HomeMy WebLinkAboutSite Certifications - 11/30/20216614 E. Brilliant Sky Dr., Scottsdale, AZ 85266 • Phone (303) 913-5382 • larrycowen@comcast.net
October 5, 2021
City of Fort Collins
Stormwater Engineering and Development Review Division
700 N. Wood St.
Fort Collins, CO 80522
Attention: Mr. Wes Lamarque
RE: Ridgewood Hills Fourth Filing – Tract A
Site Certification
Dear Wes,
Please accept this letter and the attached supporting documentation as certification that
construction of the site improvements associated with the development of Ridgewood Hills Fourth
Filing – Tract A is complete, and that the site improvements have been constructed essentially in
accordance with the Final Compliance Plans and the Final Utility Plans for the project, approved by
the City of Fort Collins in August 2019.
Attached to this letter, for your review and acceptance, are the following supporting documents.
•Overall Site and Drainage Certification form, with supplementary written explanations of
items for which “N/A” or “No” is indicated
•During Construction Inspection Checklist
•Approved Grading Plan for the development site
•As-built Utilities Drawings
•CofFC Letter of Initial Acceptance for Avondale Rd.
•FCLWD/SFCSD Letter of Final Acceptance for water and sewer utilities
•Geotechnical Inspection Letter (Terracon Consultants)
•Construction photos representative of LID Sand Filter construction
Individual certifications and as-built drawings of the grading and drainage improvements made in
the immediate vicinity of each of the five residential buildings on the site have previously been
submitted and accepted by the City.
I trust that you will find the information included in this submittal to be sufficient and satisfactory.
If you have any questions or comments regarding any of the submitted documents, or regarding any
other aspect of the construction of the site improvements, please contact me.
Yours truly,
Owen Consulting Group, Inc.
Larry C. Owen, P.E.
cc: Mr. Bill Timm, M. Timm Development, Inc.
Mr. Kevin Egan, M. Timm Development, Inc.
Wes Lamarque
11/30/2021
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) Chapter 3, Section 3.0 to certify as-
built construction to the approved drainage and grading plans, 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 - FCSCM Ch. 6 and 7
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
11/19
Ridgewood Hills Fourth Filing - Tract A
Sept. 30, 2021
B2000779, B2000780, B1916097, B2000781, B2000782
N/A
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: 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.
11/19
N/A
Page 3
4.Outlet Structure:
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 Ch. 8, Sec. 2.0 and Ch. 9, Sec. 5.0
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.)
11/19
Yes
Yes
Yes
N/A
Yes
Yes
Yes
Yes
Page 4
III.Storm Pipes (aka storm drains) - FCSCM Ch. 9, Sec. 4.0
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 and construction specifications.
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 Ch. 8, Sec. 2.0
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.
11/19
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N/A
N/A
Page 5
V. Storm Drain Inlets - FCSCM Ch. 9, Sec. 3.0
A. Construction/Installation: All storm drain inlets have been constructed in accordance with the
approved construction plans and construction specifications.
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 designation (or
an equivalent): NO DUMPING – DRAINS TO POUDRE RIVER.
VI.Culverts - FCSCM Ch. 9, Sec. 4.0
A. Construction/Installation: All culverts have been constructed and/or installed in accordance with
the approved construction plans and construction specifications.
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 and the construction specifications. 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.
11/19
Yes
Yes
Yes
Yes
Yes
Yes
No
N/A
N/A
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 and construction specifications.
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 - FCSCM Ch. 8
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.
11/19
Yes
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
No
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.Permanent Erosion Control BMPs - FCSCM Ch. 9, Sec. 7.0
A. Construction: All permanent erosion control BMPs have been installed per the approved
construction plans.
1.All riprap has been installed in the locations and sizes indicated on the approved construction
plans.
2.All fabric has been installed in the locations and sizes indicated on the approved construction
plans.
a.All fabric was installed per the details on the approved construction plans.
XII.Post-Construction Site Cleanup - FCSCM Ch. 3, Sec. 2.0
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.
XIII.Certification of LID and Water Quality Facilities - FCSCM Ch. 7
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.
B.Attached is verification of the rain garden and/or sand filter flat surface area(s) and ponding
volume(s). This verification includes survey of critical elevations.
C.Attached is verification of the underground infiltration required volume(s), weir elevations,
orifices, inspection ports and filtering fabric. This verification includes survey of critical elevations.
