HomeMy WebLinkAboutDrainage Reports - 03/02/1994STEWART&ASSOCIATES
Consulting Engineers and Surveyors
February 25, 1994
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.U. Box 580
Fort Collins, Colorado 80522
Dear Mr. Hamdan:
The following is the erosion control report for Trail West P.U.D. which
is located at the intersection of South Overland Trail and West Stuart Street.
Trail West P.U.D. is an 18.45 acre multi —family planned unit development that
was approved in September 1979. The P.U.D. has been partially completed.
There are seven multi —family buildings completed, and all of the water and
sewer mains have been installed. All of Overland Trail has been improved,
and approximately 800 feet of West Stuart has been improved. Approximately
400 feet of Neil Drive has the curb, gutter and walk installed, but no pavement
has been laid in Neil Drive.
The remaining buildings to be built will be divided into five phases.
Likewise, it is proposed to phase the erosion control according to the five
phases. The public improvements that remain to be constructed are nine sewer
services and twenty—three water services; and the curb, gutter, walk and asphalt
on the easterly 600 feet of West Stuart Street remains to be constructed.
The undeveloped portion of the P.U.D. has moderate ground cover of weeds
and grasses. The existing building sites for Phases 1, 2 and 3 will not require
a great amount of overlot grading. Phases 4 and 5 will require more overlot
grading. The ground cover will be disturbed for each phase separately. It
is projected that the five phases will be completed in two years.
The west half of Neil Drive will be constructed with Phase 1, and the
east half will be constructed with Phase 3. The remainder of West Stuart Street
will be constructed with Phase 3.
The original P.U.D. had a proposed detention pond in the northeast corner
of Phase 4. It was requested and approved in March of 1987 to delete the
detention pond.' The existing development and Phases 1, 2 and 3 will drain
to an existing Brown Farm Detention Pond via West Stuart Street. Phases 4
and 5 will drain to the Brown Farm Detention Pond through the existing Willow
Lane large drainage Swale.
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
303/482-9331
Fax 303/482-9382
Erosion Control Report — Trail West P.U.D.
Page 2
The erosion control methods that will be used are as follows: (a) do
not disturb any areas not necessary for construction, (b) build silt fence
along north line of each phase, (c) place straw bale barriers at outfall points,
and (d) plant temporary crop with mulch in some areas.
To the best of my knowledge, the erosion control report and plan are in
compliance with the current Storm Drainage Design Criteria and Construction
Standards of the City of fort Collins.
The cost estimate of the erosion control methods is enclosed as a part
of this report. If you have any questions regarding this site, please call.
Sincerely,
Richard A. Rutherford, P.E. & L.S.
President
jrr
enclosures
CONSTRUCTION SEQUENCE
PROJECT:
i )2 A IL
WEs r
P U. D- { NASB Z
STANDARD FORM C
SEQUENCE.
FOR 19 94-
ONLY:.
COMPLETED BY: R A. E.,
DATE: JAu zo, i9 9 ¢
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 j J I I I I
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
Fov v DA 7 /D,VS
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other I
STRUCTURES: INSTALLED BY-
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HDI/SF-C:1989
s
o
-v
D
MAINTAINED BY
APPROVED BY CITY OF FORT COLLINS ON
JANUAI'i 1991 8-20 DESIGN CRITERIA.
RAINFALL
PERFORMANCE
STANDARD EVALUATION
---------------------------------------------------------------------
PROJECT:
1 '.AIL WEST P.U, C>
STANDARD FORM A
COMPLETED
BY: R , A. [.
DATE: JAu. zo,lgvd
---------------------------------------------------------------------I
DEVELOPED
ERODIBILITY
Asb
Lsb
Ssb
Lb
Sb I
PS
SUBBASIN
ZONE
(ac)
(ft)
M .
(feet)
M I
(o)
---------
PHASE L
-----------
7Vl6,q
- --
17(,At.
-------
¢SOFT.
-------
bfZ"/0
-------
------- I
—
----- —
PHgsEIL
H (oN
3SAa
4-(IoFr.
1 d0 �'p
77.G%I
I
PHAJ6IL
fi16,H
S,SZAt
(pZOF7.
