HomeMy WebLinkAboutSite Certifications - 12/05/2019Drainage Certification Letter November 20, 2019
First Stop Plaza Page 1 of 2
November 20, 2019
Wes Lamarque
City of Fort Collins
700 Wood Street
Fort Collins, CO 80521
RE: 1st Stop Plaza
Fort Collins, Colorado
Dear Mr. Lamarque:
This drainage certification letter is provided to verify as-constructed conditions for 1st Stop
Plaza. King Surveyors completed survey work October 17, 2019, to verify general compliance
with the Final Utility Plans for 1st Stop Plaza dated May 5, 2019, by Northern Engineering.
Included in this drainage certification submittal are the following:
Appendix A - City of Fort Collins Overall Site and Drainage Certification Form.
Appendix B - City of Fort Collins During Construction Inspection Checklist and photographs
provided by contractor.
Appendix C - As-constructed record drawings for Grading and Storm Drain Plan and Profile
Sheets.
The project is part of a regional detention and water quality pond. Therefore, no detention or
water quality infrastructure was constructed as part of the project.
Accepted 12/5/2019 WL
Drainage Certification Letter November 20, 2019
First Stop Plaza Page 2 of 2
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 II.A.3: Excess fill from the Suniga Road project was used to raise the existing elevations on
Lot 1 of 1st Stop Plaza. A result of this excess fill, the drainage swale located north of the
emergency access was shifted further north to improve the drainage from Lot 1. The revised
contours and topography from the excess fill are depicted on Sheet C4.0 of the record grading
drawing.
• Item II.A.4: Excess fill from the Suniga Road project was used to raise the existing elevations on
Lot 1 of 1st Stop Plaza. A result of this excess fill raised the existing grades along the north and
east parameter of the site that turf reinforcement mats were no longer necessary.
• Item III.B.2: Northern Engineering did not observe construction. Northern Engineering was
unable to verify the encasements and clearances for the storm sewer.
• Item III.B.3: Northern Engineering did not observe construction. Northern Engineering was
unable to verify the joint types and construction methods for the storm sewer.
• Item IX.A: The driveway entrance at College Avenue and the flowline of the driveway gutter
was constructed higher than the flowline of the existing valley pan. Therefore, the sidewalk
culvert was relocated onto College Avenue to drain the existing valley pan.
• Item X: Excess fill from the Suniga Road project was used to raise the existing elevations on Lot
1 of 1st Stop Plaza. The revised contours and topography from the excess fill are depicted on
Sheet C4.0 of the record grading drawing.
• Item X.A.3: Excess fill from the Suniga Road project was used to raise the existing elevations on
Lot 1 of 1st Stop Plaza. A result of this excess fill raised the existing grades along the north and
east parameter of the site that turf reinforcement mats were no longer necessary.
Please feel free to contact me with any questions you may have.
Northern Engineering Services, Inc.
Frederick S. Wegert, PE
Project Engineer
Appendix A
Overall Site and Drainage Certification Form
8/16 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.)
•Use “Yes” for items completed as described.
•Use “N/A” for items that are not applicable to the site being certified.
•If any blanks are “No,” attach an explanation referencing the item number below.
Attach an explanation or description of the as-built condition for any items listed or for anything not listed but
shown on the approved construction plans.
Provide an as-built redline or Mylar drawing with the following:
I.Water Quality and Quantity Detention Basin Certification - FCSCM Vol.2, Ch.10
For multiple detention basins on a site, provide the following for each basin separately:
A. Volume: 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
1st Stop Plaza
11/20/2019
Not Applicable
N/A
N/A
N/A
N/A
N/A
N/A
8/16 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.
•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.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
8/16 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
Yes
Yes
No
No
Yes
Yes
Yes
Yes
8/16 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.
