HomeMy WebLinkAboutDrainage Reports - 08/22/1994CA
EROSION AND SEDIMENTATION CONTROL
REPORT AND SPECIFICATIONS
COVENTRY SUBDIVISION FILING NO. 1
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EROSION AND SEDEMENTATION CONTROL
REPORT AND SPECIFICATIONS
COVENTRY SUBDIVISION FILING NO. 1
Prepared for:
COLORADO LAND SOURCE, LTD.
8101 E. PRENTICE AVE., SUITE # M - 180
ENGLEWOOD, COLORADO 80111
MARCH 1994
APRIL 7, 1994 REVISION
NNE 1, 1994 REVISION
AUGUST 1994 REVISION
Prepared by:
JR ENGINEERING, LTD.
4812 S. COLLEGE AVENUE
FORT COLLINS, COLORADO 80525
Job Number 9007.00
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JREngineering, Ltd.
4812 South College Avenue
Fort Collins, Colorado 80525
(303) 282-4335 - FAX (303) 282-4340
August 3, 1994
Mr. Glen Schlueter
City of Fort Collins
Stormwater Utility
235 Mathews
Fort Collins, CO 80522-0580
' RE: Coventry Filing No. 1 - Phase 1
Fort Collins, CO
4935 North 30th Street
Colorado Springs, Colorado 80919
(719) 593-2593 - FAX (719) 528-6613
6110 Greenwood Plaza Blvd.
Englewood, Colorado 80111
(303) 740-9393 • FAX (303) 721-9019
' Dear Glen:
This letter is in response to the meeting held in your office on Monday, July 18, 1994. This meeting
' was held at the request of Mr. James R. McCory, the managing member of McGraw Land L.L.C.,
a Colorado Limited Liability Company. In attendance at that meeting were the following:
City of Fort Collins
Glen Schlueter
Basil Hamdan
McGraw Land L.L.C.
James R- McCory
Roger Prenslo
Jr Engineering, Ltd.
Dick Kellogg
Eldon Strong
This meeting was requested to discuss the Coventry Filing 1 project, delays to the project and to set
the course to complete the project. Subsequent to discussion, the following was agreed upon, in
order to allow Mr. McCory to maintain momentum and start construction (overlot grading) on the
Coventry:
1. JR Engineering, Ltd. is to prepare a set of construction documents for a "Phase 1"
construction. Phase 1 includes the twelve (12) lots along Crest Road, the detention
pond, and the necessary drainage Swale from the. Hinsdale Drive cross lateral
discharge (from the west side to the east side of Hinsdale Drive) which will redirect
drainage discharge historically draining to the southeast comer of the site to the
detention pond at the northeast comer of the site. The area of the redirected drainage
is 10.52 acres. This was agreed to along with approval of the Erosion Control Study
and Construction Plan. With the approval of the Phase 1 construction plans, a
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Recycled
' Mr. Glen Schlueter
August 1, 1994
Page 2
Development Agreement for Phase 1 will be prepared by the City of Fort Collins and
' approved, allowing full development of all infrastructure of the twelve (12) lots
fronting Crest Road.
2. JR Engineering, Ltd. will follow-up the Phase 1 plans with completed plans and
drainage study including the proposed Ridgeview Park site plan for the remaining
portions of the subdivision for review and approval.
' 3. In a subsequent meeting with Glen Schlueter and Basil Hamdan, Dick Kellogg was
informed that a "Memorandum of Agreement" for overlot grading of the entire site
could be obtained upon approval of the Erosion Control Study and Construction
Plans. This agreement would be an "it risk" agreement by the developer, and also
t was conditional upon payment of the Erosion Control fee deposit. This meeting was
late in the afternoon of July 19, 1994. This means that along with the approval of the
Phase 1 plans which includes erosion control measures and study, the remainder of
' the Coventry Filing 1 can be graded with the additional "Memorandum of
Agreement".
By this letter we are submitting for approval, the Phase 1 construction plans for the twelve (12) lots
fronting Crest Road, the detention pond construction, and the drainage swale from Hinsdale Drive
northeasterly over City of Fort Collins Parks and Recreation property to the. detention pond.
' Additionally, we are requesting approval of the Erosion Control Study and Construction Plan,
allowing the "Memorandum of Agreement - At Risk" for the overlot grading of the remainder of the
project to take place.
You will note that basin summaries for drainage have not been shown or included in the attached
plans. We received word from fun Sell Design that some of the athletic fields may be revised and/or
' relocated which could cause change to the final drainage study and flow volumes and discharges.
It was requested by Stormwater Utility during the meeting, that JR Engineering, Ltd., compare and
demonstrate that the time of concentration for the four (4) northerly lots releasing drainage
undetained into Mail Creek would not interfere with the peak flow for Mail Creek.
' The attached calculations for the four (4) lots (Lots 73, 74, 75 and 76) releasing undetained flows
occurs with a Time -of -Concentration of approximately 14 minutes with a peak flow Q(100) = 3.61
cfs. Review of the Water Engineering Technology, Inc. study for Mail Creek at Element 16 (Crest
Rd.) shows a Time -of -Concentration of 48 minutes with a peak discharge of 605 cfs.
