HomeMy WebLinkAboutLot Certifications - 06/21/2019
Drainage Certification Letter June 19, 2019
Centre of Advanced Technologies 23rd Filing, Lot 2 Page 1 of 1
June 19, 2019
Mr. Dan Mogen
City of Fort Collins
700 Wood Street
Fort Collins, CO 80522
RE: Grading Certification for Centre of Advanced Technologies 23rd, Lot 2
Fort Collins, Colorado
Dear Mr. Mogen:
This drainage certification letter is provided to verify as-constructed conditions for Centre of
Advanced Technologies 23rd, Lot 2. Northern Engineering completed survey work November
2016 to verify general compliance with the Final Utility Plans for Centre for Advanced
Technology 23rd Filing, Lot 2, dated June 6, 17, 2015, including revised drawings dated 5/20/2016
(Minor Amendment No. MA160023) by Northern Engineering.
Construction activities for this project was completed on November 2016, and this site
certification was originally submitted to the City on January 8, 2017. The attached certification
was revised per recent comments received from the City.
Included in this drainage certification submittal are the following:
Appendix A – Updated 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 rain garden calculations.
Appendix D - As-constructed record drawings for Grading and Storm Drain Plan and Profile
Sheets.
Based on the calculations shown in Appendix C, the as-built water quality pond volumes are in
Table 1. The as-built rain garden 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)
Rain Garden 1,152 1,171
Drainage Certification Letter June 19, 2019
Centre of Advanced Technologies 23rd Filing, Lot 2 Page 2 of 1
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 III.B.3: Northern Engineering did not observe construction. Northern Engineering was
unable to verify the specific joint types or construction methods used during construction.
According to the contractor, the pipes and inlets were installed per the manufacturer’s
recommendations.
Please feel free to contact me with any questions you may have.
Northern Engineering Services, Inc.
Frederick S. Wegert, PE
Project Engineer
6/19/19
Appendix A
Overall Site and Drainage Certification Form
12/15 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.)
•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
Centre of Advanced Technologies 23rd, Lot 2
June 6, 2019
B1504153
N/A
N/A
N/A
Yes
Yes
N/A
12/15 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.
•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
12/15 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
Yes
Yes
Yes
12/15 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.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N/A
N/A
N/A
N/A
N/A
N/A
N/A
12/15 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.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
12/15 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
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
12/15 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
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Appendix B
During Construction Inspection Checklist
12/15 Page 1
DURING CONSTRUCTION INSPECTION CHECKLIST
To be completed by Construction Superintendent
This checklist is to be completed during construction and included with the Overall Site and Drainage Certification.
•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.
I.Compaction
A.All berms and embankments meet the compaction requirements as specified in the project geotechnical report or comply with the
City’s standard, which is “soils should be compacted within a moisture content range of 2% below to 2% above optimum moisture content
and compacted to 95% of the Maximum Standard Proctor Density (ASTM D698).” Compaction requires verification during construction.
Provide testing log from contractor/engineer.
II.Storm Drain Pipe Installation Requirements
A.The pipe trenches have been compacted in accordance with Section 02225-3.07.A.1. of the Fort Collins Development Construction
Standards (e.g., the trenches in the roadways are to be 95% of maximum density and all other areas are to be at 90%, both in accordance
with ASTM D698).
III. Riprap - FCSCM Vol.1, Ch.7, Sec.4.4.4.3
A.The riprap bedding is a granular bedding of the gradation and thickness indicated on the approved construction plans.
B.A filter fabric was installed instead of granular bedding and is the material shown on the approved construction plans or was an
approved equal. Provide documentation for an approved equal.
C.The riprap is the gradation shown on the approved construction plans with a D50 of .
D.The riprap thickness is as shown on the approved construction plans and extends to the horizontal limits shown.
E.The riprap is buried to the depth indicated on the approved construction plans. (A minimum of 6 inches of soil is required.)
IV. Permanent Erosion Control Fabric - FCSCM Vol.1, Ch.7
A.All fabric was installed per manufacturer’s specifications.
V. Certification of Other Permanent BMPs - FCSCM Vol.2, Ch.8, Sec.2 & FCSCM Vol.2, Ch.12
A.All cut-off walls have been installed in accordance with the approved construction plans. (Cut-off walls are required for irrigation
ditch crossings of storm drain pipes and at the end of flared end sections.)
2
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
12/15 Page 2
Permeable Interlocking Concrete Pavers
Post-excavation infiltration rates are consistent with design
infiltration capacity (for “full or partial infiltration” designs)
Impermeable liner meets design specifications
Impermeable liner attached to concrete perimeter wall
Impermeable liner is not exposed
Any penetrations of the impermeable liner have been sealed
and checked for water-tightness.
Meets specifications for:
-Dimensions
-Reinforcement
-Footings
Underdrain pipe is per design specifications
At least one cleanout is provided per underdrain lateral
Cleanout pipe is not perforated
Cleanout covers are installed and watertight
Underdrain is NOT wrapped in geotextile fabric
Underdrain orifice plate installed at outlet structure
Underdrain integrity tested after backfilling using TV and/or
water test
Base coarse (e.g., #2/4) has 90% fractured faces
Bedding coarse (e.g., #89) is thoroughly washed
Sub-base materials are installed and compacted according to
manufacturer’s specifications
PICP area is protected from construction site sediment,
including runoff from the upstream catchment and
Close Out
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
Water test.
Monitoring well.
