HomeMy WebLinkAboutGUARDIAN SELF STORAGE - FDP210018 - SUBMITTAL DOCUMENTS - ROUND 3 - STORMWATER MANAGEMENT PLANStormwater Management Plan
For
Guardian Storage Fort Collins
September 2021
Prepared for:
Guardian Storage Fort Collins
Prepared by:
JR Engineering, LLC
2900 South College Avenue, Suite 3D
Fort Collins, Colorado 80525
Contact: Tim Halopoff, P.E.
(303) 267-6230
JR Project No. 39737.01
Guardian Storage Fort Collins
Stormwater Management Plan
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Project Name and Location:Guardian Storage Fort Collins
Lot 1 and Tract A of the Discount Tire at Fossil Creek
Subdivision located in the southwest Quarter of Section
1, Township 6 north, Range 69 west of the 6th P.M. City
of Fort Collins, County of Larimer, State of Colorado.
Owners’ Name and Address:Guardian Storage
1155 South 76th Street
Superior, CO 80027
CERTIFICATION
I herby affirm that this Stormwater Management Plan for the Guardian Storage Fort
Collins project was prepared under my direct supervision in accordance with the
provisions of the Colorado Water Quality Control Act and the City of Fort Collins
Stormwater Criteria Manual. JR Engineering does not and will not assume liability for
the implementation of the methods, requirements and standards set forth in this
report.
Contractor names and Addresses:Contractor to complete this section.
_______________________________________________________________________
(Contractor’s Name)
_______________________________________________________________________
(Contractor’s Address)
_______________________________________________________________________
(Contact) (Position or Title)
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STORMWATER MANAGEMENT PLAN CERTIFICATION
“I certify under penalty of law that I have personally examined and am familiar
with the information submitted in this application and all attachments and that,
based on my inquiry of those individuals immediately responsible for obtaining
the information, I believe that the information is true, accurate and complete. I
am aware that there are significant penalties for submitting false information,
including the possibility of fine or imprisonment.
“I understand the submittal of the application is for coverage under the state of
Colorado General Permit for Stormwater Discharges Associated with
Construction Activity for the entirety of the construction site/project described
and applied for, until such time as the application is amended or the certification
is transferred, inactivated, or expired.”
"This Stormwater Management Plan fulfills the City of Fort Collins’ technical
criteria to the best of my knowledge. I understand that additional erosion and
sediment control measures may be needed if unforeseen erosion problems
occur or if the submitted Plan does not function as intended. The requirements
of this Plan shall run with the land and be the obligation of the land owner or
contractor until such time as the plan is properly completed, modified,
inactivated or voided."
______________________________________________________________________
Signature of Legally Responsible Person Date Signed
______________________________________________________________________
Name (printed)Title
Guardian Storage Fort Collins
Stormwater Management Plan
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TABLE OF CONTENTS
1.0 SITE DESCRIPTION ............................................................................................. 1
1.1.Introduction................................................................................................... 1
1.2.Current Conditions......................................................................................... 1
1.3.Nature and Purpose of Construction .............................................................. 1
1.4.Wetlands and Receiving Waters..................................................................... 2
1.5.Rainfall Erodibility & Erosion Sediment Control Methods............................... 2
1.6.Non-Stormwater Discharge............................................................................ 3
2.0 STORMWATER MANAGEMENT CONTROLS ........................................................ 4
2.1.Controls Overview ......................................................................................... 4
2.2.Erosion and Sediment Controls ...................................................................... 4
2.2.1.Structural Practices (See drawings for locations) ........................................ 5
2.2.2.Non-Structural Practices (See drawings for locations) ................................ 6
2.2.3.Other Controls (See drawings for location) ................................................. 7
2.3.SWMP Administrator ..................................................................................... 8
2.4.Materials Management ................................................................................. 8
2.4.1.Potential Pollution Sources ........................................................................ 8
2.4.2.Pollution Prevention Measures .................................................................. 9
2.5.Spill Management ........................................................................................ 13
3.0 Dry Land Vegetation ........................................................................................ 14
3.1.Soil and Surface Conditions .......................................................................... 14
3.2.Seed Mixes .................................................................................................. 14
3.3.Mulches ....................................................................................................... 14
4.0 Detailed Sequence of Construction Activities .................................................. 15
5.0 Inspection and Maintenance ........................................................................... 15
5.1.Inspection and Maintenance Overview ........................................................ 15
5.2.Final stabilization and long term stormwater management ......................... 17
6.0 CONCLUSION ................................................................................................... 18
7.0 REFERENCES .................................................................................................... 19
APPENDICES
Appendix A – Figures
Figure 1-Vicinity Map
Figure 2-Soil Map
Figure 3-ESCROW
Appendix B –Erosion Control Plan
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1.0 SITE DESCRIPTION
1.1. Introduction
This report represents the Stormwater Management Plan for construction of the
Guardian Storage site. It was prepared to meet the regulatory requirements of the
City of Fort Collins Stormwater Criteria Manual as well as the Colorado Department
of Health, Water Quality Control Division in compliance with the provisions of the
Colorado Water Quality Control Act, and the Federal Water Pollution Control Act.
