HomeMy WebLinkAboutDrainage Reports - 02/01/1994W
116
Final ROPOO
zi 1154--
PRELIMINARY/FINAL
AND EROSION CONTROL STUDY
KENNY ROGERS ROASTERS
FORT COLLINS, COLORADO
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PRELIMINARY/FINAL
DRAINAGE AND EROSION CONTROL STUDY
FOR
KENNY ROGERS ROASTERS
FORT COLLINS, COLORADO
January 12, 1994
Prepared for:
Client:
Curtis Zook
Kenny Rogers Roasters
11091 North Wolff Way
Westminster, Colorado 80030
Prepared by:
RBD, Inc. Engineering Consultants
209 South Meldrum
Fort Collins, Colorado 80521
(303) 482-5922
RBD Job No. 563-002
%0INC.
Engineering Consultants
209 S. Meldrum
Fort Collins, Colorado 80521
303/482-5922
'
FAX: 303/482-6368
' January 12, 1994
' Mr. Glen Schleuter
City of Fort Collins
' Utility Services Stormwater
235 Mathews
Fort Collins, Colorado 80522
tRE: Preliminary/Final Drainage and Erosion Control Study for Kenny Rogers Roasters
' Dear Glen:
We are pleased to submit to you, for your review and approval, this Preliminary/Final
' Drainage and Erosion Control Study for Kenny Rogers Roasters. All computations within
this report have been completed in compliance with the City of Fort Collins Storm
Drainage Design Criteria. Please note that a change was made to the plan per our
' discussion on erosion control.
We appreciate your time and consideration in reviewing this submittal. Please call if you
have any questions.
Respectfully,
' BD Inc. Engineering Consultants
' Ter P. MCF�ar�y
tStan A. Myers, P.E.
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Other Offices: Denver 303/458-5526 • Vail 303/476-6340
TABLE OF. CONTENTS
DESCRIPTION PAGE
I. GENERAL LOCATION AND DESCRIPTION
A. LOCATION
B. DESCRIPTION OF PROPERTY
II. DRAINAGE BASINS
A. MAJOR BASIN DESCRIPTION
B. SUB -BASIN DESCRIPTION
DRAINAGE DESIGN CRITERIA
A. REGULATIONS
B. DEVELOPMENT CRITERIA REFERENCE AND CONSTRAINTS
C. HYDROLOGICAL CRITERIA
D. HYDRAULIC CRITERIA
E. VARIANCES FROM CRITERIA
IV. DRAINAGE FACILITY DESIGN
A. GENERAL CONCEPT
B. SPECIFIC DETAILS
V. STORM WATER QUALITY
A. GENERAL CONCEPT
B. SPECIFIC DETAILS
VI. EROSION CONTROL
A. GENERAL CONCEPT
VII. CONCLUSIONS
A. COMPLIANCE WITH STANDARDS
B. DRAINAGE CONCEPT
C. STORM WATER QUALITY
D. EROSION CONTROL CONCEPT
REFERENCES
APPENDIX A
VICINITY MAPS Al
HYDROLOGY A2
EROSION CONTROL
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1 PRELIMINARY/FINAL
DRAINAGE AND EROSION CONTROL STUDY
' FOR
KENNY ROGERS ROASTERS
FORT COLLINS, COLORADO
1 I. GENERAL LOCATION AND DESCRIPTION
1 A. Location
The proposed restaurant Kenney Rogers Roasters is to be located at the
southeast corner of East Monroe Avenue and South College Avenue in the
commercial shopping mall, 'The Square". The site is shown on a Vicinity
Map in the appendix. More particularly, the proposed development is
' located in the Southwest Quarter of Section 25, Township 7 North, Range
69 West of the Sixth P.M., Larimer County, Colorado.
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B. Description of Property
The site for Kenny Rogers Roasters contains approximately 0.63 acres of
area that is currently a part of the paved parking lot for the shopping mall
"The Square". The perimeter of the site is landscaped with turf grass, trees,
and shrubs. The property is bounded on the north by East Monroe
Avenue, on the west by South College Avenue, and on the east by an
entrance drive to the mall. A section of the existing paved parking lot along
the south side of the site will remain in place. The site generally slopes
downward from northwest to southeast at approximately 5 percent grade.
