HomeMy WebLinkAboutHANSEN FARM - FDP190010 - SUBMITTAL DOCUMENTS - ROUND 1 - SUPPLEMENTAL INFORMATION (26)Erosion Control Review : Comments & Redlines
Project Information
Project Name: ______________________________ Project Number: ____________________
Prior Name(s): ______________________________ Prior Number(s): ______________________
Round _____ Date Submitted: _____________ Comment Due Date: _____________
Total Disturbance __________ SF
GPS Lat _______________ GPS Long _______________
Sensitive Area _____ Steep Slopes (3H:1V) _____
This review or prior reviews showed this to be well under the threshold for needing erosion control. _____
Project Review Check Sheets & Comments
Comments:
__________
Staff
Dev Review Coordinator ______________
Zoning ______________
Planner ______________
Engineer______________
Water Utilities Reviewer ______________
Developing Party
Owner ______________
Owner’s Company ____________
Developer ______________
Developer’s Company ____________
EC Design Engineer ______________
EC Design Firm ______________
Review Information
Reviewer: _____________________
Received: _____________
Completed Review: __________
Cursory Review Time (hr.): __________
Full Review (hr.): __________
Phone Correspondence (hr.): __________
Email Correspondence (hr.): __________
Internal Staff Coordination (hr.): __________
Applicant Meeting (hr.): __________
Enter all hours round to the nearest 0.25 (15 min)
1
Jesse Schlam
From: Development Review Coordinators
Sent: Friday, April 26, 2019 5:03 PM
To: Development Review Group
Subject: Development Review Weekly Project Summary 04.26.2019
Attachments: Intrawest - COMMENTS DUE; Meyer Subdivision - COMMENTS DUE; Dutch Bros - COMMENTS DUE;
Hansen Farm FDP - COMMENTS DUE; Penny Flats 2nd - COMMENTS DUE
Development Review Weekly Project Summary
Projects Submitted This Week (4/18 ‐ 4/24)
Project Name Project
Number
Previous Project
Number(s) Project Team Status
Comments
Due Date
1 Dutch Bros PDP190008 CDR180092 Brandy, Pete,
Morgan Routed 05/14/2019
2 Intrawest
MA180082 /
BDR180035 CDR180061
Brandy, Clark, Missy,
Spencer Routed 05/07/2019
3 Penny Flats 2nd BDR190009 NA Brandy, Clark,
Spencer Routed 05/14/2019
4 Hasen Farm
FDP
FDP190010 CDR170027,
PDP170036 Tenae, Pete, Marc Routed 05/14/2019
5 Meyer
Subdivision
FDP190006 BDR180039 Brandy, Kai, Marc Routed 05/07/2019
*Scroll down for more information on the projects that have been routed this week
Routed Minor Amendments and County Referrals
Upcoming Projects To Be Submitted
Project Name Project Number Project Team Routed
Date
Comments
Due Date
Snack Attack MA190012 Jamie, Spencer 04/24/2019 05/08/2019
Heatheridge Lakes –
Building M Landscape
Renovations
MA190019 Arlo, Marc 04/25/2019 05/09/2019
Target Boardwalk –
Drive‐up Program MA190024 TBD 04/25/2019 05/09/2019
Target Council Tree –
Drive‐up Program MA190025 TBD 04/25/2019 05/09/2019
Trust Your Dog Training
Sketch Plan Special
Review
CRF190010 Ryan Mounce 04/26/2019 05/20/2019
In‐Situ Inc. MA190026 Missy, TBD 04/26/2019 05/10/2019
2
Upcoming Hearings and Neighborhood Meetings
*Routed Project Information:
1. Dutch Bros – PDP190008
Round: 1
Project Team
Coordinator: Brandy
Planner: Pete
Engineer: Morgan
Project Location: Located at 121 Kensington Drive
Project Description: This is a request for a Project Development Plan to construct an 823 square food drive‐thru
coffee shop on a portion of the property located north of Jiffy Lube (same parcel) at 121 Kensington Dr (parcel
#9735443001). The site is located on the South West corner of Kensington Drive and College Avenue. The
property will be re‐platted to create a separate lot for the coffee shop. Access will be taken from the north‐
south private drive. The proposed project is located in the General Commercial (CG) zone district and is subject
to Planning and Zoning Board (Type 2) Review.
PDT USE ONLY: S:\CDNS\Planning\Project Submittal Documents\Dutch Bros\0_PDP\5_Submittal\Round_1
2. Intrawest – BDR180035 / MA180082
Round: 2
Project Team
Coordinator: Brandy
Planner: Clark
Zoning Facilitator: Missy
Engineer: Spencer
Project Location: Located at 3500 John F Kennedy Parkway
Project Name/Type Project Team Tentative Submittal Date
Waterglen Solar Array Brandy, Kai, Applicant update‐
Deferred at this time
Sanctuary on the Green Todd, Jason, Spencer 05/08/2019
Project Name Hearing/Neighborhood
Meeting? Date/Time/Location
Meyer Subdivision Type 1 Hearing May 8th / 5:30P / 281 N
College Ave
VOA Senior Housing Type 2 Hearing May 16th / 6:00P / Council
Chambers
CSU Lake and Prospect
Parking Lot SPAR
May 16th / 6:00P / Council
Chambers
3
Project Description: This is a request for a Basic Development Review subdivide 3500 JFK Parkway into two legal
lots via the Minor Subdivision process (parcel #9725312001). The applicant also proposes to amend the existing
Arena Master Plan to illustrate additional land use on the site formerly occupied by a bank drive‐thru facility.
The drive‐thru facility has been abandoned for several years and there is no longer a banking facility on the site.
The project is within the General Commercial (CG) zone district.
PDT USE ONLY: S:\CDNS\Planning\Project Submittal Documents\Intrawest\BDR ‐ Replat\0_Submittal\Round_2
3. Penny Flats 2nd – BDR190009
Round: 1
Project Team
Coordinator: Brandy
Planner: Clark
Engineer: Spencer
Project Location: Located at 209 Cherry Street, Lot 2
Project Description: This is a request for a Basic Development Review to create clean lot matching the current
title at this parcel, specifically the termination of the former easement reserved for the railroad. No
Development is proposed at this time.
PDT USE ONLY: S:\CDNS\Planning\Project Submittal Documents\Penny Flats 2nd\4_Submittal\Round_1
4. Hansen Farm – FDP190010
Round: 1
Project Team
Coordinator: Tenae
Planner: Pete
Engineer: Marc
Project Location: Located on the west side of Timberline Rd at Zephyr Rd
Project Description: This is a request for a Final Development Plan (FDP) for a portion of the Hansen Farm
property located at the West side of S Timberline Rd at Zephyr Rd (parcel #86071000002). The FDP includes 178
dwelling units (116 single‐family detached and 62 single‐family attached), a central open space, a future park
and internal trail connections and a regional trail along the northern boundary. The proposed project is located
in the Low Density Mixed‐Use Neighborhood (LMN).
PDT USE ONLY: S:\CDNS\Planning\Project Submittal Documents\Hansen Farm\FDP\Submittal
Documents\Round 1
5. Meyer Subdivision – FDP190006
Round: 3 (to print mylars)
Project Team
Coordinator: Brandy
Planner: Kai
Engineer: Marc
4
Project Location: 2200 Kechter Rd
Project Description: This is a request for a combined Project Development Plan/Final Development Plan to plat
the parcel and establish the residential use at 2200 Kechter Rd (parcel #8605300014). The site is accessed from
the south off Kechter Rd. The 2.46 acre property is zoned Urban Estate.
PDT USE ONLY: S:\CDNS\Planning\Project Submittal Documents\Meyer Subdivision\PDP_FDP\0_Submittal\Round_3
Document Download. Paper copies will not be distributed. Digital copies are available for download at the links under
the individual project.
FOR OUTSIDE AGENCIES:
Go to http://citydocs.fcgov.com/ Enter project number in the search bar to find submittal materials.
Please allow 1‐2 business days for the records to be updated.
The Staff Review Meetings are scheduled for May 15th (unless otherwise noted). The Staff Review Agenda will
indicate the time of the meeting.
Please provide any comments you may have in Accela by the due date. Please save any redlines to the “Redlines”
folder in the Project Submittal Documents file or email directly to the Development Review Coordinator.
If you do not have access to the Accela program, please send your comments via email to the Development Review
Coordinator for the project. Should you need assistance with entering comments in Accela or have any other questions,
please contact the Development Review Coordinator prior to the meeting.
If additional submittal documents were requested and are not provided or if there are other issues with the electronic
document routing, please notify the Development Review Coordinator as soon as possible.
Development Review Coordination
Tenae Beane / Brandy Bethurem Harras / Todd Sullivan
City of Fort Collins Community Development & Neighborhood Services
281 N. College Ave.
Fort Collins, CO 80524
970.221.6689
DRCoord@fcgov.com
Page 1
April 17, 2019
Hansen
Design Narrative
Project Title: Hansen
Past Approval Dates: PDP Approval: December 13, 2018
Zoning: LMN (current FDP), MMN & NC (future development)
Hearing Type: Administrative Approval
General Information: The site is approximately 69.72 gross AC with residential uses
proposed (Single Family Detached), Townhomes (Single Family Attached) and future MMN
and Neighborhood Commercial uses. The zone district being developed is LMN which is
primarily intended for single family detached and attached housing. This site, south of the
Willow Springs Neighborhood and east of Timberline Road, will include116 Single Family
Detached and 62 Single Family Attached homes lots, a large central open space, a future
park and internal trail connections and a regional trail along the northern boundary.
Zephyr Road and Twisted Root Drive are proposed neighborhood streets, off of Timberline
Road that residents will take their access from. A ten-foot regional trail is proposed along
the northern property boundary which will provide connections within the neighborhood as
well as to Timberline Road, future development to the south and beyond to the Power Trail.
The large central open space will have at 5’ soft surface trail that loops the amenity. Natural
features on-site will be preserved and areas of disturbance will be restored with native
grasses. A natural habitat buffer zone and 50’ buffer surround the 10’ regional trail. This
also serves as a buffer between the rear lot lines and the Mail Creek Ditch located on the
north side of the property.
Uses surrounding the property consist of the following:
South: Rennat Property
West: Rennat Property
North: Willow Springs Neighborhood
East: Timberline Road
The project will be designed to be compatible with the surrounding neighborhoods as
required by the City Code. Architectural compatibility will be achieved by incorporating
design elements from the surrounding neighborhood such as building materials, horizontal
elements, fenestration and roof lines.
Existing Owners: Lorson North Development Corp.
S. TIMBERLINE DRIVE RD.
KECHTER RD
ZEPHRY RD.
CS1
COVER SHEET
1
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
Call before you dig.
R
APRIL 2019
PROJECT
LOCATION
VICINITY MAP
NORTH
I hereby affirm that these final
construction plans were prepared
under my direct supervision, in
accordance with all applicable City
of Fort Collins and State of
Colorado standards and statutes,
respectively; and that I am fully
responsible for the accuracy of all
design. revisions, and record
conditions that I have noted on
these plans.
These plans have been reviewed by the City of Fort Collins for concept only. The review does not imply responsibility
by the reviewing department, the City of Fort Collins Engineer, or the City of Fort Collins for accuracy and correctness
of the calculations. Furthermore, the review does not imply that quantities of items on the plans are the final quantities
required. The review shall not be construed for any reason as acceptance of financial responsibility by the City of Fort
Collins for additional quantities of items shown that may be required during the construction phase.
DISCLAIMER STATEMENT:
CERTIFICATION STATEMENT:
Northern Engineering Services, Inc.
Project No. HNP
Date: March 1, 2004
Additional Field Survey:
Project No. 911-015
Date: May 10, 2017
ORIGINAL FIELD SURVEY BY:
CONTACT INFORMATION
PROJECT TEAM:
Danny Weber, PE
Northern Engineering Services, Inc.
301 North Howes Street, Sutie 100
Fort Collins, Colorado 80521
(970) 221-4158
Bob Tessely, PLS
Northern Engineering Services, Inc.
301 North Howes Street, Sutie 100
Fort Collins, Colorado 80521
(970) 221-4158
CONTACT INFORMATION
PROJECT TEAM:
Jeff Mark
Lorson South Land Corp
A. GENERAL NOTES
1. All materials, workmanship, and construction of ppublic improvements shall meet or exceed the standards and specifications set forth in the
Larimer County Urban Area Street Standards and applicable state and federal regulations. Where there is conflict between these plans and
the specifications, or any applicable standards, the most restrictive standard shall apply. All work shall be inspected and approved by the
City of Fort Collins.
2. All references to any published standards shall refer to the latest revision of said standard, unless specifically stated otherwise.
3. These public improvement construction plans shall be valid for a period of three years from the date of approval by the City of Fort Collins
Engineer. Use of these plans after the expiration date will require a new review and approval process by the City of Fort Collins prior to
commencement of any work shown in these plans.
4. The engineer who has prepared these plans, by execution and/or seal hereof, does hereby affirm responsibility to the City of Fort Collins, as
beneficiary of said engineer's work, for any errors and omissions contained in these plans, and approval of these plans by the City of Fort
Collins Engineer shall not relieve the engineer who has prepared these plans of all such responsibility. Further, to the extent permitted by
law, the engineer hereby agrees to hold harmless and indemnify the City of Fort Collins, and its officers and employees, from and against all
liabilities, claims, and demands which may arise from any errors and omissions contained in these plans.
5. All storm sewer construction, as well as power and other "dry" utility installations, shall conform to the City of Fort Collins standards and
specifications current at the date of approval of the plans by the City of Fort Collins Engineer.
6. The type, size, location and number of all known underground utilities are approximate when shown on the drawings. It shall be the
responsibility of the Developer to verify the existence and location of all underground utilities along the route of the work before commencing
new construction. The Developer shall be responsible for unknown underground utilities.
7. The Developer shall contact the Utility Notification Center of Colorado (UNCC) at 1-800-922-1987, at least 2 working days prior to beginning
excavation or grading, to have all registered utility locations marked. Other unregistered utility entities (i.e. ditch / irrigation company) are to
be located by contacting the respective representative. Utility service laterals are also to be located prior to beginning excavation or grading.
It shall be the responsibility of the Developer to relocate all existing utilities that conflict with the proposed improvements shown on these
plans.
8. The Developer shall be responsible for protecting all utilities during construction and for coordinating with the appropriate utility company for
any utility crossings required.
9. If a conflict exists between existing and proposed utilities and/or a design modification is required, the Developer shall coordinate with the
engineer to modify the design. Design modification(s) must be approved by the City of Fort Collins prior to beginning construction.
10. The Developer shall coordinate and cooperate with the City of Fort Collins, and all utility companies involved, to assure that the work is
accomplished in a timely fashion and with a minimum disruption of service. The Developer shall be responsible for contacting, in advance,
all parties affected by any disruption of any utility service as well as the utility companies.
11. No work may commence within any public storm water, sanitary sewer or potable water system until the Developer notifies the utility
provider. Notification shall be a minimum of 2 working days prior to commencement of any work. At the discretion of the water utility
provider, a pre-construction meeting may be required prior to commencement of any work.
12. The Developer shall sequence installation of utilities in such a manner as to minimize potential utility conflicts. In general, storm sewer and
sanitary sewer should be constructed prior to installation of the water lines and dry utilities.
13. The minimum cover over water lines is 4.5 feet and the maximum cover is 5.5 feet unless otherwise noted in the plans and approved by the
Water Utility.
14. A State Construction Dewatering Wastewater Discharge Permit is required if dewatering is required in order to install utilities or if water is
discharged into a storm sewer, channel, irrigation ditch or any waters of the United States.
15. The Developer shall comply with all terms and conditions of the Colorado Permit for Storm Water Discharge (Contact Colorado Department
of Health, Water Quality Control Division, (303) 692-3590), the Storm Water Management Plan, and the Erosion Control Plan.
16. The City of Fort Collins shall not be responsible for the maintenance of storm drainage facilities located on private property. Maintenance of
onsite drainage facilities shall be the responsibility of the property owner(s).
17. Prior to final inspection and acceptance by the City of Fort Collins, certification of the drainage facilities, by a registered engineer, must be
submitted to and approved by the Stormwater Utility Department. Certification shall be submitted to the Stormwater Utility Department at
least two weeks prior to the release of a certificate of occupancy for single family units. For commercial properties, certification shall be
submitted to the Stormwater Utility Department at least two weeks prior to the release of any building permits in excess of those allowed
prior to certification per the Development Agreement.
18. The City of Fort Collins shall not be responsible for any damages or injuries sustained in this Development as a result of groundwater
seepage, whether resulting from groundwater flooding, structural damage or other damage unless such damage or injuries are sustained as
a result of the City of Fort Collins failure to properly maintain its water, wastewater, and/or storm drainage facilities in the development.
19. All recommendations of the Final Drainage and Erosion Control Report for Hansen Property dated April 17, 2019 by Northern Engineering
Services, Inc., shall be followed and implemented.
20. Temporary erosion control during construction shall be provided as shown on the Erosion Control Plan. All erosion control measures shall
be maintained in good repair by the Developer, until such time as the entire disturbed areas is stabilized with hard surface or landscaping.
21. The Developer shall be responsible for insuring that no mud or debris shall be tracked onto the existing public street system. Mud and
debris must be removed within 24 hours by an appropriate mechanical method (i.e. machine broom sweep, light duty front-end loader, etc.)
or as approved by the the City of Fort Collins street inspector.
22. No work may commence within any improved or unimproved public Right-of-Way until a Right-of-Way Permit or Development Construction
X
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MM
M F.O.
T S
T S
T S
T S
NORTHWEST
RAIN GARDEN
DETENTION POND 2
100-YR VOL=1.85 ac-ft
NORTHEAST PEAK RELEASE=3.48 cfs
RAIN GARDEN
DETENTION POND 3
100-YR VOL=2.24 ac
PEAK RELEASE=9.89 cfs
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1B
2D
2F
2G
2I
3C
FUTURE
DETENTION POND 5
100-YR VOL=0.81 ac-ft
PEAK RELEASE=0.60 cfs
DETENTION POND 1
100-YR VOL=10.01 ac-ft
X
X
B M
12" W
12" W
X
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TELE
X
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GAS
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.O.
MM
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IRR
T S
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Sheet
of 69
HANSEN SUBDIVISION These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
301 North Howes Street, Suite 100
Fort Collins, Colorado 80521
E NGINEER ING
N O R T H E RN
PHONE: 970.221.4158
www.northernengineering.com
EC2
EROSION CONTROL DETAILS
69
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
Call before you dig.
R
VEHICLE TRACKING CONTROL PAD SHALL BE LOCATED AT EVERY ACCESS POINT TO THE CONSTRUCTION SITE.
A SIGN SHALL BE PLACED NEXT TO THE VEHICLE TRACKING CONTROL PAD TO DESIGNATE THE LOCATION AS THE CONSTRUCTION ENTRANCE/EXIT.
VEHICLE TRACKING CONTROL PADS SHALL CONSIST OF HARD, DENSE, DURABLE STONE, ANGULAR IN SHAPE AND RESISTANT TO WEATHERING. ROUNDED STONE (i.e.
RIVER ROCK AND COBBLES) SHALL NOT BE USED. THE STONES SHALL BE A MINIMUM OF 3" AND A MAXIMUM OF 6" DIAMETER. THE STONES SHALL HAVE A SPECIFIC
GRAVITY OF AT LEAST 2.6. CONTROL OF GRADATION WILL BE BY VISUAL INSPECTION.
ANY CRACKED OR DAMAGED CURB AND GUTTER AND SIDEWALK SHALL BE REPLACED BY CONTRACTOR.
