HomeMy WebLinkAboutSite Certifications - 03/27/2017
Mr. Dan Mogen
City of Fort Collins Stormwater Utility
700 Wood St.
Fort Collins, CO
February 21, 2017
RE: Drainage Certification for The Music District
Dear Mr. Mogen,
This drainage certification letter is provided to verify as-constructed conditions for The Music District.
Northern Engineering completed survey work October 21, 2016 to verify general compliance with the
Final Utility Plans for The Music District, dated 12/15 and 3/15 including revised drawings dated 8/15,
11/15, and 8/16 by Northern Engineering.
Included in this drainage certification submittal are the following:
Attachment 1 - City of Fort Collins Overall Site and Drainage Certification Form.
Attachment 2 - City of Fort Collins During Construction Inspection Checklist and photographs provided
by contractor.
Attachment 3 - As-constructed rain garden calculations.
Attachment 4 - As-constructed record drawings for Grading and Storm Drain Plan and Profile Sheets.
Based on the calculations shown in Attachment 3, the as-built water quality pond volumes are in Table
1. The as-built rain gardens will provide water quality treatment within the site.
Table 1: Pond Record Volumes
Pond
Design Water
Quality Vol. (ft3)
As-built Water
Quality Vol. (ft3)
North Rain Garden 107 218
Middle Rain Garden 288 288
South Rain Garden 250 848
We have concluded, based on the attached information and personal site inspection, that the drainage
features for the project site have been constructed in substantial compliance with the above referenced
Final Utility Plans, with the following exceptions:
Item I.B.1.c: According to the contractor, a drywell and underdrain system was installed for the
northern and middle rain gardens per approved drawings dated 8/16. The most southern rain
garden was constructed without a drywell and underdrain system per the approved plans dated
11/15. Northern Engineering did not observe construction and was unable to verify the slope of
the bedding material and underdrains.
Item VII.A: According to the contractor, a drywell and underdrain system was installed for the
northern and middle rain gardens per approved drawings dated 8/16. The southern rain garden
was constructed without a drywell and underdrain system per the approved plans dated 11/15.
Item VII.A.1: Northern Engineering did not observe construction. Northern Engineering was
unable to verify the size of the underdrains in the north and middle rain gardens.
Item VII.A.3: Northern Engineering did not observe construction. Northern Engineering was
unable to verify the depth of the underdrains in the north and middle rain gardens.
Item X: The replacement of the curbed landscaping areas along Dalzell Alley was not designed
by Northern Engineering. Area between the transformer and the back of curb was filled to allow
the curb to impede the drainage from the landscaping bed. The Owner approved of the limited
backfill near the transformer. Therefore, the drainage within the curbed landscaping beds along
Dalzell Alley will not be certified by Northern Engineering
Please feel free to contact me with any questions you may have.
Thank you,
NORTHERN ENGINEERING
Frederick S. Wegert, PE
Project Engineer
/15 Page 1
OVERALL SITE and DRAINAGE CERTIFICATION
Commercial, Multi-Family and Subdivision Certification Form and Checklist
Project Name:
Date:
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.)
x Use “Yes” for items completed as described.
x Use “N/A” for items that are not applicable to the site being certified.
x 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: 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. Detention basin topography was prepared by a professional land surveyor registered in the state
of Colorado.
2. Both proposed and as-built contours are shown on the same plan sheet (dashed lines for
proposed and solid lines for as-built).
3. 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. Stage-storage-discharge tables are provided on a separate document.
5. 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
(tinyurl.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
North Rain Garden
Music District - 619 S. College
2/21/2017
B1506034, B1601215, B1602379
Yes
Yes
Yes
Yes
Yes
N/A
/15 Page 2
B.Water Quality and Quantity Detention Basin Grading: 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. 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. 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. Soft pan for low flow in detention basin.
x 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: 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. The location of the spillway is indicated on the as-built plan.
b. The width of the spillway is indicated on the as-built plan.
c. The elevation(s) of the spillway is shown on the as-built plan.
d. A concrete ribbon defines the location and grade of the spillway.
e. 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. There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
Yes
N/A
N/A
Yes
Yes
N/A
Yes
Yes
Yes
Yes
N/A
Yes
Yes
3.4%
concrete chase
/15 Page 3
4.Outlet Structure Certification
a. The orifice plate for the approved release rate is installed with the correct size and location of
the orifice.
b. The orifice plate for the water quality outlet is installed with the correct hole size, number of
rows and columns of holes.
c. 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. The well screen is the correct material and is installed as shown on the construction plans.
e. 100-year overflow grate elevation is . (Elev. A on detail D-46)
f. The top elevation of the water quality capture volume is . (Elev. B on detail
D-46)
g. Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the
top and bolted at the bottom.
h. 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: 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. All swales are located within the drainage easements as shown on the construction plans.
2. 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. As-built spot elevations on channels/swales are shown that correspond to spot elevations
shown on the approved construction plans.
4. 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. All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the
system. (Pictures at tie-in points suggested.)
6. 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. 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.)
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
N/A
Yes
Yes
/15 Page 4
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.
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.
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.
3. The as-built invert elevations have been verified and are shown on the plan and profile sheets of
the approved construction plans.
B.Storm Drain Pipe Installation Requirements: All pipes are installed in accordance with the
approved construction plans.
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.)
IV. Concrete Pans - FCSCM Vol.1, Ch.7, Sec.4.1.3.4
A.Construction/Installation: All concrete pans have been constructed in accordance with the
approved construction plans.
1. The concrete pans are the correct size/width as shown on the approved construction plans.
2. 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. 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. 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. The spot elevations shown on the concrete pan(s) have been verified and are shown on the as-
built drawings.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
Yes
Yes
/15 Page 5
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.
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
A.Construction/Installation: All culverts have been constructed and/or installed in accordance with
the approved construction plans.
1. All culvert sizes have been verified as indicated on the as-built construction plans as correct.
2. The culvert material type for all culverts installed is as on the approved construction plans and is
indicated on the as-built plans.
3. The as-built invert “in and out” elevations have been verified and are indicated on the as-built
construction plans.
4. 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: 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. The size of the sub-drains are as approved on the construction plans and are indicated on the as-
built plans.
2. The type of sub-drain, in particular the perforated and non-perforated sections of the drain, are
as indicated on the approved construction plans.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
N/A
Yes
No
Yes
/15 Page 6
3. The cover requirements per the construction plans are provided.
4. 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. The backfill materials for sub-drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6. 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.)
VIII. 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
A.Construction/Installation: All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1. The size (width and length) of the culverts are as shown on the approved construction plans.
2. 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. The sidewalk culvert opening is as shown on the approved construction plans or per the City’s
detail.
5. 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: All common open spaces have been graded in accordance with the approved
construction plans.
1. 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.
