HomeMy WebLinkAboutDrainage Reports - 07/29/1993Op ® STORMWATER REVIEW COPY
"mTrT C*t final A ,roved Rep�ri
.17
43 Date.
DRAINAGE AND EROSION CONTROL REPORT
LOT 13, CREGER PLAZA SECOND REPLAT
PREPARED
FOR
MR. DALE BOEHNER
PREPARED
BY
STEWART & ASSOCIATES. INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
303/482-9331
-svLY z91 1993
DRAINAGE AND EROSION CONTROL REPORT
LOT 13, CREGER.PLAZA SECOND REPLAT
SITE LOCATION AND EXISTING CONDITIONS
Lot 13 of Creger Plaza Second Replat (the site) is located on the west
side of South Mason Street approximately 400 feet south of West Horsetooth
Road (just south of Horsetooth Bowling Lanes).
The gross area of the site, including one—half of Mason Street, is 32832
square feet or 0.7537 acres. The site drains into the Foothills Basin.
The site is presently natural ground with fairly thick vegetation. The
Burlington Northern Railroad lies along the west side of the site, and a portion
of this right—of—way (2900'square feet) drains onto the site. The lot to the
south of the site is presently undeveloped, and it drains to the east and away
from the site. The paved parking lot of Horsetooth Bowling Lanes lies north
of the site, and it drains to the east and north away from the site.
DEVELOPED CONDITIONS
After development, the site will consist of 17332 square feet of hard
surface, 7500 square feet of landscaping and 8000 square feet of compacted
gravel road base. The developed composite C will be 0.68. The building will
be used as a sales showroom and warehouse for Dale's Floor and Wall Coverings.
We plan to detain the runoff difference between the 2—year historic runoff
and the 100—year developed runoff. This detention will take place in the front
parking lot and also on the gravel turn —around at the rear of the building.
These two detention areas will have the same highwater line elevation and will
be connected by a 6—inch pipe.
Runoff from the rear gravel_ turn -around will be carried through the 6
inch pipe to the pond in the front parking lot. Runoff from the building and
paved surfaces will flow directly to the front pond. Outflow from the front
pond will be piped east under the landscaped berm to the west right—of—way
of South Mason Street. A concrete culvert with a metal cover will begin at
the street right—of—way and carry the pond release under the sidewalk and
through the curb to the west gutter of South Mason Street. A restriction plate
shall be placed over the pond outflow to control the release rate.
The west gutter of South Mason Street flows north to Horsetooth Road.
The break point where South Mason Street begins to flow south is at Creger
Drive which is about 200 feet south of the site.
In order to provide a detention pond in. the front parking area, the
driveway from South Mason Street into the site must be humped up to form a
ridge which will be the pond high water line and overflow. The high ridge
elevation will be 5037.0 which will be the overflow elevation. There will
be about 390 square feet of the paved driveway which will flow undetained into
the South Mason Street right—of—way. This undetained runoff will be
insignificant, and we hereby request a variance from the storm drainage criteria
to allow this undetained runoff. Also, an approval statement on the utility
and drainage plan has been signed by the owner of Lot 12 for acceptance of
additional storm water runoff generated by paving of the 15'x6O' access driveway
over the northeast corner of Lot 12.
Lot 13, Creger Plaza Second Replat
Page 2
Calculations for the historic site runoff, required detention, restricted
release opening, and provided detention pond volume are shown on the attached
sheets.
EROSION CONTROL
The site is in a moderate wind erodibility zone and in a high rainfall
erodibility zone. This site is small and will all be graded at one time.
A silt fence will be placed along the north property line to prevent sediment
from washing onto the existing paved parking lot. This fence should remain
in place throughout the project. The grading will form ponding areas in the
front parking lot and in the rear turn —around area, which will act as sediment
traps while the curbs are being constructed. Construction of the curbs and
outlet pipe will begin immediately after grading, and when the outlet is
finished, a gravel sediment filter shall be placed over the outlets. Gravel
base will then be placed in the pavement areas and on the rear turn —around.
