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FINAL DRAINAGE AND
EROSION CONTROL STUDY
FOR THE OAKRIDGE BUSINESS
PARK SEVENTEENTH FILING
FORT COLLINS, COLORADO
January 6, 1995
Prepared for:
Client:
Drahota Construction Company
1708 E. Lincoln Ave., J-4
P.O. Box 1488
Fort Collins, Colorado 80522
Prepared by:
RBD, Inc. Engineering Consultants
209 S. Meldrum
Fort Collins, Colorado 80521
(303) 482-5922
RBD Job No. 348-003
INC.
'
Engineering Consultants
209 S. Meldrum
Fort Collins, Colorado 80521
303/482-5922
'
FAX: 303/482-6368
1
'
January 6, 1995
Mr. Glen Schlueter
City of Fort Collins
'
Utility Services, Stormwater
235 Matthews
'
Fort Collins, Colorado 80522
RE: Final Drainage and Erosion Control Study
' for the Oakridge Business Park Seventeenth Filing
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Dear Glen:
We are submitting to you, for your review and approval, this revised Final Drainage
and Erosion Control Study for the Oakridge Business Park Seventeenth Filing. All
computations within this report have been completed in compliance with the City of
Fort Collins Storm Drainage Design Criteria. All comments from the Stormwater
Utility's reviews to this date have been addressed.
We are requesting a variance from the City of Fort Collins specifications within this
report, described on page 2 of the text. To briefly describe it, we are asking that the
city requirement of 2.0% for drainage swales be waived in this case as explained
within this report.
We appreciate your time and consideration in reviewing this submittal. Please call if
you have any questions.
Respectfully,
RBD Inc. Engineering Consultants
Perry E. Cabot
Project Engineer
Roger �. Curtiss, P.E.
Project Manager
27362
Denver3031458-5526
TABLE OF CONTENTS
DESCRIPTION
PAGE
I. GENERAL LOCATION AND DESCRIPTION
1
A. LOCATION
1
B. DESCRIPTION OF PROPERTY
1
II. DRAINAGE BASINS
1
A. MAJOR BASIN DESCRIPTION
1
III. DRAINAGE DESIGN CRITERIA
2
A. REGULATIONS
2
B. DEVELOPMENT CRITERIA REFERENCE AND CONSTRAINTS
2
C. HYDROLOGICAL CRITERIA
2
D. HYDRAULIC CRITERIA
2
E. VARIANCES FROM CRITERIA
2
IV. DRAINAGE FACILITY.DESIGN
2
A. GENERAL CONCEPT
2
V. EROSION CONTROL
3
A. GENERAL CONCEPT
3
VI. CONCLUSIONS
3
A. COMPLIANCE WITH STANDARDS
4
B. DRAINAGE CONCEPT
4
C. EROSION CONTROL CONCEPT
5
REFERENCES
6
APPENDIX
VICINITY MAP 2
SITE HYDROLOGY 5
DESIGN OF CHANNELS 10
INLET DESIGN 17
EROSION CONTROL 19
OFFSITE GRADING EASEMENT INFORMATION 25
CHARTS, FIGURES AND TABLES 28
'
FINAL DRAINAGE AND EROSION CONTROL STUDY
FOR THE OAKRIDGE BUSINESS PARK SEVENTEENTH FILING
FORT COLLINS, COLORADO
GENERAL LOCATION AND DESCRIPTION
A. Location
The Oakridge Business Park Seventeenth Filing is located within the
Oakridge Business Park and will be located adjacent to and .east of
Innovation Drive, south of the new ABB facility, north of the Simpson
'
Sheet Metal Site, and west of the Union Pacific Railroad Right-of-way.
The site can also be described as being located in the Northeast Quarter
of Section 6, Township 6 North, Range 68 West of the 6th P.M., City of
Fort Collins, County of Larimer, State of Colorado, containing
approximately 4.38 acres. A site location plan within a section of the
Oakridge Business Park is included in the appendix of this report.
B. Description of Property
This site is presently undeveloped. The property is being proposed to
contain four office -warehouse buildings, with accompanying gravel
'
surfaced storage yards, asphalt parking and access. Native grasses cover
the property presently. The topography of the site is generally from west
to east at less than 0.5%. The adjacent Innovation Drive and the water
'
and sanitary sewer are already constructed.
II. DRAINAGE BASINS
'
A. Major Basin Description
tThe proposed development lies entirely within Basin 200 of the Oakridge
Business Park Master Drainage Plan, as prepared by RBD Inc. Engineering
' Consultants dated June 22, 1990. Overall, it lies within the McClellands
Master Drainage Basin. An open channel, called Conveyance Element 20
(Oakridge Business Park Master Drainage Plan, page 3/31) currently runs
' from north to south along the easterly boundary of Basin 200, and
conveys flows from Basin 200 to the Regional Detention Pond #2 located
north of Keenland Drive and east of Oakridge Village 7" Filing, and west
of Union Pacific Railroad. Per the Master Drainage Study, developed
flows from Basin 200 will be free release and detained in the Regional
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Detention Pond #2. A copy of the routing schematic is included in the
appendix of this report. There is no on -site detention proposed with this
development.
III. DRAINAGE DESIGN CRITERIA
A. Regulations
The City of Fort Collins Storm Drainage Design Criteria is being used for
the subject site.
' B. Development Criteria Reference and Constraints
From the Master Drainage Plan, 10 year and 100 year developed flows
' from Basin 200 will be routed through an open channel to the existing
Regional Detention Pond #2 located north of Keenland Drive and east of
the Oakridge Village 7"' Filing Development and west of Union Pacific
Railroad. This regional pond has previously been designed to
accommodate developed runoff for Basin 200.
' C. Hydrological Criteria
The rational method for determining surface runoff was used for the
' project site. The 10 and 100 year storm event criteria, obtained by the
City of Fort Collins, was used in calculating runoff values. These
calculations and criteria are included in the appendix.
' D. Hydraulic Criteria
' All hydraulic calculations within this report have been prepared .in
accordance with the City of Fort Collins Drainage Criteria and are included
' in the appendix.
