HomeMy WebLinkAboutSite Certifications - 06/08/2016Project Name: Pateros Creek Ap QNM J — 4.�) L
Date: 5/24/16 //I (gl/)6
Building Permit Numbers:
(Commercial or multi -family)
Per the requirement in Fort Collins Stormwater Criteria Manual (FCSCM) Volume 1, Section 6.11, please fill in
all applicable items in this Certification Form for Commercial, Multi -Family and Overall Single Family sites.
NOTE: several items must be verified during construction. A copy of the approved grading plan must be
submitted with the as -built grading plan. (As -built elevations must be written in red next to the approved
elevations.)
• Use "Yes" for items completed as described.
• Use "N/A" for items that are not applicable to the site being certified.
• If any blanks are "No," attach an explanation referencing the item number below.
Attach an explanation or description of the as -built condition for any items listed or for anything not listed but
shown on the approved construction plans.
Provide an as -built redline or Mylar drawing with the following:
I. Water Quality and Quantity Detention Basin Certification - FCSCM Vol.2, Ch.10
For multiple detention basins on a site, provide the following for each basin separately:
A. Volume: N/A As -built topographic verification is attached at 1-foot (or less) contour intervals and
volume verification calculations for the water quality capture volume and the 100-year detention storage
volume.
1. N/A Detention basin topography was prepared by a professional land surveyor registered in the state.
of Colorado.
2. N/A Both proposed and as -built contours are shown on the same plan sheet (dashed lines for
proposed and solid lines for as -built).
3. N/A All critical spot elevations as shown on the approved construction plans have been verified and
the as -built elevations are shown on the plan sheet.
4. N/A Stage -storage -discharge tables are provided on a separate document.
5. N/A Verification that designed drain time is in compliance with Colorado Revised Statute § 37-92-
602(8) is attached and has been uploaded to the Statewide Compliance Portal
(tinvurl.com/COComaliancePortal) for approval. Uploaded documents must include:
a. The cover sheet from the approved drainage report
b. The stamped certification page from the approved drainage report
c. As -built topographic survey
d. Stamped certification page from the Overall Site & Drainage Certification
e. PDF output from the Stormwater Detention and Infiltration Design Data Speadsheet
12/15
Page 1
B. Water Quality and Quantity Detention Basin Grading: N/A Attached is as -built verification that there is
a minimum 2% positive fall into the concrete trickle pans or flow-line(s) from all areas in the bottom of
the detention pond. If there is a "soft pan" in the flow -line, all areas still must meet the minimum 2%
grade requirement.
1. Low Flow: Choose one of the following detention basin low flow options as applicable:
a. N/A Turf swale for low flow path in detention basin.
There is a minimum 2% grade in the flow-line(s) of the detention basin. The flattest as -built grade
is
b. N/A Concrete pan for low flow in detention basin.
There is a concrete pan installed that meets the grades as shown on the approved construction
plans. (Show as -built spot elevations.)
C. N/A Soft pan for low flow in detention basin.
• Verify and document the soft pan material gradation, trench width and depth -to be verified
during construction by engineer. Picture documentation is preferred or engineer's statement of
visual inspection and compliance. (Choose one below.)
o N/A There is a soft pan with an underdrain installed that meets the design on the approved
construction plans. (Show the underdrain grades, bedding material, geotextile, spot elevations,
bends, cleanouts, etc.)
o N/A There is soft pan installed without an underdrain but there is a type A or B soil. The soil
type must be documented by supplying verification from a registered professional geotechnical
engineer.
NOTE: Spot elevations are to be within 0.2 ft. +/-.
12n5
2. Side Slopes: N/A The as -built side slopes of the detention basin have been calculated and are shown.
Indicate the side slope with an arrow and a numerical value (e.g., 6.25:1). The maximum slope allowed
is 4:1. Small areas of 3:1 may be acceptable, but slopes steeper than 3:1 must be stabilized or re-
graded. Provide documentation if a variance was granted for steeper slopes during the design process.
3. Spillway Certification: The following items must be field verified:
a. N/A The location of the spillway is indicated on the as -built plan.
b. N/A The width of the spillway is indicated on the as -built plan.