Liner Underdrain w/ Liner Beneath
Monitoring Well & Underdrain
with Liner Beneath Underdrain w/ Liner Beneath
No. Sub-Base Installation at 6" Deep No. 2 Sub-Base Installation Continued
No. 2 Sub-Base Installation Continued No. 2 Sub-Base Installation Continued
No. 2 Sub-Base Compaction No. 2 Sub-Base Compaction Near Complete
No. 57 Base Installation at 4" Deep No. 89 Bedding Installation at 2" Deep
No. 89 Bedding Continued,
Prepping for Paver Install Laying Pavers
12/15 Page 3
Bioretention Cells
Heavy equipment did not travel over bioretention cell during
excavation
Bottom of cell was “ripped” after excavation Photograph before/after “ripping”
Bottom of cell is flat and level Photograph
Excavated area is protected/surrounded by sediment/runoff
control BMPs during construction
Photograph
Overflow inlet elevation is set above bioretention media per
plan (typically 12 inches)
Overflow inlet invert elevation is at least 3 inches below
containment wall/berm (to direct overflow into inlet)
Measure/record distance between inlet and top of
containment wall/berm
Upstream catchment drains to inlet
Forebay is installed according to design specifications
Forebay has flat, concrete bottom
Outlet structure/overflow elevation is confirmed Measure/record distance from overflow to top of media
filter
Impermeable liner meets design specifications
Impermeable liner attached to concrete perimeter wall
Impermeable liner is not exposed
Underdrain pipe is per design specifications
At least one cleanout is provided per underdrain lateral
Cleanout pipe is not perforated
Cleanout covers are installed and watertight
Underdrain is NOT wrapped in geotextile fabric
Underdrain orifice plate installed at outlet structure
Underdrain integrity tested after backfilling using TV and/or
water test
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
See photo "Bottom of Cell is Flat and Level"
See photo "Excavated Area is surrounded by existing landscpe
and new retaining wall, inlet surrounded by BMP's during
construction."
See photo "Bottom of Cell Before Ripping"
& "Bottom of Cell After Ripping"
14 inches
12 inches
Impermeable liner attached to concrete block retaining wall.
Water test.
12/15 Page 4
Filter Media
Filter media composition is per design specifications
Filter media was “machine mixed” by supplier prior to delivery
Filter media installed flat and level
Other Structural Components
Containment wall/berm is continuous and level
Landscaping
Final landscaping does NOT include sod
Final landscaping (wood/rock mulch) is flat and level
Vegetation is planted according to landscape design
specifications
Verify that weed barrier is not installed
Temporary irrigation installed If N/A, then verify that permanent irrigation is installed to
establish/maintain vegetation
Close Out
Upstream catchment stabilized prior to diverting runoff into
bioretention cell
Signature:
Name:
Title:
Email:
Phone:
Company:
Address:
4
4
4
4
4
4
4
4
4
4
Mike McCartney
Mike McCartney
Field Engineer
mike.mccartney@brinkmanpartners.com
970-999-2929
Brinkman Construction
3528 Precision Drive, Suite 100
Fort Collins, CO 80528
Bio Retention Cells - Excavation
"Bottom of Cell Before Ripping""Bottom of Cell After Ripping" &
"Bottom of Cell is Flat and Level"
(Note that retaining wall subgrade
and base course is level)
"Excavated Area
is surrounded by
existing landscpe
and new retaining
wall, inlet
surrounded by
BMP's during
construction."
10" Gravel Layer Meeting CDOT #4 Coarse
Aggregate Specification, w/ Underdrain
10" Gravel Layer Complete,
Underdrain Burried, Cleanout
Capped/Sealed Ready for Pea Gravel
Excavate for Soil & Rip Rap
Installing Granular Type I & Type II
Bedding per Detail 8 on Page C6.02
Installing Rip Rap
Rip Rap Installation Complete
Rip Rap Installation
Stabilization Top Soiled Installed w/
Rip Rap Underneath (temporarily
left exposed rip rap to show layers).
10" Gravel Layer Installed
6" of Pea Gravel w/ 10" Gravel Layer Underneath
12" of Bio Retention Sand Media
w/ 6" of Pea Gravel Underneath
Installation of Bio Retention
Sand Media Continued
Bioretention Pond Complete w/
Landscape and Temporary Irrigation
Bioretention Pond Complete. Overflow
Inlet 12" Above Bio Retention Sand Media
Bioretention Pond Complete. Two Flared
Ends and Water Tight Cleanout Shown.
Appendix C
Water Quality Capture Volume
Sheet 1 of 2
Designer:
Company:
Date:
Project:
Location:
1. Basin Storage Volume
A) Effective Imperviousness of Tributary Area, Ia Ia =100.0 %
(100% if all paved and roofed areas upstream of rain garden)
B) Tributary Area's Imperviousness Ratio (i = Ia/100)i = 1.000
C) Water Quality Capture Volume (WQCV) for a 12-hour Drain Time WQCV = 0.40 watershed inches
(WQCV= 0.8 * (0.91* i3 - 1.19 * i2 + 0.78 * i)
D) Contributing Watershed Area (including rain garden area) Area = 34,574 sq ft
E) Water Quality Capture Volume (WQCV) Design Volume VWQCV =1,152 cu ft
Vol = (WQCV / 12) * Area
F) For Watersheds Outside of the Denver Region, Depth of d6 = in
Average Runoff Producing Storm
G) For Watersheds Outside of the Denver Region, VWQCV OTHER =cu ft
Water Quality Capture Volume (WQCV) Design Volume
H) User Input of Water Quality Capture Volume (WQCV) Design Volume VWQCV USER =cu ft
(Only if a different WQCV Design Volume is desired)
2. Basin Geometry
A) WQCV Depth (12-inch maximum)DWQCV =12 in
B) Rain Garden Side Slopes (Z = 4 min., horiz. dist per unit vertical) Z = 4.00 ft / ft
(Use "0" if rain garden has vertical walls)
C) Mimimum Flat Surface Area AMin =768 sq ft
D) Actual Flat Surface Area AActual =996 sq ft
E) Area at Design Depth (Top Surface Area)ATop =1345 sq ft
F) Rain Garden Total Volume VT=1,171 cu ft
(VT= ((ATop + AActual) / 2) * Depth)
3. Growing Media
4. Underdrain System
A) Are underdrains provided?