During this time, the building slab will be constructed. All of this
construction will take a relatively short period of time, so the only bare
soil will be the area to be landscaped. Paving and landscaping will take place
as the building is being completed.
The rainfall erosion control measures will provide effective wind erosion
control.
All drainage and erosion control design and calculations set forth in
this report comply with City of Fort Collins Storm Drainage Design Criteria
and Construction standards.
• /u e
Phillip I. Robinson, P.E. & L.S.
�= 4502
s : a Co-,
O V u o c rontler o op Niyhthi3wk'�• o' !S °4� o� N o
o .� — d Ct•E 4 �� b� Dr.
p .2 OE .V y JU O•
c w Q
o E — C
U O` 10
m
U 1h( Swa tow ' Rd. Cr o E. Swallow Rd c a g
`o 01. Lunt I L Bo olink o ; m
a ct° �o Cir• N
r--
y `\�°�°�4 G�• 1 v C ._'RO ur"Gt::. I .. `\15 PkwY• :.
5\�Je o 4 Q �� !0 Y Cardl Ct.7iy
�I
..
s � °,� ° a e
Horn I 9 t E'
tsod:. Bluebird
�• n Ave. Cl. G\.—
On Qt G%Ot` L\ to
c?' Justice. Dr. vw
UA ¢ E. Monroe
pan ae &A Ave.
Affirmed CL �' Si
0 0\. Mt:: Monroe Ave.
3 L°
W. Horsetoot Rd. - Ia
M
n.
s Drift
5 o Ave. ,.
Arbor x U : ' � �. L Y OrbID �+
c -',
c : L.�m
�o CU
Bonita Ave.
6—
� r o' o,
L Leeward Ct w/A�EN
ado.. c Ave. Jaimdn D�. � ; yAKE
CA G o4 z o I Bowline Cf.
y _ ct
jog
Y
t Ct. $UJN SITS\'
Winter eF o C IboOrowl
Cr. Nest Ct.
m..:. 5
Marble Dr. y, 2 S I Boardwolk Dr 46 Ln. s
abash St. 1 High
r Point �...
Butte Pass Dr in UU a) pe torlin t
0 = 6
0 3 ai o c� Great Plains Ct U.
Z v a a : c v' ilemont Troll n P.
0
o emmmA n ear Creek Ur v Thr skier p:: l
e
Crecy Blade Grand ' S1. `o i �" M 6
One- (nHawk Ct. °neir r e `' I i
bu
S Lane Oil ny I : tri ; Wvil on
Pi
` . ; Owl C�huk
¢, Ln. ' Ct. ti. Kedein n i in
"robin
Nbodland Way Towhee'
�t
g' o
vy klVICINITY" �Ct.
=/000
Palm �� o
I St.
v '
I I
Rochelle Cir. gip.
o Q r a\O 4
STEWART9,06SOCIATES 103 S. MEL933DRUM1, FORT COLLINS, CO 80521
PH. 482-FAX 482-9382
Consulting Engineers and Surveyors
By: 77 J� Date: Client: DQle Boe-Anei- Sheet No. of
Project: Loi 13 <'- r e-r- 007-Q S. h)
12-0 1
Subject:
Gras Are
.0 r-
174-1- 14. I'S -7,
7=
157
uv- �4 IS
it
II
STEWART8,06SOCIATES 103 S. ME9331 LDRUM, FORT 38COLLINS, CO 80521
PH. 482-FAX 482-92
Consulting Engineers and Surveyors
By: Date: d T3 Client: '7)i e 'gae A'e r- Sheet No. —of
Project: L 0-- 1-3 0 Z< Ffj2f
Subject:
T-!
10 -1 i 7; 0,25)10.60)j$.7537
.Zoi 0.(10(1 3.33
3P7
39 's.2
+ '4% i.
f4i
70 z
ao Z.0,5. ; i I[-i.