C. N/A The elevation(s) of the spillway is shown on the as -built plan.
d. N/A A concrete ribbon defines the location and grade of the spillway.
e. N/A There is downstream scour protection in the spillway as per the construction plans. Indicate
type: (riprap size " D50" gradation and bedding type, geotextile, buried
riprap with inches of bury, etc.).
f. N/A There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
Page 2
4.Outlet Structure Certification
a. N/A The orifice plate for the approved release rate is installed with the correct size and location of
the orifice.
b. N/A The orifice plate for the water quality outlet is installed with the correct hole size, number of
rows and columns of holes.
C. N/A The bottom hole on both the water quality and quantity outlets are at the bottom of the plate
so no water ponds in front of the plate.
d. N/A The well screen is the correct material and is installed as shown on the construction plans.
e. N/A 100-year overflow grate elevation is . (Elev. A on detail D-46)
f. N/A The top elevation of the water quality capture volume is (Elev. B on detail
D-46)
g, N/A Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the
top and bolted at the bottom.
h. N/A The bottom of the outlet box has no obstructions or misalignments that will cause it to retain
runoff water and is sloped at 2% towards outlet.
II. Channels/Swales - FCSCM Vol.1, Ch.7, Sect.3&4
A. Capacity: N/A The as -built capacity of all the major channels and swales has been verified. They meet
or exceed capacity requirements shown in the approved drainage study for this project.
1. NIA All swales are located within the drainage easements as shown on the construction plans.
2. N/A Longitudinal slopes and side -slopes (cross -sections) have been verified. Design criteria requires
longitudinal slopes of 2% min. (on vegetated swales) and side -slopes no steeper than 4:1. If these
criteria are not met, the certification engineer will write a justification and propose mitigation for each
instance or have the issues corrected. If variances to these criteria have previously been approved and
are shown on the construction plans, no justification is needed.
3. N/A As -built spot elevations on channels/swales are shown that correspond to spot elevations
shown on the approved construction plans.
4. N/A All permanent erosion control measures are installed as shown on the approved construction
plans (e.g., drop structures, riprap, TRMs, etc.). (Include pictures and verification of the materials used
as part of this verification.)
5. N/A All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the
system. (Pictures at tie-in points suggested.)
6. N/A The minimum freeboard is provided for all channels and swales as shown on the approved
construction plans or as identified in the approved drainage study. (Show the freeboard provided on
the cross -sections as on the construction plan set or attached as separate documentation.)
7. N/A The low flow portion of all channels or swales is clear of obstructions. (No landscaping, trees,
shrubs, sod, etc. infringe on the low flow portion of channels or swales.)
12/15 Page 3
Ill. Storm Pipes (aka storm drains) - FCSCM Vol.1, Ch.6, Sec. 4
A. Storm Drain Pipe Capacity: Yes The as -built capacity of all pipes installed on this project has been
verified and meets or exceeds the capacity requirements shown in the approved drainage study for this
project.
1. Yes All storm drain pipe sizes and materials have been verified and are in conformance with the
approved construction plans. (Indicate on the plan and profile sheets that they have been verified.)
Material and size substitutions must be approved prior to installation. If a pipe size or material was
changed during construction, the certification engineer must attach the approval documents or supply
them with this certification. Approval documents must include a calculation documenting the capacity
equivalency (equal or greater) of the substituted size.
2. Yes The longitudinal slope of the pipe is as shown on the approved construction plans. The
acceptable minimum slope is 0.4%. All slopes flatter than the designed slope on the construction plans
must be justified with capacity calculations on an attached sheet.
3. Yes The as -built invert elevations have been verified and are shown on the plan and profile sheets of
the approved construction plans. Please see Attachment 1,
Storm Sewer As -Built Drawing
B. Storm Drain Pipe Installation Requirements: Yes All pipes are installed in accordance with the
approved construction plans.
1. Yes The minimum cover requirements for all pipes have been met as shown on the approved
construction plans. These will be called out in critical locations.
2. Yes All encasements and clearances as specified on the approved construction plans have been met.
3. NSA Any specific joint types or construction methods specified on the approved construction plans
have been met. (List on a separate sheet and attach to this certification.)
IV. Concrete Pans - FCSCM Vol.1, Ch.7, Sec.4.1.3.4
A. Construction/Installation: NIA All concrete pans have been constructed in accordance with the
approved construction plans.
