HomeMy WebLinkAboutSite Certifications - 05/10/2002Mr. Jay Barber
City Of Fort Collins
Stormwater Utility Department
P.O. Box 580
Fort Collins, Co 80522-0580
Re: Willow Springs Office Building
Stormwater Certification
Project No. 0819-003
Dear Mr. Barber:
February 7, 2002
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Please find enclosed a completed Drainage Certification Form for the Willow Springs Office Building for
the as -built condition. TST, Inc. surveyed the above improvements on January 8, 2002, as the
contractors constructed them.
The office building had a design finished floor elevation of 4945.65 and an as -built of 4945.75. The
construction of the parking area, curb cuts and grading has been completed as shown on the approved
plans. At the time of the survey, minor grading and landscaping were still required, however the storm
drainage facilities, unless noted below, are in place and should function as designed.
Please note on the attached drawing that the owner/contractor did not build the concrete pan on the north
side of the building. This area was designed to drain into the parking lot and eventually into the detention
pond. The area now includes a small area of the roof drainage and landscape area that drains directly to
Battiecreek Drive, which then drains east to Timberline Road and eventually to the inlets at McClelland
Channel. The area described is 0.0314 acres and generates only 0.22 cfs of runoff. It is our opinion that
this additional flow to the undetained off -site basin is minor and will not affect the overall drainage during a
100-year storm event.
Also, the owner/contractor did not build the concrete pan from the parking areas down into the detention.
They propose to replace the concrete pan with 5'x10' pad of large cobbles (Class 9) at the discharge
points of the parking lot to prevent erosion along the bank of the detention pond. The large cobbles will
be installed with the landscaping, which should be completed by mid -March. Again, it is our opinion that
this is a minor change to the overall drainage during the 100-year event.
Please refer to the attached drawing illustrating the as -built elevations of the parking lot and finished floor
elevation. Also shown are the areas that changed as detailed above. Please contact me should you have
any questions regarding this Drainage Certification.
Sincerely,
TST, INC. CONSULTING ENGINEERS
riene .Ahado"wen, P.E.
SAS/
Enclosures
cc: Bo, Drahota Construction
Byron Collins, Paragon Point Partners
TST, INC. 748 Whalers Way - Building D
Fort Collins, CO 80525
Consulting Engineers (970) 226-0557
Metro (303) 595-9103
Fax(970) 226-0204
Q
Email info@tstinc.com
www.tstinccom
Willow Springs
*(6 bil
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 facilities 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
-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
NA
-permanent erosion control measures Na
(drop structures, riprap, etc..:.)
-tie-in to pipes, pans, curbs, etc....
-weir size (elevations, size, opening, etc...)
-available freeboard
-landscaping infringement on swales
3. Pi-oes
-size and -type NA
-:slopes (as -built and comparison to minimum
0.4% slope)
-pipe capacity calculations if slopes are
significantly altered
-invert elevations
-installation and backfill material
-cover
-encasement and clearance from other utility
lines close by
-joints
4. Concrete Pan Channels
-size NA
-slope
-super elevation
-cross-section
-thickness
-elevations
S� A'ft13t�I�D
I6-ffER
5. Inlets
-size and type NA
-size of opening (or name of standard used)
-grate elevation
-invert elevation
-box size
S. Cross vans
-sizes OK
-type
-grade
-elevation
-cross-sectional depth
-tie-in to curb and gutter
7. Culverts
-size NA
-type
-invert elevation
-headwalls
S. Underdrains
-size Iy Qt
-type
-cover
-backfill
-geotextiles
-cleanouts
NA
9. Curb cuts
-size
-tie in to swale, pipe, etc.... OK
B. Certification of Grade Elevations Adjacent to
Drainage Facilities:
-minimum opening elevations OK
-top of foundation elevations OK
-comparison to 100 year WSEL's OK
(Freeboard requirements and floodplain issues)
C. Certification of Erosion Control Measures:
1. Permanent Measures:
-Permanent vegetation (6" bare spots and weeds
under control ) �QhGQlP�11� II
-riprap will W Com�Cil tnhG �
-riprap bedding IGn(pinQ./ JJ
-drop sections —fj _ o0
-sediment basins/water quality ponds NA_
-netting mats/blankets NA
-mulching OA
2. Temnorary Measures:
-mulching Na
-inlet filter installation
-check bale dams
-seeding and temporary vegetation
-silt fence
D. Site Cleanup After Construction
-construction clean up V
-smoothing of ruts NR
-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:enclosedj
Gtrnd +H G q:*OtGhui Itite r.