No
N/A
Yes
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
/15 Page 7
2. 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. 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
A.Construction: 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
A.Construction: All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1. All fabric was installed per the details on the approved construction plans.
XIII. Post-Construction Site Cleanup - FCSCM Vol.3, Ch.7
A.Construction: All construction debris and obstructions of any kind have been removed from
drainage paths.
1. All construction debris has been removed except in staging area(s).
2. All ruts have been smoothed out in all construction areas.
3. 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. 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. 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.
N/A
Yes
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
N/A
Project:
Date:
Outlet Elevation:4995.61 107 ft3
Grate Elevation:4995.02 118 ft3
Crest of Pond Elev.:4996.06 4995.6
Maximum
Elevation
Minimum
Elevation cu. ft.acre ft cu. ft.acre ft
4995.0 N/A 0.0 0 0.0 0.00 0.0 0.00
4995.2 4995.0 33.3 0.1 2.3 0.00 2.3 0.00
4996.0 4995.2 481.5 0.8 216.2 0.00 218.5 0.01
North Rain Garden Stage Storage Curve
Contour Contour
Surface Area
(ft2)
Depth
Incremental Volume Cummalitive Volume
Existing Pond Stage Storage Curve
1052-002
Fort Collins, Colorado
F. Wegert
North Rain Garden
Elev at Design Volume:
Music District - 619 S. College Ave.
2/21/2017
Pond Outlet and Volume Data
Design Volume:
Volume at Outlet:
Project Number:
Project Location:
Calculations By:
Pond No.:
2/21/2017 3:29 PM D:\Projects\1052-002\Drainage\Detention\
1052-002_Stage-Storage_North.xlsx\Pond
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/15 Page 1
OVERALL SITE and DRAINAGE CERTIFICATION
Commercial, Multi-Family and Subdivision Certification Form and Checklist
Project Name:
Date:
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.)
x Use “Yes” for items completed as described.
x Use “N/A” for items that are not applicable to the site being certified.
x 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: 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. Detention basin topography was prepared by a professional land surveyor registered in the state
of Colorado.
2. Both proposed and as-built contours are shown on the same plan sheet (dashed lines for
proposed and solid lines for as-built).
3. 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. Stage-storage-discharge tables are provided on a separate document.
5. 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
(tinyurl.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
Middle Rain Garden
Music District - 633/639 S. College
2/21/2017
B1501004
Yes
Yes
Yes
Yes
Yes
N/A
/15 Page 2
B.Water Quality and Quantity Detention Basin Grading: 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. 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. 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. Soft pan for low flow in detention basin.
x 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: 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. The location of the spillway is indicated on the as-built plan.
b. The width of the spillway is indicated on the as-built plan.
c. The elevation(s) of the spillway is shown on the as-built plan.
d. A concrete ribbon defines the location and grade of the spillway.
e. 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. There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
Yes
N/A
N/A
Yes
Yes
N/A
Yes
Yes
Yes
Yes
N/A
Yes
Yes
2.0%
concrete chase
/15 Page 3
4.Outlet Structure Certification
a. The orifice plate for the approved release rate is installed with the correct size and location of
the orifice.
b. The orifice plate for the water quality outlet is installed with the correct hole size, number of
rows and columns of holes.
c. 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. The well screen is the correct material and is installed as shown on the construction plans.
e. 100-year overflow grate elevation is . (Elev. A on detail D-46)
f. The top elevation of the water quality capture volume is . (Elev. B on detail
D-46)
g. Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the
top and bolted at the bottom.
h. 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: 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. All swales are located within the drainage easements as shown on the construction plans.
2. 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. As-built spot elevations on channels/swales are shown that correspond to spot elevations
shown on the approved construction plans.
4. 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. All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the
system. (Pictures at tie-in points suggested.)
6. 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. 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.)
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
N/A
Yes
Yes
/15 Page 4
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.
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.
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.
3. The as-built invert elevations have been verified and are shown on the plan and profile sheets of
the approved construction plans.
B.Storm Drain Pipe Installation Requirements: All pipes are installed in accordance with the
approved construction plans.
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.)
IV. Concrete Pans - FCSCM Vol.1, Ch.7, Sec.4.1.3.4
A.Construction/Installation: All concrete pans have been constructed in accordance with the
approved construction plans.
1. The concrete pans are the correct size/width as shown on the approved construction plans.
2. 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. 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. 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. The spot elevations shown on the concrete pan(s) have been verified and are shown on the as-
built drawings.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
Yes
Yes
/15 Page 5
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.
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
A.Construction/Installation: All culverts have been constructed and/or installed in accordance with
the approved construction plans.
1. All culvert sizes have been verified as indicated on the as-built construction plans as correct.
2. The culvert material type for all culverts installed is as on the approved construction plans and is
indicated on the as-built plans.
3. The as-built invert “in and out” elevations have been verified and are indicated on the as-built
construction plans.
4. 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: 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. The size of the sub-drains are as approved on the construction plans and are indicated on the as-
built plans.
2. The type of sub-drain, in particular the perforated and non-perforated sections of the drain, are
as indicated on the approved construction plans.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
N/A
Yes
No
Yes
/15 Page 6
3. The cover requirements per the construction plans are provided.
4. 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. The backfill materials for sub-drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6. 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.)
VIII. 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
A.Construction/Installation: All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1. The size (width and length) of the culverts are as shown on the approved construction plans.
2. 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. The sidewalk culvert opening is as shown on the approved construction plans or per the City’s
detail.
5. 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: All common open spaces have been graded in accordance with the approved
construction plans.
1. 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.
No
N/A
Yes
N/A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
/15 Page 7
2. 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. 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
A.Construction: 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
A.Construction: All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1. All fabric was installed per the details on the approved construction plans.
XIII. Post-Construction Site Cleanup - FCSCM Vol.3, Ch.7
A.Construction: All construction debris and obstructions of any kind have been removed from
drainage paths.
1. All construction debris has been removed except in staging area(s).
2. All ruts have been smoothed out in all construction areas.
3. 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. 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. 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.
N/A
Yes
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
N/A
Project:
Date:
Outlet Elevation:4995.77 288 ft3
Grate Elevation:4995.20 198 ft3
Crest of Pond Elev.:4996.25 4995.9
Maximum
Elevation
Minimum
Elevation cu. ft.acre ft cu. ft.acre ft
4995.2 N/A 0.0 0 0.0 0.00 0.0 0.00
4995.5 4995.2 358.8 0.3 53.8 0.00 53.8 0.00
4996.0 4995.5 708.5 0.5 266.8 0.01 320.6 0.01
Volume at Outlet:
Project Number:
Project Location:
Calculations By:
Pond No.:
Middle Rain Garden Stage Storage Curve
Contour Contour
Surface Area
(ft2)
Depth
Incremental Volume Cummalitive Volume
Existing Pond Stage Storage Curve
1052-002
Fort Collins, Colorado
F. Wegert
North Rain Garden
Elev at Design Volume:
Music District-633/639 S. College Ave.