1. NIA The concrete pans are the correct size/width as shown on the approved construction plans.
2. N/A The longitudinal slopes of the pans are as shown on the approved construction plans. The
certification engineer mustjustify or mitigate longitudinal slopes less than the minimum of 0.4% unless
a flatter slope was approved and is shown on the approved construction plans. Provide mitigation or
justification by separate document.
3. NIA The cross-section of the pan is as shown on the construction plans. (Specifically, the pan cross-
section is "V" shaped and meets the side slope shown on the detail.)
4. NIA The concrete pans are a minimum of 6 inches thick without reinforcement and a minimum of 4
inches thick with a minimum of 6X6-W14xW14 reinforcement per detail D20B and D20C. (Provide
documentation of the reinforcement used if different than shown on the details or on the approved
construction plans.)
5. NIA The spot elevations shown on the concrete pan(s) have been verified and are shown on the as -
built drawings.
12/15 Page 4
V.Storm Drain Inlets - FCSCM Vol.1, Ch.6, Sec. 3
A. Construction/Installation: Yes All storm drain inlets have been constructed in accordance with the
approved construction plans.
1. Yes The size and type of inlets are consistent with the inlets shown on the approved construction
plan. Indicate by writing "Verified" on each inlet on the plan sheet or list on a separate document the
inlet number(s), type and size (length). If the inlet installed is other than the one on the approved
construction plan detail sheet, p n for eaual
better capacity.
Please see Attachment 1, Storm Sewer As -Built Drawing
2. Yes The size of the inlet opening is consistent with the approved detail. (Check height and width.)
3. N/A The elevation of the grate (if applicable) is at the elevation shown on the street profile or as
indicated by a spot elevation on the construction plans.
4. Yes The as -built invert elevations of all pipes entering and leaving the inlet are shown on the plan
and profile sheets within construction tolerance of 0.2 feet. If substantially different, provide
justification and capacity calculations to show the capacity is not affected or propose mitigation.
5. Yes The as -built size of the inlet box is as shown on the construction plans or an explanation or
justification is attached.
6. Yes All inlet covers are stenciled or stamped with the following designation: NO DUMPING — DRAINS
TO POUDRE RIVER.
VI. Culverts - FCSCM Vol.2, Ch.9
A. Construction/Installation: N/A All culverts have been constructed and/or installed in accordance with
the approved construction plans.
1. N/A All culvert sizes have been verified as indicated on the as -built construction plans as correct.
2. N/A The culvert material type for all culverts installed is as on the approved construction plans and is
indicated on the as -built plans.
3. N/A The as -built invert "in and out' elevations have been verified and are indicated on the as -built
construction plans.
4. N/A The culvert headwalls or wing walls have been installed as shown on the approved construction
plans. Headwalls or wing walls may be needed in the as -built conditions onsite if the slopes adjacent to
the culvert are greater than 4:1. Please note areas needing stabilization in the certification narrative.
An alternative to consider is a turf reinforcement mat (TRM).
VII. Sub -Drains
A. Construction/Installation: N/A All sub -drains shown on the construction plans have been installed in
accordance with those plans. Sub -drains installed with the sanitary sewer are to be verified on the
sanitary sewer plan and profile sheets of the construction plans. (NOTE: Indicate any sub -drains installed
after the plans were approved on the as -built plans.)
1. N/A The size of the sub -drains are as approved on the construction plans and are indicated on the as -
built plans.
2. N/A The type of sub -drain, in particular the perforated and non -perforated sections of the drain, are
as indicated on the approved construction plans.
12/15 Page 5
3. NSA The cover requirements per the construction plans are provided.
4. NIA The cleanouts have been installed at the locations shown on the construction plans and are
accessible for cleaning. (Cleanouts can be buried a maximum of 6 inches deep with their locations
marked.)
5. NSA The backfill materials for sub -drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6. NSA The geo-textile liner completely wraps the sub -drain and the permeable backfill material unless
shown otherwise on the approved construction plans. (Sub -drain pipe wrapped in a sock filter material
is accepted only if approved prior to installation.)
Vlll. Curb Cuts
A. Construction: Yes All curb cut openings are constructed in accordance with the approved construction
plans.
1. Yes The size (width) of the curb cut opening is as shown on the approved construction plans.
Z. Yes The curb cut openings tie into a downstream swale, pipe, or other appurtenances with a smooth
transition and there no obstructions such as riprap or sod impeding the flow downstream of the curb
cut.
