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HomeMy WebLinkAboutDrainage Reports - 10/30/2001Final Approved Report
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JUN 2 6 2001
FINAL DRAINAGE ANALYSIS
- LOT 2-
MULBERRY AND LEMAY CROSSINGS
FT COLLINS, COLORADO
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FINAL DRAINAGE ANALYSIS
- LOT 2-
MULBERRY AND LEMAY CROSSINGS
FT COLLINS, COLORADO
October 5, 1999
r. March 1, 2000
r. July 3, 2000
r. September 29, 2000
r. November 22, 2000
1 Prepared For:
Goldberg Properties
1120 Lincoln Street #1101
Denver, Colorado 80203
(303) 759-8000
Prepared By:
CLC Associates, Inc.
8480 East Orchard Road, #2000
Englewood, Colorado.80111
' (303) 770-5600
"This final report for the drainage design of Lot 2, Mulberry and Lemay Crossings was
prepared by me (or unde�E��' llihoedd bq.. supervision) in accordance with the provisions of
City of Fort Collins St, tv;0A o,sign and Technical Criteria, and was designed
to comply with the p
' Jeffrey A. Holley, P.E.''%nn 0FES �\�����
State of Colorado Registraf(Wi' 9. 29099
' For and on behalf of
CLC Associates, Inc.
FINAL DRAINAGE ANALYSIS
- LOT 2-
`'
MULBERRY AND LEMAY CROSSINGS
FT COLLINS, COLORADO
CLC JOB NO.96.040
TABLE OF CONTENTS
�I
I. GENERAL LOCATION AND DESCRIPTION ............................
1
It. DRAINAGE BASINS AND SUB -BASINS ...............................
1
III. DRAINAGE DESIGN CRITERIA ......................................
2
IV. DRAINAGE FACILITY DESIGN ......................................
2
V. STORMWATER QUALITY CONTROL PLAN ............................
3
VI. CONSTRUCTION ACTIVITIES STORMWATER MANAGEMENT PLAN ......
3
VII. CONCLUSIONS ..................................................
3
VIII. REFERENCES ...................................................
4
APPENDIX A - HYDROLOGIC CALCULATIONS
APPENDIX B - INLET SIZING
APPENDIX C - HYDRAULIC CALCULATIONS - STORM SYSTEM B
APPENDIX D - HYDRAULIC CALCULATIONS - STORM SYSTEM C
' APPENDIX E - REFERENCE MATERIALS
APPENDIX F - MISCELLANEOUS CONSTRUCTION DETAILS
APPENDIX G - EROSION AND SEDIMENTATION CONTROL
rAPPENDIX H - RIP -RAP CALCULATIONS
APPENDIX I - POND 2 VOLUME CALCULATIONS AND REVISED SWMM MODELS
APPENDIX J - CITY COMMENTS AND CONSULTANT RESPONSE
BACK POCKET - DRAINAGE PLAN
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FINAL DRAINAGE ANALYSIS
- LOT 2-
�, MULBERRY AND LEMAY CROSSINGS
FT COLLINS, COLORADO
I. GENERAL LOCATION AND DESCRIPTION
Lot 2 of Mulberry and Lemay Crossings is approximately 16.51 acres. It is
bordered on the north by Magnolia Street, the south by Mulberry street (Colorado
Highway 14), the west by Lemay Avenue, and the east by 121h Street. The site is
a portion of the development previously analyzed in the Final Drainage Analysis,
Mulberry and Lemay Crossings, Ft. Collins, Colorado, prepared by CLC
Assoicates, September, 1999. This report is an amendment thereto.
Construction drawings for the site show an ovedot grading condition with
constructed storm sewer traversing the site. The southwest comer of the site is
a detention pond that serves the entire site and release storm water south to the
Poudre River.
The purpose of this report will be to:
1. Provide a detailed analysis and comparison of runoff coefficients to
demonstrate compliance with the previous report, and
2. Provide final storm inlet sizing and supplemental storm sewer hydraulics
for proposed storm sewer not analyzed in the previous report.
_ II. DRAINAGE BASINS AND SUB -BASINS
Historic Drainage
The site lies within the Poudre River drainage basin. Historically, the stormwater
from the site is directed south where it collects in low points on the north side of
Mulberry Street. Culverts at various locations along the right-of-way allow the
stormwater to pass under Mulberry and the developed area to the south where it
enters the Poudre River.
The site lies within the 100-year flood limits (Refer to the exhibits in the Appendix.)
Development of the site will be done in accordance with FEMA and City of Fort
Collins guidelines for construction within a floodplain. The floodway does not
encroach upon the site. All proposed construction and land uses will be in
accordance with the above guidelines.
I
I.
FINAL DRAINAGE ANALYSIS
- LOT 2-
MULBERRY AND LEMAY CROSSINGS
FT COLLINS, COLORADO
Developed Drainage
Lot 2, as developed, will be divided into two principal sub -basins with a total area
of approximately 16.51 acres.
Basin B The area along the west side of the site. Runoff from this area is
collected into Storm Sewer System B and conveyed to Pond P2.
Basin C The area along the east side of the site south of the proposed
Magnolia Street. Sub -basins are collected in Storm Sewer system
C and piped to detention Pond 2.
III. DRAINAGE DESIGN CRITERIA
This analysis was prepared in accordance with the Storm Drainage Design
Criteria Manual (SDDCM) of the City of Fort Collins and the Urban Drainage and
ri Flood Control Manual (UDFCM).
Runoff values for the 10-year rainfall event were used to size storm sewer.
Calculations were done with StormCAD by Haestad Methods which uses the
Rational Method as allowed under Section 5.2 of the City of Fort Collins Storm
Drainage Design Criteria. The analysis was done with the latest
timelntensity/frequency curves provided by the City. A five minute time of
concentration was used for each sub -basin.
IV. DRAINAGE FACILITY DESIGN
Storm sewers across the site will be used to drain low points in parking areas.
