
18) Suitable Material. Fill materials may not consist of unsuitable material such as trash,
debris, car bodies, asphalt, etc.. Materials used for construction must be free from toxic
!pollutants.
All fill will be of suitable material and will be approved by Beach Environmental.
19) Mitigation - The project must be designed and constructed to avoid and minimize adverse
effect to waters of the US to the maximum extent practicable. Mitigation will be required when
necessary to ensure that the adverse effects to the aquatic environment are minimal.
No mitigation is necessary for this project.
20) Spawning Areas - Activities including structures and work in navigable waters of the
United States or discharges of dredged or fill material, in spawning areas during spawning
seasons must be avoided to the maximum extent practicable,
Spawning of the native cutthroat trout and non-native rainbow trout takes place in the Spring.
Brook and Brown trout are fall spawners. Stabilization work will be scheduled for late fall,
winter, or early summer to avoid spawning season.
21) Management of Water Flows. To the maximum extent practicable, the activity must be
designed to maintain preconstruction downstream flow conditions. Furthermore, the activity
must not permanently restrict or impede the passage or normal orhighflows.
The project will not affect downstream flow conditions or restrict normill or high water flows.
22) Adverse Effectsfrom Impoundments. If the activity, including structures and work in
navigable waters of the US or discharge creates an impoundment of water, adverse effects to
the aquatic system caused by accelerated passage of water shall be minimized to the maximum
extent practicable
This project will not cause impoundments of water.
23) Waterfowl Breeding Areas - Activities into breeding areas shall be minimized to the
maximum practicable extent.
This project does not affect waterfowl breeding areas.
24) Removal of temporary fills - Any temporary fills must be removed in their entirety and the
affected areas returned to their preexistinJ! elevation.
Beach Environmental, LLC
Joy Streambank Stabilization
8
~
,~
All temporary fills will be removed at the conclusion of this project.
25) Designated Critical Resource Waters - Projects are not authorized in critical resource
waters without DubUc avvroval.
The Roaring Fork River is not a critical resource water.
26) Fills within 100-year Floodplains - Above grade fills within the 100 year floodplain are
not authorized by NWP 29,39,40,42,43, and 44. For NWP 12 and 14, the permittee must
notify the District Engineer in accordance with General Condition 13 and document that any
permanent above grade fills in waters of the US within the 100 year floodplain comply wilh
FEMA construction requirements.
N/A. Application is for a Nationwide Permit #13
Site Plan Details:
The entire length of stream bank that requires restoration is approximately 300 feet and is broken
up into four different sites (see site plan for details). Each site requires different methods of
stabilization.
Site 1: Stone Wall
The existing stonewall extends for approximately 85 linear feet and is not providing adequate
erosion protection to the bank. Small gaps between the stones have allowed water to infiltrate,
and remove sediment from behind the stonewall and slumping has commenced. The corrective
course of action involves removal of the stonewall and rebuilding the slope (2: 1) using vegetative
erosion controls. The base of the slope will use stone-toe protection up to the high water mark.
Geotextile mesh and burlap will be used underneath the stone-toe protection and to hold the fill
of the rebuilt slope while the vegetation takes root. Native vegetation provided by Rocky
Mountain Native plants will be used above the high-water line and placed in holes made in the
geotextile mesh. 6).
Additionally, three boulders are proposed to be placed in the Roaring Fork River for water
deflection away from the bank and to create fish habitat downstream.
See site plan for details. Erosion control techniques are illustrated in greater detail in figures 3
and 4.
Beach Environmental, LLC
Joy Streambank Stabilization
9
':t.:
.~,;
r-
f~
Site 2: Steep Eroded Slope
This area extends 35 linear feet and is currently failing. The corrective course of action involves
rebuilding the slope (2: 1) using vegetative erosion controls. The base of the slope will use stone-
toe protection up to the high water mark. Geotextile mesh and burlap will be used underneath
the stone-toe protection and to hold the fill of the rebuilt slope while vegetation takes root.
Native vegetation provided by Rocky Mountain Native plants will be used above the high-water
line and placed in holes made in the geotextile mesh.
See site plan for details. Erosion control techniques are illustrated in greater detail in figure 4.
Site 3: Slope supported by small boulders
This area extends 58 linear feet and has small pockets of erosion. Due to the small amount of
erosion in this area, only vegetative erosion controls are needed. The stable slope and presence
of some vegetation alleviates the need for geotextile mesh in this area. Native vegetation
provided by Rocky Mountain Native plants will be used in places sparse of vegetation.
See site plan for details. Erosion control techniques are illustrated in greater detail in figure 5.
Site 4: Slope supported by large boulders
This area extends 90 linear feet; the current. erosion protection is large boulders placed under the
bank. The corrective course of action involves removing the large boulders, and rebuilding the
slope (2: 1) using vegetative controls. The base of the slope will use stone-toe protection up to
the high water mark. Geotextile mesh and burlap will be used underneath the stone-toe.
protection and to hold the fill of the rebuilt slope. Native vegetation provided by Rocky
Mountain Native plants will be used above the high-water line and placed in holes made in the
geotextile mesh.
See site plan for details. Erosion control techniques are illustrated in greater detail in figure 4.
Site 5: Slope supported by felled logs
This area extends 32 linear feet. Current erosion protection is felled logs that are anchored into
Beach Environmental, LLC
Joy Streambank Stabilization
10
~ +-
~....-.. .c._-'
,,,-,,
r->;
the slope with ropes. The corrective course of action for this area is to install coir logs beneath
the felled logs to fill in erosional gaps. The ropes will be removed and boulders will be used to
anchor the existing logs.
See site plan for details. Erosion control techniques are illustrated in greater detail in figure 6.
Beach Environmental, llC
Joy Streambank Stabilization
11
.. .,.,.-~.~
'1 BEACH ENVIRONMENTAL LLC
715 WEST MAIN STREET
SUITE 304
ASPEN, CO 8161.1
.... P.H.(970)925-3475 FAX(970)925-4754
....
~
n
""
......'...
. ..- "~,
JOY 5TREAM BANK 5TABIUZATION FROJEcr
VICINIlY MAl"
fiGURE I
DATE:
11/6/00
REVISIONS;
JOB NO.:
0269
.f.::,.. _. ,~
TOP OF BANK
....
