HomeMy WebLinkAboutSite Certifications - 11/14/2014November 14, 2014
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J•R ENGINEERING
A Westrian Company
Daniel Mogen
City of Fort Collins Utilities Department
700 Woods Street
Fort Collins, CO 80521
Re: Clare Bridge Fort Collins — Detention Pond Certification
Dear Mr. Mogen:
Under my direct supervision an asbuilt survey and visual inspection of the above mentioned project was
completed to verify the completion of the detention ponds located in Basin A, in the northeast portion of
the site and Basin B in the southeastern portion of the site.
Results of the asbuiit survey indicate that the pond volumes and side slopes were built, in substantial
compliance with the approved grading and drainage plans. Additionally inspection of the outlet control
plates on both outlet structures verify that the outlet flow control plates were built in substantial
compliance..
The attached documentation is a summary of the pond volumes per the designed WQCV and 100 year
water surface elevation.
This certification is signed and stamped and by signing this form the Engineer(s) attests that they have
inspected the site and to the best of their knowledge the as -built conditions of the drainage facilities are as
described in the forms and in the As -Built plans eaclosed.
Failure to properly disclose all known information could result in the rejection of this certification and
prevent the release of any and all Stormwater Utility permit holds on Building_ Permits an Certificates
of Occupancy within this development.
Sincerely,
For and on beha
Michael Brake,
Project Managei
2900 South College Avenue, Suite 31), Fort Collins, CO 80525 .
970491-9988 • Fax: 303-721-9019. w .jrengineenngxom
R
It
DRAINAGE CERTIFICATION FORM Nov o 3
Please fill out all applicable items in this certification
form for single family, multi -family and commercial
properties.
Write "OK" for items checked or actual number checked in
field.
Use "N./SAn for items that are not applicable to the property
that is being certified.
A. Drainage facilities certification
1. Pond Certification SEE ATTACHED SPREADSHEET AND ASBUILT
-volume verification
a.topographic records and volume
b.cross-sections and spot elevations
-positive fall to pan
-side slopes
-invert elevation
-spillway elevation
-placement and size of riprap
-side slopes
_grading
-orifice plate installation and size-
-compaction of berm
-structural integrity of pond
2. Swales
-location (are they within easement) N/A
-dimensions and cross-section verification N/A
-longitudinal slopes and side slopes N/A
-spot elevations - SEE ATTACHED ASBUILT DRAWING•
-permanent erosion control measures (drop structures,
riprap, etc....) TEMPORARY ONLY
-tie-in to pipes, pans, curbs, etc.... N/A
-weir size (elevations, size, opening, etc.) N/A
-available freeboard N/A
-landscaping infringement on swales N/A
3. Pipes
-size and type PER PLAN OR AS SHOWN ON ASBUILT
DRAWING
-slopes (as -built and comparison to minimum 0.4%
slope) PER PLAN OR AS SHOWN ON ASBUILT
DRAWING
-pipe capacity calculations if slopes are
significantly altered N/A
-invert elevations PER PLAN OR AS SHOWN ON ASBUILT
DRAWING
-installation and backfill material PER PLAN OR AS
SHOWN ON ASBUILT DRAWING
-cover PER PLAN OR AS SHOWN ON ASBUILT DRAWING
-encasement and clearance from other utility lines
close by N/A
-joints
4. Concrete Pan Channels
-size PER PLAN OR AS SHOWN ON ASBUILT DRAWING
-slope PER PLAN OR AS SHOWN ON ASBUILT DRAWING
-super elevation N/A
Cl -cross -section PER PLAN OR AS SHOWN ON ASBUILT
DRAWING
-thickness PER PLAN OR AS SHOWN ON ASBUILT DRAWING
-elevations PER PLAN OR AS SHOWN ON ASBUILT DRAWING
5. Inlets
-size and type PER PLAN OR AS SHOWN ON ASBUILT
DRAWING
-size of opening (or name of standard used) PER PLAN
OR AS SHOWN ON ASBUILT DRAWING
-grate elevation PER PLAN OR AS SHOWN ON ASBUILT
DRAWING
-invert elevation PER PLAN OR AS SHOWN ON ASBUILT
DRAWING
-box size PER PLAN OR AS SHOWN ON ASBUILT DRAWING
6. Cross pans N/A
-size
-type
-grade
-elevation
-cross-sectional depth
-tie-in to curb and gutter
7. Culverts N/A
-size
-type
-invert elevation
-headwalls
8. Underdrains
size PER PLAN OR AS SHOWN ON ASBUILT DRAWING
0
-type PER PLAN OR AS SHOWN ON ASBUILT DRAWING
-cover PER PLAN OR AS SHOWN ON ASBUILT DRAWING
-backfill PER PLAN OR AS SHOWN ON ASBUILT DRAWING
-geotextiles N/A
-cleanouts N/A
9. Curb cuts PER PLAN OR AS SHOWN ON ASBUILT DRAWING
-size
-tie in to.swale, pipe, etc...