Major storms will partially be collected in the sewers but are allowed to proceed
overland to the detention ponds. Proposed finished floor elevations will be set to
18 inches above the floodplain, which varies from west to east across the site, as
indicated on the FIRM panels shown in the appendix.
A detention pond, sub -basin P2, is located in the southwest comer of the site.
Details for the design and construction of the pond were included in the previous
study.
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FINAL DRAINAGE ANALYSIS
-LOT 2-
MULBERRY AND LEMAY CROSSINGS
FT COLLINS, COLORADO
V. STORMWATER QUALITY CONTROL PLAN
Stormwater quality is addressed in the design of the detention pond P2. Details for
the design and construction of the pond appear in the previous report.
VI. CONSTRUCTION ACTIVITIES STORMWATER MANAGEMENT PLAN
Construction Activities Erosion Control
Erosion control during the construction period will be outlined on the Grading and
Drainage and Erosion Control plan. Silt fences will be used along the edges of
the site abutting public right-of-way. The fence will be placed behind the back of
curb or, in the case of an attached sidewalk, behind the back of walk. Inlet
protection, consisting of gravel filters will be used for all of the inlets until disturbed
areas are paved or landscaping is established. The contractor is advised to use
vehicle tracking control where vehicles enter and exit the site.
Permanent Stabilization
When complete, all of the site will be either paved or landscaped. Landscaping
will be either gravel mulch or turf grass. No reseeding will be done.
VII. CONCLUSIONS
1. Calculations for the runoff coefficients for the proposed development
appear to comply with the values calculated in the previous report.
2. Hydraulic calculations for the proposed inlets and storm sewer appear to
be in agreement with drainage concept as set forth in the previous report.
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FINAL DRAINAGE ANALYSIS
- LOT 2-
MULBERRY AND LEMAY CROSSINGS
FT COLLINS, COLORADO
Vill. REFERENCES
1. Storm Drainage Design Criteria Manual (SDDCM), City of Fort Collins, Colorado,
May, 1984.
2. Urban Storm Drainage Criteria Manual, Denver Regional Council of
Governments, Denver, Colorado March 1969 (with'current revisions).
3. Poudre Master Drainageway Plan, Chapter 7, City of Fort Collins Stormwater
Utility, by Ayres Associates, Fort Collins, Colorado, September, 1995.
4. StormCAD v. 1.5, by Haestad Methods, Inc., 1997.
4
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APPENDIX A - HYDROLOGIC CALCULATIONS
I
Weighted Runoff Coefficients
Date:
O7KAM
Job Name: Lot 2 - Mulberry and Lemay Crossings
Job Number: 96.040
C
CIO
C100
Impervious
Pavement 0.95
0.95
100%
Landscape 0.25
0.25
1.25'C1O
0%
Roof 0.95
0.95
90%
Land Use (Acres)
Weighted Runoff Coefficient
%
Basin Pavement
Landscape
Roof
Total
CIO
C1O0
Impervious
Basn B
Basins as analyzed in the Final Drainage Report for Mulberry and Lemay Crossings
B8 1.95
0.15
0.00
2.10
0.90
1.00
93%
B9 1.68
0.15
0.O0
1.83
0.89
1.OD
92%
B1O 3.18
0.25
0.00
3.43
0.90
1.00
93%
B2-2 0.10
0.05
O.OD
0.15
0.72
0.90
67%
1331 0.08
0.03
0.00
0.11
0.76
0.95
73%
135-1 0.26
0.07
0.00
0.33
0.80
1.00
7996
B6-1• 0.56
0.11
O.OD
0.67
0.84
1.00
84%
P2 0.23
1.53
O.OD
1.76
0.34
0.43
13%
Total:
10.38
Weighted Avg:
77%
�
Basins with Lot 2 PUD detail (This Report)
132-2 0.10
0.05
0.00
0.15
0.72
0.90
67%
83.1 0.08
0.03
O.OD
0.11
0.76
0.95
73%
85-1 0.27
0.07
O.OD
0.34
0.81
1.00
79%
136-1 0.58
0.07
O.OD
0.65
0.87
1.00
89%
B8 1.93
0.17
0.00
2.10
0.89
1.00
92%
1
B9 0.54
89-A 0.76
0.20
0.19
0.00
0.00
0.74
0.95
0.76
0.81
0.95
1.OD
73%
80%
B9-13 1.69
0.16
O.OD
1.85
0.89
1.00
91 %
B1O 0.59
0.05
0.00
0.64
0.90
1.00
92%
B14A 0.74
0.15
O.OD
0.89
0.83
1.00
83%
P2 0.10
1.30
0.36
1.76
0.43
0.54
24%
Total:
10.18
Weighted Avg:
76%
Basin C
Basins as analyzed in the Final Drainage Report for Mulberry and Lemay Crossings
C1 0.93
0.10
O.OD
1.03
0.88
1.OD
90%
CI-2 1.67
0.45
DOD
2.12
0.80
1.00
79%
C13 1.35
0.22
DOD
1.57
0.85
1.00
86%
C2-1 0.78
0.11
0.00
0.89
0.86
1.00
88%
C3-2 0.89
0.12
0.00
1.01
0.87
1.00
88%
C4-1 0.57
0.07
0.00
0.64
0.87
1.00
89%
Total:
7.26
Weighted Avg:
85%
Basins with Lot 2 PUD detail This Report)
C1 O.70
0.34
DOD
1.04
0.72
0.90
67%
CI-2 1.74
0.15
0.28
2.17
0.90
1.00
92%
C13 0.32
0.09
1.23
1.64
0.91
1.00
87%
C2-1 0.21
0.15
0.69
1.05
0.85
1.00
79%
C3-2 0.78
0.11
0.00
0.89
0.86
1.00
88%
C4-1 0.19
0.10
0.38
0.67
0.85
1.00
79%
'
Total:
7.46
Weighted Avg:
84%
' Estimated from approved preliminary PUD.