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
8/16 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 Type C, R, 13 and 16 inlet covers are stenciled or stamped with the following (or an
equivalent) 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.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
8/16 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
N/A
N/A
N/A
No
Yes
Yes
Yes
Yes
Yes
No
Yes
8/16 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
Yes
No
N/A
N/A
N/A
Yes
Yes
Yes
Yes
8/16 Page 8
XVI. Certification and Erosion Control Measures
A. All temporary erosion control measures shall be removed upon stabilization. If at the time of preparing
this certification there are any erosion control measures still remaining on the site, please note them in
the narrative and verify that they need to remain at this time. If in doubt as to the need for any control
measure, please consult with the Erosion Control Inspector at 970-221-6700.
XVII.Statement of Compliance
A. This certification is signed and stamped. By signing this form, the engineer(s) attests that he/she has
visited and observed the site, and to the best of his/her knowledge, the as-built conditions of the drainage
facilities are as described in the above form and in the enclosed as-built plans.
B.Failure to properly disclose all known information could result in the rejection of this certification and
prevent the release of any and all Stormwater Utility permit holds on Building Permits and/or Certificates
of Occupancy within this development.
XVIII.Signature and Stamp by a Colorado-Registered Professional Engineer
Engineer’s contact information:
Name:
Email:
Phone:
Company:
Address:
PE Stamp
Frederick S. Wegert
fred@northernengineering.com
(970) 568-5408
Northern Engineering
301 N. Howes Street, Suite 100
Fort Collins, Colorado 80521
11/20/19
Appendix B
During Construction Inspection Checklist
Appendix C
Record Drawings
D
VAULT
F.O.F.O.
C
FO
FO
FO
FO
FO
FO
EE
EEEE
G
G
G
G
D
ST
ST
ST ST
ST
ST ST ST
D
VAULT
F.O.F.O.
C
FO
FO
FO
FO
FO
FO
EE
EEEE
G
G
G
G
D
ST
ST
ST ST
ST
ST ST ST
EXISTING SIDEWALK
0.8
%
2.0
%
1.0%
2.0%
EXISTING BUILDING
1006 N. COLLEGE AVENUE
NO
R
T
H
C
O
L
L
E
G
E
A
V
E
N
U
E
1008 N. COLLEGE AVENUE
1010 N. COLLEGE AVENUE
CROWNE AT OLD
TOWN NORTH
SUBDIVISION
938 N. COLLEGE AVENUE
BROOKS MINOR SUBDIVISION
EX
.
S
I
D
E
W
A
L
K
PROPOSED SIDEWALK BY INTERWEST CONSULTING GROUP (SEE SUNIGA
DRIVE IMPROVEMENTS PREPARED BY INTERWEST CONSULTING GROUP).
FUTURE SUNIGA DRIVE (SEE SUNIGA DRIVE IMPROVEMENTS
PREPARED BY INTERWEST CONSULTING GROUP)
EX. COLUMN (TYP.)
UTILITY & DRAINAGE
EASEMENT (SEE PLAT)
5' DRAINAGE EASEMENT
PER 1ST STOP PLAZA
UTILITY & DRAINAGE
EASEMENT (SEE PLAT)
31' UTILITY
EASEMENT
10' UTILITY EASEMENT
PER 1ST STOP PLAZA
5' DRAINAGE EASEMENT
PER 1ST STOP PLAZA
0.5
%
T
T
2' WIDE VALLEY PAN
2' WIDE VALLEY PAN
T
70.6
8
FL
71.6
0
HP
69.2
7
LP
70.4
5FL70.3
0
FL
70.9
1
FL
71.2
0FL
71.
4
3
FL
72.1
2
HP
71.5
4FL
71.9
0
FL
71.6
6
FL
71.4
3
FL
(71
.
0
7
)
(71
.
9
8
)
(72
.
2
2
)
(72
.
3
1
)
(72
.
3
1
)
(72
.
0
5
)
70.96
FL
71.0
2
FL
70.3
6
FL
70.4
2
FL
71.6
1HP
71.6
4
FL
(71
.
1
0
)
(70
.
9
1
)
(70
.