The Larimer County No.2 Canal crosses the northwest corner of the site.
DRAINAGE BASINS
A. Major Basin Description
The site is located in the Foothills Basin. This drainage area is shown on
a map in the Appendix taken from a Storm Water Management Model
(SWMM) study by Resource Consultants, Incorporated.
[I
B. Sub -Basin. Description
' Existing developed drainage patterns for the site are southeasterly. Runoff
flows offsite along the entrance drive on the west and south side of "The
Square'. Flows from "The Square" enter an offsite storm sewer on
John F. Kennedy Parkway that carries it to Warren Lake. Sub -basin 1
incorporates the entire site as well as some of the landscaping along the
' north and west sides of the site. This preliminary report addresses no other
off -site runoff.
' III. DRAINAGE DESIGN CRITERIA
' A. Regulations
All regulations as established by the City of Fort Collins Stormwater Utility
will be used for this preliminary drainage study.
B. Development Criteria Reference and Constraints
Drainage criteria are in accordance with the City of Fort Collins Storm
Drainage Design Criteria and Construction Manual. On -site detention is not
' required for the site. The impervious area of the site would decrease from
0.515 acres (existing) to 0.47 acres after the project is completed.
Therefore, existing off -site drainage patterns will not be adversely effected
at all. Flow patterns proposed for the site will remain nearly the same as for
the existing conditions. The only exception is that runoff from the north or
' west sides of the proposed building will be intercepted by the drive -through
lane which conveys it around the building.
C. Hydrological Criteria
The rational method was used to determine the peak runoff peak from the
site. The 10 and 100 year rainfall criteria, which was obtained from the City
of Fort Collins, is the criteria which was utilized for this study. The
calculations are included in the Appendix.
D. Hydraulic Criteria
' All calculations within this study have been prepared in accordance with the
City of Fort Collins Storm Drainage Criteria.
' 2
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' IV.
E. Variances from Criteria
A variance is requested from a required sediment/oil separator with the
trash enclosure. A structure like this is more applicable to a restaurant that
disposes of large amounts of oil from deep fat friers. Kenny Rogers
Roasters cooks using roasting ovens, thereby eliminating the need for
sediment/oil separator.
DRAINAGE FACILITY DESIGN
A. General Concept
As construction on the site progresses, the drainage and erosion control
concepts shown on the Preliminary Drainage and Erosion Control Plan, in
the back pocket of this report, should be followed.
B. Specific Details
If groundwater is encountered during construction, a Colorado Department
' of Health Construction Dewatering Permit will be required.
The site has adequate elevation relief to provide for surface drainage.
' Runoff will flow generally from the northwest corner of the site. It would flow
around the proposed building and across the parking lot to converge at the
southeast corner of the site (Design Point #1).
' V. STORM WATER QUALITY
A. GENERAL CONCEPT
Beginning in October of 1992, the water quality of storm water runoff was
required to be addressed on all final design utility plans. The Kenny Rogers
' Roasters development is anticipating construction beginning in 1994.
Therefore, for this study, we have sought to find various Best Management
Practices for the treatment of storm water runoff.
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' B. SPECIFIC DETAILS
' It is our understanding that, for this site, storm water quality should address
the prevention of contamination of runoff. This can be accomplished during
the daily operation of the restaurant itself. Since most of the site is paved
' parking, sediment control is not going to be a problem. But, the owner
should address operational procedures for pollution control and keeping the
area trash free.
VI. EROSION CONTROL
A. General Concept
' Kenny Rogers Roasters lies within the Moderate Rainfall Erodibility Zone
and the Moderate Wind Erodibility Zone according to the City of Fort
Collins zone maps. The City of Fort Collins Erosion Control Reference
' Manual for Construction Sites specifies that the erosion control performance
standard will need to be calculated and appropriate measures taken to
control erosion from the site. Erosion control features are shown on the
Preliminary/Final Drainage, Grading, and Erosion Control Plan. A sandbag
barrier will be the main erosion control measure used during construction.
to temporarily detain runoff to allow settling of sediment.