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' 9007.01
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' Mr. Glen Schlueter
August 1, 1994
Page 3
The conclusion is that the undetained discharge from four (4) lots whose area is 1.07 acres is less than
' one percent of the Mail Creek peak discharge at Crest Road, and occurs approximately 34 minutes
before the Mail Creek peak. (A copy of pages 31, 32 and 33 of the Water Engineering &
Technology, Inc. report, dated Monday, July 15, 1991 is attached for your review. Additionally a
' copy of their 24 X 36 Basin Hydraulic Information drawing is attached along with the undersigned's
calculations for Lots 73, 74, 75 and 76 discharging undetained into Mail Creek.)
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We would appreciate your review and approval of the Phase 1 Construction Plans, the Erosion
Control Study and Construction Plan, and approval for the "Memorandum of Agreement - At Risk"
for the overlot grading of the remainder of the Coventry Filing 1 project.
If you have any questions related to any part of the above, please contact the undersigned, as soon
as possible.
xoger rrenslo
9007.01
TABLE OF CONTENTS
PAGE
CERTIFICATIONS.........................................................1
INTRODUCTION..........................................................2
GENERAL LOCATION AND DESCRIPTION .................................... 2
SOIL DESCRIPTION........................................................3
EROSION AND SEDIMENT CONTROL MEASURES .............................. 3
DUST ABATEMENT........................................................3
TRACKING ON CITY AND/OR COUNTY STREETS .............................. 4
MAINTENANCE...........................................................4
PERMANENT STABILIZATION .............................................. 4
APPENDIX................................................................5
- EROSION CONTROL DESIGN
- CALCULATIONS AND SCHEDULE
MAP (See Map Pocket)
Erosion and Sedimentation Control Plan
CERTIFICATION
"This plan for the Final Erosion Control design of the Coventry Subdivision Filing No. 1 was
prepared by me (or under my direct supervision) in accordance with the provisions of the City of Fort
Collins Storm Drainage Design Criteria and Construction Standards, for the owners thereof.
I understand t the ty ��+tmro� s does not and will not assume liability for drainage and
erorion cont I facilitie .d�"! � 09 e it
�P
Colorado R gistered Pri
For and on Behalf of JR
9265
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71�1,V4
Date
' INTRODUCTION
' This report represents an Erosion and Sedimentation Control Report for The Coventry Subdivision
Filing No. 1 and the Ridgewood Park, and was prepared to meet the regulatory requirements of the
City of Fort Collins, Colorado. This report was prepared following guidelines and regulations within
' the "City of Fort Collins Storm Drainage Design Criteria and Construction Standards, dated May
1984".
' This report addresses Erosion and Sedimentation Control measures to minimize soil loss during the
site construction activities until final landscaping and erosion control measures are in place.
GENERAL LOCATION AND DESCRIPTION
The Coventry Subdivision Filing No. 1 and the Ridgeview Park are located in the north one-half of
Section 2, Township 6 North, Range 69 West of the Sixth Principal Meridian in the City of Fort
tCollins, Colorado (see Vicinity Map in Appendix).
This subdivision and the park are bounded on the west by the Front Range Community College,
' Clarendon Hills Subdivision to the south, McGraw Elementary School to the east, and Harmony
Road to the north.
The site is comprised of approximately 53.82 acres as follows:
0
McGraw Elementary School 7.31
Ridgewood Park (City of Fort Collins) 14.46
and misc. street areas
Coventry Subdivision 28.70
Mail Creek Wetland and Drainage way 3.35
(City of Fort Collins)
The undeveloped areas of the subdivision, park, and drainage way are primarily covered with native
grasses. There are existing irrigation facilities and a major drainage way on -site. The site was
originally an apple orchard. The majority of the site drains in a northeasterly direction at slopes
ranging from 1 to 4 percent.
There are 84 single family lots proposed for Filing No. 1' on this site.
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' SOIL DESCRIPTION
In accordance with the Soil Conservation Service's (SCS) "Soil Survey of Fort Collins Area,
' Colorado", (copy reproduced in Appendix) the soils on -site consist of the following:
Hydrologic Rainfall Wind
'
Soil Designation Erodibility Zone Erodibility Zone Soil Group
' Altvan-Satanta Loams Moderate Moderate B
Nunn Clay Loams Moderate Moderate B
EROSION AND SEDIMENT CONTROL MEASURES
Erosion and Sedimentation will be controlled on -site by use of silt fences, inlet filters, and soil
grooving of the overlot graded site. See the attached erosion control plan for details. Calculations
documenting the overall effectiveness of the erosion control measures are shown in the Appendix.
The measures are designed to limit the overall sediment yield increase due to construction as required
' by the City of Fort Collins. A construction schedule is contained in the Appendix which shows
overlot grading starting August, 1994.