B. Certification of Grade Elevations Adjacent to
Drainage Facilities: PER PLAN OR AS SHOWN ON ASBUILT
DRAWING
-minimum opening elevations
-top of foundation elevations
-comparison to 100 year WSEL's (Freeboard
requirements and floodplain issues)
C. Certification of Erosion Control Measures:
1. Permanent Measures:
-Permanent vegetation (6" bare spots and weeds under
control)NOT INSTALLED
-riprap PER PLAN OR AS SHOWN ON ASBUILT DRAWING
-riprap bedding N/A
-drop sections N/A
-sediment basins/water quality ponds PER PLAN OR AS
SHOWN ON ASBUILT DRAWING
-netting mats/blankets N/A
-mulching
2. Temporary Measures:
-mulching NOT INSTALLED
-inlet filter installation INTALLED
-check bale dams N/A
-seeding and temporary vegetation NOT INSTALLED
-silt fence INSTALLED
D. Site Cleanup After Construction N/A
-construction clean up
-smoothing of ruts
-reseeding
E. Statement of Compliance STATEMENT OF COMPLIANCE AND
ENGINEER STAMP IS ON ASBUILT DRAWING
This certification is signed and stamped and by signing
this form the engineer(s) attests that they have inspected
the site and to the best of their knowledge the as -built
conditions of the drainage facilities are as described in
the above form and in the redlined plans enclosed.
Failure to properly disclose all known information could
result in the rejection of this certification and prevent
the release of any Stormwater Utility holds on Building
Permits and/or Certificates of Occupancy.
F. Signature and Stamp by a Colorado Registered
Professional Engineer.
11 STAGE -STORAGE SIZING FOR POLYGONAL; ELLIPTICAL, OR IRREGULAR PONDS
Project Brookdale Senior Living
Basin ID: Basin
o� sltsy,z
A nw
W
Sae Sl,reE
L
Sib sbFz
Du
11.
W+ t fim�a"nS�A
{ tyC2'bCrviLiv. R:
---------'C-------- Sae in.,z
saesre.
o.. 11.
W�
�y Sib SiMe
L
Design Information (Input): Check Pond Shape
Width of Pond Bottom, W =I fl Right Triangle OR...
Length of Pond Bottom, L = it Isosceles Triangle OR...
Dam Side -slope (H:V), Zd = ' g/ft Rectangle OR...
Circle / Ellipse OR...
Irregular (Use Overide values in cells G32:G52)
MINOR MAJOR
Storage Requirement from Sheet'Modrfied FAA': 1 0.112 1 0.291 acre-ft.
Stage -Storage Relationship: Storage Requirement from Sheet'Hydrograph': acre-ft.
Storage Requirement from Sheet'FuIFSpeclrum': acre-ft.
Labels
for WQCV, Minor,
& Major Storage
Stages
(input)
Stage
g
(input)
Side
Slope
(H:V)
fl/ft
Below El.
(input)
Pond
Width at
Stage
it
(output)
Pond
Length at
Stage
it
(output)
Surface
Area at
Stage
ftz
(output)
Surface
Area at
Stage
ft1 User
Overide
Volume
Below
Stage
ftr
(output)
Surface
Area at
Stage
acres
(output)
Volume
Below
Stage
acre-ft
(output)
Target Volumes
for WQCV, Minor,
& Major Storage
Volumes
for goal seek
4978.41
0 '
—0 .'...
0.000
0.000
4979.00
4.00
0.00
0.00
-1 155`
341
0.027
0.008
4980.00
4.00 --
0.00
0.00
6,784
4.310
0.156
0.099
10-YR WSE
1 4980.08 "
- 4.00
0.00
0.00
7,066,
4.879
0.162
0.112
1 0.112
4981.00 '
'4.00
0.00
0.00
% Q
- 9,599 .