This plan serves as a consolidated document for information on water quality
protection for the subject site and areas immediately adjacent. It should also be
noted that this plan is a living document that will need to be updated and
maintained throughout the construction process. The intent of this plan is to
provide the contractor a tool to consolidate records, logs, permits, applications, etc.
as well as guidance on water quality protection. The plan incorporates elements
that can be found in the contract plans and specifications as well as in the City of
Fort Collins Stormwater Criteria Manual.
1.2. Current Conditions
The Guardian Storage site is located in the North West Quarter of the South West
Quarter of Section 1, Township 6 North, Range 69 West of the 6th Principal Meridian
in the City of Fort Collins, Larimer County, Colorado. More specifically, the site is a
1.857 acre property that is currently undeveloped. The Fossil Creek Design Center
PUD lies to the north of the site. Directly to the east of this site are lots one through
four of the Phase 1 Fossil Creek Meadows subdivision. Across Fossil Creek Pkwy to
the south lies Lot 2 of Discount Tire at Fossil Creek. The site is located adjacent to S.
Collage Ave, and Fossil Creek Pkwy.
The Guardian Self Storage site is 1.857 acres at the northeast corner to S. College
Ave and Fossil Creek Pkwy. The existing site currently has dirt stockpiled on-site. The
existing site generally slopes from northwest to southeast with slopes ranging
between 0.70% and 25%. The property is generally covered with sparse native
grasses. The site currently drains from the northwest corner to the southeast corner
to an existing 29”x45” HERCP which outfalls to Fossil Creek, which is located
approximately 190 feet south of the site. The site is tributary to the Fossil Creek
drainage basin.
1.3. Nature and Purpose of Construction
The proposed site is Lot 1 of the Discount Tire at Fossil Creek Subdivision; and is
bounded to the north by an existing private drive, to the west by S. College Avenue,
to the south by Fossil Creek Parkway, and to the east by the residential lots of the
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Stormwater Management Plan
Fossil Creek Meadows subdivision. The proposed development of the site includes
completing Snead Drive from the northern boundary to Fossil Creek Parkway, a
29,800 sf storage building and associated improvements, as well as providing
wetland/ natural area on the east side of Snead Drive adjacent to the existing
residential lots. The total approximate disturbed area is 3.5 acres.
1.4. Wetlands and Receiving Waters
The site is a part of the Fossil Creek Drainage Basin and has existing wetlands on-
site. The site is on FEMA FIRM panel 08069C1000F. The flood map for this location
has a status of "not printed". This means that the entire area of the panel is in a
single flood zone, so FEMA chose to economize and not create a printable image for
this location. The site lies within FEMA Zone X, areas which are determined to be
outside the 0.2% annual chance floodplain. The site is not located within a FEMA
regulated floodplain, but the eastern portion of the site is located within the City of
Fort Collins Fossil Creek floodplain and is characterized by the city as “High Flood
Risk – Floodway” as shown in Appendix A, FC Maps – Guardian Self Storage.
1.5. Rainfall Erodibility & Erosion Sediment Control Methods
Attached at the end of the this report are a series of drawings that describe the
proposed site conditions, as well as the locations of the erosion control Best
Management Practices (BMPs). The Erosion Control Plan depicts the anticipated
drainage patterns after grading activities and the anticipated locations for BMPs
such as silt fence, inlet protection, and staging areas. It has been assumed that the
majority of the surrounding areas will remain in their present state during the
construction of this project.