' Site fences will be used in limited areas to surround any stripping stockpiles that are created during
overlot grading. They will also be used to slow runoff around the perimeter of the site. Inlet filters
are proposed at the existing curb inlets in Hinsdale Drive to intercept sediments from the street before
' they enter the storm sewer system. Soil grooving will be used on steeper slopes to reduce wind and
runoff erosion on the site.
Immediately upon completion of overlotting, utility relocation will begin. Approximately 3 weeks
after that, upon acceptance by the water and sanitation districts, house construction may start prior
to completion of street improvements. Any lot with a house under construction will not require
seeding and mulching but will implement other on -site erosion measures.
DUST ABATEMENT
During the performance of the work required by these specifications or any operations appurtenant
thereto, whether on right-of-way provided by the City or elsewhere, the contractor shall firnish all
' labor, equipment, materials, and means required. The Contractor shall carry out proper efficient
measures wherever and as necessary to reduce dust nuisance, and to prevent dust nuisance, and to
prevent dust which has originated from his operations from damaging crops, orchards, cultivated
' fields, and dwellings, or causing a nuisance to persons. The Contractor will be held liable for any
damage resulting from dust originating from his operations under these specifications on right-of-way
or elsewhere.
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' TRACKING MUD ON CITY STREETS
It is unlawful to track or cause to be tracked mud or other debris onto city streets or rights -of -way
unless so ordered by the Director of Engineering in writing. Wherever construction vehicles access
routes or intersect paved public roads, provisions must be made to minimize the transport of sediment
(mud) by runoff or vehicles tracking onto the paved surface. Stabilized construction entrances are
1 required per the detail shown on the Plan, with base material consisting of 6" coarse aggregate.
MAINTENANCE
All temporary and permanent erosion and sediment control practices must be maintained and repaired
as needed to assure continued performance of their intended function. Straw bale dikes or silt fences
will require periodic replacement. Sediment traps (behind hay bale barriers) shall be cleaned when
accumulated sediments equal about one-half of trap storage capacity. Maintenance is the
responsibility of the developer.
PERMANENT STABILIZATION
A vegetative cover shall be established within one and one-half years on disturbed areas and soil
stockpiles not otherwise permanently stabilized. Vegetation shall not be considered established until
a ground cover is achieved which is demonstrated to be mature enough to control soil erosion to the
satisfaction of the City Inspector and to survive severe weather conditions.
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APPENDIX
EROSION CONTROL DESIGN
CALCULATIONS AND SCHEDULE
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LOPEZ
ELEMENTARY
RD.
9 Q
W FRONT RANI
y COMMU�NITY
HINSDALE DR.
PROJECT
CITY LIMITS
VICINITY MAP
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SCS SOILS MAP
NM
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WIND EROSION MAP
NM
JR Engineering, Ltd.
4812 South College Avenue, Fort Collins, Colorado 80525
RAINFALL PERFORMANCE STANDARD EVALUATION
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(303) 282-4335
STANDARD FORM A
PROJECT: COVENTRY FILING NO. 1
COMPLETED BY: R.M. Kellogg, Jr. DATE: 01-Aug-94
DEVELOPED
ERODIBILITY
Asb
Lab
Ssb
Lb
Sb
PS
SUBBASIN
ZONE
Lac)
R
y.
g
96
1
Moderate
2.98
780
1.4
1.1
Moderate
0.47
73D
1.4
1.11A
Moderate
0.31
2DD
1.4
1.18
Moderate
2.08
700
2.0
1.1 C
Moderate
1.12
32D
2.0
2
Moderate
2.86
135D
1.5
21
Moderate
4.53
900
1.7
21A
Moderate
3.13
870
1.6
2A
Moderate
1.14
72D
1.0
3,
Moderate
4.21
540
21
4
Moderate
7.94
820
1.2
4.1
Moderate
2.7
710
1.2
5
Moderate
0.56
45D
0.8
5.1
Moderate
2.92
52D
0.8
6
Moderate
1.19
49D
0.6
6.1
Moderate
2.71
600
0.6
OSHA
Moderate
1.03
655
2.0
OS-1 B
Moderate
1.63
680
2.0
OS-2A
Moderate
1.09
50D
20
OS-2B
Moderate
1.91
42D
2.0
St
Moderate
3.73
S2
Moderate
0.56
S3
Moderate
2.86
S4
Moderate
0.16
70
1.4
46•67 1
724.6
1.5
79.7
PS is taken from Table 8-A (Table 5.1, Erosion Control Reference Manual) by interpolation
Therefore, an Erosion Control Plan will be developed to contain 79.7% of the rainfall sedi-
ment that would normally flow off a bare ground site during a 10-year, or less precipitation
event.
S1, S2, and S3 are not included in calculations since these areas are developed as McGraw School and
will not be disturbed during the Coventry Filing 1 construction.