E. Variances from Criteria
' The Regional Conveyance Element 20, as it exists on the Oakridge
Business Park, 16`h Filing, was approved as constructed at 0.5% on April
19, 1993. We are asking that the extension of this channel onto the
'- Oakridge Business Park, 17' Filing also be allowed to be constructed at
the same 0.5%, thus waiving the City requirement for a trickle pan at
' slopes less than 2.0%. There are two reasons for this request. First,
there is no trickle pan or subdrain existing in any reach of this Regional
1 2
Element 20, despite its slope being less than 2.0 % at certain points, so
' constructing one just for this section would be rather impractical.
Secondly, after speaking with Robert Ross, the owner of the Simpson
Sheet Metal site, we were informed that the somewhat flat slope has had
' no ill effects on the drainage of his property during major storms since
he has owned and operated the building on that property.
IV. DRAINAGE FACILITY DESIGN
' A. General Conceot
All of this proposed development's stormwater will be undetained on -site
' runoff. The majority of it (Basins 2,3,4,5,6,8) (There is no Basin 7) will
flow easterly by a combination of overland flows, on -site channels and
by curb and gutter to an open channel along the east edge of the
' property, and flow south through an existing channel (Conveyance
Element 20) to the existing Regional Detention Pond #2, which was
previously sized for developed flows from this site.
' Included in the back pocket of this report are the proposed grading and
drainage plans for the subject property. The proposed driveway section
' onto Innovation Drive will have a high point approximately 100 feet east
of the Right -of Way line, so a portion of developed flows from this
site (Basin 1) will enter Innovation Drive and will be collected in two
downstream 8' sidewalk culverts and routed back into the property. This
runoff will flow into a swale,with a subdrain along the south property
line. Finally, it will be conveyed offsite by the Regional Conveyance
Element 20 running along the east portion of the . property. Street
capacities were checked regarding this runoff and found to be
' acceptable.
The peak flow rates used to size the existing downstream channel from
this site to the Regional Detention Pond #2 are from the Master Drainage
Plan, 100 year peak flow rate for Conveyance Element 20. The Regional
Channel section (Conveyance Element 20) will be extended during this
' development up the easterly edge of the Oakridge Business Park, 17'h
Filing to accommodate flows from the developed ABB site as well.
Currently, flow from the ABB site gutter flows out of the parking lot
through a curb opening at the southeast corner and into an existing
detention pond. This pond is to be filled in, and thus create the need for
the Regional Element to be extended to a point where the ABB flows can
' be channelized.
1 3
0
' A grading easement has been obtained which will allow for some
' regrading of a portion of land, about 0.7 acres, at the southern side of
the ABB property. This area already drains onto the Seventeenth Filing
property, so it will not be neccessary to alter it to facilitate proper
' drainage. All that is planned for this property is some earth removal, but
not enough to adversely affect drainage, as the grading plan describes.
' V. EROSION CONTROL
A. General Concept
This development lies with the Moderate Wind Erodibility Zone and the
' Moderate Rainfall Erodibility Zone per the City of Fort Collins zone maps.
The Erosion Control Performance Standard (PS) for the site .was
computed to be 74.7 % during construction and 87.9% after
' construction per the City of Fort Collins Erosion Control Reference
Manual for Construction Sites. The Effectiveness (EEF) of the proposed
erosion control plan was calculated to be 82.0% during construction and
' 97.9% after construction. Therefore, the erosion control plan as detailed
in the appendix and on the grading, drainage and erosion control plan
meets the -City of Fort Collins requirements.
' After the overlot grading has been completed, all disturbed areas, not
located within a building pad, sidewalk, or asphalted area shall have a
' temporary vegetation seed applied per the specifications shown on the
Grading, Drainage and Erosion Control Plan. After seeding, a hay or
straw mulch shall be applied over the seed at a rate of 2 tons per acre,
' minimum. The mulch shall be adequately anchored, tacked, or crimped
onto the soil per the methods shown on the .Grading, Drainage and
' Erosion Control Plan. After utilities have been installed, the parking areas
and gravel service areas shall have the basecourse or gravel mulch
applied at a rate of 135 tons per acre. Straw bales are to be placed at
' in the swales and channels as shown on the Grading, Drainage and
Erosion Control Plan. The bales in the swales are to be left in place until
the swales are sodded.
' This plan assumes that asphalt and gravel surfaces will be in place within
three months of overlot grading.
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' VI. CONCLUSIONS
A. Compliance with Standards
' All computations that have been completed within this report are in
compliance with the City of Fort Collins Erosion Control Reference
Manual and the Storm Drainage Design Criteria Manual. In addition, all
' computations and recommendations are in compliance with the Oakridge
Business Park Master Drainage Study.
' B. Drainage Concept
The proposed drainage concepts adequately provide for the transmission
of developed on -site runoff to the existing Regional Detention Pond #2
located north of Keenland Drive, east of Oakridge Village, 7' Filing, and
' west of Union Pacific Railroad. The proposed channel section will collect
the 100 year developed runoff generated by the Oakridge Business Park
17t' Filing, as well as the ABB site, and convey those flows to the
Regional Detention Pond #2.
C. Erosion Control Concept
The proposed erosion control concepts adequately provide for the control
of wind and rainfall erosion from the Oakridge Business Park, 17'h Filing
site. Through the construction of the proposed erosion control concepts,
the City of Fort Collins performance standard will be met. The proposed
erosion control concepts presented in this report and shown on the
' Grading, Drainage and Erosion Control plan are in compliance with the
City of Fort Collins Erosion Control Criteria.
[1
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REFERENCES
1. Storm Drainage Design Criteria and Construction Standards by the City of Fort .
Collins, Colorado, May 1984..
2. Erosion Control Reference Manual for Construction Sites by the City of Fort
Collins, Colorado, January 1991.
3. Master Drainage Study for the Oakridge Business Park, Fort Collins, Colorado,
by RBD, Inc. June 1990.
4. Oakridge Business Park, 16" Filing Drainage Report, March 1993.
M
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APPENDIX
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• i `'"::�-''HORSETOOTH ROAD:
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warren i 1 r' •��• COUNTY ROAD 40 N
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Trait Part.