D.All visible LID design features were verified as part of the engineer's site visit.
11/19
No
Yes
Yes
N/A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N/A
N/A
Yes
11/19 Page 8
XIV.Certification of Other Permanent BMPs
A.The construction of other permanent BMPs not specifically addressed in this certification is in
accordance with the approved plan. This may include grade control structures, rundowns, bridges, stream
access/improvements, etc.
Please specify other permanent BMPs included on this site:
XV. Certification and Erosion Control Measures - FCSCM Ch. 3
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 erosion@fcgov.com.
XVI.Statement of Compliance - FCSCM Ch. 3
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.
XVII. Signature and Stamp by a Colorado-Registered Professional Engineer
Engineer’s contact information:
Name:
Email:
Phone:
Company:
Address:
PE Stamp
Sign and date over stamp
N/A
Larry Owen
larrycowen@comcast.net
(303) 913-5382
Owen Consulting Group, Inc.
6614 E. Brilliant Sky Dr.
Scottsdale, AZ 85266 9-30-2021
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107.11 LF 8" PVC
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113.51 LF 8" PVC
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74.46 LF 8" PVC
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89.00 LF 8" PVC
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44.31 LF 8" PVC
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STORM DRAIN
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TFG Design, LLC
138 E 4th Street, STE #1
Loveland CO 80537
(970) 669.3737
design@tfgdesign.com
LANDSCAPE ARCHITECTURE PLANNING
www.tfgdesign.com
THIS DRAWING, AS AN INSTRUMENT OF S ERVICE, IS AND
SHALL REMAIN THE PROPERTY OF TFG DESIGN, LLC. - THE
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PROJECT NUMBER:
DATE:
PHASE:
M. TIMM DEVELOPMENT
BILL TIMM
233 CARILLO STREET
SANTA BARBARA, CA 93101
(805) 963-0358
RI
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111-1701FC
APRIL 25, 2018
MA
20190621 FINAL MYLARS
20210202 AS-BUILTS
30
OWEN
CONSULTING
GROUP, INC.
3715 Shallow Pond Drive
Ft. Collins, CO 80528
Phone: (970) 226-0264
larrycowen@comcast.net
UTILITY PLAN
SOUTH
7
7
30'0 15'60'90'
SCALE: 1"= 30'-0"NOR
T
H
KEY MAP
N.T.S.
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL
LEGEND
PROPOSED STORM DRAIN
WITH MANHOLE
PROPOSED STORM INLET
PROPOSED SANITARY SEWER
WITH MANHOLE
PROPOSED WATERLINE WITH
VALVE & FIRE HYDRANT
PROPOSED WATERLINE TAP METER
PROPOSED FIRELINE TAP
PROPOSED IRRIGATION LINE
WITH METER
PROPOSED ELECTRIC LINE
PROPOSED GAS LINE
EXISTING SANITARY SEWER
EXISTING WATERLINE
EXISTING STORM DRAIN PIPE
UTILITY NOTES
1.ALL SANITARY SEWER PIPE IS 8" PVC SDR-35, UNLESS NOTED OTHERWISE..
2.ALL SANITARY SEWER, WATER AND STORMWATER CONSTRUCTION SHALL
CONFORM TO SOUTH FORT COLLINS SANITATION DISTRICT, FORT
COLLINS-LOVELAND WATER DISTRICT, AND CITY OF FORT COLLINS STORMWATER
DEVELOPMENT, RESPECTIVELY CONSTRUCTION STANDARDS AND DETAILS.
3.ALL REINFORCED CONCRETE PIPE (RCP) SHALL BE CLASS III OR BETTER UNLESS
NOTED OTHERWISE.
4.ALL WATERLINE TO BE CONSTRUCTED A MINIMUM OF 5' AND A MAXIMUM OF 6' (5'
TYPICAL) BELOW FINISHED GRADE UNLESS OTHERWISE NOTED.
5.ALL WATERLINE SERVICES TO BE SIZED AS SHOWN ON THE UTILITY PLANS.
6.PROVIDE 10' HORIZONTAL CLEARANCE BETWEEN WATER AND SEWER PIPES.
7.SEE UTILITY PLANS FOR EASEMENT DELINEATION, DIMENSIONS AND DETAILS.
8.SEE UTILITY DETAIL SHEETS FOR SERVICE CONNECTION DETAILS.