BOULDER CLUSTER
AREA OF EROS/ON ~
SITE 1 (ROCK WALL)
A METHOD OF LOCATING BOULDER CLUSTERS
Boulder clusters to be located based on
field conditions.
TOP OF BANK
NORMAL
STREAM
LEVEL
ROCK SHOULD BE
2' DIAMETER
OR LARGER
y
~
/(v
$;'
~y,
~
~~
/~V
NOT TO SCALE
r HIGH WA TER
~
::>
u
o
'"
Z
:J:
o
-,
'"
0>
0>
~
." ," "-". "'"
STREAMBEf1. 'v
-'/ / /-/ /'>//
12u:::-;] ." '" <'
(300mm) L \'\ /' ,,/)
KEY BOULDER
INTO STREAMBED
CROSS SECTION
@
'1 BEACH ENVIRONMENTAL LLC
715 WEST MAIN SlREET
. SUITE 304
ASPEN. CO 81611
. P.H,(970)925-3475 FAX(970)925-4754
JOY STREAM BANK STABILIZATION FROJECT
DETAIL OF BOULDER CLUSTERS
FIGURE 3
~..;~_.
DATE:
11/5/00
REVlSJONS:
SCALE:
NTS
DRAWN BY: JOB NO.:
JM 0259
.,~;..:=",~.-.,,-
r>,
n
FRONT OF SLOPE
BACK OF
TERRACE
CEO TEXTILE MESH
AND BURLAP
Crisscross branches
5-8 branches/ft. min.
(20/!inear meter)
placed at random with
regard to size and age.
I
I
I
I
GEOTEXT/LE MESH
AND BURLAP
PLAN VIEW
.... . ---
MHW
~
. .. ~.
. 0
.0
.<1
. .
. 0
o
. ..d'
'..
MLW J.oo
-.:..: 0 . 00 ".
v . . ,Q--:-.a....o", CI
10'-20' . .~. ~~.<1 ,. :
. 4" ~
<1." T.- -; -'-.":;;- . . ~.. .. xl <~
o ..<.; . 0 . a. ;&.>V/'-
" . . . . . . .".. .. A.-'--- ,V /, '%:'
. .' ~';::S'>" - ~ - - '-c,,'-
~ . ;, ~<(:;(0
:..--//0>>>""/~\
NOTES: - /'/A'-
.,
f. Tilt branches down into the slope 10'-20' min.
2. Brushlayering may be constructed with non-compacted or compacted backftll
without damage to the brush layer.
3. Branches irrespective of length, should protrude 8-f81n. (0.20-0.50 meters)
beyond the face of the slope.
4. Holes to be cut in burlap to allow plantings through. .
~
::>
\:i
:>
z
:I:
o
-,
'"
'"
'"
@
'1 BEACH ENVIRONMENTAL LLC
715 \'<EST MAIN STREET
SUllE 304
ASPEN, CO 81611
. P.H.(970)925-3475 FAX(970)925-4754
JOY STREAM BANK STABIUZATION PROJECT
DETAIL OF BRUSH LAYERING
FIGURE 4
DAm
11/6/00
REVlSIONS:
DRAYtN BY: JOB NO.:
..A.f 0269
, --..."",,-,
,,-,.,
n
TYpical use of willow stakes
to anchor willow wattles,
straw rolls, bio mats, or turf
reinforcement mats.
r/iON~
TYpical area staking
1-3ft. (0.3-1m) apart.
TYpical - drive or plant
willow stakes through
openings in riprap or
gabions.
r Cut top of stake square.
1 \ 2 to 5 buds scars shall
be above the ground.
)
NOTES:
,. Harvest and plant stakes during the
dormant season.
2. Use healthy, straight and live wood
at least 1 year old.
3. Make clean cuts and do not
damage stakes or split ends during
Installation, use a pilot bar in firm SOils.
4. Soak cuttings for 24 hours (mln.)
prior to Installation.
5. Tamp the SOil around thtl stake.
I
V- Trim branchtls close.
l
J~
)'//
.'
3/4-3In. (20-75mm) diamettlr.
Plant 80% of stake
length into the groun~
angled cut at butt-end,
butt-end down.
@ 2000 JOHN McCULlAH
'1 BEACH ENVIRONMENTAL LlC
715 WEST MAIN STREET
SUITE 304
ASPEN, CO 81611
P.H.(970)925-3475 FAX(970)925-4754
JOY 5TREAM BANK 5TABIUZATION f'ROJECT
DETAIL OF JOINT f'LANTING5
FIGURE 5
DATE:
11/6/00
REVISIONS:
DRAWN BY: JOB NO.:
.,1M 0269
~.
._.,.....e:....,.
I"""]
~
. ,
PLACE COIR ROLLS PARALLEL
TO THE STREAMBANK ALONG
A HORIZONTAL CONTOUR
,
!\
!:'.\,~
]....:'.\,
i,' '.,
'. ' "-
\;~:".:""'>,~
" .. ,
\\:~"~>>\ \,'
'\' . . ':. \...A...-^- ,; II
" "I
.... " I I
, ",.'-1
\ T .,\:,,'; /'(
\.',:~". . 12)1 """\ 'J' ,
))'::'/6fJOmm) '~, k
//" '. j , "~j
'.;.;,:".., . .
'/ ' . ...:." ',' '; . :. ~'I.>.;~~~~ \<)\:'
.'. ~0Q,<f~.::::~,:~'::,,::,::" :::,:~..:;.~~S,
" //'-//v' /{/ /~///
/~<j<'~~" v("- ' 0
~ ~ I.~
\
t"
Vj
1
y
~,,,'
<>
."-
z)
i, 1/2" X 1 1/2"
(38 X 38 mm)
RECOMMENDED
c.:>
DOUBLE STAKES OPTIONAL
REQUIRED FOR OFFSHORE
INSTALLA TlON
LENGTH OF STAKE
DETERMINED BY THE SUBSTRATE
PLACE CO/R ROLL SUCH THAT THE ROLL EXTENDS
2" (50 mm) ABOVE MEAN WATER ELEVATION
MEAN WA TER
ELEVATlON~
2"
.
:.
~
::>
u
o
'"
:z:
0:
o
,
<0
0>
'"
~
--. r--^' ,r')
'; ..\,..'.........' /...:-<- ...." /:.