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REGIONAL
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K.-:>` DETENTION �I
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at
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� VICINITY MAP
NO LE
DAD
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t)A1G¢.IDEq'E ,BUS I ASS PP.PaG
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OD.C.�IDFa'S P�uStIJESS Pt�'�.1C� j
I(oT= FtLtN(� �
LEGEND
--------
— MANHOLE
4�FLARED END SECTION
STORM DRAIN PIPE
SUB -BASIN LINE
-�
FLOW DIRECTION
3OO
BASIN DESIGNATION
BASIN AREA IN ACRES
L)
100YK COWVLYANCG ELEMENT
NOTES:
1. THE PIPE SIZES SHOWN ON THIS
PLAN WERE. TAKEN FROM DESIGN
PLANS.
230
320
23 Is 2
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poril
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ROUTING SCHEMATICS
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convayanc
Eloment
# 17
Leadin910
Ponds #
and #;
Pond 2
100 YEAR
STORM
Pond I
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SITE HYDROLOGY
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' COMPOSITE "c" VALUES (BY RATIONAL METHOD)
'PROJEC OAKRIDGE 17TH
PERFORMED BY: P. CABOT
c" VALUES
ROOFS
0.95
ASPHALT
0.95
GRASS
0.50
GRAVEL
0.20
AREAS
DEVEL.
BASIN
TOTAL
ROOFS
ASPHALT
GRASS
GRAVEL
& CONC.
1
0.31
0.00
0.31
0.00
0.00
0.95
2
0.76
0.25
0.04
0.47
0.00
0.67
3
0.88
0.17
0.71
0.00
0.00
0.95
4
0.49
0.07
0.00
0.32
0.10
0.50
5
0.82
0.00
0.45
0.27
0.10
0.71
6
1.58
0.33
0.18
0.74
0.33
0.58
8
0.70
0.21
0.00
0.49
0.00
0.64
' TOTAL 5.54 1.03 1.69 2.29 0.53
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DESIGN OF CHANNELS
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RBD INC. ENGINEERING CONSULTANTS
CHANNEL RATING INFORMATION
SECTION 'A' OAKRIDGE,17
STA
ELEV
0.00
20.00
20.00
15.00
40.00
20.00
'N' VALUE SLOPE (ft/ft)
-----------------------
0.035 0.0050
o = 22.07 LDS
_a too = 41.7-7 G-cS
QMx = 55.SS c.Fs
ELEVATION
AREA
VELOCITY
DISCHARGE
FROUDE
(feet)
.........
(sq ft)
-------
(fps)
--------
(efs)
---------
NO.
------
15.50
1.0
1.2
1.17
0.41
16.00
4.0
1.9
7.44
0.46
16.50
9.0
2.4
21.92
0.50
Q o @ S
17.00
16.0
3.0
47.20
0.52
17.50
25.0
3.4
85.57
0.54
18.00
36.0
3.9
139J3
0.56
18.50
49.0
4.3
209.84
0.57
19.00
64.0
4.7
299.57
0.58
19.50
81.0
5.1
410.09
0.59
20.00
100.0
5.4
543.08
0.61
0100 e I q
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RBD INC. ENGINEERING CONSULTANTS
CHANNEL RATING INFORMATION
SECTION S OAKRIDGE 17
STA. ELEV
0.00
20.00
20.00
15.00
21.00
15.00
41.00
20.00
N VALUE SLOPE (ft/ft)
---------- -------------
0.035 0.0050
ELEVATION
AREA
VELOCITY
DISCHARGE
FROUDE
(feet)
---------
(sq ft)
-------
(fps)
(cfs) -
NO.
------
15.50
1.5
1.3
1.99
0.43
16.00
5.0
2.0
9.99
0.47
16.50
10.5
2.6
26.91
0.50
17.00
18.0
3.1
55.23
0.53
17.50
27.5
3.5
97.18
0.54
18.00
39.0
4.0
154.83
0.56
18.50-
52.5
4.4
230.12
0.57
19.00
68.0
4.8
324.88
0.59
19.50
85.5
5.2
440.86
0.60
20.00
105.0
5.5
579.74
0.61
0.51
Q,u • I.Oq cxs
ca,�� 2.20 c<s
C;Z &&x - J . 03 cps
r
RBD INC. ENGINEERING CONSULTANTS
CHANNEL RATING INFORMATION
SECTION G OAKRIDGE 17
STA ELEV
0.DO
20.00
20.00
15.00
21.00
15.00
41.00
20.00
'NO VALUESLOPE (ft/ft) _
0.035 0.0050
C3� I = 4.( b GAS
Q,00 = 7.�•2 c�CS
Q . A.-v = I O , SO c,re
ELEVATION
AREA
VELOCITY
DISCHARGE
FROUDE
(feet)
(sq ft)
(fps)
--------
(cfs)
-----•---
NO.
-
------
Qio
O.7
15.50
1.5
1.3
1.99
0.43
16.00
5.0
2.0
9.99
0.47
O m L
O •�
16.50
10.5
2.6
26.91
0.50
17.00
18.0
3.1
55.23
0.53
Q HAK
1
17.50
27.5
3.5
97.18
0.54
18.00
39.0
4.0
154.83
0.56
18.50
52.5
4.4
230.12
0.57
19.00
68.0
4.8
324.88
0.59
19.50
85.5
5.2
440.86
0.60
20.00
105.0
5.5
579.74
0.61
ME
C.�:`
d
RBD INC. ENGINEERING CONSULTANTS
CHANNEL RATING INFORMATION
' SECTION D OAKRIDGE 17
' STA ELEV
0.00 20.00
20.00 15.00
' 21.00 15.00
41.00 20.D0
IN' VALUE- SLOPE (ft/ft)
' 0.035 0.0050
' ELEVATION AREA VELOCITY DISCHARGE FROUDE
(feet) (sq ft) (fps) (cfs) NO.
--------- ------- -------- --------- ------
15.50 1.5 1.3 1.99 0.43_
16.00 5.0 2.0 9.99 0.47_
16.50 10.5 2.6 26.91 0.50
' 17.00 18.0 3.1 55.23 0.53
17.50 27.5 3.5 97.18 0.54
18.00 39.0 4.0 154.83 0.56
18.50 52.5 4.4 230.12 0.57
' 19.00 68.0 4.8 324.88 0.59
19.50 85.5 5.2 440.86 0.60
20.00 105.0 5.5 579.74 0.61
'\ 1 .O,
P
a 10 = ✓.gig ck's
Q = I I .9 (:=) CF'S
G nAc-A = I3.9 1 c4g
Oro 'C �•b�
C3 you @ 1.0 ,
RBD INC. ENGINEERING CONSULTANTS
CHANNEL RATING INFORMATION
SECTION E OAKRIDGE 17
STA ELEV 2.2.0 C-'S
----- ......