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I I I t 1 1 1 1 t 1 1 1 t7tancntstAAAAAWWWNNr? i W j
I t l 1 1 1 1
t 1 1 1 1 Of CJf W I.+ %0 -.j " 0% 1.+ cn 0 1 1
OtOAcnwmatwmbmlrmytn:7 1 0 1
1 1 1 1 1 1 1 1 t I I I I
I I I I V V010t 0ttnaAWN? I I I I I I I t t 1 1 t t 1 1
1 1 wWbto OCatbNWA� 1 1 1 1 1 1 1 1 1 1 t 1 1 1 1 t l l l mNaNOtA :n y%00%
t
1 1 I l l l t f l l l l l l l l l l( l l l l l
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 t 1 1 1 1 V Ot at M ca
1 1 1 1 Otm OtOao
1 1 1 1 t 1 1/ 1 1 1 1 1 1 1 1 1 1 1..•m•••A0t0 1 0 1
1
1 1
..N
I
[1
[_1
t
1
Table 813 C-Factors and P-Factors for Evaluating EFF Values.
Treatment
C-Factor
P-Factor i(
BARE SOIL
Packedand smooth................................................................
1.00
1.00
Freshlydisked........................................................................
1.00
0.90
Rough irregular 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 ....................................
0.4512)
1.00
HYDRAULIC MULCH @ 2 TONS/ACRE...........................................
0.10(31
1.00
SOIL SEALANT....................................................................0.01-0.60(41
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 olantino grass seed, apply mulch at a rate of 2 tons/acre Iminimum) and adequately anchor,
tack or crimp material into the soil.
Slope M
1
to
05.............................................................................0.06
1.00
6
to
10.............................................................................
0.06
1.00
11
to
15.....................:.......................................................
0.07
1.00
16
to
20.............................................................................
0.11
1.00
21
to
25.............................................................................
0.14
1.00
25
to
33.........................................................................0.17
1.00
> 33 ..........................................................................
0.20
1.00
NOTE: Use of other C-Factor or P-FactDr values reported in this table must be substantiated by documentation.
11) 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 1991 8-6 DESIGN CRITERIA
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Figure 8-A
ESTABLISHED GRASS AND C—FACTORS
FORT COumss COLORADO
0.35
0.30
0.25
0.20
h
0
W
0.10
0.05
0.00
0 20 40 60 80 100
Z;TABUSgID GRASS GROUND COVER W
MARCH 1991 8-8 DESIGN CRITERIA
' JR Engineering, Ltd. (303) 282-4335
4812 South College Avenue, Fort Collins, Colorado 80525
[]
1
1
[I
1
1
EFFECTIVENESS.CALCULATIONS STANDARD FORM B
PROJECT: THE COVENTRY SUBDIVISION
COMPLETED BY: RMK DATE: 01-Aug-94
EROSION CONTROL C-FACTOR P-FACTOR
METHOD VALUE VALUE COMMENT
BARE SOIL 1.00 1.00 SMOOTH CONDITION
ROUGHEN GROUND 1 AO 0.90
SEDIMENT TRAP 1.00 0.50 FOR ALL SUBBASINS
