HomeMy WebLinkAboutSite Certifications - 08/08/2016Project Name: Foothills Mall Redevelopment (Partial As -built)
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Date: June 22, 2016
Building Permit Numbers: Block 9B - Permit B1500109
(Commercial or multi -family)
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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:
Note: This will be addressed at project completion.
A. Volume: NSA 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. NIA Detention basin topography was prepared by a professional land surveyor registered in the state
of Colorado.
2. NIA Both proposed and as -built contours are shown on the same plan sheet (dashed lines for
proposed and solid lines for as -built).
3. NIA 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.
q, N/A Stage -storage -discharge tables are provided on a separate document.
5. NIA 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/COCompliancePortal) 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
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Page 1
B. Water Quality and Quantity Detention Basin Grading: NIA 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. NIA 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. NIA 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. NIA 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 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 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. +/-.
2. Side Slopes: NIA 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. NIA The location of the spillway is indicated on the as -built plan.
b NIA The width of the spillway is indicated on the as -built plan.
C. NIA The elevation(s) of the spillway is shown on the as -built plan.
d. NIA A concrete ribbon defines the location and grade of the spillway.
e. NIA 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. NIA There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
12/15 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
Note: This will be addressed at project completion. General compliance in Block 9B area.
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. N/A 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
III. Storm Pipes (aka storm drains) - FCSCM Vol.1, Ch.6, Sec. 4
A. Storm Drain Pipe Capacity: 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. Note: Storm sewer is private: As-buiits will be sent to design enp
1. 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
7-ia , -e addressed at project completion.
equivalency (equal or greater) of the substituted size. Gencml c^mpi an_-e in Block 9B area.
2. 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. Note: As-builts will be sent to design
engineer for review.
3. The as -built invert elevations have been verified and are shown on the plan and profile sheets of
the approved construction plans. Note: Invert elevations are shown on attached sheet. Invert elevations will
be. shown on plan and profile sheets at project completion.
B. Storm Drain Pipe Installation Requirements: All pipes are installed in accordance with the
approved construction plans. Note: Storm sewer is private, backfill was observed and tested by - (continued below)
1. 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. All encasements and clearances as specified on the approved construction plans have been met.
3. 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.)
-eports sent - design engineer for review.
IV. Concrete Pans - FCSCM Vol.1, Ch.7, Sec.4.1.3.4
r. General compliance in Block 9B area.
A. Construction/Installation: N/A All concrete pans have been constructed in accordance with the
approved construction plans.
1, N/A 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 must justify 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. N/A 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. N/A 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: All storm drain inlets have been constructed in accordance with the
approved construction plans. vote: This will be addressed at project completion. Installation was observed
and tested by Ground Engineering. Reports sent to City for review
1. 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, provide the name and source of the detail with justification for equal or
better capacity.
2. The size of the inlet opening is consistent with the approved detail. (Check height and width.)
3. 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. 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.
S. The as -built size of the inlet box is as shown on the construction plans or an explanation or
justification is attached.
6. All inlet covers are stenciled or stamped with the following designation: NO DUMPING — DRAINS
TO POUDRE RIVER.
VI. Culverts - FCSCM Vol.2, Ch.9 - This will be addressed at project completion.
see attachment A for area where this document applies)
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 Note: Storm sewer is private. installation of sub -drains were observed by Ground Engineering.
Reports sent to City for review.
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. N/A The cover requirements per the construction plans are provided.
4. N/A 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. N/A The backfill materials for sub -drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6. N/A 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.)
Vill. Curb Cuts
will be done at project completion. General compliance in Block 9B area.
A. Construction: All curb cut openings are constructed in accordance with the approved construction
plans.
1. The size (width) of the curb cut opening is as shown on the approved construction plans.
2. 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
completion. General compliance in Block 9B area.
A. Construction/Installation: N/A All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1. N/A The size (width and length) of the culverts are as shown on the approved construction plans.
2. N/A 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. N/A The sidewalk culvert invert "in and out" elevations have been verified and are indicated on the
as -built plans.
4. N/A The sidewalk culvert opening is as shown on the approved construction plans or per the City's
detail.
5. N/A 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: N/A All common open spaces have been graded in accordance with the approved
construction plans.
1. N/A 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.
12/15 Page 6
2. N/A 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.1, Ch.7, Sec.4.4.4.3
Noce: 7-,is :•,il' Ir- :�cr �,ro;ec! completion. General compliance in Block 9B area.
A. Construction: N/A All riprap has been installed in the locations and sizes indicated on the approved
construction plans.
XII. Permanent Erosion Control Fabric - FCSCM Vol. 1, Ch.7
lc : Tni ill I -c--. compliance in Block 9B are
A. Construction: N/A All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1. N/A All fabric was installed per the details on the approved construction plans.