<77% from
MIL Crossings
Final Drainage
Report
<85% from
M/L Crossings
Final Drainage
Report
I
Direct Runoff Table
Job Name: Lot 2 - Mulberry and Lemay Crossings
Date:
Job Number: 96.040
Direct Runoff based On:
Tc =
5.00
min
1(10) =
4.87
in / hr
1(100) =
9.95
in / hr
Direct Runoff (cfs)
Basin Area
C10
C100
Q10
0100
B2-2 0.15
0.72
0.90
0.52
1.34
B31 0.11
0.76
0.95
0.41
1.04
B5-1 0.34
0.81
1.00
1.33
3.38
B6-1 0.65
0.87
1.00
2.77
6.47
B8 2.10
0.89
1.00
9.14.
20.90
B9 0.74
0.76
0.95
2.74
7.00
B9-A 0.95
0.81
1.00
3.75
9.45
B9-B 1.85
0.89
1.00
8.01
18.41
B10 0.64
0.90
1.00
2.79
6.37
B1O-A 0.89
0.83
1.OD
3.61
8.86
P2 1.76
0.43
0.54
3.71
9.48
Cl 1.04
0.72
0.90
3.65
9.33
C1-2 2.17
C13 1.64
0.90
0.91
1.OD
1.00
9.53
7,28
21.59
16.32
C2-1 1.05
0.85
1.OD
4.35
10.45
C3.2 0.89
0.86
1.OD
3.74
8.86
C4-1 0.67
0.85
1.00
2.76
6.67
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APPENDIX B - INLET SIZING
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inlet Sizing
Date: 07/04M
Job Name;
Lot 2 - Mulberry and Lemay crossings
Job Number: 9&040
Direct
Contributing
0(100)
Inlet
Inlet
Area
(cfs)
Condition
82-2
02-2
1.34
1.5% Grade
4 wide curb opening
B31
B3.1
1,04
1.5% Grade
4 wide curb opening
85-1
BS-1
3.38
Sump
4 wide curb opening
B6.1
B64
6.47
Sump
3-toot Type 13 Comb
B8
BB
20.90
Sump
12-fed Type 13 grated Irdet-
B9
B9
7.00
Sump
9-foot Type 13 Comb
B9-A
B9-A
9.45
Sump
6-toot Type 13 Comb
B&B
B9-B
18.41
Sump
9-foot Type 13 Comb
810
810
6.37
Sump
9400t Type 13 Comb
B10•A
810-A
8.86
Sump
6-foot Type 13 Comb
Cl
Ci
9.33
Sump
6-foot Type 13 Comb
C1-2
C11-2
21.59
Sump
15•foot Type R Inlet
C13
C113
16.32
Sump
10-toot Type R Inlet
C2-1
C2-1
10.45
Sump
4 wide curb opening
C3.2
C3.2
8.86
Sump
4 wide curb opening
C4-1
C4-1
6.67
Sump
4 wide curb opening
1. Allowable pending for design is 1.0 feet ( Sump condition).
2. Minimum time of concentration of 5.0 minutes is used,
3. Inlets are sized to accept 100 year rainfall.
t-o Pr
USE = O. r!s
'+� = o$ = S'.os,F
Gft+�T� A1'zE1� �.7 SF' QAV-rM 4j4 R32-V.0 R ��
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IAPPENDIX C - HYDRAULIC CALCULATIONS - STORM SYSTEM B
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1
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RainlaN Mt City o1 Fort Collirm
using -C r Table
for
(31 minutes — So minutes)
Figure 3-1b
City of Fort CoUlm
' Rabrfall lntansgy4Duration-Frequency Table
for using the Rational Method
(5 minutes - 30 minutes)
Figure 3-10
1
1
CO-d
1
1
1
Duration
2-year
10-year
100•year
(minute3)
Intensity
Intensity
Intensity
btlhr
5.00
2.85
4.87
9.95
6.00
2.67
4.58
9.31
7.00
2.52
4.31
8,B0
8.00
2.40
4.10
8.138
9.00
2.30
3.93
10.00
2.21
3.78
11.00
2.13
3.83
12.00
2.05
3.50
13.00
1.98
3.39
14.00
1.92
3 29
8.71
13.00
1.87
3.19
6.52
18.00
1.81
3.08
8.30
17.00
1.75
2.99
6.10
10.00
1.70
2.90
5.92
19.00
1.65
2.82
5.76
20.00
1.61
Z74
5.60
21.00
1.58
2.67
5.48
22.00
1.53
.81
5.32
23.00
1.49
.55
5.20
00
1.48
48
5.09
25.00
1.43
44
L:2,39
4.98
26.00
1.40
4.8727.00
1.3734
4.78
28.00
1.34
2.20
4.BS
29.00
1.32
2.25
4.60
30.00
1.30
2.21
4,
-#C 't 1 6i_1- .,
FIGURE 7-6: MANHOLE AND JUNCTION LOSSES
/
PLAN NOTE: FOR ANY TYPE PLAN
OF INLET
°�v e
USE EQUATION
SEC iION USE EQUATION SECTION
CASE.1 CASE 11
INLET OR STRAIGHT THROUGH INLET ON MAIN LINE
MANHOLE ON MAIN LINE _ WITH
_BRANCH LATERAL
g
o•
PLAN
USE EQUATION
SECTION CAS�,N6.
I
CASE IL R
MANHOLE ON MAIN LINE tv
YYITH 0• BRANCH LATERAL
REFERENCE: APWA SPECIAL REPORT NO.49. I961
u
/ PLAN °'
USE EQUATION
4r.
SEQn�
CASE IV
INLET OR MANHOLE AT
BEOIN NINQ Q,F t
CASE It
KI
0
Ki
0.05
22-IR
0.75
0.2S
45
0.60
1.23
60
OAS
90
0.26
NO LATERAL
SEE CASE I
7.07 INLm
(A) specifkagms
(1) Regafted: Storm inlets SMII be Provided where sump (IOW -spot) conditions exist or
Street runoff' -carrying capacities am exceeded.