W
63041,
65 1
04-00
t
�do
001
IIlli-!I
10 I 3 ry ,(;j 70
37P
S50
7.>-C
j5ee Z
1006
sIZ
zlz ICI
0
STEWART&406SOCIATES 103 S. MEL33DRUM1, FORT COLLINS, CO 80521
PH. 482-9FAX 482-9382
Consulting Engineers and Surveyors
By: F) R Date: Client: Oct I e, 30e el Sheet No. of
Project: o 71 13 C r-52L ��er 17/ a Z_ �
Subject: F0 rlej Vo
F75007 PO /V17
;��o -+o vr-1 'Ar e -Tviolv; (L//%"k
101
1717
3 C-0 7-76
3,15 -0
0
-3
71011 I.
-/1 eleV! Ii7.0
-0 tv r 7,
-:T Z3 71 bo 0
0,/
t 1-1
i I G �� _ { ! I p I ( i _-- -- --� _ I - - � I i � � � � � I ! � i
V0 0 Vo (VIne
1:3
2� 0. 7 0 d-J-1 6�
III
L lo
t, Ic 0/-11 cqiine 5 77C� cL/
I tl�af V I V01,11V 0
53
—4
i
�- I I
Ill lilili
RAINFALL PERFORMANCE STANDARD EVALUATION
I--------------------------=--------------------- -------
I PROJECT: LOT 13 Cre9er ylata Seun�_ �c��c STANDARD FORM A
(COMPLETED BY: P /Tz DATE:
--------------- --------------------------------------------
----------
IDEVELOPED ERODIBILITY Asb Lsb Ssb Lb Sb PS
SUBBASIN + ZONE I (ac) (ft) W (feet) M 1 (a)
------------ ---- -----------
--
To 7FL /�5�, I ,7537 34-00.6 17,5, 3
-------------------------------------------------------- -------------�
)I/SF-A:1989
EFFECTIVENESS CALCULATIONS
-------------------------
---------------------------------------------
PROJECT: Lof �3 Cr-crier j�/.az� ,Secb��. rflih5 STANDARD FORM B
COMPLETED BY: DATE:
Erosion Control
C-Factor
P-Factor
Method
Value
Value Comment
Bare Satr-------..--•
-�.
-----------------------
S14 Fence
oU-------7-
00
Sed+
O.SO
0.0(
�00
0,10 .
(. 0O
------------------------------------------------------
MAJOR PSSUB AREA
BASIN (;) BASIN (Ac) CALCULATIONS
Ne4-...... -------------------- ------------------
73 3 298285 bare so►1 �oGU s
Ga�cre%e 61�� Gk7� Sf
5e-Duel �GIe 14-5'S � sF
W�` C- �Of/�I�{-�Gb7i�<U•O���I4°IS3�O.(G)
2 °i cF' ,P
0. 32
'F�F-•-*6— 0.3ZX0.T) xiOo - Bq-(�
Gas �or 3Q0� q0(/ ,
% o f 10Oo
GG.54- �v reveje4-i -' e Z� k2J�S.F.
r�e v
We 0o�
------------------------=-----------------------------
DI/SF-B:1989 - - - - - -
CONSTRUCTION SEQUENCE
PROJECT: Lo-} 13 (f rgZ
o�pr I7)ctzc,
STANDARD FORM C
SEQUENCE.. FOR 19 13 ONLY COMPLETED BY::,. P) R DATE:
Lndicate by use of a bar line or symbols when erosion control measures will be installed.
Major modifications to an approved schedule may require submitting a new schedule for
approval by the City Engineer.
YEAR
MONTH _I M I S ------
OVERLOT GRADING
w
IND EROSION CONTROL
Soil Roughing
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 yRvel �>oSP
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
Iz
------------------------I
STRUCTURES: INSTALLED BY MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
�I/SF-C:1989
sTEEI "EsIrlP.oTE
� 10V GUR9
4 ✓[.a/e DOLT,
—
PAY
Z%4 ra 2� OaNIaI4
'.� K 6VTFR
FLEVA90m VIEW OF
RFSTRICTIOM PLPTE
OVLER o ' OID OgeALL RIP(
(a. m N ,[ K a..i „na l I I
M .6035,33
Nl /IRE F•✓.DR/aNT
5W COR, H095ETOOTH ¢MASON
All
AN
AN
'uus�..AArr
O
Tµ�If)
wua.