XIII. Post -Construction Site Cleanup - FCSCM Vol.3, Ch.7
in L c df
A. Construction: N/A All construction debris and obstructions of any kind have been removed from
drainage paths.
1. N/A All construction debris has been removed except in staging area(s).
2. N/A All ruts have been smoothed out in all construction areas.
3. N/A 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
Note: 7-is .Fill be a'.
A. N/A 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
No'c: T vli' oe gone Dice. ecmrJel
A. N/A 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.
12/15 Page 7
XVI. Certification and Erosion Control Measures
Ncto: T Nz n,� H Ne rr:, -mm-li :rcr-,, ;n EInc', `,R
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.
XVIL 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:
Q-p'� 0 R E�7sr
Name: Kenneth W. Curfman
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Email: kcurfman@flatironsinc.com 25620 i
Phone: 970-443-7001, ext. 184
Company: Flatirons, Inc. p' •.......g
FANE) 9
Address: 655 Fourth Avenue
Longmont, CO 80503 PE Stamp
Sign and date
City of
Fort Collins
r~� Utilities
12115 Page 8
Project Name: Foothills Mall Redevelopment (Partial As -built)
Date: June 22, 2016
Building Permit Numbers: Block 9B - Permit B1500109
(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:
\Iota_ TN^ z will be 2ddr sserl ,eject comrlotior..
A. Volume: NIA 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. NIA 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. NIA 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/COCompliancePortal) 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 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 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. +/-.
2. Side Slopes: NIA 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.).
N/A There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
12/15 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. NIA The orifice plate for the water quality outlet is installed with the correct hole size, number of
rows and columns of holes.
C. NIA 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. NIA 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. NIA 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
i . -I- _ sled, _ rol=ci completion. General compliance in Block 98 area.
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. N/A 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
III. Storm Pipes (aka storm drains) - FCSCM Vol.1, Ch.6, Sec. 4
A. Storm Drain Pipe Capacity: 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. Note: Storm sewer is private: As-builts will be sent to design engineer for reviev.'.
1. 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. Note: This
General is
2. 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. Note: As-builts will be sent to design
engineer for review.
3. The as -built invert elevations have been verified and are shown on the plan and profile sheets of
the approved construction plans. Note: Invert elevations are shown on attached sheet. Invert elevations will
be shown on plan and profile sheets at project completion.
B. Storm Drain Pipe Installation Requirements: All pipes are installed in accordance with the
approved construction plans. Note: Storm sewer is private, backfill was observed and tested by - (continued below)
1. 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. All encasements and clearances as specified on the approved construction plans have been met.
3. 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.)
Ground Engineering. Reports sent to City and design engineer for review.
IV. Concrete Pans - FCSCM Vol.1, Ch.7, Sec.4.1.3.4
^ completion. General comoliance in Block 9B area.
A. Construction/Installation: N/A All concrete pans have been constructed in accordance with the
approved construction plans.
1. N/A The concrete pans are the correct size/width as shown on the approved construction plans.
z N/A The longitudinal slopes of the pans are as shown on the approved construction plans. The
certification engineer must justify 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. N/A 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. N/A 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.)
S. N/A 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: All storm drain inlets have been constructed in accordance with the
approved construction plans. Note: This will be addressed at project completion. Installation was observed
and tested by Ground Engineerinq. Reports sent to City for review
1. 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, provide the name and source of the detail with justification for equal or
better capacity.
2. The size of the inlet opening is consistent with the approved detail. (Check height and width.)
3. 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. 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. The as -built size of the inlet box is as shown on the construction plans or an explanation or
justification is attached.
6. All inlet covers are stenciled or stamped with the following designation: NO DUMPING — DRAINS
TO POUDRE RIVER.
VI. Culverts - FCSCM Vol.2, Ch.9 - This will be addressed at project completion.
'sce attachment A for area where this document applies)
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 Note: Storm sewer is private. Installation of sub -drains were observed by Ground Engineering.
srn' -2 +y for review.
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.
12115 Page 5
3. N/A The cover requirements perthe construction plans are provided.
4. N/A 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. N/A The backfill materials for sub -drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6. N/A 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.)
Vill. Curb Cuts
A. Construction: All curb cut openings are constructed in accordance with the approved construction
plans.
1. The size (width) of the curb cut opening is as shown on the approved construction plans.
2. 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
N -i il; L - „ zroject completion. General compliance in Block 9B area.
A. Construction/installation: N/A All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1. N/A The size (width and length) of the culverts are as shown on the approved construction plans.
2. N/A 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. N/A The sidewalk culvert invert "in and out" elevations have been verified and are indicated on the
as -built plans.
4. N/A The sidewalk culvert opening is as shown on the approved construction plans or per the City's
detail.