IX. Sidewalk Culverts & Chases
A. Construction/Installation: Yes All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1. Yes The size (width and length) of the culverts are as shown on the approved construction plans.
z. Yes The cover plate is a minimum 5/8-inch galvanized plate bolted to a galvanized angle iron per the
detail shown on the approved construction plans or per the City's detail.
3. The sidewalk culvert invert "in and out" elevations have been verified and are indicated on the
as -built plans.
4. Yes The sidewalk culvert opening is as shown on the approved construction plans or per the City's
detail.
5. Yes There is a smooth transition both on the inlet and outlet ends of the sidewalk culvert with no
obstructions such as riprap or sod impeding the flow into or out of the sidewalk culvert.
X. Site Grading
A. Construction: Yes All common open spaces have been graded in accordance with the approved
construction plans.
1. Yes The grading on all common open spaces bordering private lots has been verified as correct and
the as -built rear lot corner elevations have been shown on the as -built plans.
Please see Attachment 2,
Grading As -Built Drawing
12/15 Page 6
2. Yes The as -built contours for "overlot grading" are shown on the as -built construction plans for all
common open spaces, tracts, outlots, etc. If not in compliance, please attach a narrative describing the
situation for noncompliance and when it may be corrected. An escrow for overlot grading may be
required. (NOTE: Residential Lot Grading Certification is a separate process from this Overall Site
Certification. It is understood that residential lots will be brought to final grade once the foundation is
backfilled so they may be lower than the plan shows at this Overall Site Certification stage.)
3. N/A All turf reinforcement mats (TRMs) have been installed as shown on the approved construction
plans and the slopes are stabilized.
XI. Riprap - FCSCM Vol.l, Ch.7, Sec.4.4.4.3
A. Construction: Yes All riprap has been installed in the locations and sizes indicated on the approved
construction plans.
XII. Permanent Erosion Control Fabric - FCSCM Vol.l, Ch.7
A. Construction: NSA All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1. NSA All fabric was installed per the details on the approved construction plans.
XIII. Post -Construction Site Cleanup - FCSCM Vol.3, Ch.7
A. Construction: Yes All construction debris and obstructions of any kind have been removed from
drainage paths.
1. Yes All construction debris has been removed except in staging area(s).
2. Yes All ruts have been smoothed out in all construction areas.
3, Yes All areas needing reseeding have been identified and future stabilization goals have been
coordinated with the Erosion Control Inspector and in accordance with FCSCM Vol.2 Chapter 12. Note
the area needing stabilization in the narrative.
XIV. Certification of Other Permanent BMPs - FCSCM Vol.2, Ch.8, Sec.2 & FCSCM Vol.2, Ch.12
A. NIA The construction of channel drop structures is in accordance with the approved plan both in
location, horizontal dimensions and cross-section.
XV. Certification of LID and Water Quality Facilities - FCSCM Vol.3, Ch.4
A. Yes Attached are the During Construction Inspection Checklist for Low Impact Development (LID) and
other items to be verified during construction, along with pictures and other required documentation.
12M5 Page 7
XVI. Certification and Erosion Control Measures
A. All temporary erosion control measures shall be removed upon stabilization. If at the time of preparing
this certification there are any erosion control measures still remaining on the site, please note them in
the narrative and verify that they need to remain at this time. If in doubt as to the need for any control
measure, please consult with the Erosion Control Inspector at 970-221-6700.
XVII. Statement of Compliance
A. This certification is signed and stamped. By signing this form, the engineer(s) attests that he/she has
visited and observed the site, and to the best of his/her knowledge, the as -built conditions of the drainage
facilities are as described in the above form and in the enclosed as -built plans.
B. Failure to properly disclose all known information could result in the rejection of this certification and
prevent the release of any and all Stormwater Utility permit holds on Building Permits and/or Certificates
of Occupancy within this development.