INSTALLATION NOTES:
1.
2.
3.
4.
CONTRACTOR SHALL INSPECT VEHICLE TRACKING CONTROL PAD DAILY. ROCK SURFACE SHALL BE CLEAN AND LOOSE ENOUGH TO RUT SLIGHTLY UNDER WHEEL
LOADS AND CAUSE LOOSE ROCK TO DISLODGE MUD FROM TIRES. WHEN ROCK BECOMES COMPACTED OR FILLED WITH SEDIMENT SO THAT THE EFFECTIVENESS OF
THE PAD IS DIMINISHED, CONTRACTOR SHALL RIP, TURN OVER, OR OTHERWISE LOOSEN ROCK, PLACE ADDITIONAL NEW ROCK, OR REPLACE WITH NEW ROCK AS
NECESSARY TO RESTORE EFFECTIVENESS.
SEDIMENT AND OTHER MATERIAL SPILLED, DROPPED OR TRACKED ONTO PAVED SURFACES SHALL BE REMOVED IMMEDIATELY OR BY THE END OF EACH WORKING
DAY.
VEHICLE TRACKING CONTROL PAD SHALL BE REMOVED AT THE END OF CONSTRUCTION. THE AREA SHOULD BE TOPSOILED, SEEDED, CRIMPED, AND MULCHED OR
OTHERWISE STABILIZED.
MAINTENANCE NOTES:
1.
2.
3.
CONSTRUCTION FENCE, TYP., TO DISCOURAGE
VEHICLE ACCESS EXCEPT AT VTC
SIGN "CONSTRUCTION ENTRANCE"
R=5'
20' MIN.
3" - 6" ROCK
NO MATERIALS INCLUDING 2x4'S, PIPES,
DIRT, GRAVEL OR ASPHALT, SHALL BE
PLACED IN GUTTER TO FACILITATE
STORMWATER MANAGEMENT PLAN (SWMP)
HANSON SUBDIVISION
Fort Collins, CO
April 17, 2019
Prepared for:
Jeff Mark
Lorson South Land Corp
212 N. Wahsatch Ave, Suite 301
Colorado Springs, CO 80903
Prepared by:
301 North Howes Street, Suite 100
Fort Collins, Colorado 80521
Phone: 970.221.4158 Fax: 970.221.4159
www.northernengineering.com
Project Number: 911-015
This Drainage Report is consciously provided as a PDF.
Please consider the environment before printing this document in its entirety.
When a hard copy is absolutely necessary, we recommend double-sided printing.
April 17, 2019
Lorson South Land Corp
212 N. Wahsatch Ave, Suite 301
Colorado Springs, CO 80903
RE: Stormwater Management Plan
Hanson Subdivision
To Whom It May Concern:
Northern Engineering Services, Inc. is pleased to submit this Stormwater Management Plan for the
Hanson Subdivision project. This report outlines Best Management Practices (BMPs) to be
implemented with the proposed construction in order to minimize potential pollutants in stormwater
discharges. Hanson Subdivision project SWMP does not address what to do in the case that
contaminated soil or groundwater is discovered. For information regarding the procedures used to
treat contaminated soil and ground water refer to the “Soils Management Plan” provided by
National Inspection Services.
We have prepared this report to accompany the Colorado Department of Public Health and
Environment General Permit for Stormwater Discharge Associated with Construction Activities (aka,
Stormwater Discharge Permit or SDP). The General Permit No. for this SDP is (to be filled-in by
permittee) and the Certification No. for this SDP is (to be filled-in by permittee). The Permit
Certification is Effective beginning (to be filled-in by permittee), and initial certification expires (to be
filled-in by permittee). A copy of the issuance cover letter can be found in the Appendix D of this
document (to be provided by permittee).
Please note: this Stormwater Management plan (including the Site Maps) is not a static document.
It is a dynamic device that should be kept current and logged as construction takes place. As such,
this version was prepared to facilitate initial plan approvals and permitting, but does not necessarily
reflect the final version, or the transitions throughout the construction process. As the site develops
and changes, the Contractor is expected and encouraged to make changes to what is contained
herein so that the SWMP works as effectively and efficiently as possible. It shall be the
responsibility of the SWMP Administrator and/or the permit holder (or applicant thereof) to ensure
the plan is properly maintained and followed.
If you should have any questions or comments as you review this report, please feel free to contact
us at your convenience.
Sincerely,
NORTHERN ENGINEERING SERVICES, INC.
Mason Ruebel, EI
Project Engineer
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan
TABLE OF CONTENTS
Vicinity Map
1.0 General Requirements ................................................................................................ 1
1.1 Objectives .................................................................................................................. 1
1.2 SMWP Availability ...................................................................................................... 1
1.3 Definitions.................................................................................................................. 1
1.4 Additional Permitting ................................................................................................... 1
2.0 Narrative Site Description ........................................................................................... 2
2.1 Existing Site Description .............................................................................................. 2
2.2 Nature of Construction Activity ..................................................................................... 2
2.3 Sequence of Major Activities ......................................................................................... 2
2.4 Site Disturbance ......................................................................................................... 2
2.5 Wind and Rainfall Erodibility ........................................................................................ 2
2.6 Existing Data .............................................................................................................. 2
2.7 Existing Vegetation ...................................................................................................... 3
2.8 Potential Pollution Sources ........................................................................................... 3
2.9 Non-stormwater discharges .......................................................................................... 4
2.10 Receiving Waters ........................................................................................................ 4
2.11 SWMP Administrator ................................................................................................... 4
2.12 Best Management Practices (BMP’s) for Stormwater Pollution Prevention.......................... 4
2.13 Structural Practices for Erosion and Sediment Control ..................................................... 5
2.14 Phased BMP Installation .............................................................................................. 5
2.15 Non-Structural Practices for Erosion and Sediment Control .............................................. 8
2.16 Material Handling and Spill Prevention ........................................................................ 10
2.17 Dedicated Concrete or Asphalt Batch Plant .................................................................. 11
2.18 Vehicle Tracking Control ............................................................................................ 11
2.19 Waste Management and Disposal ............................................................................... 11
2.20 Groundwater and Stormwater Dewatering .................................................................... 11
3.0 Final Stabilization and Long-Term Stormwater Management ........................................ 12
3.1 Final Stabilization ..................................................................................................... 12
3.2 Long-Term Stormwater Management ........................................................................... 12
4.0 Inspection, Maintenance and Record Keeping ............................................................. 13
4.1 BMP Inspection ........................................................................................................ 13
4.2 BMP Maintenance .................................................................................................... 13
4.3 Record Keeping ........................................................................................................ 13
5.0 Additional SWMP and BMP Resources ....................................................................... 15
References 16
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan
LIST OF TABLES:
Table 1 - Native Grass Seed Mix ......................................................................................... 12
APPENDICES:
APPENDIX A – Site Maps
APPENDIX B – Erosion Control Details
APPENDIX C – Landscape Plan
APPENDIX D – Copies of Permits/Applications
APPENDIX E – Inspection Logs
APPENDIX F – Contractor Inserts (as needed)
APPENDIX G – Contractor Inserts (as needed)
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 1
1.0 General Requirements
1.1 Objectives
The objective of a Stormwater Management Plan (SWMP) is to identify all potential sources of
pollution likely to occur as a result of construction activity associated with the site construction, and
to describe the practices that will be used to reduce the pollutants in stormwater discharges from
the site. The SWMP must be completed and implemented at the time the project breaks ground,
and revised as necessary as construction proceeds to accurately reflect the conditions and practices
at the site.
This report summarizes the Stormwater Management Plan for the construction activity that will
occur with Hanson Subdivision in Fort Collins, CO. This plan has been prepared according to
regulations of the Colorado Department of Public Health and Environment (CDPHE), Water Quality
Control Division.
1.2 SMWP Availability
This report is intended to remain on the aforementioned construction site to allow for maintenance
and inspection updates, and for review during inspection.
1.3 Definitions
BMP – Best Management Practice encompassing a wide range of erosion and sediment control
practices, both structural and non-structural in nature, which are intended to reduce or eliminate
any possible water quality impacts from stormwater leaving a construction site.
Erosion Control BMPs – Practices that PREVENT the erosion of soil, such as minimizing the amount
of disturbed area through phasing, temporary stabilization, and preserving existing vegetation.
Sediment Control BMP’s – Practices to REMOVE sediment from runoff, such as sediment basins,
silt fence, or inlet protection.
Non-structural BMP’s – The implementation of methods, practices, and procedures to minimize
water quality impacts, such as the preservation of natural vegetation, preventive maintenance and
spill response procedures.
Structural BMP’s – Physical devices that prevent or minimize water quality impacts, such as
sediment basins, inlet protection, or silt fence.
1.4 Additional Permitting
As mentioned above, this Stormwater Management Plan is associated with the Colorado
Department of Public Health and Environment Stormwater Permit that is issued by the Water
Quality Control Division of the CDPHE. Additional Environmental permitting not described in this
report may be required as a part of this project. An example is the Construction Dewatering Permit
for groundwater. Another example is the Air Pollution Emission Notice (APEN). The CDPHE
website contains links to both of these permits, as well as many other potential permits. The
Contractor is responsible for ensuring the proper permits are acquired.
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 2
2.0 Narrative Site Description
2.1 Existing Site Description
The project site is located in the northeast quarter of Section 7, Township 6 North, Range 68 West
of the 6th Principal Meridian, City of Fort Collins, County of Larimer, State of Colorado. The project
site is located northwest of the intersection of South Timberline Road and Zephyr Road in Fort
Collins, Colorado. The site is bounded to the north by the Mail Creek Ditch, to the south and west
by a lateral of the Mail Creek Ditch, and the east by South Timberline Road.
2.2 Nature of Construction Activity
The project will include the construction of single family attached and single family detached lots.
Improvements include streets, curb and gutter, sidewalks, multiple detention ponds, and trails. Each
residence will require the installation of the water and sewer services. The grading of the property will
require the installation of multiple storm sewers with associated inlets.
2.3 Sequence of Major Activities
To complete the project, many basic categories of construction activity will take place. The first
part will be the removal of the current top soil. This will be followed by utility and storm line
installations and simultaneously foundation excavation will begin. Vertical construction of the
building will commence after foundation and underground work is complete. New curb/gutter,
paving, and sidewalks are expected to begin after the building is in and trades move inside. The
final stages of site construction will be fine grading of the areas around the building and landscaping
throughout the project. The aforementioned sequencing is an initial best guess and is subject to
change at the Contractor’s discretion.
2.4 Site Disturbance
The site disturbance will occur across roughly 68.4 acres. It is recommended that existing site
condition photos be taken prior to the demolition.
2.5 Wind and Rainfall Erodibility
The site is located within a moderate risk Erodibility Zone per the City of Fort Collins Wind
Erodibility Map. According to the Natural Resources Conservation Service website -
www.websoilsurvey.nrcs.usda.gov, the averaged soil erosion factor (K), which indicates the
susceptibility of a soil to sheet and rill erosion, is 0.32. This value is indicative of soils moderately
susceptible to rainfall erosion.
Impervious area (i.e., roof area, concrete walks and asphalt parking area) and landscaping will
permanently stabilize the areas disturbed by the proposed construction activity; therefore, the
likelihood of erosion and sediment problems occurring on-site is minimal. During the interim period,
in which the disturbed areas are open, the BMPs described herein were selected to prevent erosion
and limit sediment migration.
2.6 Existing Data
In order to complete the associated construction plans, a topographical survey of the site was
completed. This survey consisted of field measurements made by Northern Engineering in March,
2004 and additional survey in May, 2017.
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 3
In addition to the field survey, the Natural Resources Conservation Service (NRCS) Soil Survey was
used to determine existing soil types found on-site. According to the NRCS Soil Survey, the site
consists of Nunn clay loam and Caruso clay loam, which fall into Hydrologic Soil Groups C and D,
respectively. These groups have a low infiltration rate.
2.7 Existing Vegetation
The existing site vegetation consists primarily of native and non-native grasses. These grasses
naturally grow in clumps, which inevitably leads to some bare areas. The site has approximately
100% vegetative cover, which allows minimum ground erosion. It is highly recommended that pre-
construction photos be taken to clearly document vegetative conditions prior any disturbance
activities.
2.8 Potential Pollution Sources
As is typical with most construction sites, there are a number of potential pollution sources which
could affect water quality. It is not possible for this report to identify all materials that will be used
or stored on the construction site. It is the sole responsibility of the Contractor to identify and
properly handle all materials that are potential pollution sources. The following are some common
examples of potential pollution sources:
• Exposed and stored soils
• Management of contaminated soils
• Off-site tracking of soils and sediment
• Loading and unloading operations
• Outdoor storage of building materials, fertilizers, chemicals, etc.
• Vehicle and equipment maintenance and fueling
• Significant dust or particulate generating processes
• Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, oils, etc.
• On-site waste disposal practices (waste piles, dumpsters, etc.)
• Concrete truck/equipment washing
• Non-industrial waste sources that may be significant, such as worker trash and portable toilets
• Uncovered trash bins
• Other areas or procedures where potential spills can occur
• Stockpiling of materials that can be transported to receiving waterway(s)
Management of Contaminated Soils: We are aware of on-site contaminated soils. A “Soils
Management Plan” has been provided by the National Inspection Services for this site which has
identified petroleum products, coal tar, and pitch and light oil, and municipal solid waste being
found in the site soil. Should the Contractor encounter any of these contaminants they are to use
the “Soils Management Plan” for proper procedures on handling of contaminated soils on the site.
Loading and Unloading Operations: As site development and building construction progresses,
space constraints will limit the number of on-site locations for loading and unloading activities to
the building from Perennial Lane. The contractor will be responsible for the proper handling and
management of pollution sources during loading and unloading operations.
Dedicated Asphalt and Concrete Batch Plants: Neither a dedicated asphalt or concrete batch plant
will be constructed on-site.
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 4
2.9 Non-stormwater discharges
The Stormwater Construction Permit only covers discharges composed entirely of stormwater.
Emergency firefighting water is the only authorized exception. Concrete Washout water can NOT be
discharged to surface waters or to storm sewer systems without separate permit coverage. The
discharge of Concrete Washout water to the ground, under specific conditions, may be allowed by
the Stormwater Construction Permit when appropriate BMPs are implemented.
The discharge of pumped stormwater, ONLY, from excavations, ponds, depressions, etc. to surface
waters, or to a municipal storm sewer system is allowed by the Stormwater Construction Permit, as
long as the dewatering activity and associated BMPs are identified in the Stormwater Management
Plan (SWMP) and are implemented in accordance with the SWMP.
Aside from the exceptions noted above, non-stormwater discharges must be addressed in a separate
permit issued for that discharge. If groundwater is encountered, and dewatering is required, a
Construction Dewatering Permit must be acquired from the Colorado Department of Public Health
and Environment.
2.10 Receiving Waters
The existing property historically drains toward the east side of the property at a low point in
Timberline Road. Stormwater runoff generated with the proposed site will drain to an existing storm
drain in Zephyr Road. That existing storm drain flows to the east to an existing outfall ditch located
on the southern property line of the Timbers Subdivision. From there the ditch discharges into Fossil
Creek Reservoir.
2.11 SWMP Administrator
A SWMP Administrator must be designated in conjunction with the Stormwater Permit. This person
shall be responsible for developing, implementing, maintaining, and revising the SWMP. The
SWMP Administrator will also be the contact for all SWMP-related issues and will be the person
responsible for the accuracy, completeness, and implementation of the SWMP. The Administrator
should be a person with authority to adequately manage and direct day-to-day stormwater quality
management activities at the site.
The SWMP Administrator for this site is:
Name: (to be filled-in by permittee)
Company: (to be filled-in by permittee)
Phone: (to be filled-in by permittee)
E-mail: (to be filled-in by permittee)
2.12 Best Management Practices (BMP’s) for Stormwater Pollution Prevention
Beginning from mobilization, and throughout the entire construction of the project, erosion control
devices shall be installed to ensure minimal pollutant migration. These erosion control devices may
be installed in phases, or not at all, depending on actual conditions encountered at the site. It is
the responsibility of the Contractor to make the determination as to what practices should be
employed and when. In the event that a review agency deems BMPs to be insufficient, it shall be
the responsibility of the contractor to implement modifications as directed.
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 5
Best Management Practices (BMPs) are loosely defined as a method, activity, maintenance
procedure, or other management practice for reducing the amount of pollution entering a water
body. The term originated from rules and regulations in Section 208 of the Clean Water Act.
Details for Structural and Non-Structural BMPs have been included in Appendix B. These details
should be used for additional information on installation and maintenance of BMPs specified in this
report. It is also intended to serve as a resource for additional BMPs that may be appropriate for
the site that have not specifically been mentioned in the report.
2.13 Structural Practices for Erosion and Sediment Control
Structural BMPs are physical devices that are implemented to prevent erosion from happening or to
limit erosion once it occurs. These devices can be temporary or permanent, and installation of
individual components will vary depending on the stage of construction.
A table depicting construction sequence and BMP application/removal has been placed on the
“Dynamic Site Plan” to help document the implementation of these BMPs. Refer to the Stormwater
Management Plan Static Site Plan in the Appendix for the assumed location of all BMPs.
Construction Details for Temporary BMPs are located in the Appendix for reference.
Again, the final determination for which BMP’s will be installed, where they will be located, and
when they will be installed shall be made by the Contractor, along with all documentation
throughout the construction process.
2.14 Phased BMP Installation
It is important to recognize the four (4) major Development Phases as defined by the State of
Colorado’s Stormwater Discharge Permit (SDP). These four development phases (referred to as
Sequencing by the City of Fort Collins) have been distinguished to aid in the appropriate timing of
installation/implementation of BMPs at different stages of the construction process. These phases
are described as follows:
Phase I – Grading Stage; BMPs for initial installation of perimeter controls
Phase II – Infrastructure Stage; BMPs for utility, paving and curb installation
Phase III – Vertical Construction Stage; BMPs for individual building construction.
Phase IV – Permanent BMPs and final site stabilization.
Included in the back map pockets are five Site Plans: a “Static” Site Plan and four “Dynamic” Site
Plans. The “Static” plan serves to display the overall management plan all at once. However,
proper implementation of BMPs does not occur at once, and certain BMPs may move location in
the construction process; therefore, the “Dynamic” Site Plans are intended for the Contractor to
write in the BMP symbols to document the location and time the BMPs are installed and
maintained throughout the entire construction process.
Silt Fencing (Phase I & II)
Silt fencing shall be provided to prevent migration of sediment off-site or into adjacent properties.
All silt fencing shall be installed prior to any land disturbing activity (demolition, stockpiling,
stripping, grading, etc.). Silt fencing is to be installed prior to site excavation or earthwork
activities.
Inspections of the silt fence should identify tears or holes in the material, and should check for
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 6
slumping fence or undercut areas that allow flows to bypass the fencing. Damaged sections of the
silt fence should be removed to maintain BMP effectiveness, typically before it reaches a depth of 6
inches.
Sediment Control Log – aka “Straw Wattles” and Rock Socks” (Phase I)
A Sediment Control Log is a linear roll made of natural materials, such as straw, coconut fiber, or
other fibrous material trenched into the ground and held with a wooden stake. Sediment Control
Logs can also be made with rocks wrapped in a metal mesh net, which provides more durability in
high traffic areas where they might get ran over or have where there is nowhere to drive a wooden
stake into the ground. Sediment Control Logs can be used in many instances. Examples include
perimeter control for stockpiles, as part of inlet protection designs, as check dams in small drainage
ways, on disturbed slopes to shorten flow lengths, or in lieu of silt fencing (where appropriate).