12.527
0.220
0.288
100-YR WSE
-4981.02-
4.00
0.00
0.00
,_
9 768,-' -
12,701
0.224
0.292
0.291
4982.00 -
4.00 .
0.00
0.00
Q
14,292-
23042
0.259
0.529
Freeboard
.4983.00.
4.00'
0.00
0.00
13;154:
35265
0.302
0.810
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39674.00 UD-Detention BASIN A (asbuilt).)ds, Pond 9/1012014, 110 PM
ID
STAGE -STORAGE SIZING,FOR POLYGONAL, ELLIPTICAL, OR IRREGULAR PONDS
Project Brookdale Senior Living
Basin ID: Basin A
ao SIY SYreL
A
W�
S ks",
L
l I Sae SI.P z
Ds
A 1M
W'Y �44k1LppYItl4h'..
<----------�-------- a site sap.E
saesy.e
o.. a1 m"
W+
( i %bur.
L
Design Information flnoutl: Check Pand Sham
Width of Pond Bottom, W = it Right Triangle OR...
Length of Pond Bottom, L = ft Isosceles Triangle . OR...
Dam Side -slope (H:V), Za = ft/ft Rectangle OR...
Circle / Ellipse OR...
Irregular (Use Overide values in cells G32:G52)
MINOR MAJOR
Storage Requirement from Sheel'Modihed FAA': 0.112 0.291 1 acre-ft.
Stage -Storage Relationship: Storage Requirement from Sheet'Hydrograph': acre-ft.
Storage Requirement from Sheet'Full-Spectrum': acre-ft.
Labels
for WOCV, Minor,
8 Major Storage
Stages
(input)
Stage
ft
in
Side
Slope
(H:V)
gift
Below El.
(input)
Pond
Width at
Stage
ft
(output)
Pond
Length at
Stage
ft
(output)
Surface
Area at
Stage
ftr
(output)
Surface
Area at
Stage
ftr User
Overide -
Volume
Below
Stage
ftr
(output)
Surface
Area at
Stage
acres
(output)
Volume
Below
Stage
acre-ft
(output)
Target Volumes
for WOCV, Minor,
& Major Storage
Volumes
for goal seek
4978.41
' - 0
0
0.000
0.000
4979.00
4.00
0.00
0.00
1 204
355
0.028
0.008
4980.00
4.00
0.00
0.00
6438
4176
0.148
0,096
10-YR WSE
1 4980.08
4.00
0.00
0.00
8893
4723
0.158
0.108
0.112
4981.00
4.00
0.00
0.00
10,500
12,706
0.241
0.292
100-YR WSE
4981.02
4.00
0.00
0.00
10,533
12,895
0.242
0.296
0.291
4982.00
4.00
0.00
0.00
12,242
24,078
0.281
0.553
Freeboard
4983.00
4.00
0.00
0.00
13,579
38988
0.312
0.849
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39674.00 UD-Detention BASIN A (asbuilt).xls, Pond 9/10/2014. 4:50 PM
STAGE -STORAGE. SIZING FOR POLYGONAL, ELLIPTICAL, OR IRREGULAR PONDS
Project Brookdale Senior Living
Basin ID: BASIN B
�
A
FL
W;SibsYrL
Sib Shp z
Do
E---------�--------i siksurL
$IYSYra
Du •1 !w
01
L
Design Information (Input): Check Pond
Sha e
Width of Pond Bottom, W = ft Right Triangle
OR...
Length of Pond Bottom, L = ft Isosceles Triangle
OR...
Dam Side -slope (H:V), 4= ' " ftt t Rectangle
OR...
Circle / Ellipse
-
OR...
Irregular . .
(Use Overide values in cells G32:G52)
MINOR
MAJOR
Storage Requirement from Sheel'Motlthed FAA':
1 0.145
1 0.368
1 acre-ft.
Stage -Storage Relationship: Storage Requirement from Sheel'Hydrograph':
acre-ft.
Storage Requirement from Sheet'Full-Spectrum':
,- ?'.:. -
"'
acre-ft.
Labels
for WOCV, Minor,
& Major Storage
Stages
(input)
Stage
It
(input)
Side
Slope
(H:V)
it/ft
Below El.
(input)
Pond
Width at
Stage
it
out
Pond
Length at
Stage
ft
(output)
Surface
Area at
Stage
ft'
(output)
Surface
Area at
Stage
ft' User
Overide
Volume
Below
Stage
W
(output)
Surface
Area at
Stage
acres
(output)
Volume
Below
Stage
acre-ft
(output)
Target Volumes
for WOCV, Minor,
& Major Storage
Volumes
for goal seek
4977.50
0
.0
0.000
0.000
4978.00
4.00
0.00
0.00
1206
302
0.028
0.007
4979.00
4.00
0.00
0.00.
