HomeMy WebLinkAboutLot Certifications - 08/04/2004 (7)$TEWART&ASSOCIATE$
Consulting Engineers anti Surveyors
August 3, 2004
Mr. Jay Barber
Stormwater Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Jay,
RE: Lots 3 and 4, Garth Commercial Plaza
Per our phone conversation this morning as to the trash rack on the Erosion Control Box by
Mason Street: the developer said it would be in place when I was out on site doing the grading
certificate. He knows it needs to be completed.
The developer is including a $1,500.00 escrow check made out to the City to insure that the trash
rack be installed to plan specifications.
If you have any questions regarding this project please let me know.
Sincerely,
,rr°^ O
T
Franklin D.
FDB/meh
James H. Stewart and Associates, Inc.
103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO B0522
970/482-9331 • Fax 970/482-9382
GARTH COM PLZ L3-3 TmhRkdm
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$TEWART&ASSOCIATES
Consulting Engineers anti Surveyors
STORMWATER
RECEIVED
JUL 2 9 2004
July 29, 2004
Mr. Jay Barber
Stormwater Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Jay,
Please find enclosed the "AS -BUILT" grading on Lots 3 and 4, Garth Commercial Plaza, Fort
Collins, Colorado.
The lot grading on the East parkway lot is in substantial compliance with the designed grading
and erosion control plan. The finished floor is as designed.
The lot grading on the West parking lot has been revised by the owner to reduce the grades to the
building. The "AS -BUILT" grades are as shown.
The detention pond volume was recalculated to verify that the required volume of 3,836 cubic
feet was obtained. The new pond volume is 3,687 cubic feet to elevation 5,039.6, which is the
spillway elevation. After discussing the shortage of volume, 149 cubic feet with Glen Schlueter
of the City's stormwater department it was decided that the grading was okay. All runoff will
flow as originally designed for the West parking lot.
If you have any questions or need any more information regarding this "AS -BUILT" plan please
let me know.
,r r1
,
Sincerely,
Franklin D.
FDB/meh
James H. Stewart and Associates, Inc.
163 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
GARTH LL,3-4b.aa 970/482-9331 • Fax 970/482-9382
DETENTION POND 6 HIGH WATER LINE
VOL. = 1/3 (AREA ABOVE) (DIFFERENCE IN COUNTOUR ELEV.)
2. FOR THE REMAIMDER OF THE VOLUMES BETWEEN CONTOURS (SECTION 9.2)
VOL. = DEPTH/3 (A + (AB) ^.5 + B) FOR: Uniform Sides sec.(9.2)
3. HWL=(VOL.REQ.—VOL.LOW CUML)*3/(AREA LOW+AREA HIGH+(Iow area*high area) ^.5)
ORIFICE SIZING
ORIGINAL DESIGN DATA
0.25 = Allowable Des. Release Rate(cfs)
37.90 = Flowline Orifice Elevation(ft)
0.65 = Orifice Coefficient (Cd)
1.72 = Avaliable Driving Head(ft)
VERT. CIRCULAR PLATE
..........
... ... . .. ..
Outlet Areas .inches
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . .
............... - .... ........... .............
..............
H d ng..Head ft
Ir 61 Actual yqrau
11 VERT. SQUARE PLATE 1�
NOTE: 1. VERT. PLATES WILL BE PLACED
AT PIPE FLOWLINE
.625 EACH INLET
SRECEIVEDfER
JUL 2 9 2004
10 0 10 40 60
GRAPHIC SCN.E - FEET
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SB', 5 { e' I" I$ �' e ' o STORM DRAIN PROFILE EAST PARKING OT Se 6 .,,pMw.n „,me„ P.e a... > 1 m
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SU8BA5/N 5 0,?= 1.07 ICES 010—_ 1.83 ICES 0100— 4.68 ICES I _I' rm or w.rz adu NOTES FROM THE 100-vEAR STORM. atoW
I
AREA - 0.47 ALRES S I I .,
•' CONCENTRATION POINT AT INLET 1 !,[ •,1 L'_ --_ 6" L CONSTRUCT STRAW BALE DIKES AROUND ALL City of Fort Collins, Colorado _
POND 100-YEAF' HIGH WATER LINE 37.95 1 ."FI -- INLETS AND WATER DUAL CONTROL o
ttt UTILITY PLAN APPROVAL .n, VERTICAL RESTRICTION PLATE ON INLET No 1 j ; STRUCTURE AND LEAVE Ii PLACE UNTIL
RESTRICTION PLATE OPENING- 1.0" RADIUS
f CONSTRUCTION IS READY OR PAVING V
POND RELEASE SATE 0.24 CFS I' rLi : AIR
M G.6z" Gra aPPROVEO: c;rz PO�nr mI•
`+ 1 2, CONSTRUCT SILT FENCE IN THE SOUTH.
r' p NORTH, AND EAST SIDES F SITE DURING CHECKED BY.. AI► �''In.
SUBBASIN 6 02= 0, 99 CFS Q 10= 1.69CFS 0100= 4.34 CFS �•� ^ A,
''. (( n CONSTRUCTION. ;��I ,^�
AREA = 0.49 ACRES I S i m u ¢ J. THERE IS A 6' WIDE POE IC ACCESS CHECKED By, MEAN,
1-P s y 1-f-Q� �T
CONCENTRATION POINT AT INLETS 3 AND 4 n ^' EASEMENT, A 10' UD(JT` EASEMENT swmvn wen dv.e.
POND 100-YEAH HIGH WATER LINE Im` AND A IJP DRAINAGE EA EMENT CHECKED BY Pa.,, at cw NyDa
HORIZONTAL RESTRICTION PLATE ON BOTH INLET No 3 AND 4 j I I ALONG THE FAST ONE 0 tors 3 & 4
RESTRICTION PLATE OPENING- 0.625" RADIUS AT EACH INLET I HORIZONTAL RESTRICTION PLATE DETAIL CHECKED Br
POND RELEASE RATE 0.25 CFS AREA INLETS 3 AND 4 NTS CHECKED By. �Hx E DRAWN sxE,coH7 Dm