Sediment Control Logs should be inspected for excess sediment accumulation. Sediment should be
removed prior to reaching half the height of the log.
At a minimum, Sediment Control Logs should be used around soil stockpiles (including landscape
material) and at all stormwater discharge locations other than inlets.
Vehicle Tracking Control Pads (Phase I)
Vehicle tracking control pads shall be provided to minimize tracking of mud and sediment onto
paved surfaces and neighboring roadways. All vehicle tracking control pads shall be installed prior
to any land disturbing activity (demolition – as necessary, stockpiling, stripping, grading, etc.).
Location of vehicle tracking control pads will be located at any and all existing and future vehicle
accesses being used during any of the construction phases. These locations will primarily be
dictated by gates or openings in the temporary construction fencing that is expected to be installed.
Vehicle tracking control pads are to be installed prior to demolition (as appropriate), site excavation
or earthwork activities.
Vehicle tracking pads should be inspected for degradation and aggregate material should be
replaced as needed. If the area becomes clogged with water, excess sediment should be removed.
Aggregate material should remain rough, and at no point should aggregate be allowed to compact in
a manner that causes the tracking pad to stop working as intended.
Suggested locations for vehicle tracking pads are at the proposed access to the site from Timberline
Road.
Inlet Protection (Phase I & II)
Inlet protection shall be provided for existing inlets to prevent sediment transport from adjacent
earthwork disturbance. Installation of these filters shall occur before adjacent earth disturbing
activities (Phase I implementation). Wattle type filters are to be implemented for new and existing
inlets where asphalt does not exist. For these inlets, if pavement is constructed adjacent to the
structure or if the area adjacent to the inlet is changed such that the wattle type filter is no longer
effective, it shall be the responsibility of the Contractor to ensure that an appropriate method is
used instead. For example, the wattle filter could be reused, or a gravel-block inlet filter may be
installed. It will be left to the discretion of the Contractor as to whether replacement of any inlet
filter is necessary.
Inlet protection should be inspected regularly for tears that can result in sediment entering an inlet.
Inlet protection should also be inspected for sediment accumulation upstream of the inlet, and
sediment should be removed when the less than half of the capacity is available, or per
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 7
manufacturer specifications.
The Contractor shall provide inlet protection for all proposed inlets as they are installed (Phase II
implementation).
Erosion Control Blankets (Phase II)
A temporary degradable rolled erosion control product composed of natural flexible fibers shall be
used on all seeded slopes 3:1 and greater (excluding mulched shrub bed areas). Erosion control
blankets should be utilized to provide erosion control and to facilitate vegetation establishment.
During installation, it is important to ensure that no gaps or voids exist under the material and that
all corners of the material are secured using stakes and trenching. Stakes should be made of
materials that are biodegradable. Continuous contact between the product and the soil is necessary
to avoid failure.
Erosion Control Blankets should be inspected regularly for signs of erosion, including beneath the
mat. If voids are apparent, they should be filled with suitable soil. Inspections should also identify
loose or damaged stakes, as well as loose portions of the blanket. If deficiencies are found, they
should be repaired or replaced.
At a minimum, Erosion Control Blankets shall be installed as deemed necessary in areas with
steeper than or equal to 4:1 slope.
Concrete Washout Area (Phase II & III)
A concrete washout should be provided on the site. The washout can be lined or unlined excavated
pits in the ground, commercially manufactured prefabricated containers, or aboveground holding
areas. The concrete washout must be located a minimum of 400 feet from any natural drainage
way or body of water, and at least 1000 feet from any wells or drinking water sources. Washout
areas should not be located in an area where shallow groundwater may be present. Contractor
shall clearly show the desired location and access to the Concrete Washout Area on the Stormwater
Management Plan - Dynamic Site Plan. Contractor shall place a Vehicle Tracking Pad if the
selected location for the Concrete Washout Area is detached from pavement. Clear signage
identifying the concrete washout should also be provided.
The Concrete Washout Area should be inspected regularly. Particular attention should be paid to
signage to ensure that the area is clearly marked. Confirmation that the washout is being used
should also be noted to ensure that other undesignated areas of the site are not being used
incorrectly as a concrete washout.
An appropriate location for the concrete washout area is located to the east of the building and
adjacent to the access on Timberline Road. This location is a suggestion only, and can be relocated
at the discretion of the Contractor.
Permanent/Established Vegetation (Phase IV)
Permanent or established vegetation and landscaping is considered a permanent form of sediment
and erosion control for common open spaces, steep slopes and areas not exposed to prolonged
scour velocities, or acute incipient motion bed shear stresses that will create soil erosion, rill
formation and subsequent sediment transport. Areas where the previous conditions apply will
contain sufficient permanent BMPs, such as riprap or cobble mulch. Permanent vegetation shall
conform to the approved Landscape Plan prepared by Logan Simpson. Permanent/Established
vegetation and hardscape defines Phase IV of development.
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 8
2.15 Non-Structural Practices for Erosion and Sediment Control
Non-Structural BMPs are practices or activities that are implemented to prevent erosion from
happening or to limit erosion once it occurs. These BMPs can be a practice resulting in physical
change to the site, such as mulching or slope stabilization. They can also result in behavioral
changes on the site, such as changes to construction phasing to minimize exposure to weather
elements, or increased employee awareness gained through training.
Protection of Existing Vegetation (Phases I-IV)
Protection of existing vegetation on a construction site can be accomplished through installation of a
construction fence around the area requiring protection. In cases where up-gradient areas are
disturbed, it may also be necessary to install perimeter controls to minimize sediment loading to
sensitive areas such as wetlands.
Trees that are to remain after construction is complete must be protected. Most tree roots grow
within the top 12”-18” of soil, and soil compaction is a significant threat to tree health. As such,
particular care should be taken to avoid activities within the drip-line of the tree. Direct equipment
damage should also be prevented. The most effective way to ensure the health of trees is to
establish a protection zone at the drip-line of the tree to prevent unintended activity in the area
directly surrounding the tree.
Fencing should be inspected and repaired when needed. If damage occurs to a tree, an arborist
should be consulted on how to care for the tree. If a tree is damage beyond repair, the City Forester
should be consulted on remediation measures.
At a minimum, protection to all trees identified for retention on the plans by TB Group.
Stockpile Management (Phases I-III)
Stockpile management should be utilized to minimize erosion and sediment transport from soil
stockpiles. In general, soil stockpiles should be located a minimum of 100 feet from any drainage
way and 50 feet from any storm sewer inlets. Where practical, choose a stockpile location that will
remain undisturbed for the longest period of time as the phases of construction progress. Sediment
control BMPs should be placed around the perimeter of the stockpile, and a designated access point
on the upstream side of the stockpile should be identified. BMPs such as surface roughening,
temporary seeding, mulching, erosion control blankets, or soil binders should be used to stabilize
the stockpile surface.
As a part of stockpile management, regular inspections of the perimeter controls should be
completed. If BMPs have been utilized to stabilize the surface of the stockpile, they should be
inspected and repaired as needed.
While soil stockpiles are not expected with this project, it is possible that foundation excavation or
the delivery landscaping material may generate temporary stockpiles. The location of any such
stockpiles shall be the responsibility of the SWMP Administrator.
Mulching (Phase I-III)
Mulching helps reduce erosion by protecting bare soil from rainfall impact, increasing infiltration,
and reducing runoff. Although often applied in conjunction with temporary or permanent seeding, it
can also be used for temporary stabilization of areas that cannot be reseeded due to seasonal
constraints. The most common type of mulch used is hay or grass that is crimped into the soil to
keep it secure. However, crimping may not be practical on slopes steeper than three to one
(3H:1V).
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 9
The Contractor shall mulch all planted areas within twenty-four (24) hours after planting. Only
weed-free and seed-free straw mulch may be used. Straw mulch should be applied at two (2) tons
per acre, and shall be adequately secured by crimping, tackifier, netting or blankets. Hydraulic
mulching may also be used on steep slopes or where access is limited. In the case that hydraulic
mulching is utilized, the Contractor shall use wood cellulose fibers mixed with water at two
thousands to two thousand five hundred (2,000-2,500) pounds per acre and organic tackifier at
one hundred to four hundred (100-400) pounds per acre.
The Contractor is responsible in applying wood chip mulch to all planted trees and shrubs as shown
on the Landscape Plan prepared by TB Group.
Wind Erosion/Dust Control (Phase I-IV)
Wind Erosion and Dust Control BMP’s help to keep soil particles from entering the air as a result of
land disturbing construction activities. Attached at the end of the Appendix B is the Fort Collins
Dust Prevention and Control Manual. The purpose of this manual is to establish minimum
requirements consistent with nationally recognize BMP’s for controlling fugitive dust emissions and
to describe applicable best management practices to prevent, minimize, and mitigate off-property
transport or off-vehicle transport of fugitive dust emissions pursuant to Chapter 12, Article X of the
Fort Collins City Code (§12-150 et. seq) for specific dust generating activities and sources.
Examples include use of a water truck or irrigation/sprinkler system to wet the top layer of disturbed
soil, seeding and mulching, soil binders, or wind fences.
Street Sweeping (Phases I-IV)
Street sweeping should be used to remove sediment that has been tracked onto adjacent roadways.
Roadways should be inspected at least once a day, and sediment should be removed as needed. A
check of the area inlet protection should be completed after sweeping to ensure nothing was
displaced during sweeping operations. Street sweeping can reduce the sediment washed into the
existing storm drain system. Street sweeping may be necessary on the existing hardscape areas
which receive runoff from the disturbed areas.
Saw Cutting Pollution Prevention (Phase I)
The following protocol is recommended to prevent dust and slurry from asphalt and concrete saw
cutting activities from migrating into the existing storm drain system.
• Slurry and cuttings shall be vacuumed during cutting and surfacing operations
• Slurry and cuttings shall not remain on permanent concrete or asphalt pavement
overnight
• Slurry and cuttings shall not drain to any natural or constructed drainage conveyance
• Collected slurry and cuttings shall be disposed of in a manner that does not violate
groundwater or surface water standards
Good Housekeeping Practices (All phases)
Good housekeeping practices that will prevent pollution associated with solid, liquid, and hazardous
construction-related materials and wastes should be implemented throughout the project.
Examples of good housekeeping include providing an appropriate location for waste management
containers, establishing proper building material staging areas, designating paint and concrete
washout areas, establishing proper equipment/vehicle fueling and maintenance practices.
Development of a spill prevention and response plan is another example of Good Housekeeping
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 10
practices that should be used on the project. The following items are detailed examples of some of
the good housekeeping practices that should be utilized throughout the project. It should be noted
that a complete list of practices and detailed discussion regarding good housekeeping has been
included with Appendix B.
Street Sweeping and Vacuuming – Street sweeping and vacuuming should be used to remove
sediment that has been tracked onto adjacent roadways. Roadways should be inspected at least
once a day, and sediment should be removed as needed. A check of inlet protection should be
completed after sweeping to ensure nothing was displaced during sweeping operations.
Waste Management – Designate trash and bulk waste collection areas on-site. When possible,
materials should be recycled. Hazardous material waste should be segregated from other solid
waste. Waste collection areas should be located away from streets, gutters, watercourses, and
storm drains. Dumpsters should be located near site entrances to minimize traffic on disturbed
soils, and they should be placed on a level soil surface.
Establish Proper Building Material Handling and Staging areas – Clearly designate site areas for
staging and storage of building materials. Provide appropriate BMPs to ensure that spills or leaks
are contained.
Establish Proper Equipment/Vehicle Fueling and Maintenance Practices – If needed, create a
clearly designated on-site fueling and maintenance area that is clean and dry. Provide appropriate
BMPs to ensure that spills or leaks are contained.
2.16 Material Handling and Spill Prevention
Potential pollution sources, as discussed in earlier sections, are to be to be identified by the
Contractor. Spill prevention procedures are to be determined and put in place prior to construction
by the Contractor. A spill and flooding response procedure must also be determined and put in
place prior to construction by the Contractor. Additionally, steps should be taken to reduce the
potential for leaks and spills to come in contact with stormwater runoff, such as storing and
handling toxic materials in covered areas or by storing chemicals within berms or other secondary
containment devices.
A notification procedure must be put in place by the Contractor, by which workers would first notify
the site construction superintendent, who would then notify the SWMP Administrator. Depending
on the severity of the spill, the site construction superintendent and SWMP Administrator would
possibly notify the Colorado Department of Public Health and Environment - Water Quality Control
Division, downstream water users, or other appropriate agencies. The release of any chemical, oil,
petroleum product, sewage, etc., which enter waters of the State of Colorado (which include
surface water, ground water, and dry gullies or storm sewers leading to surface water) must be
reported immediately to the Division’s emergency spill reporting line at (877) 518-5608. All
spills that will require cleanup, even if the spill is minor and does not need to be reported to the
state, should still be reported to the City of Fort Collins Utilities office at 970-221-6700.
While not expected with this project, it will be the responsibility of the Contractor to designate a
fueling area and take the necessary precautions to ensure that no stormwater pollution occurs in the
event that a fueling area is needed. Fueling areas shall be located a minimum 100 feet from all
drainage courses. A 12-inch high compacted earthen ridge capable of retaining potential spills
shall enclose fueling areas. Other secondary containment devices can be used instead of the
earthen ridge. The area shall be covered with a non-porous lining to prevent soil contamination.
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 11
Printed instructions for cleanup procedures shall be posted in the fueling area and appropriate fuel
absorbents shall be available along with containers for used absorbents within the fueling area.
2.17 Dedicated Concrete or Asphalt Batch Plant
There are not any dedicated concrete or asphalt batch plants anticipated with this project. In the
event that a plant is needed, the Contractor should be aware that additional permitting will be
required. In particular, an Air Pollutant Emission Notice (APEN) will need to be obtained from the
CDPHE.
2.18 Vehicle Tracking Control
In addition to the vehicle tracking pads discussed previously, additional measures can be taken to
minimize and control sediment discharges from the site due to vehicle tracking. These measures
can include fencing around the site to control access points. Regular street sweeping can also be
used to minimize the transmission of sediment from the site due to vehicles leaving the site. The
use of gravel parking areas and wash racks can also be implemented to ensure minimal vehicle
tracking from the site.
2.19 Waste Management and Disposal
It will be the responsibility of the Contractor to designate a concrete truck chute washout area and
to clearly identify that area. Detailed information about the design and maintenance of the Concrete
Washout can be found under the Structural Practices section of this report. At no time should
untreated wash water be allowed to discharge from the site or to enter a storm drain system or
stream. Upon completion of construction activities the concrete washout material shall be removed
and properly disposed of prior to the area being restored.
Any waste material that currently exists on the site or that is generated by construction will be
disposed of in such a manner as to not cause pollutants in stormwater discharges. If waste is to be
stored on-site, it shall be in an area located a minimum of 100 feet from all drainage courses.
Whenever waste is not stored in a non-porous container, it shall be in an area enclosed by a 12-
inch high compacted earthen ridge or some other approved secondary containment device. The area
shall be covered with a non-porous lining to prevent soil contamination. Whenever precipitation is
predicted, the waste shall be covered with a non-porous cover, anchored on all sides to prevent its
removal by wind, in order to prevent precipitation from leaching out potential pollutants from the
waste. On-site waste disposal practices, such as dumpsters, should be covered or otherwise
contained as to prevent dispersion of waste materials from wind. It shall also be the responsibility
of the Contractor to maintain a clean jobsite as to prevent dispersion of waste material and potential
pollutants into adjacent properties or waterways.
The location of, and protective measures for, temporary restroom facilities shall be the responsibility
of the SWMP Administrator.
2.20 Groundwater and Stormwater Dewatering
The BMPs selected for construction dewatering vary depending on the site-specific features, such as
soils, topography, discharge quantities, and discharge location. Typically, dewatering involves
pumping water from an inundated area to a BMP, prior to the water being released downstream
into a receiving waterway, sediment basin, or well-vegetated area. Acceptable BMPs included
discharging water into a sediment trap or basin, using a dewatering filter bag, or using a series of
sediment logs. A settlement tank or an active treatment system can also be utilized. Another
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 12
commonly used method to handle the pumped water is the “sprinkler method,” which involves
applying the water to vegetated areas through a perforated discharge hose. Dispersal from a water
truck for dust control can also be used to disperse the pumped water.
3.0 Final Stabilization and Long-Term Stormwater Management
3.1 Final Stabilization
All disturbed areas will be seeded, crimped and mulched. Soil amendments must comply with the
requirements found in City Municipal Code Sections 12-130, 12-131, and 12-132 (refer also to
Land Use Code 3.8.21).
Steps to Amend the Soil (Source: City Code Sections 12-130, 12-131, and 12-132):
• Loosen the top 8 inches
• Till or mix 3 cubic yards of amendment/1000 square feet into the top 6 inches of soil or
• Add 4 inches of topsoil that meets the following requirements:
Topsoil Requirements
Sand 20 - 75%
Silt 5 - 60%
Clay 5 - 30%
Organic Material 5% or more
pH 6.0 - 8.0
As defined by the Colorado Department of Public Health and Environment (CDPHE) in the General
Permit Application for Stormwater Discharges, “Final stabilization is reached when all soil disturbing
activities at the site have been completed, and uniform vegetative cover has been established with a
density of at least 70 percent of pre-disturbance levels or equivalent permanent, physical erosion
reduction methods have been employed.”
Table 1 - Native Grass Seed Mix
Preferred
Varieties
Seeded Rate
(lbs. per acre,
drilled)
PLS
Seeded/acre
Leymus Cinereus Great Basin Wilrye Mangar 3 285,000
Nassella Viridula Green Needlegrass Lodorm 2 362,000
Chnatherum Hymenoides Indian Ricegrass Paloma, Nezpar 1 188,000
Elymus Trachycaulus Slender Wheatgrass Primar, Revenue 2 320,000
Elymus Lanceolatus Thickspike Wheatgrass Critana 3 580,500
Pascopyrum Smithii Western Wheatgrass Arriba, Barton 4 504,000
Totals 15 2,239,500
Species
3.2 Long-Term Stormwater Management
The method of long-term stormwater management will take place at the proposed rain garden and
extended detention pond. All disturbed areas will receive permanent paving or will be vegetated per
the Landscape Plan.
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 13
4.0 Inspection, Maintenance and Record Keeping
4.1 BMP Inspection
All temporary erosion control facilities shall be inspected at a minimum of once every two (2) weeks
and after each significant storm event or snowmelt. Repairs or reconstruction of BMPs, as
necessary, shall occur as soon as possible in order to ensure the continued performance of their
intended function. It is the responsibility of the SWMP Administrator to conduct bi-weekly
inspections, maintain BMPs if needed, to keep records of site conditions and inspections, and to
update the SWMP as necessary.
The construction site perimeter, disturbed areas, all applicable/installed erosion and sediment
control measures, and areas used for material storage that are exposed to precipitation shall be
inspected for evidence of, or the potential for, pollutants entering the drainage system. Erosion and
sediment control measures identified in the SWMP shall be observed to ensure that they are
operating correctly. Attention should be paid to areas that have a significant potential for
stormwater pollution, such as demolition areas, concrete washout locations, and vehicle entries to
the site. The inspection must be documented to ensure compliance with the permit requirements.
4.2 BMP Maintenance
Any BMP’s not operating in accordance with the SWMP must be addressed as soon as possible,
immediately in most cases, to prevent the discharge of pollutants. If modifications are necessary,
such modifications shall be documented so that the SWMP accurately reflects on-site conditions.
The SWMP needs to accurately represent field conditions at all times.
