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E N T R A N C O
9/23/02
Stormwater Engineer
Development Review
Stormwater Utility
City of Fort Collins
700 Wood Street
Fort Collins, CO 80521
Re: Drainage Certification.
City of Fort Collins Stormwater Utilities-
STORMWATER
RECEIVED
SEP 2 6 2002 A'Kw
I hereby certify that the drainage improvements associated with the Poudre Health
Services District Building was constructed in general accordance with design plans and
specification dated 10/17/01. If there are any questions regarding the design as built,
please feel free to contact me at (970)221-3600.
Respectfully Submitted,
Stacy J Gowmg, PE Tt ?�a .i S
Colorado Professional Engineer o. �
For and on Behalf of Entranco, Inc. Z
345 East Mountain Avenue
Fort Collins, Colorado
80524
Telephone 970 221 3600
Fax 970 221 9 33
SEP-19-2002 THU 08:00 AM HEATH CONSTRUCTION FAX NO. 9702212907
P. Ol
HEATH
Basil Hamden
City of Fort Collins
Stormwater Division
Fort Collins, CO
R.C. HEATH CONSTRUCTION CO.
P.O. DRAWER H -141 RACQUE71E DR.
FORT COLLIHS, CO 80522 (50524)
(970) 221J195 FAR (970) 221.2907
RE: Pondre Health Services Construction (Permit # B010098)
Dual 30" HDPE Pipe Installations
Dear W. Hamden:
September 19, 2002
Heath Construction has postponed the installation of the dua) 30" HDPE pipes that will go from the edge of
Bristlecone Drive to the existing storm box. This work was postponed for technical reasons that have recently been
resolved. Heath Construction will proceed immediately with the work. However, this work can not be completed by
the Owner requested occupancy date.
Heath Construction would like to establish an escrow for the value of this work plus a 25% contingency so that a
Temporary Certificate of Occupancy can be obtained. The Work will be completed by October 31, 2002. The
amount of this work is calculated as follows:
Dual 30 HDPE LINE INSTALLATION ESTIMATE
Costs per Boone Construction:
$5,145
Pipe
$1359
Beddingrock
$6 45
ui ment Rental & on
$706
Concrete & Flow Fill
$1218
Trench Box
$14 877
Total Construction Costs
3,719
Contingency
$18,596
Total Escrow Requkement
I have attached a breakdown of the costs for the Dual 30" line that were received at the beginning of the project from
the Earthwork subcontractor for your review.
Thank you for your time and consideration of this request.
Respectfully
erry W. Been
Project Manager
www.111"AlHCOR5TKUCTIO coM
SEP-19-2002 THU 08:00 AM HEATH CONSTRUCTION
W—mi-04-02 12.04P BO XCAVATINO INC
FAX NO. 9702212907
970Z,2,40994
P. 02
P.O1
Boon Consuuctkm
PO Box 270262
Fort CoUin& CO $0527
pw
Rock
Lquipmenr
Corte
Trench box
TOTAL
Boon Coior�,
Tustin Boyd
R C Heath Coasumlon Inc.
Pondre lleath 9wviccs
30" Storm Sewer
$5,144A7
$1,_358.92
$6,450.00
5705.88
$1.217.67
$14,976.94
DRAINAGE CERTIFICATION FORM
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/A" for items that are not applicable to the property that
is being certified.
A. Drainage facilitice certification
.1. Pond Certification
-volume verification
a. topographic records and volume,
b, cross -sections and spot elevations
-positive fall to pan.
-side slopes
-invert elevation
-spillway elevation
i
-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)
-dimensions and cross-section verification
-longitudinal slopes and side slopes
-spot elevations
-permanent erosion control measures
��Js
(drop structures, riprap, etc....)
.-tie-in to pipes, pans, curbs, etc....
-weir size (elevations, size, opening, etc...)
-"`tom
-available freeboard
-landscaping infringement on swales
3. Pipes
-size and type
O«
-slopes (as -built and comparison to minimum
O YS
0.4% slope).