7
8
)
(70
.
4
6
)
(70
.
0
0
)
70.
5
9
FL
69.9
6
FL
PROPOSED BICYCLE RACK
(RE: LANDSCAPE ARCHITECT)
PROPOSED 2' WIDE
SIDEWALK CULVERT
MATCH INTO EXISTING
LIP OF GUTTER
EX. TRASH ENCLOSURE
MATCH INTO EXISTING CONCRETE
PAD FOR TRASH ENCLOSURE
SAWCUT LINE (TYP.)
EX. CONCRETE BLOCK
RETAINING WALL
EX. CONCRETE
VALLEY PAN
EX. CONCRETE
VALLEY PAN
1
1
3
3
1
2
SAWCUT LINE
2
2
2
PROPOSED 30" STORM SEWER BY INTERWEST
CONSULTING GROUP (SEE SUNIGA DRIVE
IMPROVEMENTS PREPARED BY INTERWEST
CONSULTING GROUP),.
EXISTING TYPE-R INLET
PROPOSED STORM INLET BY INTERWEST
CONSULTING GROUP (SEE SUNIGA DRIVE
IMPROVEMENTS PREPARED BY INTERWEST
CONSULTING GROUP),.
PROPOSED MANHOLE BY INTERWEST
CONSULTING GROUP (SEE SHEET 11 OF
SUNIGA DRIVE IMPROVEMENTS PREPARED
BY INTERWEST CONSULTING GROUP),.
PROPOSED SIDEWALK
BY INTERWEST
CONSULTING GROUP
PROPOSED TRAFFIC
LIGHT BY INTERWEST
CONSULTING GROUP
(TYP.)
UTILITY & DRAINAGE
EASMENT (SEE PLAT)
PROPOSED 15'
UTILITY EASEMENT
PROPOSED 20'
EMERGENCY
ACCESS EASEMENT
22' UTILITY EASEMENT
PER 1ST STOP PLAZA
15' DRAINAGE
EASEMENT
(RECEPTION NO.
199400063870)
70.1
2FL
70.9
2
FL
70.8
0
FL
70.
9
4
FL
71.8
0
(71
.
9
3
)
71.7
3
FL
71.5
8
71.3
7
(71
.
9
7
)
(71
.
9
1
)
0.5%0.5%0.5%
0.6%0.6%
0.5%
0.
8
%
0.
5
%
1.
0
%
2.0%
1.5%
2.5%
2.3
%
2.5%
2.
8
%
1.
9
%
3.
5
%
2.1
%2.1
%
2.1
%
2.0%
3.8
%
3.1
%
3.3%
2.1%
2.0%
2.1%
2.7%
3.9
%
4.0%
4:
1
4:
1 4:1
6:1
3:1
6:1
6:1
6:1
5:
1
2.0%
4:
1
4:
1
2.
2
%
2.1
%
0.5%
2.0%1.5%
67.6
5
FL
67.2
1
FL
PROPOSED MIN. 6" DEEP
(ACTUAL DEPTH VARIES)
SWALE WITH 4:1 SIDE SLOPES
6:1
4:1
4:1
66.90
FL
2.
0
%
(66
.
4
3
)
FL
MATCH INTO
EXISTING GRATE
1.2%
70.6
6
HP 2.
6
%
68.0
6FL
71.09
FL
71.1
6
FL
71.1
4
FL
70.9
4FL
71.3
8HP
2.0%
2.1%
70.65
SEE DETAIL ON
THIS SHEET
3.
9
%
5.
7
%
9.2
%
2.8%
EX. STORM MH
SAWCUT LINE
SAWCUT LINE
70.7
5
FL
71.2
6
HP
(70
.
4
4
)
(70
.
4
2
)
20' x 5' TRM
RUNDOWN
7' x 5' TRM
RUNDOWN
LOT 2 1ST STOP PLAZA
SECOND FILING
LOT 1 1ST STOP PLAZA
SECOND FILING
PROPOSED UTILITY EASEMENT
CC
69.9
5FL
70
.