9.REDUCED PRESSURE PRINCIPLE (RP) BACK-FLOW-PREVENTION-DEVICES TO BE
INSTALLED ON THE FIRE LINE RISERS AND DOMESTIC WATER SERVICES.
10.TELEPHONE AND CATV TO BE INSTALLED IN COMMON TRENCH WITH POWER.
WATERMAIN JOINT RESTRAINT REQUIREMENTS
WATERMAIN FITTINGS AND ALL ADJACENT PIPE JOINTS WITHIN THE PRESCRIBED LENGTH FROM THE
FITTINGS LISTED BELOW, SHALL BE MECHANICALLY RESTRAINED USING "MEGALUG" RESTRAIN
HARNESSES AND THRUST RODS, OR APPROVED EQUAL, INSTALLED IN ACCORDANCE WITH THE
MANUFACTURER'S RECOMMENDATIONS.
THIS JOINT RESTRAINT REQUIREMENT SHALL APPLY TO 90 DEG. BENDS, TEE BRANCHES, AND
DEAD-END RUNS, AS FOLLOWS:
-- 90 DEG. BENDS: ALL PIPE JOINTS WITHIN 12 FT OF THE FITTING.
-- TEE BRANCHES: ALL PIPE JOINTS WITHIN 24 FT OF THE FITTING
-- DEAD-END LINES: ALL PIPE JOINTS WITHIN 36 FT OF THE END CAP
-- HYDRANT ASSEMBLIES: HYDRANT LEADS SHALL BE FULLY RESTRAINED.
FFE=5097.20
3+0
0
4+
0
0
5+
0
0
5+
2
4
3+0
0
23.00'
51.00'
51'
E
A
E
R=
5
0
'
FFE=5097.20
FFE=5090.75
15.83'
30.00'
2+0
0
3+00
4+00
5+00
6+00
BUILDING 1
3+
4
8
30' U,D,
A
& EAE
8-UNIT
24-UNIT AVON
D
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NORTH
1-800-922-1987
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL
60'90'30'0 15'
HORIZ SCALE: 1"= 30'-0"
6'9'3'0 1.5'
VERT SCALE: 1"= 3'-0"
TFG Design, LLC
138 E 4th Street, STE #1
Loveland CO 80537
(970) 669.3737
design@tfgdesign.com
LANDSCAPE ARCHITECTURE PLANNING
www.tfgdesign.com
THI S DRA WIN G, AS AN INST R UM ENT OF SERVICE, IS AND
SHALL REMAIN THE PROPERTY OF TFG DESIGN, LLC. - THE
FRONT ERR A GR OUP AN D SHA LL N OT B E R E P RO D UCED ,
P U B L I S H E D O R U S E D I N A N Y W A Y W I T H O U T T H E
P E R M I S S I O N O F T H E L A N D S C A P E A R C H I T E C T .
The
Group
FronTerra
ATTN:
SHEET OF
SHEET NUMBER:
SHEET TITLE:
REVISIONS:
PROJECT INFORMATION:
OWNER:
DR
A
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PROJECT NUMBER:
DATE:
PHASE:
M. TIMM DEVELOPMENT
BILL TIMM
233 CARILLO STREET
SANTA BARBARA, CA 93101
(805) 963-0358
RI
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111-1701FC
APRIL 25, 2018
MA
20190621 FINAL MYLARS
20210202 AS-BUILTS
30
OWEN
CONSULTING
GROUP, INC.
3715 Shallow Pond Drive
Ft. Collins, CO 80528
Phone: (970) 226-0264
larrycowen@comcast.net
STORM PLAN &
PROFILE
13
13
5' TYPE R INLET B1
STMH B1
5' TYPE R INLET C3
10' TYPE R INLET C2
VERIFIED
VERIFIED
3+
0
0
51
.
0
0
'
15
.
8
3
'
6+
0
0
EX. 30" ADS N-12 PIPE TO BE REMOVED
EX. STM MANHOLE AND APPROX.
65 LF OF EX. 30" D/S STORM
DRAIN TO BE REMOVED AND
REPLACED AT GRADE SHOWN.