2/21/2017
Pond Outlet and Volume Data
Design Volume:
2/21/2017 3:29 PM D:\Projects\1052-002\Drainage\Detention\
1052-002_Stage-Storage_Middle.xlsx\Pond
/15 Page 1
OVERALL SITE and DRAINAGE CERTIFICATION
Commercial, Multi-Family and Subdivision Certification Form and Checklist
Project Name:
Date:
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.)
x Use “Yes” for items completed as described.
x Use “N/A” for items that are not applicable to the site being certified.
x 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: 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. Detention basin topography was prepared by a professional land surveyor registered in the state
of Colorado.
2. Both proposed and as-built contours are shown on the same plan sheet (dashed lines for
proposed and solid lines for as-built).
3. 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. Stage-storage-discharge tables are provided on a separate document.
5. 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
(tinyurl.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
South Rain Garden
Music District - 633/639 S. College
2/21/2017
B1501004
Yes
Yes
Yes
Yes
Yes
N/A
/15 Page 2
B.Water Quality and Quantity Detention Basin Grading: 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. 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. 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. Soft pan for low flow in detention basin.
x 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: 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. The location of the spillway is indicated on the as-built plan.
b. The width of the spillway is indicated on the as-built plan.
c. The elevation(s) of the spillway is shown on the as-built plan.
d. A concrete ribbon defines the location and grade of the spillway.
e. 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. There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
Yes
N/A
N/A
Yes
No
Yes
Yes
Yes
Yes
Yes
N/A
Yes
Yes
1.7%
concrete chase
/15 Page 3
4.Outlet Structure Certification
a. The orifice plate for the approved release rate is installed with the correct size and location of
the orifice.
b. The orifice plate for the water quality outlet is installed with the correct hole size, number of
rows and columns of holes.
c. 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. The well screen is the correct material and is installed as shown on the construction plans.
e. 100-year overflow grate elevation is . (Elev. A on detail D-46)
f. The top elevation of the water quality capture volume is . (Elev. B on detail
D-46)
g. Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the
top and bolted at the bottom.
h. 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: 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. All swales are located within the drainage easements as shown on the construction plans.
2. 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. As-built spot elevations on channels/swales are shown that correspond to spot elevations
shown on the approved construction plans.
4. 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. All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the
system. (Pictures at tie-in points suggested.)
6. 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. 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.)
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
N/A
Yes
Yes
/15 Page 4
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.
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.
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.
3. The as-built invert elevations have been verified and are shown on the plan and profile sheets of
the approved construction plans.
B.Storm Drain Pipe Installation Requirements: All pipes are installed in accordance with the
approved construction plans.
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.)
IV. Concrete Pans - FCSCM Vol.1, Ch.7, Sec.4.1.3.4
A.Construction/Installation: All concrete pans have been constructed in accordance with the
approved construction plans.
1. The concrete pans are the correct size/width as shown on the approved construction plans.
2. 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. 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. 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. The spot elevations shown on the concrete pan(s) have been verified and are shown on the as-
built drawings.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
Yes
Yes
/15 Page 5
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.
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
A.Construction/Installation: All culverts have been constructed and/or installed in accordance with
the approved construction plans.
1. All culvert sizes have been verified as indicated on the as-built construction plans as correct.
2. The culvert material type for all culverts installed is as on the approved construction plans and is
indicated on the as-built plans.
3. The as-built invert “in and out” elevations have been verified and are indicated on the as-built
construction plans.
4. 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: 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. The size of the sub-drains are as approved on the construction plans and are indicated on the as-
built plans.
2. The type of sub-drain, in particular the perforated and non-perforated sections of the drain, are
as indicated on the approved construction plans.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
N/A
No
N/A
N/A
/15 Page 6
3. The cover requirements per the construction plans are provided.
4. 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. The backfill materials for sub-drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6. 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.)
VIII. 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
A.Construction/Installation: All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1. The size (width and length) of the culverts are as shown on the approved construction plans.
2. 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. The sidewalk culvert opening is as shown on the approved construction plans or per the City’s
detail.
5. 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: All common open spaces have been graded in accordance with the approved
construction plans.
1. 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.
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
/15 Page 7
2. 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. 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
A.Construction: 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
A.Construction: All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1. All fabric was installed per the details on the approved construction plans.
XIII. Post-Construction Site Cleanup - FCSCM Vol.3, Ch.7
A.Construction: All construction debris and obstructions of any kind have been removed from
drainage paths.
1. All construction debris has been removed except in staging area(s).
2. All ruts have been smoothed out in all construction areas.
3. 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. 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. 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.
N/A
Yes
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
N/A
Project:
Date:
Outlet Elevation:4996 250 ft3
Grate Elevation:N/A 440 ft3
Crest of Pond Elev.:4996.4 4995.8
Maximum
Elevation
Minimum
Elevation cu. ft.acre ft cu. ft.acre ft
4995.0 N/A 49.4 0 0.0 0.00 0.0 0.00
4996.0 4995.0 831.4 1.0 440.4 0.01 440.4 0.01
4996.4 4996.0 1,205.8 0.4 407.4 0.01 847.9 0.02
South Rain Garden Stage Storage Curve
Contour Contour
Surface Area
(ft2)
Depth
Incremental Volume Cummalitive Volume
Existing Pond Stage Storage Curve
1052-002
Fort Collins, Colorado
F. Wegert
North Rain Garden
Elev at Design Volume:
Music District-633/639 S. College Ave.
2/21/2017
Pond Outlet and Volume Data
Design Volume:
Volume at Outlet:
Project Number:
Project Location:
Calculations By:
Pond No.:
2/21/2017 3:29 PM D:\Projects\1052-002\Drainage\Detention\
1052-002_Stage-Storage_South.xlsx\Pond
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4396 G REENFIELD D RIVE
W INDSOR , C OLORADO 80550
(970) 545-3908 FAX (970) 663-0282
www.earth-engineering.com
June 2, 2016
Bohemian Companies
262 East Mountain Avenue
Fort Collins, Colorado 80524
Attn: Mr. Riley Phipps (riley@bohemianfoundation.org)
Re: Supplemental Rain Garden Evaluation Report
The Music District Addition/Remodel – 633/639 South College Avenue
Fort Collins, Colorado
EEC Project No. 1154182
Mr. Phipps:
Earth Engineering Consultants, LLC (EEC) personnel have completed the limited field and
laboratory testing services of existing conditions within the recently completed “rain-garden”
situated off of the northeast corner of the renovated Music District building at the referenced site.
The supplemental field and laboratory exploration services were performed in general accordance
with the conversation/discussion EEC personnel had with Neenan Company personnel on May 26,
2016 regarding the construction of the rain-garden area. The limited exploration, in essence was
to verify current conditions, (i.e., thicknesses of the bio-retention sand media and the underlying
pea gravel zones), were in general accordance with the design details. A site diagram and our
results are included with this report.