The Contractor will be responsible for implementing and maintaining the erosion
and sediment control measures described in the document and the accompanying
design drawings. The Contractor may designate these tasks to certain
subcontractors as they see fit, but the ultimate responsibility for implementing these
controls and their proper function at each phase of the project remains with the
Contractor. Due to the sites proximity to existing commercial parking and residential
development, the contractor will be responsible for thorough site cleanup day to
day. The order of major activities will be as follows:
1.Install vehicle tracking control and other perimeter soil erosion control
measures.
2.Clear and rough grade for improvements.
3.Excavate and install improvements including underground piping, manholes,
and drainage structures.
4.Fine grading.
5.Final stabilization.
6.Clean up.
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Construction Sequence Chart
Mobilization Demolition Grading
Utilities
Installation
Flat work
Installation
Vertical
Installation Landscape Demobilization
Best Management
Practices (BMPs)
Structural "Installation"
Silt Fence Barriers*
Vehicle Tracking Pad*
Inlet Filter Bags*
Any prior inlets that could use
protecting
Rock Bags*
Any prior inlets that could use
protecting
Rip Rap
Collecting Asphalt /
Concrete Saw Cutting
Waste
*All BMPs to be Removed once Construction is Complete.
Vegetative
Temporary Seeding
Planting Any time the site will sit dorment longer than 30 Days.
Mulching/Sealant Any time the site will sit dorment longer than 30 Days.
Permanent Seeding
Planting
Sod Installation
Rolled Products :
Netting/Blankets/Mats
Any time the site will sit dorment longer than 30 Days.
1.6. Non-Stormwater Discharge
Non-stormwater discharges will be eliminated or reduced to the fullest extent
feasible. This plan does not cover construction dewatering. Pumping or draining
groundwater that has infiltrated into an excavation requires a general permit for
construction dewatering, regardless of the size of the project. Stormwater that
mixes with groundwater in an excavation is also subject to the controls in the
general permit for Construction Dewatering.
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No materials shall be discharged in quantities that will have an adverse effect on the
receiving waters. The measures listed below will be implemented to achieve these
objectives.
Proper and lawful disposal of all waste materials.
Control any spills and leaks that may occur and clean up (mitigate).
Use of designated areas for equipment repair and cleaning.
Careful application of irrigation water.
All potential pollutants used during construction other than sediment, will be
handled and disposed of in a manner that does not contaminate storm water.
All materials used during construction, which have the potential to impact storm
water quality will be stored, managed, used and disposed of in a manner that
minimizes the potential for releases to the environment, especially storm water.
2.0 STORMWATER MANAGEMENT CONTROLS
2.1. Controls Overview
During construction, several controls and measures shall be implemented under the
direction of the General Contractor to prevent offsite discharge of contaminated
storm water. Controls for this project include erosion, sedimentation, stabilization,
and other BMPs. Specifications and engineering drawings for the selected BMPs can
be found on the drawing included in the back pocket of this.
The contractor shall comply with the attached plans and guidelines as a minimum.
Field conditions and unforeseen circumstances will dictate modifications to or
additions to this Stormwater Management Plan. Where storm water pollution
potential exists, appropriate preventative measures (BMPs) must be utilized and
documented, whether such measures are identified in this report or not.
2.2. Erosion and Sediment Controls
The objective of erosion control is to limit the amount of erosion occurring on
disturbed areas until the site is stabilized. The objective of sediment control is to
capture the soil that has been eroded before it leaves the construction site. Despite
the use of both erosion and sediment control measures, it is recognized that some
sediment could remain in runoff leaving the construction site. This should be
minimized to the maximum extent practicable.
The BMPs scheduled for use during the construction of this site can be divided into
Structural and Non-Structural Practices. Section 2.2.1 of this report discusses the
proposed structural BMPs to be utilized. Section 2.2.2 discusses the non-structural
practices.