0.00 20.00 CZZ M4x 0.�7�o GCS
20.00 15.00
21.00 15.00
41.00 20.00
IN' VALUESLOPE (ft/ft) -
0.035 0.0050
ELEVATION
AREA
VELOCITY
DISCHARGE
FROUDE
(feet)
---------
(sq ft)
-------
(fps)
........
(cfs)
-•----•--
NO.
------
C�i,o
15.50
1.5
1.3
1.99
0.43
16.00
5.0
2.0
9.99
0.47
O oo e'
O
16.50
10.5
2.6
26.91
0.50
O S
17.00
18.0
3.1
55.23
0.53
,
17.50
27.5
3.5
97.18
0.54
18.00
39.0
4.0
154.83
0.56
18.50
52.5
4.4
230.12
0.57
19.00
68.0
4.8
324.88
0.59
19.50
85.5
5.2
446.86
0.60
20.00
105.0
5.5
579.74
0.61
O ,&
O .-7
7. 41
1
1
1
1
RBD INC. ENGINEERING CONSULTANTS
CHANNEL RATING INFORMATION
SECTION F OAKRIDGE 17
STA IELEV
0.00
20.00
20.00
15.00
21.00
15.00
41.00
20.00
W VALUE SLOPE (ft/ft)
---------- .............
0.035 0.0050
0,0 = 4.25 C-Cs
( 0.03 C4's
c�'s
ELEVATION
AREA
VELOCITY
DISCHARGE
FROUDE
(feet)
-
(sq ft)
-------
(fps)
........
(cfs) _
NO.
------
15.50
1.5
1.3
1.99�-
16.00
5.0
2.0
9.99
0.4T
Q-co @ I. 0
16.50
10.5
2.6
26.91
0.50
17.00
18.0
3.1
55.23
0.53
C;Z"x
17.50
27.5
3.5
97.18
0.54
18.00
39.0
4.0
154.83
0.56
18.50
52.5
4.4
230.12
0.57
19.00
68.0
4.8
324.88
0.59
19.50
85.5
5.2
440.86
0.60
20.00
105.0
5.5
579.74
0.61
m
1
1
' INLET DESIGN
17
-------------------------------------- ----------------------------------------
' UDINLET: INLET HYDARULICS AND SIZING
DEVELOPED BY
DR. JAMES GUO, CIVIL ENG DEPT. U OF COLORADO AT DENVER
SUPPORTED BY METRO DENVER CITIES/COUNTIES AND UD&FCD
-------------------------------------------------------------------------
USER:KEVIN GINGERY-RDB INC FT. COLLINS COLORADO..............................
ON DATE 12-03-1994 AT TIME 15:24:23
*** PROJECT TITLE: INLET DESIGN
*** CURB OPENING INLET HYDRAULICS AND SIZING: -r rcME SWA..LL
' INLET ID NUMBER: 1
' INLET HYDRAULICS: ON A GRADE.
J1LL G1�PTUC 2,9 G� a
GIVEN INLET DESIGN INFORMATION: — —�—
GIVEN CURB OPENING LENGTH (ft)= 8000
REQUIRED CURB OPENING LENGTH (ft)= 19.43 --
IDEAL CURB OPENNING EFFICIENCY = 0.62-;t�P—fUL��
ACTURAL CURB OPENNING EFFICIENCY = 0.57 �.3 r,45,,
' STREET GEOMETRIES:
STREET LONGITUDINAL SLOPE ($) = 0.60
STREET CROSS SLOPE M = 2.00
' STREET MANNING N = 0.016
GUTTER DEPRESSION (inch)= 1.50
GUTTER WIDTH (ft) = 2.00
' STREET FLOW HYDRAULICS:
WATER SPREAD ON STREET (ft) = 13.94
' GUTTER FLOW DEPTH (ft) = 0.40
FLOW VELOCITY ON STREET (fps)= 2.50
FLOW CROSS SECTION AREA (sq ft)= 2.07
' GRATE CLOGGING FACTOR ($)= 50.00
CURB OPENNING CLOGGING FACTOR(%)= 10.00
INLET INTERCEPTION CAPACITY:
' IDEAL INTERCEPTION CAPACITY (cfs)= 3.20
BY FAA HEC-12 METHOD: DESIGN FLOW (cfs)= 5.20
FLOW INTERCEPTED (cfs)= 2.94
' CARRY-OVER FLOW (cfs)= 2.26
BY DENVER UDFCD METHOD: DESIGN FLOW (cfs)= 5.20
FLOW INTERCEPTED (cfs)= 2.88
CARRY-OVER FLOW (cfs)= 2.32
11
I
1
EROSION CONTROL
1,
1
19
1
RWINC.
'
Engineering Consultants
209 S. Meldrum
Fort Collins, Colorado 80521
303/482-5922
'
FAX:303/482-6368
October 25, 1994
'
Mr Glen Schlueter
City of Fort Collins
'
Utility Services Stormwater
235 Matthews
Fort Collins, CO .80522
' Re: Oakridge Business Park, Seventeenth Filing
Erosion Control Cost Estimate
' Dear Glen:
' This portion of the report is to satisfy the City of Fort Collins requirements for an
erosion control security deposit for the Oakridge.Business Park, Seventeenth Filing.
' The City of Fort Collins Current Cost Factors will be used in this estimate..
There will be approximately 5.33 acres disturbed within this project, including an
' offsite grading easement.
Using the city criteria of $650.00 per acre for sites less than 10 acres, and a 150%
' contingency, the total obligation of Drahota Construction for a security deposit would
be .
' (5.33) x ($650.00 per acre) x (150% contingency) _ $8660
A cost breakdown of the erosion control measures that will need to be installed is
' listed below:
Temp seed & Mulch (2.75 ac. @ $500 per acre) _ $1375
' Straw Bale check dams (5 @ $150 apiece) _ $ 750
Gravel mulch (1.66 ac.)
