HomeMy WebLinkAboutLot Certifications - 11/07/2007 (3)Citti or, Fort CiWi!"
CERTIFICATION OF LOT GRADING
Pursuant to City Code § 26-544 and
City Land Use Code § 3.2.2 (e)
Date: //-2-07
Permit Application No. JJ/J��
Address: 1121 1�7zlLsceey S77
Lot: / Block: /
Subdivision: ,51G.t/Eid CRkwJ¢ f N
(,(Print) �'i�°ALE C�C a Colorado registered professional engineer,
verify that the above referenced property in the City of Fort Collins, Colorado, has been inspected by me
or someone under my direct supervision, and verify construction of all stormwater facilities and grading is
complete, and the elevations and drainage patterns shown on the attached drawing(s) which were
developed from a survey performed on (Date) 11- , accurately and truly depict the
elevations and drainage patterns as they existed on the date of the survey. Based on this information, I
certify that (check one):
The elevations and drainage patterns of the lot/site are in substantial conformance with the City
approved drainage and grading plan for the property (information attached). SEE NOTE.
c The elevations and drainage patterns of the lot/site as measured are in general conformance with
the City approved drainage plan with exceptions (information attached). In my professional
judgment the elevations and grading of the lot as constructed is functionally adequate and will
allow for stormwater drainage consisten
SEE NOTE.
By:
NOTE:
A COMPLETE certification must be submitted, including but not limited to drawings of the IoUsite showing the approved design and
as -built surveyed elevations of all structures, drainage and grading features (e.g. swales, retaining walls, lot corners), written
information/explanation of discrepancies, etc. to:
Fort Collins Utilities (970) 221-6700
700 Wood Street
Fort Collins, CO 80521
At Least Two Weeks Prior To Requesting A Certificate Of Occupancy For The Property
Rev. 111106
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November 7, 2007
Mr. Jay Barber
City of Fort Collins
Storm Water Utility
700 Wood Street
Fort Collins, CO 80521
Re: Detention Pond and Drainage Certification for Agnew Carwash
JR Project 39565.01
Dear Mr. Barber,
This letter certifies that the constructed drainage facilities for Agnew Carwash are in general
conformance to the approved drainage and grading plan. Drainage facilities include all
detention and water quality ponds, the storm drainage pipe system, drainage swales, and
permanent and temporary erosion control measures. JR Engineering has verified the
adequacy of the following items through field inspections and surveys.
1. Detention pond volumes, bottom and side slopes, inverts and spillway
elevations, outlet structures
2. Drainage swale capacities, concrete trickle channel sizes and slopes
3. Erosion control measures
The detention and water quality pond and outlet structures were surveyed on November 7,
2007. The results of these surveys indicate that the record detention and water quality pond
has adequate volume and the pond outlet has been constructed with positive drainage into the
pond's outlet structure. The pond's outlet structure was designated as a water quality and 100-
year detention facility. Enclosed with this letter you will find record contour drawings and
stage -storage calculations for the pond. The required water quality capture volumes (WQCV)
and 100-year detention volumes were obtained from the Construction Drawings for Agnew
Carwash by Jones Engineering 3/30/07 delivered to our survey department for construction
staking June 1, 2007. The Pond and all of its structures appear to have been constructed in
such a manner as to accomplish all of their intended purposes.
The major curb cuts and trickle pans were also surveyed. The results of these surveys indicate
that all of the constructed swales were built to plan.
The water quality orifice plate and screen were built to plan according to the outlet structure
detail on page C7 of the construction plans. The as -built dimensions WS and LS, width and
length of the outlet structure, were found to be larger than the plan dimensions. The plan
dimension WS (width) was 12" the as -built dimension was 4'. The width of the outlet
structure was increased to accommodate the planned 18" RCP outlet pipe. The plan LS
dimension was 24" the as -built dimension was 4'. The elevations of the outlet structure were
built according to plan. The emergency overflow weir was also constructed per plan with the
Mr. Jay Barber. October 26. 2007
Page 2 of 2
spillway elevation being 32.5 as shown on enclosed exihibit. The 100-year detention volume
required is 1229 cubic ft. and 1211 cubic ft. is provided at a stage of 32.0 (ft). The difference
in the required volume and the provided volume is very small and is assumed to be negligible.
The freeboard provided from the spillway to the top of berm is approximately 1'. In all, it is
determined that the Pond is adequate and will perform as intended. Note that the elevations
for the pond grading may be found as depicted on the enclosed exhibit provided with this
submittal and may change subsequent to the date of the surveys due to natural and/or artificial
actions, reseeding and landscaping.