Gravel mulch was considered for use over a 4,000 square foot area as
erosion protection south of the proposed building. This area currently
' serves as parking for "The Square" shopping mall. Because of the
importance of getting this area back in service as quickly as possible, the
use of gravel mulch or other erosion protection would not provide the
' intended benefit. Therefore, a variance is requested from the city's criteria
by waiving the use of the gravel mulch. Instead, the sand bag barrier will
collect the extra sediment and the contractor will be required to closely
monitor the barrier and remove the sediment that collects. Since the
location of the sandbag barrier is partially off -site, it will be expedient for the
the project to minimize problems with "the Square" shopping mall and
repave the area as soon as possible. The erosion control performance
standard and efficiency for the site during construction assuming the gravel
' mulch is used are shown in calculations in the Appendix. If problems do
arise, the gravel mulch can be required at that time.
' All construction activities must also comply with the State of Colorado
permitting process for Stormwater Discharges Associated with Construction
Activity. A Colorado Department of Health NPDES Permit will be required
' before any construction grading can begin.
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CONCLUSIONS
A. Compliance with Standards
All computations within this report have been completed in compliance with
the City of Fort Collins Storm Drainage Design Criteria.
B. Drainage Concept
The drainage of stormwater runoff from the site will be less concentrated
after construction of Kenny Rogers Roasters than for the existing site
conditions. The previous drainage plan for 'The Square" adequately
handles the runoff for the existing site, therefore, no site detention nor
additional drainage structures are required. Flows in the irrigation canal will
remain the same as before the project is constructed.
If groundwater is encountered during the construction of any portion of the
site and dewatering is used to install utilities, then a State of Colorado
construction Dewatering Wastewater Discharge Permit will be required in
order for this water to be discharged into any waters of the United States.
C. Storm Water Quality
' Because storm water quality has become a requirement, the site will need
to address this storm water aspect. After construction, the owner of the
restaurant will have to be responsible for keeping the site clean so that
' runoff is not polluted.
D. Erosion Control Concept
' Appropriate erosion control measures and calculations of the overall
' performance standard for -the site have been completed according to the
City of Fort Collins Erosion Control Reference Manual for Construction
Sites.
' REFERENCES
' 1. Storm Drainage Design Criteria and Construction Standards, by the City of Fort
Collins, Colorado, May 1984, revised March 1991.
' 2. Erosion Control Reference Manual for Construction Sites, by the City of Fort
Collins, Colorado, January, 1991.
' 5
APPENDIX
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HYDROLOGY
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EROSION CONTROL
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RAINFALL PERFORMP.NCE STANDARD EVALUATION
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PROJECT: &,AvAJ7 STANDARD FORM A
COMPLETED BY: T,`n^ DATE: ll ti3
DEVELOPED
SUBBAgIN
ERODIBILITY
ZONE
Asb
(ac)
Lsb
(ft)
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($)
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($)
PS
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MARCH 1991
8-14
DESIGN CRITERIA
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EFFECTIVENESS CALCULATIONS
PROJECT: K�NrJy i2oCaC►2S �oAST 25 STANDARD FORM B
COMPLETED BY: DATE: 11 $'
Erosion Control' C-Factor P-Factor
Method Value Value Comment
Gjov G-►aq� 0. 01 1.00 �x15Tinl(y T�LrF (tJr sic�s,
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(Ac)
CALCULATIONS
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MARCH 1991
DESIGN CRITERIA
' CONSTRUCTION SEQUENCE
' ^ROJECT: 904617nS STANDARD FORM C
SEQUENCE FOR 19,'Id ONLY COMPLETED BY: �PM DATE: IIAZ
' Indicate by use of a bar line or symbols when erosion control measures will be installed.
Major modifications to an approved schedule may require submitting a new schedule for
' approval by the City Engineer.
YEAR
MONTH I ►•1 I tJ I F I M I I M I J I .1 I A-, 1 j
OVERLOT GRADING -
WIND EROSION CONTROL
-.Soil. Roughening_.__.._.