Uncontrolled releases of mud, muddy water, or measurable amounts of sediment found off-site will
be recorded with a brief explanation of the measures taken to clean-up the sediment that has left
the site, as well as the measures taken to prevent future releases. This record shall be made
available to the appropriate public agencies (Colorado Department of Public Health and
Environment, Water Quality Control Division; Environmental Protection Agency; City of Fort Collins;
etc.) upon request.
Preventative maintenance of all temporary and permanent erosion control BMPs shall be provided
in order to ensure the continued performance of their intended function. Temporary erosion control
measures are to be removed after the site has been sufficiently stabilized as determined by the City
of Fort Collins. Maintenance activities and actions to correct problems shall be noted and recorded
during inspections.
Inspection and maintenance procedures specific to each BMP identified with this SWMP are
discussed in Section 3. Details have also been included with Appendix B.
4.3 Record Keeping
Documentation of site inspections must be maintained. The following items are to be recorded and
kept with the SWMP:
• Date of Inspection
• Name(s) and title(s) of personnel making the inspection
• Location(s) of sediment discharges or other pollutants from the site
• Location(s) of BMP’s that need to be maintained
• Location(s) of BMP’s that failed to operate as designed or proved inadequate
• Locations(s) where additional BMP’s are needed that were not in place at the time of inspection
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 14
• Deviations from the minimum inspection schedule
• Descriptions of corrective action taken to remedy deficiencies that have been identified
• The report shall contain a signed statement indicating the site is in compliance with the permit to the
best of the signer’s knowledge and belief after corrective actions have been taken.
Provided within Appendix E of this SWMP is an Example Inspection Log to aid in the record keeping
of BMP inspections and maintenance. Photographs, field notebooks, drawings and maps should be
included by the SWMP Administrator when appropriate.
In addition to the Inspection Log, records should be kept documenting:
• BMP maintenance and operation
• Stormwater contamination
• Contacts with suppliers
• Notes on the need for and performance of preventive maintenance and other repairs
• Implementation of specific items in the SWMP
• Training events (given or attended)
• Events involving materials handling and storage
• Contacts with regulatory agencies and personnel
• Notes of employee activities, contact, notifications, etc.
Records of spills, leaks, or overflows that result in the discharge of pollutants must be documented
and maintained. A record of other spills that are responded to, even if they do not result in a
discharge of pollutants, should be made. Information that should be recorded for all occurrences
includes the time and date, weather conditions, reasons for the spill, etc. Some spills may need to
be reported to authorities immediately. Specifically, a release of any chemical, oil, petroleum
product, sewage, etc., which may enter waters of the State of Colorado (which include surface
water, ground water and dry gullies or storm sewers leading to surface water) must be reported to
the CDPHE.
Additionally, the “Dynamic Site Plan” is intended to be a “living” document where the SWMP
Administrator can hand write the location of BMPs as they are installed to appropriately reflect the
current site conditions. Also on the “Dynamic Site Plan” is a “Table of Construction Sequence and
BMP Application/Removal” that the SWMP Administrator can use to document when BMPs were
installed or removed in conjunction with construction activities. These items have been included as
an aid to the SWMP Administrator, and other methods of record keeping are at his or her discretion.
This Stormwater Management Plan (both the text and map) is not a static document. It
is a dynamic device intended to be kept current and logged as construction takes place.
It shall be the responsibility of the SWMP Administrator and/or the permit holder (or
applicant thereof) to ensure the plan is properly maintained and followed. Diligent
administration is critical, including processing the Notice to Proceed and noting on the
Stormwater Management Plan the dates that various construction activities occur and
respective BMPs are installed and/or removed.
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 15
5.0 Additional SWMP and BMP Resources
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual - Volume 3 “Best Management Practices”
Colorado Department of Transportation
Erosion Control and Stormwater Quality Guide
BMP Field Academy
EPA Menu of BMP’s
Construction Site Storm Water Runoff Control
International Stormwater Best Management (BMP) Database
Rocky Mountain Education Center
Rocky Mountain Education Center
Red Rocks Community College, Lakewood
Keep It Clean Partnership
Boulder
ADDRESS:
200 S. College Ave. Suite 10
Fort Collins, CO 80524
PHONE: 970.221.4158
FAX: 970.221.4159
WEBSITE:
www.northernengineering.com
Hanson Subdivision
Stormwater Management Plan 16
References
1. Final Drainage Report for Hanson Subdivision, Northern Engineering Services, April 17,
2019 (NE Project No. 911-015)
2. Soil Resource Report for Larimer County Area, Colorado, Natural Resources
Conservation Service, United States Department of Agriculture.
3. Urban Storm Drainage Criteria Manual, Volumes 1-3, Urban Drainage and Flood Control
District, Water Resources Publications, LLC., Denver, Colorado, Updated November
2010.
APPENDIX A
SITE MAPS
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12" W
12" W
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TELE
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APPENDIX B
EROSION CONTROL DETAILS
Sheet
of 69
HANSEN SUBDIVISION These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
301 North Howes Street, Suite 100
Fort Collins, Colorado 80521
E NGINEER ING
N O R T H E RN
PHONE: 970.221.4158
www.northernengineering.com
EC2
EROSION CONTROL DETAILS
69
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
Call before you dig.
R
VEHICLE TRACKING CONTROL PAD SHALL BE LOCATED AT EVERY ACCESS POINT TO THE CONSTRUCTION SITE.
A SIGN SHALL BE PLACED NEXT TO THE VEHICLE TRACKING CONTROL PAD TO DESIGNATE THE LOCATION AS THE CONSTRUCTION ENTRANCE/EXIT.
VEHICLE TRACKING CONTROL PADS SHALL CONSIST OF HARD, DENSE, DURABLE STONE, ANGULAR IN SHAPE AND RESISTANT TO WEATHERING. ROUNDED STONE (i.e.
RIVER ROCK AND COBBLES) SHALL NOT BE USED. THE STONES SHALL BE A MINIMUM OF 3" AND A MAXIMUM OF 6" DIAMETER. THE STONES SHALL HAVE A SPECIFIC
GRAVITY OF AT LEAST 2.6. CONTROL OF GRADATION WILL BE BY VISUAL INSPECTION.
ANY CRACKED OR DAMAGED CURB AND GUTTER AND SIDEWALK SHALL BE REPLACED BY CONTRACTOR.
INSTALLATION NOTES:
1.
2.
3.
4.
CONTRACTOR SHALL INSPECT VEHICLE TRACKING CONTROL PAD DAILY. ROCK SURFACE SHALL BE CLEAN AND LOOSE ENOUGH TO RUT SLIGHTLY UNDER WHEEL
LOADS AND CAUSE LOOSE ROCK TO DISLODGE MUD FROM TIRES. WHEN ROCK BECOMES COMPACTED OR FILLED WITH SEDIMENT SO THAT THE EFFECTIVENESS OF
THE PAD IS DIMINISHED, CONTRACTOR SHALL RIP, TURN OVER, OR OTHERWISE LOOSEN ROCK, PLACE ADDITIONAL NEW ROCK, OR REPLACE WITH NEW ROCK AS
NECESSARY TO RESTORE EFFECTIVENESS.
SEDIMENT AND OTHER MATERIAL SPILLED, DROPPED OR TRACKED ONTO PAVED SURFACES SHALL BE REMOVED IMMEDIATELY OR BY THE END OF EACH WORKING
DAY.
VEHICLE TRACKING CONTROL PAD SHALL BE REMOVED AT THE END OF CONSTRUCTION. THE AREA SHOULD BE TOPSOILED, SEEDED, CRIMPED, AND MULCHED OR
OTHERWISE STABILIZED.
MAINTENANCE NOTES:
1.
2.
3.
CONSTRUCTION FENCE, TYP., TO DISCOURAGE
VEHICLE ACCESS EXCEPT AT VTC
SIGN "CONSTRUCTION ENTRANCE"
R=5'
20' MIN.
3" - 6" ROCK
NO MATERIALS INCLUDING 2x4'S, PIPES,
DIRT, GRAVEL OR ASPHALT, SHALL BE
PLACED IN GUTTER TO FACILITATE
APPENDIX C
LANDSCAPE PLAN
APPENDIX D
COPIES OF PERMITS/APPLICATIONS
APPENDIX E
INSPECTION LOGS
APPENDIX F
CONTRACTOR INSERTS
APPENDIX G
CONTRACTOR INSERTS
Project Number: 911-015 Location: Fort Collins, CO
Date: April 17, 2019 Total Acres: 68.40
EROSION CONTROL MEASURE Units
Estimated
Quantity
Unit
Price
Total
Price
each 9 $350.00 $3,150.00
Outlet Protection each 4 $500.00 $2,000.00
Straw Wattle LF 50 $5.00 $250.00
each 32 $125.00 $4,000.00
each 2 $1,300.00 $2,600.00
each 2 $1,200.00 $2,400.00
Erosion Control Blanket sq. yd. 2000 $3.00 $6,000.00
acre 29.5 $1,000.00 $29,500.00
TOTAL = $49,900.00
TOTAL = $74,850.00
TOTAL = $102,600.00
REQUIRED AMOUNT OF SECURITY = $102,600.00
NOTE: 'Total Acres' represents total disturbed area.
(WHICHEVER IS GREATER)
Hanson Subdivision
Erosion Control Cost Estimate
Vehicle Tracking Control Pads
AMOUNT OF SECURITY = 1.5 x $49,900.00
Rock Socks
Vegetate Landscaped Areas
Inlet Protection
Concrete Washout Area
- OR -
COST TO VEGETATE: TOTAL ACRES x ($1000/acre) x 1.5
=
=
D:\Projects\911-015\Drainage\Erosion\911-015_Erosion-Escrow-Estimate.xls
MOUNTING CURB; HOWEVER, CURB MAY BE
CUT DOWN TO A HEIGHT OF 2" OR HIGHER
FOR EASIER ACCESS AND REPLACED AT
PROJECT COMPLETION. OTHER ACCESS
DEVICES MAY BE USED AS ACCEPTED BY
THE CITY.
CURB CUT
50' MIN.
2" MIN. 6" MIN.
6" MIN.
ALTHOUGH NOT NORMALLY USED, THE CITY RESERVES THE RIGHT TO REQUIRE VEHICLE TRACKING CONTROL WITH A TEMPORARY CATTLE GUARD
AND/OR WHEEL WASH FACILITIES AT SITES WHERE TRACKING ONTO PAVED AREAS BECOMES A SIGNIFICANT PROBLEM AS DETERMINED BY THE CITY
INSPECTOR.
IF VEHICLE TRACKING CONTROL WITH WHEEL WASH FACILITIES ARE REQUIRED, ALL WHEELS ON EVERY VEHICLE LEAVING THE SITE SHALL BE
CLEANED OF MUD USING A PRESSURE-WASHER. THE CONTRACTOR SHALL BE RESPONSIBLE FOR OBTAINING A WATER SOURCE AND CONSTRUCTING
A WASHWATER SEDIMENT TRAP.
5.
6.
IF VEHICLE WHEEL WASH FACILITIES ARE REQUIRED, CONTRACTOR SHALL INSPECT VEHICLE TRACKING CONTROL AND WHEEL WASH FACILITIES DAILY.
ACCUMULATED SEDIMENTS SHALL BE REMOVED FROM THE PAD SURFACE.
ACCUMULATED SEDIMENT IN THE WASHWATER/SEDIMENT TRAP SHALL BE REMOVED WHEN THE SEDIMENT REACHES AN AVERAGE DEPTH OF 12-INCHES.
4.
5.
VTC
IP
IP
001 CONCRETE WASHOUT AREA
003 ROCK SOCK DETAIL 004 VEHICLE TRACKING CONTROL PAD
008 CURB INLET PROTECTION
007 AREA INLET FILTER GRAVEL
ROCK SOCK SECTION ROCK SOCK PLAN
ROCK SOCK JOINTING
ROCK SOCK INSTALLATION NOTES
1. SEE PLAN VIEW FOR:
- LOCATION (S) OF ROCK SOCKS.
2. CRUSHED ROCK SHALL BE 11
2" (MINUS) IN SIZE WITH A FRACTURED FACE (ALL SIDES) AND SHALL COMPLY WITH
GRADATION SHOWN ON THIS SHEET (11
2" MINUS).
3. WIRE MESH SHALL BE FABRICATED OF 10 GAGE POULTRY MESH, OR EQUIVALENT, WITH A MAXIMUM OPENING OF
1
2", RECOMMENDED MINIMUM ROLL WIDTH OF 48".
4. WIRE MESH SHALL BE SECURED USING "HOG RINGS" OR WIRE TIES AT 6" CENTERS ALONG ALL JOINTS AND AT 2"
CENTERS ON ENDS OF SOCKS.
5. SOME MUNICIPALITIES MAY ALLOW THE USE OF FILTER FABRIC AS AN ALTERNATIVE TO WIRE MESH FOR THE
ROCK ENCLOSURE.
GRADATION TABLE
SIEVE SIZE
MASS PERCENT
PASSING SQUARE
MESH SIEVES
NO. 4
2" 100
1-1/2" 90-100
1" 20-55
3/4" 0-15
3/8" 0-5
MATCHES SPECIFICATIONS FOR NO. 4 COARSE AGGREGATE FOR
CONCRETE PER AASHTO M43. ALL ROCK SHALL BE FRACTURED FACE,
ALL SIDES
WIRE ENCLOSED 1 1/2"
WASHED ROCK
2'
RS
005 SILT FENCE/PERIMETER PROTECTION
POSTS
PREASSEMBLED SILT FENCE POSTS SHALL OVERLAP
AT JOINTS SO THAT NO
GAPS EXIST IN SILT FENCE.
NOTE:
THICKNESS OF GEOTEXTILE
POST SHALL BE JOINED AS SHOWN, THEN HAS BEEN EXAGGERATED.
ROTATED 180° IN DIRECTION SHOWN AND
DRIVEN INTO THE GROUND.
SILT FENCE JOINTS
DRIVE POSTS VERTICALLY INTO THE GROUND TO A MINIMUM DEPTH OF 18".
EXCAVATE A TRENCH APPROXIMATELY 4" WIDE AND 4" DEEP ALONG THE
LINE OF POSTS AND UPSLOPE FROM THE BARRIER.
ANCHOR TRENCH SHALL BE EXCAVATED BY HAND, WITH TRENCHER, OR
WITH SILT FENCE INSTALLATION MACHINE. NO ROAD GRADERS, BACKHOES,
ETC. SHALL BE USED.
NOT LESS THAN THE BOTTOM 1' OF THE SILT FENCE FABRIC SHALL BE
BURIED IN THE TRENCH.
THE TRENCH SHALL BE COMPACTED BY HAND, WITH "JUMPING JACK" OR BY
WHEEL ROLLING. COMPACTION SHALL BE SUCH THAT THE SILT FENCE
RESISTS BEING PULLED OUT OF ANCHOR TRENCH BY HAND.
SILT FENCE INDICATED IN THE PLANS SHALL BE INSTALLED PRIOR TO ANY
LAND-DISTURBING ACTIVITIES.
USE WOOD POSTS OR OTHER MATERIAL AS ACCEPTED BY THE CITY.
INSTALLATION NOTES:
1.
2.
3.
4.
5.
6.
7.
THE CONTRACTOR SHALL INSPECT SILT FENCE EVERY TWO WEEKS AND
AFTER SIGNIFICANT STORM EVENTS AND MAKE REPAIRS OR CLEAN OUT
UPSTREAM SEDIMENT AS NECESSARY.
SEDIMENT ACCUMULATED UPSTREAM OF SILT FENCE SHALL BE REMOVED
WHEN THE UPSTREAM SEDIMENT REACHES A DEPTH OF 6".
SILT FENCE SHALL BE REMOVED WHEN THE UPSTREAM DISTURBED AREA IS
STABILIZED AND GRASS COVER IS ACCEPTED BY THE CITY. IF ANY
DISTURBED AREA EXISTS AFTER REMOVAL, IT SHALL BE SEEDED AND
MULCHED OR OTHERWISE STABILIZED IN A MANNER ACCEPTED BY THE CITY.
MAINTENANCE NOTES:
1.
2.
3.
4" MIN.
4" MIN.
1
1
2" x 1
1
2" WOODEN FENCE POSTS
SF
002 SWALE WATTEL DIKE
006 SOIL RIPRAP INSTALLATION
NOTES
1. CONCRETE WASHOUT AREA SHALL BE
INSTALLED PRIOR TO ANY CONCRETE
PLACEMENT ON SITE.
2. VEHICLE TRACKING CONTROL IS REQUIRED IF
ACCESS TO CONCRETE WASHOUT AREA IS OFF
PAVEMENT.
3. SIGNS SHALL BE PLACED AT THE
CONSTRUCTION ENTRANCE, AT THE WASHOUT
AREA, AND ELSEWHERE AS NECESSARY TO
CLEARLY INDICATE THE LOCATION OF THE
CONCRETE WASHOUT AREA TO OPERATORS
OF CONCRETE TRUCKS AND PUMP RIGS.
4. THE CONCRETE WASHOUT AREA SHALL BE
REPAIRED AND ENLARGED OR CLEANED OUT
AS NECESSARY TO MAINTAIN CAPACITY FOR
WASTED CONCRETE.
5. THE CONCRETE WASHOUT SHOULD BE
EMPTIED WHEN HALF OF TOTAL HOLDING
CAPACITY HAS BEEN REACHED.
6. AT THE END OF CONSTRUCTION, ALL
CONCRETE SHALL BE REMOVED FROM THE
SITE AND DISPOSED OF AT AN ACCEPTED
WASTE SITE.
7. WHEN THE CONCRETE WASHOUT AREA IS
REMOVED, THE DISTURBED AREA SHALL BE
SEEDED AND MULCHED OR OTHERWISE
STABILIZED IN A MANNER ACCEPTED BY THE
CITY.
8. LOCATION OF CONCRETE WASHOUT AREA IS
CONCEPTUAL ONLY. FINAL LOCATION TO BE
DETERMINED IN THE FIELD AT CONTRACTOR'S
DISCRETION.
3H:1V OR FLATTER
SIDE SLOPES
12" MIN
8'x 8' MIN
OR AS REQUIRED TO
CONTAIN WASTE CONCRETE
12" 2'-0" MIN.
COMPACTED EMBANKMENT
MATERIAL, TYP.
BERM AROUND PERIMETER
GROUND SURFACE
SIGN TO INDICATE THE
LOCATION OF THE
CONCRETE WASHOUT AREA
*IMPERMEABLE LINER MAY BE NEEDED
IF GROUND WATER IS ENCOUNTERED.
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BLOCK 3
BLOCK 3
BLOCK 3
BLOCK 1
TRACT E
FUTURE DEVELOPMENT
TRACT L
D&UE
TRACT D
FUTURE DEVELOPMENT
TRACT B
FUTURE PUBLIC PARK
TRACT F
DRAINAGE, UTILITY &
PEDESTRIAN ACCESS
EASEMENT TRACT K
D&UE
Sheet
of 69
HANSEN SUBDIVISION These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
301 North Howes Street, Suite 100
Fort Collins, Colorado 80521
E NGINEER ING
N O R T H E RN
PHONE: 970.221.4158
www.northernengineering.com
( IN FEET )
0
1 INCH = 150 FEET
150 150 300 450
DYN
EROSION CONTROL PLAN
DYNAMIC PLAN
68
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
Call before you dig.