4 426
3.118
0.102
0.072
4980.00
4.00
0.00
0.00
5597
8129
0.128
0.187
4980.50
4.00
0.00
0.00
8,675
11,697
0.199
0.269
10D-YR WSE
4980.90
4.00
0.00
0.00
12897
18030
0.296
0.368
0.368
4981.00
". 4.00
0.00
0.00
13,038
17,304
0.299
0.397
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39674.00 UD-Detention BASIN B (asbuilt).xls, Pond 9/1012014, 3:11 PM
STAGE -STORAGE SIZING FOR POLYGONAL', ELLIPTICAL, OR IRREGULAR PONDS .
Project Brookdale Senior Living
Basin ID: BASIN B
Ds Sik SkleL
A Flw
W!
msbr
L
<------�
SaeSyeL
Do
A rw
W+
E--------f--------i 5't SYreL
Sii 5lra
Du nn
IF
L 9l9Mt
Design Information (Input):
Check Pond
Shape
Width of Paid Bottom, W =
fl Right Triangle
OR...
Length of Paid Bottom, L =
'. fl Isosceles Triangle
OR...
Dam Side -slope (H:V), Za =
ft/fl Rectangle
OR...
Circle / Ellipse
OR...
Irregular
(Use Overide values in cells G32:G52)
MINOR
MAJOR
Storage Requirement from Sheet'Modified FAA%
0.145
0.368
acre-ft.
Stage -Storage Relationship:
Storage Requirement from Shest'Hydrograph':
aae-ft.
Storage Requirement from Sheet'Fuli-Spectrum':
=
ace-ft.
Labels
for WOCV, Minor,
& Major Storage
Stages
in
Stage
ft
(input)
Side
Slope
(H:V)
ftft
Below El.
in
Pond
Width at
Stage
ft
(output)
Pond
Length at
Stage
ft
(output)
Surface
Area at
Stage
ft'
(output)
Surface
Area at
Stage
ft' User
Overide
Volume
Below
Stage
H'
(output)
Surface
Area at
Stage
acres
(Output)
Volume
Below
Stage
acre-ft
(output)
Target Volumes
for WOCV, Mina,
& Major Storage
Volumes
for goal seek
4977.50
b 1
0
0.000
0.000
4978.00
4.00
0.00
0.00
2 254
564
0.052
0.013
4979.00
4.00
0.00
0.00
4,214
3,798
0.097
0.087
4980.00
4.00
0.00
0.00
5,642
8,726
0.130
0.200
4980.50
4.00
0.00
0.00
8106
12163
0.186
0.279
100-YR WSE
4980.90
4.00
0.00
0.00
11,644
16.130
0.267
0.370
0.368
4981.00
4.00
0.00
0.00
131038 -
17,342
0.299
0.398
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39674.00 UD-Detentron BASIN 8 (asbuiit).)ds, Pond 9/11/2014, 10:33 AM
�((// BROOKDALE
1� - SENIOR LIVING SOLUTIONS -
ALL THE PLACES LIFE CAN GO"
November 21, 2014
Attention:
Dan Mogen, El, CFM
Stormwater Engineer
City of Fort Collins Utilities
700 Wood Street
Fort Collins, CO 80522
(970)224-6192
dmogent@fceov.com<malito•dmoeen6ofceov com>
As the Executive Director for the Brookdale Senior Living communities in reference, located at 1002 and 1008 Rule
Drive Fort Collins CO 80525,1 have reviewed the 100 year flood plan. I am providing my acknowledgement and
acceptance of this plan.
Please feel free to contact me with any questions or concerns regarding this matter.