;./,;...~>'. "'\." >"'- ,"-.:.,,- '" /";., ;/, '..~<;,<
.,/ > /' / ;--.,/ / <;, J '''-///.
o /....
"
NOT TO SCALE
@
{~-;
'1 BEACH ENVIRONMENTAL LLC
715 'M::ST MAIN STREET
SUITE 304
ASPEN. CO 81611
P.H.(970)925-3475 FAX(970)925-4754
JOY 5TREAM BANK 5TABIUZATION PROJECT
DETAIL OF COiRo LOG5
FIGURE b
DRAWN BY: JOB NO.:
..1M 0269
DATE:
11/6/00
REVISIONS;
.~,~,-
..-.:;;,;0...'-.:;.....>-
"
r-.,
~
? 3
..
"
./
~
PLACE .COIR ROLLS PARALLEL
TO THE STREAMBANK ALONG
A HORIZONTAl.; CONTOUR
,,<,.,
':\ .-"""""'-.~
..,. '.\
.::;,
.r----.-~
j',>"
:....'\,.J"-~
.... n.,
.,---,"..-...
,.......;.-.
7L~~'
-:(8POn;m)
J..
. . .
':..~:'
.,
.,
,,.; J!'.
LI 1/2N X 7 1/2N
(38 X 38 mm)
RECOMMENDED
':=)
DOUBI.E STAKES OPTIONAL
REQUIRED. FOR OFFSHORE.
INST;4LLATlON ~
..' LENGTH- OF STAKE
- DETERMINED 9Y7HE SUBSTRATE
,.'.,
Pl.J!CE.cafR ROLLSUC1:t...71fAT. THEROI.LEXlEl/.DS.. ...
-,--':z;'!,/= ---+.;486E:~~........ ~H-~7 ~c(;,~ .
.."".._., t~_u.~~'~ , ..... ~-",.. .......'. '-'." ""~-::~.
....~~
< ' ,....,.
Y; ".'''.'' '..i.' ,,;..... <'';.i' ",/,
F....'." ./," ,,' 7;...' .., ..../>.
/,//).... /':,) , '.....J'//.
(:J /,
"
,'---,
NOT TO SCALE
~
M54N WATFR
ELEVATION,
'\ 2N
.......
~
,...,
\../
'1 BEACH ENVIRONMENTAL ~iic
1'5 v.EST MAIN STREET
SUITE 304
ASPEN. C08tStt " ;. . .
. P.H.(970)925-:-3475 FAX(97e)925-475<$
JD'( STREAM BANK 5TABIUZAT10N PROJECf
DETAIL OF COIR LOGS
FlGUREG
DATE: , SCALr:::
t1/a/CO Nl$
RE"SlOHS:
'l6 .C.
CltlJ .
>
1").
f)
~1::"""'f~'H!E~"
~"'l.~~.t"~~."~ tJj IbU
Beach
OCI -5 20111
CllY :t'i\lG@'J,lEEA
r-~
Resource Management, LLC
Nick Adeh
City Engineer
City of Aspen
130 South Galena St
Aspen, CO 81611
Re: Joy Streambank Stabilization Project Aspen, CO
Dear Nick:
At your request we have undertaken and completed a flood profile analysis of the
Roaring Fork River at the William and Sara Joy property near the northwest city limits
of Aspen, Colorado. The Roaring Fork River along the Joy property was surveyed by
High Country Engineering on September 17, 2001 and cross-sections developed
through the survey were used in a HEC-RAS computer model to determine the changes
in flood elevation that would result from the proposed streambank stabilization of the
left bank of the Roaring Fork River adjacent to the Joy property.
To paraphrase the conclusions of this study and report, the proposed placement of 90
cubic yards of material along this bank will have an almost imperceptible effect on the
stream's water surface elevation. In fact, in order to produce a measurable result it was
necessary to calculate the surface water elevation change on a ten-year event. It is the
engineer's opinion therefore that the results of this study indicate the addition of 90
cubic yards of fill through this reach of the ri ver will have an inconsequential impact
and is likely to be similar to the impact created by such nat1.1ral phenomena as waves
and floating debris.
Therefore, we believe that the City of Aspen can now move forward with the issuance
of a permit to allow the streambank stabilization project to proceed. Should you have
any questions regarding the HEC study please feel free to give me a call.
Sincerely,
Gary~
715 W,.Main
Principal
wi attachment
Cc: S. Broderick
02691.streambank_stabilization.l00201
Suite 304
Aspen. CO 81611
Tel (970) 925-3475
Fax 925-4754
r'J
n
MEMORANDUM
To: Fred Jarman, Planner
From: Richard Goulding, Project Engineer
Date: May 25, 2001
Re: Joy Stream Meeting
Attendance: Nick Adeh, Fred Jarman, Gary Beach, Richard Goulding
On Thursday, May 24, 2001 Gary Beach met with the City Engineer, Nick Adeh to
discuss the requirements for stabilizing the Joy stream bank. The following conditions
are to be met to ensure approval from the engineering department: .
1) Completion of a survey of the cross sectioning of the existing and proposed river
channel, using 3 sections and is to be stamped by a licensed surveyor in the state of
Colorado
2) A letter from a professional engineer registered in Colorado stating that no upstream
or downstream degradation will result from the proposed development
3) A letter from Mike Claffy at the Army Core of Engineers approving the work
Lov("S
5"C/3
1'"'"'\
r)
Beach Resource Management, LLC
IMPACT OF STREAMBANK STABILIZATION
PROJECT ON FLOOD HEIGHT OF
ROARING FORK RIVER
,,,tnlllll,,
,".., ^LT"' "1
,,,~~ 'f;'t l""\ t;; l"i ;';
~... ~. 01'1..... rr L:I';
...~. .O<:-G\STEfi>e:.'" "~'...
~\" ..,~0- () ." 7....,....-:.
. . o-~
:.:.......'1... .0 <.Po:.
:<-- ~ '-kl- ... m::.
;- ov eo' V"eJ' : Z;
:Jt(- , "':'",:
".. Jv. T-
~ "'...~.\ 4:'./":0 ~
..../\ (> US' r,.' "'L""\. ..