JR Engineering inspected the permanent erosion control measures and found that riprap,
trickle pans & water quality structures have been installed per the design plans. JR also
observed the temporary erosion control measures such as silt fence and inlet protection which
all appeared to be in good condition at the time of inspection. All areas of overlot grading
were reseeded.
In conclusion, all of the drainage facilities for Agnew Carwash have been constructed in
general conformance with the approved plans. I find that the storm system as -built, will
operate as depicted on the construction plans. If you have any questions or comments, please
contact me at 970.491.9888.
Prepared by:
ustin Fecteau
Design Engineer
Reviewed by:
Mike Walker PE
Project Lead
37687
1e41
X:\3950000.ali\3956501\Word\Letters\As-built Pond Cert.doc
AS -BUILT POND VOLUME
AB-BUILT`P.OND
WSEL
X
Stage
(ft)
Surface,'
Area
(ft2)
Incremental
Storage
(sq-ft)
Total
Storage
(cubic-ft)
30.20
8:01
30.40
78:62
7.448
7.45
30.60
171.39
24.406
31.85.
30.80
348:09
%915
82.77
31.00
'528.86
87.067
169.84,
3110
724:28
124.803
294.64-
31.40
924.66
164.487
459.13
31.60
1134.43
205.552
664.68
31.80
1361.5
249.248
913.93
32.001
1614.31
297.222
1,211.15
32.201
1891 : 361
350.202
1561.35
POND VOLUME FR 'M CONSTRUCTION DRAWONGS
.REQUIRED VOLUME
1,229 CF
PROVIDED VOLUME
1,632 CF
WQ WATER SURFACE ELEVATION
32.00
100—YR 'RELEASE 'RATE
5.1
10 5 0' 10
SCALE:. 1" = 10'
POND AS (BUILT 11-07-07
AGNEW CARWASH
J09 NO. 39565.01
11-07-07
SHEET 1 OF 1
J•R ENGINEERING
AW801mCompany
2fi20 East'Rpsped R341 %k 190• Fad Cft C0 OW
1/4" PLATE, WELDED
TO GRATE, WITH
3/8"x6"'THREADED BOLT
TO FASTEN GRATE DOWN
(TYP. OPP. (SIDE)
i
m
3
OPTIONAL CONCRETE WING WALL (TYP.)
AND PAD (END OF PAD TO MATCH
END OF WING WALL)
Ls
s
I
TRASH RACK
51"61" GRATING
(3/8" ROUND OR
B TWISTED CROSS D
BARS AT 3" O.C.,PPP
WELDED TO 1"zAT
BEARING BARS AT
2 1/2" O.C.)
3'-6"
3/8" ROUND OR
TWISTED CROSS
BAR
BEARING
BAR
W
ErN
j
0
3
u,
LiN
>
io
N
o
CENTERLINE OF
OUTLET PIPE
FLOW
CONTROL
PLATE
C
1�
3/8`'x6" BOLTS 12" O.C.
TO HOLD HINGE IN PLACE
2 1/4" FROM EDGE OF
GRATE (TYP. OPP. SIDE)
CL
F
o�
11
1
2"
LIP
(TYP)
T \-1/4" METAL PLATE
TO COVER OPENING
WELL SCREEN N0: 93
(FASTEN WITH 3/8"z6" L (U.S. FILTER STAINLESS A B TREADED BOOTS) D
STEEL OR EQUAL) PLAN,
1/4" PLATE, WELDED TRASH RACK ELEV. C
TO GRATE, WITH (NOTE 5) 4 OR 3.
3/8"x6" THREADED BOLT 1 �-
ELEV. B TO FASTEN GRATE DOWN
1
3/8°4" BOLTS 12 O.C.
TO HOLD HINGE IN PLACE,
2 1/4" FROM EDGE OF SPILL
GRATE (TYP. OPP. SIDE)
#4®12' OUTLET PIPE
WELL SCREEN NO. 93
(U.S. FILTER STAINLESS
o STEEL OR EQUAL)
3
FLOW CONTROL
CONCRETE PAD WITH USE PLATE
OF OPTIONAL WING WALLS 3„ 100-YEAR OUTLET 3 1/2"
a ORIFICE PLATE 'I 1/2" 3" CLR.
CLR.
ELEV. A KEY
_ jT
/ - -
I DOWEL WITH USE OF /#4@L a" cO N CONCRETE PAD N4L@12"
SECTION C-C
U
STEEL CHANNEL FORMED
INTO CONCRETE SIDES
Wo
3/8% 1" FLAT
BAR HOLDING
FRAME
WELL SCREEN
NO. 93 (U.S.