OVERVIEW
For this limited rain garden evaluation assessment, a single hand driven slotted tube device was
advanced at a pre-determined/select location within the rain garden footprint as indicated on the
enclosed site diagram. The hand driven slotted tube device was extended to an approximate depth
of 2-feet below site grades to verify the presence and thickness of the bio-retention sand media
and underlying pea gravel materials. Samples of the extracted materials were then returned to our
laboratory for further evaluation. The results of the field and laboratory testing are presented with
this report.
FIELD EXPLORATION
As previously mentioned, EEC personnel conducted a limited field exploration consisting of
sampling the rain garden subsoils at a single pre-determined location to evaluate the bio-retention
Earth Engineering Consultants, LLC
EEC Project No. 1154182
The Music District – Rain Garden Evaluation
June 2, 2016
Page 2
sand media and underlying pea gravel thicknesses for compliance purposes. EEC personnel obtained
samples of the bio-retention sand media, pea gravel, and of the underlying native subsoils below the
rain garden for further laboratory testing purposes. The field exploration was conducted on May 27,
2016.
The thickness of the rain garden profile was completed by hand driving a slotted cylindrical soil
sampling sleeve, approximately 4-feet in length, and 2-1/2-inches diameter into the subsoils using a
“post-hole driving/hammer device”. A photograph of the soil sampling device along with the field
measured thicknesses of the bio-retention sand media and pea gravel, are presented on the enclosed
Rain Garden Site Diagram. The sampling device was extended into the underlying cohesive soils
below “in an effort” to capture the sand media and pea gravel materials within the slotted tube device.
The underlying subsoils were also evaluated as part of this study. All three (3) samples, (i.e., the
Bio retention sand media, pea gravel and the underlying clay subsoils) obtained in the field were
sealed and returned to the laboratory for further testing purposes.
As illustrated on the Rain Garden Site Diagram, the bio-retention sand media material measured at
least 12-inches in thickness and the underlying pea gravel layer was approximately 6 inches thick.
The underlying native subsoils below the rain garden profile in general consisted of a moist tan
cohesive material classified as lean clay with sand.
LABORATORY TESTING
Laboratory testing performed on each of the retrieved samples included an in-situ moisture
content, washed sieve analysis (ASTM C117 and C136), and for the underlying cohesive subsoils
an Atterberg limits (ASTM Specification D 4318) test was performed. A summary of the
laboratory test results for the samples tested and evaluated as part of this study are shown below
in Table I, and are also included on the attached summary sheets.
Table I – Field and Laboratory Test Results for Cover Material
Hand Auger
Boring No.
Field Measurements
of Recovered
Materials
Laboratory Testing - Soil Classification
In-Situ
Moisture,
%
Liquid
Limit
Plastic
Limit
Plasticity
Index
% (-)
No. 200
Sieve
Description
1
12 inches 16.0 NL NP NP 13.5 Sand Media
6 inches 4.7 NL NP NP 3.0 Pea Gravel
6 inches 19.0 31 20 11 70.1 Lean Clay with Sand
B-1
Rain Garden Diagram
The Music District - 619 South College Avenue
Fort Collins, Colorado
EEC Project #: 1154182 Date: May 2016
EARTH ENGINEERING CONSULTANTS, LLC
Approximate Location of
Slotted Tube Sample
Legend
Photo 2
Photo 1
1/2"(12.5 mm)
3/8"(9.5 mm)
No. 4 (4.75 mm)
No. 8 (2.36 mm)
No. 10 (2 mm)
No. 16 (1.18 mm)
No. 30 (0.6 mm)
No. 40 (0.425 mm)
No. 50 (0.3 mm)
No. 100 (0.15 mm)
No. 200 (0.075 mm)
Project:The Music District
Location:Fort Collins, Colorado
Project No:1154182
Sample ID:Rain Garden - Filter Media Material
Sample Desc.:Bioretention Sand Media - 12 Inch Section
Date:6/1/2016
In-Situ Moisture Content, %16.0
20
13.5
87
72
50
39
30
Sieve Size Percent Passing
EARTH ENGINEERING CONSULTANTS, LLC
SUMMARY OF LABORATORY TEST RESULTS
Sieve Analysis (AASHTO T 11 & T 27 / ASTM C 117 & C 136)
100
100
98
91
EARTH ENGINEERING CONSULTANTS, LLC
Summary of Washed Sieve Analysis Tests (ASTM C117 & C136)
Date:
Project:
Location:
Project No:
Sample ID:
Sample Desc.:
Cobble Silt or ClayGravel
Coarse Fine
Sand
Coarse Medium
6/1/2016
9.50 0.86 0.60
The Music District
Fort Collins, Colorado
1154182
Rain Garden - Filter Media Material
Bioretention Sand Media - 12 Inch Section
D100 D60 D50
0.29 ---
Fine
------
D30 D10 Cu CC
6"
5"
4"
3"
2.5"
2"
1.5"
1"
3/4"
1/2"
3/8"
No. 4
No. 8
No. 10
No. 16
No. 30
No. 40
No. 50
No. 100
No. 200
0
10
20
30
40
50
60
70
80
90
100
0.010.11101001000
Fi
n
e
r
b
y
W
e
i
g
h
t
(
%
)
Grain Size (mm)
Standard Sieve Size
1/2"(12.5 mm)
3/8"(9.5 mm)
No. 4 (4.75 mm)
No. 8 (2.36 mm)
No. 10 (2 mm)
No. 16 (1.18 mm)
No. 30 (0.6 mm)
No. 40 (0.425 mm)
No. 50 (0.3 mm)
No. 100 (0.15 mm)
No. 200 (0.075 mm)
Project:The Music District
Location:Fort Collins, Colorado
Project No:1154182
Sample ID:Rain Garden - Pea Gravel Material
Sample Desc.:Pea Gravel Layer - Aproximately 6-inches
Date:6/1/2016
In-Situ Moisture Content, %4.7
3.0
17
11
9
7
5
Percent Passing
21
EARTH ENGINEERING CONSULTANTS, LLC
SUMMARY OF LABORATORY TEST RESULTS
Sieve Analysis (AASHTO T 11 & T 27 / ASTM C 117 & C 136)
100
99
44
22
Note: The pea gravel layer was encountered below the 12-inch section of Bioretention sand media and was measured at a
thickness of at least 6 inches. The gradation results as presented herein may be slightly skewed due to possible infiltration
of the sand media from above and possibly influenced from the sandy lean clay / clayey sand native subsoils below.