S. N/A 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: N/A All common open spaces have been graded in accordance with the approved
construction plans.
1. N/A 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.
12/15 Page 6
2. N/A 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.1, Ch.7, Sec.4.4.4.3
Noto: T`_ +,III oor^ 7'. I, cj-ct .,rm; �7`1:o
A. Construction: N/A All riprap has been installed in the locations and sizes indicated on the approved
construction plans.
XII. Permanent Erosion Control Fabric - FCSCM Vol.1, Ch.7
NDIC flu- -il', h� o o rn �'.i; _ ^ �i ,,,rr• it �c _�
A. Construction: N/A All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1. N/A All fabric was installed per the details on the approved construction plans.
XIII. Post -Construction Site Cleanup - FCSCM Vol.3, Ch.7
A. Construction: N/A All construction debris and obstructions of any kind have been removed from
drainage paths.
1. N/A All construction debris has been removed except in staging area(s).
2 N/A All ruts have been smoothed out in all construction areas.
3. N/A 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. N/A 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
vote: -his wi',I :oo dC,o
A. N/A 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.
12/15 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.
XVIL 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:
DO RE
Name:
Kenneth W. Curfman
Email:
kcurfman@flatironsinc.com
62
Phone:
970-443-7001, ext. 184
�•
Company:
Flatirons, Inc.
.......... •' g
AFAND?
Address:
655 Fourth Avenue
Longmont, CO 80503
PE Stamp
Sign and date
Fort Collins
r� urm�
12115 Page 8
III.A: Storm Pipes
Pipe Slopes (As -built and comparison to Design)
Inlet # to Inlet #
Design Slope
As -built Slope
9A-1- 9A-2
0.32%
0.58%
9A-2 - 9A-3
0.32%
0.46%
9A-3 - 9A-4
0.32%
0.24%
9A-4 - 221
0.32%
0.11%
105A-105
1.04%
8.40%
105-106
N/A
0.62%
105-104
N/A
0.76%
221-220
0.32%
0.34%
Invert Elevations (As -built and comparison to Design)
Inlet #
Invert Location
Design Elevation
As -built Elevation
9A-1
SW
N/A
5015.73'
9A-2
SW & NE
N/A
5015.62'
9A-3
SW & NE
N/A
5015.53'
9A-4
SW & NE
N/A
5015.48'
221
W
NE
5015.38'
5015.38'
5015.42'
5015.43'
220
NW
E
5015.19'
5015.19'
5015.21'
5015.22'
105A
E
5014.60'
5014.95'
105
NE & SW
W
5013.26'
5014.51'
5013.31'
5014.26'
106
NE
SE
5014.51'
5014.51
5014.29'
5014.34'
104
NE & SW
NW
5012.15'
5012.40'
5012.25'
5012.30'
V.A: Storm Drain Inlets
Grate Elevations (As -built and comparison to Design)
Grate #
Design Elevation
As -built Elevation
9A-1
5019.80'
5019.69'
9A-2
5019.80'
5019.79'
9A-3
5019.80'
5019.72'
9A-4
5019.80,
5019.73'
220
5018.50'
5018.11'
105A
5018.60'
5018.50'
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AS -BUILT EXHIBIT -
BLOCK 9B
A PORTION OF FOOTHILLS REDEVELOPMENT,
LOCATED IN THE SOUTHWEST QUARTER OF SECTION 25,
TOWNSHIP 7 NORTH, RANGE 69 WEST OF THE 6TH P.M,
CITY OF FORT COLLINS, COUNTY OF LARIMER
STATE OF COLORADO
Notes
1. THIS EXHIBIT WAS PREPARED WITHOUT THE BENEFIT OF A CURRENT TTE COMMITMENT
AND D S NOT CONSTITUTE A TITLEEARCH SBT RATRCNS. INC. TO DETERMINE TILE
OR EA ENTS CF RECORD. THIS EXHIBIT DOES NOT PURPORT TO REFLECT ANY OF
THE F OWING WHICH MAY BE APPLICABLE TO TIE SUBJECT REAL ESTATE
EASEMENTS, OTHER THAN POSSIBLE EASEMENTS THAT WERE VISIBLE AT TIE TIME OF
MAKING THIS EXHIBIT; BUILDING SETBACK LINES; RESTRICTIVE COVENANTS; SUBDIV19ON
RESMICOCNS. ZONING OR OTHER LAND -USE REGULATIONS; AND ANY OTHER FACTS
THAT AM ACCURATE AND CURRENT TIME SEARCH MAY DISCLOSE.
2. ACCORDING TO COLORADO LAW, YOU MUST COMMENCE ANY LEGAL ACTION BASED UPON
ANY DEFECT IN THIS EXHIBIT TATHHN THREE YEARS AFTER YOU FIRST DISCOVER SUCH
DEFECT. IN NO EVENT MAY ANY ACTION BASED UPON ANY DEFECT IN THIS EXHIBIT BE
COMMENCED MORE MAN TEN YEARS FROM THE DATE OF ME CERTIFICATION SHOWN
HEREON.