6
7
FL
69.7
6
FL
2.4%
2.8
%
2.4%
3.5%
STORM MH B1
STA 10+00.00
RIM: 4969.66
INV IN: 4963.85 18" RCP
INV IN: 4962.85 30" RCP
INV OUT: 4962.85 30" RCP
33.8
6
L
F
1
8
"
R
C
P
@
2
.
0
0
%
STORM INLET B2
STA 10+33.86
GRATE: 4969.72
INV OUT: 4964.53 18" RCP
69
.
7
2
LP
1.2%
4.4%
4.4%
0.5%
69.9
8FL
(70
.
0
4
)
(70
.
1
0
)
(SEE NOTE 11)
T
1.2%
9.2
%
70.7
5
FL
71.2
6
HP
(70
.
4
4
)
(70
.
4
2
)
Sheet
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of 10
PROPOSED CONCRETE FLATWORK
PROPOSED INFLOW CURB & GUTTER
PROPOSED INFRASTRUCTURE BY OTHERS
PROPOSED 8' CURB AND GUTTER TRANSITION
C4.0
GR
A
D
I
N
G
P
L
A
N
6
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what's below.
before you dig.Call
R
LEGEND:
( IN FEET )
0
1 INCH = 20 FEET
20 20 40 60
1
MATCH INTO PROPOSED ENTRANCE DESIGNED BY INTERWEST CONSULTING GROUP
(SEE SHEET 6 OF SUNIGA DRIVE IMPROVEMENTS PREPARED BY INTERWEST
CONSULTING GROUP).
2 MATCH INTO EXISTING CURB AND GUTTER
3 PRESERVE AND PROTECT EXISTING TREE
KEY NOTES:
PROPERTY BOUNDARY
EXISTING RIGHT-OF-WAY
EXISTING EASEMENTS
NOTES:
1.EXISTING UNDERGROUND AND OVERHEAD PUBLIC AND PRIVATE UTILITIES AS SHOWN
ARE INDICATED ACCORDING TO THE BEST INFORMATION AVAILABLE TO THE
ENGINEER. THE ENGINEER DOES NOT GUARANTEE THE ACCURACY OF SUCH
INFORMATION. EXISTING UTILITY MAINS AND SERVICES MAY NOT BE STRAIGHT LINES
OR AS INDICATED ON THESE DRAWINGS. THE CONTRACTOR SHALL BE RESPONSIBLE
TO CALL ALL UTILITY COMPANIES (PUBLIC AND PRIVATE) PRIOR TO ANY
CONSTRUCTION TO VERIFY EXACT UTILITY LOCATIONS.
2.SPOT ELEVATIONS SHOWN ARE FLOWLINE, EDGE OF PAVEMENT, OR EDGE OF WALK
UNLESS NOTED OTHERWISE.
3.ALL DISTURBED AREAS SHALL BE REVEGETATED PER THE APPROVED LANDSCAPE
PLANS.
4.ALL SOIL (NOT MULCH) IN LANDSCAPE BEDS ADJACENT TO BUILDINGS SHALL BE
PLACED SUCH THAT THE TOP OF SOIL IS AT THE SAME ELEVATION AS ADJACENT
SIDEWALK TO ALLOW FOR PROPER DRAINAGE.ALL DIMENSIONS AND LINE AND CURVE
INFORMATION ARE MEASURED TO CURB FLOW LINE OR EDGE OF PAVEMENT UNLESS
OTHERWISE NOTED.
5.ALL SYMBOLS ARE ONLY GRAPHICALLY REPRESENTED AND ARE NOT TO SCALE.
6.LIMITS OF STREET CUT ARE APPROXIMATE. FINAL LIMITS ARE TO BE DETERMINED IN
THE FIELD BY THE CITY ENGINEERING INSPECTOR. ALL REPAIRS TO BE IN
ACCORDANCE WITH CITY STREET REPAIR STANDARDS.