Sieve Size
EARTH ENGINEERING CONSULTANTS, LLC
Summary of Washed Sieve Analysis Tests (ASTM C117 & C136)
Date:
Project:
Location:
Project No:
Sample ID:
Sample Desc.:
Cobble Silt or ClayGravel
Coarse Fine
Sand
Coarse Medium
6/1/2016
12.50 6.13 5.26
The Music District
Fort Collins, Colorado
1154182
Rain Garden - Pea Gravel Material
Pea Gravel Layer - Aproximately 6-inches
D100 D60 D50
3.19 0.49
Fine
12.45 3.38
D30 D10 Cu CC
6"
5"
4"
3"
2.5"
2"
1.5"
1"
3/4"
1/2"
3/8"
No. 4
No. 8
No. 10
No. 16
No. 30
No. 40
No. 50
No. 100
No. 200
0
10
20
30
40
50
60
70
80
90
100
0.010.11101001000
Fi
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r
b
y
W
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i
g
h
t
(
%
)
Grain Size (mm)
Standard Sieve Size
Material Designation: Native Cohesive Subsoils below Rain Garden
Sample Location: Rain Garden - Slotted Tube Sample #1
Material Description: Lean Clay with Sand
AASHTO Classification: A-6
Group Index: 6
Client: Bohemian Companies
Project: The Music District - Rain Garden Evaluation
Fort Collins, Colorado
Project No:
Date May 2016
In-Situ Moisture Content, % 19.0
Plastic Limit 20
Plasticity Index 11
Soil Description Lean Clay with Sand70.1%
No. 40
Sieve Size
No. 10
Percent Passing
98%
97%
93%
No. 200
Summary of Laboratory Gradation Test
Earth Engineering Consultants, LLC
No. 4
1154182
Atterberg Limits and Soil Classification
Liquid Limit 31
-10%
1%
12%
23%
34%
45%
56%
67%
78%
89%
100%
0.0010.010.1110100
Pe
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LEGEND:
( IN FEET )
010 10 20 30
1 INCH = 10 FEET
RD
PROPOSED VERTICAL
CURB/GUTTER
PROPOSED HEADER
CURB (SEE DETAIL)
633/639 SOUTH
COLLEGE AVENUE
EX. FF = 5000.01
621 SOUTH
COLLEGE AVENUE
EX. FF = 4998.82
633 1/2 SOUTH
COLLEGE AVENUE
EX. FF = 4997.88
MATCH INTO
EXISTING
CONCRETE
PROPOSED VERTICAL 6" STEP
BETWEEN PROPOSED CONCRETE WALK
AND EXISTING DECK (SEE NOTE 11).
EXISTING CONCRETE DECK
(RE: LANDSCAPE ARCHITECT)
EXISTING PARKING
STRIPES (TYP.)
PROPOSED WALL (RE:
LANDSCAPE ARCHITECT
PROPOSED CONCRETE STEPS
WITH 4 (FOUR) 6" RISERS AND 3
(THREE) 1' TREADS (SEE NOTE 11).
PROPOSED CONCRETE STEPS
WITH 5 (FIVE) 6" RISERS AND 4
(FOUR) 1' TREADS (SEE NOTE 11).
PROPOSED CONCRETE PAVER PATIO
(RE: LANDSCAPE ARCHITECT)
PROPOSED DECK
(RE: ARCHITECT)
PROPOSED RAISED CONCRETE PAVER PATIO
(RE: LANDSCAPE ARCHITECT)
APPROXIMATE LIMITS
OF CONSTRUCTION
PROPOSED PARKING STRIPE (TYP.
- RE: LANDSCAPE ARCHITECT)
PROPOSED PARKING STRIPE (TYP.
- RE: LANDSCAPE ARCHITECT)
PROPOSED OUTFALL
CURB/GUTTER
MATCH INTO EXISTING
CONCRETE RIBBON CURB
MATCH INTO EXISTING
CONCRETE RIBBON CURB
MATCH INTO
EXISTING
CONCRETE
UTILITY PADS
MATCH INTO EXISTING
CONCRETE RIBBON CURB
PROPOSED CONCRETE STEPS
WITH 4 (FOUR) 5" RISERS AND 3
(THREE) 1' TREADS (SEE NOTE 11).
PROPOSED CONCRETE STEPS WITH 5 (FIVE) 6"
RISERS AND 4 (FOUR) 1' TREADS (SEE NOTE 11).
PROPOSED WALL (RE: LANDSCAPE ARCHITECT
PROPOSED WALL
(RE: ARCHITECT)
MATCH INTO CONCRETE
FOOTER OF EXISTING
STAIRWELL
MATCH INTO PROPOSED
DOORS (RE: ARCHITECT)
MATCH INTO PROPOSED
DOORS (RE: ARCHITECT)
MATCH INTO
EXISTING CONCRETE
MATCH INTO EXISTING
CONCRETE FLUSH SIDEWALK
SOUTH COLLEGE AVENUE
DALZELL ALLEY (20-FT ALLEY)
PROPOSED FLOWER POT (TYP.
- RE: LANDSCAPE ARCHITECT)
MATCH INTO
EXISTING CONCRETE
MATCH INTO EXISTING
CURB (TYPICAL ALL SIDES)
EXISTING RIGHT-OF-WAY
PROPOSED 2-FEET
WIDE VALLEY PAN
PROPOSED 2-FEET
WIDE VALLEY PAN
PROPOSED
2' WIDE
VALLEY PAN
EXISTING RIGHT-OF-WAY
EXISTING
PROPERTY LINE
PROPOSED
2' WIDE
VALLEY PAN
MATCH INTO
EXISTING ASPHALT
EXISTING STRIPING
SEE NOTE 9
MATCH INTO
EXISTING ASPHALT
PROPOSED 2-FT WIDE
CONCRETE CHASE WITH METAL
WAFFLE PLATE (SEE DETAIL)
PROPOSED VERTICAL
CONCRETE CURB/GUTTER
RD
RD
PROPOSED WALL (RE:
LANDSCAPE ARCHITECT
PROPOSED CONCRETE STEPS
WITH 3 (THREE) 6" RISERS AND 2
(TWO) 1' TREADS (SEE NOTE 11).
EXISTING DECK
(SEE NOTE 11).
PROPOSED CONCRETE STEPS
WITH 3 (THREE) 6" RISERS AND 2
(TWO) 1' TREADS (SEE NOTE 11).
SEE NOTE 12.
MATCH INTO
EXISTING GROUND MATCH INTO
EXISTING GROUND
MATCH INTO
EXISTING GROUND
PROPOSED HANDICAP RAMP
PROPOSED
HANDICAP RAMP
PROPOSED DRAINAGE
SWALE @ 2.0% SLOPE
PROPOSED WALL
(RE: ARCHITECT
BEGIN VERTICAL CURB/GUTTER
END VERTICAL
CURB/GUTTER
TAPER VERTICAL CURB FROM
0" TO 6" FOR LENGTH OF RAMP
TAPER VERTICAL CURB FROM
0" TO 6" FOR LENGTH OF RAMP
2' LENGTH TRANSITION
FROM 1' WIDE GUTTER
TO 2' WIDE VALLEY PAN
2' LENGTH TRANSITION FROM 1' WIDE
GUTTER TO 2' WIDE VALLEY PAN
PROPOSED RAIN
GARDEN (SEE NOTE 5.)