-pipe capacity calculations if slopes are
significantly altered l
-invert elevations
-installation and backfill material
-cover
-encasement and clearance from other utility
lines close by
�Q
-joints
4. Concrete an Channels
-size
Q&
-slope
_OK
-super elevation
-cross-section
f
-thickness
-elevations
K
S. Inlets
-size and type
-size of opening (or name of standard used)
-grate elevation
-invert elevation
-box size
6. Cross vans
-size
-type
-grade
-elevation
-cross-sectional depth
-tie-in to curb and gutter
7. Culverts
-size
-type
-invert elevation
-headwalls
8. Underdrains
-size
-type
-cover
-backfill
-geotextiles
A
�A
AdA
4
a
-cleanouts
9. Curb cuts
-size
-tie in to Swale, pipe, etc....
B. ,Certification of Grade Elevations Adjacent to
Drainage Facilities:
-minimum opening elevations
-top of foundation elevations
-comparison to 100 year WSEL's �K
(Freeboard requirements and flocdplain issues)
C. Certification of Erosion control Measures:
1. Permanent Measures:
-Permanent vegetation (6" bare spots and weeds
under control) pVL
-riprap
-riprap bedding �k
-drop sections
-sediment basins/water quality pondsQ
-netting mats/blankets
-mulching
2. Temporary Measures:
-mulching
-inlet filter installation
-check bale dams
-seeding and temporary vegetation
-silt fence
D. Site Cleanup After Construction
-construction clean up
-smoothing of ruts
-reseeding
E. Statement of Compliance
This certification is signed and stamped and by signing this
form the engineer(s) attests that to the best of his 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 Profeeeional
Engineer.
Poudre Health
Prepared by Tim Mather
Entranco Inc.
Detention Pond Verification Calcs.
Design Volume Required for:
WQCV = 0.022 ac-ft
Detention Volume = 0.18 ac-ft
Total Detention
Volume Required = 0.202 ac-ft @ Elev. = 4975'
As -Built Detention Volume
For Detention Pond:
Major Storm (100-year Event):
Elevation
(feet)
Area,
(ft)
Areaa e
(ftz)
Areal
(ft)
Volume,
(ft)
Volumec„m
(ft)
Volumec„m
(ac-ft)
69.5
1.81
0
0
70.0
1.81
18.575
35.34
9.29
9.29
0.000
70.5
35.34
133.29
231.24
66.65
75.93
0.002
71.0
231.24
338.675
446.11
169.34
245.27
0.007
71.5
446.11
544.6
643.09
272.30
517.57
0.015
72.0
643.09
752.125
861.16
376.06
893.63
0.026
72.5
861.16
960.565
1059.97
480.28
1373.92
0.040
73.0
1059.97
1170.22
1280.47
585.11
1959.03
0.057
73.5
1280.47
1464.42
1648.37
732.21
2691.24
0.078
74.0
1648.37
2087.64
2526.91
1043.82
3735.06
0.108
74.5
2526.91
3737.17
4947.43
1868.59
5603.64
0.162
75.0
4947.43
6471.39
7995.35
3235.70
8839.34
0.256
See Design Pond Volume Calculations Next Page
Page 1 of 2
9/30/2002
This total pond volume
exceeds design volume
Design Volume Calculations
For Detention Pond.
Major Storm (100-year Event):
Elevation
Area
Depth
Volume
CumulatiVE
WQCV
Volume
Volume
(feet)
(Acres)
(feet)
(Ac-ft)
(Ac-ft)
(Ac-ft)
4969.5
0.001
0.5
0.001
0.001
4970.0
0.003
1.0
0.006
0.007
4971.0
0.010
1.0
0.014
0.021
4972.0
0.019
1
1
1 0.022
1.0
0.025
0.024
4973.0
0.030
1.0
0.037
0.061
4974.0
0.044
1.0
0.114
0.18
4975.0
0.185
0.18
1.0
0.230
0.41
4976.0
0.276
Page 2 of 2
WQCV (4972.05 ft)
Less WQCV
Detention Volume Required for
100-year Event (4975.0 ft)
Spillway Elevation (4975.1 ft)
/3
LEGEND
UNE
LINE
ACRES Q PoNT
-•-•-- STORM
----PROPERTY
AREA
-�---- SANITARY UNE
-^-•- NEW WATER UNE
EXISTING CdI
---- WATER UNE
- — - NEW GAS UNE
ACRES DESIGN
POINT
----- CAS UNE
NEW SWRARY UNE
O
DRY CREEK ROOOPWN
CROSS SECTION UNE
-- - TELEPHONE LINE
-- NEW ELECTRIC UNE
'
---
DRY CREEK FLOODPINN BOUNDRY UNE
ELECTRIC UNE
® NEW STORM UNE
r—r NEW ROOF OWVN
M CREEK FLOODPWN EFE UNE
�N FLOW DIRECRON
SUB -BASIN FOR COUNIRY CLUB
CORNERS, FOURN RUM. P.U.D.