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2.2.1.Structural Practices (See drawings for locations)
Structural BMPs are structural site management practices that will minimize erosion
and sediment transport. Such practices may include straw bales, silt fences,
drainage swales, inlet protections, outlet protection, etc. The goal of structural
BMPs on this project is to protect areas downstream of the site from turbid water,
sediment, oils and other contaminants, which may mobilize during storm water
flows. The structural BMPs that may be utilized on the subject site are depicted in
the Drainage and Erosion Control Plan and are described in more detail as follows:
Silt Fence:
A temporary vertical barrier of filter fabric attached to and supported by
posts and entrenched into the ground.
Utilized to intercept sediment from disturbed areas during construction
operations.
Used to filter shallow sheet flow.
Typically used along the toe of fills, in transition areas between cut and fills,
and adjacent to streams.
Generally installed prior to or immediately following land-disturbance
activity.
Shall be inspected periodically and after each rain or snowfall event and
repaired when necessary. Sediment shall be removed from behind the fence
when it accumulates to one-half the exposed fabric height. Sediments
removed must be properly disposed.
Utilized as a temporary feature.
Inlet Protection:
A barrier across or around a storm drain drop inlet, a curb inlet, or a culvert
inlet.
Utilized to intercept and filter sediment-laden runoff and prevent it from
entering storm drainage systems.
Not to be utilized in place of a sediment-trapping device. Used as a
secondary control device.
Do not use where ponded water might flow onto the roadway.
Blocking of the inlet should not be watertight.
Generally installed prior to land-disturbance activity on existing inlets and
immediately after the construction of new inlets.
Shall be inspected periodically and after each rain or snowfall event and
repaired when necessary. Accumulated sediment shall be removed and
properly disposed.
Utilized as a temporary feature.
Grading Techniques:
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Soil surface roughening, terracing and rounding at tops of cuts, transitions
and roadway ditches to facilitate plant establishment and minimize erosion.
Utilized to temporarily stabilize disturbed areas and protect from wind and
water erosion immediately after grading activities have ceased.
Used as a temporary practice during construction.
Inspection and maintenance must be provided periodically and after each
rain or snowfall event that causes runoff to ensure roughened state is
maintained.
Rills developed should be filled and the area re-graded immediately.
Erosion control measures are the responsibility of the General Contractor to inspect
and maintain. Any existing erosion control devices that are removed in order to
complete the construction of the utilities shall be replaced immediately following
the construction that required its removal unless directed otherwise by the
construction plans.
2.2.2.Non-Structural Practices (See drawings for locations)
Non-Structural BMPs are both interim and permanent stabilization practices. Such
practices may include temporary seeding, permanent seeding, mulching, geotextiles,
sod stabilization, vegetative buffer strips, tree protection, preservation of mature
vegetation, etc. The non-structural BMPs that may be utilized on the subject site are
described in more detail as follows:
Temporary and Permanent Seeding:
Soil preparation, seeding, mulch tackifier and/or mulching shall be required
for all disturbed areas that are not surfaced.
Exposed soils, which are not part of the active grading and/or construction
activity, shall be stabilized.
Seeded areas shall be inspected frequently. If the seeded areas fail to
establish, provide adequate ground coverage. If seeded areas are disturbed,
the area should be re-seeded.
Permanent landscaping and vegetative cover is depicted on the Landscaping
plans.
Mulching:
Application of plant residues to the soil surface. Typical mulching material
includes certified weed free hay or straw, certified under the Colorado
Department of Agriculture Weed Free Forage Certification Program as
regulated by the Weed Free Forage Act, Title 35, Article 27.5, CRS and wood
cellulose fiber.
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Utilized in combination with mulch tackifier for temporary erosion control
(i.e., incomplete slopes, detour slopes, stockpiles).
Utilized in combination with mulch tackifier for temporary erosion control on
slopes when seeding is not allowed due to seasonal constraints.
Used to cover permanent or temporary seed areas. Hydromulch shall not be
done in the presence of free surface water.
Inspect frequently and reapply mulching in areas where the mulching has
been loosened or removed. Mulch tackifier must be applied with additional
applications of mulching.
Mulch Tackifier:
An organic soluble powder adhesive used as a water slurry to adhere native
hay, straw, hydromulch, or seed to a surface and together.
Used to cover disturbances as temporary cover for wind erosion.
Mulch movement indicates poor application and procedure mixture.
Proper application will bond mulch material together and to soil.
Inspect by touching mulch surface to determine if adhesion has occurred.