7-29 DESIGN AND GONSTRUMON STANDARDS Effective: July 2, 1999 _./
I
1
1
1
DRAINAGE CRITERIA MANUAL h °F .d,
RUNOFF
TABLE 3-1 (42)
RECOMMENDED RUNOFF COEFFICIENTS AND PERCENT IMPERVIOUS
LAND USE OR PERCENT FREQUENCY
SURFACE CHARACTERISTICS IMPERVIOUS 2 5 10 10Q
Business:
Cortmercial Areas
95
.87
.87
.88
.89
Neighborhood Areas
70
.60
,65
,70
.80
Residential:
Single -Family
*
.40
.45
.50
.60
Multi -Unit (detached)
50
.45
.50
.60,
.70
Multi -Unit (attached)
70
.60
.66
.70
.80
1/2 Acre Lot or Larger
*
.30
.35
.40
.60
Apartments
70
.65
.70
.70
Industrial:
.80
Light Areas
80
.71
.72
.76
.82
Heavy Acres
90
.80
.80
.85
Parks, Cemetaries:
7
.10
.10
.35
.90
Playgrounds:
13
.15
.25
.35
.60
Schools:
50
.45
.50
.60
.65
Rail road Yard Areas -
40
- .40
.45
.50 -
,70
Undeveloped Areas:
.60
Historic Flow Analysis-
2
(See *Lawns")
Greenbelts, Agricultural
Offsite Flow Analysis
(when land
45
.43
.47
.55
use not defined)
.65
Streets:
Paved
100
.87
.88
..90
Gravel
Drive
13
.15
'.25
35
.93
.65
and Walks:
Roofs:
.87
.87 . _ _
-
.88.89
Lawns, Sand Soil
90
.80
.85
•90
90
0
0
.00
.01.
.05
.20
:OS
.IO
.20
,40
NOTE: These Rati 1 F
orta ormula coefficients may not be valid for large basins.
*See Figure 2-1 for percent impervious.
5-1-84 '
No Text
STORM DRAINAGE DESIGN AND .TECHNICAL CRITERIA FIGURE 903
C
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ALLOWABLE INLET CAPACITY
SUMP CONDITIONS ALL INI FTc
0.2
REFERENCE:
DEPTH OF FLOW (FT)
0.4 0.6
DEPTH OF FLOW (ft)
0.8
w�
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m Q
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4 0.3
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EXAMPLE
_
I
3
_t
0 1 2 3 4
FLOW INTO INLET PER SO. FT. OF OPEN AREA (CFS/FT2)
Figure 5-3
CAPACITY OF GRATED INLET IN SUMP
(From: Wright -McLaughlin Engineers, 1969)
5
OESIGN CRITERIA
4 (Crass Slope)
STREET i 1 onpltudinal S")
SIDE � B
A It � o
a t.
(Guitar Flow)
CARRY ..
OVER
Fronds No at This Point rFw
al g ♦J
(Intee�ted Flow)
L'
LWO at Opening)
A 4J .PLAN
Original Gutter Uns
�& T--'
Gutter Depression at Inlet
e
ECTI N A
2 -A
n�
i
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SECTION B-B SECTION B-B
( Straight Cross Slope) ( Far Collins, Standard 6C W"ical C &G)
NOrE= THE PORT COLLINS STANaAROS HAVE
GUTTERS WITH CROSS SLOPES STEEPEN THAN SX.
FIGURE 5-4
STANDARD CURB -OPENING INLET
MAY 19"
DESIGN CRITERIA
No Text
No Text
6W.1 ov
a-v
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=g a 3f' t ems= \< • b LEGEND: Figure 7.6:
100- r Flood Limits PROPOSED STRUCTURAL IMPROVEMENTS
w y
• �- �_ � � _ Mulberry St. ;o River Bend Ponds
Floodwcy Limits
g Poudre River Master Drainageway Plan
X Sections o so soo Illy of Fort Collins
Ayr
es Associates
River Siotioning EDAW Inc.
-
n • :��.r,tiv,Y =e T"` j 26 Areas of Lateral Instabili!y NOTES:
--.x - For Location of Map See Index Figure 7.1.
�•� 'x' -' FDR 1 Flaod Da.ma a Reach
' g For Flood Elevations See Tables < 1-4.6.
_ Area Pholos From Aero Metrvc Engineering Inc.
33
/FDR"
FDR
= FDR --s ; �.R 26"
r.- : .l,` 7f
3 -
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1 APPENDIX F - MISCELLANEOUS CONSTRUCTION DETAILS
1
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PROVIDE EXPANSION JOINT
MATERIAL WHEN PLACING
PAD IN PAVEMENT
REPLACE EXISTING PAVEMENT
AND SUBGRADE AS SPECIFIED
BY OWNER -.
0.5% MIN. SLOPE
45' WYE
PROVIDE C.I. FRAME k LID,
NEENAH R-7514 WITH 'S'
CAST IN LID
4'THICK x 2'x2' CONCRETE PAD
WITH 6x6(10/1D) WWF
CLEANOUT ADAPTER FITTING
WITH THREADED PLUG
PVC RISER
45' BEND
COUPLING
PVC
COUPLING
PROVIDE WATERTIGHT PLUG IF
CLEANOUT IS AT END OF LINE
CLEANOUT DETAIL H
NOT TO SCALE
APPENDIX G - EROSION AND SEDIMENTATION CONTROL
I
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-EY-FpRMAf; fi- ,,Y;DAIzD EVENT..u. ATZON
1
MARCH 1991 -1
DESIGN CRITERIA
'
EFFECTIVENESS CALCULATIONS
-
PROJECT: STANDARD FORM B
YJ
COMPLETED BY: _ DATE: 73g eO
'
Erosion Control C-Factor P-Factor
Method Value Value Comment
Sam Gw�� a•o� 1 •�
RoaysfV�cawS o.o� l�
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r
MAJOR PS SUB -AIM—
BASIN ($) BASIN (AC) CALCULATIONS
r
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10-18
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1
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174q
EFF --Cejo. I
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Si7iN�LDI�� �M
MARCH 1991
6 46_
DESIGN CRITERIA
1
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IN F-A—I-L Ems' ^.E STANDApa EaAtUATaOx
I STANDARD —FORM A
(COMPLETED By..