137/,
17
I
n
slip
PHAs6 MT
i416 H
2,44 A,.
S80 Fr,
2,93'lp
I
PHArF,M:
1.5 3 At,
4-61 o F7. I
7G, 4
I---------------------------------------------------------------------
IIOI/SF-A:1939
EFFECTIVENESS CALCULATIONS
I----------------------------------------------------------------------
PROJECT: T R-AIL_ W EST P. U, D. STANDARD FORM B
IICOMPLETED BY: e -A. e. DATE: JA ,. zo,/9f�
I
Erosion Control
C-Factor
P-Factor
Method
Value
Value Comment
--------------------------------7-------------------------
B v It- D i AN L
0,61
/. 0
ASPHALT tCoAvc,
0,01
1 0
BAP-e G,eOL)Njz�,
1.0
11a
S-rz,Aw E'ALe'SAeeiac
/, O
0.g
TEMP CAD. IMVLC'M
6.06
1,0
S'L.T ;=E.1/C6,
/. 0
Q$
--------------------
MAJORI
--------------------------------------------------
PS. I SUB I AREA I
BASINI
(o)
IBASINI
(Ac) I
CALCULATIONS
-----
I ------
79.Og1
I -----
=
I :----- I
/,7GAc.l
--------------------------------------------
I
I
^rPAt4
= 0,&0 Ac.
P3 L t� cp
= 0- zy 4e.,
aACC;
6,eo'J=0.87Aa.
-.
WTDC=CO,a0x.0r)+Co.29x0.00+(0,Vx 1.0)
--T—I /. a
= 0. s0
�ll7p P = 0-so X 0.8 = 0.¢0
CFF = — �0.S0x0.40)x/00= 80.00/0
OK ? 79.0%
As pA•/f = 0-374c.
B L-fl6 = 0. 18 Ac.
$ AP-G 6 B0v.v0 0.65-
40.
TEMP (rROP/,�I�tcH=O.tSq�
= 0. 0 z-
(V T D P = 0• SO x 0. Quo
C FF = -(0.1D x0.49L)x100 = $1.3
0 k 7 -77,
-------------------- 7-------
DI/SF-B:1989
e
'"� EFFECTIVENESS CALCULATIONS
I------------------------
----------------------------------------------
I PROJECT: -riz AIL— k%EJ'r P. v.v. STANDARD FORM B
(COMPLETED BY: e:Ar- DATE: JAb.Lv,Ai4¢
Erosion Control
C-Factor
P-Factor
Method
Value
Value Comment
---------------------o
SvILD/u4
-----------------------------------
, 01
/• D
I AcP;+ALTrc (0,Vc.
0.0)
/ o
BARE Cosovup
/, 0
/, O
.ST,eAw BAL6BARpicse,
/♦ 0
0.$
TEMrr Ce0P /M✓Lc.v
O.Ob
/, 0
SIL % F&"Ce
/. p
EXuT Coe0VA,?P Covee_
---------------------------------------------------------------------I
o o
�
MAJORI
PS._
I SUB
AREA
BASIN
I (;)
(BASIN`
(Ac)
CALCULATIONS
-----
------
179')%I
I -----
1 �
I ------
I 5.5L
--------------------------------------------
ASPHALT
Z•S3AL• I
bull n/uc 0•07- Ac. I
8 A R E 6 R.ovn/ b I. 93 4c
E%/ST•6e0vjJDeav« C,44-Ae.
W rD' C = (z'S3n 0.0/) L(0.4ZX o•0> t (I.93X
5•SZ
= O.3to
STD P = OSO x 0,80 = 0,4-0
t: Fr- = — ( 0. 4 o X 0, 3(,) X / oU - g s, C/o
OL- } 7 9. 1 Yo
----------------------------------------------------------------------�
DI/SF-B:1989
---EFFECTIVENESS-CALCULATIONS--------
PROJECT: rP-Alc. LUC-sr P.O.P. STANDARD FORM B
COMPLETED BY: A e DATE: .,1Au.u,/99¢
Erosion Control
C-Factor
P-Factor
. Method
Value
Value Comment
----------------------------------
S3v11-p/.u0
0,01
o ----------------------
/.