PROPOSED RAIN
GARDEN (SEE NOTE 5.)
MATCH INTO DOOR
(RE: ARCHITECT)
PROPOSED
DRAINAGE SWALE
GRA
D
E
BRE
A
K
GRADE
BREAK
GR
A
D
E
BR
E
A
K
RD
RD
RD
RD
RD
RD
RD
RD
RD
RD
RDRDRDRD
RD
RD
PROPOSED BOLLARDS WITH REMOVABLE
CHAIN (RE: LANDSCAPE ARCHITECT)
EXISTING CONCRETE DRIVEWAY
WIDTH REDUCED - SEE DEMOLITION
AND SITE PLAN BY RUSSELL+MILLS
PROPOSED BOLLARDS (TYP. -
RE: LANDSCAPE ARCHITECT)
PROPOSED 2-FT WIDE CONCRETE
CHASE WITH METAL WAFFLE PLATE
@ 2% SLOPE (SEE DETAIL)
PROPOSED 2-FT WIDE CONCRETE
CHASE WITH METAL WAFFLE
PLATE @ 2% SLOPE (SEE DETAIL)
PROPOSED 7.0'
WIDE SIDEWALK PROPOSED 7.0'
WIDE SIDEWALK
20.0'
28.0'
CONNECT PROPOSED CONCRETE
CHASE TO EXISTING CURB FLOWLINE
CONNECT PROPOSED CONCRETE
CHASE TO EXISTING CURB FLOWLINE
20.0' WIDE EMERGENCY
ACCESS EASEMENT
(BY SEPARATE DOCUMENT)
PRESERVE AND PROTECT
EXISTING TREE (SEE NOTE 13.)
PRESERVE AND PROTECT
EXISTING TREE (SEE NOTE 13.)
DEPICTS FIRST
FLOOR FOOTPRINT
DEPICTS FIRST
FLOOR FOOTPRINT
GRADING AT SOUTHWEST CORNER OF BLDGA
SEE DETAIL A
ON THIS SHEET
CURB UNDER
CANTILEVER
(RE: ARCHITECT)
EXISTING TREE
PROPOSED
VERTICAL
CURB AND
GUTTER
FLOWLINE
RADIUS = 5'
PROPOSED
VERTICAL CURB
AND GUTTER
RD
1
1
1
1
CURB UNDER
CANTILEVER
(RE: ARCHITECT)
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
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Fo
r
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C
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l
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C
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l
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8
0
5
2
4
E
N
G
I
N
E
E
R
N
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H
T
R
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N
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N
PH
O
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E
:
9
7
0
.
2
2
1
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4
1
5
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7
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2
2
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PROPOSED 2'
WIDE CURB CUT
SE
2
2
2
REPLACE EXISTING
VERTICAL CURB
MATCH INTO DOOR
(RE: ARCHITECT)
PROPOSED 15" NYLOPLAST
DRYWELL GRATE = 4995.13
PROPOSED 4" UNDERDRAIN
(SEE DRYWELL DETAIL)
3
2
0.
5
%
4%
1.7%
1%
0.
8
%
THESE RECORD DRAWINGS, PRODUCED BY NORTHERN ENGINEERING
SERVICES, INC., ARE BASED IN WHOLE, OR IN PART, UPON INFORMATION
PROVIDED BY OTHERS. NORTHERN ENGINEERING SERVICES, INC. ASSUMES
NO LIABILITY FOR THE ACCURACY OR COMPLETENESS OF THIS INFORMATION.
RECORD DRAWING
SE
SE
SE
SE
SE
VAULT
ELEC
E
G
C
ELEC
VAULT
ELEC
VAULT
CABLE
T
ELEC
ELEC
VAULT
CABLE
T
VAULT
ELEC
VAULT
ELEC
T
CONTROL
IRR
C.O.
G
G
T
IRR
CS
CSW
W
W
CS
W
W
IRR
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
EL
E
C
CONTROL
IRR
SE
SE SE SE
SE
SE
SE
SE
F
F
F
F
F
F
F
F
F
F
F
F
TC
97
.
0
0
GRD
97.
7
5
INV
97.
3
7
IN
V
97.
1
5
FL96.4
5
FL96.
2
5
4:1
TC/
F
F
97.
0
0
96.
8
6
FF/
T
C
97.
0
0
FF/
T
C
97.
0
0
FF/
T
C
97.
0
0
2.0%
97.04
4:
1
4:
1
HP97.
6
7
GRD
97.5
0
96.9
7
2.0%
1.3%
2.5%2.5%
97.40
3.1%2.3%
GRD
97.
0
0
BS
97.0
4
FF/
T
C
98.
8
2
FF/
T
C
98.
8
2
TS
98.
6
6
5.1
%GR
D
97.
0
0
GR
D
97.
0
0
GRD
96.8
9
GR
D
97.
1
8
RD
RDRDRD
T
TTBC
:
9
7
.
4
4
FL:
9
6
.
9
4
TBC
:
9
7
.
4
3
FL:
9
6
.
9
3
TBC
:
9
7
.
1
7
FL:
9
6
.
7
0
PROPOSED RAIN
GARDEN (SEE NOTE 5)
CONNECT PROPOSED
CONCRETE CHASE TO
CURB FLOWLINE
(FLOWLINE
CONSTRUCTED BY
OTHERS)
PRESERVE AND
PROTECT EXISTING
TREE
PRESERVE AND
PROTECT EXISTING
TREE
PROPOSED
2-FT WIDE PAN
EXISTING BUILDING FOOTPRINT
TO BE REMOVED (RE: ARCHITECT)
PROPOSED BUILDING
FOOTPRINT (RE: ARCHITECT)
PROPOSED SEAT WALL WITH 4" HEIGHT x
6" WIDTH OPENINGS AT 0.5% SLOPE (RE:
LANDSCAPE ARCHITECT - SEE NOTE 9)
REMOVE
EXISTING CURB
EXISTING BUILDING FOOTPRINT
TO BE REMOVED (RE: ARCHITECT)
PROPOSED BUILDING
FOOTPRINT (RE: ARCHITECT)
PROPOSED CONCRETE STEPS
WITH 2 (TWO) 4.25" RISERS AND
1 (ONE) 1' TREAD (SEE NOTE 9).
PROPOSED CONCRETE STEPS
WITH 3 (THREE) 6.5" RISERS AND 2
(TWO) 1' TREAD (SEE NOTE 9).