XVIII. Signature and Stamp by a Colorado -Registered Professional Engineer
Engineer's contact information:
Name: AAvze�f C4Av-
Email: AAVZo l nio2r*+e¢�e,lt��lE2tz�dt,�-
Phone: R-To— G69- S 01
Company: NORT»r=e#J EnIalNE'�-e,"
Address: 3 i r4 - 14eu9 ra-s ST. Sv rri= i c
t-oT Go eoE;Z�
. PE Stamp
Sign and date
City of
Fort Collins
UtlBUes
12/15 Page 8
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ATTACHMENT 1
Storm Sewer As -Built Drawing
NORTHERN
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NOTES: E
I THE SUE FALSE AND LOCATION OF ML KNOWN UNDUMUFFAUND UTILITIES REAFFIFEUXISAFTE MIEN SHOWN ON THESE DRAWINGS IT SHALL BE THE
OF THE CONTRACTOR TO VERIFY THE EXISTENCE OF ALL GROUND DTUTEsiN $f
THE AREA OF THE WATER BEFORE CONMENCING NEW CONSTRUCTION E
STORM DRAIN 1 CONTRACTOR SHALL BE RECTUNTARL F FOR 10I ALL UNDERGROUND UIIIIIEs
AND SHALL BE xE0Wx0iBlE FOR all urvxrvOwry ux0[xcvoux0 UTILITIES.
2 MAINTAIN 10 HORIZONTAL AND HE VERTICAL MINJARUM iION BEMEEN ALL F
SANITARY SEWER MANS, WATER MOWS, AND SERVIDIF IS N B
3 PIPE LENGTHS RE CALCULATED FEWER FILE CENTER OF MBNHOLES AND INLET BOA &E
e
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WITHJN�TER
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City of Fort Collins. COT
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APPROVED
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CHECKtt ,y �1-ryr/p
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ATTACHMENT 2
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NOTES
TAPoROXIMATEINHEN:OCREARIE°FALL T�s jo��TM":� IETHEIES ARE
RESPONSIBILITY OF THE CMTRwc ExiSTAMAX OF THE AGENT �ENTEKENLL
OM CONSC1TRuc*ON*THE COME SHARE LOCATING
ALL UNDERGROUND UN LITTER AND BULL PE RESPONSIBLE FOR FOR ALL
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' UTILIATYTrnTHEM
EN.s OTHER EAAEMIGHswAAD OTHR SURVEY WORWTON.
S MR MINE GAVE #12-Ml DATED MARSH HMAE MEN MNS PLAN ECT
MOOED FROM THE SPECIAL FLO'oo�DAREAEAs q�ON
ALL RAMS LOCATED CHILD THE FUTURE FLOOwR.v SEMLLR CONSTRUCTED IN
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E LOGS I ME 2 ME LOCATED IN THE MET MMEN THE FLOWMAY IS Eo OOIXYAV CASH H ONLY BE
S REDEEM OSDEVELOPEO PROPOSED V.ETLWD FRRER.Y TO UNGULATE FIRM. MCROGRADxG
TO SE COMPLETED IN THE FIELD.1 INPUT FROM CEDAR CREEK.
SEE EMPIRE
TISECTION I. 1 OF THE Ep RB USE CODE FOR ALLOWLE A4YGT : HIN THE
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WEE RTO FLOSERTUABN EWNTSRDFFEBTFOR AGENT CRAL INFORMATION AND
REQU
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dATMM•NMME THE WWY EIEVwTXM6 RESIPED
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NOTES:
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R F <
UNDERGROUND UPLITEX IN THE ALL
LINEN
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ATTACHMENT 3
Water Quality Forebay Spillway As -Built Drawing
NORTHERN
ENGINEERING
Water Quality Pond (Forebay) Volume Calculations
Project: 687-001
By: ATC
Original Date: 8.1.13
As -Built Calculation Date: 5.24.16
Note: Volume calculations utilize Conic Method
Design Volume = 0.11 Ac-Ft at WSEL 4970.54
Pond Stage
Depth
F
Surface Area
of Contour
SF
Incremental
Volume
CF
Total Volume
CF
Total Volume
AF
4969
0
2990
4970
1.00
4259
3602
3602
0.083
4970.77
0.77
5302
4083
8342
0.191
4971
1.00
5614
4916
18518
10.196
*Water present, utilized design contour at elev. 4969
**Interpolated Water Quality WSEL - As -Built Condition Provides Excess of 0.08 Ac-Ft.
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D:\Projects\687-001\Archsurv\Received\NE Survey\2016-06-06_Updated pond topo\687-005 AB Pond Weir 6-6-16.dwg, 6/6/2016 2:14:44 PM, DWG To PDf.pc3