135 tons per acre at 5.00 per ton = $1120
' TOTAL = $3245
' Therefore, the larger amount, or the amount of security deposit obligation should be
in the amount of $8660.00.
' 20
' Denver303/458-5526
Please call if you have any questions regarding this estimate.
Respectfully,
RED Inc., Engineering Consultants
lC
Roge
21
4
RAINFALL PERFORMANCE STANDARD EVALUATION
1
PROJECT: oa lc e owe 1-7 -'TH STANDARD FORM A
COMPLETED BY: F. co o-T DATE: 1
DEVELOPED
SUBBAgIN
ERODIBILITY
ZONE
Asb
(ac)
Lsb
(ft)
Ssb
(�)
Lb
(feet)
Sb
(�)
PS
M
DU2.IIJC�
NFj'TP.L�G-f 1 O
tJ
1
O.31
4 1C�)
I. D
77, q
z
0 -7
32 (D
3
0.'a .
0.5
7 2.
4
p.49
3 ZCD
6
W o
220
0.,.
72.1
So
�•
_0•82- _
1. S`�
4 20
o.S
77. S
g
0.710_
Zsa
G_S
72,2.
707t, l_
wE1G� Te[�
pv�
Qe ��->✓
74.7
;�F7EZ GO
STeO TIO►J
.7�4Is ,5 e
oc,L -ro
DVQI
_
(� (.CANS
p.lbs
MARCH 1991 8.14 DESIGN CRITERIA
I
1
1
I
EFFECTIVENESS CALCULATIONS
PROJECT: STANDARD FORM B
COMPLETED BY: PEzay G OT DATE: II 2T 94
Erosion Control' C-Factor P-Factor
Method Value Value Cominent
C��AVI=L t tl�LGI� O,p5 1 •00 "r'o I I/Z gL�fLpve
� 13S -T�tJS AG.
"T'ENP. � DIN
Hry / S-r�cu� MvLc�' p.00 I •coo
-%KtrJ
ASf'F4r,L-j PfaVIIJq p,01 I,00 wi 3 r+cnsT:1=,
zco' cc
SOD C SS b .0 i 10 0 NDT ,w
MAJOR
PS
SUB
AREA
BASIN
(t)
BASIN
(Ac)
CALCULATIONS
74.7
PpvED
I. coto
��e >J� t ot�s t QvcT o
ASS
2.39
-
EFPcGTIVE G�
BLDC-(.
1.01
�?, I9�(O.OS> t�2.39)(O.aSi(O.OoI (I•ol�(
clp-vL.
0.s3
S,s4
NOT n�F'i=cT
"S•S4
= 0. all
707NL
82,O '/o 74.7 % - O,K.
S-SA
87•q
A�T� rorJST��c.-rlotJ
+ (0.00 .(.tb) ,,+. (0,0s) o ,s4) .
>✓��EGTIVT---
S,S4
1=r=LT1'� i F>i = I C)O
HOVE D
SST. BUT
_cTibr., a
' MARCH 1991
B-15
DESIGN CRITERIA
CONSTRUCTION SEQUENCE
PROJECT: {7 STANDARD FORH C
SEQUENCE FOR 1994,9S ONLY COMPLETED BY: P. GA$O'T DATE: H , Z61 1 4
'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 o
VERLOT GRADING
EROSION CONTROL
rIND
Soil Roughening
Perimeter Barrier
Additional Barriers
' Vegetative Methods
Soil Sealant
Other
RAINFALL EROSION CONTROL
STRUCTURAL:
'
sediment Trap/Basin
Inlet Filters
' Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
' Contour Furrows
Terracing
Asphalt/Concrete Paving
' Other
' VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
' Sod Installation
Nettings/Mats/Blankets
other
RUCTURES: INSTALLED BY MAINTAINED BY
GETATION/MULCHING CONTRACTOR
�TE SUBMITTED ` APPROVED BY CITY OF FORT COLLINS ON
' MARCH 1991 8-16 DESIGN CRITERIA
OFFSITE GRADING EASEMENT INFORMATION
11
25
I
1
1
1
1
1
1
1
1
1
1
1
DEED OF DEDICATION FOR EASEMENT
KNO' ' ALL MEN BY THESE PRESENTS:
That the undersigned, $sAB Autonaktioa_r dbeing the owner of certain real
r•ro;):- :y in Larimer County Colorado, in good and valuable consideration, does hereby
carat: :, transfer, and convey to innovation LLC a limited liability
co ,x 1 pion, for private use a temporary easement for I in the
ity Fort Collins, County of Larlrner, State of Colorado, more particularly described
on V..- fleet "DESCRIPTION FOR AN EASEMENT ON OAKRIDGE BUSINESS PARK,
5-4 i i i 11;NG", attached hereto and by this reference made a part hereof.
tVdi .ess our hands and seals this 2�tday of No e� mber , 19-4
Grantor zfE—'�
Title: Cro
Grantee
y�
Title: v�.r
Al `ic8l':
Title:
State of roInra3o
County of T.arimor
The foregoing instrument was aCknowiedged before me this
22&+idsy of November , 19—JA by RnhPr1- F. Rnea as na�Pr ,
1 and
1
t—
as
` fitness my hand and official seal.
1,1y commission expires : 19 9,
tary Pu I
1
P . 0 3
'2ngh: :?;' ; Con3ukanto
JJ .3
brt (%'M4 'C' -- -:do Os2!
TION FOR pJd EASEMEN ' ON OAKRIOGE BUSINESS PARK, 14TH FILING
7:jament on a portion of Oakridge Business Park 14th Filing
in the Northeast Quarter of section 6, Township 6 North,
3's n_s 68 West of the 6th Principal Meridian, City of Fort Collins,
)e.;r' county, Colorado being more particularly described as
cot:,.i.r .axing the South line of said Oakridge Business Park 14th
i .?.:. as bearing South 89938133" Nest and with all bearings
'..;fed herein relative thereto:
TI?'G at the Southeast corner of said Oakridge Business Park
1.lva 7iling; thence along said South line, South 89038t33" West,
437.53 feet; thence, North 00121127" West, se.00 feet; thence,
_7osla 89'38'3311 East, 502.93 feet to a point on the Bast line of
sari Oakridge Business Park 14th Filing; thence along said East
south 14030138" West, 60.ol feet to the Point of Beginning.