18 LF 18" RCP @ 2.0%
TYPE R INLET C1
RIM EL. = 5087.6±
INV. EL. = 5082.5± 5081.79
10' TYPE R INLET C2
STMH C1
STMH C2 STORM C
PIPE - (60)
STORM C
PIPE - (59)
5' TYPE R INLET C3
STORM C
PIPE - (34)
12" HDPE
ONSITE LANDSCAPE DRAINS
PER DRAINAGE PLAN
STMH C0
EXISTING STMH
NORTH
1-800-922-1987
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL
60'90'30'0 15'
HORIZ SCALE: 1"= 30'-0"
6'9'3'0 1.5'
VERT SCALE: 1"= 3'-0"
TFG Design, LLC
138 E 4th Street, STE #1
Loveland CO 80537
(970) 669.3737
design@tfgdesign.com
LANDSCAPE ARCHITECTURE PLANNING
www.tfgdesign.com
THI S DRA WIN G, AS AN INST R UM ENT OF SERVICE, IS AND
SHALL REMAIN THE PROPERTY OF TFG DESIGN, LLC. - THE
FRONT ERR A GR OUP AN D SHA LL N OT B E R E P RO D UCED ,
P U B L I S H E D O R U S E D I N A N Y W A Y W I T H O U T T H E
P E R M I S S I O N O F T H E L A N D S C A P E A R C H I T E C T .
The
Group
FronTerra
ATTN:
SHEET OF
SHEET NUMBER:
SHEET TITLE:
REVISIONS:
PROJECT INFORMATION:
OWNER:
DR
A
W
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Y
:
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PROJECT NUMBER:
DATE:
PHASE:
M. TIMM DEVELOPMENT
BILL TIMM
233 CARILLO STREET
SANTA BARBARA, CA 93101
(805) 963-0358
RI
D
G
E
W
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D
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FO
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111-1701FC
APRIL 25, 2018
MA
20190621 FINAL MYLARS
20210202 AS-BUILTS
30
OWEN
CONSULTING
GROUP, INC.
3715 Shallow Pond Drive
Ft. Collins, CO 80528
Phone: (970) 226-0264
larrycowen@comcast.net
STORM PLAN &
PROFILE
14
14
VERIFIED
VERIFIED
VERIFIED
1
RIDGEWOOD HILLS FOURTH FILING – TRACT “A”
OVERALL SITE and DRAINAGE CERTIFICATION
SUPPLEMENTARY EXPLANATIONS
Section I - Water Quality and Quantity Detention Basin
• This section is marked “N/A”, since there is no on-site detention basin associated with
this project.
• Runoff from the development site is conveyed to an existing, off-site detention basin that
was constructed as part of a previous phase of Ridgewood Hills. The adequacy of the
existing detention basin to accept the flows from the Fourth Filing was addressed in the
Final Drainage Report for both Tracts A and B (March 2014)
Section IV - Concrete Pans
• This section is marked “N/A”, since there are no concrete cross-pans within the site.
• Improvements to Avondale Rd., within the public right-of-way, are constructed in
accordance to LCUASS, including concrete curb and gutter.
• Within the on-site private driveways, the developer opted to grade and shape the asphalt
pavement to create the necessary cross-pans, rather than construct separate concrete
structures. The asphalt swales are in the same locations and at the same grades as
shown on the approved construction drawings, but are not constructed of concrete.
• Curb and gutter sections throughout the site are concrete.
Section V – Storm Drain Inlets
• Item 6: The Type “R” storm drain inlets have not been stamped or stenciled with the
words “NO DUMPING – DRAINS TO POUDRE RIVER”, but stenciling can be done, if
necessary.
Section VI – Culverts
• This section is marked “N/A”, since there are no culverts installed in conjunction with this
project, aside from small diameter (6” or 8”) PVC pipes to convey runoff from small
localized landscaped areas beneath sidewalks.
• There are also several small drain grates cast into sidewalks, to convey runoff from
landscaped areas to the parking area gutters, but these are not considered to be
culverts.
Section VII – Sub-Drains
• This section is marked “N/A”, since there are no sub-drains installed in conjunction with
this project.
Section VIII – Curb Cuts
• There are a number of curb cuts along the south side of the south drive aisle, however,
these curb cuts do not drain directly into a downstream swale or pipe. Rather, they
discharge into purpose-made sediment traps, which overflow into a landscaped swale
which includes a series of check dams and an underdrain. The swale conveys runoff
ultimately to the sand filter. There are no obstructions or impediments, other than the
purpose-made check dams.