At pHiAL,7 £ CO)vC.
0.01
/• 0
BA 2 6 Cji EJ v u p
/• 0
/, O
Sr IC1 W a ae.ICg
/• 0
0• 0
TBM P. GRop/MVLem
/. O
FE,vC s
E1clj-r G cvv�vC Covert
----
O.Og
MAJORI
-----------------------------------------------------------------�,
PS.
I SUB
I AREA
BASINI
(;)
IBASINI
(Ac)
CALCULATIONS
-----
------
8l•9 %!
-----
.L
I ------
12 99A�
-------------------o-.---3sa-�--------------------
]�v1t.D/nay . I
As PH AC,—
ECovC, p. SG Ate.
I
0S4c, I
Ex„ ,. 6/ZOVND
Cove, O•Z3gc, I
I
I
TEMP, CROP/A
v[CH O, Z5 AO•
-41. 4- % I _-r_
/• S 3Ac,
I
UJro C (0.35x Oa/) }(o•S6x0•oi) F(/•OS)r/•o�� (017.3x0102 1(DZSxb•06
-G•44
0• ¢ S
W7o P = O,SU x0.80 = o•�o
E F = I - (v.4sxo•¢v) x /00 = 8t.o0/0
0k i 81,q %
a V,L D/n)Cn = 0• Za AC.
ASPHALT NC - 0• ¢3 A c.
6Aes G2o,vvp= o.8¢A,,
W7-D C= (0•Lcx0.o) t(0,g3x0.01) f0,60".e)
1 S = 5S. ¢
W ro r = o.s'o x0.bo - O,40
�r-F = /- (o•ssax 0•¢0)n /rro = ?7.8
ok -,,, 76.4-
--------------------------------------------------------------------
DI/SF-B:1989
STEWART&6SOCIATES
Consulting Engineers and Surveyors
January 21, 1994
Mr. Glen Schlueter
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Mr. Schlueter:
The following are the cost estimates for erosion control for Trail West
P.U.D. by phases:
Phase I 1. Silt Fence - 250 L.F. @ 1.50/ft $ 375.00
2. Straw Bale Barrier - 3 @ 50.00 150.00
3. Reseeding total area of 1.76 acres @ 649/Ac 1142.00
Phase II 1. Silt Fence - 150 L.F. @ 1.50/ft. $ 225.00
2. Straw Bale Barrier. - 3 @ 50.00 150.00
3. Temporary reseeding with mulch -
0,15 acres @ 1300/Ac 195.00
4. Reseeding total area of 1.35 acres @ 649/Ac 876.00
Phase III 1. Silt Fence - 880 L.F. @ 1.50/ft $1320.00
2. Straw Bale Barrier - 2 @ 50.00 100.00
3. Reseeding total area of 5.52 acres @ 649/Ac 3582.00
Phase IV 1. Silt Fence - 820 L.F. @ 1.50/ft $1230.00
2. Straw Bale Barrier - 2 @ 50.00 100.00
3. Temporary reseeding with mulch -
0.25 acres @ 1300/Ac 325.00
4. Reseeding total area of 2.44 acres @ 649/Ac 1584.00
Phase V 1. Silt Fence - 440 L.F. @ 1.50/ft $ 660.00
2. Straw Bale Barrier - 1 @ 50,00 50.00
3. Reseeding total area of 1.53 acres @ 649/Ac 993.00
In each phase except Phase IV, the total reseeding cost is the greatest,
so the amount to be escrowed with the City of Fort Collins is 150% of the
reseeding cost. In Phase IV, it is 150% of the first three costs. If you
have any questions regarding this cost estimate, please call.
Si�ncer_eIy,
Richard A. Rutherford, P.E. & L.S. ��.`,�,@�•.•••••., -•,
President `�•��� t�`�tsrt TF`..o -
502 Jrr :yrt• 3 '
James H. Stewart
and Associates, Inc. '+,`P�,'• f & L. 4,
103 S. Meldrum Street +�i'�F •••••••' O ��`
P.O. Box 429
Ft. Collins. CO 80522
303/482-9331
Fax 303/482-9382