Respectful)
K V en asquez
Ml`istutive Director
Sterling House Fort Collins
1002 Rule Drive
Fort Collins CO 80525
970.266.0700
Clare Bridge Crossings Fort Collins
1008 Rule Drive
Fort Collins CO 80525
970.229.9777
RECORD POND VOLUME PROVIDED
Subdivision BROOKDALE SENIOR LIVING
Location FORT COLLINS
Volume=1/3 x Depth x (A+B+(A*B)^0.5)
A - Upper Surface
B - Lower Surface
Basin B (Southeast Dond)
Project Name: CLARE BRIDGE
Project No. 39674.00
By: MSB
Checked By:
Date: 12/9/14
Stage
Elevation
Surface Area
(square feet)
Volume
(cubic feet)
Cumulative Volume
(cubic fret)
Cumulative Volume
(acre feet)
INVERT
4976.80
u
0
0
0.000
4977.00
111
1
1
0.000
4977.20
7(,
9
10
0.000
4977.40
1116
30
40
0.001
4977.60
911
108
148
0.003
4977.80
251
399
0.009
4978.00
2.254
387
786
0.018
4978.20
2,856
510
1,296
0.030
4978.30
3,139
298
1,594
0.037
4978.40
3,396
327
1,921
0.044
R'QCV
4978.50
3,646
352
2,273
0.052
4978.60
3,813
373
2,294
0.053
4978.80
4.008
781
3,075
0.071
4979.00
5,415
940
4,015
0.092
4979.20
4,414
982
4,997
0.115
4979.40
4,616
902
5,899
0.135
4979.60
4,823
945
6,844
0.157
4979.80
5,069
988
7,832
0.180
4980.00
5,642
1,072
8,904
0.204
4980.20
6,457
1,210
10,114
0.232
4980.40
7.368
1,380
11,494
0.264
4980.60
8,833
1,619
13,113
0.301
4981.00
13,107
4,359
17,472
0.401
SPILL
4981.40
17,259
6,053
23,525
0.540
Design Volumes:
Elevation
Volume (ac-ft)
Invert
4977.00
0
WQCV
4978.93
0.051
100 yr WSE
4980.96
0.368
Total Pond Volume Required
0.419
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RECORD POND VOLUME PROVIDED
Subdivision BROOKDALE SENIOR LIVING
Location FORT COLLINS
Volume=1/3 x Depth x (A+134{A*B)"0.5)
A - Upper Surface
B - Lower Surface
Basin A (Northeast Pond)
Project Name: CLARE BRIDGE
Project No. 39674.00
By: MSB
Checked By:
Date: 12/9114
Stage
Llecation
Surface Area
(square feet)
Volume
(cubic feet)
Cumulative Volume
cubic feet)
Cumulative Volume
(acre feet)
INVERT
4978.30
0
0
0
0.000
4979.00
1,204
284
284
0.007
4979.50
3,633
1,155
1,439
0.033
WQCV
4979.90
5,855
1,879
3,318
0.076
4980.00
6,438
615
3.933
0.090
4980.50
9,205
3,890
7,923
0.180
4981.00
10.500
4,923
12,746
0.293
4981.50
11,358
5,463
18,209
0.418
4981.80
11,887
3,484
21.693
0.498
SPILL
4982.50
13,113
8,749
30,442
0.699
DESIGN VOLUMES:
Elevation
Volume (ac4t)
Invert
4978.21
0
R'QCV
4979.55
0.039
100yr WSE
4981.06
0.292
Total Pond Volume Reguired
0.331
X:'3960000.dN%74WlExcdll)r,MPV -ha (l l-1 .�14)il%74.p0 Dnimp_Caks_Asbtia Xb Page 1 of l 12/102014
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AS INDICATED ON THE PLANS, BUT CONTRACTOR SHALL CALL HALL O N
UTILITY COMPANIES BEFORE EXCAVAGOV FOR EXACT LOCATIONS LL ED
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4) ALL WCPX 10 BE ACCpRLSTED IN STRICT ADHERENCE MTH ALL U ~ DO n Z
LOCAL ORDINANCES, CITY OR STATEZ Ar n o
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YOU EXCEED 39 N ANY DIRECTION 'LIE MAXIMUM RUNNING SLOPE BE f =
ANY WALKWAY IS 5% AND ME MAXIMUM CROSS SLOPE 15 2i
9) ALL EXISTING EASEMENTS SHOWN WERE DEDICATED BY THE PUTT FOR
THE STERLING HaY P.U.O. AND AGNELLCARTs MEMORY CARE.
10) SPOT ETFVALONS BROWN M BOUNDARY CORNERS ARE FOR a" USE V CD
SAY AMID NOT To BE USED FOR CCWSTACTM THE BASS AM ALL F'l4
ELEVATIONS DURING CONSTRUCTOR SHALL BE THE PROJECT
Nl1:.IMMK(S) USED W ME COVER PAGE,
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JOB No. 39674.00
I BY:
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