B) Underdrain system orifice diameter for 12 hour drain time
i) Distance From Lowest Elevation of the Storage y =ft
Volume to the Center of the Orifice
ii) Volume to Drain in 12 Hours Vol12 =N/A cu ft
iii) Orifice Diameter, 3/8" Minimum DO =N/A in
Design Procedure Form: Rain Garden (RG)
C. Snowdon
Northern Engineering
March 28, 2017
CAT 23rd, Lot 2 Minor Amendment
Pond A
Choose One
Choose One
18" Rain Garden Growing Media
Other (Explain):
YES
NO
232-033 Rain Garden (75%) UD-BMP_v3.02.xls, RG 3/28/2017, 10:51 AM
Sheet 2 of 2
Designer:
Company:
Date:
Project:
Location:
5. Impermeable Geomembrane Liner and Geotextile Separator Fabric
A) Is an impermeable liner provided due to proximity
of structures or groundwater contamination?
6. Inlet / Outlet Control
A) Inlet Control
7. Vegetation
8. Irrigation
A) Will the rain garden be irrigated?
Notes:
March 28, 2017
CAT 23rd, Lot 2 Minor Amendment
Pond A
Design Procedure Form: Rain Garden (RG)
C. Snowdon
Northern Engineering
Choose One
Choose One
Choose One
Sheet Flow- No Energy Dissipation Required
Concentrated Flow- Energy Dissipation Provided
Plantings
Seed (Plan for frequent weed control)
Sand Grown or Other High Infiltration Sod
Choose One
YES
NO
YES
NO
232-033 Rain Garden (75%) UD-BMP_v3.02.xls, RG 3/28/2017, 10:51 AM
Project Title Date:
Project Number Calcs By:
Client
Pond Designation
Invert Elevation
Water Quality Volume
100-yr Detention Volume
Total Pond Volume
D = Depth between contours (ft.)
A1 = Surface Area lower contour (ft2)
A2 = Surface Area upper contour (ft2)
5005.30 1005.10 0.00 0.00 0.00 0.0000
5005.40 1035.76 0.10 102.04 102.04 0.0023
5005.50 1066.40 0.10 105.10 207.14 0.0048
5005.60 1098.34 0.10 108.23 315.38 0.0072
5005.70 1131.57 0.10 111.49 426.87 0.0098
5005.80 1166.10 0.10 114.88 541.75 0.0124
5005.90 1201.92 0.10 118.40 660.14 0.0152
5006.00 1238.95 0.10 122.04 782.18 0.0180
5006.10 1277.14 0.10 125.80 907.98 0.0208
5006.20 1316.49 0.10 129.68 1037.66 0.0238
5006.30 1359.93 0.10 133.82 1171.47 0.0269 WQCV
Overall Detention
Elevation Depth Volume
WQCV 5006.29 0.99 0.0264
100-yr Detention 5006.29 0.99 0.0264
Overall Detention 5006.29 0.99 0.0264
CSURF
CAT 23rd Filing, Lot 2 - As-Built March 24, 2017
232-033 C. Snowdon
Rain Garden
5005.30 ft
0.0264 ac-ft
0.0264 ac-ft
0.0264 ac-ft
Rain Garden Volume
Elevation
(ft)
Surface
Area (ft2)
Incremental
Depth (ft)
Incremental
Vol. (ft3)
Total Vol.
(ft3)
Total Vol.
(ac-ft)
Calc.
Depths
()
3
**2121AAAADV++=
Figure 1: Grading along the northern side of
the building.
Figure 2: Grading along the east side of the
building.
Figure 3: Grading along the western side of
the parking lot.
Figure 4: Area Inlet B2 at the south end of
the western swale.
Figure 1: Curb cut southwest corner of the
parking lot @ Design Point b2.
Figure 2: Curb cut south side of the main
entrance @ Design Point os1
Figure 3: Highhood Setting Inlet A2
Figure 1: Curb cut southwest corner of the
parking lot @ Design Point b2.
Figure 1: Pavers with fine
aggregate fill material.
Figure 2: Northern Parking
Lot.
Figure 3: Inlet C3-1
Figure 2: Raingarden
Figure 2: Existing Inlet A6-1 Figure 3: Existing Inlet A6-1
Figure 1: Dome Grate Inlet C4. Figure 2: Dome Grate Inlet C5. Figure 3: Dome Grate Inlet C7.
Figure 5: Dome Grate Inlet C2-6. Figure 6: Dome Grate Inlet C2-8. Figure 4: Dome Grate Inlet C2-5.
Figure 7: Flat Grate Inlet C2-9. Figure 8: Dome Grate Inlet C2-10. Figure 9: Dome Grate Inlet C2.