1
0
6RT reaE
J
AN Al
..� AVICAFFHAFF
Roza
D
WHO
AW LA
off boy. No.
Cry
WO
... iv�...ua,.
- 911.GM., vm. ..ainLTM
Y N, rh
[LEV ij00� � TO�[ E ITS -
op
11 C �L
CA VE `nlu I O
ORNCC G IONIC,
'aW TH E Alvee WALL let
ALI
SECTIOHE
N CR F3to
N.T. 5,
RPCE 690JT NHNII O PILE
FOREVENT >OIL FROM ✓n5N N6
T $ .37..5O
_INTO I tOUIVICOMILIVI CULVERT -
L
Top\
TLPAI[`�
z can
rE ucuae
C L
I/d ,CIAs>p
IS Ste' 4 VVC ¢L•]5]*-
¢TE R
i/O
'3J I
a+T[wrrl zY• PFN fsU,TCa
Ex TENT ^NP: IBA
aUa WEa 0 E PIPf
N ec vW
tE PLmE eGJC
`F ae
o TRa Ih •8e
DUCTS
LA6 Ts SEC
!ON TNR�g�t.17_pO T�ID L�€T p17E_
CHAMOw ATE Truom
ALK_CVL ✓EL ✓E$T✓ERT qNO-GU?4 C
INCT
-
-
1,71 l ALUMINUM TANT
NL5.
LepA HOUSE rye l O[ SIM OO d 'u 1� '
4F ga
Iyeyd PETAL OR GONC. COLLAR AL EECTNON G-C yAl \I, dl
obow
slope 'Is 0
FROONO INLET TO G'Rvc T, T aly
A T o, LEI_ \\
11 �LOT PHRKING \-v
1 ��EXIST'i�G ASPHALT � - SCALE t I'• 20'
\ CONZT cOwC. COLLAR IN5TALL SILT FENCE ADI1I NORTH
ARLET
OUNCA INIA TO I
` a V 4" VC TORM P n1 ` Ep .^pY flow, ° Oil NF T) RCNVIN 7HKOV6H
\` bo 9P 6y 611 I ([E OCTgL roOVC) Off a/Oa✓M 16) r EZT LICE
\ TH Al I/RJ-IF 'I
ulr
C . T e d
n
\DIS
\ FLOOR EL EL. T,�nN 503e.00 ¢'' E
NTO
v Nh
fIs''1'-�'� FI ffl
Fly a AS
Al Cost
N-OFAAA�EctM'FbbA H j
ON"'MCI
. ,fl TT
roOy.
ft FEAR JETPW POND
ObER CLUW SAIL PULL'+/AV ELEV :T.'F _
•L 332v
M T
E DETAIL A
TO-
RI6HT HEREON
yfl
11,74
- I
-Cull
-pd2 'I}
� Iz
114 CONE
E�n!��D//OF
w w Aw G yI
RARKIN6LpfT/]'�'`~1i�
.A 191 OAAOA y
NOT H IpW L9G.SG a[D j
ER[cTR
F IiYaLAt) � s .m_o LICE,�
D3
T ! 2
.je od {oi' j6Tel j646)
r �
I
L S/TE J.4Al 5 O FOOT/- LL5 3,,,5,N1
L. NR STE ,AREA 32032 3F
3 NI TOR TI 'A?i INOCL OF 3 TE ClFlyy. gTJ2 SF
CI
EVELONE➢ G'OO.6e
6 DR
TGNTION E4VI4EP' 5307 CO.IFT
OF
R 0£T NTON 5TT0 C PROVI'JEP FT
9 HLLO P'T~ ➢ETEnIT,Oh CAN, CA /.SO
:1 RELEASE RATE 0.111 1 c{y
PERSPECTIVE
FAA
VIEW
-�,
F
en SEC70—AA
Fool
NEW DRIVEWAY APPROACH Dol
9
:6A
k<
:
-
E>
o�
E y y3
y
!# ita�iji
If
(
sIf
i4,y
[;
y
8s
i
g 'g't
a
,Dill _yl..