ROADSIWALKS 0.01 1.00 FOR ALL SUBBASINS
GRAVEL FILTERS 1.00 0.80 FOR ALL SUBBASINS
SILT FENCE 1.00 0.50
TEMPORARY CROP 0.45 1.00
HAY MULCH 0.06 1.00
ESTABLISHED GRASS 0.08 1.00 FOR ALL SUBBASINS
MAJOR
PS
SUB
AREA
BASIN
(0/0)
BASIN
i (Ac)
CALCULATIONS AC
79.4
1
2.98
ROADS/WALKS 0.73
ESTABLISHED GRASS 1.60
ROUGHENED GROUND 0.65
WEIGHTED C-FACTOR 0.26
WEIGHTED P-FACTOR 0.40
EFF 89.46
1.1
0.47
ROADS/WALKS 0.10
ESTABLISHED GRASS 0.33
ROUGHENED GROUND 0.04
WEIGHTED C-FACTOR 0.14
WEIGHTED P-FACTOR 0.40
EFF 94.50
LIA
0.31
ROADS/WALKS 0.31
ESTABLISHED GRASS 0.00
ROUGHENED GROUND 0.00
WEIGHTED C-FACTOR 0.01
WEIGHTED P-FACTOR 0.40
EFF 99.60
LIB
2.08
ROADS/WALKS 0.10
ESTABLISHED GRASS 1.88
ROUGHENED GROUND 0.10
WEIGHTED C-FACTOR 0.12
WEIGHTED P-FACTOR 0.40
EFF 95.19
A:\327000\W0RKSHTS\SF-B1.WK3 - 08/01/94 - 17:18:00
JR Engineering, Ltd. (303) 282-4335
4812 South College Avenue, Fort Collins, Colorado 80525
1
11
EFFECTIVENESS CALCULATIONS STANDARD FORM B
PROJECT: THE COVENTRY SUBDIVISION
COMPLETED BY: RMK DATE: 01-Aug-94
EROSION CONTROL C-FACTOR P-FACTOR
METHOD VALUE VALUE COMMENT
BARE SOIL 1.00 1.00 SMOOTH CONDITION
ROUGHEN GROUND 1.00 0.90
SEDIMENT TRAP 1.00 0.50 FOR ALL SUBBASINS
ROADSIWALKS 0.01 1.00 FOR ALL SUBBASINS
GRAVEL FILTERS 1.00 0.80 FOR ALL SUBBASINS
SILT FENCE 1.00 0.50
TEMPORARY CROP 0.45 1.00
HAY MULCH 0.06 1.00
ESTABLISHED GRASS 0.08 1.00 FOR ALL SUBBASINS
MAJOR
PS
SUB
AREA
BASIN
(%)
BASIN
(Ac)
CALCULATIONS AC
LIC
1.12
ROADSIWALKS 0.10
ESTABLISHED GRASS 0.97
ROUGHENED GROUND 0.05
WEIGHTED C-FACTOR 0.12
WEIGHTED P-FACTOR 0.40
EFF 95.37
2
Z86
ROADSIWALKS 0.83
ESTABLISHED GRASS 1.22
ROUGHENED GROUND 0.81
WEIGHTED C-FACTOR 0.32
WEIGHTED P-FACTOR 0.40
EFF 87.16
2.1
4.53
ROADSIWALKS 1.15
ESTABLISHED GRASS 2.03
ROUGHENED GROUND 1.35
WEIGHTED C-FACTOR 0.34
WEIGHTED P-FACTOR 0.40
EFF 86.53
ZIA
3.13
ROADS(WALKS 0.48
ESTABLISHED GRASS 1.59
ROUGHENED GROUND 1.06
WEIGHTED C-FACTOR 0.38
WEIGHTED P-FACTOR 0.40
EFF 94.77
2A
1.14
ROADSIWALKS 0.10
ESTABLISHED GRASS 0.62
ROUGHENED GROUND 0.42
WEIGHTED C-FACTOR 0.04
WEIGHTED P-FACTOR 0.40
EFF 98.21
A\327000\W0RKSHTS\SF-B1.WK3 - 08/01/94 - 17:16:29
' JR Engineering, Ltd. (303) 282-4335
4812 South College Avenue, Fort Collins, Colorado 80525
1
i
1
EFFECTIVENESS CALCULATIONS
PROJECT: THE COVENTRY SUBDIVISION
COMPLETED BY: RMK DATE: 01-Aug-94
EROSION CONTROL C-FACTOR P-FACTOR
METHOD VALUE VALUE COMMENT
BARE SOIL 1.00 1.00 SMOOTH CONDITION
ROUGHEN GROUND 1.00 0.90
SEDIMENT TRAP 1.00 0.50 FOR ALL SUBBASINS
ROADSIWALKS 0.01 1.00 FOR ALL SUBBASINS
GRAVEL FILTERS 1.00 0.80 FOR ALL SUBBASINS
SILT FENCE 1.00 0.50
TEMPORARY CROP 0.45 1.00
HAY MULCH 0.06 1.00
ESTABLISHED GRASS 0.08 1.00 FOR ALL SUBBASINS
MAJOR
PS
SUB
AREA
BASIN
BASIN
(Ac)
CALCULATIONS AC
3
4.21
ROADS/WALKS 0.38
ESTABLISHED GRASS 3.06
ROUGHENED GROUND 0.77
WEIGHTED C-FACTOR 0.24
WEIGHTED P-FACTOR 0.40
EFF 90.36