Appendix D
Record Drawings
2
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
VAULT
ELEC
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
VAULT
ELEC
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
E
E
E
E
E
E
E
E
E
E
E
E
G
G
G
G
G
G
G
G
G
G
G
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
E
E
E
E
E
E
E
E
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
G
S
F
W
UD
UD
UD
G
G
E
E
E
E
E
E
E
ST
ST
SS
SS
W
12"
W
12
"
W
12"
W
12"
W
12"
W
12"
W
12"
W
12"
W
12"
W
12"
W
12"
W
12"
W
12"
W
W
W
W
W
W
W
S
UD
UD
UD
UD
UD
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T/
C
E/T/
C
E
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS SS
SS
E/T/C
E/T/C
E/T/C
E/T/C
E/T/C
E/T/
C
E/T/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T/
C
W
W
W
W
W
W
W
W
W
W
W
W
W
W W
E
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
FDC
UD
UD
AD
WWF
AD AD
EXISTING 8" PVC
UNDERDRAIN
EXISTING 8" PVC
SANITARY SEWER
EXISTING
8" PVC WATER
EXISTING FH
70'
R
O
W
48' -
EXISTING 9'
UTILITY EASEMENT
21± LF
1-1/2" WATER SERVICE
2" WATER SERVICE
6" FIRE SERVICE
APPROXIMATE
ASPHALT PATCHING
LIMITS (SEE NOTE 7)
REPLACE ALL DAMAGED
CURB & GUTTER
LOT 1
EXMH A2-1
INV. IN=5008.92 (SE)
INV. OUT=5007.92 (NE)
FG=5017.13
4"x4" TEE 2
(REFER TO PLUMBING
PLANS FOR CONTINUATION)
INV.=5012.22
FG=5016.96
22-1/2° BEND 1
INV.=5011.41
FG=5016.09
27.14 LF 4" PVC @ 3.00%
83
.
1
5
L
F
4
"
P
V
C
@
3
.
0
0
%
CEN
T
R
E
A
V
E
N
U
E
RO
L
L
A
N
D
M
O
O
R
E
D
R
I
V
E
PER
E
N
N
I
A
L
L
A
N
E
LOT 1
LOT 2
INSTALL 8"x6" TAPPING SADDLE
WITH 6" G.V. & T.B.
INSTALL 1-1/2" SERVICE
35.
2
4
L
F
4" P
V
C
@ 3
.
0
0
%
SANITARY SERVICE
INV. OUT=5013.28 (NE)
FG=5019.80
ELECTRICAL
SERVICE
(SEE NOTE 10)
EXISTING FH
APPROXIMATE
LIMITS OF CONCRETE
TO BE REMOVED
EXISTING
ELECTRIC
VAULT
PROPOSED
2'x2' NYLOPLAST
COMBINATION
INLET
PROPOSED
2'x2' NYLOPLAST
COMBINATION
INLET
6" PERFORATED
UNDER DRAIN
PROPOSED
DRAIN BASIN
PROPOSED
2'x2' AREA INLET
STORM LINE B
SEE SHEET C3.01
STORM LINE A
SEE SHEET C3.01
STORM LINE C
SEE SHEET C3.01
CLEANOUT
(TYPICAL)
PROPOSED
ELECTRIC
TRANSFORMER
PROPOSED
ELECTRICAL GEAR
PROPOSED
GAS METER
74± LF
6" FIRE LINE
6± LF
6" FIRE LINE
8± LF
6" FIRE LINE
65± LF
2" WATER SERVICE
3± LF
2" WATER SERVICE
7± LF
2" WATER SERVICE
PROPOSED
DRAIN BASIN
4' CONCRETE PAN
CURB CUT
CURB CUTS
EXISTING
AREA DRAIN
EXISTING 12" WATER
EXISTING SANITARY
EXISTING STORM
EXISTING 8" WATER
CORE DRILL NEW
SANITARY SEWER SERVICE
INTO EXISTING MANHOLE
EXISTING
ELECTRIC
VAULT
PROPOSED
COOLING TOWER
PROPOSED
DRAIN BASIN
APPROXIMATE LOCATION OF
EXISTING GAS MAIN
(SEE NOTE 10)
INSTALL 1-1/2" TO 2"
REDUCER 5.0' PAST
THE METER
SAND & OIL
SEPARATOR
(SEE PLUMBING
PLANS FOR DETAILS)
EXISTING EASEMENT
VACATED BY
SEPARATE DOCUMENT
(CROSS HATCHED)
6" PERFORATED
UNDER DRAIN
S
E
E
E
E
E
E
E
UD
UD E
GF
E
S
G
UD
UD
W
19± LF
2" WATER SERVICE
Sheet
Of 17 Sheets
CE
N
T
R
E
F
O
R
A
D
V
A
N
C
E
D
T
E
C
H
N
O
L
O
G
Y
20
0
S
o
u
t
h
C
o
l
l
e
g
e
A
v
e
n
u
e
,
S
u
i
t
e
0
1
0
Fo
r
t
C
o
l
l
i
n
s
,
C
o
l
o
r
a
d
o
8
0
5
2
4
E
N
G
I
N
E
E
R
N
G
I
E
H
T
R
O
N
R
N
PH
O
N
E
:
9
7
0
.
2
2
1
.
4
1
5
8
ww
w
.
n
o
r
t
h
e
r
n
e
n
g
i
n
e
e
r
i
n
g
.
c
o
m
23
R
D
F
I
L
I
N
G
-
L
O
T
2
06.17.15
C3.00
UT
I
L
I
T
Y
P
L
A
N
NORTH
NOTES:
CONTROL
IRR
UD
UD
LEGEND:
W
G
T
E/T/C
SS
E
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
MI
N
O
R
A
M
E
N
D
M
E
N
T
(
M
A
1
6
0
0
2
3
)
CN
S
05
.
2
0
.
1
6
1
11
1 REC
O
R
D
D
R
A
W
I
N
G
2
WA
T
E
R
L
I
N
E
A
S
-
B
U
I
L
T
S
MC
R
06
.