E ARE�M,
if
TYPICAL MVIC[ PETAL
FRONT DETENTION POv
SPILLVAV THROUGR
ORNE✓Ay FIT ELEJ, J'/,O
yl
�fy
AILj6
Op=vIIV
off �=Rzyo
IF Holoor
Al A
IF
HAVIC
All OFFAI Abboy HOW
r �94/
IF wits
i
DETAIL'A'
VICINITY MAP 5CALE-I"-2000'
LEGEND;
iD3G—_-3c--� EXIST/N6 CONTOUR
36 0 FINISH CVNTOUR
1
A (3F,59) £+ISTINm SPOT CLGVATION
AW(RT
35.80 Fill 5aOT ELF✓O'll
]OA ooVEL .aICHSFr:
ALL yne�a ey�o�NNs
q... ASaNAR PVMT OH.nDEIJJ
Y[.YaN
CONCRETE GVHT, E WALKS
35,E,
l a #UVS�
_ ___
DRRI a9Srry BWNDARY
I
l xY»n
—. PEN
SILT PENCE
e
ice^
All
o
...<, A
, 11
,. .....A. .<,.a .,I CALIF.
u
y
Of Oil
ep
A..,<,..,wl ,.,.<,,....r.11..A,.,._<,r,,.
a
All
1- oil A Ali I*." IIII ..I' of III, Ill. CIA Abot A lootfif
o
V�
I I
LAOS
V "c
Al :r_WAly�il7
Q
C
As
e
I ... a <. , ,.. .. < a,. ,
e
I
.<
O W e
Q)
l.tw
2, of UNCIP of FAUN VNIHNAA Wilso, mUsu,nrrhilly, w
a,
NOTE
. r.. 4.5 Ml FAA ...<...., .<L
H P I NA
D
TU V E Na FF r
5 M F R"Inl. <..L,
T PBJ
WI L Rom, Not OF ru. ue r.
COF,lO
NMy
w�<a'n
ryI /5 6O '
o1P yMC NERFB/ U. If MIAMI" Is go" IF INIC .111itIM, A MILE
ACGCPTFJR
,5
ND
`^FO - <4sAll AS '"IMdr< r<v+an<Ib~A�ASHIA,�—
lw�oMw/LANCE/
13, All Cookfibbby AfFAAA IF My, VIA WE FACT IVAN IN ifoo of
oY
Will All FILM IIIsa,...as e,a.,. a..<me.0
Coll-ofIt
UG LOIT 12 cRECrER IA SAILL
'rim
atpi
"6M "n
u D REVLAT
. I
EROSION CONTROL NOTES:
/. THE CONTR>CTOR SMALL PROVIOH LADOR AND EOVIaMENT
TO GLEAN VP.MVD AND 01ifil TRACKED ONTO
PAVEO 3TREETS.
I�jl
2
2. INSTALL RI SILT FENCE ///Y LO<gTION SHOWN T ON —n. W
ALONG THE EX ISDN6 ` TOO pRRKIN6 LOT ON T E
WALLWr ,71 OF TvL 5'TE TOO VREVENT-MUD FROM 0
wgsNlNc ON:J PAVEMLINT.
CALL
6R¢aCO Ill SEDIMENTS TRNO OVER ON
THE DETENTION PoND OUTL.ETS, W[FICH MALL REMAIN Q
IjNeOVCN P.ROTEGT _r JAl
caEGER on.
,.II. f. G
ae A Iz
FZ
WE f( ONE
i