2
Section IX – Sidewalk Culverts & Chases
• A sidewalk chase has been installed across the public sidewalk along the south side of
Avondale Rd. This chase is in accordance with the City detail, and has been inspected
and accepted by the City inspector.
Section X – Site Grading
• Finished grading has been completed around the residential buildings and in the
common open-space areas. All grading is generally in accordance with the approved
Grading Plan for the site. Therefore, as-built contours in the common area open spaces
are not shown on the as-built drawings.
• The development site abuts the rear property lines of 24 single-family residential lots
along the west and south perimeters of the site. The as-built grades were not surveyed
at all the abutting property corners, so the elevations at these locations are not shown
on the as-built drawings. However, the final grading was performed so as to match the
match the existing adjacent grades along the full length of the site boundaries, in order
to avoid discontinuities across the property line and to avoid any potential adverse
drainage impacts.
Section XIII – Certification of LID and Water Quality Facilities
• Items “B” and “C” are marked “N/A”, since there are no rain gardens or underground
infiltration facilities installed in conjunction with this project.
Section XIV – Certification of Other Permanent BMPs
• This section is marked “N/A”, since there are no other permanent BMPs installed in
conjunction with this project.
1/19 Page 1 of 2
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.
Project Name: Ridgewood Hills Fourth Filing Tract A Date: September 29, 2021
Building Permit Numbers: B2000779, B2000780, B1916097, B2000781, B2000782
I. Compaction
A. Yes 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. Yes The pipe trenches have been compacted in accordance with Section 02225-3.07.A.1. of the Fort Collins Development Construction
Standards for Water, Wastewater, Stormwater (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. Energy Dissipation and Erosion Protection - FCSCM Chapter 9, Section 7.0
A. Riprap
1. N/A The riprap bedding is a granular bedding of the gradation and thickness indicated on the approved construction plans.
2. N/A 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.
3. N/A The riprap is the gradation shown on the approved construction plans with a D50 of .
4. N/A The riprap thickness is as shown on the approved construction plans and extends to the horizontal limits shown.
5. N/A The riprap is buried to the depth indicated on the approved construction plans. (A minimum of 6 inches of soil is required.)
B. Permanent Erosion Control Fabric - FCSCM Vol.1, Ch.7
1. No All fabric was installed per manufacturer’s specifications.
1/19 Page 2 of 2
IV. Other Permanent BMPs
A. N/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.)
V. Extended Detention Basins
A. N/A Installation of this facility was verified via inspection by a City-Stormwater Inspector at the point of installation of the water quality
control box(es). Provide date of inspection and name of inspector:
Included certification sheet(s):
Please check the appropriate box(es) for the Low Impact Development
(LID) facilities found on this site and complete the corresponding
certification sheets.
☐ Permeable Interlocking Concrete Pavers
☐ Bioretention Cells (Rain Gardens)
☒ Sand Filters
☐ Vegetated Buffers
☐ Underground Infiltration
☐ Other LID – For certification of Dry Wells, Tree Filters,
Constructed Wetland Channels & Ponds, etc., contact City Staff
to determine requirements to exhibit the LID facility has been
constructed and functions as intended per the approved
drainage report.
*Please provide photographic documentation of the installation of all
stages of all LID facilities.
**Please contact the City Stormwater Inspector at
stormwaterinspection@fcgov.com to discuss inspection requirements
for each LID facility and request inspections.
***All facilities being certified must be “clean” – free of sediment &
construction debris – prior to certification or acceptance of the facility.
Completed by:
Name: Kevin Egan
Title: Project Mgr / Site Sup’t
Email: kegan@mtimm.com
Phone: (805) 896-2498
Company: M. Timm Development, Inc.
Address: 233 E. Carrillo St., Ste. D
Santa Barbara, CA 93101
1/19 Page 1 of 3
Sand Filters
Item/Activity Yes No N/A Submittal Requirements Submitted?/Response
Stormwater Inspection
Pre-construction meeting was held with City-Stormwater
Inspector to discuss installation, inspection, checklist, and
protection from sedimentation
☒ ☐ ☐
Record date, inspector name, meeting
location (i.e. DCP, initial erosion control
inspection, etc.)