;rove described easement contains 28723 square feet and is
to all easements and rights-af-way now on record or
v
Nvver=/465.5525
9/13/94
348-003
■:.
CHARTS, FIGURES, AND TABLES
28
DRAINAGE CRITERIA MANUAL
RUNOFF
5C
30
►- 20
z
w
U
tr
w
a 10
z
w
a
O 5
U)
w
o�c 3
O
co 2
w
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_=
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RUM
,�■ I I
��_��
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NONNI
NONNI
IF5111111110C
FAINIFAIN
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CC:::C�
iiAMIRMI,
ii
i
MIANV■Nria�
ORMOiii
MONNIN��
5'`
i
z s .5 1 2 3 5 10 20
VELOCITY IN FEET PER SECOND
FIGURE 3-2. ESTIMATE OF AVERAGE FLOW VELOCITY FOR
USE WITH THE RATIONAL FORMULA.
*MOST FREQUENTLY OCCURRING "UNDEVELQPED"
LAND SURFACES IN THE DENVER REGION.
REFERENCE: "Urban Hydrology For Small Watersheds" Technical
Release No. 55, USDA, SCS" Jan, 1975.
5-1-84
URBAN DRAINAGE & FLOOD CONTROL DISTRICT
DRCOG
No Text
INTERPOLATED VALUES FOR 100 YEAR INTENSITIES
Tc
Value �rJ,/"7-)
5.00
9.0
5.10
9.0
5.20
8.9
5.30
8.9
5.40
8.9
5.50
8.8
5.60
8.8
5.70
8.7
5.80
8.7
5.90
8.7
6.00
8.6
6.10
8.6
6.20
8.6
6.30
8.5
6.40
8.5
6.50
8.5
6.60
8.4
6.70
8.4
6.80
8.4
6.90
8.3
7.00
8.3
7.10
8.2
7.20
8.2
7.30
8.2
7.40
8.1
7.50
8.1
7.60
8.1
7.70
8.0
7.80
8.0
7.90
8.0
8.00
7.9
8.10
7.9
8.20
7.8
8.30
7.8 /
8.40
7.8
8.50
7.7
8.60
7.7
8.70
7.7
8.80
7.6
8.90
7.6
9.00
7.6
9.10
7.5
9.20
7.5
9.30
7.5
9.40
7.4
9.50
7.4
9.60
7.3
9.70
7.3
9.80
7.3
9.90
7.2
10.00
7.2
'
Table 8B C-Factors and P-Factors for Evaluating EFF Values.
Treatment C-Factor
P-Factor
BARE SOIL
Packedand smooth................................................................ 1.00
1.00
Freshly disked 1.00
0.90
'
Rough irregular surface ........................................................... 1.00
SEDIMENT BASIN/TRAP. .. 1.00
0.90
0.5011'
STRAW BALE BARRIER, GRAVEL FILTER, SAND BAG .............:.......... 1.00
..................................................................... SILT FENCE BARRIER 1.00
0.80
0.50
\
'
ASPHALT/CONCRETE PAVEMENT ................................................... 0.01
ESTABLISHED DRY LAND (NATIVE) GRASS .......................... See Fig. 8-A
1.00
1.00
'
SOD GRASS ...................... 0.01
1.00
TEMPORARY VEGETATION/COVER CROPS .............................. ..... 0.45"'
1.00
HYDRAULIC MULCH @ 2 TONS/ACRE........................................... 0.1001
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
1 /4" 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 planting crass seed, apply mulch at a rate of 2 tons/acre (minimum) and adequately anchor,
tack or crimp material into the soil.
Slope I%)
1 to 05
1.00
'
........................................................................0.06
6 to 10 . ....0.06
11 to 15............................................................................. 0.07
1.00
1.00
'
16 to 20............................................................................. 0.11
21 to 25.............................................................................0.14
1.00
1.00
25 to 33.............................................................................0.17
1.00
> 33.......................................................................... 0.20
1.00 .
NOTE: Use of other C-Factor or P-Factor values 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
(3) Hydraulic mulches shall be used only between March 15 and May 15 unless
(4) Value used must be substantiated by documentation.
are not required.
irrigated.
MARCH 1991 8.6 DESIGN CRITERIA
P
Table 8-B C-Factors and P-Factors for Evaluating EFF Values (continued from previous page).
Treatment C-Factor
P-Factor
'
CONTOUR FURROWED SURFACE
Must be maintained throughout the construction period, otherwise P-Factor =
1.00.
Maximum
length refers to the down slope length.
'
Basin Maximum
Slope Length
(feet)
1 to 2 00.
0.0
300 ..........................................................................
3 to 5 00.
1.00
0.50
6 to 8 200..........................................................................1.00
0.50
9 to 12 120..........................................................................1.00
0.60
'
13 to 16 80..........................................................................1.00
0.0
17 to 20 60. .1.00
0.80
> 20 50 ......................................................................
1.00
0.90
'
TERRACING
Must contain 10-year runoff volumes, without overflowing, as determined by applicable
hydrologic
methods, otherwise P-Factor = 1.00.
Basin
Slope M
1 to 2.....................................................................................
1.00
0.12
3 to: 8.....................................................................................
1.00
0.10
9 to 12.....................................................................................
1.00
0.12
13 to 16.....................................................................................
1.00
0.14
17 to 20.....................................................................................1.00
0.16
> 20.....................................................................................
1.00
0.18
NOTE: Use of other C-Factor or P-Factor values reported in this table must be substantiated by documentation.
i.
' MARCH 1991 8.7 DESIGN CRITERIA
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MARCH 1991 8-4 DESIGN CRITERIA
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' Calculations for Curb Capacities and Velocities
Major and Minor Storms
per City of Fort Collins Storm Drainage Design Criteria
COLLECTOR w/ 6" Vertical curb and gutter Prepared by: RBD, Inc.
G is for one side of the road only February 28, 1992
' V is based on theoretical capacities
Area a 3.55 sq.ft. Area = 28.96 sq.ft.