7.LIMITS OF CONCRETE REPAIRS TO BE DETERMINED IN THE FIELD BY THE CITY
ENGINEERING INSPECTOR. CONCRETE TO BE REMOVED JOINT TO JOINT.
8.STORM SEWER MAINS SHOWN ON THESE DRAWINGS ARE HIGH DENSITY
POLYETHYLENE (HDPE) AND SHALL BE WATERTIGHT ADS N-12 OR APPROVED EQUAL.
STORM SEWER MAINS SHOWN ON THESE DRAWINGS AS REINFORCED CONCRETE
PIPE (RCP) SHALL BE CLASS III RCP.
9.CONTRACTOR SHALL COORDINATE ALL CONSTRUCTION ITEMS IMPACTING ADJACENT
PROPERTIES WITH THE PROPERTY OWNERS PRIOR TO BEGINNING ANY
CONSTRUCTION ACTIVITIES.
10.ANY DAMAGED CURB, GUTTER, AND SIDEWALK EXISTING PRIOR TO CONSTRUCTION,
AS WELL AS STREETS, SIDEWALKS, CURBS AND GUTTERS, DESTROYED, DAMAGED
OR REMOVED DUE TO CONSTRUCTION OF THIS PROJECT, SHALL BE REPLACED OR
RESTORED TO CITY OF FORT COLLINS STANDARDS AT THE DEVELOPER'S EXPENSE
PRIOR TO THE ACCEPTANCE OF COMPLETED IMPROVEMENTS AND/OR PRIOR TO THE
ISSUANCE OF THE FIRST CERTIFICATE OF OCCUPANCY.
11.IMPROVEMENTS SHOWN FOR SUNIGA DRIVE ARE SHOWN FOR REFERENCE ONLY.
CONTRACTOR TO VERIFY COORDINATION WITH FINAL SUNIGA PLANS AND
IMPROVEMENTS PRIOR TO STARTING CONSTRUCTION.
12.EASEMENTS SHOWN FOR REFERENCE. SEE 1ST STOP PLAZA SECOND FILING PLAT
FOR DIMENSIONS AND LOCATIONS OF EXISTING, PROPOSED, AND VACATED
EASEMENTS.
PROPOSED OUTFALL CURB & GUTTER
T
77.71PROPOSED SPOT ELEVATION
HP - HIGH POINT
LP - LOW POINT
TC - TOP OF CONCRETE
FL - FLOWLINE OF CURB
TBC - TOP BACK OF CURB
TW - TOP OF WALL
BW - BOTTOM OF WALL
GRD - GROUND ELEVATION AT
EXTERIOR WALL, DOOR, OR RAISED
PLATFORM
EXISTING MAJOR CONTOUR
EXISTING MINOR CONTOUR
PROPOSED STORM SEWER
PROPOSED STORM INLET
(77.90)
EXISTING SPOT ELEVATION
PROPOSED GRADE 1.8%
EXISTING GRADE (1.8%)
PROPOSED MAJOR CONTOUR
PROPOSED MINOR CONTOUR
STRUCTURE NAME TYPE
STORM MH B1 (PER INTERWEST)
STORM INLET B2 24" NYLOPLAST INLET WITH 2'x3'
CURB INLET WITH DIAGONAL GRATE
INLET/MANHOLE SCHEDULE:
DETAIL
1" = 10'
5/10/19
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
I, FREDERICK WEGERT, CERTIFY
ALL PUBLIC WATER,
WASTEWATER, AND
STORMWATER SYSTEM
IMPROVEMENTS SHOWN
HEREIN, INCLUDING ANY NOTED
CHANGES OR REVISIONS, ARE IN
GENERAL CONFORMANCE WITH
THE DESIGN/CONSTRUCTION
DOCUMENTS, PURSUANT TO
THIS RECORD DRAWING COPY
OF THE FINAL UTILITY PLANS.
11/20/19