4
7.94
ROADS/WALKS 0.10
ESTABLISHED GRASS 7.06
ROUGHENED GROUND 0.78
WEIGHTED C-FACTOR 0.17
WEIGHTED P-FACTOR 0.40
EFF 93.20
4.1
17
ROADS/WALKS 0.81
ESTABLISHED GRASS 1.13
ROUGHENED GROUND 0.76
WEIGHTED C-FACTOR 0.32
WEIGHTED P-FACTOR 0.40
EFF 87.34
5
0.56
ROADS/WALKS 0.27
ESTABLISHED GRASS 0.17
ROUGHENED GROUND 0.12
WEIGHTED C-FACTOR 0.24
WEIGHTED P-FACTOR 0.40
EFF 90.53
5.1
192
ROADSIWALKS 0.46
ESTABLISHED GRASS 1.48
ROUGHENED GROUND 0.98
WEIGHTED C-FACTOR 0.04
WEIGHTED P-FACTOR 0.40
EFF 98.32
A\327000\W0RKSHTS\SF-61.WK3 - 08/01/94-17:15:36
' JR Engineering, Ltd. (303) 282-4335
4812 South College Avenue, Fort Collins, Colorado 80525
1
1
1
I
EFFECTIVENESS CALCULATIONS
PROJECT: THE COVENTRY SUBDIVISION
COMPLETED BY: RMK DATE: 01-Ang-94
EROSION CONTROL C-FACTOR P-FACTOR
METHOD VALUE VALUE COMMENT
BARE SOIL 1.00 1.00 SMOOTH CONDITION
ROUGHEN GROUND 1.00 0.90
SEDIMENT TRAP 1.00 0.50 FOR ALL SUBBASINS
ROADS/WALKS 0.01 1.00 FOR ALL SUBBASINS
GRAVEL FILTERS 1.00 0.80 FOR ALL SUBBASINS
SELT FENCE 1.00 0.50
TEMPORARY CROP 0.45 1.00
HAY MULCH 0.06 1.00
ESTABLISHED GRASS 0.08 1.00 FOR ALL SU13BASINS
MAJOR
PS
SUB
AREA
BASIN
(°h)
BASIN
(Ac)
CALCULATIONS AC
6
1.19
ROADS/WALKS 0.30
ESTABLISHED GRASS 0.33
ROUGHENED GROUND 0.36
WEIGHTED C-FACTOR 0.34
WEIGHTED P-FACTOR 0.40
EFF 86.50
6.1
171
ROADS/WALKS 0.30
ESTABLISHED GRASS 1.45
ROUGHENED GROUND 0.96
WEIGHTED C-FACTOR 0.40
WEIGHTED P-FACTOR 0.40
EFF 84.02
OS -IA
1.03
ROADS/WALKS 0.10
ESTABLISHED GRASS 0.56
ROUGHENED GROUND 0.37
WEIGHTED C-FACTOR 0.41
WEIGHTED P-FACTOR 0.40
EFF 83.78
OS-113
1.63
ROADS/WALKS 0.42
ESTABLISHED GRASS 0.73
ROUGHENED GROUND 0.48
WEIGHTED C-FACTOR 0.34
WEIGHTED P-FACTOR 0.40
EFF 86.59
OS-2A
1.09
ROADS/WALKS 0.10
ESTABLISHED GRASS 0.59
ROUGHENED GROUND 0.40
WEIGHTED C-FACTOR 0.41
WEIGHTED P-FACTOR 0.40
EFF 83.69
A:\327000\W0RKSHTS\SF-B1.WK3 - 08/01/94 - 17:14:30
' JR Engineering, Ltd. (303) 282-4335
4812 South College Avenue, Fort Collins, Colorado 80525
1
1
1
1
1
1
11
1
1
1
EFFECTIVENESS CALCULATIONS
STANDARD FORM B
PROJECT:
THE COVENTRY SUBDIVISION
COMPLETED BY:
RUX
- DATE:
01-Au -94
EROSION CONTROL
C-FACTOR
P-FACTOR
METHOD
VALUE
VALUE
COMMENT
BARE SOIL
1.00
1.00
SMOOTH CONDITION
ROUGHEN GROUND
1.00
0.90
SEDIMENT TRAP
1.00
0.50
FOR ALL SUBBASINS
ROADS/WALKS
0.01
1.00
FOR ALL SUBBASINS
GRAVEL FILTERS
1.00
0.80
FOR ALL SUBBASINS
SILT FENCE
1.00
0.50
TEMPORARY CROP
0.45
1.00
HAY MULCH
0.06
1.00
ESTABLISHED GRASS
0.08
1.00
FOR ALL SUBBASINS
MAJOR
PS
SUB
AREA
BASIN
(%)
BASIN
(Ac)
CALCULATIONS
AC
OS-2B
1.91
ROADS/WALKS
0.43
ESTABLISHED GRASS
0.89
ROUGHENED GROUND
0.59
WEIGHTED C-FACTOR
0.35
WEIGHTED P-FACTOR
0.40
EFF
96.02
84
0.16
ROADS/WALKS
0.15
ESTABLISHED GRASS
0.01
ROUGHENED GROUND
0.00
WEIGHTED C-FACTOR
0.04
WEIGHTED P-FACTOR
0.40
EFF
98.51
TOTAL
46.67
99.75
Since 89.75 is greater than 79.7, the proposed plan is adequate.