PROPOSED
VERTICAL CURB
LIMITS OF CONSTRUCTION
LIMITS OF PHASE
1 CONSTRUCTION
PROPOSED OUTFALL CURB
PROPOSED OUTFALL CURB
MATCH INTO PHASE 1
CONSTRUCTION
MATCH INTO PHASE 1
CONSTRUCTION
MATCH INTO PHASE 1
CONSTRUCTION
MATCH INTO EXISTING
MATCH INTO EXISTING
MATCH INTO PHASE 1
CONSTRUCTION
MATCH INTO EXISTING
MATCH INTO EXISTING
PROPOSED
OUTFALL CURB
LIMITS OF CONSTRUCTION
PROPOSED 6" THICKEN
CONCRETE (SEE DETAIL)
6:1
FL
96
.
0
5
PROPOSED VERTICAL CURB
T
T
MATCH INTO PHASE 1
CONSTRUCTION
PRESERVE AND
PROTECT CURB STOP
AND WATER METER
FL97.
7
6
HP
97.9
4
TC:
9
5
.
8
9
INV
:
9
5
.
3
9
(TC
:
9
6
.
0
3
)
INV
:
9
5
.
5
3
MATCH INTO PHASE 1
CONSTRUCTION
FL(94
.
5
5
)
97.1
8
96.
8
0
2.
0
%
5.0%
EX. FINISHED FLOOR
ELEV. = 4997 EX. FINISHED FLOOR ELEV. = 4997
9.
2
%
8.
9
%
0.8%
1.5%97.3
6
96.
8
4
TC97.
0
0
TC97.
0
0
TC97.
0
0
2.0%
2.
0
%
2.
0
%
2.
0
%
2.
0
%
96.
8
0
96.
8
0
96.
9
0
5.
0
%
5.
0
%
2.
0
%
TC97.
0
0
96.
8
2
2.0%
2.0%
BS96.
1
3
BS96.
1
3
2.
0
%
0.7%
4.3%4.2%2.0%
0.8%
96.
6
1
96.
6
1
96.
6
1
96.
6
1
96.8
0
FF/
T
C
97.
0
0
5.
0
%
4:
1
96.
8
0
5.
0
%
FF/
T
C
97.
0
0
2.
0
%
3.1
%
(2
.
2
%
)
(1
.
6
%
)
(1.5%
)
(1.6%)
(3.5%
)
5.
0
%
2.0
%
PROPOSED WALK (RE:
LANDSCAPE ARCHITECT)
PROPOSED PLAZA(RE:
LANDSCAPE ARCHITECT)
PR
O
P
O
S
E
D
P
L
A
Z
A
(R
E
:
L
A
N
D
S
C
A
P
E
AR
C
H
I
T
E
C
T
)
(1
.
0
%
)
(0
.
9
%
)
(0.
8
%
)
(1.2%
)
(0.3%)
(1
.
2
%
)
(1.5
%
)
(0.8
%
)
(0.7
%
)
(2.4%
)
2.2
%
97.8
4
5.1%
5.
0
%
7:
1
621 S. COLLEGE AVE.
EX. FINISHED FLOOR
ELEV. = 4998.82
TS98.
6
6
WALK PART OF PHASE 1
CONSTRUCTION
PHASE 1 CONSTRUCTION
SI
D
E
W
A
L
K
P
A
R
T
O
F
PH
A
S
E
1
C
O
N
S
T
R
U
C
T
I
O
N
619 S. COLLEGE AVE.
HP97.
7
7
2.1%
PROPOSED WALK (RE:
LANDSCAPE ARCHITECT)
96.
8
6
2.
0
%
2.
0
%
2.3
%
0.8%
2.3%
1.3%
2.1%
6.2%
6.5
%
4.2%
(1.
2
%
)
(1
.
1
%
)
(3.9%)
(97
.
2
8
)
(97
.
5
9
)
(97
.
6
7
)
(97
.
5
7
)
(97
.
5
4
)
(97
.
4
5
)
FL
(94
.
7
9
)
FL
(95
.
1
2
)
TBC
(97
.
6
5
)
(96
.
9
9
)
GRD
(95
.
9
6
)
(96
.
0
1
)
(95
.
8
5
)
(96
.
0
4
)
(96
.
1
0
)
96.7
9
(97
.
5
0
)
FL
(97
.
6
7
)
(97
.
4
8
)
(97
.
4
1
)
(97
.
6
1
)
(97
.
6
5
)
(97
.
9
2
)
(97
.
5
7
)
(97
.
7
6
)
(97
.
3
8
)
(97
.
3
3
)
(98
.
3
7
)
(98
.
4
4
)
(96
.
5
5
)
(96
.
0
3
)
(96
.
0
1
)
(96.00)
(96
.
0
1
)
(96
.
0
2
)
(98
.
4
3
)
PAT
I
O
(97
.
7
5
)
(97
.
6
6
)
(97
.
7
1
)
(97
.
7
2
)
(97
.
6
3
)
(97
.
5
5
)
(97
.
6
3
)
(97
.
4
7
)
TC96.
7
0
(97
.
5
4
)
3:1
2.0%
2.0%
95.
0
9
FL
97.4
3GRD
97.4
2
GRD
6:
1 2.5%
10:1
97.4
3
GRD
(97
.
9
8
)
(98
.
4
3
)
PAT
I
O
(98
.
4
2
)
PAT
I
O
DRAINAGE
SWALE
3.7
%1.0%
2.0
%
2.3%FL/
H
P
98.
0
2
2.1
%
2.1
%
2.0
%(1.3%
)
2.0
%
1.8
%
5.0%
3.5%
3:
1
3:1
95.0
9
95.8
8
95.0
9
95.0
9
3.
0
%
3.6%
4.8%
5.4%
4.0%
2.6%
3:1
10
:
1
2.5%
2.3%
(2.
2
%
)
9.0%
8:
1
2' WIDE CONCRETE CHASE WITH METAL
WAFFLE PLATE @ 2% SLOPE (SEE DETAIL)
2' WIDE CONCRETE CHASE WITH METAL
WAFFLE PLATE @ 1% SLOPE (SEE DETAIL)
CONTRACTOR TO COORDINATE
PROPOSED AC UNIT WITH
BUILDING ARCHITECTURAL PLANS.
4:
1
RD
RD
RD
RD RD
S.
C
O
L
L
E
G
E
A
V
E
N
U
E
DA
L
Z
E
L
L
A
L
L
E
Y
NORTHING: 128242.70
EASTING: 194672.27
(PROPERTY CORNER)
NORTHING: 128243.76
EASTING: 194482.36
(PROPERTY CORNER)
2.0%
TS
96.
8
4
TS96.
8
4
PROPOSED 15" NYLOPLAST
DRYWELL GRATE = 4995.01PROPOSED 4" UNDERDRAIN
(SEE DRYWELL DETAIL)
TC
97
.
0
0
97.1
4 96.9
1
HP
97.