2
1
.
1
6
X
X
X
X
X
X
X
X
X
X
X
X
S
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E
E
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E
E
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
SS
SS
SS
SS
SS
SS
SS
SS
SS
E/T/C
E/T/C
E/T/
C
E/T/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
E/T
/
C
W
W
W
W
W
W
W
W
W
W
W
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
UD
FDC
WWF
S
E
E
E
E
E
E
E
E
E
E E
UD
UD
UD
E
GF
E
W
S
G
UD
UD
UD
UD
UD
UD
UD
12
"
W
12"
W
12"
W
12"
W
12"
W
12"
W
12"
W
12"
W
12"
W
12"
W
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
VAULT
ELEC
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
E
E
E
E
E
E
E
E
E
E
E
E
E
E
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
E
E
E
E
E
E
E
E
E
E
E
E
E
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
E
LOT 2
CEN
T
R
E
A
V
E
N
U
E
RO
L
L
A
N
D
M
O
O
R
E
D
R
I
V
E
PER
E
N
N
I
A
L
L
A
N
E
56.
5
3
L
F
1
2
"
H
D
P
E
@
2
.
8
5
%
60.6
2
L
F
1
2
"
H
D
P
E
@
0
.
5
0
%
44.
6
9
L
F
1
2
"
H
D
P
E
@
0
.
5
0
%
3.14 LF 12" HDPE @ 3.91%
38.0
4
L
F
8
"
H
D
P
E
@
1
.
1
8
%
6.18 LF
8" HDPE
@ 1.00%
25.4
2
L
F
8" H
D
P
E
@ 1.
0
0
%
4.13 LF
8" HDPE
@ 1.00%
1.67 LF
4" PVC
@ 2.00%
20.
2
2
L
F
4" P
V
C
@ 2
.
0
0
%
2.89 LF
4" PVC
@ 2.00%
7.35 LF
12" HDPE
@ 0.70%
21.0
6
L
F
12"
H
D
P
E
@ 0.
7
0
%
19.8
0
L
F
12"
H
D
P
E
@ 0.
7
0
%
32.1
2
L
F
8
"
H
D
P
E
@
0
.
7
0
%
21.9
1
L
F
8" H
D
P
E
@ 0.
7
2
%
8.62 LF
4" PVC
@ 4.00%
8.87 LF
4" PVC
@ 4.00%
3.06 LF 12" HDPE @ 3.91%
70
L
F
6
"
P
E
R
F
.
P
V
C
@
1
.
0
0
%
PERMEABLE
PAVERS
4" CONCRETE PAN
CURB CUT
CURB CUT
LANDSCAPE
WALLS
11.42 LF
12" HDPE
@ 0.60%
13.32 LF
12" HDPE
@ 0.59%
14.
3
1
L
F
8" H
D
P
E
@ 4
.
0
0
%
LANDSCAPE
WALL
STRUCTURAL
WALL
22.
3
7
L
F
8" H
D
P
E
@ 1
.
0
0
%
7.21 LF
4" PVC
@ 3.61%
61.
7
5
L
F
8
"
H
D
P
E
@
1
.
0
0
%
17.2
4
L
F
8" H
D
P
E
@ 1.
0
0
%
9.19 LF
8" HDPE
@ 1.00%
9.40 LF
8" HDPE
@ 1.00%
CURB CUTS
PROPOSED
DOWNSPOUT
PROPOSED
DOWNSPOUT
BURIED RIPRAP
(SEE DETAIL 8
ON SHEET C6.02)
BURIED RIPRAP
(SEE DETAIL 8
ON SHEET C6.02)
BURIED RIPRAP
(SEE DETAIL 8
ON SHEET C6.02)
73.
5
1
L
F
6
"
P
V
C
@
0
.
5
0
%
18
.
1
2
L
F
12
"
H
D
P
E
@ 3
.
9
1
%
43.
9
6
L
F
1
2
"
H
D
P
E
@
3
.
9
1
%
18.66
L
F
12" H
D
P
E
@ 3.9
1
%
38.
0
0
L
F
1
2
"
H
D
P
E
@
3
.
9
1
%
8.75 LF
12" HDPE
@ 0.70%
4.52 LF 12" HDPE @ 0.70%
47.1
5
L
F
1
2
"
H
D
P
E
@
0
.