R
NORTH
1. IT SHOULD BE NOTED THAT ANY EROSION CONTROL PLAN SERVES ONLY
AS A GUIDELINE TO THE CONTRACTOR. STAGING AND/OR PHASING OF
BEST MANAGEMENT PRACTICES (BMPs) IS EXPECTED. ADDITIONAL AND/OR
DIFFERENT BMPs FROM THOSE ORIGINALLY DEPICTED MAY BE NECESSARY
DURING CONSTRUCTION DUE TO CHANGING SITE CONDITIONS OR AS
REQUIRED BY LOCAL AUTHORITIES.
2. THIS EROSION CONTROL PLAN IS SCHEMATIC IN NATURE. AS SUCH,
GRAPHICAL SYMBOLS MAY NOT BE TO SCALE, NOR ARE THEY
NECESSARILY SHOWN IN THEIR EXACT LOCATION.
3. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL PERMITTING (CITY,
STATE DISCHARGE PERMIT, ETC.) AND COMPLIANCE WITH GOVERNING
AUTHORITIES. IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR (OR
PERMIT HOLDER) TO ENSURE EROSION CONTROL MEASURES ARE
PROPERLY MAINTAINED AND FOLLOWED.
4. CONTRACTOR SHALL IMPLEMENT THE APPROPRIATE EROSION CONTROL
MEASURES ACCORDING THE THE CONSTRUCTION SEQUENCING AND LEVEL
OF SITE STABILIZATION.
5. CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION FOR
ALL STORM DRAINS, SWALES, PONDS AND RAIN GARDENS UNTIL SITE IS
FULLY STABILIZED.
6. CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION FOR
DOWNSPOUT CONNECTIONS, TO THE STORM DRAIN SYSTEM, UNTIL
CONNECTION IS ESTABLISHED WITH DOWNSPOUT.
7. INLET PROTECTION SHALL BE ADAPTED, AS NECESSARY, TO THE
SURROUNDING SURFACE TYPE AND CONDITION (i.e., STAKE-DRIVEN
WATTLES FOR BARE SOIL OR GRAVEL SOCKS FOR PAVEMENT, ETC.)
8. CONTRACTOR IS RESPONSIBLE FOR STABILIZING ALL SLOPES,
PARTICULARLY THOSE STEEPER THAN 6:1. CRIMP MULCHING, HYDRO
MULCHING, EROSION MATS, TEMPORARY IRRIGATION, AND ADDITIONAL
WATTLES OR SILT FENCING MAY BE NECESSARY TO ESTABLISH
VEGETATIVE COVER AND STABILIZE THE SLOPE.
9. CONTRACTOR IS RESPONSIBLE FOR PREVENTING SEDIMENT FROM
UNSTABILIZED LANDSCAPE AREAS FROM MIGRATING ONTO AND ENTERING
THE PERMEABLE PAVER SYSTEMS UNTIL UPGRADIENT TRIBUTARY AREAS
ARE FULLY STABILIZED.
10. ADDITIONAL WATTLES, SILT FENCE, OR OTHER MEASURES, MAY BE
NECESSARY TO ENSURE THAT EACH BUILDING PAD IS STABILIZED
THROUGHOUT CONSTRUCTION. AT NO TIME SHALL SEDIMENT BE
ALLOWED TO CROSS THE PUBLIC SIDEWALKS.
11. CONTRACTOR SHALL IMPLEMENT APPROPRIATE PERIMETER PROTECTION
FOR AREAS DIRECTING DRAINAGE OFFSITE. PERIMETER PROTECTION
SHALL BE ADAPTED, AS NECESSARY, TO THE SURROUNDING SURFACE
TYPE AND CONDITION (i.e., STAKE-DRIVEN SEDIMENT CONTROL LOGS OR
SILT FENCE FOR BARE SOIL, SAND BAGS OR GRAVEL SOCKS FOR
PAVEMENT, ETC.)
12. FUELING FACILITIES SHALL BE LOCATED AT LEAST ONE HUNDRED (100)
FEET FROM NATURAL BODY OF WATER, WETLAND, NATURAL DRAINAGE
WAY OR MANMADE DRAINAGE WAY. THE FUEL TANKS AND FUELING AREA
MUST BE SET IN A CONTAINMENT AREA THAT WILL NOT ALLOW A FUEL
SPILL TO DIRECTLY FLOW, SEEP, RUN OFF, OR BE WASHED INTO A BODY OF
WATER, WETLAND OR DRAINAGE WAY.
13. CONSTRUCTION WASTE STORAGE (DUMPSTERS) AND PORTABLE
SANITATION UNITS (CONSTRUCTION TOILETS) SHALL BE LOCATED AT
LEAST FIFTY (50) FEET FROM ANY STORMWATER INLET, WETLAND, OR
DRAINAGE WAY. SAID FACILITIES MUST BE SET IN A CONTAINMENT AREA
THAT WILL NOT ALLOW POLLUTANTS TO DIRECTLY FLOW, SEEP, RUN OFF,
OR BE WASHED INTO A BODY OF WATER, WETLAND OR DRAINAGE WAY.
DUMPSTERS SHALL BE LOCATED ON FLAT, STABLE GROUND, AND
CONSTRUCTION TOILETS SHALL BE STAKED DOWN.
14. THE CONTRACTOR AND ALL SUBCONTRACTORS WILL COOPERATE WITH
THE CITY'S CONSTRUCTION INSPECTORS BY CEASING OPERATIONS WHEN
WINDS ARE OF SUFFICIENT VELOCITY TO CREATE BLOWING DUST WHICH,
IN THE INSPECTOR'S OPINION, IS HAZARDOUS TO THE PUBLIC HEALTH AND
WELFARE.
15. WHERE SEASONAL CONSTRAINTS (E.G., DURING SUMMER AND WINTER
MONTHS) INHIBIT PERMANENT SEEDING OPERATIONS, DISTURBED AREAS
WILL BE TREATED WITH MULCH AND MULCH TACKIFIER OR OTHER
MATERIALS APPROVED BY EROSION CONTROL STAFF TO PREVENT
EROSION.
16. SEE LANDSCAPE PLANS FOR ADDITIONAL INFORMATION ON PLANTING,
REVEGETATION, HARDSCAPE AND OTHER PERMANENT SITE STABILIZATION
METHODS.
EROSION CONTROL NOTES:
NOTE:
ALL BMPS SHOWN ON THIS PLAN ARE GRAPHIC
REPRESENTATIONS ONLY. FINAL DETERMINATION OF SIZE
AND LOCATION SHALL BE DETERMINED BY THE CONTRACTOR
AND DOCUMENTED ON THE DYNAMIC SITE PLAN.
LEGEND:
PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
PROPOSED INLET
PROPOSED UNDERDRAIN UD
BENCHMARK/BASIS OF BEARING
BENCHMARK #1:
City of Fort Collins Benchmark 2-02:
Elevation= 4964.37
BENCHMARK #2:
City of Fort Collins Benchmark 16-01:
Elevation= 4956.98
Basis of Bearing
The Basis of Bearings is the East line of the Northeast Quarter of Section 7, as
bearing South 00°00'53" East (assumed bearing) as monumented on drawing.
WATTLE DIKE
INLET PROTECTION IP
VEHICLE TRACKING CONTROL PAD
VTC
SILT FENCE SF SF
ROCK SOCK RS
RIP RAP RR
1. CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED SLOPES BY
CRIMP MULCHING OR SIMILAR METHODS. CONTRACTOR TO USE CDOT STRAW
MULCH SPECS UNLESS OTHERWISE DIRECTED.
2. SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone________________________________
3. CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR CONCRETE
WASHOUT AREA IF ACCESS IS OFF PAVEMENT.
4. DRYWELLS AND BIORETENTION MEDIA TO BE INSTALLED AFTER STABILIZATION
OF OVERLOT GRADING.
5. ALL DISTURBED SOILS SHALL BE RESEEDED WITH A COVER CROP UPON
COMPLETION OF THE INFRASTRUCTURE IMPROVEMENTS. THE RECOMMENDED
SPECIES AND APPLICATION RATES OF PURE LIVE SEED FOR COVER CROPS
ARE AS FOLLOWS:
GREAT BASIN WILRYE 3LBS/ACRE
GREEN NEEDLEGRASS2LBS/ACRE
INDIAN RICEGRASS 1LBS/ACRE
SLENDER WHEATGRASS 2LBS/ACRE
THICKSPIKE WHEATGRASS 3LBS/ACRE
WESTERN WHEATGRASS 4LBS/ACRE
TRITICALE 10LBS/ACRE
WINTER WHEAT 5LBS/ACRE
6. REFER TO THE PRELIMINARY DRAINAGE AND EROSION CONTROL REPORT FOR
HANSEN PROPERTY DATED: SEPTEMBER 7, 2018 FOR ADDITIONAL
INFORMATION.
GENERAL NOTES:
WD
TRAFFIC CONTROL BARRICADE TCB
CONCRETE WASH AREA CWA
SEDIMENT TRAP ST
CONSTRUCTION FENCE CF CF CF
LIMITS OF DISTURBANCE LOD
MULCH MU
TABLE OF CONSTRUCTION SEQUENCE AND BMP APPLICATION/REMOVAL
Project: HANSON SUBDIVISION Date: 04/12/19
Contractor to utilize this table to indicate when construction activities occur and when each associated BMP is installed or removed.
CONSTRUCTION PHASE (Monthly) 1 2 3 4 5 6 7 8 9 10 11 12 Comments
Grading
Overlot
Swales, Drainageways
Pipeline Installation
Stormwater
Concrete Installation
Building Structure
Miscellaneous
Hardscape Amenities
BEST MANAGEMENT PRACTICES
Temporary
Contour Furrows and Diversion Dikes (Ripping/Disking)
Inlet Protection (IP)
Vehicle Tracking Control (VTC)
Flow Barriers (Bales, Wattles, Etc) (WD)
Concrete Washout Area (CWA)
Preventative Maintenance Activities/Meetings/ etc.
Permanent
Mulching/Sealant
Permanent Seed Planting
Water Service
Sanitary Sewer Service
Curb and Gutter
Concrete Parking and Drive Aisle
Bio-Swale
Permeable Pavers
S
S
W
W
W
W
W
W
W
W
W
W
W
W
W W
W
W W
W
W
W W
W
W
S
S
S
S
S S
S
S
S S
S
S S
S
S
S
S
S
S
S
S
S
S
S
S S S
W
W
W W
S
S
S S
S
W
W
W W
W
S
S
S
S
S
S
W
W
W W W
W
S
S
S
S
W W
W
W
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
W
W
W
W
W
W
W
W
W
W
W
W
W W
W
W
W
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S S
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
S
S S
S
S
W
W
W
W
W
W
S
S S
S S
S S S
S
S
S
WW
W
W W W
W
W
W
W
W
S
S
S
S
S
S
S
W
W
W
W
W
W
W
WM
WM
WM
WM
WM
WM
WM
W
W
W W
W
W
W
W
W
S
S
S
S
S
S S S S S
W
M
W
WM WM
W
WM
S
S
S
WM
W
S
S
W
W W
S
S S S
S
S
S
S
S S S
WW
WW
WM
WM
WM
WM
WM WM
WM
WM
WM
WM
W WW W
W
WW
W
W
W
S S S S S
S S
S S
S
S
S
S
S
S
S
S
S
S
S S
S
S S
W
WM M
WM
WM
WM
WM
WM
WM
WM
WM
WM
W
W
W
WW
W
W
WW W
W
W
W
WW WW W
WW WW W
W
W
S
S
S
S
S
S
S
S
S
S
S
S
W
WM WM M
WM
WM
WM
WM
WM
WM
WM
WM
W
WM
WM
W
WM
WM
W
W
WM
WM
WM
WM
W
W W
WM
W
BLOCK 3
BLOCK 1
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
WD
WD
WD
WD
WD
WD
WD
WD
WD
IP
IP
IP
IP
IP
IP
IP
IP
IP
CWA
VTC
ST
VTC
CWA
ST
ST
WD
RS
BLOCK 2
BLOCK 5
BLOCK 6 BLOCK 13
BLOCK 14
BLOCK 4
BLOCK 12
BLOCK 7
BLOCK 8
BLOCK 11
BLOCK 10
BLOCK 9
BLOCK 2
BLOCK 2
BLOCK 2
BLOCK 3
BLOCK 3
BLOCK 3
BLOCK 1
TRACT E
FUTURE DEVELOPMENT
TRACT L
D&UE
TRACT D
FUTURE DEVELOPMENT
TRACT B
FUTURE PUBLIC PARK
TRACT F
DRAINAGE, UTILITY &
PEDESTRIAN ACCESS
EASEMENT TRACT K
D&UE
MU
MU
MU
MU
MU
MU
MU
CF CF
CF
CF
CF
CF CF
CF
CF
CF CF CF
CF
CONSTRUCTION
FENCE
MU
ECB
Sheet
of 69
HANSEN SUBDIVISION These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
301 North Howes Street, Suite 100
Fort Collins, Colorado 80521
E NGINEER ING
N O R T H E RN
PHONE: 970.221.4158
www.northernengineering.com
( IN FEET )
0
1 INCH = 150 FEET
150 150 300 450
STAT
EROSION CONTROL PLAN
STATIC PLAN
68
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
Call before you dig.
R
NORTH
1. IT SHOULD BE NOTED THAT ANY EROSION CONTROL PLAN SERVES ONLY
AS A GUIDELINE TO THE CONTRACTOR. STAGING AND/OR PHASING OF
BEST MANAGEMENT PRACTICES (BMPs) IS EXPECTED. ADDITIONAL AND/OR
DIFFERENT BMPs FROM THOSE ORIGINALLY DEPICTED MAY BE NECESSARY
DURING CONSTRUCTION DUE TO CHANGING SITE CONDITIONS OR AS
REQUIRED BY LOCAL AUTHORITIES.
2. THIS EROSION CONTROL PLAN IS SCHEMATIC IN NATURE. AS SUCH,
GRAPHICAL SYMBOLS MAY NOT BE TO SCALE, NOR ARE THEY
NECESSARILY SHOWN IN THEIR EXACT LOCATION.
3. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL PERMITTING (CITY,
STATE DISCHARGE PERMIT, ETC.) AND COMPLIANCE WITH GOVERNING
AUTHORITIES. IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR (OR
PERMIT HOLDER) TO ENSURE EROSION CONTROL MEASURES ARE
PROPERLY MAINTAINED AND FOLLOWED.
4. CONTRACTOR SHALL IMPLEMENT THE APPROPRIATE EROSION CONTROL
MEASURES ACCORDING THE THE CONSTRUCTION SEQUENCING AND LEVEL
OF SITE STABILIZATION.
5. CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION FOR
ALL STORM DRAINS, SWALES, PONDS AND RAIN GARDENS UNTIL SITE IS
FULLY STABILIZED.
6. CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION FOR
DOWNSPOUT CONNECTIONS, TO THE STORM DRAIN SYSTEM, UNTIL
CONNECTION IS ESTABLISHED WITH DOWNSPOUT.
7. INLET PROTECTION SHALL BE ADAPTED, AS NECESSARY, TO THE
SURROUNDING SURFACE TYPE AND CONDITION (i.e., STAKE-DRIVEN
WATTLES FOR BARE SOIL OR GRAVEL SOCKS FOR PAVEMENT, ETC.)
8. CONTRACTOR IS RESPONSIBLE FOR STABILIZING ALL SLOPES,
PARTICULARLY THOSE STEEPER THAN 6:1. CRIMP MULCHING, HYDRO
MULCHING, EROSION MATS, TEMPORARY IRRIGATION, AND ADDITIONAL
WATTLES OR SILT FENCING MAY BE NECESSARY TO ESTABLISH
VEGETATIVE COVER AND STABILIZE THE SLOPE.
9. CONTRACTOR IS RESPONSIBLE FOR PREVENTING SEDIMENT FROM
UNSTABILIZED LANDSCAPE AREAS FROM MIGRATING ONTO AND ENTERING
THE PERMEABLE PAVER SYSTEMS UNTIL UPGRADIENT TRIBUTARY AREAS
ARE FULLY STABILIZED.
10. ADDITIONAL WATTLES, SILT FENCE, OR OTHER MEASURES, MAY BE
NECESSARY TO ENSURE THAT EACH BUILDING PAD IS STABILIZED
THROUGHOUT CONSTRUCTION. AT NO TIME SHALL SEDIMENT BE
ALLOWED TO CROSS THE PUBLIC SIDEWALKS.
11. CONTRACTOR SHALL IMPLEMENT APPROPRIATE PERIMETER PROTECTION
FOR AREAS DIRECTING DRAINAGE OFFSITE. PERIMETER PROTECTION
SHALL BE ADAPTED, AS NECESSARY, TO THE SURROUNDING SURFACE
TYPE AND CONDITION (i.e., STAKE-DRIVEN SEDIMENT CONTROL LOGS OR
SILT FENCE FOR BARE SOIL, SAND BAGS OR GRAVEL SOCKS FOR
PAVEMENT, ETC.)
12. FUELING FACILITIES SHALL BE LOCATED AT LEAST ONE HUNDRED (100)
FEET FROM NATURAL BODY OF WATER, WETLAND, NATURAL DRAINAGE
WAY OR MANMADE DRAINAGE WAY. THE FUEL TANKS AND FUELING AREA
MUST BE SET IN A CONTAINMENT AREA THAT WILL NOT ALLOW A FUEL
SPILL TO DIRECTLY FLOW, SEEP, RUN OFF, OR BE WASHED INTO A BODY OF
WATER, WETLAND OR DRAINAGE WAY.
13. CONSTRUCTION WASTE STORAGE (DUMPSTERS) AND PORTABLE
SANITATION UNITS (CONSTRUCTION TOILETS) SHALL BE LOCATED AT
LEAST FIFTY (50) FEET FROM ANY STORMWATER INLET, WETLAND, OR
DRAINAGE WAY. SAID FACILITIES MUST BE SET IN A CONTAINMENT AREA
THAT WILL NOT ALLOW POLLUTANTS TO DIRECTLY FLOW, SEEP, RUN OFF,
OR BE WASHED INTO A BODY OF WATER, WETLAND OR DRAINAGE WAY.
DUMPSTERS SHALL BE LOCATED ON FLAT, STABLE GROUND, AND
CONSTRUCTION TOILETS SHALL BE STAKED DOWN.
14. THE CONTRACTOR AND ALL SUBCONTRACTORS WILL COOPERATE WITH
THE CITY'S CONSTRUCTION INSPECTORS BY CEASING OPERATIONS WHEN
WINDS ARE OF SUFFICIENT VELOCITY TO CREATE BLOWING DUST WHICH,
IN THE INSPECTOR'S OPINION, IS HAZARDOUS TO THE PUBLIC HEALTH AND
WELFARE.
15. WHERE SEASONAL CONSTRAINTS (E.G., DURING SUMMER AND WINTER
MONTHS) INHIBIT PERMANENT SEEDING OPERATIONS, DISTURBED AREAS
WILL BE TREATED WITH MULCH AND MULCH TACKIFIER OR OTHER
MATERIALS APPROVED BY EROSION CONTROL STAFF TO PREVENT
EROSION.
16. SEE LANDSCAPE PLANS FOR ADDITIONAL INFORMATION ON PLANTING,
REVEGETATION, HARDSCAPE AND OTHER PERMANENT SITE STABILIZATION
METHODS.
EROSION CONTROL NOTES:
NOTE:
ALL BMPS SHOWN ON THIS PLAN ARE GRAPHIC
REPRESENTATIONS ONLY. FINAL DETERMINATION OF SIZE
AND LOCATION SHALL BE DETERMINED BY THE CONTRACTOR
AND DOCUMENTED ON THE DYNAMIC SITE PLAN.