Underdrain and basecourse inspection(s): Installation of this
facility was verified via inspection by a City-Stormwater
Inspector at the point of installation of the outlet, underdrain,
geomembrane layer, and base course (per design in Final Plan
Documents)
☒ ☐ ☐
Record date(s) of inspection and
inspector’s name
Pea gravel and filter media inspection(s): Installation of this
facility was verified via inspection by a City-Stormwater
Inspector at the point of installation of the pea gravel and filter
media
☒ ☐ ☐
Record date(s) of inspection and
inspector’s name
Excavation
Heavy equipment did not encroach into the excavated area
(prevents over-compaction) ☒ ☐ ☐
Bottom of cell was “ripped” after excavation ☐ ☒ ☐ Provide photographs before and after
“ripping”
Bottom surface of cell is flat and level ☒ ☐ ☐ Provide photograph
Excavated area is protected/surrounded by sediment/runoff
control measures during construction ☒ ☐ ☐ Provide photograph
Intake
Upstream catchment drains to inlet/sand filter per plan and
flows are fully captured ☒ ☐ ☐
Forebay (If Applicable)
Forebay is installed according to design specifications ☐ ☐ ☒ Provide photograph
There is a minimum 3” drop at the forebay entrance ☐ ☐ ☒ Provide photograph
Forebay will drain fully and not hold standing water ☐ ☐ ☒
Outlet Structure/Overflow
Overflow inlet elevation is set above sand filter media per plan
(typically 1 to 3 feet) ☒ ☐ ☐ Provide photograph
Overflow inlet invert elevation is at least 3 inches below
containment wall/berm (to direct overflow into inlet) ☒ ☐ ☐
Measure and record distance between
inlet and top of containment wall/berm;
provide photograph
Please see notes at the end of this form for additional explanatory comments.
1/19 Page 2 of 3
Overflow path and check dams, if used, are armored to protect
from erosion and maintain elevations ☐ ☐ ☒ Provide photograph
Impermeable Liner (If Applicable)
Impermeable liner meets design specifications ☐ ☐ ☒ Provide specifications of delivered
material
Impermeable liner is appropriately anchored to the perimeter
wall ☐ ☐ ☒ Provide photograph
Impermeable liner is buried with no exposure ☐ ☐ ☒
Any penetrations of the impermeable liner have been sealed
and checked for water-tightness ☐ ☐ ☒ Provide photograph (if necessary)
Underdrain System
Underdrain pipe meets design specifications ☒ ☐ ☐ Provide photograph
At least one cleanout is provided per underdrain lateral ☒ ☐ ☐ Provide photograph
Cleanout pipe is solid (not perforated/slotted) ☒ ☐ ☐ Provide photograph
Cleanout covers are installed and watertight ☒ ☐ ☐ Provide photograph
Verify the underdrain is NOT wrapped in geotextile fabric ☐ ☒ ☐ Provide photograph
Verify there is no orifice plate on the underdrain outfall ☒ ☐ ☐ Provide photograph
Underdrain integrity tested after backfilling using TV and/or
water test ☒ ☐ ☐ Provide documentation of test results
Filter Media
Filter media composition (e.g. ASTM C 33 Sand):
- meets design specifications
- is installed to the required design depth
☒ ☐ ☐
Provide load ticket, photographs, and
record depth installed
Pea gravel layer:
- meets design specifications
- is installed to the required design depth
☒ ☐ ☐
Provide load ticket, photographs, and
record depth installed
Filter Media is installed flat and level ☒ ☐ ☐
Other Structural Components
Containment wall/berm is continuous and level ☒ ☐ ☐
Landscaping
Verify final landscaping is free of sod ☐ ☒ ☐ If sod is used, it must be shown to be
“sand-grown”
Final landscaping (non-floatable mulch) is flat and level ☒ ☐ ☐ Provide photograph
Vegetation is planted according to landscape design
specifications and final landscaping plan ☒ ☐ ☐ Provide photograph
Verify that weed barrier is NOT installed ☐ ☒ ☐
1/19 Page 3 of 3
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
sand filter cell ☒ ☐ ☐
NOTES:
Meetings and Inspections
1. Due to concerns related to COVID, joint meetings / inspections with the contractor and City personnel on-site, were limited. Communications
were had primarily by phone and messaging, and the contractor agreed to extensive photo documentation. It is understood that City
personnel inspected the sand filter installation, but exact dates and personnel are not known.
2.Terracon Consultants tested the materials incorporated into the sand filter and inspected the installation. Their compliance letter is attached.