7
0
%
7.18 LF 8" HDPE @ 1.00%
INLET B2
(2'x2' AREA INLET)
INV. OUT=5009.31 (NE)
FG=5012.16
FES B1
INV. IN=5007.70 (SW)
FG=5007.70
INLET A2
(2x2 NYLOPLAST
COMBINATION INLET
HIGH HOOD SETTING)
INV. OUT=5008.03 (NW)
FG=5012.16
FES A1
INV. IN=5007.72 (SE)
FG=5007.72
90° BEND- C9
(w/ CLEANOUT)
INV.=5029.50
FG=5032.95
90° BEND - C11
(w/ CLEANOUT
& 8"-4" REDUCER)
INV: 5030.15
FG=5032.62
DOWNSPOUT
CONNECTION
INV.= 5030.35
FG=5032.65
CLEANOUT C3-2
INV. OUT=5028.57 (NW)
FG=5030.91
PLUMBING
CONNECTION
INV.= 5029.64
FG=5033.13
8"x4" TEE - C8
INV.=5029.24
FG=5032.81
10" SOLID GRATE - C3
(w/ 18" DRAIN BASIN)
INV. IN=5028.37 (SE)
INV. IN=5025.04 (SW)
INV. OUT=5017.40 (NE)
FG=5031.11
DOWNSPOUT
CONNECTION
INV.= 5029.15
FG=5032.76
8"x4" TEE - C6
INV.=5029.09
FG=5031.80
INLET C3-1
(2x2 NYLOPLAST
COMBINATION INLET)
INV. IN=5027.87 (SE)
INV. OUT=5027.37 (NE)
FG=5029.78
8" DOME GRATE - C2-6
(w/ 12" DRAIN BASIN)
INV.=5015.98
FG=5018.52
8" DOME GRATE - C2
(w/ 18" DRAIN BASIN)
INV.=5014.85
FG=5017.82
8" DOME GRATE - C2-5
(w/ 12" DRAIN BASIN)
INV.=5015.76
FG=5018.55
12"x4" TEE - C2-2
INV.=5015.47
FG=5019.09
FES C1
INV. IN=5014.63 (SW)
FG=5014.63
PLUMBING
CONNECTION
INV.= 5015.82
FG=5019.28
12"x4" TEE - C2-1
INV.=5015.32
FG=5018.45
DOWNSPOUT
CONNECTION
INV.= 5015.66
FG=5019.27
12" 22-1/2° BEND C2-4
INV.=5015.61
FG=5019.56
12"x4" TEE - C2-3
INV.=5015.69
FG=5019.68
8" DOME GRATE - C2-8
(w/ 12" DRAIN BASIN)
INV.=5016.14
FG=5019.07
8" VERTICAL TEE - C2-9
(w/ 12" DRAIN BASIN)
INV. IN=5016.71 (SW)
INV. OUT=5016.71 (NE)
FG=5019.23
10" DOME GRATE - C2-10
(w/ 10" INLINE DRAIN BASIN)
INV. OUT=5017.01 (N)
FG=5028.19
8"x4" TEE - C10
INV.=5029.54
FG=5032.95 PLUMBING
CONNECTION
INV.= 5029.80
FG=5033.12
8" DOME GRATE - C4
(w/ 10" DRAIN BASIN)
INV.=5028.82
FG=5031.69
8" DOME GRATE - C5
(w/ 10" DRAIN BASIN)
INV.=5028.99
FG=5031.77
8" DOME GRATE - C7
(w/ 10" DRAIN BASIN)
INV.=5029.15
FG=5031.83
EXISTING INLET A6-1
INV. IN=5003.02 (SW)
INV. OUT=5002.55 (NE)
RIM=5006.65
CLEANOUT A6-1a
INV. OUT=5003.39 (NE)
FG=5005.65
12" 22-1/2° BEND ADD C2a
INV: 5014.97
FG=5018.38
12" 22-1/2° BEND ADD C2b
INV: 5015.68
FG=5019.08
12" 22-1/2° BEND ADD C3a
INV: 5025.16
FG=5031.63
12" 22-1/2° BEND ADD C3b
INV: 5025.89
FG=5030.44
12" 45° BEND ADD C2-1a
INV: 5014.90
FG=5018.54 12" 45° BEND ADD C2-1b
INV: 5014.96
FG=5017.43
12"x4" TEE ADD C2-1c
INV: 5014.99
FG=5017.21
8" 45° BEND ADD C2-9a
INV: 5016.94
FG=5029.58
Sheet
Of 17 Sheets
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c
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23
R
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2
06.17.15
C3.01
ST
O
R
M
S
E
W
E
R
P
L
A
N
NORTH
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
CONTROL
IRR
UD
UD
LEGEND:
NOTES:
W
G
T
E/T/C
SS
E
1
MI
N
O
R
A
M
E
N
D
M
E
N
T
(
M
A
1
6
0
0
2
3
)
CN
S
05
.
2
0
.
1
6
1
11
1
2
ST
O
R
M
S
E
W
E
R
A
S
-
B
U
I
L
T
S
MC
R
09
.
0
6
.
1
6
REC
O
R
D
D
R
A
W
I
N
G
2
22
2
X
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
VAULT
ELEC
X
X
X
X
UD
UD
UD
UD
UD
UD
UD
CEN
T
R
E
A
V
E
N
U
E
RO
L
L
A
N
D
M
O
O
R
E
D
R
I
V
E
PER
E
N
N
I
A
L
L
A
N
E
LOT 2
PROPOSED
COMBINATION
INLET
PROPOSED
COMBINATION
INLET (HIGH
HOOD SETTING)
6" PERFORATED
UNDER DRAIN
PROPOSED
DRAIN BASIN
PROPOSED
INLET
STORM LINE B
SEE SHEET C3.01
STORM LINE A
SEE SHEET C3.01
STORM LINE C
SEE SHEET C3.01
CLEANOUT
(TYP.)
STORM LINE C
SEE SHEET C3.01
PROPOSED
PERMEABLE
PAVERS
CHEEK WALLS
LANDSCAPE
WALLS
LANDSCAPE
WALL
4' CONCRETE
PAN
CURB CUT
CURB CUT
LANDSCAPE
WALLS
CHEEK
WALL
PROPOSED
DRAIN BASIN
TIE TO
EXISTING
TIE TO
EXISTING
FLUSH CURB
N:120756.07
E:191939.99
N:120752.16
E:191926.23
N:120809.02
E:191859.36
N:120830.51
E:191841.96
N:120888.75
E:191794.81
N:120915.39
E:191770.55
N:120929.74
E:191769.94
N:121176.00
E:191989.24
N:121020.48
E:192163.88
N:120869.64
E:192024.10
6.2%
3:1
3:1
7:1
4:1
3.
4
%
3.
9
%
5.
6
%
3.2
%
5.0%
2.8%
2.4%
5:
1
(3.
6
:
1
)
(1
0
.