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other
k.INFALL EROSION CONTROL
' STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers
' Silt Fence Barriers
_Sand_Bags
Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Con.crete Paving
Other -
VEGETATIVE:
Permanent Seed Planting
Fulching/Sealant
Temporary Seed. Planting
' sod Installation
Nettings/Hats/Blankets
Other
STRUCTURES: INSTALLED BY
IGETATION/Y.ULCHING CONTRACTOR
ITE SUBMITTED
1
Y.AINTAINED BY
APPROVED BY CITY OF FORT COLLINS ON
' MARCH 1991
8-16
DESIGN CRITERIA
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' MA.ACH 1991 8.4 DESIGN CRITERIA
Table 813 C-Factors and P-Factors for Evaluating EFF Values.
'
Treatment C-Factor
P-Factor
BARE SOIL
Packedand smooth1.00
1.00
................................................................
Freshly disked . 1.00
0.90
Roughirregular surface ................................................ :.......... 1.00
0.90
'
SEDIMENT BASIN/TRAP.................................. ...................,.......... 1.00
0.50111
STRAW BALE BARRIER, GRAVEL FILTER,
SAND BAG
....................... . 1.00
0.80
SILT FENCE BARRIER..................................................................... 1.00
0.50
ASPHALT/CONCRETE PAVEMENT ........................................... :....... 0.01
1.00
'
ESTABLISHED DRY LAND (NATIVE) GRASS .......................... See Fig. 8-A
1.00
SODGRASS................................................................................. 0.01
1.00
TEMPORARY VEGETATION/COVER CROPS .................................... 0.45121
1.00
HYDRAULIC MULCH @ 2 TONS/ACRE0.10,21
1.00
SOILSEALANT....................................................................0.01-0.60"'
1.00
EROSION CONTROL MATS/BLANKETS............................................ 0.10
1.00
'
GRAVEL MULCH
Mulch shall consist of gravel having a diameter of approximately
114" to 1 1/2" and applied at a rate of at least 135 tons/acre.............. 0.05
1.00
'
HAY OR STRAW DRY MULCH
After olantino grass seed, apply mulch at a rate of 2 tons/acre (minimum) and adequately
anchor,
tack or crimp material into the soil.
'
Slope (%)
1 to 05.............................................................................0.06
1.00
6 to 10............................................ 0.06
.................................
11 to 15............................................................................. 0.07
1.00
1.00
16 to 20............................................................................. 0.11
1.00
21 to 25.............................................................................0.14
1.00
'
25 to 33.............................................................................0.17
> 33.......................................................................... 0.20
1.00
.1.00
NOTE: Use of other C-Factor or P-Factor u<lues reported in this table must be substantiated by documentation.
(1) Must be constructed as the first step in overlot grading.
(2) Assumes planting by dates identified in Table 11-4, thus dry or hydraulic mulches are
not required.
(3) Hydraulic mulches shall be used only between March 15 and May 15 unless irrigated.
'
(4) Value used must be substantiated by documentation.
MARCH 19S1 8-6
DESIGN CRITERIA
E. MONROE
BmLmrvc
_..__ 6 2784 d 27.84
3111' N S 3496.b- 2088.2% pill
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LARIMER (O. /2 REMOVE EAST. —A o a
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MATCH EXIST CAI SEE OETPIL
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EXISTIN3 CONTOURS, AS SHOWN, ARE APPROXIMATE ONLY
I .''E.rI Lo) IN cr _cT, 1,
All �0.l'..D.Ir..:
e. — — EROSION CONTROL REQUIREMENTS DF As r cT
I were OR 1 1
Irish
1he plain
or areas to as
q al .n The zbgPa Ranking shall
access v timed U to o see b the epoF e i n"V M1[aR�
Ll /_ t BSI M+.=
is long as possible
il
p
. 1 1 ] A 11 The a b O h II b g l t a t sediment acoasitz. 14A AC BPS F
1 et adjacent a 9^ e y < PRELIMINARY
1
1 _ thelelwe. re shall b take,t p thew aundng a 1 I wanner JANUARY to 1994
a'1 h1 mE t [ me Seeding and landscaping reWlements c e not covered within these p'ms.
PRO° ERT+ 9OI'.M1^AR+
INFLOW CURB & GUTTER OUTFALL CURB & GUTTER
y Engineering Consultants KENNY ROGERS PRELIMINARY/FINAL DRAINAGE,
DEC. n6=-rC: ROASTERS GRADING AND EROSION CONTROL PLAN 4 4
N0. By DATE REVISION DESCRIPTION