Excavation
1. Heavy equipment operation in the sand filter area was restricted after initial excavation. A track mini excavator and a track skid loader
performed the excavation and preparation of the floor of the sand filter area. It was observed that the density of the floor of the area
remained low and water was observed to percolate into the subgrade soils. Ripping of the subgrade soils was determined to not be
necessary, as the native soils remained very loose.
2. The sand filter excavation was protected prior to and during installation of the media, and no runoff sediment entered the area. The sand
filter is currently protected by a filter fabric cover, pending establishment of vegetation to stabilize the adjacent slopes.
Outlet Structure / Overflow
1. Photos are attached showing the installation of the underdrain pipe and the filter media, as well as the outlet structure and inlet / outlet
pipe penetrations. There is no orifice plate on either the inlet or outlet piping of the outlet structure.
Underdrain System
1. The underdrain piping is slotted, as specified. The pipe is enclosed in a very light geotextile sock, which does not inhibit flow into the pipe,
but serves only to keep small aggregate particles away from the slots in the pipe.
2. Cleanout standpipes are located at intervals along the length of the underdrain pipe that runs beneath the swale that is upstream of the
sand filter and which is continued beneath the sand filter. These are available for flushing the underdrain piping.
3. A water test was performed, whereby water that was discharged onto the sand surface was observed to percolate into the sand and
subsequently flow out of the underdrain pipe and into and through the outlet structure.
Landscaping
1. Final landscaping within the apartment complex includes sod, but that sod is “sand grown”. No permanent weed barrier is not installed
over the sand filter area, but is installed in other mulched areas of the site.
LOT 394
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TRACT
B
12'
50'
F
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(
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)
5'
8'
EXISTING
STREET LIGHT
ENHANCED
CROSS WALK TO
MATCH EXISTING
EXISTING
TRAFFIC YIELD
SIGN
CROSSWALK SIGN
YIELD SIGN
PEDESTRIAN CROSSING SIGN
NO PARKING
ANYTIME SIGN
PROPOSED
NEW CURB
PROPOSED
NEW CURB
5
12
13
11
14
6
9
9
10
88
8
10
6
10
10
14
9
7
27
36
27
2
2
BUILDING 2
(16-UNIT W/
WORKOUT
ROOM)
RIDGEWOOD HILLS PUD
THIRD FILING
TRACT AA LOT 174
LOT 175
LOT 176
LOT 177
LOT 178
LOT 179
LOT 180
LOT 181
LOT 184
LOT 185
TR
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Z
LOT 186
LOT 187
LOT 188
LOT 189
LOT 190
LOT 191
LOT 192
LOT 193
LOT 194
LOT 195
LOT 196
LOT 197
LOT 198
LOT 199
RIDGEWOOD HILLS PUD
THIRD FILING
RIDGEWOOD HILLS PUD
THIRD FILING
TRA
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BUILDING 1
(24-UNIT)
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8'
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(TY
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6
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8'
(V
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BUILDING 4
(16-UNIT)
BUILDING 3
(24-UNIT W/
LEASING OFFICE)