' Minor Storm : Major Storm
Slope Red. Minor 0 V Major C V
(%). :Factor : X : (cfs) :.(fps) : x : (cfs) (fps)
' 0.40 0.50 : 135.32 : 4.28 2.41 : 1129.59 : 35.72 2.47 :
0.50 0.65 : 135.32 : 6.22 2.70 : 1129.59 : 51.92 2.76 :
0.60 0.80 : 135.32 : 8.39 2.95 : 1129.59 : 70.00 : 3.02 :
' 0.70 0.80 : 135.32 : 9.06 3.19 : 1129.59 : 75.61 : 3.26 :
0.80 : 0.80 : 135.32 : 9.68 :' 3.41 : 1129.59 : 8D.83 : 3.49 :
0.90 : 0.80 : 135.32 : 10.27 : 3.62 : 1129.59 : 85.73 : 3.70 :
1.00 : 0.80 : 135.32 : 10.83 : 3.81 : 1129.59 : 90.37 : 3.90 :
1.25 : 0.80 : 135.32 : 12.10 : 4.26 : 1129.59 : 101.03 : 4.36 :
1.50 0.80 : 135.32 : 13.26 : 4.67 : 1129.59 : 110.68 : 4.78 :
1.75 0.80 : 135.32 : 14.32 : 5.04 : 1129.59 : 119.54 : 5.16 :
' 2.00 0.80 : 135.32 : 15.31 : 5.39 : 1129.59 : 127.80 : 5.52 :
2.25 0.78 : 135.32 : 15.83 : 5.72 : 1129.59 : 132.16 : 5.85 :
2.50 0.76 : 135.32 : 16.26 : 6.03 : 1129.59 : 135.74 : 6.17 :
'2.75 0.74 : 135.32 : 16.61 : 6.32 : 1129.59 : 138.62 : 6.47 :
3.00 0.72 : 135.32 : 16.88 : 6.60 : 1129.59 : 140.87 : 6.76 :
3.25 0.69 : 135.32 : 16.83 : 6.87 : 1129.59 : 140.51 : 7.03 :
' 3.50 0.66 : 135.32 : 16.71 : 7.13 : 1129.59 : 139.411 : 7.30 :
3.75 0.63 : 135.32 : 16.51 : 7.38 : 1129.59 : 137.81 : 7.55 :
4.00 : 0.60 : 135.32 : 16.24 : 7.62 : 1129.59 : 135.55 : 7.80 :
4.25 0.58 : 135.32 : 16.18 : 7.86 : 1129.59 : 135.07 : 8.04 :
'4.50 : 0.54 : 135.32 : 15.50 : 8.09 : 1129.59 : 129.40 : 8.27 :
4.75 : 0.52 : 135.32 : 15.34 : 8.31 : 1129.59 : 128.02 : 8.50
5.00 0.49 : 135.32 : 14.83 : 8.52 : 1129.59 : 123.77 : 8.72
'5.25 0.46 : 135.32 : 14.26 : 8.73 : 1129.59 : 119.06 : 8.94
5.50 0.44 : 135.32 : 13.96 : 8.94 : 1129.59 : 116.56 : 9.15
5.75 0.42 : 135.32 : 13.63 : 9.14 : 1129.59 : 113.76 : 9.35
' 6.00 0.40 : 135.32 : 13.26 : 9.34 : 1129,59 : 110.68 : 9.55
11
OAKRIDGE DRIVE
%SnNG SITE HYOROLOGY
Total Area '.5.54 0
Rational "C_: 0.25c AN • oa IN
knew- 025 r e
l a
R OPFDFV SITE H"DROLOGY
lea
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Mytat
EROSION CONTROL NOTES
A GENERAL CONCEPT
This eeMopanMt lea with the Moderate Wind E oki Zone and the
BIT go
O 21'
dnKpp 2.4 1J Ot0 0 ifi' J
-3___ 3
O SUBDRAIN
O.Sx
30'
REGIONAL ELEMENT 20 (EXISTING)
P.....«�/..�/•ram.///J///^��4WID"EE FUND
C
0
I � �
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Moderate Rainfall Eroffil ly zone per the City of EVIL CollinsPa.
The Erosion Cava Performance Standard (PS) fair the at as
computed to be ]4.]x before and 879x after constructionpar the City of
Fort '
CdEns Erosion Control Reference III Iw Construction St . Thed
d
Effectiveness BEEF) of the proposed erosion control plan was colmlalN
to be 82.0% during construction and 92.9% after construclon. Therefore
the erosion consvd plan as detailed in the oppenidl, and on the flooding.
1
drainage and erosion control plan meets the City of Fort Collins
i
requirements
_
1
I. After the ov not gadxlg has been completed. all disturbed
areas, not In a building. sidewalk. or roadway, Shall have
w
mporary vegetation seed applied per the specifications
I %
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n This sheet After seed, a hay or straw mulch shall be
applied over the seed at a role of 2 tons par acre (MIN)
and it shall be anchored, lacked. an crimped onto the ma
Z
per the methods on this Meet. A growl mulch Shall be
p
at the rate of 135 fore par acre on all areas that are to
be paved or covered with gravel.
A
2. Straw bake chock dams are to he Placed as shown on this
p
sheet. These bales are to be re-nowd after constructor,
Z y
except for the ones in the Section 'A' Ditch.
d. After the overact Waring and utility installation has
e
t
been completed, the parking lot Surface will receive
1'
the curb. gutter and pavement Surfaces. After
1
nstallaUan of the curb, gutter and goverment surfaced T1N1
B' CONCRETE SWALK
the Permanent landscaping surfaces (grass Will) whi be CULVERTS I
Installed to protect the bore ground. Qj a'p
a°W °N
>eN`��
NOTE:
ALL SPOT ELEVATIONS SHOWN ARE RONLNE
OR TOP BE PAVEMENT.
woe,. mwLr sro ermnc,m rk 9s)ri_ mw�
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`we'�ee Grit yam �A. w�W ... W`rfem`a
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SCALE 1'=40' r
LEGEND
O
EXISTING MANNIX£
f.E
FINISHED BOOR ELEVATION
3
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V
EXISTING FIRE HttXUNT
yS'�''
EXISTING SPOT ELEVATION
ralp ryc m
EXISTING CONTOUR
wi
PROPOSED SPOT ELEVATION
4•
• gapu,6p raAvr wrr
-89-i
PROPOSED CONCEDE
IQ
DESIGN PONT
COwVGId V¢R9NXalE
11si rP usrm u-9w
rr-
FLOMLINE
DRAINAGE BASIN ROONOART
SCALE
BASIN NUMBER
Y]r. 49m
1
DI�A11 m
EDGE OF GRAVEL
1.44 AC
BASIN AREA
INFLOW CURB IS GUTTER
STRAW BALE BARRIER
OUTFALL CURB k CUTTER
�.- p••�• _."..... f !