TABLE OF CONSTRUCTION SEQUENCE
AND BMP APPLICATION
Project: PATEROS CREEK
CONSTRUCTION PHASE MOBILIZATION DEMOLITION GRADING
BEST MANAGEMENT PRACTICES (BMPS)
STRUCTURAL "INSTALLATION"
Construction & Silt Fence Barriers *
Flow Barriers (Wattles) *
Inlet Filter Bags *
Rip Rap
Vegetative
Temporary Seeding Planting
Mulching / Sealant
Permanent Seeding Planting
Sod Installation
Rolled Products : Netting / Blankets / Mats
Contour Furrows (Ripping / Disking)
Sediment Basin
Rock Bags *
UTILITIES
INSTALLATION
FLAT WORK
INSTALLATION
VERTICAL
INSTALLATION LANDSCAPE DEMOBILIZATION
Vehicle Tracking Pad *
* All Temporary BMPs to be Removed once Construction is Complete
Other:
Any prior inlets that could use protecting
Any prior inlets that could use protecting
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
LEGEND:
PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
PROPOSED INLET
PROPOSED UNDERDRAIN UD
BENCHMARK/BASIS OF BEARING
BENCHMARK #1:
City of Fort Collins Benchmark 2-02:
Elevation= 4964.37
BENCHMARK #2:
City of Fort Collins Benchmark 16-01:
Elevation= 4956.98
Basis of Bearing
The Basis of Bearings is the East line of the Northeast Quarter of Section 7, as
bearing South 00°00'53" East (assumed bearing) as monumented on drawing.
WATTLE DIKE
INLET PROTECTION IP
VEHICLE TRACKING CONTROL PAD
VTC
SILT FENCE SF SF
ROCK SOCK RS
RIP RAP RR
1. CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED SLOPES BY
CRIMP MULCHING OR SIMILAR METHODS. CONTRACTOR TO USE CDOT STRAW
MULCH SPECS UNLESS OTHERWISE DIRECTED.
2. SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone________________________________
3. CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR CONCRETE
WASHOUT AREA IF ACCESS IS OFF PAVEMENT.
4. DRYWELLS AND BIORETENTION MEDIA TO BE INSTALLED AFTER STABILIZATION
OF OVERLOT GRADING.
5. ALL DISTURBED SOILS SHALL BE RESEEDED WITH A COVER CROP UPON
COMPLETION OF THE INFRASTRUCTURE IMPROVEMENTS. THE RECOMMENDED
SPECIES AND APPLICATION RATES OF PURE LIVE SEED FOR COVER CROPS
ARE AS FOLLOWS:
GREAT BASIN WILRYE 3LBS/ACRE
GREEN NEEDLEGRASS2LBS/ACRE
INDIAN RICEGRASS 1LBS/ACRE
SLENDER WHEATGRASS 2LBS/ACRE
THICKSPIKE WHEATGRASS 3LBS/ACRE
WESTERN WHEATGRASS 4LBS/ACRE
TRITICALE 10LBS/ACRE
WINTER WHEAT 5LBS/ACRE
6. REFER TO THE FINAL DRAINAGE AND EROSION CONTROL REPORT FOR
HANSEN PROPERTY DATED: APRIL 17, 2019 FOR ADDITIONAL INFORMATION.
GENERAL NOTES:
WD
TRAFFIC CONTROL BARRICADE TCB
CONCRETE WASH AREA CWA
SEDIMENT TRAP ST
CONSTRUCTION FENCE CF CF CF
LIMITS OF DISTURBANCE LOD
MULCH MU
Under slope stabilization rolled products. Reseeding may be required.
MOUNTING CURB; HOWEVER, CURB MAY BE
CUT DOWN TO A HEIGHT OF 2" OR HIGHER
FOR EASIER ACCESS AND REPLACED AT
PROJECT COMPLETION. OTHER ACCESS
DEVICES MAY BE USED AS ACCEPTED BY
THE CITY.
CURB CUT
50' MIN.
2" MIN. 6" MIN.
6" MIN.
ALTHOUGH NOT NORMALLY USED, THE CITY RESERVES THE RIGHT TO REQUIRE VEHICLE TRACKING CONTROL WITH A TEMPORARY CATTLE GUARD
AND/OR WHEEL WASH FACILITIES AT SITES WHERE TRACKING ONTO PAVED AREAS BECOMES A SIGNIFICANT PROBLEM AS DETERMINED BY THE CITY
INSPECTOR.
IF VEHICLE TRACKING CONTROL WITH WHEEL WASH FACILITIES ARE REQUIRED, ALL WHEELS ON EVERY VEHICLE LEAVING THE SITE SHALL BE
CLEANED OF MUD USING A PRESSURE-WASHER. THE CONTRACTOR SHALL BE RESPONSIBLE FOR OBTAINING A WATER SOURCE AND CONSTRUCTING
A WASHWATER SEDIMENT TRAP.
5.
6.
IF VEHICLE WHEEL WASH FACILITIES ARE REQUIRED, CONTRACTOR SHALL INSPECT VEHICLE TRACKING CONTROL AND WHEEL WASH FACILITIES DAILY.
ACCUMULATED SEDIMENTS SHALL BE REMOVED FROM THE PAD SURFACE.
ACCUMULATED SEDIMENT IN THE WASHWATER/SEDIMENT TRAP SHALL BE REMOVED WHEN THE SEDIMENT REACHES AN AVERAGE DEPTH OF 12-INCHES.
4.
5.
VTC
IP
IP
001 CONCRETE WASHOUT AREA
003 ROCK SOCK DETAIL 004 VEHICLE TRACKING CONTROL PAD
008 CURB INLET PROTECTION
007 AREA INLET FILTER GRAVEL
ROCK SOCK SECTION ROCK SOCK PLAN
ROCK SOCK JOINTING
ROCK SOCK INSTALLATION NOTES
1. SEE PLAN VIEW FOR:
- LOCATION (S) OF ROCK SOCKS.
2. CRUSHED ROCK SHALL BE 11
2" (MINUS) IN SIZE WITH A FRACTURED FACE (ALL SIDES) AND SHALL COMPLY WITH
GRADATION SHOWN ON THIS SHEET (11
2" MINUS).
3. WIRE MESH SHALL BE FABRICATED OF 10 GAGE POULTRY MESH, OR EQUIVALENT, WITH A MAXIMUM OPENING OF
1
2", RECOMMENDED MINIMUM ROLL WIDTH OF 48".
4. WIRE MESH SHALL BE SECURED USING "HOG RINGS" OR WIRE TIES AT 6" CENTERS ALONG ALL JOINTS AND AT 2"
CENTERS ON ENDS OF SOCKS.
5. SOME MUNICIPALITIES MAY ALLOW THE USE OF FILTER FABRIC AS AN ALTERNATIVE TO WIRE MESH FOR THE
ROCK ENCLOSURE.
GRADATION TABLE
SIEVE SIZE
MASS PERCENT
PASSING SQUARE
MESH SIEVES
NO. 4
2" 100
1-1/2" 90-100
1" 20-55
3/4" 0-15
3/8" 0-5
MATCHES SPECIFICATIONS FOR NO. 4 COARSE AGGREGATE FOR
CONCRETE PER AASHTO M43. ALL ROCK SHALL BE FRACTURED FACE,
ALL SIDES
WIRE ENCLOSED 1 1/2"
WASHED ROCK
2'
RS
005 SILT FENCE/PERIMETER PROTECTION
POSTS
PREASSEMBLED SILT FENCE POSTS SHALL OVERLAP
AT JOINTS SO THAT NO
GAPS EXIST IN SILT FENCE.
NOTE:
THICKNESS OF GEOTEXTILE
POST SHALL BE JOINED AS SHOWN, THEN HAS BEEN EXAGGERATED.
ROTATED 180° IN DIRECTION SHOWN AND
DRIVEN INTO THE GROUND.
SILT FENCE JOINTS
DRIVE POSTS VERTICALLY INTO THE GROUND TO A MINIMUM DEPTH OF 18".
EXCAVATE A TRENCH APPROXIMATELY 4" WIDE AND 4" DEEP ALONG THE
LINE OF POSTS AND UPSLOPE FROM THE BARRIER.
ANCHOR TRENCH SHALL BE EXCAVATED BY HAND, WITH TRENCHER, OR
WITH SILT FENCE INSTALLATION MACHINE. NO ROAD GRADERS, BACKHOES,
ETC. SHALL BE USED.
NOT LESS THAN THE BOTTOM 1' OF THE SILT FENCE FABRIC SHALL BE
BURIED IN THE TRENCH.
THE TRENCH SHALL BE COMPACTED BY HAND, WITH "JUMPING JACK" OR BY
WHEEL ROLLING. COMPACTION SHALL BE SUCH THAT THE SILT FENCE
RESISTS BEING PULLED OUT OF ANCHOR TRENCH BY HAND.
SILT FENCE INDICATED IN THE PLANS SHALL BE INSTALLED PRIOR TO ANY
LAND-DISTURBING ACTIVITIES.
USE WOOD POSTS OR OTHER MATERIAL AS ACCEPTED BY THE CITY.
INSTALLATION NOTES:
1.
2.
3.
4.
5.
6.
7.
THE CONTRACTOR SHALL INSPECT SILT FENCE EVERY TWO WEEKS AND
AFTER SIGNIFICANT STORM EVENTS AND MAKE REPAIRS OR CLEAN OUT
UPSTREAM SEDIMENT AS NECESSARY.
SEDIMENT ACCUMULATED UPSTREAM OF SILT FENCE SHALL BE REMOVED
WHEN THE UPSTREAM SEDIMENT REACHES A DEPTH OF 6".
SILT FENCE SHALL BE REMOVED WHEN THE UPSTREAM DISTURBED AREA IS
STABILIZED AND GRASS COVER IS ACCEPTED BY THE CITY. IF ANY
DISTURBED AREA EXISTS AFTER REMOVAL, IT SHALL BE SEEDED AND
MULCHED OR OTHERWISE STABILIZED IN A MANNER ACCEPTED BY THE CITY.
MAINTENANCE NOTES:
1.
2.
3.
4" MIN.
4" MIN.
1
1
2" x 1
1
2" WOODEN FENCE POSTS
SF
002 SWALE WATTEL DIKE
006 SOIL RIPRAP INSTALLATION
NOTES
1. CONCRETE WASHOUT AREA SHALL BE
INSTALLED PRIOR TO ANY CONCRETE
PLACEMENT ON SITE.
2. VEHICLE TRACKING CONTROL IS REQUIRED IF
ACCESS TO CONCRETE WASHOUT AREA IS OFF
PAVEMENT.
3. SIGNS SHALL BE PLACED AT THE
CONSTRUCTION ENTRANCE, AT THE WASHOUT
AREA, AND ELSEWHERE AS NECESSARY TO
CLEARLY INDICATE THE LOCATION OF THE
CONCRETE WASHOUT AREA TO OPERATORS
OF CONCRETE TRUCKS AND PUMP RIGS.
4. THE CONCRETE WASHOUT AREA SHALL BE
REPAIRED AND ENLARGED OR CLEANED OUT
AS NECESSARY TO MAINTAIN CAPACITY FOR
WASTED CONCRETE.
5. THE CONCRETE WASHOUT SHOULD BE
EMPTIED WHEN HALF OF TOTAL HOLDING
CAPACITY HAS BEEN REACHED.
6. AT THE END OF CONSTRUCTION, ALL
CONCRETE SHALL BE REMOVED FROM THE
SITE AND DISPOSED OF AT AN ACCEPTED
WASTE SITE.
7. WHEN THE CONCRETE WASHOUT AREA IS
REMOVED, THE DISTURBED AREA SHALL BE
SEEDED AND MULCHED OR OTHERWISE
STABILIZED IN A MANNER ACCEPTED BY THE
CITY.
8. LOCATION OF CONCRETE WASHOUT AREA IS
CONCEPTUAL ONLY. FINAL LOCATION TO BE
DETERMINED IN THE FIELD AT CONTRACTOR'S
DISCRETION.
3H:1V OR FLATTER
SIDE SLOPES
12" MIN
8'x 8' MIN
OR AS REQUIRED TO
CONTAIN WASTE CONCRETE
12" 2'-0" MIN.
COMPACTED EMBANKMENT
MATERIAL, TYP.
BERM AROUND PERIMETER
GROUND SURFACE
SIGN TO INDICATE THE
LOCATION OF THE
CONCRETE WASHOUT AREA
*IMPERMEABLE LINER MAY BE NEEDED
IF GROUND WATER IS ENCOUNTERED.
RP
S
S
S
W
W W
W
W
W
W
W
W
W
W W
W
W
W
W W
W W
W W
W
W
S
S
S
S
S
S
S S
S S
S
S S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
W W
W
W
S
S
S S
S
W
W
W W
W
S
S
S S
S
S
W
W
W W W
W
S
S
S
S
W
W
W
W
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
W
W
W
W
W
W
W
W
W
W
W W
W W
W
W
W
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
W
W
W
W
W
W
W
W
W
W W
W
W
W
W
W
W
S
S S S S
W
W
W W W
W
S
S S
S
S
S
S
S
S
S
S
WW
W
W
W
W W
W
W
W
W
S
S
S
S
S
S
S
W
W
W
W
W
W
W
W
M
WM
WM
WM
WM
WM
WM
W
W
W W
W
WW
WW
S
S
S
S
S
S
S
S S S
W
M
W
WM WM
W
WM
S
S
S
WM
W
S S
W
W
W
S S S S
S
S
S
S S S
S
W
WW W
W
M
WM
WM
WM
WM
WM WM
WM
WM
WM
W W
W
WW
W
W
WW
W
S S
S
S S
S S
S S S
S
S S S S
S
S
S
S
S S S
S S
W
WM M
WM
WM
WM
WM
WM
WM
WM
WM
WM
WM
W
W
W
WW WW
WW
W
W
W
W
WW
WW
W
W
W
WW
WW
W
S
S
S
S
S
S
S
S
S
S
S
S
W
WM WM M
WM
WM
WM
WM
WM
WM
WM
WM
W
WM
WM
W
WM
WM
W
W
WM WM
WM
WM
W
W
W
WM
W
BLOCK 3
BLOCK 1
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
RS
WD
WD
WD
WD
WD
WD
WD
WD
WD
IP
IP
IP
IP
IP
IP
IP
IP
IP
CWA
VTC
ST
VTC
CWA
ST
ST
WD
RS
BLOCK 2
BLOCK 5
BLOCK 6 BLOCK 13
BLOCK 14
BLOCK 4
BLOCK 12
BLOCK 7
BLOCK 8
BLOCK 11
BLOCK 10
BLOCK 9
BLOCK 2
BLOCK 2
BLOCK 2
BLOCK 3
BLOCK 3
BLOCK 3
BLOCK 1
TRACT E
FUTURE DEVELOPMENT
TRACT L
D&UE
TRACT D
FUTURE DEVELOPMENT
TRACT B
FUTURE PUBLIC PARK
TRACT F
DRAINAGE, UTILITY &
PEDESTRIAN ACCESS
EASEMENT TRACT K
D&UE
MU
MU
MU
MU
MU
MU
MU
CF CF
CF
CF
CF
CF CF
CF CF CF
CF CF CF
CONSTRUCTION
FENCE
MU
ECB
Sheet
of 69
HANSEN SUBDIVISION These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
301 North Howes Street, Suite 100
Fort Collins, Colorado 80521
E NGINEER ING
N O R T H E RN
PHONE: 970.221.4158
www.northernengineering.com
( IN FEET )
0
1 INCH = 150 FEET
150 150 300 450
EC1
EROSION CONTROL PLAN
68
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
Call before you dig.
R
NORTH
1. IT SHOULD BE NOTED THAT ANY EROSION CONTROL PLAN SERVES ONLY
AS A GUIDELINE TO THE CONTRACTOR. STAGING AND/OR PHASING OF
BEST MANAGEMENT PRACTICES (BMPs) IS EXPECTED. ADDITIONAL AND/OR
DIFFERENT BMPs FROM THOSE ORIGINALLY DEPICTED MAY BE NECESSARY
DURING CONSTRUCTION DUE TO CHANGING SITE CONDITIONS OR AS
REQUIRED BY LOCAL AUTHORITIES.
2. THIS EROSION CONTROL PLAN IS SCHEMATIC IN NATURE. AS SUCH,
GRAPHICAL SYMBOLS MAY NOT BE TO SCALE, NOR ARE THEY
NECESSARILY SHOWN IN THEIR EXACT LOCATION.
3. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL PERMITTING (CITY,
STATE DISCHARGE PERMIT, ETC.) AND COMPLIANCE WITH GOVERNING
AUTHORITIES. IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR (OR
PERMIT HOLDER) TO ENSURE EROSION CONTROL MEASURES ARE
PROPERLY MAINTAINED AND FOLLOWED.
4. CONTRACTOR SHALL IMPLEMENT THE APPROPRIATE EROSION CONTROL
MEASURES ACCORDING THE THE CONSTRUCTION SEQUENCING AND LEVEL
OF SITE STABILIZATION.
5. CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION FOR
ALL STORM DRAINS, SWALES, PONDS AND RAIN GARDENS UNTIL SITE IS
FULLY STABILIZED.
6. CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION FOR
DOWNSPOUT CONNECTIONS, TO THE STORM DRAIN SYSTEM, UNTIL
CONNECTION IS ESTABLISHED WITH DOWNSPOUT.
7. INLET PROTECTION SHALL BE ADAPTED, AS NECESSARY, TO THE
SURROUNDING SURFACE TYPE AND CONDITION (i.e., STAKE-DRIVEN
WATTLES FOR BARE SOIL OR GRAVEL SOCKS FOR PAVEMENT, ETC.)
8. CONTRACTOR IS RESPONSIBLE FOR STABILIZING ALL SLOPES,
PARTICULARLY THOSE STEEPER THAN 6:1. CRIMP MULCHING, HYDRO
MULCHING, EROSION MATS, TEMPORARY IRRIGATION, AND ADDITIONAL
WATTLES OR SILT FENCING MAY BE NECESSARY TO ESTABLISH
VEGETATIVE COVER AND STABILIZE THE SLOPE.
9. CONTRACTOR IS RESPONSIBLE FOR PREVENTING SEDIMENT FROM
UNSTABILIZED LANDSCAPE AREAS FROM MIGRATING ONTO AND ENTERING
THE PERMEABLE PAVER SYSTEMS UNTIL UPGRADIENT TRIBUTARY AREAS
ARE FULLY STABILIZED.
10. ADDITIONAL WATTLES, SILT FENCE, OR OTHER MEASURES, MAY BE
NECESSARY TO ENSURE THAT EACH BUILDING PAD IS STABILIZED
THROUGHOUT CONSTRUCTION. AT NO TIME SHALL SEDIMENT BE
ALLOWED TO CROSS THE PUBLIC SIDEWALKS.
11. CONTRACTOR SHALL IMPLEMENT APPROPRIATE PERIMETER PROTECTION
FOR AREAS DIRECTING DRAINAGE OFFSITE. PERIMETER PROTECTION
SHALL BE ADAPTED, AS NECESSARY, TO THE SURROUNDING SURFACE
TYPE AND CONDITION (i.e., STAKE-DRIVEN SEDIMENT CONTROL LOGS OR
SILT FENCE FOR BARE SOIL, SAND BAGS OR GRAVEL SOCKS FOR
PAVEMENT, ETC.)