Maintain Existing Vegetation:
Existing vegetation should be preserved where possible to prevent the
migration of sediment.
Should be inspected regularly.
Establish and maintain buffers.
Areas beginning to show signs of erosion or soil transport may require
additional emergency BMPs.
2.2.3.Other Controls (See drawings for location)
Vehicle Tracking Control / Construction Entrance:
A temporary stabilized layer of aggregate underlined with geotextile or
gravel located where traffic enters or exits the construction site.
The structure shall be constructed prior to any construction activity and
maintained daily.
Stone shall be added and repairs performed as conditions require.
When mud is present and not easily removed by a tracking pad, tire washing
should be implemented as needed. Tire washing operations should occur
near the construction exit on a stabilized stone pad. Implementation of a tire
washing area should include provisions for collecting wash water and
directing it to an onsite pond.
Tracking of Sediment onto Roads, Streets and Parking Lots:
Public and private roadways and parking shall be kept clear of accumulated
sediment. Bulk clearing of accumulated sediment shall not include flushing
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the area with water. Sediment will be shoveled and or swept from the street
and disposed of in a manner that prevents contamination of storm water or
surface water runoff.
2.3. SWMP Administrator
Implementation and management of the environmental aspects of this project
under this SWMP Plan are the responsibilities of the General Contractor. The
General Contractor shall ensure the all contractors providing services on the project
have access to a copy of the SWMP Plan and appropriate training regarding storm
water pollution prevention. The General Contractor, Building Contractor, Utility
Installations Contractor, Grading Contractor and all other contractors and
subcontractors shall be familiar with the SWMP Plan and their responsibilities on the
plan.
2.4. Materials Management
2.4.1.Potential Pollution Sources
It is anticipated that this construction project will not utilize any abnormal or
atypical hazardous materials. The construction site will operate much like other
typical construction projects. The following materials or substances are expected to
be present onsite during construction:
Concrete/Additives/Wastes Cleaning solvents
Detergents Petroleum based products
Paints/Solvents Pesticides
Acids Fertilizers
Solid and construction wastes Sanitary wastes
Soil stabilization additives
Activities on the site that may have an impact on stormwater include the following:
Equipment and/or vehicle washing
Fertilizers, chemicals, or other material storage
Vehicle maintenance or fueling
Waste incineration, treatment, storage or disposal
Off-site vehicle tracking
Loading/unloading areas
Concrete truck washout
As construction progresses, specific areas shall be designated for vehicle
maintenance and refueling, material and waste storage, construction equipment
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staging, and bathroom facilities. Management measures and procedures for these
facilities are discussed later in the plan.
2.4.2.Pollution Prevention Measures
Pollution prevention measures shall be utilized to prevent construction materials
with the potential of polluting stormwater, such as those listed above, from coming
in contact with runoff. Measures include good housekeeping and proper disposal of
construction and demolition debris, equipment fuel, lubricants, paints and solvents,
asphalt, concrete, topsoil and other materials, as well as controls which prevent
sediments from being tracked off-site by construction vehicles, and proper control
of any non-stormwater flows on-site.
As previously stated, Best Management Practices (BMPs) are schedules of activities,
prohibitions of practices, maintenance procedures, and other management practices
to prevent or reduce pollution of public waters. BMPs also control site runoff,
spillage or leaks, sludge or waste disposal, or drainage from raw material storage.
With regard to construction, these may include structural controls and nonstructural
practices that are designed to prevent pollutants from entering water or direct the
flow of water away from potential sources of pollution.
For construction sites, there are three main types of BMPs, those that prevent
erosion and sediment transport, others that prevent pollutants from construction
materials from mixing with stormwater, and those that trap pollutants before they
can be discharged. BMPs for most common construction materials and wastes with
the greatest potential for adversely affecting stormwater quality are as follows:
BMPs for Disturbed and Stored Soils:
Seeding and mulching should be completed for the site
Soil preparation, seeding, mulch tackifier and/or mulching shall be required
for all disturbed areas that are not surfaced.
Exposed soils, which are not part of the active grading and/or construction
activity, shall be stabilized.
Seeded areas shall be inspected frequently. If the seeded areas fail to
establish, provide adequate ground coverage. If seeded areas are disturbed,
the area should be re-seeded.