.....",~~J,'.,,:ONAL "€.~*..\.",,'V.......,...
"'... 1:0"".....O<?:-";,~......
#"11 F CO\..: ".....
""auuu,\\\
Property of William and Sara Joy
1150 River Drive
Aspen, Colorado
SW % T 10 N, R 85 W
.28 September 2001
William W. Hansen
Registered Professional Engineer
Red Feather Lakes, Colorado
BRM 3.01
()
William W. Hansen, P.E.
Water Resource Management Consultant
663 Socorro Trail PO Box 227
Red Feather Lakes, Colorado 80545
(970) 881-3500
28 September '01
Mr. Gary L. Beach
Beach Resource Management, LLC
715 West Main, Suite 304
Aspen, Colorado 81611
RE: Flood-Profile Analysis
Joy Streambank Stabilization Project
Your File No. 0269
Dear Gary:
This letter and the attachments thereto constitute our report on an investigation of the hydraulic
characteristics of the Roaring Fork River where it flows past the Joy property in Aspen,
Colorado. The purpose of the investigation is to evaluate the changes in floodwater elevation
that would result from a proposed streambank stabilization project on the left bank of the
Roaring Fork along the Joy property.
PROCEDURES
Basic data and procedures were obtained from
1. the Flood Insurance Study (FIS) for Pitkin County, published by the Federal Emergency
Management Agency (FEMA) in June, 1987,
2. a field survey conducted by High Country Engineering on 17 September 2001,
3. computer software developed at the Hydrologic Engineering Center (HEC) of the U.s.
Army Corps of Engineers for analysis of river hydraulics; the most recent version is
entitled HEC-RAS (River Analysis System), Version 3.0 released January 2001, and includes
many modifications and improvements to the earlier version (HEC-2), and
4. our own reconnaissance and examination of the site and your files on 10 September 2001.
In addition, we have requested the computer printouts of the input and output files of the FIS to
see if the data can be incorporated into our investigation. Presumably it is the events of
September 11th that have delayed the processing of our order by the FEMA archives in Virginia.
1""'"\
(')
Mr. Gary L. Beach
28 September '01
Page 2
PROJECT LOCATION
The study area is approximately one mile northwest of downtown Aspen, as shown on Figure 1.
The base map for Figure 1 is the Flood Insurance Rate Map (FIRM) for the City of Aspen,
published by FEMA as a companion document to the FIS and bearing the same date of
publication.
Also shown on Figure 1 are the locations of the cross-sections used in the FIS as well as the cross-
sections surveyed by High Country Engineering on September 17'h(Sl, S2 & S3). It can easily be
observed that the FIS cross-sections at DKand DL would be particularly useful if tying these two
studies together were of any importance.
SUMMARY OF RESULTS
The ten-year flood for the Roaring Fork developed in the FIS was used as a baseline discharge
for this analysis. A f10wrate of 3700 cubic feet per second is reported as the appropriate value
for the Roaring Fork immediately upstream from the confluence with Maroon Creek. When
projected onto the geometric configuration of the river in the study reach the profiles plotted on
Figure 2 are obtained.
[Nb: on several of the figures and tables the elevation is reported as the truncated value of
elevation above Mean Sea Level, i.e.. an elevation of 7742.65 may be written as 42.65 for
convenience.]
The profiles are virtually indistinguishable at the vertical scale of Figure 1, which has been
exaggerated as much as possible to maximize the difference. Only on Table 1, the standard
output format for HEC-RAS, can any difference be detected. The figures in bold represent the
elevation of the water surface during the lO-year event. The italicized figures represent the
addition of approximately 90 cubic yards of fill material along the left bank required for the
stabilization thereof.
The maximum increase that is prediCted by this procedure is 0.12 feet at the upstream end of the
Joy property. This value is not only negligibly small but may be misleading due to the fact that
it constitutes the solution to a highly sophisticated mathematical equation with a small change in
the value of only one boundary condition. In reality, the complexities and irregularities of the
channel, floodplain and river flow will cause departures from predicted flood stages that will be
well in excess of 0.12 feet.
t""",
f"'\
Mr. Gary L. Beach
28 September '01
Page 3
SUMMARY OF INPUT DATA
The geometrical data used in the HEC-RAS simulation were obtained from the field survey
conducted by High Country Engineering on September 17th. The cross-sections are shown in
their relative locations on Figure 1 and are plotted on Figure 3.
The 90 cubic yards of fill material required for the stabilization of the embankment is assumed to
be uniformly distributed throughout the 300-foot length of bank on the Joy property.
Therefore, the average reduction in cross-sectional area will be approximately 8 square feet.
The rectangles in the diagrams of Figure 4 are scaled to approximately 2 feet wide by 4 feet
high, or about 8 square feet. The modified configuration of the stream bank has been drawn so
as to increase the bank volume by roughly the same area as that of the rectangle. The bank
configurations labeled as "Proposed" on Figure 4 resulted in the profile labeled "Proposed" on
Figure 1 and the portion of Table 1 headed "With Proposed Embankment Improvements".
CONCLUSIONS
The linear approximations to the "before and after" geometry of the left bank result in a
predicted increase of 0.12 feet in the lO-year water surface elevation. It is our opinion that this
purely mathematical result is inconsequential in comparison to the variations in the water surface
that are caused by natural phenomena such as waves and floating .debris.
I hope that this report provides the information needed by staff of the City of Aspen and of
Pitkin County. Please feel free to call if there are any questions or need for further investigation.
Sincere y your,
W\X/H/lg
Attachments (5)
MOUNTAIN VIEW DRIVE
i
f"";,
f)
ZONE X
..~,
/t..'
,-r
0'
,:'l,/
!o.'\:
, ,
"
,
"""~~~O
ZONE AE
",___.i.
':~',-::'~;::'-Q."~=-=:'~~:'~~~'{~h}i..t.::
~-;
r..(.
.,
.
>
,
M.
~"1
'.
-......."
\. --........,.~,
"',,\
\\
. /)
v..-/
c"
"
,
,
I
!
I:
i I
, ,
'I 'J
I!
!~!
/2j
ROARING FORK RIVER
N
! "
ii
I~I'
IOi
101
I<i
Iw'
!:l!
II
, ,
ZONE X
Figure 1: LOCATION OF STUDY REACH
AND CROSS-SECTIONS
/'.-CI6.bfi~LC~:'-'._"----
: i
~
SCALE: 1 inch = 500 feet
".~..~L.,._, ii'"
li---~~si"'---'; I
/ ,I ...........-, ~~~
i" .'~.-.
I I .-! _
" II
__=_'--.,',/ 'i
- '-..- .:'(
,.'~,:- '. '~ts-t:--"....,:' L
41 _..#'irl-"".",
/~i i..i -tL<tqtQ,.;:.._
.,!;;./ 1101' ~
, .::'
e
(Base map from FEMA Flood Insurance Study
completed April 1985, published June 1987) ,
I r-"_~. ()\.-..__, 0;"... '-..' .--__ ''--.'-.
J
^
n
.....
p
:8 00 00..,
E 3: '" 3:31
c:
'" !>.= ~ 0
e '" 0.
o .~ o E
Iii -.. _ 0.
I f ,
I 11
I
1 ---- -- ---.------ M .-.-.-.-. .-.---.-.---. '-'-T-'-'-' .-.----------
tIl
. \
. \
.
\
\
___A -.-----.-. N --.-.---- --.-----.---- .-.-.-.-.-\ --.-.-.-----
tIl
1\
. \
\
\
\
\
\
\
\
_.- .- 1..-.-.-. ~ -.-.-.-.-- ------.-.---- --.---------. .-.-.-.-.\.-
tIl
Cl
C
';::
CD
CD
c
'51
c
w
~
-
C
;:,
o
o
.c
.!2l
:I:
>-
.c
>-
CD
C:
;:,
lJ)
-
Q.
CD
lJ)
""'
.....
E
.g
CIS
-
CIS
C
to)
.;::
-
CD
E
o
CD
C>
<Xl
~
to
~
~
~
N
~
o
~
<Xl
'"
(wnJl!p lSW ll:lJl!W OJ OOLL ppl!) Jaal 'UO!Jl!^aI3
o
o
r--
'"
N
'"
o
o
to
Ui
i:i:
...
...
'"
~
.c
<.l
-
..
E
o
-
o
00
00
"':0:
~
ill
'"
't:l
't:l
.!.
-
..
~
or
<.l
C
.l!l
..
C
o
o
~
'"
'"
'"
o
o
",'"
'"
en '"
w 0
..J 0
u: >- i:i:
1:: <(
0 CD :2
~ Q. w
0 "-
D.. ... E
ll..
C >- e
o 0 -~
..'"
o~ _<XJ
U(J')
..J cu o~
o -
LL ... ..."-
CD '" ..
~ .~ II c
<(0:: ::J
......,
W-" 0>",
>;- () 002
.c III
ou.. l;j",
.- >-
.... Cl "'",
C '" ::J
N ';:: 0-
o(/)
ell cu 0:: ..
0 ~ U
... III C
::l0:: .. III
.2' >-~
, ::J
0..
LL :S.E
z
0
i=
<( >-
..J 1::
:::> <Il
:2: 0-
e
(l) a.
() >-
0
..J ....,
-
:::> <Il
~ ~
<Il
>
0 ~
>- .,.;
J: ~
0
() LL
Ol
W c:
J: .;::
<Il
LL. 0
0 0::
(f) -ci
0
I- 0
..J u:
:::> ~
(f) <Il
W ~
0:: ,
0
~
....
CII
:c
ell
I-
I""".
r-
.<=
()
"'" C\/ ~ (')
<Il l() <0 V
" c:i 0 0
::s
e
LL
.<=
'6 lO .... ro
s: ~ .... l() '<I:
;::: cO ro ~
~ (') 0
0- ro
0 ~ ~
I-
<Il
~ ~ ro .... lO
-< ;::: C\/ C\/ ~
~ ~ C\/ or; lO
.... <0 ~
0 -.:;. l() V <0
u:
C
.<= lil v lO lO
() :;:, lO Ol <0
~ :::: cO .... cD
C/) <Il
2 0- .... .... C\/
0 0 lO V 0
Ci.i :;::- Ol ~ Ol
i= - v .... C\/
:;:, a a 0
is CJ :::: 0 a a
2 ui c:i c:i c:i
0
()
CJ >
<Il
2 iii ~ v ro
i= ~ ro ~ ~
;S r-: .... <0
C/) CJ v v v
X ui
w
..
.... (j)
c: :s: C\/
:l :;::- l()
0:: -
- ~ C\/
.;:: V
()
>
<Il oqo CD N
iii =- .... N co
CJi - ,..: <D on
~ oqo oqo oqo
iii
.<= ro lO lO
() :;::- ~ C\/ '<I:
- 0;
~ ro <0
c: (') (') (')
~
""iii I., 0 0 a
-
0 - a a 0
I- u .... .... ....
0 ~ (') (') (')
<Il
Ci5
~ (') ('oJ ~
<Il
>
~
E E
c: - <Il
0 <Il .s ~
U ~ I~ -
l/)
<Il ~ " c:
(j) ~ ~
::l 0
0
r1
:c
()
"'" ~ (') (')
<Il l() <0 v
" c:i c:i a
::s
e
LL
.<=
- .... <0
" l()
s: ~ ~ ~ l()
S (') 0; ~
0- V ro 0
0 ~ ~
I-
<Il
<Il ~ .... <0 C\/
~
-< ;::: ~ ~ ~
~ r;r ~ Ol cD
l/) ro l() ~
0 ~ lO V <0
C/) u:
I-
2
W C
:;: .<= ~ <0 <0 lO
W () l/) v 0 <0
:;:,
> Qi - cD cO cD
~
~ >
a. ,~
:;: 0 .... C\/
0 <0 <0 a
I- Ci.i :;::- .... oqo Ol
2 - v .... C\/
:;:, a 0 a
W CJ :::: a a a
:;: ui c:i a c:i
~
2
<C >
lD <Il ~ V lO
:;: iii <::; Ol (') (')
W ~ r-: .... cD
0 CJ v v v
W ui
C/)
0
a. (j)
0 :s: C\/
0:: :;::- ~
-
a. - ~ ('oJ
.;:: v
J: ()
I-
~ >
<Il
N iii I;: '" .., '"
'" .., CD
c: CJi I:: r-: cD lIS
:l "l' "l' "l'
0:: ~
iii
.<= ro lO lO
() ~ ~ ('oJ '<I:
S 0; cO <0
c: <') (') (')
~
""iii ~ a 0 a
-
0 .l!! a a a
I- !-S .... .... ....
0 (') (') (')
<Il
-
(j)
~ (') ('oJ ~
<Il
>
~
E- E
c: <Il
0 m .5 ~
U ~ ~ 1ii
<Il ~ " c:
(j) ~ ~
::l 0
0
,..., (1
Figure 3: CROSS-SECTIONS
Roaring Fork River at Joy Property
Based on field survey of 17 September 2001 by High Country Engineering
CROSS-SECTION 1, Upstream Property Line (HEC Sta. 3)
7775
7770
7765
5 7760
::::
'" 7755
ii
u:; 7750
7745
7740
7735
o
~
-. /
/
/
/
"!. ~ I~
50
100
150
200
250
Distance, feet
CROSS-SECTION 2, Midpoint of Property (HEC Sta. 2)
7770
7765
7760
c
0 7755
::::
'"
ii 7750
u:; 7745
7740
,/
/
/
- '/
~ 1 . ........
.~
7735
o
20
40
60
60
100 120 140 160 160 200
Distance, feet
CROSS-SECTION 3, Downstream Property Line (HEC Sta. 1)
7770
7765
7760
c
0 7755
~
> 7750
"
u:; 7745
7740
7735
o
.. V
/
/
1/
..
. ~
20
40
60
60
100
120
140
160
Distance, feet
1""'\ ()
Figure 4: APPROXIMATIQN OF CH.4.NGgS to
CONFIGURATION OF CROSS-SECTIONS
(Left bank facing downstream)
Station 3 (xsec 1) Station 3, Upstream PL (xsec 1)
Distance Surveyed Filled 48
0 47.99 46 ~
54.3 46.54 " 44
55.7 46.23 46.23 0 k
:;:;
<Il 42
58.4 44.47 45 > ~ 1__ Su~eyed ~I
..
60.8 41.37 43 W 40 -II- Proposed
65.8 39.68 39.68 ..
73.8 39.56 38
36
0 10 20 30 40 50 60 70 80
Distance, feet
Station 2 (xsec 2) Station 2, Intermediate PL (xsec 2)
.
Distance Surveyed Filled 48
~
46 ......
0 46.48 ,
25.6 46.98 " 44
32.8 45.89 45.89 0
:;:; l:--su~eYed,1
35.5 43.57 45 <Il 42
a; ___ Proposed
36.2 40.44 45 W ..
40
40 39.7 39.7 ........
46.2 38.64 38 -....
57.8 38.8
65.8 38.2 36
0 10 20 30 40 50 60 70 80
Distance, feet
Station 1 (xsec 3) Station 1, Downstream PL (xsec 3)
Distance Surveved Filled 48
0 43.8 46
.
26.3 41.75 41.75 ,,44
29.4 40.84 41.75 0 ~ ---
:;:; l--su~eyed,l
31.1 38.78 40.6 <Il 42
a; ~ ____ Proposed
35 38.5 38.5 W 40
39 38.2 ~
47.3 37.83 38
59.8 37.63
36
0 10 20 30 40 50 60 70 80
Distance, feet
~ '
I"".
",...." 1 ,
r..r;;;pJr\( ('! b!iac~ '1(:sovl3\;~ ,C(lv"t
DEPARTMENT OFTHE ARMY
U.S. ARMY E'J8iNEER DISTRICT, SACRAMENTO
CORPS OF ENGINEERS
1325 J STREET
SACRAMENTO, CALIFORNIA 95814-2922
November 15, 2001
REPLYTO
ATTENTION OF
Regulatory Branch (200175496)
~
william and Sara Joy
1150 River Drive
Aspen, Colorado 81611
Dear Mr. and MrS. Joy:
We are responding to your request, Elub:miti:ed by Beach
Environmental, for a Department of the Army permit to perform
streambank stabilization on approximately 300 linear feet of the
Roaring Fork River. The project is located just below the
confluence of the Roaring Fork River and Castle Creek within the
SW 1/4 of Section 1, Township 10 south, Range 85 West, Pitkin
County, Colorado.
The Chief of Engineers has issued nationwide general permit
number 13 which authorizes the discharge of dredged or fill
material in waters of the United States for bank stabilization.
We have determined that your project will not affect threatened
or endangered species protected by the Endangered Species Act.
Your project can be constructed under this authority provided the
work meets the conditions listed on the enclosed information
sheets. You must send a signed letter of certification to the
Corps of Engineers within 30 days after completion of the work
(see general condition number 14). A copy of the certification
statement is included for your use.
This verification is valid until ~bruary 11, 2002. If you
have not completed your project by that time, you should contact
the corps of Engineers to obtain information on any changes which
may have occurred to" the nationwicte permits. Ybuare responsible
for remaining informed of such changes and for ensuring that all
contract personnel are familiar with the terms and conditions of
this permit.
.\1 ~ .~,.. " i ....
^
l'. ,
l
-2-
We have assigned number 200175496 to your project. Please
refer to this number in any correspondence with this office. If
you have any questions, please contact Mr. Randy Snyder of this
office or telephone number (970) 243-1199, extension 12.
~ ------
Ke son
ChI f, olorado/Gunnison Basin
, Re atory Office
402 Rood Avenue, Room 142
Grand Junction, Colorado 81501-2563
Enclosures
copies Furnished:
Mr. Gary Beach, Beach Environmental,
street, suite 304, Aspen, Colorado
Pitkin County, 506 East Main street,
LLC, 715 West Main
81611
Aspen, Colorado 81611
APR-11-2002 07:50 FROM:
,.~
r"1
.a:83-9205439
,c._""
P.001/012
Beach Environmental. LLC
7lS W. Main
S....;104
Mpen. CO 81611
~.I (910) 925-3475
fCIX 925--4754
LETTER OF TRANSMITtAL
TO: Fred Jarman
City of Aspen - Comm Dev
130 S. Galena StTeet
Aspen, CO 81611
FAX...
q2/)- ~4 3'7
FM: Gary Beach
RE: Joy Streambank Stabilization
DATE: Aprill!, 2002
~b,; tb<e 1<:> -rH1!! INFO You Y'i u.e:,,j..,J
'j;' ~1nU a... G,1le ()~ <;'t.Y' \LIW,- o~. ~ ~
'$\-k.. ~e,,>-brd~ ~ ~ Ii\of<~....ik Ci.vu ux. M(
~ ~ 111~-,t- \~ - We. sWeJ '& ~l~-k
wH~ fu ~~ WQ1.l ~ 2.-5 J~., Sd ~
~ tills wlL~ ~_
1,
Please call 925.3475 with any questions about this transmittal.
Beach
715 West Main Street
Suite 304
Aspen, Colorado
970.925.3475
APR-11-2002 07:50 FROM:
".....,
~:83-9205439
P.002/012
To: Fll..E
PM: KKM
Date: 2/02
Re: Joy Streambank
I spoke with Steve Ellspermann and asked if we needed to seeure any tree removing permirs. if in
case we rhought we would have to. He said thar so long as the tree is under 6 inches in diameter
all we had to do was call him a couple of weeks in advance and have him view the property and
mark the tree. As it tums OUl. I do not think that any trees will need to be removed.
0269 -"Ole.doc
o
~:83-921215439
Q
P.12I1213/0l2
RPR-11-21211212 1217:5121 FROM:
,.,......,
o;?,ifi
R1iPI.VTO
^TTIf'l"ON OF
DEPARTMENT OF THE ARMY
u.s. ARMY ENGINEER DiSTRICT, SACRAMENTO
CORPS OF ENGINEERS
1'125 J STREe'l"
SACRAMENTO. CAUFORNIA 95814-2922
February 25, 2002
Regulatory Br~nch (200175496)
Mr. william and Sara Joy
u50 River Drive
Aspen, Colorado 81611
Dear Mr. and Mrs. Joy:
We have ex.tended the.coll.~tructir:.::tl.l?eriodund.er grandfather
_ -":prOvts'j,ons'~ -e~p~rd*'9-n~..-i.de:,'De,pa.,:r::meri.t..: .~L th~_~.llJY~ p~.:.;:mi t
number 200175496 to February 11, 2003. All other conditions of .
the permit remain in full force and effect.
""'!_ n-----
If yoU h~ve any questions, please write to Mr. Mark
Gilfillan, colorado/Gunnison Basin Regulatory Office, 402 Rood
Avenue, RoolTl 142, or telephone (970) 243-1199, extension 15.
Sincerely,
Ken Jacobson
Chief, Colorado/Gunnison Basin
RegulatOry Office
402 Rood Avenue, Room 142
Grand Junctiotl, colorado 61501-2563
Copies Furnished:
._. /Mr. Gary Beach, Beach Resource Management, LLC, 715 West Main
. .--V-...:.-stre-et-;-.-S"'...-t.....aO.4,. ASr;len,__.Colo.J::acl9 81611
Pitkin County, 506 East Main Street,' Asperi,-.Coloracro--S.:r6'IT-"-----.-
RPR-11-2002 07:50 FROM:
.tI'""'\
TO: 83-9205439
f1
P.006/012
INTEROFFICE MEMORANDUM
TO:
FROM,
SUBJBC1:,
DATE:
CC:
GLB
llT.P
JOY I'T.OOiJPI.AIN REPORT
OC'l'OllER 22, 21K)1
Gary"
Nick Adell. City Engineer, called tills .fternoon to ;nfoIil'lllS that the ~eccntly submitted r<Fort
on the Joy Floodplain satisfies all his concerns, According to his dirCoetiOll the next step would be to
notify the COE of our intctltiOfl of work. Thc City will then verify compliance when the work has
beeD completed.
02f,?Meh floWpliUn ~pon8C.I0-.22_01.dol;:
RPR-11-2002 07:50 FROM:
(\,
TO: 83-9205439
~
The AspeMnslitUle
Aspen Meadows
P.007/012
--
_.. J
~
Z
RPR-11-2002 07:51 FROM:
Beach
,.~
~
TO: 83-9205439
t""'\
;}
0.
~
ori~,~"-I Wl-IM'(.d
lol-z./o(
01-""
P.008/012
o
4.
Resource Management. I..I..C
'f1~ W MaIn
Suite 304
A:opl:::I,.C.U81611
T~ (970) 92S-347S
F"x ()1'i 47'54
Nick Adeh
City Engineer
City of Aspen
130 South Galena St
Aspen, CO 81611
Re: Joy Streambank. Stabilization Project Aspen, CO
Dear Nick:
At your request we have undertaken and completed a flood profile analysis of the
Roaring Fork River at tho William and Sara Joy property near the northwest city limits
of Aspen, Colorado. The Roaring Fork River along the Joy property was surveyed by
High Country Engineering on September 17, 2001 and cross. sections developed
through the survey were used in a HEC-RAS computer model to deteOTline the changes
in flood elevation that would result from the proposed streambank stabilization of the
loft bank of the Roaring Fork River adjacent to the Joy prOperty.
To paraphrase the conclu~ons of this study and report, the proposed placement of 90
cubic yards of material a1cmg this bankwill hnvean almost imperceptible effect on the
stream's water surface eley~tion. In fact, in ortler to produce a measurable result it was
necessary to calculate the surface water elevation change on a ten-year event. It is the
engineer's opinion therefore that the results of this study iric.Ucate the addman of 90
cubic yards of flU through this reach of theri ver willhaveanrnconscqucntliilliiipaet
and is likely to be sim.i1ar to the Impact Created by such natural phenomena as waves
and floating debris.
Therefore, we believe that the City of Aspen can now move forward with the issuance
of a pennit to allow the stream hank stabilization project to proceed. Should you have
any questions regarding the REC study please feel free to give me a call.
Sincerely,
wI attachment
Cc: S. Broderick
0269 1..lreauw:wlutabilizolWn. 100lO I
;,Ii
APR-11-2002 07:51 FROM:
f",.