12. FUELING FACILITIES SHALL BE LOCATED AT LEAST ONE HUNDRED (100)
FEET FROM NATURAL BODY OF WATER, WETLAND, NATURAL DRAINAGE
WAY OR MANMADE DRAINAGE WAY. THE FUEL TANKS AND FUELING AREA
MUST BE SET IN A CONTAINMENT AREA THAT WILL NOT ALLOW A FUEL
SPILL TO DIRECTLY FLOW, SEEP, RUN OFF, OR BE WASHED INTO A BODY OF
WATER, WETLAND OR DRAINAGE WAY.
13. CONSTRUCTION WASTE STORAGE (DUMPSTERS) AND PORTABLE
SANITATION UNITS (CONSTRUCTION TOILETS) SHALL BE LOCATED AT
LEAST FIFTY (50) FEET FROM ANY STORMWATER INLET, WETLAND, OR
DRAINAGE WAY. SAID FACILITIES MUST BE SET IN A CONTAINMENT AREA
THAT WILL NOT ALLOW POLLUTANTS TO DIRECTLY FLOW, SEEP, RUN OFF,
OR BE WASHED INTO A BODY OF WATER, WETLAND OR DRAINAGE WAY.
DUMPSTERS SHALL BE LOCATED ON FLAT, STABLE GROUND, AND
CONSTRUCTION TOILETS SHALL BE STAKED DOWN.
14. THE CONTRACTOR AND ALL SUBCONTRACTORS WILL COOPERATE WITH
THE CITY'S CONSTRUCTION INSPECTORS BY CEASING OPERATIONS WHEN
WINDS ARE OF SUFFICIENT VELOCITY TO CREATE BLOWING DUST WHICH,
IN THE INSPECTOR'S OPINION, IS HAZARDOUS TO THE PUBLIC HEALTH AND
WELFARE.
15. WHERE SEASONAL CONSTRAINTS (E.G., DURING SUMMER AND WINTER
MONTHS) INHIBIT PERMANENT SEEDING OPERATIONS, DISTURBED AREAS
WILL BE TREATED WITH MULCH AND MULCH TACKIFIER OR OTHER
MATERIALS APPROVED BY EROSION CONTROL STAFF TO PREVENT
EROSION.
16. SEE LANDSCAPE PLANS FOR ADDITIONAL INFORMATION ON PLANTING,
REVEGETATION, HARDSCAPE AND OTHER PERMANENT SITE STABILIZATION
METHODS.
EROSION CONTROL NOTES:
NOTE:
ALL BMPS SHOWN ON THIS PLAN ARE GRAPHIC
REPRESENTATIONS ONLY. FINAL DETERMINATION OF SIZE
AND LOCATION SHALL BE DETERMINED BY THE CONTRACTOR
AND DOCUMENTED ON THE DYNAMIC SITE PLAN.
TABLE OF CONSTRUCTION SEQUENCE
AND BMP APPLICATION
Project: PATEROS CREEK
CONSTRUCTION PHASE MOBILIZATION DEMOLITION GRADING
BEST MANAGEMENT PRACTICES (BMPS)
STRUCTURAL "INSTALLATION"
Construction & Silt Fence Barriers *
Flow Barriers (Wattles) *
Inlet Filter Bags *
Rip Rap
Vegetative
Temporary Seeding Planting
Mulching / Sealant
Permanent Seeding Planting
Sod Installation
Rolled Products : Netting / Blankets / Mats
Contour Furrows (Ripping / Disking)
Sediment Basin
Rock Bags *
UTILITIES
INSTALLATION
FLAT WORK
INSTALLATION
VERTICAL
INSTALLATION LANDSCAPE DEMOBILIZATION
Vehicle Tracking Pad *
* All Temporary BMPs to be Removed once Construction is Complete
Other:
Any prior inlets that could use protecting
Any prior inlets that could use protecting
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
LEGEND:
PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
PROPOSED INLET
PROPOSED UNDERDRAIN UD
BENCHMARK/BASIS OF BEARING
BENCHMARK #1:
City of Fort Collins Benchmark 2-02:
Elevation= 4964.37
BENCHMARK #2:
City of Fort Collins Benchmark 16-01:
Elevation= 4956.98
Basis of Bearing
The Basis of Bearings is the East line of the Northeast Quarter of Section 7, as
bearing South 00°00'53" East (assumed bearing) as monumented on drawing.
WATTLE DIKE
INLET PROTECTION IP
VEHICLE TRACKING CONTROL PAD
VTC
SILT FENCE SF SF
ROCK SOCK RS
RIP RAP RR
1. CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED SLOPES BY
CRIMP MULCHING OR SIMILAR METHODS. CONTRACTOR TO USE CDOT STRAW
MULCH SPECS UNLESS OTHERWISE DIRECTED.
2. SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone________________________________
3. CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR CONCRETE
WASHOUT AREA IF ACCESS IS OFF PAVEMENT.
4. DRYWELLS AND BIORETENTION MEDIA TO BE INSTALLED AFTER STABILIZATION
OF OVERLOT GRADING.
5. ALL DISTURBED SOILS SHALL BE RESEEDED WITH A COVER CROP UPON
COMPLETION OF THE INFRASTRUCTURE IMPROVEMENTS. THE RECOMMENDED
SPECIES AND APPLICATION RATES OF PURE LIVE SEED FOR COVER CROPS
ARE AS FOLLOWS:
GREAT BASIN WILRYE 3LBS/ACRE
GREEN NEEDLEGRASS2LBS/ACRE
INDIAN RICEGRASS 1LBS/ACRE
SLENDER WHEATGRASS 2LBS/ACRE
THICKSPIKE WHEATGRASS 3LBS/ACRE
WESTERN WHEATGRASS 4LBS/ACRE
TRITICALE 10LBS/ACRE
WINTER WHEAT 5LBS/ACRE
6. REFER TO THE FINAL DRAINAGE AND EROSION CONTROL REPORT FOR
HANSEN PROPERTY DATED: APRIL 17, 2019 FOR ADDITIONAL INFORMATION.
GENERAL NOTES:
WD
TRAFFIC CONTROL BARRICADE TCB
CONCRETE WASH AREA CWA
SEDIMENT TRAP ST
CONSTRUCTION FENCE CF CF CF
LIMITS OF DISTURBANCE LOD
MULCH MU
Under slope stabilization rolled products. Reseeding may be required.
PEAK RELEASE=3.08 cfs
STORM SEWER A
SEE SHEET ST1
STORM SEWER A
SEE SHEET ST1
2a
OUTLET A3-4
SEE SHEET ST1
STORM SEWER B1
SEE SHEET ST3
OUTLET B1-4
SEE SHEET ST3
STORM SEWER A1
SEE SHEET ST2
3a
DETENTION POND 4
100-YR VOL=0.96 ac-ft
PEAK RELEASE=0.47 cfs
OUTLET A1-1
SEE SHEET ST2
3B 3b
STORM SEWER E
SEE SHEET ST4
STORM SEWER D
SEE SHEET ST4
STORM SEWER A3-1
SEE SHEET ST2
OUTLET A3-1.1
SEE SHEET ST2
STORM SEWER B
SEE SHEET ST2
STORM SEWER C
SEE SHEET ST2
1
1
2
3
4 4
STORM SEWER G
SEE SHEET ST5
STORM SEWER H
SEE SHEET ST5
STORM SEWER F
SEE SHEET ST5
1l 1b
X
X
B M
X
X
X
X
X
M
X
X
X
F.O.
NORTHWEST
1f
1e
1j
1i
1h
1g
1c
1k 1d
1I 1H
1G
1D
1F
1C
1K
1E
2B
2C
2
3
3
STORM SEWER I
SEE SHEET ST6
STORM SEWER J
SEE SHEET ST7
DR1
DRAINAGE EXHIBIT
OVERALL
56
Sheet
of 69
HANSEN SUBDIVISION These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
301 North Howes Street, Suite 100
Fort Collins, Colorado 80521
E NGINEER ING
N O R T H E RN
PHONE: 970.221.4158
www.northernengineering.com
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
Call before you dig.
R
KEYMAP
B M
VAULT
ELEC
TIMBERLINE RD
ZEPHYR RD
LEGEND:
ST
PROPOSED EASEMENT
EXISTING RIGHT OF WAY
PROPOSED LOT LINE
PROPERTY BOUNDARY
PROPOSED CURB AND GUTTER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CONTOUR
PROPOSED STORM INLET
PROPOSED STORM SEWER
EXISTING STORM SEWER
PROPOSED RIGHT OF WAY
A
DRAINAGE BASIN LABEL
DRAINAGE BASIN BOUNDARY
B2
1.45 ac
DESIGN POINT
FLOW ARROWS
1. EXISTING UNDERGROUND AND OVERHEAD PUBLIC AND PRIVATE
UTILITIES AS SHOWN ARE INDICATED ACCORDING TO THE BEST
INFORMATION AVAILABLE TO THE ENGINEER. THE ENGINEER DOES NOT
GUARANTEE THE ACCURACY OF SUCH INFORMATION. EXISTING UTILITY
MAINS AND SERVICES MAY NOT BE STRAIGHT LINES OR AS INDICATED
ON THESE DRAWINGS. THE CONTRACTOR SHALL BE RESPONSIBLE TO
CALL ALL UTILITY COMPANIES (PUBLIC AND PRIVATE) PRIOR TO ANY
CONSTRUCTION TO VERIFY EXACT UTILITY LOCATIONS.
2. REFER TO THE "FINAL DRAINAGE AND EROSION CONTROL REPORT FOR
HANSEN PROPERTY" BY NORTHERN ENGINEERING, DATED APRIL 17,
2019 FOR ADDITIONAL INFORMATION.
3. ALL PROJECT DATA IS ON THE CITY OF FORT COLLINS VERTICAL DATUM;
NAVD88. SEE COVER SHEET FOR BENCHMARK REFERENCES.
4. REFER TO THE PLAT FOR LOT AREAS, TRACT SIZES, EASEMENTS, LOT
DIMENSIONS, UTILITY EASEMENTS, OTHER EASEMENTS, AND OTHER
SURVEY INFORMATION.
5. SEE SHEET D4 FOR INLET SCHEDULE.
NOTES:
BASIN
DESIGNATION
BASIN
AREA (AC)
( IN FEET )
0
1 INCH = 150 FEET
150 150 300 450
NORTH
DRAINAGE SUMMARY TABLE
DESIGN
POINT
BASIN
ID
TOTAL
AREA
(acres)
C2 C100
2-yr
Tc
(min)
100-yr
Tc
(min)
Q2
(cfs)
Q100
(cfs)
1a 1A 10.43 0.43 0.54 17.0 15.2 7.96 36.43
1b 1B 0.49 0.48 0.59 9.4 8.0 0.54 2.52
1c 1C 0.39 0.79 0.99 5.8 5.0 0.85 3.81
1d 1D 0.97 0.80 1.00 8.9 6.9 1.82 8.75
1e 1E 1.33 0.61 0.76 12.8 9.6 1.63 7.97
1f 1F 8.16 0.61 0.77 24.2 21.1 7.30 34.11
1g 1G 2.27 0.59 0.74 13.9 11.8 2.62 12.24
1h 1H 2.36 0.81 1.00 10.8 7.7 4.15 20.29
1i 1I 9.80 0.58 0.72 23.6 20.7 8.34 39.10
1j 1J 0.73 0.67 0.84 5.0 5.0 1.39 6.05
1k 1K 0.33 0.80 1.00 5.2 5.0 0.75 3.27
1l 1L 0.60 0.44 0.55 8.9 8.0 0.62 2.84
1m 1M 2.70 0.65 0.82 10.8 8.2 3.84 18.51
1n 1N 2.76 0.66 0.83 12.8 9.7 3.67 17.95
2a 2A 2.81 0.28 0.35 15.1 14.1 1.46 6.55
2b 2B 0.99 0.78 0.98 5.0 5.0 2.20 9.62
2c 2C 0.43 0.73 0.92 6.0 5.0 0.87 3.94
2d 2D 0.62 0.82 1.00 8.4 7.4 1.21 5.42
2e 2E 0.21 0.81 1.00 5.0 5.0 0.48 2.08
2f 2F 0.26 0.82 1.00 5.0 5.0 0.61 2.60
2g 2G 1.36 0.66 0.83 15.7 10.9 1.66 8.53
2h 2H 6.17 0.65 0.81 9.2 6.7 9.23 45.40
2i 2I 1.22 0.89 1.00 6.7 5.5 2.82 12.12
2j 2J 0.46 0.80 1.00 5.5 5.0 1.04 4.53
2k 2K 1.74 0.69 0.87 11.9 7.7 2.52 12.96
2l 2L 3.68 0.35 0.44 18.6 16.6 2.18 10.08
3a 3A 2.06 0.95 1.00 5.7 5.0 5.41 20.53
3b 3B 1.02 0.86 1.00 14.5 13.1 1.67 7.08
3c 3C 0.33 0.86 1.00 5.0 5.0 0.82 3.30
4 4 3.10 0.95 1.00 6.7 5.3 7.60 30.80
50% On-Site Treatment by LID Summary Table for Single-Family Residences
Basin(s)
LID
Treatment
Total Basin(s)
Area (Ac.)
Rain Garden Req'd Min.
Vol. (Cu.-Ft.)
1A None (Pond) 10.43
1B, 1C, 1D, 1E, & 1F NE Rain Garden 11.34 6,794
1G, 1H, 1I, 1J, 1K, & 1L NW Rain Garden 16.08 9,506
1M & 1N None 5.46
2A None (Pond) 2.81
2B, 2C, 2D, 2E, 2I, & 2J None 3.92
2F, 2G, 2H, 2K, & 2L Site Specific 13.22
3A Site Specific 3.09
3B None 0.33
4 Site Specific 3.10
Total Site Area 69.78
Areas Requiring Site Specific LID Treatment
Multi-family lots (Tract D) 5.39 Acres
Multi-family lots (Tract E) 4.21 Acres
Local Commerical (Tract C) 4.55 Acres
Detention Pond (Tract L) 0.78 Acres
Detention Pond (Tract M)
0.50 Acres
Neighborhood Park (Tract B) 3.00 Acres
Total Newly Developed Area less Site Specific
Areas & Ponds
38.11 Acres
Total Newly Developed Area Treated 27.42 Acres
Percent of Newly Developed Area Treated 71.9%
Pond Summary Table
Pond ID 100-Yr Detention Vol.
(AC.-Ft.) Peak Release (cfs)
1 10.01 3.08
2 1.85 3.48
3 2.24 9.89
4 0.96 0.47
5 0.81 0.60
PROPOSED SWALE 1 1
Permit is obtained, if applicable.
23. The Developer shall be responsible for obtaining all necessary permits for all applicable agencies prior to commencement of construction.
The Developer shall notify the the City of Fort Collins Inspector (Fort Collins - 221-6605) and the City of Fort Collins Erosion Control
Inspector (Fort Collins - 221-6700) at least 2 working days prior to the start of any earth disturbing activity, or construction on any and all
public improvements. If the City of Fort Collins Engineer is not available after proper notice of construction activity has been provided, the
Developer may commence work in the Engineer's absence. However, the City of Fort Collins reserves the right not to accept the
improvement if subsequent testing reveals an improper installation.
24. The Developer shall be responsible for obtaining soils tests within the Public Right-of-Way after right of way grading and all utility trench
work is complete and prior to the placement of curb, gutter, sidewalk and pavement. If the final soils/pavement design report does not
correspond with the results of the original geotechnical report, the Developer shall be responsible for a re-design of the subject pavement
section or, the Developer may use the City of Fort Collins' default pavement thickness section(s). Regardless of the option used, all final
soils/pavement design reports shall be prepared by a licensed Professional Engineer. The final report shall be submitted to the Inspector a
minimum of 10 working days prior to placement of base and asphalt. Placement of curb, gutter, sidewalk, base and asphalt shall not occur
until the City of Fort Collins Engineer approves the final report.
25. The contractor shall hire a licensed engineer or land surveyor to survey the constructed elevations of the street subgrade and the gutter
flowline at all intersections, inlets, and other locations requested by the the City of Fort Collins inspector. The engineer or surveyor must
certify in a letter to the City of Fort Collins that these elevations conform to the approved plans and specifications. Any deviations shall be
noted in the letter and then resolved with the City of Fort Collins before installation of base course or asphalt will be allowed on the streets.
26. All utility installations within or across the roadbed of new residential roads must be completed prior to the final stages of road construction.
For the purposes of these standards, any work except c/g above the subgrade is considered final stage work. All service lines must be
stubbed to the property lines and marked so as to reduce the excavation necessary for building connections.
27. Portions of Larimer County are within overlay districts. The Larimer County Flood Plain Resolution should be referred to for additional
criteria for roads within these districts.
28. All road construction in areas designated as Wild Fire Hazard Areas shall be done in accordance with the construction criteria as
established in the Wild Fire Hazard Area Mitigation Regulations in force at the time of final plat approval.
29. Prior to the commencement of any construction, the contractor shall contact the Local Entity Forester to schedule a site inspection for any
tree removal requiring a permit.
30. The Developer shall be responsible for all aspects of safety including, but not limited to, excavation, trenching, shoring, traffic control, and
security. Refer to OSHA Publication 2226, Excavating and Trenching.
31. The Developer shall submit a Construction Traffic Control Plan, in accordance with MUTCD, to the appropriate Right-of-Way authority. (The
the City of Fort Collins, Larimer County, Colorado), for approval, prior to any construction activities within, or affecting, the Right-of-Way.
The Developer shall be responsible for providing any and all traffic control devices as may be required by the construction activities.
32. Prior to the commencement of any construction that will affect traffic signs of any type, the contractor shall contact the City of Fort Collins
Traffic Operations Department, who will temporarily remove or relocate the sign at no cost to the contractor, however, if the contractor
moves the traffic sign then the contractor will be charged for the labor, materials and equipment to reinstall the sign as needed.
33. The Developer is responsible for all costs for the initial installation of traffic signing and striping for the Development related to the
Development's local street operations. In addition, the Developer is responsible for all costs for traffic signing and striping related to directing
traffic access to and from the Development.
34. There shall be no site construction activities on Saturdays, unless specifically approved by the City of Fort Collins Engineer, and no site
construction activities on Sundays or holidays, unless there is prior written approval by Larimer County.
35. The Developer is responsible for providing all labor and materials necessary for the completion of the intended improvements, shown on
these drawings, or designated to be provided, installed, or constructed, unless specifically noted otherwise.
36. Dimensions for layout and construction are not to be scaled from any drawing. If pertinent dimensions are not shown, contact the Designer
for clarification, and annotate the dimension on the as-built record drawings.
37. The Developer shall have, onsite at all times, one (1) signed copy of the approved plans, one (1) copy of the appropriate standards and
specifications, and a copy of any permits and extension agreements needed for the job.
38. If, during the construction process, conditions are encountered which could indicate a situation that is not identified in the plans or
specifications, the Developer shall contact the Designer and the City of Fort Collins Engineer immediately.
39. The Developer shall be responsible for recording as-built information on a set of record drawings kept on the construction site, and available
to the Larimer County's Inspector at all times. Upon completion of the work, the contractor(s) shall submit record drawings to the City of Fort
Collins Engineer.
40. The Designer shall provide, in this location on the plan, the location and description of the nearest survey benchmarks (2) for the project as
well as the basis of bearings. The information shall be as follows:
PROJECT DATUM: NAVD88
BENCHMARK 2-02 EAST SIDE OF TIMBERLAND ROAD, 1/2 MILE NORTH OF TRILBY ROAD, ON THE MIDDLE CONCRETE PAD TO
AN ELECTRIC BOX.