DATE: -9
DEVELOP ERODIBILITY Asb Ls ss* Lb
SIIB$A IN ZONE (ac) {ftj Sb g
_ (g) (fee
A HOWRA-W 1.4.51 SOD
s 1Rm*- 1 ,47.ple I .qoo 1 1.sy.
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11.4 7
oo
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3.3 3
) 500
0.5%
E
MARCH 1991
1.34
zoo f Z.Ce
-4 -To ( 1.5aio, 119•4 ,
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=r-9CTr.-27.hvEss mLc-manoNs
PROJECT:
COMPLETED BY:DATE:
Erosion Control C-Factor P-Factor
Method Value Value Comment
5oD GRAsS 6.C.>I V oo
/ INAL14S 0.61 t • 0o
-vFMt,R4,4zY Fegt- ,z 6,45
rifPt-t.� 5"t-C�T"
e:P, A.\t rj—
t rAEJQ-V TtZA o. 50
MAJOR PS SUB AREA
BASIN ($) BASIN (Ac) CALCULATIONS
A
1�•St
c-F�r� = C.Ut.� o.o1)Ito 6t =o•za
C I - Co..1o)(oz3) = o. 9 j
PE:\t
Pv-D
13
= o. 01
C•
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.EC8 0Y-0.•5o 0t)) = 0.40
.40
GRADEJt
v
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I -- 60.4oXa•46)] o.Bz
pED
FAantt = 146.97 * o. ot) t(0.37 * 1.0biTh.5q =0.06
�95/
P Ft+crotz ; (o•SoXo . So) = 0.40
E.t:*= (o•4oyo.06)
t
G
Ll•t3
�Fr�Tata = (q.C3#o•45}/q.i3 �0 45
� =0Y•
'F'-1=AcTorz - D•$�,Yp..So) = O
D
3•Ilp
C Fwaar� = CCt.9b�to.oi i+ Cf 1< f.00)��3 (G=o.39
P--RF TOR Sod = 6.40
�o•SoiCo.
F-� 1 - (0A0y16•39)1 - o a4
j =tCbl.
G-Fiv--rom _ Q A 6 -W o.a t )/-3•,46 - o-
P- FAc nrz_ O.80X0• 60) -0.40
Eta _L I- (0-,40)(a o t )7 = p• 99
"19
EFFn[ttq•5f#o.g!){C°1.G�#0.98)+<8.1��o.gz,)-t•C'i.3q�<
' -Y C4.I +l o.g2) t C3,lb * 0.8�{) t 3.4� a.99}� `•
�--�
.
MARCH
1tl91
s DESIGN CRfTER►A
1
1
1
1
i
1
1
1
1
1
1
1
1
1
1
1
1
FORT COLLINS Date: 22-Nov-00
MULBERRY & LEMAY CROSSINGS By: J Holley
EROSION CONTROL COST ESTIMATE PHASE II CLC Job: 95.040
FORT COLLINS, COLORADO
Based on the Final Site Plan , this opinion includes erosion control improvements necessary for
site development as of September 29, 2000. CLC Associates, Inc. has no control over costs or
the price of labor, equipment, materials or the contractor's method of pricing. CLC Associates,
Inc. makes no warranty, expressed or implied as to the accuracy of such opinion as compared
to bid or actural costs.
No.
Description
Quantity
Unit
Cost
Total Cost
1
Gravel Inlet Filter
6
CY
$150.00
$900.00
2
Vehicle Tracking Control
120
CY
50.00
6,000.00
3
Silt Fence
1400
LF
2.50
3,500.00
4
Reseeding / Revegetation
13.53
AC
615.00
8,320.95
Subtotal:
$18,720.95
10% Contingency:
1,872.10
Total:
$20,593.05
z
1.4
w
E
0.�
0.2
0.a
0.15
0.10
0.05
0.00
Figure 8-A
ESTABLISHED GRASS AND C-FACTORS
FORT Coums, COLORM
U 20 40 60 80 1aa
ESTABUSHM GRASS GROUND COVER
MARCH 1991
e-s
DESIGN CRITERIA
PAGE 32
Curb tnl
(G"wtel Filter
'E�;O,s,eter) Wire Screen —
(Approv.)S N(esh)
1
I � �verflo+u -�
%now
1 M UZ�
Wire Screen
' VA4- Wood Stud
PLAN VIEW
SFLT70N A -A
1
General Notes:
1- Inspect and repair filters after each
' storm event. Remove sediment when
one half of the filter depth has been
filled. Removed sediment shall be de-
posited in an area tributary to a sedi-
ment basin or other filtering measure.
2. Sediment and gravel shall be immediately
removori frnm rravolari wad, of rnarte
7rr.ir3?r R i
❑.M
W*Ar
Inlet
CURB INLET FILTER
GRAVEL
CITY OF. -FORT COLLINSr COLORADO
STORMWATER UTILITY
RgV1Gf
:v ar:
DATE:
D-25
1�
1
1
1
1
11;
11
11
I. Excavate Trench,
44'Minirrium Dept.
q ga►w
W;dt4+
2. Place and Stake Straw
Bates
a BackfilI and Compact',, Excavated $oi l
Sleke --� % Straw B116
r
1 a
1 i aG,
filter'6d
Runoff l,, Runoff
�wqmmii I
►K4u ! ti 1
E'N
CROS"Ecriou VIEW
General Notes;
1- When used as a continuous perimeter
filter. barrier the maximum tributary
area is limited to 0.25 acres per 100
feet of bawler.
2. Inspect, repair, and replace
(if necessary) the filters after each
storm event.
I All bales must be replaced after 12
months unless approval is granted by
the Engineering Division for longer use.
I �►1�
STRAW BALE DIKE
GENERAL INSTALLATION
CITY OF FORT COLLINS, COLORADO
STORMWATER UTILITY
D-26
1
1
1
1
1
Sb00-1 orWood
Steel or ..