Permanent landscaping and vegetative cover is depicted on the Landscaping
plans.
BMPs for Vehicle Tracking of Sediment:
Use vehicle tracking pads at the entrances of construction
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Public and private roadways shall be kept clear of accumulated sediment.
Bulk clearing of accumulated sediment shall not include flushing the area
with water. Sediment will be shoveled and or swept from the street and
disposed of in a manner that prevents contamination of storm water or
surface water runoff.
A temporary stabilized layer of aggregate underlined with geotextile or
gravel located where traffic enters or exits the construction site.
The structure shall be constructed prior to any construction activity and
maintained daily.
Stone shall be added and repairs performed as conditions require.
When mud is present and not easily removed by a tracking pad, tire washing
should be implemented as needed. Tire washing operations should occur
near the construction exit on a stabilized stone pad. Implementation of a tire
washing area should include provisions for collecting wash water and
directing it to an onsite pond
BMPs for Management of Contaminated Soils:
Have equipment to contain and clean up spills of hazardous materials in the
vicinity of where these materials are to be stored or used.
Contain and clean up spills immediately after they occur. Contact State or
Local solid waste regulatory agency concerning information and procedures
necessary to treat or dispose of contaminated soils.
Keep materials in a dry covered area and elevated from the ground.
BMPs for Loading and Unloading Operations:
Select a loading and unloading area for the site
BMPs for Outdoor Storage Activities:
Select an outdoor storage area for the site
When possible store equipment and material in covered areas
BMPs for Equipment Maintenance and Fueling:
Fueling operations shall occur in a designated area.
Have equipment to contain and clean up petroleum spills in fuel storage
areas or on board maintenance and fueling vehicles.
Where possible, store petroleum products and fuel vehicles in covered areas
and construct dikes to contain spills.
Contain and clean up spills immediately.
Use preventive maintenance for onsite equipment such as checking for and
fixing gas and oil leaks in construction vehicles on a regular basis.
Follow proper procedure for the handling and application of asphaltic
substances.
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Oversee all filling operations.
Fueling equipment and area shall be fenced and valving locked to prevent
vandalism.
BMPs for Significant Particulate Generating:
Use silt fence and inlet protection to protect the areas downstream of the
site
Maintain and clean out any sediment that builds up around the inlet
protection and silt fence
BMPs for On-Site Waste Management:
Select a designated waste collection area onsite.
Provide an adequate number of containers with lids or covers that can be
placed over the containers prior to rainfall.
When possible, locate containers in a covered area.
Arrange for waste collection before containers overflow.
If a container does spill, provide cleanup immediately.
Plan for additional containers and more frequent pickups during the
demolition phase of construction.
Make sure that construction waste is collected, removed, and disposed of
only at authorized disposal areas.
Check with local solid waste management agency for specific guidance.
Trash, debris and spoils shall be properly contained at the END of EACH day.
BMPs for residual Concrete disposal:
Emptying or wash out of excess concrete may be allowed on site. Excess
concrete and wash water should be disposed of in a manner that prevents
contact between these materials and stormwater discharges from the site.
Residual concrete shall be discharged in specifically designated dike areas,
which have been prepared to prevent contact between the concrete and/or
washout and stormwater discharged from the site and/or ground water.
The hardened residue from the dike areas shall be disposed of in the same
manner as other non-hazardous construction waste materials or may be
broke up and utilized as deemed appropriate by the contractor.
The use of the washout area shall be temporary (less than one year).
Washing of trucks and masonry equipment is to be performed only at a
designated concrete washout. No burying of wastes.
BMPs for Sanitary/Septic Wastes:
Sanitary or septic wastes that are generated onsite should be treated or
disposed of in accordance with State or local requirements.
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If self-contained, temporary facilities are utilized, the domestic waste haulers
should be contracted to regularly remove the sanitary and septic wastes and
to maintain the facilities in good working order.
Any facilities to be connected to a sanitary sewer system should be properly
hooked to the sanitary sewer system to prevent illicit discharges.
Untreated, raw sewage should never be discharged or buried onsite.
Contact local government and State regulatory agencies to ensure the
compliance with State or local requirements.
If sewage is being discharged to the sanitary sewer, the local treatment
works authority should be contacted.