1
7
6:1
HP
97.
3
5
2.0%
HP
97.
5
7
1.2%
2.
0
%
2.0%
4.0
%
2.7%
2.0%
3.
1
%
97.5
2
97.
7
7
2.0%
5.
0
%
2.0%
96.
8
7
3.
6
%
(97
.
4
8
)
3.0
%
3.
9
%
2.4%
HP/FL
97.31
GRD
97.
8
9
5.
0
%
GRD
97.
6
8
5.
0
%
5.
0
%
GRD98.
0
0
FL
:
9
7
.
2
1
TB
C
:
9
7
.
7
1
97
.
2
4
(97
.
4
1
)
2.0%
2.0%
CONTRACTOR TO PROVIDE VAPOR BARRIER/MEMBRANE ALONG
BUILDING WHERE PROPOSED GROUND IS HIGHER THAN EXISTING
FINISH FLOOR ELEVATION AS RECOMMENDED BY BUILDING ARCHITECT.
1.9%
1.3%
96.51
GR
D
98
.
0
0
GR
D
97
.
8
9
FL
97.
5
7
1' WIDE VALLEY PAN AT
3.0% SLOPE (SEE DETAIL)
ALL SOIL (NOT MULCH) IN LANDSCAPE BEDS ADJACENT TO SEAT
WALL SHALL BE PLACED SUCH THAT THE TOP OF SOIL IS AT THE
SAME ELEVATION AS INVERT ELEVATIONS OF DRAIN OPENINGS
TO ALLOW FOR PROPER DRAINAGE.
GRD97.
5
0
GRD96.
9
2
0.7%
3.
1
%
(97
.
4
4
)
PROPOSED WALK (RE:
LANDSCAPE ARCHITECT)
BS
97.
0
4
4.
0
%
3%
Sheet
Of 7 Sheets
TH
E
M
U
S
I
C
D
I
S
T
R
I
C
T
-
6
1
9
C
O
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G
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A
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.
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r
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2
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:
9
7
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.
2
2
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.
4
1
5
8
F
A
X
:
9
7
0
.
2
2
1
.
4
1
5
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C200
GR
A
D
I
N
G
P
L
A
N
LEGEND:
( IN FEET )
010 10 20 30
1 INCH = 10 FEET
FIELD SURVEY BY:
NOTES:
77.71
(77.90)
1.8%
(1.8%)
RD
T
SE
RD
1 1
1
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
1
1
1
THESE RECORD DRAWINGS, PRODUCED BY NORTHERN ENGINEERING
SERVICES, INC., ARE BASED IN WHOLE, OR IN PART, UPON INFORMATION
PROVIDED BY OTHERS. NORTHERN ENGINEERING SERVICES, INC. ASSUMES
NO LIABILITY FOR THE ACCURACY OR COMPLETENESS OF THIS INFORMATION.
RECORD DRAWING
PLAN VIEW
NOT TO SCALE
DIR
E
C
T
I
O
N
OF F
L
O
W
1' WIDE PAN
PROPOSED WALK (RE:
LANDSCAPE ARCHITECT)
DIRECTIO
N
OF FLOW
INSTALL 28.8' OF THICKEN CONCRETE EDGE
FLOWLINE
LANDSCAPING (RE:
LANDSCAPE ARCHITECT)
2' WIDE CONCRETE CHASE
WITH METAL WAFFLE PLATE
ELEV. = 4996.61
TOP OF PLATE ELEV. = 4996.64
INVERT OF CHASE ELEV. = 4996.00
TOP OF PLATE ELEV. = 4996.64
INVERT OF CHASE ELEV. = 4995.95
BOTTOM OF STEP ELEV. = 4996.72
CONCRETE STEPS
FROM PHASE 1
ELEV. = 4995.09 ELEV. = 4995.03
ELEV. = 4995.31
9.2%
2.1%
2.1%
3:
1
7:
1
3.
5
%
SE
SE
SE
SE
SE SE SE SE SE SE SE SE SE SE SE SE SE SE
STEEL LANDSCAPING EDGE
(RE: LANDSCAPE ARCHITECT)
TOP OF CONC. ELEV. = 4996.51
GROUND ELEV. = 4996.11
TOP OF CONC. ELEV. = 4996.70
GROUND ELEV. = 4996.20
TOP OF CONC. ELEV. = 4996.66
GROUND ELEV. = 4996.16
TOP OF CONC. ELEV. = 4996.58
GROUND ELEV. = 4996.08
TOP OF CONC. ELEV. = 4996.14
GROUND ELEV. = 4995.64
ELEV. = 4995.26
ELEV. = 4995.40
4:
1 10
:
1
3.
5
%
RAIN GARDEN
ELEV. = 4995.74
9.2%
3:
1
3:1
CONCRETE CHASE WITH
WAFFLE PLATE (SEE DETAIL)
MINIMUM 12" THICK LAYER OF BIORETENTION
SAND MEDIA (SEE BIORETENTION SAND
MEDIA SPECIFICATION FROM CITY OF FORT
COLLINS)
MINIMUM 6" THICK LAYER OF
PEA GRAVEL DIAPHRAGM
WIDTH VARIES
(SEE GRADING PLAN)
SLOPE VARIES
FROM 10:1 TO 5:1
SLOPE VARIES
FROM 10:1 TO 5:1
FLOWLINE OF RAIN GARDEN
(SEE GRADING PLAN)
1%1%
DEPTH VARIES
(SEE GRADING PLAN)
Sheet
Of 7 Sheets
TH
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1
9
C
O
L
L
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CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
CONCRETE CHASE AND THICKEN SIDEWALK DETAIL001
RAIN GARDEN CROSS-SECTION005
6"
1"
1 1/2"R.
1'-6"
2" R.
4-1/2"
12
"
6"
OUT FALL CURB & GUTTER
1-1/2"
6"
1-1/2" TO
6"
1"
1 1/2"R.
1'-6"
2" R.
4-1/2"
12
"
6"
VERTICAL CURB & GUTTER
1-1/2"
6"
1-1/2" TO
ON-SITE 2' WIDE VALLEY PAN004
PLAN
A
A
C
B B
C
SECTION A-A
SECTION B-B
DETAIL 1SECTION C-C
PRIVATE CURB AND GUTTER003
MAX 30°
PROPOSED GRADE
NEW CONCRETE
THICKEN CONCRETE EDGE002
1.5' MAX
1
THESE RECORD DRAWINGS, PRODUCED BY NORTHERN ENGINEERING
SERVICES, INC., ARE BASED IN WHOLE, OR IN PART, UPON INFORMATION
PROVIDED BY OTHERS. NORTHERN ENGINEERING SERVICES, INC. ASSUMES
NO LIABILITY FOR THE ACCURACY OR COMPLETENESS OF THIS INFORMATION.
RECORD DRAWING