7
:
1
)
(3.8
%
)
(3.7
%
)
(3.7%
)
(5.8%
)
5:1
3:1
(1.5
%
)
(2.
7
%
)
(3.6
%
)
(1.2
%
)
(2.1
%
)
4:1
4:1
1.0
%
4:1
4:1
4:
1
7:1
4.
5
%
4.8
%
4.
3
%
4.
0
%
3.
2
%
3.
8
%
1.6%
4:1
5:1
4:1
5:1
4:1
8:1
PROPOSED
DRAIN BASIN
PROPOSED
DRAIN BASIN
PROPOSED
DRAIN BASIN
TRASH
ENCLOSURE
3:1
3:1
3
STRUCTURAL
WALL
1
4.
6
%
4.
9
%
CURB CUT
CURB CUT
PROPOSED
DRAIN BASIN
RAMP
7" RISERS
LOWER LEVEL
FFE=19.80
(31.97)
(31.13)
(26.8
5
)
(13.3
8
)
(12
.
0
3
)
(8
.
4
5
)
(9
.
0
4
)
(2
1
.
9
0
)
(1
0
.
1
9
)
(31
.
6
5
)
(3
6
.
8
2
)
(3
7
.
0
6
)
(3
6
.
6
6
)
(3
3
.
2
3
)
(33.80)
(2
7
.
7
9
)
(26.25)
(29.3
0
)
(11.01)
(10.91)
31.99
32.02
32
.
3
2
32.71
31
.
3
8
31.
4
6
30.51
30.06
30.03
29.6
8
30
.
8
2
31
.
0
8
31.
1
8
31.18
32.88
32
.
1
6
31.27
31.46
19.8
3
19.
4
8
18.18
16.9
9
19.77
19.
2
8
19.
5
2
16.58
16.18
16.04
15.62
12
.
4
0
12
.
4
2
12
.
4
7
12.16
9.3
4
11.54
13.00
13.0313
.
0
4
12.66
15.57
15.94
16.11
18.91
14.63
32.
9
6
32.48
32.9
6
17.36
17.62
18
.
1
8
17.92
15.72
16
.
3
7
16.27
14.3
0
14.09
13.39
13.35
15.37
15.
1
1
15.67
15
.
9
3
32.47
19.30
33
.
0
7
33.13
33.13
33.13
19.
2
8
19
.
6
4
(33
.
1
3
)
(32
.
9
1
)
32
.
8
6
33
.
0
4
32.54
32.37
32.26
32.66
32.1
6
32.
2
1
(27.1
8
)
29.98
31
.
3
7
18.4
2
19
.
3
0
18.16
18.13
18.56
32.30
32
.
6
3
33
.
8
8
31.58
18.99
18.23
12.16
16
.
5
3
19.30
19
.
4
0
19.9
4
29
.
1
8
29.
6
9
19.01
7.7
0
15.
6
6
18.2
2
19.04
19
.
3
1
19.80
19.15
19.06
17.20
16.11
15
.
2
1
14.47
13.3
5
15.35
13.52
12.68
15.85
16.35
17.13
17
.
6
9
17.84
14
.
7
4
(1
0
.
3
3
)
(9.
7
3
)
14.
6
7
11.3
8
12.24
32.37
31
.
5
4
19
.
8
3
19.6
8
18.50
18.2
6
18.31
18.85
22.
7
4
25.62
28.39
28.47
31.2
7
31.27
19
.
6
0
19
.
5
5
19.
8
0
19.80
19.47
19.40
(3
4
.
7
9
)
(33.27)
(31.93)
(2
9
.
5
6
)
(27.93)
(26.12)
(24.35)
(22.55)
(21.94)
17
.
0
2
17.15
(9.60
)
7.7
2
21.84
22.00
16.41
13
.
3
9
15.9
5
19.
3
0
26.3
0
27.4
0
29
.
8
3
(30.45)
31.44
31.4
2
28.2827
.
0
8
26.30
19.30
28.1
9
27.
8
3
29
.
8
3
19.2
6
26.30
30.9
3
28.51
27.5
2
25
.
5
1
23.83
21
.
8
0
25.72
22.8
2
19.65
18.46
13.
9
3
13.55
(1
2
.
1
3
)
19
.
8
9
30.58
31.
2
1
32.94
15
.
1
2
12.09 11.93
13.03
16
.
0
7
MAIN LEVEL
FFE=33.13
MAIN LEVEL
FFE=33.13
33
.
1
3
19
.
3
3
26
.
3
0
20
.
2
6
20
.
0
3
20.01
19.
5
3
19.48 19.48
19.43
19.89
31
.
4
9
32
.
9
3
32.
9
7
33.05
32.99 31.69
32.6
3
33.13
18.
5
2
19.09
28
.
5
0
27.
4
1
20.12
20.12
19
.
4
3
19
.
3
0
19
.
3
0
19.8
0
19.8
0
19.30
19.72
18.
5
5
19.80
19.65
19.03
15.20
31.
5
4
32.86
32
.
4
9
31.25
32.72
32.6
6
32.65
32.07
33
.
1
3
32.49
31
.
8
3
32.05
31
.
8
6
32
.
0
9
33
.
1
3
33
.
1
3
28.47
28.39
25.72
25.6
4
22.
8
2
22
.
7
4
19.70
17.82 16.80 16.32
12
.
4
6
11
.
5
4
25.7
1
25.63
18.77
19.
1
6
19.3
9
19.56
19
.
6
4
19
.
4
7
25.81
19.5019.48
19.39
19.37
19.3
3
19.30 20.50
15.89
18
.
9
2
18
.
9
8
19.
