HomeMy WebLinkAboutLot Certifications - 04/24/1998 (2)FPM
April 10, 1998
City of Fort Collins
Stormwater Department
Fort Collins, CO 80525
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RE: Drainage Certification -
Engineering Data Management
Lot 5B, Collindale Business Park, 3' Filing
Dear Gentlemen,
PARK ENGINEERING
CONSULTANTS
We have received the `As -Built' survey from RJL Surveying, and have analyzed data for the storm
drainage improvements and have found the improvements to be in compliance with the design.
Please see the attached information and map which supports the information.
The only difference to the designed pond and as -built pond is a headwall replaced the release
structure. Since the headwall with the required 3" diameter oriface controls the required release
rate, we find the headwall is in compliance with the design. If you should have any questions
concerning the provided information, please call us at your earliest opportunity.
Respectfully Submitted,
F-O
Shawn Smith, P.E. P.E. No. 30630 cc: fi, B3114aboakwpol.A.s��NAI E
420 21 st Ave. Suite 101 • Longmont, CO 80501 9 (303) 651-6626 • FAX (303) 651-0331
PARK ENGINEERING CONSULTANTS
1240 Main Street
LONGMONT, COLORADO 80501
(303) 651-6626
Fax (303) 791
TO., 4
WE ARE SENDING YOU ❑ Attached ❑ Under separate cover via
❑ Shop drawings ❑ Prints ❑ Plans
❑ Copy of letter ❑ -Change order . ❑
DATE
! � _
T
JOB NO
ATTENT16N
RE:
the following items:
❑ Samples ❑ Specifications
COPIES
9ATI
NO.
DESCRIPTION
�j
THESE ARE TRANSMITTED as checked below:
❑ For approval
(/t(For your use
/❑ As requested
❑ For review and comment
❑ FORBIDS DUE
REMARKS
❑ Approved as submitted
❑ Approved as noted
❑ Returned for corrections
❑ Resubmit
❑ Submit _
❑ Return _
copies for approval
—copies for distribution
corrected prints
19 ❑ PRINTS RETURNED AFTER LOAN TO US
COPY TO
SIGNED: �
If enclosures are not as noted, kindly notify us at once.
DETENTION POND
=> STAGE - STORAGE
ACCUM.
ELEVATION
AREA
VOLUME
VOLUME
FT
FT^2
FTA3
FT^3
4951.40
0
0
1250
4952.00
4168
1250
4952.42
4461
<= 10-YEAR
7611
4953.00
11054
8861
4953.01
8971
<= 100-YEAR
4503
4953.40
11461
13364
RELEASE STRUCTURE
100-YEAR:
ALLOWABLE RELEASE RATE =
0.30
CFS
C =
0.65
H =
1.61
FT
ORIFACE RELEASE
Q10U = C SQRT 2 H
A = 0100/ C SQRT 2 H =>
0.05
FT"2
R = 12' SQRT I =>
1.441
IN
D = 2R =>
2.883
IN
USE =>
3
INCH DIAMETER ORIFACE
csw
111
\ % 49 ' 4952.50
IANX
1 %1x95390 ' 51 Ja.OD. r
74
UO �M RMw
U
/OR , 1 2• ...
c6WCRETE „ ( 6• � 1 I I
iIl
B• UERMCAL CURB (CATCH PAN) 1 I
x.T1
1/4•R 1 1/2
,H IIII
CON0SIE ,•
1 1It
91 A
e• YERTN`.AL auEB (xSll PAN) 1
III 3
T 1 I 1 to to
CMIDRPAN DETAIL 1 I '�, ETE
MT S. '
OFTENTI0N POND L
ELEVATION (FT.) AOMMUTATVE WLUME (CF.) 1''
4951.40 0
4952.00 1250
4952.42 4461 <- 10—YR NOL
4953.00 M61
4953.01 8971 <= 100—YR VOL. -
4953.N0 13364 <— TOP OF POND
µLOWABIE BE EASE RATE
10 k 100—YR = 0,30 ch
He
�OON OR API OWN.
A
Msr w (rmzl %o-'Sx m�mr
1
,�
1� 1
ii
m TTw 4 — 1 I lI' 1
%NfiHAB < 1 /I
34 ( 1 1I 20 0 10 20 AO
II 1 lI ORIGINAL SCALE: Y-20'
j �'� •„ It 1 /blF 4/10/98 RJL SURVEYS
❑ RDL. I % xs If A( l� RIC HEATH/PARK E G.
PROPOSED PARK.DWG
OFFICES. I- 5T0RY \ / Qjl1 i / `; VACANT
9,b55 50. FT.