FILTER STAINLESS
STEEL OR
EQUAL)
STAINLESS STEEL ANCHOR BOLTS OR
INTERMITTANT WELDS ON TOP AND SIDES
WELL SCREEN
SECTION A -A
Wp
(Wo 4 )
0 0 0
•
0 0 0
o o cr
0 0 0
o o o
0 0 0
Q
0 0 0
G°
a
0 0 0
—WATER QUALITY (WQ)
HOLE (TYP.), SEE
TABLE
d �
�1/4" (MIN.) THICK
STEEL FLOW CONTROL
PLATE
BOTTOM ROW OF(TYP) \-STAINLESS STEEL
HOLES TO BE AT -�}-{� ANCHOR BOLT (TYP.)
INVERT OF PLATE _/
FLOW CONTROL PLATE
#4@12"
&8MO
4 P O.C.
12"
LAP
#4 DIAGONAL
(TYP•)
4%
L
j)4®12" O.C.
SECTION D-D
GENERAL NOTES
1. CONCRETE SHALL BE CLASS B. MAY BE CAST -IN -PLACE OR PRECAST.
2. REINFORCING, BARS SHALL BE EPDXY COATED AND DEFORMED; AND SHALL
HAVE A MINIMUM 2" CLEARANCE.
3. STEPS SHALL BE PROVIDED WHEN VERTICAL DIMENSION EXCEEDS 3'-6'
AND SHALL BE IN ACCORDANCE WITH AASHTO M 199.
4, ALL TRASH RACKS SHALL BE MOUNTED USING STAINLESS STEEL HARDWARE AND
PROVIDED WITH HINGED AND' LOCKABLE OR BOLTABLE ACCESS PANELS.
5. TRASH RACKS SHALL BE STAINLESS STEEL_ ALUMINUM, OR STEEL. STEEL TRASH
RACV5 SHAI I PF HnT flip CAI VAN17Fn AN!) MAY PF HIT 'POWDFR PAINTED
AFTER' GALVANIZING.
SECTION B-B
'LEGEND
L
A SECTION LINE A -A (ARROWS
POINT IN DIRECTION SECTION
IS VIEWED)
ABBREVIATIONS
CLR. CLEARANCE TYP. TYPICAL
DIA. DIAMETER Wo WIDTH OF CONCRETE OPENING
ELEV. ELEVATION Wp WIDTH OF PLATE
INV. INVERT WO WATER QUALITY
MAX. MAXIMUM Ls LENGTH OF STRUCTURE
MIN'. MINIMUM Ws WIDTH OF STRUCTURE
O.C. ON CENTER # NUMBER
OPP. OPPOSITE ® AT
nCCICpI Ac_AI III T
ELEV. A (POND INV.)
30.00
30.00
ELEV. B (WQCU ELEV)
32.00
32.00
ELEV. C
32.50
32.50
SPILL ELEV.
32.50
32.50
DwQ (12" MIN.)
24"
24"
Ls
24"
48"
Ws
12"
48"
Wo
6"
6"
HOLE DIA.
5/16"
5/16"
WQ
# OF ROWS
6
6
b OF COLUMNS
i
1
OUTLET STRUCTURE AS -BUILT
AGNEW CARWASH
JOB NO. 39565.01
11-07-07
SHEET 11 OF 1
J-R ENGINEERING
AWnbim Caffp"
2620 East Pmsped RoA &k 190• Fad iUK 00 8W
970-0-9888 • Fax 970-494-9984 • wwwtaeerigoorn
SITE AS=BUILT
RECORD SURVEY
AS OF MOo V ENBER 79 20077
OF G^QGbEW CQR�'�/e ASH
30
10
0
20
SCALE:
1' -
30'
•.iTi11LT - SPOT ELEVATION
MANAGE INFECTION
ME ATTACHED DRAWING SHOWS THE ELEVATION AND
DRAINAGE PATTERNS THAT ARE THE REGISTERED
PROE59OPL ENGINEERS CERTIFIED FINDINGS OF THE
RNISHEO GROUND GRADES FOR THE ABOVE DESCNBED
PROPERTY AND ARE IN GENERAL CONFORMANCE TO THE
APPROVED DRAINAGE AND GRADING PLAN EXCEPT AS NOTED.
THE ELEVATIONS AS DEPICTED HEREON MAY CHANGE
SUBSEQUENT TO THE DATE OF TEE SURVEY WE TO
NATURAL AND/OR ARTIFIOAL ACTIONS.
0
MICHAEL DWAINE WAVER PE J0%G87
FOR AND KHALf
Ci JR ENGINEERING LLC