Wood Post
General Notes:
1. The maximum tributary area is limited
to 0.25 acres per 100 feet of fence.
2. Inspect and repair fence after each
storm event. Remove sediment when
one half the height of the fence has
been filled. Removed sediment shall
be deposited in an area tributary to a
sediment basin or other filtering
measure.
(IGnE (,_ 7
Filler Fabric
Bar-kfilled Trench
Filter Fabric
Aiiach 5ecurely +o Post
ATroximawy
4 x40 Tre►rtch
SILT FENCE
CITY OF. -FORT COLLINS, COLORADO
STORMWATER UTILITY
APPROVED BY:
DATE:
REVISIONS:
D-28
APPENDIX H - RIP -RAP CALCULATIONS
I
I
11
E
m!
){f
;f
aIL
�
�
�
0
12
66
a
!�«
D
;
W
\
2
,
.9
$
�
�
§
;
co
2
;
o
/{ƒ
m
6
0
ƒ%\
Go
2
0
§ w
!
DRAINAGE CRITERIA MANUAL
RIPRAP
tf"
Use Do instead of D whenever flow K supercritical in the barrel.
**Use Type L for a distance of 3D downstream,
FIGURE 5-7 RIPRAP EROSION .PROTECTION AT CIRCULAR
CONDUIT OUTLET.
I1-15-82
URBAN DRAINAGE S FLOOD CONTROL DISTRICT
DRAINAGE CRITERIA MANUAL
FtIPRAP
1
1
l
1
m
0 = Expansion Angle
�N■
�sa
TAILWATCR DEPTH/ CQNDU4T H-EIGHT,. Yt/D
FIGURE 5-9. EXPANSION FACTOR FOR CIRCULAR CONDUITS
� 1-15-82
URBAN DRAINAGE 9 FLOOD CONTROL DiSTRICT
DRAINAGE CRITERIA MANUAL
MAJOR DRAINAGE
Table 5-1
CLASSIFICATION AND GRADATION
Of ORDINARY R:,^nAR
R_i_prap
Designation
`4 Smaller Than
Given Size
Intermediate Rack
d*
50
Dimension
By Weight
(Inches)
(Inches)
Type VL
70-200
12
50-70
35.50
6
6**
2-10
2
Type L
70-I00
15
50-70
12
135-50
g
9**
2-10
3
Type M.
70-I00
.21
50-70
18
35-50
12
12
Z-10
4
Type H
100
30
50-70
24
35-50
18
18
2-10
b
Type YH
100
42
50-70
33
35-50
24
24
2-10
g
*d50 = !dean particle size
Bury types VL and L with native top soil and revegetate to protect
from vandalism.
5.2 Wire Enclosed Rock
Wire enclosed rock refers .to .rocks that are bound together in -a
wire basket so that they act as a single unit. One of the major
advantages of wire enclosed rock is that it provides an alternative in
situations where available rock sizes are too small for ordinary
ripra.p. Another advantage is the versatility that results from the
regular geometric shapes of wire enclosed rock. The rectangular
blocks and mats can.be- fashioned into almost any shape that can be
11-15.82
Appendix
Pond 2 Volume Calculations and Revised SWMM Models
£R'
0
l
I
I
1
I
1
Detention Stage - Storage Date: 4-Jul-2000
Job Name: Ft Collins - Mulberry and Lemay Crossings
Job Number: 95.040
I-rOM Lot 7
W. Pond E. Pond
Area of Area of Total Incremental Total Total h (3)
Elevation Contour Contour Area Volume Volume Ac-Ft (Tw depth-29.39)
25.5 19,850 1,074 20,924
11,342 11,342 0.26 0
26
22,781
1,756
24,537
27,243
38,585
0.89
0
27
27,133
2,965
30,098
32,848
71,433
1.64
0
28
31,427
4,318
35,745
38,620
110,053
2.53
0
29
35,848
5,799
41,647
,
47,758
157,811
3.62
0.61
30
40,414
13,828
54,242
6 8,950
226,761
5.21
1.61
31.
45,104
39,835
84,939
(3) Release calculated with the orifice equation considering the 10-year taitwater of 29.39 at the Poudre Outfall.
(4) Release calculated with orifice equation: Q=0.65A(2gh)12 using a 77'
pipe opening.
Rq'd Det Vol
From SWMM
2.8
4.2
Water Surface
Elevation
29.2
This Report
Detention Pond 2
'
W. Pond
E. Pond
Area of
Area of
Total
Incremental
Total _
Total
h (3)
Elevation Contour
Contour
Area
Volume
Volume
Ac-Ft
(Tw depth-29.39)
25.5 19,850
1,074
20,924
'
11,342
11,342
0.26
0
26 22,781
1,756
24,537
27,243
38,585
0.89
0
'
27 27,133
2,965
3D,098
32,848
71,433
1.64
0
28 31,427
4,318
35,745
37,463
108,896
2.50
0
29 33,629
6,765
39,284
'
46,946
156,842
3.58
0.61
30 36,649
18,500
55,149
78,643
234,485
5.38
1.61
31 39,414 65,528 104,942
(3) Release calculated with the orifice equation considering the 10-year tailwater of 29.39 at the Poudre Outfall.
(4) Release calculated with orifice equation: Q=0.65A(2gh)12 using a 72" pipe opening.
Rq'd Det Vol Water Surface
From SWMM Elevation
1�EV I Sip ' PER l.Or 4
manta-mok
10•year 2.8 29.3
100-year 4.2 30.3
b"WIA166.