I '1
11 I
•., 47 I I I Llasnx6 UK, AN
F.F. = 4954.64 2GTE I 1 2 1
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DETAILTYPE WRP RAP ----
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NOTE STANDARD EROSION CONTROL CONSTRUCTION PLAN NOTES 'I
I
JULY. 1996
I 11
1. THE GTY OF FORT COLLINS STORMWATER UTILITY EROSION CIXITRM INSP@CTOR MUST BE NOMIED AT LEAST 24 HOURS PRIO TO
ANY CONSTRUCTION ON THIS SIM
2. ALL REWIRED PERIMETER SILT FENCING SHALL BE INSTALLED PRIOR TO ANY LAND DISTURBING AC➢NTY (STOCKPIUNC STRIPPING,
GRADING, ETC). ALL OTHER REWIRED EROSION CONTROL MEASURES SHALL BE INSTALLED AT THE APPROPRIATE TIME IN THE
CONSTRUCTION SEQUENCE AS INDICATED IN ME APPROVED PROJECT SMEDHULE, CONSTRUCTION PLANS. AND EROSION CONTRM
REPORT
3. PRE -DISTURBANCE VEGETATION SHALL BE PROTECTED AND RETAINED WHEREVER POSSIBIE REMOVAL OR DISTURBANCE OF EMSTNG
YEGETAMIN SHALL BE LIMITED TO TIE AREA REQUIRED FOR IMMEDIATE CONSTRUCTION OPERATIONS, AND FOR ME SHORTEST
PRACTICAL PERIOD OF TIME,
4. ALL SOILS EXPOSED DURING LAND DISTURBING ACT9TY (STRIPPING GRA6ING, UTILITY INSTALLATIONS, STOCKPILING. PWNC ETC.)
SHALL BE KEPT IN A ROUGHENED CONDITION BY RIPPING OR DIMING ALON§ LAND CONTOURS UNTIL MULCH, VEGETATION, OR OTHER
PERMANENT EROSION CONTROL IS INSTALLED. NO SOULS IN AREAS OUTSIDE PRO.ECT STREET RIGHTS OF WAY SHALL REMAIN EXPOSED
BY LAND DISTURBING ACTWTY FOR MORE THAN THIRTY (30) DAYS BEFORE REWIRED TEMPORARY ON PERMANENT EROSION CONTROL
(E.G. SEED/MULM, LANDSCAPING. ETC.) IS INSTALLED, UNLESS OTHERMISE APPROVED BY ME STCRMWATER UTILITY.
5. THE PROPERTY SHALL BE WATERED AND MAINTAINED AT ALL TIMES WRING CONSTRUCTION ACTIVITIES SO AS TO PREVENT
WIND -CAUSED EROSION. ALL LAND DISTURBING ACTMTES SHALL BE IMMEDIATELY DISCONTNUED WHEN FURTIVE MST IMPACTS
ADJACENT PROPERPM AS DETERMINED BY ME CITY OF FORT COLLINS ENQNEE RING DEPARTMENT.
6. ALL TEMPORARY (STRUCTURAL) EROSION CONTROL MEASURES SHALL BE INSPECTED AND REPAIRED OR RECONSTRUCTED AS
NECESSARY AFTER EACH RUNOFF EVENT IN ORDER TO ASSURE CONTINUED IPERFORMANCE OF THEIR INTENDED FUNCTION. ALL P
VACANT
BUMMED SEDIMENTS, PARTMLARLY THOSE ON PAVED ROADWAY SURFACE$, SHALL BE REMOVED AND DISPOSED OF IN A MANNER AND CONSULTANTS 4
LOCATION SO AS NOT TO CAUSE THEIR RELEASE INTO ANY DIUINAGEWAY.
1240 MAIN STREET
7. NO SOIL STOCKPILE SHALL EXCEED TEN (10) FEET IN HEIGHT. ALL SOIL STOCKPILES SHALL BE PROTECTED FROM SEDIMENT LQNG"T CO. 80501 (303)651-66
TRANSPORT BY SURFACE ROUGHENING, WATERING, AND PERIMETER SILT FENCING PNY SOUL STOCKPILE REMAINING AFTER 30 DAYS
SHALL BE SEEDED AND MULCHED.
B. CITY ORDNANCE PROHIBITS TIE FRAMING, DROPPING, OR DEPOSITING OF ENGINEERING DATA MANAGEMENT
FROM ANY VEHICLE ANY INADVERTENT DEPOSITED MATERIAL SHALL BE CLAI
E SOILS ME ANY OTHER ME CUNT A TO Gtt STREETS BY OR IHm IMMEDIATELY BY TIE CONTRACTOR.
AS —BUILT
8