C
A\327000\W0RKSHTS\SF-l31.WK3 - 08/01/94-17:25:47
C01ffSTWF470N SEQUENCE
PROJECT:- CvewireOxwo )qoi t STANDARD FORn c
' SEQUENCE. FOR 19t.4-<QNLY COMPLETED BY: Q DATE:_l.4.l9g�
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
' ..NTMI l- rwNevINN _.�N-_N__________________ _A-_5e1A_-
9z--1 '�-"-1,-4--L---J-&-4
OVERLOT GRADINGNN-
' MIND EROSION CONTROL
Soil Roughing
' Perimeter Barrier
Additional Barriers
Vegetative Methods
' Soil Sealant
Other
' RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin
■ Inlet Filters -
F Straw Barriers
Silt Fence Barriers
Sand Bags
' Bare Soil Preparation
Contour Furrows
Terracing
' Asphalt/Concrete Paving]
Other i
' VEGETATIVE:
Permanent Seed Planting
' Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
' Other
N N N N MN N • N N
' STRUCTURES: INSTALLED BY MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
APPROVED BY CITY OF FOR;f COLLINS ON
fHOI/St-C:1989
1
1
1
1
1
1
[1
1
1
COVENTRY SUBDIVISION
EROSION CONTROL COST ESTIMATE
NITi WitiST\fiai myil & Y (mil\I
JOB NO. 9007.00
AUGUST 5, 1994
ITEM
I DESCRIPTION
UNITS
I UNIT COST
QUANTITY
I TOTAL COST
1
SILT FENCE
LF
3.88
3500.00
13580.00
2
EROSION BALES
EACH
9.00
100.00
900.00
3
GRAVEL CONSTRUCTION ENTRANCE
EACH
500.00
5.00
2500.00
4
GRAVEL INLET FILTER
EACH
250.00
10.00
2500.00
PR04ZTOM RAT .P. OPTTOX
ITEM
I DESCRIPTION
I UNITS
I UNIT COST
I QUANTITY
I TOTAL COST
1
SILT FENCE
LF
3.88
0.00
0.00
2
EROSION BALES
EACH
9.00
1300.00
11700.00
3
GRAVEL CONSTRUCTION ENTRANCE
EACH
500.00
5.00
2500,00
4
GRAVEL INLET FILTER
EACH
250.00
10.00
2500.00
Punlu m rnmTpnT CPPTITN(: nprnv
ITEM
I DESCRIPTION
UNITS
I UNIT COST
I QUANTITY
I TOTAL COST
1
I EROSION CONTROL SEEDING I
ACRE
1 500.001
36.701
18350.00
PRELIMINARY COST $18,350.00
TOTAL COST WITH FACTOR OF 150% $27,525.00
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
1
Engineering, Ltd.
JR
PRMCr
SUWFCr Z11A
CLUENT (�-'s• O JOB NQ qj��o 7
CHK.
BY By -DAM... "225� 4a/—
SHEET Na /_ OF _Z
CALT3'CUT
Monday, July 15, 1991
5:49 an Page 31
0.
1. 156.
64. 64. 0.
358. 36. 362. 21.
'
.0( )
.3( ) 6.5()
80.0(I) .0( ) .0( )
.0( ) .0( ) .0( ) .9( )
31.
21. 0.
16. 35. 22.
4.
'
.0( )
.4(S) .0(S)
8.5(S) 8.4(s) 25.9(S)
3.7(S)
IL
CREEK BASIN, DEVELOPED CONDITIONS 1987'****+100-YEAR STORK******
REVISION OF PREVIOUS HYDROLOGY TO INCL. TROUTMAN POND & 4 SEASONS; 9/89
PEAK
EAK FLOPS, STAGES AND STORAGES OF GUTTERS AND DETEMSION DAMS ***
c
PEAK
STAGE STORAGE
TINE
'ELEMENT
(CIS)
(IT) (AC -FT)
(NR/MIN)
206
60.
1.8
0 36.
203
56.
1.8
0 36.
17.
.1 1.6
1 10.
'205
207
15.
.1 1.4
1 10.
^ 204
82.
2.2
0 38.
'201
202
107,
15.
3.1
1.2
0 40.
1 22,
280
59.
2.1
0 38,
200
192.
(DIRECT FLOW)
0 40_
'25
157.
2.9
0 40_
24
51.
3.2
0 44,
23
318.
3.9
0 40.
17.
.1 1.5
1 8.
'279
49
327.
3.7
0 46.
44
66.
2.0
0 '42.
222
' 185
524.
59.
(DIRECT FLOW)
1.7
0 40.
0 36.
278
23.
.1 29.6
3 23.
48
77.
1.6
0 36.
2.0
0 36.
22
22.
.1 29.5
2 28.
3"
107.
1.0
0 38,
47
150.
2.3
0 42.
45
169.
3.0
0 w,
221
160.
2.5
0 U.
21.
22.
1.3
2 36.
'3"
5.
.1 4.9
2 22.
365
97.
1.0
0 38,
247
39.
.1 13.0
2 10.
20
1".
(DIRECT FLOW)
0 U.
t
• R ;
ALT3.wT
r
368
1 370
369
367
3"
' 320
372
2"
373
371
2%
' 19
28
287
40
362
104
243
36
107
32
29
27
375
374
1 38
43
321
' 318
105
t05
30
18
300
245
42
' 35
319
17
301
' 103
102
56.
121.
95.
57.
103.
61.
66.
256.
123.
1".
72.
61.
45.
113.
63.
98.
17.
288.
116.
78.
165.
109.
163.
43.
84.
201.
31.
78.
82.
20.
232.
199.
96.
M.
75.
249.
101.
415.
96.
221.
80.
605.
.8
3.1
2.1
1.4
1.6
.1 3.6
.8
(DIRECT FLOW)
3.4
1.9
1.0
1.5
1.7
2.5
.8
1.0
.1 12.1
(DIRECT FLOW)
1.1
.1 1.5
1.2
2.5
2.9
3.6
1.1
2.6
.1 19.2
.1 1.3
1.7
.1 6.5
3.4
3.2
(DIRECT FLOW)
(DIRECT FLOW)
2.6
1.2
COIRECT FLOW)
4.3
(DIRECT FLOW)
.1 6.6
.1. 16.0
MardaY, JUIY 15, 1"1 5:49 an
0 36.