0
%4t.l1Rmt> Denw71oN
Ut,r-R 4ED i3A51Ep onl
VOT 2 coi~isTR�� bN
L Rxwt&V.1! ,
Release (4)
(cfs)
0
0
0
0
115.2
187.2
Release (4)
(cfs)
0
0
0
0
115.2
187.2
I
fc10-2.SIN
1
2
1
1 2
3
4
WATERSHED
0
1
MULBERRY AND LEMAY CROSSINGS -
10-YR
RUNOFF
by CLC ASSOCIATES,
INC
60
0 0
5.0 1 1.0
1
1
24
0.49
5.0
0.56
0.65
1.09 1.39 2.69
4.87
2.02 1.21
0.71
0.60
0.52
0.39
0.37 0.35 0.34
0.32
0.31 0.30
0.29
0.28
0.27
0.26
0.25
1
446
799
67510.88 62
.005
.016 0.25
0.10 .30
0.51
.50 .0018
1
104
4
116515.06 78
.015
.016 0.25
0.10 .30
0.51
.50 .0018
1
1
106
6
73610.78 78
.015
.016 0.25
0.10 .30
0.51
.50 .0018
1
108
8
129018.04 76
.015
.016 0.25
0.10 .30
0.51
.50 .0018
1
110
10
242 3.16 62
.015
.016 0.25
0.10 .30
0.51
.50 .0018
1
5
446
104
106
108 110
5
446
104
106
108 110
0
799
870
0 1 3.0
550.
.0050
10.0
10.0
0.020 5.00
1
0
870
2
8 2
0.0
0.0 0.10
0.42
0.31
0.85
0.52 1.22
0.83
1.5 1.14
1.75
1.6
1.96
2.06 2.18
0
2
4
0 2 3.0
150.
.0023
0.0
0.0
0.013 4.00
1
0
4
3
0 2 5.0
800.
.0023
0.0
0.0
0.013 4.00
0
3
6
7 2 0.0
500.
.0023
0.0
0.0
0.013 4.00
0.0
0.0 0.1
0.0
0.22
0.0
0.58 17.0
1
0
1.01
6
9
35.3 1.16
0 2 4.5
1000.
39.2
.0035
1.26
0.0
80.0
0.0
0.013 4.00
0
8
9
0 2 5.0
1500.
.0053
0.0
0.0
0.013 4.00
0
10
9
0 2 2.5
1000.
.0051
0.0
0.0
0.013 4.00
0
9
11
7 2 0.0
500.
.0023
0.0
0.0
0.013 10.00
00001.64
0.0
1
.0.58115.2 8
187.20
k10
0 2 6.
655.
0031
0
8
co►ygiur�onl Dw,.�linlGS.
2
3
4
6 8 9
10
11
ENDPROGRAM
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€ Shsot Title
EROSION
CONTROL PLAN
C5.10
ANN SCREEN PLACED --
ARDOND CONCRETE
BLOCK PERIMETER
WIRE SCREEN AR::V,
PERMETER OF CONCF
BLOCKS TO PREVENT
MOVEMENT OF GRAN
CONCRETE BLOCKS
Y
TERIAI
D POSTS
FABRC MALRA:
ANCHORED IN MINCH
WOCO POST
ATTACHED TO FABRIC
OVERFLOW CONCRE1C Blr
WRL SCREEN " •Tw
PREVENT MDVTMEH
OE GRAVEL 10.
Ru4aF---'
WAMR
SECTION A A
GENERAL NOTES
1. Inspect and repair filters after each storm
event. Remove sediment when one halt of
the filter depth has been filled. Removed
2. sediment shall be deposited in an area
tributary to a sediment basin or other
filtering measure.
Sediment and grovel shall be Immediately
removed from traveled way of roads.
GRAVEL AREA INLET FILTER DETAIL �1
NoT TO SCALE ^
o
W..
WiC011[REIE u KS
OVERFLOW` 2'x� 1ypW STUD
WRE SCREEN /\1\
RUNCfE
PAVEMENT
IILffRED RUNOEE
CROSS-SECTION AA
NOTE: GRAVEL 0.RR CAN BE USED ON PAWMENT vR CAYE SVJUNJ
GENERAL NOTES
1. Inspect and repair filters after each storm
event. Remove sediment when one half of
the filler depth has been filled. Removed
2. sediment shall be deposited in an area
tributary to a sediment basin or other
filtering measure.
Sediment and gravel shall be immediately
removed from traveled way of roads.
GENERAL NOTES:
1. The maximum tributary area is limited to
0.25 acres per 100 feet of fence.
2. Inspect and repair fence after each storm
event. Remove sediment when one half the
height of the fence has been filled.
Removed sedminet Shall be deposited in on
area tributary to a sediment basin or other
filtering measure.
SILT FENCE DETAIL /;:�N
Filial
VEHICLE TRACKING CONTROL DETAIL\
v
APPROVED,
UTLDry PLAN APPROVAL
CHECKED BY
CITY EMaKrB
DAFT
o<IXFD BY:
WA1FA AND WAST ATEA UTILITY
DAR
CHECK D By
SMwMWAIER UTINTY
DIRE
CHECKED BY:
PAWS AND 1EmEA11M
DAM
OECKED IT
TABLE 5-4
THICKNESS REOIARENTENTS FOR GRANILAR BEDDING
MINIMUM BEDDING THICKNESS
(INCHES)
RIPRAP
FINE GRAINED SOILS •
COURSE GRAINED SOILS
DESIGNATION
TYPE 1
TYPE 2
TYPE 3
L. G, SM
4
4
6
M
4
4
6
H
4
6
8
VN
4
6
8
• MAY SUBSTITUTE ONE 12 INCH LAYER OF TYPE 2 BEDDING. SUBSTITUTION OF ONE
LAYER OF TYPE 2 BEDDING SHALL NOT BE PERMITTED AT DROP STRUCTURES. USE
OF A COMBINATION OF FILTER FABRIC AND TYPE 2 BEDDING AT DROP STRUCTURES IS
ACCEPTABLE. SEE SECTION 5.3.2 FOR USE OF FILTER FABRIC AT DROP STRUCTURES.
• FIFTY PERCENT OR MORE BY WEIGHT RETAINED ON THE 040 STEW.