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olREcnoN of Row
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far / •rrn
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6 3 ! L5e AC
e _08 AC �Aa f s
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WIDE EUBB OPENING
F F = 662
Ds
pro - °y
arm- 1.ae
uw. 14M rN
amix gem IN
NPDES
NOTES.
a..
t 92
RSOm9M..
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park x ymne; many. eorw a.. onJ
•. Pxu sTy s raPxw•RN uµ•CFYENr:
uNxy rnrwcom N Nmnn m he ate
Xano-i,u
DEEP CLAS 6
a V,w.11cs uW r N, I
BURSAR
RIPRAP ON t2" CDO
a
me In�p "term w. pwnU N w Mmu9
nmuimrm e". toe Amu comet.
come Nai
GLASS A BEDDING
Own' wash Italy-euletim ma
WN,
ON EACH SIDE Of I WALE
cacti N,
a rIHe
as in e
SUBDRAI6L.HERE
I-
The re claim
be
DATt1GHT
Alasm
mwellOws"e ncief Id
r EXIST. 15" RCP
�(TO BE REMOKD)
EXIST, 10', 10' L'IATS OF
CLASS 6 RIP RAP
O
Al
r �
rc
O e95T P4VA POWER PLCEV
yyo NOT o BE DivJRBED QI
O
J
ask . 22D' rN
am. A ON
6 1.
n °re SUBDIR J / 0 • 25.M eN
ram w HERE !n Was
31Yd2" DEEP 0.A55 6 ,m-
RIPRAP (BURIED) ON 12" J 20 DRAINAGE EASOMENTGAILL urkn9 wre�r
CDEA CLASS A BEDDING }�-0�-1987
ON EACH ASS OF SWALE REGICNAt ELEMENT Y20
_ sfcTI SNOWN }BOOT 6344700
34 p
(1200' 70 REtlO11K iNr.W MR
DEIEsonew retsu Y)
PAVEMENT THICKNESS ALTERNATES
P_eWey_=cal Park,m9
(Parking stalls. 19' from curb and gutter
fim0ce)
Asphalt Concrete
2 1/2
CNme Aggregate soft Course
4"
Total Pavement Thinness
6 1/I" 4950
Driveways and Track Loading Areas (Brawn
(All pavW crew, not including parking stall.)
Asphalt Concrete
3"
4955
CrvMed Aggregate Bane Course
6"
total Pow cut R¢kneee
9"
d Iw�cl.tn 4dLm�"w�
Euznev OLVL
sauoxe WADE
m�R
tag I
od'z i
1+00 0+00
SO90(UIN DAYLIGHTING DETAIL
FOR SECTION 'A' TO SWALE 'F'
Ef'Z•l)
4955
• EWs, aMnq a mMlm, nN
eW UN pail,1mN p, the nee
Paare d^9�
a
OTHER co m0.5
4
enMal •C -
menk Th. are P. Whis the
e. Mru rmo
in*
WY WHIdEm IttYYY
nN„ n If
of MW
bwwar has je r we.°.or,. ef, m
acy", nateina, In
tedhw
eras
wU bra 5% Me tier
raw
b
uaa
aw klr 1, Win eM and
spark al
�frw
ran n�e°tllfrrwm n
n
The nln .n. Ne..I - Ina'.
:spral :non
veam,
dr CA. F., �Wx Awwroor.
r.
r mmk Sugar eNeme We I®red We per
oe
a.
WRIEcnaN AND .YxTEv.Aia
raw
q
ranya Yper PoYE seed,
o w an
S .tin
nwni uaNM raw as ease Inew
�rM�Ia 6I a saohms any
wId w nLW as ,m.r
N F
any pas,
e d e,n
k weem d`ie
'-
'yµWW Orm �w.a wu �Nal raves,
.m-
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we be adw w m as Wtnum d Sur we
ths, ae�t yes elan W uNwHW , warn
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2. SIR YIN.
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ee
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Sal � Co9d Ndm N4 Sywv taut NY wrres
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m wmtl pNlau yw
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we
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S - 05%
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, J Oho O 0.6'
stop a Ine aft 17
R
O SUBDRAIN
SECTION A s - Dsx
stoo - 5.2 cfa
4.4' 4.4'
dnm .0T
,L_ 01000.5' _J
SECTION E R
O SUBDRAIN
S O.Sx
BOB ' 23 cfa
2 .0 2.8'
0100 0 1.2'
6.6' dnWypAw-1.4'
BID O pre' I
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SECTION R
0 SUBDRAIN
- s-asx
Photo • I 1 - DIED 100 cfa
6'
dR®a19n=1.3'
CEO • 0.9' J 1
1 .2'
SUBDRAIN
SECTION F
0 5x
Elm . 3.92 Of
52' e;
City of Fort Collins, Colorado
tt f
DTnM PLAN APPROVAL
SECTION C
R
APPROVED, _
m for of Wla«rwr
Dale
0100 O 1.3 1
CHECKED By. NA
DID Y O.T
xan reslesmr�VUtlt!
Date
dnsE -t 5'
J 1
!t!
�� rp i.✓s f9_M-1#,
CHECKED Br. _._
11,011SUBDRAIN
Etormwdter UtdltT
Date
S - 0.5x
6
CHECKED BY: - -
Otlp = IT.9 cast
PUN inReenatm
Date
a'
CHECKED By
SECTION D
CHECKED By
AG PEE
uuiNN oasCbED
OCT 1994
a IT
R�8AC I �3i)
CIRCKL: Engineering Consultants
3-003
OAKRIDGE BUSINESS PARK OVERALL
SEVENTEENTH FILING GRADING, DRAINAGE, & EROSION CONTROL PLAN 5 4