0 36.
0 42.
0 44.
0 42.
1 10.
0 38.
0 40.
0 40.
0 40.
0 36.
1 12.
0 36.
0 38.
0 42.
0 36.
2 12.
0 40.
0 36.
1 6.
0 38.
0 38.
0 42.
0 52.
0 40.
0 36.
6 40.
0 48.
1 0.
1 40.
0 40.
0 42.
0 6.
0 38.
0 36.
0 36.
1 4.
0 44.
0 6.
0 50.
1 40.
0 48.
290
69.
5.0 7.0
1
n.
262
36.
3.0 16.3
1
28.
33
170.
.1 12.0
2
20.
15
548.
.1 2.1
0
56.
271
186.
(DIRECT FLOW)
0
6.
270
69.
4.4
3
0.
261
59.
3.5 .8
0
50.
mI
�av = 4�O:
Page 32
1.
UOUT
14 720.
'272 224.
13 M.
12 992.
'210 1019.
101 1014.
211 1060.
'100 "Or"11 1026.
10 1064.
1 1064.
1
PROGRAM PROGRAM CALLED
1
1
1
Morday, July 15, 1991 5:49 an
3.9
0
56.
7.7
3
0.
4.8
0
56.
7.0
0
58.
(DIRECT FLOW)
0
54.
.5 4.6
0
56.
(DIRECT FLOW)
0
54.
.5 24.2
1
6.
5.5
1
10.
5.0
1
16.
(DIRECT FLOW)
1
16.
Page 33
_.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._ .
-----------------------------
________________ ___ ________ __.L__ __ __ __�
—_
E. 9ENTLEY PLACE
11 r
1
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1
w
w w
a
r
r
r
w w
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
DOMD r au®ar+
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JReuof. iGd.
Bal.�pW, �111
ra rmi 7w-M3
0
ees soy iz1-so19le
PNGWd G/PLANNING/�G
1
J
r— 168 It
- 11� ��ti 68
i
164
364 .
I
�78 1 \— U,
I
49 83
`_ '
201 I, 00 fl ell 49 i. _ —
03 44�— O I a
2 79 179 84
— -- — �_ 48I� '
24
/62 206
Tell. --`1_ B5 � ral
` !> _
75 25_20
le -elf l"L
see
—es eeeeeen�
74
Jj
I ' ^` 20 73
elle— II
r CFi Fit`
F. _
NOTES
t. Tns be rep,,herabs yad%C
do,beeont as d the gaa
v d as p + The
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LEGEND
53-SWMM SLB—CATCHMENT
34 —CONVEYANCE ELEMENT
OS —DETENTION ELEMENT
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n'a1 CITY OF FT. COLLINS -MAIL CREEK 48 400-89 2-19-90
MAIL CREEK k4N3
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HYDROLOGIC INFORMATION b
1 of
PHASE I CONSTRUCTION TO INCLUDE LOTS o -
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NOTICE- Z
NOTICE- O Z
Ld
3 al M these Isnn b the City of Fort Approval of these plans by the Fort Collins- L)
Approval p Y ty (n J U
Collins is for Phase l infrastructure consbuceon CL x
0 only and not for any other inirastrvcture for this Collins
Water District and the South Fort S J D
Collins Sanitation District is for Phase 1 25O
or NOTES overall Coven" Subdivision Filing Na. 1 construction only and not for any other For ons m N
without a wdeen "NemorarWum of A9reameor. of the overall Coventry Subdivision Fill" No. 1.
xsrtCT rao arruR CRAWL_ ru1mS AFTER EACH SRI EVENT. City f Fort Collins, Colorado N O Z
T REMOVE YL T WHEN bE HAT a THE nLKR COVEN HAS BEEN Y U Z
FILLED overall 4m T slut RE Mlibi N AN AREA U LITY PLAN APPROVAL } J Q TRIBUTARY TO A WDMENT BASN Ce OTHER TIT W MEASURE. (if
8 2. SAPMENT And GRAWL inlN BE iWEgATELY REMOVED FROM TRAVELLED APPROVED. Z C)
WAY or ROA➢S o, W Enµ,,v9 DA, EMT Collins - LOVELAW WATER DSTRICT O
2 ER M CONTROL MAINTENANCE I5 TRE RESPWS W OF THE MHLCVEA. SW1N rdR LOWMS SANILAPM DISTINCT0 Of
CHECKED By. Rw a Ww tv Unit mbe UTILITY PLAN APPROVAL W K
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6 CHECKED By. _ J
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< 100 50 0 ,00 200 .wADN L.)CHECKED BY'. DATE P-17-S V M
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CHECKED By. DATE % JOB N0. REV.
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2) SEE TITLE SHEET FOR ABBREVIATION LIST.
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ApPrI BY
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Wnc Cowry Engineer
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Colorado
Z
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APPROVED
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on.
3270.00
3