3. THIS EXIIBIT WAS PREPARED FOR ME EXCLUSIVE USE OF HCBECK, LTD., NAMED IN
ME STATEMENT HEREON. SAID STATEMENT DOES NOT EXTEND TO ANY UNNAMED
PERSON WMOUT AN EXPRESS STATEMENT BY ME SURVEYOR NAMING SAID PERSON.
4. MIS EXHIBIT IS VALID ONLY IF PRINT HAS MIGNAL SEAL AND SCNATURE OF
SURVEYOR.
5. NO UTIIJTES ARE SHOWN HEREON. NO RESEARCH HAS BEEN DONE CONCERNING ME
EXISTENCE, SZE, DEPTH, CONDITION, CAPACITY OR LOCATION OF ANY UTILITY OR
MUNIOPAL/PUBUC SERVICE FACILITY. FOR INFORMATION REGARDING THESE UTILITIES,
PLEASE CONTACT ME APPROPRIATE AGENCIES ALL UNDERGROUND UTILITIES MUST BE
FIELD LOCATED BY ME APPROPRIATE AGENCY OR UTILITY COMPANY PRIOR TO ANY
EXCAVATION, PURSUANT TO C.R.S. SEC. 9-1.5-1p3.
S. ME DISTANCE MEASUREMENTS SHOWN HEREON ARE U.S. SURVEY FOOT,
7. BENCHMARK INFORMATION; ELEVATIONS BASED ON BENCHMARK D-322 FROM ME
APPROVED CONSTRUCTION PLANS, MTH A PUBUSHED ELEVATION OF 5p31.28 FEET
(NGVD39 UNADJUSTED), BEING AN NCS BENCHMARK DISK STAMPED OD322 RESET 197Y
LOCATED 5.4 KM (3.35 MI) SOUTH ALONG U.S. HIGHWAY 297 FROM ITS JUNCTION MTH
STATE HIGHWAY 14 IN FORT COWN5,1N ME NORTH END OF ME EAST CONCRETE
HEADWALL OF AN B-FOOT BY 24-FOOT BOX CULVERT, 6.1 METERS (20.0 FT) EAST OF
ME CENTERJNE OF ME NORTH BOUND LANES OF ME HIGHWAY. AND 1.7 METERS (5.6
FT) SOUTH OF ME NORM END OF ME HEADWALL ME MARK IS ABOVE LEVEL WITH
ME HIGHWAY.
B. DATES OF RELDWORN: SEPTEMBER - JUNE 2016.
9. BOUNDY DETERMINATION IS NOT A PART OF THIS EXHIBIT. THIS IS NOT A 'LAND
SURVEY PLAT' OR 'IMPROVEMENT SURVEY PLAY AND THIS EXHIBIT IS NOT INTENDED
FOR PJ POSES OF TRANSFER OF TITLE OR SUBDIVISIONS OF LAND AND THAT IT IS
NOT i0 BE RELIED UPON FOR ME ESTABUSHMENT OF A FENCE, BUILDING OR OTHER
10. ME S WAS AN ACTIVE CONSTRUCTION SEE AT ME TIME OF FIELDWORK.
11. ME H IZONTAL LOCATIONS AND LINEWORK SHOWN HEREON ARE MGM APPROVED
CONS CTION PLANS AND AUTOCAD FILES PROVIDED BY WENT AND DO NOT
12, ME PUpOSE OF MIS EXHIBIT IS TO SHOW AS -MEASURED SPOT ELEVATIONS AND
STORM WFR AS -BUILT DATA IN ME AREA OF BLOCK BB OVERLAID ONTO ME
PROPO CIVIL SEE RUM.
GRAPHIC SCALE
D 9T)
N loos - >ro n
$m
�r
t
min
I
urveyc es Statemenit DATE
JOHN B. YTM. A LAND SURVEYOR UCENSED IN ME STATE OF COLORADO. HEREBY BB-24-2016
LATE FOR NO ON BEHALF OF FIATRONS, INC., TO HCBECK, LTG., MAT THIS AS -BUILT 1DRAWN BY:
HINT WA PREPARED By ME OR UNDER MT RESPONSIBLE CHARGE; THAT SAID EXHIBIT B. OE
OALKE
4D ME R TVE ETEVATIONS SHOWN HEREON ARE ACCURATE TO ME BEST OF MY GE BY.
NEDG, INFORMATION AND BEUEF. JN
YN B. GU TON COLORADO P.L.S. 916406
UURMAN a CEO, FIATRONS. INC. SHEET 1 OF 1