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.
Fa
Signature and S
Engineer.
Istered Professional
TST, INC.
Consulting Engineers
CLIENT - I /� �(/�1/7JOB NO.
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PROJECT WIj[0W /Vr Lh Q7 1/111 C-L CALCULATIONSFOR 1/1 M/YI L(.U1G/ �1I 1w"I1
MADE BY DATE CHECKED BY_ DATE SHEET OF
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K.c.
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City of Pt. Collins, Colorado
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1. The City of Fort CONhs bformroto UNity erosion control inspxror must
he narifrod Or /east 24 hours pear to any canslackan on the Site
2 Al/ fep✓irod perimeter sift ISAMIng shot/ be bstuned pn'or to any sort
diefurbiog ocriviy (stxkppng, sldppa , gatebg, etc) Alf other fequbvY
erosion central meosures Shelf be jaeloate at the appro an ISE time in the
construction sSQYence as Indicated in he OpprOMC pra/ect Mheduh,
construction plans OnG, erosion control wood
J Pro -disturbance veyerof/on shell be profxfed one attuned whenever
passlae. Removal. Of disrurbame of VAishng vegefofion Shan be Fnmihe to
rhr area AQYired / immediate cWshKtbn Opllafidls, Ond /W the shortest
partkat pen'od of time.
s. An ease erpoeee dung .halt A)rurbbg ecri,+ry (f poing, g(Oeing, ufik'ty
iastonabOr,, elackpi6V, E2rq, ere.) Allolf be kept / a roughened condition
by rWng Or ehcing obng land caMOSOT until mach, vegNE't on, or Other
permanent erasion contra/ is Anslahee fro soh in ovens Outside 0OMPArct
street rights of ray shall rsmmn a Dose✓ by bad C'sfOahV Oc6vdy fa
move than thirty (M) days before afeaved hnobot or permanent ero5ran
coma (e.g. seed/ inch, bnesceping, etc.) is ,Mslonee, anhee orherwhe
ogaro.wd by the Slormrorer Malzol.
5. The propo(y shall be watered and mamtoinel at ON times airing
constuction actlobas so as to prevent woad-coueee erosion. AR land
ShOurovV averwMes shot/ be havroa ofey C}cantinuee when 41NIAR dust
yEpOche adjacent proprrth5 as determined by the City of Fort Col/ins
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6. AM tefnaarory (srruclurv/) eroson central meosuns shall be inipecfM One
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flnuee prl moxe or Mein infeMM function. As relolnM
safimMrs, (M16Coof MOM M p0✓ed rWe y surfaces. 400// be larnOMd
Ord asposee of in o morvrx orM location M as to court their release into
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shall be pro(ecred from soloolato tronsporr be sun a roughenlrV. woMing,
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be seeded orM mulched
R. Ci/y Ordmonce probWBs the tracking, dropping p ✓eposiling of soils of any
other motena/ onto CT, streets by o 1 any veMcb. My everoaent
deposited morerie/ shelf be throve immed'orey by the contactor.
9 Instal/ grow/ kiet Men, On 0# MMS
10. 5,11 fence shelf be Mnf, 7nvirofence ICOy' or oplaraved equal.
II. straw bah bamers we to be Nvb/hd Immadarey fo/bw hg the goading
12 Al/ areas drsfudIef by conslrvetmn she/be rood to Occaadmg Po the
AcAnsrope plan thoseITthose, o dNay in hurting ronsfrucfan, the pod is 10 be
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IS rho denott o she// be responsibh far mamfommy elf Sort contra
forilrhes, inching neMeRM areas. Sono a hearty state of vegetarian Ives
ban esroaished.
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