0
5
19.44
31
.
7
7
32
.
8
1
32.72
32.88
32
.
8
8
32
.
8
6
31
.
5
8
32.
2
7
16.96
17.43
19
.
3
0
19.16
19.17
BURIED RIPRAP
(SEE DETAIL 8
ON SHEET C6.02)
BURIED RIPRAP
(SEE DETAIL 8
ON SHEET C6.02)
13.83
BURIED RIPRAP
(SEE DETAIL 8
ON SHEET C6.02)
17.50
18.15
6" PERFORATED
UNDER DRAIN
1
1
2
4' CURB
TRANS.
4' CURB
TRANS.
EXPOSED
CURB
EXPOSED
CURB
NORTH
LEGEND:
NOTES:
LOD
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
C4.00
GR
A
D
I
N
G
P
L
A
N
FIELD SURVEY BY:
Sheet
Of 17 Sheets
CE
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F
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D
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C
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O
G
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20
0
S
o
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C
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8
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4
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:
9
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2
2
1
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4
1
5
8
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i
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.
c
o
m
23
R
D
F
I
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I
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G
-
L
O
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2
06.17.15
1
MI
N
O
R
A
M
E
N
D
M
E
N
T
(
M
A
1
6
0
0
2
3
)
CN
S
05
.
2
0
.
1
6
1
11
1
2
RE
C
O
R
D
D
R
A
W
I
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G
MC
R
09
.
0
1
.
1
6
RECORD DRAWING
22
2 2
28.51
31.43
TOW30.93
31.43
TOW30.7
1
31.77
TOW
28
.
3
9
28.4
7
28
.
8
8
29.38
TOW
26.0
0
27.38
TOW
23.91
TOW
22.46
TOW
25.91
TOW
26.88
25
.
4
1
23.41
21
.
9
6
19.96
19.83
22.
7
4
22
.
8
2
25
.
6
3
28.02
TOW
28.02
TOW
24.33
TOW
24.33
TOW
27.5
2
23.83
19.80
25
.
5
1
21.80
X
X
X
X
LANDSCAPE WALL
STRUCTURAL WALL
23.60
TOW
26.30
TOW
28.50
TOW
31.65
TOW
28.50
TOW29.83
TOW
29.83
TOW
29.83
TOW 26.30
TOW
26.30
TOW
27
.
4
029.8
3
29
.
8
3
27.83
26.
3
0
19.26
19
.
3
026.3
0
28
.
5
0
27.41
28.5
0
31.4
2
25.71
25.63
20.12
26.30
19.30
19.99
20.11
34.94
TOW
28.83
TOW
26.80
TOW
26.80
TOW
27.50
TOW
28.83
TOW
26.16
TOW27.50
TOW
26.16
TOW
25.50
TOW
25.50
TOW
24.83
TOW
26.80
TOW
26.80
TOW
23.17
TOW
22.50
TOW23.17
TOW
28.2
8
27
.
2
7
20.26
19.64
25.9
2
20.94
25.8
1
22.5
0
20.30
24.8
3
23.61
26.16
26
.
1
2
27.5
0
26.12
26.3
0
25.5
0
24.06
24.83
TOW
24.17
TOW
24.17
TOW
23.50
TOW
23.50
TOW
22.84
TOW
22.84
TOW
17.98
TOW
22.50
TOW
21.83
TOW
21.17
TOW
20.50
TOW
19.83
TOW
19.17
TOW
18.50
TOW
17.98
TOW18.50
TOW19.17
TOW19.83
TOW
20.50
TOW
21.17
TOW
21.83
TOW
21.8
3
19.92
21
.
1
7
19.55
20.5
0
19.3
0
19.8
3
18.89
19.1
7
18.42
18.5
0
17.95
17.9
8
17.95
17.1
4
17.02
21.84
22.00
22.84
22.28
23.5
0
22.73
24.1
7
23.17
UD UD UD UD UD UD UD
5.65
7.65
5.65
5.6
5
5.6
5
7.36
7.3
6
7.
3
6
(6.5
0
)
(6.79
)
(7.41
)
(8.2
2
)
(6.9
3
)
(7.8
7
)
(8.7
9
)
(9.5
0
)
(8.4
5
)
(6.2
9
)
(6.5
2
)
(7.
8
6
)
(8.
4
6
)
(9
.
7
8
)
(1
0
.
8
3
)
(12
.
3
6
)
5.65
4:
1
5:
1
5.65
7.117.70
7.72
11.
5
4
11.5
4
11.3
8
12.
1
3
6.34
8.17
5.65
10.2
6
8.26
9.68
8.34
9.10
8.43
7.65
5.6
5
8.71
8.49
6.98
6.85
6.68
11.3
5
11.1
9
10.2
7
10.1
2
(7.4
0
)
7.3
1
(8.00
)
4:
1
4:
1
5:1
4:1
5:
1
EXISTING INLET A6-1
INV. IN=5003.02 (SW)
INV. OUT=5002.55 (NE)
RIM=5006.65
CLEANOUT A6-1a
INV. OUT=5003.39 (NE)
FG=5005.65
66.67 LF 18" PVC @
0
.
4
9
%
73.51 LF 6" PERFORATED PVC @ 0
.
5
0
%
NORTH
LEGEND:
NOTES:
LOD
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
C4.01
DE
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FIELD SURVEY BY:
Sheet
Of 17 Sheets
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06.17.15
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3 GRADING DETAIL
NORTH
2 GRADING DETAIL
1
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1
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SCALE 1" = 5'
SCALE 1" = 5'
SCALE 1" = 10'
1
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2 2
2
2
RECORD DRAWING
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