BMPs for pesticides:
Store pesticides in a dry covered area and elevate above the ground.
Provide curbs or dikes to contain possible spills.
Have measures on site to contain and clean up spills.
Strictly follow recommended application rates and recommended application
methods.
Only a Certified Applicator shall use pesticides.
BMPs for Fertilizers/Detergents:
Limit the application of fertilizers to the minimum area and minimum
recommended amounts.
Reduce exposure of nutrients to storm water runoff by working the fertilizer
deep into the soil.
Apply fertilizer more frequently, but at lower application rates.
Hydro seeding, where lime and fertilizers are applied to the ground surface in
one application should be limited, where possible.
Limit the use of detergents onsite: wash water containing detergents should
not be discharged to the storm system.
Implement good erosion and sediment control to help reduce the amount of
fertilizers that can leave the site as well as sediments.
Fertilizers and detergents shall be stored in dry and covered area and
elevated above the ground.
Berming shall be provided around the storage area to avoid contact with
stormwater runoff.
BMPs for Hazardous Wastes Disposal:
Check with local waste management authorities to determine what the
requirements are for disposing of hazardous materials.
Use the entire product before disposing of the container.
Do not remove the original product label from the container. It contains
important information.
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Do not mix products together unless specifically recommended by the
manufacturer.
The correct disposal of these products varies with the product utilized.
Follow the manufacturers recommended method, which is often found on
the label.
2.5. Spill Management
Construction site supervisors should create and adopt a spill control plan that
includes measures and procedures to stop the source of the spill, contain the spill,
clean up, and disposal of contaminated materials. Key personnel shall be identified
and trained to be responsible for spill prevention and control. The following
measures would be appropriate for a spill prevention and response plan:
Store and handle materials to prevent spills.
o Tightly seal containers.
o Make sure all containers are clearly labeled.
o Stack containers neatly and securely
o Where possible, store containers on pallets in a covered area.
Reduce stormwater contact if there is a spill.
o Have cleanup procedures clearly posted.
o Have cleanup materials readily available.
o Contain any liquid.
o Stop the source of the spill.
o Cover spill with absorbent material.
Dispose of contaminated materials according to manufacturer’s instructions
or according to State or local requirements.
Identify personnel responsible for responding to a spill of toxic or hazardous
materials.
o Provide personnel spill response training.
o Post names of spill response personnel.
Keep the spill area well ventilated.
Additionally, records of spills, leaks, or overflows that result in the discharge of
pollutants must be documented and maintained. Information such as the time and
date, weather conditions, response procedure taken, response personnel involved,
reasons for the spill, etc., shall be recorded for all occurrences in the SWMP Plan and
on the map.
Spill Categories are as follows:
Minor Spills
Any event that involves 5 gallons or more and or involves the following:
Less than the reportable quantity
Stays within the permitted area
Does not threaten any stormwater conveyances
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Significant Spills
Reportable Quantity (SARA title III List of Lists, available from EPA for
reportable quantity)
Any amount leaving the permitted area
And/or threatens any water conveyances.
Hazardous Spills
Any substance requiring a MSDS response.
Procedure shall include but limited to:
o Secure the area
o Provide first aid
o Notify emergency response personnel
Some spills may need to be reported to the Division of Water Quality and the City of
Fort Collins immediately. Specifically significant spills that are, 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), any spill that exceeds the reportable quantity, and
any amount that leaves the permitted area must be reported. The Division’s toll-
free 24-hour environmental emergency spill reporting line is 1-877-518-5608.
Written documentation to both the CDPHE (Division) and the City of Fort Collins of
significant spills should be provided within 5 days.
3.0 Dry Land Vegetation
3.1. Soil and Surface Conditions
The Bachus & Schanker Law Office site consists of primarily Satanta loam. Satanta
loam belongs to hydraulic soil Group B. Soils having a moderate infiltration rate
when thoroughly wet. These consist chiefly of moderately deep or deep, moderately
well drained or well drained soils that have moderately fine texture to moderately
coarse texture. These soils have a moderate rate of water transmission.
3.2. Seed Mixes
A standard City of Fort Collins seed mix should be used for the site. If a standard mix
is not used than a request to the City must be submitted of the preferred seed mix
with the application rates.
3.3. