HomeMy WebLinkAbout3.0 BOCC Staff Report 04.07.1997REQUEST:
BOCC 4/7/97
PROJECT INFORMATION AND STAFF COMMENTS
Floodplain Special Use Permit for the
excavation and placement of fill within the
floodplain of the Colorado River/Helmer
Gulch.
APPLICANT: Allenman, Nicholas, Campbell L.L.C.
LOCATION: A tract of land located in portions of Sections
17, 19 and 20, T6S, R93W of the 6th P.M.;
south of Interstate 70 and north of the Rifle
Village South subdivision, approximately one
(1) mile -est of Rifle.
SITE DATA: 79.0 Acres +/-
WATER: N. A.
SEWER: N. A.
ACCESS: Access to County Road 320, through the Rifle
Village South subdivision
EXISTING ZONING: A/I
I. RELATIONSHIP TO THE COMPREHENSIVE PLAN
The subject tract is located in District F - Floodplain/Severe Environmental Constraints as
designated by the Garfield County Comprehensive Plan's Management Districts Map (1981).
II. DESCRIPTION OF THE PROPOSAL
A. Site Description: This 79.0 acre tract is located south of Interstate 70 , immediately
north of the Rifle Village South subdivision. The majority of the tract is reasonably
level and fully contained within the 100 -year floodplain of the Colorado River,
except for some steeper hillsides on the south portion of the property adjacent to the
subdivision. It appears the primary type of vegetation on the tract is various grasses,
with a few cottonwoods and some wetland areas located on portions of the tract See
vicinity map, page S .
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B. Development Proposal: The applicant is requesting the issuance of a Floodplain
Special Use Permit to allow the excavation of river gravels and the placement of fill
within the 100 -year floodplain of the Colorado River. The applicants propose to
excavate an area of approximately three (3) acres at the west end of an existing lake
and use the material taken out to use as fill for some proposed additional recreational
facilities. The excavation will be 6 to 8 feet deep and will result in the extension of
the existing lake 450 feet. The proposed lodge will be built at least two feet above
the existing ground level to meet the minimum requirements for the placement of a
structure in the floodplain fringe. See sketch map and application, pages `-' .
III. MAJOR ISSUES AND CONCERNS
A. Floodplain: The site of the proposed operation is within the regulated floodplain of
the Helmer Gulch, which is tributary to the Colorado River. Section 6.00 of the
Garfield County Zoning Resolution requires an approved Special Use Permit for any
development within a regulated floodplain. The purpose of the Special Use Permit
review is to assure compliance with various applicable county, state and federal
regulations as well as reviewing relevant technical issues.
The floodplain in this area has been mapped as a Special Flood Hazard Area. See
the floodplain map, page '/0 • . These are areas of shallow flooding to a depth
between 1.0 and 3.0 feet or areas of 100 year alluvial fan flooding. The Helmer
Gulch area appears to be an area of alluvial fan flooding.
B. Requirements of Section 6.08: The purpose of staff review under the Floodplain
Regulations and the necessity of issuing a Special Use Permit include the following
criteria:
1. To assure that all necessary permits have been received from those
governmental agencies from which approval is required by federal or state
law;
To determine whether the proposed building sites will be reasonably safe
from flooding, and that the structure will be in compliance with the
applicable provisions for uses and standards for construction set forth in the
Zoning Resolution, specifically provisions of Section 6.09.01;
3. To determine if the proposed development is located in the floodway;
4. To assure that adjacent communities, the Colorado Water Conservation
Board and the Federal Emergency Management Agency have been notified
of the proposed watercourse alteration or relocation;
5. To assure that the carrying capacity of the altered/relocated watercourse is
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5. To assure that the carrying capacity of the altered/relocated watercourse is
maintained.
Consistent with these requirements, the applicant has submitted the following
information:
a) The applicants have consulted with the Army Corps of Engineers (ACE) to
determine the boundaries of nearby or affected wetlands and is essentially
avoiding the wetland areas. The Corps of Engineers has authorized the
proposed dredging under a nationwide permit and require a certification of
the work once the work is completed. See permit, pages 11 •
b) At this time, a building site is identified on the proposed fill. The application
is to allow the excavation and fill of an area that, presumably, would later be
developed. If a Colorado professional engineer provides certification that this
area is totally elevated above the 100 -year floodplain, then no future
Floodplain Special Use Permit would be required for the proposed lodgex
c) The floodplain analysis concluded that the proposal would only affect the
lower portion of the Helmer Gulch floodplain and will not affect any down
stream property.
d) No watercourse relocation or alteration is proposed;
C. Related Issues: The City of Rifle has verbally advised staff that the proposed
relocation of a sewer line is being discussed. At the time of the staff report being
written there was no agreement in place to allow for the relocation of the line.
Without this agreement, the proposed fill cannot proceed forward. Staff recommends
a condition of approval require that the applicant's provide a copy of a letter or
agreement with the City of Rifle to relocate the sewer line.
IV. SUGGESTED FINDINGS
S
1. That proper publication and public notice was provided as required by law for the
hearing before the Board of County Commissioners.
2. That the hearing before the Board of County Commissioners was extensive and
complete, that all pertinent facts, matters and issues were submitted and that all
interested parties were heard at that hearing.
3. That the application is in compliance with the Garfield County Zoning Resolution
of 1978, as amended.
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4. For the above stated and other reasons, the proposed use is in the best interest of
the health, safety, morals, convenience, order, prosperity and welfare of the
citizens of Garfield County.
V. RECOMMENDATION
The proposed floodplain permit is technically separate from the proposed resort Special Use
permit and is also a technical exercise done by a hydraulic engineer. Staff recommends
APPROVAL of the Floodplain Special Use Permit, pursuant to the following conditions:
1. That all representations of the applicant, either within the application or stated before
the Board of County Commissioners, shall be considered conditions of approval.
2. The Special Use Permit shall be issued when all conditions of approval are met and
shall expire 360 days after issuance, unless the operation has commenced.
3. That all construction be in accordance with the engineering specifications and
comply with the provisions of the Army Corps of Engineers nationwide permits for
this type of floodplain/wetland development.
4. That an engineer design the foundation for the proposed lodge to insure that it meets
the floodplain regulations and that an "as -built" elevation certificate be provided to
the Building Department prior to the issuance of a certificate of occupancy.
5. That no material will be transported off of the site and sold commercially to any
other entity. % l
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P.O. Box 1908
1005 Cooper Ave.
Glenwood Springs,
CO 81602
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Z4NC4NELL4 4ND 4S5OCI4TE5, INC.
ENGINEERING CONSULTANTS
February 19, 1997
Mr. Mark Bean
Garfield County Planning Department
109 Eighth Street
Glenwood Springs, CO 81601
RE: #95223 Lake Toueye - Lake Expansion Flood Plain Analysis
Dear Mark:
(970) 945-5700
(970) 945-1253 Fax
This letter has been prepared to discuss the effects to the flood plain from proposed
construction activities and improvements related to the enlargement of Lake Toueye and
the relocation of an existing sewer line. Lake Toueye (formerly known' as Anderson Pond)
is located in Garfield County, Sections 17 & 20, Township 6 South, Range 93 West of the
6th P.M. The approximate location of the lake is shown on the attached General Location
Map Figure 1. The lake is Generally located southwest of the City of Rifle, is bordered on
the north by Interstate 70, and on the south by the Rifle Village South subdivision. Lake
Toueye is the result of gravel mining excavation activities and is below the original around
surface on the property. The lake has been utilized for water skiing activities over the last
several years.
The proposed expansion of the lake involves increasing the surface area by approximately
3 acres to improve water skiing accessability. The expansion of the ski lake will involve
excavation below the existing ground surface to a maximum depth of between 6 to 8 feet.
The future development of the property could also include the construction of a dub house
facility, boat docks, and skier facilities on the northern shoreline. The proposed expansion
of the lake and the development of the water ski facility is shown on the attached Sheet
No. 1.
Review of the flood insurance rate map for Garfield County Panel No. 0802051353-B (see
attached map) indicates that the area for the proposed lake expansion is within the
designated 100 year flood plain. The proposed areas of activity are within -Zone AO which
is classified as having a water depth of one foot (above existing ground surface elevations)
s
Page 1
Attachment F
or.7—
and a velocity of four feet per second. We believe this area is classified as "floodway
fringe" and not floodway. Review of the mapping indicates the floodplain is a result of
bank overtopping of Helmer Gulch. Some shallow flooding from the Colorado River is, also
possible.
The analysis for Helmer Gulch in the Flood Insurance Study did not involve standard
hydraulic modeling efforts, but rather was analyzed based on alluvial fan flooding
techniques applied to the area below the mouth of the canyon at Rifle Village South. We
believe the large blanket coverage of Area AO in the mapping was conservatively
overestimated. This includes areas in the Rifle Village South development. Nonetheless,
the proposed improvements at the lake must not increase flood levels to both upstream
and downstream properties. Due to the nature of the improvements at the lake, the
proposed activities will not increase any backwater conditions that will affect upgradient
landowners.
We believe excavation for the new lake area would provide additional detention storage
capability above the normal water line and therefore improve existing flood plain
conditions. Excavated material from the lake will either be hauled from the site, deposited
in the deeper portions of the existing lake, or be placed as fill on the property. Material
placed in the lake or hauled from the site will have no effect on the flood plain
characteristics. Material placed on site could potentially increase water levels locally at
the site but should not increase the timing or magnitude of flows to downstream locations.
It is our opinion that other than local effects to the site the proposed activities do not
present any increased flooding hazards to downstream locations.
To protect on site improvements at the lake we recommend that the club house facility
have the lowest floor elevation be constructed a.minimum of two feet above the existing
ground elevation. This elevation for the proposed clubhouse would be approximately
5274' which would also place the structure above the adjacent Colorado River 100 -year
flood elevation of 5272' which was extrapolated to the property from the flood insurance
maps.
Page 2
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If you have any questions, please call our office at (970) 945-5700.
Very truly yours,
Zancane!!a :._ociates Inc.
Christophefr Manera, P.E.
Thomas A. Zancanella, P.E.
President
W/encl
cc: Mr. Lee Alleman
Mr. Steve Campbell
Mr. Ron Liston
Ms. Sherry Caloia
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'TAILED
iTUDY
ZONE C
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DETAILED
STUDY
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GARFIELD
REPLY TO
ATTENTION OF
Regulatory
DEPARTMENT OF THE ARMY
U.S. ARMY ENGINEER DISTRICT, SACRAMENTO
CORPS OF ENGINEERS
1325 J STREET
SACRAMENTO, CALIFORNIA 95814-2922
March 3, 1997
Branch (199775057)
Mr. Thomas Zancanella
Zancanella and Associates,
Post Office Box 1908
1005 Cooper Avenue
Glenwood+ Springs, Colorado
Dear Mr. Zancanella:
Incorporated
81602
We have reviewed your plan for expanding Lake Toueye and
stabilizing a bankline segment of the lake. The project site is
located in Sections 17 and 20, Township 6 South, Rake 93 West,
Garfield County-, Colorado.
This project will have r____... al i ndividual and cumulative
effects on the acl.atic environment. We have also made a "no
effects" determination on en_anaered species.
The Coros of 3.naineers, Sacramento to District, has issued
Reaional General Peri_ Number G_`_ to authorize certain limited
discharges cf dr_yed material associated with minor excavation
projects. Based oncur review of the information submitted, the
Pxo vation aspect (less than 250 c.-bic yards) cf the project is
aut_h_crized bv this re icna- subject to the enclosed Permit
conditions. All of the dr_y material, excluding the amount
fc-`'he bank stabil_zationwork will be placed in an utiand
di ocsal site .
The Chief cf Engineers has also issued nationwide ceneral
permit number 13 for bank _ _ab____a_ion. Your limted bank
stabilization project (less than520 __=t and less than an
av=raae of one cubic vard _ _ unn_ng foot) can be const-rI-:cted
under this authority provided the work meets the enclosed terns
and conditions cf the permit. We _rote that you will be s:.riaaing
willow cuttings a! one the reconstructed bankline ne to create a
-re -rated shoreline and to promote added stability.
s• ned certification,.. -
letter for this purpose.
These aut._oi_zat_cns will be valid until March 3, 1999. We
assi, lei number 1997 1535/ to your Project. Please defer to this
number in any correscondence with :his office. If your plan co
wcr.m xtends beyond March =, 1999, you must contact this office
you will submit
office. I am enclosing a blank
a
form
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to receive an extension. If you have any questions concerning
these authorizations, please contact me at (970) 243-1199,
extension 11.
cerely,
Vv`
Mc ure
ef, orthwestern Colorado
Regul tory Office
4 _ :.od Avenue, Room 142
Junction, Colorado 81501-2563
Grand
Enclosures
Copies Furnished:
Mr. Bill Clark, Colorado Division of Wildlife, 711 Independent
Avenue, Grand Junction, Colorado 81501
Ms. Sarah Fowler, U.S. Environmental Protection Agency,
BEPR-EP, 999 18th Street, Suite 500, Denver, Colorado
80202-2466
?:r. Rick Kruecer, U.S. Fish and Wildlife Service, 764 Horizon
Drive, South Annex A, Grand Junction, Colorado 81506-3946
Mr. Mark Sean, Garfield County, 109 8th Street, Suite 303,
Glenwood Scrincs, Colorado 81601
iA ,
P.O. Box 1908
1005 Cooper Ave.
lenwood Springs,
CO 81602
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Z4r CANELL4 SND 455OC14TE5,
ENGINEERING CONSULT/1NT5
February 17, 1997
Ms. Susan Nall
Department of the Army
Northwestern Colorado Regulatory Office
402 Rood Avenue, Room 142
Grand Junction, CO 81501-2563
Re: Lake Toueye 199575420
Dear Ms. Nall:
f�
(970) 945-5700
(970) 945-1253 Fax
In accordance with the Grady McNure letter dated January 23, 1997, Zancanella and
Associates, Inc., is requesting that a Regional General Permit Number GP -045 or Nation
Wide Permit #13 be issued for the work proposed at Lake Toueye in Rifle, Colorado. The
permit applicants would be:
1. Applicant and Owner:
Alleman, Nicholas, Campbell, L.L.C.
P.O. Box 1 103
Minturn, CO 81645
2. The proposed work would be to enlarge the existing Lake Toueye by approximately
3.0 surface acres. Tne material to be excavated is comprised mostly of pit run
crave! 6 inches to 18 inches in diameter. We estimate that there will be
approximately 9" cf top soil or approximately 3,600 yards. In addition, there will
also be approximately 17;000 yards of pit run gravel material. The material will be
excavated from the area shown on the attached map and will be deposited on the
upland areas desicna:ed for fill. (See Figure 1)
The Lake Toueye Ski Club would also like to place some of the fill along the bank
of the existing lake to flatten the slope cf the lake bottom and improve bank
stabilization. This lake was originally constructed as a gravel mine. The existing
lake banks are steep and slough into the lake on a regular basis. This prevents the
establishment of vegetation which would provide wetland type habitat. We believe
this till could be authorized under a Nation Wide Permit #13. If this is not possible,
then we are prepared to place the material excavated from the proposed lake
expansion in the upland areas shown in Figure 1.
Page 1
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Attachment I
The proposed lake expansion will divert water from groundwater sources for
evaporation. An augmentation plan approved by the Division 5 water court in Case
95CW147 has been obtained to replace these evaporative losses. The evaporative
losses are estimated to be as
Month Net Evaporation
(Acre feet)
Jan. 0.058
Feb. 0.135
Mar. 0.504
Apr. 0.920
May 1.275
Jun. 1.641
Jul. 1.630
Aua. 1.219
Sept. 0.936
Oct. 0.467
Nov. 0.167
Dec. 0.048
Total: 9.0 AF
3. The proposed Lake Toueye is located approximately centered on the Section line
between Section 17 and 20, Township 6 South, Range 93 West of the 6' P.M. (see
attached location mac - Ficure 2)
4. The name and address and telephone numbers of the adjacent landowners are
attached in Table 1.
The plan (Figure 1) and typic=1 crmss section (Figure 3 ) for the proposed work are
also attached.
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Thank you for your assistance. If you have any questions, please contact our office at
(970) 945-5700.
Very truly yours,
Zancanella and Associates, Inc.
I In .A -A.
Thomas A. Zancanella, P.E.
President
cc: w/enc!
Lee Alleman
Steve Campbell
Sherry Caloia
Ron Liston
colodeotitr
Page 3