BUILDING 5
(24-UNIT)
8'
35' BUILDING
SETBACK
35' BUILDING
SETBACK
20' BUILDING
SETBACK
WALKWAY
SPINE
WALKWAY
SPINE
COURTYARD
FEATURE
TRASH ENCLOSURE,
(TYP)
DRAINAGE EASEMENT
TREE WELL, (TYP)
SEAT WALL,
SEE DETAIL 3
SHEET 4
TYPE III
BARRICADE
TRAIL CONNECTION
IN TRACT Z, TRAIL TO
BE ALIGNED AROUND
EXISTING TREES)
EOA
PET STATION,
SEE DETAIL 9 SHEET 4
PET STATION,
SEE DETAIL 9
SHEET 4
MODULAR RETAINING
WALL, SEE DETAIL 1
SHEET 4; REFER
GRADING PLANS
ADJACENT
NEIGHBORHOOD
SIDE SHIELD
SIDEWALK CHASE &
CURB CUT
PROPOSED
STREET LIGHT
CHECK DAMS (TYP),
REFER LID SHEETS
BIOSWALE
REFER LID SHEETS
SEDIMENT TRAP
REFER LID
SHEETS, (TYP)
ADJACENT
NEIGHBORHOOD
SIDE SHIELD
END OF EXISTING
ASPHALT
PROPOSED
STREET LIGHT
15' BUILDING
SETBACK
SEDIMENT TRAP WITH
PAVER EDGER
REFER LID SHEET
FUTURE EXTENSION OF
SIDEWALK TO OCCUR
WITH FUTURE EXTENSION
OF AVONDALE
MODULAR RETAINING WALL
REF DETAIL 1 SHEET 4
REFER GRADING PLANS
ADJACENT
NEIGHBORHOOD
SIDE SHIELD
PLANTING POCKET DETAIL (TYP)
REFER LID SHEET
PROPOSED 5'
WIDE CONCRETE
WALK
TRAIL CONNECTION
(CONCRETE IN
IN TRACT A)
MAIL KIOSK
REFER DETAIL 8
SHEET 4
COURTYARD
FEATURE
COVERED
VERTICAL BIKE
PARKING, SEE
DETAIL (TYP)
TOT-LOT W/
BENCH
SEATING
AREA
MAINTENANCE
GARAGE
SEDIMENT TRAP WITH
MODULAR RETAINING
WALL SEE DETAIL 1
SHEET 4 AND
REFER LID SHEET
SEDIMENT TRAP WITH
PAVER EDGER
REFER LID SHEET
SEDIMENT TRAP WITH
MODULAR RETAINING
WALL SEE DETAIL 1
SHEET 4 AND
REFER LID SHEET
SEDIMENT TRAP WITH
MODULAR RETAINING
WALL SEE DETAIL 1
SHEET 4 AND
REFER LID SHEET
EXISTING SANITARY
SEWER EASEMENT
SUMP OUTLET
REFER CIVIL & LID
PLANS
RIP-RAP
WORKOUT
ROOM
LEASING
OFFICE
TEMPORARY TURN
AROUND FOR
EMERGENCY
VEHICLES
PROPOSED
MONUMENT SIGN
APPROXIMATELY 6'
HEIGHT X 14' LENGTH
12
9
8
27
6
9
15
NORTH
60'90'30'0 15'
SCALE: 1"= 30'-0"
SITE PLAN
2
2
TFG Design, LLC
E t Steet, STE
Loend CO
.
designtfgdesign.com
LANDSCAPE ARCHITECTURE PLANNING
www.tfgdesign.com
THI S D R A WIN G, AS AN INSTRUME N T O F SER VICE , I S A ND
SHALL REMAIN THE PROPE RTY OF TFG DESIGN, LLC. - THE
F RO N T ER R A G RO U P A N D S HA L L NOT B E RE P RO D U C E D ,
PUBLISHED OR USED IN ANY WAY WITHOUT THE PERMISSION
O F T H E L A N D S C A P E A R C H I T E C T .
The
Group
FronTerra
ATTN:
SHEET OF
SHEET NUMBER:
SHEET TITLE:
REVISIONS:
PROJECT INFORMATION:
OWNER:
DR
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PROJECT NUMBER:
DATE:
PHASE:
Bill Timm
233 Carillo Street
Santa Barbara, CA 93101
(805)963-0358
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111-122FC
APR 25, 2018
MA
20190621 FINAL MYLARS
6
6
15
8
PARKING SPACES
BIKE PARKING SPACE
BIKE PARKING SPACE (COVERED)
LANDSCAPE BOULDER RETAINING WALL
BIKE RACK
PRIVATE SITE LIGHT
PET STATION
PROPOSED STREET LIGHT
EXISTING STREET LIGHT
MODULAR RETAINING WALL
1. TRASH REMOVAL SHALL BE RESTRICTED TO BUSINESS HOURS
ONLY (8AM TO 5PM, MON.-FRI.)
2. TRACT 'A' IS ZONED M-M-N.
3. ALL POLE-MOUNTED AND BUILDING-MOUNTED LIGHTING SHALL
FEATURE FULLY SHIELDED, DOWN DIRECTIONAL AND DARK SKY
COMPLIANT FIXTURES AND COMPLY WITH SECTION 3.2.4 OF THE
LAND USE CODE.
4. ALL BUILDING AND GROUND-MOUNTED MECHANICAL
EQUIPMENT WILL BE SCREENED AND PAINTED AS
REQUIRED BY THE LAND USE CODE. SEE NOTE #7 ON SHEET 7.
MATCHLINE - SAME SHEET
MATCHLINE - SAME SHEET