SUB -RESIN BOUNDRY
RETNNNG WALL /
R6
/1p
/7
S 20' CONSTRUCTION \\
LANDSCAPE II --+ �"si.eZ `\n�___ _EAST_ _-___-\
\U \
` \\
NEW DUAL 30" HDPE INST PER
"COUNTRY CLUB CORNERS THIRD FILING PUD"
SHEET 12 OF 42 "STORM DRAIN PLAN AND PROFlLES" X WM \
PHASE 2, DATED FEB 1, 1996 BYE \
LANDMARK ENGINEERING, LTD.
STOP
F______________________________i101v______-
T .
rw.Y�rr +lolE�� Moo
_ i
R
ELEC. % EX 6" SAN
VAULT 1 EX SAN MH
__- RYDRANT 1 1 NV: 4969.1
r.^^ EX 8" SAN -
EX 8" WM J ~
4
\
415, , v v�p ':vv7
3
/ ROOF DRHLJ \ \ \
M C12THROUGH CURB; \\
I \
F�1wv1W _ \
/
_ .. .♦
r.SB95f
EX
SAN MH
---_
EX. ELEC.
RIM:
4973,96
_�
--- _ VAULT
INV:
4968 28
NEW REDDNING-WA4L
Sly E MOUMTYN AYEMR
SEE LANDSCAPE PLANS FOR red c, me. ca 80524 UM
SEEDING AND MULCHING Phe:.: 270 221-5NR
Fe.: 270 UI-vw
REQUIREMENTS. E-men: I:de4MalNRerawr
ASPHALT
CURB
II VAULT
,/ } PEDS POUDRE HEALTH
SERVICES
District Building
EX 8"
SAN
i p
1/
``I _
IF DRAINAGE
LOT 11 PLAN
\ r 1 `II•
\
PARR INN Date: 10-17-01
AREA
I III v — Designed: GEM
Drawn: RGS
— Approved: MOW
p I � I Cadtl File CSDRNN.DWG
w I I G
z V
�CONCR TE 7 ® DATE NOTES DRAWN
TRICKLE PAN C12
C. 6-03-01
VET
LOT 12 7-25-01
NEW RETAINING 8-10-01
\ 18"MIN. WALL C12 10-17-01
DIA. RIPRAP
11-16-01
—I EMERGENCY C1YC. PE05.
\-y-SPILLWAY _ ^^^
EXIST. STRM DRAIN
P BRISTLECONE DR. (60' ROW)
EX'ST )iG 4' SOCA-
DETENIOx1 POND
SOMMA TABLE
10-YEAR
STORM EVENT
QSOE
QPIPE
QDEM4TION
1.39 Cm
0.29CF5
1.07 CPS
100-YEAR
STORM EVERT
QSm:
QPin
QDETENIION
6.00 CPS
0.33 CPS
5.67 CPS
LOT 1 OF COUNTRY CLUB CORNERS
FOURTH
RUM P.V.D. APPROVED
DNA- DRNHICE STUDY
BRaME CONE SUMMARY
AT
10-YEAR STORM EVEN
QSTREET ORK
Q10
QUflENLIDN
8.5 CPS 20.24 CPS
N.87 CPS
31.13 CPS
100-YEAR STORM EVEN
QSIREET QPIPE
Q100
QDEIENION
23.H CPS 24.39 CPS
108.29 CPS
III CM
ONOTE: 1.73 Cis ALLOWABLE RELEASE RATE
FROM C4
AND
PORTION OF C3
AS PER APPROVED O NAGE SNDY
FOR LOT
1 OF
COUNTRY CLUB
CORNERS FUUR H FILING P.U.D.
20 10 0 20 40
1" = 20"
UTILITY
PLAN APPROVAL
CITY
OF FORT COWNS. COLORADO
APPROVED:
pt) Eeynse
CW
CHECKED
BY'
Fib evd �ulmta OYetJ
AY
CHECRED
BY'
8ta�m��b UWIt)
hl.
CHECKED
BY
PVY� mE Peme�e®
M1te
CHECKED
BY
N4
CHECKED
BY'
OJe
DRAINAGE PLAN
Scale: 1" = 20'
Sheet No.: C5 of C12