RAP A
ELAN
YEW
t GRANULAR BEDDING, —(
TYPE 1 OR 2�
(SEE TABLE 5-4)
i
NOT USED 0
TABLE 5-1
CLASSIFK]ATION AND GRADATION CIF 11RMUARV RIRRAR
RIPRAP
% SMALLER THAN
INTERMEDIATE ROCK
2
DESIGNATION
GIVEN SIZE BY WEIGHT
DIMENSION (INCHES)
(INCHES)
ID-100
12
TYPE VL
50-70
9
6 „
35-50
6
2-10
2
TO-100
15
TYPE L
50-70
12
9 „
35-50
9
2-10
3
20-100
21
TYPE M
50-20
10
12
35-50
12
2-10
4
IN
30
TYPE H
50-70
24
18
35-50
18
2-10
6
IN
42
TYPE TN
50-70
33
24
35-50
24
2-10
9
• tlSO MEAN PARTICLE SIZE
BURY TYPES "W' AND 'L' NTH NATIVE TOP SOIL AMU REVEGETATE TO
PROTECT FROM VANDAITSM.
TABLE 5-3
GRADATION FOR GRANUI AR RFDTHNiR
U.S.
STANDARD
SIEVE SIZE
PERCENT WEIGHT
BY PASSING
TYPE 1
SQUARE MESH
SIEVES
TYPE 2
S
90-100
1-1/2
3/4-
-
20-90
3/W
100
-
/4
95-iW
0-20
EI6
45-N
-
B50
10-30
8100
2-10
-
A200
0-2
0-3
E1pBgR rAIrINOI leONpM. tat•
AREAS ARE TO BE RESEED AND MULCHED ACCORDING TO CFl & NOTE 4,
SEED Mix
SPECIES VARIETY 'DRILLED LBS. OF PLS / ACRE
FAIRWAY CRESTED WHEAT 7.2
CRESTED 4MEATMASS CRITANA 11 5
INTER. YMEATGRA55 AMUR, OAHE 24,8
WESTERN WEATGRASS AROMA. BARTON 19.0
BLUE MAMA LONNGTON 3.0
SMOOTH BROME LINCOLN 16A
GREEN NEEDLEGRASS LOIXAi4 12.1
• PLS . PURE LIVE SEED. ORILLED RATES ARE FOR SLOPES 4:1 ON LESS AND
FAWRABLE TOPSOIL. BROADCAST RATES OF SEED ON 4A OR STEEPER WLL BE
DW$ ME DRILLED RAZES.
CRASS SEED SHALL BE DRILLED TO A PLANTING DEPTH OF I/4 INCH TO h INCH. ROW
SPACING SMALL NOT EXCEED 8 INCHES FOR THE MASS DRILL. DRILL SHALL HAVE A
CULDRACNER CN OTHER METHOD Or FIRMING THE SOL OWN THE SEED.
SOl AIE9AMTE11 : SEED AREAS SHALL BF GRADED TO ME LINES AND GRADES SUDAN
ON THE PUGS. THE SEED BE 0 SHALL BE FRIABLE ENOUGH TO ALLOW SEED TO BE PLACED
AT THE PROPER DEPTH,
SEES THAT ARE NOT FRIABLE DUE TO TRAFFIC OR HEAVY EQUIPMENT SHALL BE RIPPED OR
TIMED TO III UP RESTRICTIVE LAYERS AND THE HARROWED OR RIXLEO TO FIRM ME
SIDED BED. TREIPREPARED SURFACE SHAu BE RELATIVELY FREE FROM NEEDS. CLWS.
STONES, ROOTS.MSTOKS. IBWLETA AMID GUI
SEED SMALL BE'SDWN. ORN IED OR OTHERWISE PLANTED MEN ME SOIL IS FROZEN OR
DOUBTED OR NHEB R Of MOST 1WDY.
ALL ALL K AREAS WM MAY OR STRAW AT ME APPLICATION RACE OF l
I Y qt STRAW MULCN SHALL BE FREE OF NOXIOUS WEEDS AND AT LEAST
SMALL BE 10 INCHES OR MME IN LENGTH.
ALL $EmED $HALL BE MULCHED WHIN 24 HOURS AFTER SEEDING. HAY OR STRAW
MULCN SINE ANCHOMD TO ME SEAL BY USE OF A CRIMPER. THE FIBER SHALL BE
CRINPEO FOOD ES ON MORE INTO ME SpL.
PROTECTION Cf � AREAS : APPROPRIATE WARNING SIGNS AND BARRIERS SHALL SE
ERECTED WHFRESNECESSARY TO HELP PROTECT SEEDED AREAS FROM DAMAGE BY
VEHICLE OR PEDESTRIAN TRAFFIC.
TIAFTIC DAMAGE AND VANDALISM MAT MAY OCCUR WRING ME FIRST TWO GROWING
SEASCNS SHALIBE REPAIRED.
BNIIEMNKE : THE (ROPER SMALL BE RESPONSIBLE FOR THE CONTROL OF WEEDS BY
40MNG W AP YANG HERBIOBE AT PROPER TIMES OF ME YEAR. ME OWER IS
RESPONSIBLE T TIFET ME REaUNDENTS O ME NEEDS, BRUSH, AND RUBBISH
O ONAMCE.
ADDERMA ICE: (SEEDED AREAS SHALL EVALUATED AFTER WE GROWING SEASW TO
CEIDNEK NEjHEp ADgTgHA MAINTENANCE AMID / OR NEED CONTR0. IS REWIRED.
ACCEPTANCE M SEEDED AREAS AFTER ME SECOND GROWNG SEASON SHALL DEPEND
UPOFI WHETHER SATISFACTORY STAND OF GRAS IS EVIDENT AND NEEDS HAW BEEN
CWTRO LM A SATISFACTORY STAND O GRASS IS WHERE 90% O ME SEEDED AREA HAS
AN EVENLY DISTNBUTE) CRASS SURFACE.
PREPARED UNDER THE NINCT
SUPERNABADE? OF
NO 15001
FOR AND ON BEHALF Of
9
8
Raw Nurrbr: 95.040
Bruin By.
JET
IIeNgI•d By
SC
0NA9E0 By
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EROSION
CONTROL
DETAILS
C5.90
s .Sheet Number
OAR