ELEVATION: 4964.37
BENCHMARK 16-01 SOUTH SIDE OF WILLOW SPRINGS WAY APPROX. 50 FT. WEST OF THE INTERSECTION OF WILLOW
SPRINGS WAY AND TIMBERLINE ROAD ON THE SOUTHWEST CORNER OF A STORM INLET.
ELEVATION: 4956.98
PLEASE NOTE: THIS PLAN SET IS USING NAVD88 FOR A VERTICAL DATUM. SURROUNDING DEVELOPMENTS HAVE USED
NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) FOR THEIR VERTICAL DATUMS.
IF NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) IS REQUIRED FOR ANY PURPOSE, THE FOLLOWING
EQUATION SHOULD BE USED: NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) = NAVD88 - 3.19'
BASIS OF BEARINGS
THE BASIS OF BEARINGS IS THE EAST LINE OF THE NORTHEAST QUARTER OF SECTION 7, AS BEARING SOUTH 00°00'53"
EAST (ASSUMED BEARING) AS MONUMENTED ON DRAWING.
41. All stationing is based on centerline of roadways unless otherwise noted.
42. Damaged curb, gutter and sidewalk existing prior to construction, as well as existing fences, trees, streets, sidewalks, curbs and gutters,
landscaping, structures, and improvements destroyed, damaged or removed due to construction of this project, shall be replaced or restored
in like kind at the Developer's expense, unless otherwise indicated on these plans, prior to the acceptance of completed improvements
and/or prior to the issuance of the first Certificate of Occupancy.
43. When an existing asphalt street must be cut, the street must be restored to a condition equal to or better than its original condition. The
existing street condition shall be documented by the City of Fort Collins Construction Inspector before any cuts are made. Patching shall be
done in accordance with the City of Fort Collins Street Repair Standards. The finished patch shall blend in smoothly into the existing
surface. All large patches shall be paved with an asphalt lay-down machine. In streets where more than one cut is made, an overlay of the
entire street width, including the patched area, may be required. The determination of need for a complete overlay shall be made by the
Larimer County Engineer and/or the City of Fort Collins Inspector at the time the cuts are made.
44. Upon completion of construction, the site shall be cleaned and restored to a condition equal to, or better than, that which existed before
construction, or to the grades and condition as required by these plans.
45. Standard Handicap ramps are to be constructed at all curb returns and at all "T" intersections.
46. After acceptance by the City of Fort Collins, public improvements depicted in these plans shall be guaranteed to be free from material and
workmanship defects for a minimum period of two years from the date of acceptance.
47. The City of Fort Collins shall not be responsible for the maintenance of roadway and appurtenant improvements, including storm drainage
structures and pipes, for the following private streets: N.A.
48. Approved Variances are listed as follows: Twisted Root Right-Turn Lane Variance
CONSTRUCTION NOTES
A. Grading and Erosion Control Notes
1. The erosion control inspector must be notified at least twenty-four (24) hours prior to any construction on this site.
2. There shall be no earth-disturbing activity outside the limits designated on the accepted plans.
3. All required perimeter silt and construction fencing shall be installed prior to any land disturbing activity (stockpiling, stripping, grading, etc).
All other required erosion control measures shall be installed at the appropriate time in the construction sequence as indicated in the
approved project schedule, construction plans, and erosion control report.
4. At all times during construction, the Developer shall be responsible for preventing and controlling on-site erosion including keeping the
property sufficiently watered so as to minimize wind blown sediment. The Developer shall also be responsible for installing and maintaining
all erosion control facilities shown herein.
5. Pre-disturbance vegetation shall be protected and retained wherever possible. Removal or disturbance of existing vegetation shall be
limited to the area(s) required for immediate construction operations, and for the shortest practical period of time.
6. All soils exposed during land disturbing activity (stripping, grading, utility installations, stockpiling, filling, etc.) shall be kept in a roughened
condition by ripping or disking along land contours until mulch, vegetation, or other permanent erosion control BMPs are installed. No soils
in areas outside project street rights-of-way shall remain exposed by land disturbing activity for more than thirty (30) days before required
temporary or permanent erosion control (e.g. seed/mulch, landscaping, etc.) is installed, unless otherwise approved by the City/County.
7. In order to minimize erosion potential, all temporary (structural) erosion control measures shall:
a. Be inspected at a minimum of once every two (2) weeks and after each significant storm event and repaired or reconstructed as
necessary in order to ensure the continued performance of their intended function.
b. Remain in place until such time as all the surrounding disturbed areas are sufficiently stabilized as determined by the erosion control
inspector.
c. Be removed after the site has been sufficiently stabilized as determined by the erosion control inspector.
8. When temporary erosion control measures are removed, the Developer shall be responsible for the clean up and removal of all sediment
and debris from all drainage infrastructure and other public facilities.
9. The contractor shall immediately clean up any construction materials inadvertently deposited on existing streets, sidewalks, or other public
rights of way, and make sure streets and walkways are cleaned at the end of each working day.
10. All retained sediments, particularly those on paved roadway surfaces, shall be removed and disposed of in a manner and location so as not
to cause their release into any waters of the United States.
11. No soil stockpile shall exceed ten (10) feet in height. All soil stockpiles shall be protected from sediment transport by surface roughening,
watering, and perimeter silt fencing. Any soil stockpile remaining after thirty (30) days shall be seeded and mulched.
12. The stormwater volume capacity of detention ponds will be restored and storm sewer lines will be cleaned upon completion of the project
and before turning the maintenance over to the City/County or Homeowners Association (HOA).
13. City Ordinance and Colorado Discharge Permit System (CDPS) requirements make it unlawful to discharge or allow the discharge of any
pollutant or contaminated water from construction sites. Pollutants include, but are not limited to discarded building materials, concrete
truck washout, chemicals, oil and gas products, litter, and sanitary waste. The developer shall at all times take whatever measures are
necessary to assure the proper containment and disposal of pollutants on the site in accordance with any and all applicable local, state, and
federal regulations.
14. A designated area shall be provided on site for concrete truck chute washout. The area shall be constructed so as to contain washout
material and located at least fifty (50) feet away from any waterway during construction. Upon completion of construction activities the
concrete washout material will be removed and properly disposed of prior to the area being restored.
15. Conditions in the field may warrant erosion control measures in addition to what is shown on these plans. The Developer shall implement
whatever measures are determined necessary, as directed by the City.
B. Street Improvement Notes
1. All street construction is subject to the General Notes on the cover sheet of these plans as well as the Street Improvements Notes listed
here.
2. A paving section design, signed and stamped by a Colorado licensed Engineer, must be submitted to the City of Fort Collins Engineer for
approval, prior to any street construction activity, (full depth asphalt sections are not permitted at a depth greater than 8 inches of asphalt).
The job mix shall be submitted for approval prior to placement of any asphalt.
3. Where proposed paving adjoins existing asphalt, the existing asphalt shall be saw cut, a minimum distance of 12 inches from the existing
edge, to create a clean construction joint. The Developer shall be required to remove existing pavement to a distance where a clean
construction joint can be made. Wheel cuts shall not be allowed unless approved by the City of Fort Collins Engineer in Fort Collins.
4. Street subgrades shall be scarified the top 12 inches and re-compacted prior to subbase installation. No base material shall be laid until the
subgrade has been inspected and approved by the City of Fort Collins Engineer.
5. Ft. Collins only. Valve boxes and manholes are to be brought up to grade at the time of pavement placement or overlay. Valve box adjusting
rings are not allowed.
6. When an existing asphalt street must be cut, the street must be restored to a condition equal to or better than its original condition. The
existing street condition shall be documented by the Inspector before any cuts are made. Cutting and patching shall be done in
conformance with Chapter 25, Reconstruction and Repair. The finished patch shall blend smoothly into the existing surface. The
determination of need for a complete overlay shall be made by the City of Fort Collins Engineer. All overlay work shall be coordinated with
adjacent landowners such that future projects do not cut the new asphalt overlay work.
7. All traffic control devices shall be in conformance with these plans or as otherwise specified in M.U.T.C.D. (including Colorado supplement)
and as per the Right-of-Way Work Permit traffic control plan.
8. The Developer is required to perform a gutter water flow test in the presence of the City of Fort Collins Inspector and prior to installation of
asphalt. Gutters that hold more than 1/4 inch deep or 5 feet longitudinally, of water, shall be completely removed and reconstructed to drain
properly.
9. Prior to placement of H.B.P. or concrete within the street and after moisture/density tests have been taken on the subgrade material (when a
full depth section is proposed) or on the subgrade and base material (when a composite section is proposed), a mechanical "proof roll" will
be required. The entire subgrade and/or base material shall be rolled with a heavily loaded vehicle having a total GVW of not less than
50,000 lbs. and a single axle weight of at least 18,000 lbs. with pneumatic tires inflated to not less that 90 p.s.i.g. "Proof roll" vehicles shall
not travel at speeds greater than 3 m.p.h. Any portion of the subgrade or base material which exhibits excessive pumping or deformation, as
determined by the City of Fort Collins Engineer, shall be reworked, replaced or otherwise modified to form a smooth, non-yielding surface.
The City of Fort Collins Engineer shall be notified at least 24 hours prior to the "proof roll." All "proof rolls" shall be preformed in the presence
of an Inspector.
C. Traffic Signing and Pavement Marking Construction Notes
1. All signage and marking is subject to the General Notes on the cover sheet of these plans, as well as the Traffic Signing and Marking
Construction Notes listed here.
2. All symbols, including arrows, ONLYS, crosswalks, stop bars, etc. shall be pre-formed thermo-plastic.
3. All signage shall be per the City of Fort Collins Standards and these plans or as otherwise specified in MUTCD.
4. All lane lines for asphalt pavement shall receive two coats of latex paint with glass beads.
5. All lane lines for concrete pavement should be epoxy paint.
6. Prior to permanent installation of traffic striping and symbols, the Developer shall place temporary tabs or tape depicting alignment and
placement of the same. Their placement shall be approved by the City of Fort Collins Traffic Engineer prior to permanent installation of
striping and symbols.
7. Pre-formed thermo-plastic applications shall be as specified in these Plans and/or these Standards.
8. Epoxy applications shall be applied as specified in CDOT Standard Specifications for Road and Bridge Construction.
9. All surfaces shall be thoroughly cleaned prior to installation of striping or markings.
10. All sign posts shall utilize break-away assemblies and fasteners per the Standards.
11. A field inspection of location and installation of all signs shall be performed by the City of Fort Collins Traffic Engineer. All discrepancies
identified during the field inspection must be corrected before the 2-year warranty period will begin.
12. The Developer installing signs shall be responsible for locating and protecting all underground utilities.
13. Special care shall be taken in sign location to ensure an unobstructed view of each sign.
14. Signage and striping has been determined by information available at the time of review. Prior to initiation of the warranty period,the City of
Fort Collins Traffic Engineer reserves the right to require additional signage and/or striping if the City of Fort Collins Traffic Engineer
determines that an unforeseen condition warrants such signage according to the MUTCD or the CDOT M and S Standards. All signage and
striping shall fall under the requirements of the 2-year warranty period for new construction (except fair wear on traffic markings).
15. Sleeves for sign posts shall be required for use in islands/medians. Refer to Chapter 14, Traffic Control Devices, for additional detail.
D. Storm Drainage Notes
1. The City of Fort Collins shall not be responsible for the maintenance of storm drainage facilities located on private property. Maintenance of
onsite drainage facilities shall be the responsibility of the property owner(s).
2. All recommendations of the Final Drainage and Erosion Control Report for Hansen Property dated April 17, 2019 by Northern Engineering
Services, Inc., shall be followed and implemented.
3. Prior to final inspection and acceptance by the City of Fort Collins, certification of the drainage facilities, by a registered engineer, must by
submitted to and approved by the Stormwater Utility Department. Certification shall be submitted to the Stormwater Utility Department at
least two weeks prior to the release of a certificate of occupancy for single family units. For commercial properties, certification shall by
submitted to the Stormwater Utility Department at least two weeks prior to the release of any building permits in excess of those allowed
prior to certification per the Development Agreement.
E. Utility Notes
1. All waterline construction shall conform to the Fort Collins-Loveland Water District Standard Construction Specifications current at the date
of construction.
2. All sanitary sewer construction shall conform to the South Fort Collins Sanitation District Standard Construction Specifications current at the
date of construction.
3. The contractor shall maintain a minimum of 10 feet of horizontal separation and 18 inches of vertical separation between all sewer and
water lines.
4. Minimum depth of cover over water mains shall be 5.0 feet and maximum cover shall be 6.0 feet.
5. Manhole rim elevations are to be adjusted to 1/4" below finished grade. If necessary, cone sections shall be rotated to prevent lids being
located within bicycle or vehicle wheel paths.
6. The size, type and location of all known underground utilities are approximate when shown on these drawings. It shall be the responsibility
of the contractor to verify the existence of all underground utilities in the area of the work. Before commencing new construction, the
contractor shall be responsible for locating all underground utilities and shall be responsible for all unknown underground utilities.
7. All water fittings and valves are only graphically represented and are not to scale.
CS2
CONSTRUCTION NOTES
GENERAL AND
2
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.
Call before you dig.
R
Sheet
of 69
HANSEN SUBDIVISION These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
301 North Howes Street, Suite 100
Fort Collins, Colorado 80521
E NGINEER ING
N O R T H E RN
PHONE: 970.221.4158
www.northernengineering.com
212 N. Wahsatch Ave., Suite 301
Colorado Springs, Colorado 80903
(719) 635-3200
SHEET INDEX
ENGINEER ING
N O R T H E RN
ENGINEER ING
N O R T H E RN
UTILITY CONTACT LIST: *
UTILITY COMPANY PHONE NUMBER
1 CS1 COVER SHEET
2 CS2 GENERAL AND CONSTRUCTION NOTES
3 CS3 STREET CROSS-SECTIONS
4 EX1 EXISTING CONDITIONS AND DEMOLITION PLAN
5 OU1 OVERALL UTILITY PLAN
6-9 U1-U4 UTILITY PLAN
10 OG1 OVERALL GRADING PLAN
11-17 G1-G7 GRADING PLAN
18-19 G8-G9 DETAILED GRADING PLAN
20-22 SS1-SS3 SANITARY SEWER LINE 1 PLAN AND PROFILE
23-25 SS4-SS6 SANITARY SEWER LINE 4 PLAN AND PROFILE
26 SS7 SANITARY SEWER LINE 10 PLAN AND PROFILE
27 SS8 SANITARY SEWER LINE 10-1 PLAN AND PROFILE
29 ST1 STORM DRAIN LINE A PLAN AND PROFILE
30 ST2 STORM DRAIN LINES A1, A3-1, B, & C PLAN AND PROFILE
31 ST3 STORM DRAIN LINE B1 PLAN AND PROFILE
32 ST4 STORM DRAIN LINE E & D PLAN AND PROFILE
33 ST5 STORM DRAIN LINES F, G, & H PLAN AND PROFILE
34 ST6 STORM DRAIN LINE I PLAN AND PROFILE
35 ST7 STORM DRAIN LINE J PLAN AND PROFILE
36 IR1 IRRIGATION LINES A, B, & C PLAN AND PROFILE
37-39 R1-R3 HAPPY WOODLAND DR AND FLOATING LEAF DR PLAN AND PROFILE
40 R4 BURLY TREE DR PLAN AND PROFILE
41-43 R5-R7 HAPPY WOODLAND DR AND KNOBBY PINE DR PLAN AND PROFILE
44-45 R8-R9 FALLEN BRANCH DR & TWISTED ROOT DR PLAN AND PROFILE
46 R10 ZEPHYR ROAD PLAN AND PROFILE
47-49 R11-R13 TIMBERLINE ROAD PLAN AND PROFILE
50-53 R14-R17 STRIPING PLAN
56 DR1 OVERALL DRAINAGE EXHIBIT
57-59 D1-D3 UTILITY DETAILS
60-62 D4-D6 DRAINAGE DETAILS
63 D7 IRRIGATION DETAILS
64-66 D8-D10 UTILITY DETAILS
67 D11 GRADING DETAILS
68 EC1 EROSION CONTROL PLAN
69 EC2 EROSION CONTROL DETAILS
A TRACT OF LAND LOCATED IN THE EAST HALF OF SECTION 7, TOWNSHIP 6 NORTH, RANGE 68 WEST OF
THE 6TH P.M., CITY OF FORT COLLINS, COUNTY OF LARIMER, STATE OF COLORADO
HANSEN SUBDIVISION
UTILITY PLANS FOR
OWNER/APPLICANT
SITE ENGINEER
SURVEYOR
GAS----------------- Xcel Energy-----------------------------------Stephanie Rich (970) 225-7857
ELECTRIC-------- City of Fort Collins Light & Power------- Austin Kreager (970) 224-6152
CABLE------------- Comcast--------------------------------------- Don Kapperman (970) 567-0245
TELECOM-------- CenturyLink Local Network--------------- William Johnson (970) 377-6401
WATER------------ Fort Collins-Loveland Water District---- (970) 226-3104
WASTEWATER- South Fort Collins Sanitation District--- (970) 226-3104
STORMWATER- City of Fort Collins Utilities---------------- Wes Lamarque (970) 416-2418
* This list is provided as a courtesy reference only. Northern Engineering Services assumes no responsibility for
the accuracy or completeness of this list. In no way shall this list relinquish the Contractor's responsibility for
locating all utilities prior to commencing any construction activity. Please contact the Utility Notification Center of
Colorado (UNCC) at 811 for additional information.
Kristin Turner
TB Group
444 Mountain Avenue
Berthoud, Colorado 80513
(970) 532-5891
PLANNER/
LANDSCAPE ARCHITECT
PROJECT DATUM: NAVD88
BENCHMARK 2-02 EAST SIDE OF TIMBERLAND ROAD, 1/2 MILE NORTH OF TRILBY
ROAD, ON THE MIDDLE CONCRETE PAD TO AN ELECTRIC BOX.
ELEVATION: 4964.37
BENCHMARK 16-01 SOUTH SIDE OF WILLOW SPRINGS WAY APPROX. 50 FT. WEST OF
THE INTERSECTION OF WILLOW SPRINGS WAY AND TIMBERLINE ROAD ON THE
SOUTHWEST CORNER OF A STORM INLET.
ELEVATION: 4956.98
PLEASE NOTE: THIS PLAN SET IS USING NAVD88 FOR A VERTICAL DATUM.
SURROUNDING DEVELOPMENTS HAVE USED NGVD29 UNADJUSTED DATUM (PRIOR
CITY OF FORT COLLINS DATUM) FOR THEIR VERTICAL DATUMS.
IF NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) IS REQUIRED
FOR ANY PURPOSE, THE FOLLOWING EQUATION SHOULD BE USED: NGVD29
UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) = NAVD88 - 3.19'
BASIS OF BEARINGS
THE BASIS OF BEARINGS IS THE EAST LINE OF THE NORTHEAST QUARTER OF
SECTION 7, AS BEARING SOUTH 00°00'53" EAST (ASSUMED BEARING) AS
MONUMENTED ON DRAWING.
PROJECT BENCHMARKS:
Sheet
of 69
HANSEN SUBDIVISION These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
301 North Howes Street, Suite 100
Fort Collins, Colorado 80521
E NGINEER ING
N O R T H E RN
PHONE: 970.221.4158
www.northernengineering.com
All changes, addendums, additions, deletions and
modifications to these drawings must be approved,
in writing, by the Fort Collins-Loveland
Water District and the South Fort Collins Sanitation District.
Mr. Terry Farrill, P.E., District Engineer Date
FORT COLLINS - LOVELAND
WATER DISTRICT
SOUTH FORT COLLINS
SANITATION DISTRICT