6
TO: 83-9205439
t""""
'0:)
P.009/012
Subject:
Date: Man, 30 Apr200116:02:09 .0600
From: Richard Goulding <rlchardg@cLaspen.co.us>
To: jorine@bcachresource,com
Jorine,
Attach~d is the official response of the Engineering P~partm~nt in
relation to cne proposed Bank SCabiliz~tion. Sorry about the delay getting
this to you today but I wanted to talk to the Army Corps. of Engineers
first. t was informed that n~w regional conditions have recQntly been put
ia place ,eor more &ensitive.: ri.vcrs such as the Roa.ring Fork, also tha:y
would like to be informed of ~uch projects 6n the Roaring Fork even though
it falls within the 500ft limit. If you have further questions please
contact me at 970 920 5087 or richardg~ci.aspen.co.us ,
Richard Goulding
I_.,__..,,",~
, Name: ]oybankstablisation.doe
DJoybankstablisation.doc Type: WINWORD File (application/msword)
Encoding: base64
,
... maV{ h.ctve. (l<:,~ Y<=3IOYlq I ~r+\liY'l'S
.
l(\D~ro...e, R. v:: 12.IWY, 30 {d n1e~
~~a...,.J .d..:, I.) Q. V'I.+'\'" '=.. ""'" +,'{\~ ~
K\lG.(,. Gt~" ~\JJf...:ll:
~', ~;-k \-oc.~ .m..~_
1 of!
413010.) 5:4'> PM
..
APR-11-2002 07:51 FROM:
f""'\,
o
.",
TO: 83-9205439
t"'\
'0
P.010/012
DRe Joy Slope Stabilization Memo
Ref: 1250 Riverside Drive, Aspen
Date: April 30,2001
The submittal need to include a report by a licensed professional engineCl'registered
in the state of Colorado with experience in the field of river hydrology/ channel
stabilization. The submittal must include the following professional level work:
1) Completion of a survey of the cross sectioning of the existing and proposed river
channel
2) Performing a HEC- 2 run/analysis to ensure to ensure no rise or spread of flood flows
beyond floodplain boundaries established by FEMA in the June 1973 Publication.
3) Meet the regional conditions from the Army COIp. of Engineers and inform them of
the project if a Nationwide Pemlit#13 Bank Stabilization is to be used.
We are asking for the above so as to avoid any damage to up, down stream or adjacent
properties and to safeguard against future related problems.
o
TO: 83-9205439
ra
P. 011 /012
APR-11-2002 07:52 FROM:
^
~~
Beach Environmental. LLC
Steven EL~perman
City Of Aspen
130 S. Galena
Aspen, CoJot'~do 81611
April 6, 200t
Dcal Steven ElspCLman,
JOY STREAMBANK STABIliZATION
As you rcqucsted, 1 am submitti.ng the site plan and report for the JoY stteambank
stabilization project. We are requesting for an exemption flom the stream margin revic::w
plOcesS. Please revkw and advise. Feel fj:cc to cill with any questions or if additional
information is needed.
SineCLe1y,
~--;r
]orinc Lawyer
environmental Scientist
71~W.~1l
Sulft' }04
Aspcn,C081611
Tel (970) 925--3475
~',))( 92$-4754
.
o
TO: 83-9205439
n
o
,
P.012/012
APR-11-2002 07:52 FROM:
r--.
~~
ae.,ch Environmental. LLC
DATE: 3/26/01
ce,
FROM:
RE:
NlCKlJ'..lJ\CK. C'fJYPIJ\NNF.R
GAIlY I:lt:A.Ct1, TAItt. MCC\.lWAN
]ORINn I.AWYER
JOY ~;TIU::AMllANl< STAIlIUZATION
~to:
r have a([ached this memo .. a supplement [0 our report to highlight the Joy Srreambank
Stabilizatioa project on the Roaring Fork River. Plea,e view our ,ite pl.n as . supplement to this
memo.
The Joy's pleseady own two propemes .dj.eent to the Roaring Fork River on 1150 River Drive
in the Gty of A,pen. Cur<elltly the stl'ellmbank lllong their prope'ty is protee,ed by a long wckw-.ill,
boulders, and felled tree,. '1'hi, protection has o.ged, and d,e hydr.ulie force, of tho rivcr arc eroding
the';" property. Beach Environmentol WAS 'erained by the Joys to construct .n cnvironment:llly
sensitive design that would both stabilize the banks while ""hancing habitat and s",eam .esthetics.
Ou, designs incorpomte bioengineering, which uses narive pl.nr roaterials above the high w.= line
fOI st"J.biliz2tiOn. Below rhehigh water line) we will be using.stone-r.oe pmtccrioll. 'This is similar to
what is presently on-site, but We!: will use a geotextilc mctlh behind the stone to limit erosiOtl oC silt
and other fine material Coir logs, and bouldcr clusters are also part of our protection design_
Details of e<lch of these techniques c..n be found in figures 3-6.
This projcct is ,moll in ,cole; approximately 30() fect of streambank arc sited for ,tabili:.atioll.
We have aL:cady been approved for a Nationwide 'Permit No. H from the Army Corp' of Enjl;ineeJ:s
for this project and m.eet all of lheir gene~l and specifk conditions. See attached .report for details.
Weare asl;ing the Gty of Aspen for two thing~;
1) Approval ,or lhe ptoject as is. What is the p.rOcess and wnefr.me for approval? What
additional information i. required?
2) What pomon. of our pwposal need to be removed, if any, if we wnuld like tn expedite thc
process and qualify for an exemption?
0269:n.03
11) Vv fI.'L....ln
~\fil<; ~ln..l
1
'\~''''''I).(''U~ll.Ill
Tel (C)10) <'n:S--3415
r.t)!: 9"", 47....~
~,
n
MEMORANDUM
To: Fred Jarman, Planner
From: Richard Goulding, Project Engineer
Date: May 25, 2001
Re: Joy Stream Meeting
Attendance: Nick Adeh, Fred Jarman, Gary Beach, Richard Goulding
On Thursday, May 24, 2001 Gary Beach met with the City Engineer, Nick Adeh to
discuss the requirements for stabilizing the Joy stream bank. The following conditions
are to be met to ensure approval from the engineering department:
1) Completion of a survey of the cross sectioning of the existing and proposed river
channel, using 3 sections and is to be stamped by a licensed surveyor in the state of
Colorado
2) A letter from a professional engineer registered in Colorado stating that no upstream
or downstream degradation will result from the proposed development
3) AJeHel 110m WilKe Cloffy at th" Armv Core of Engineers approving the work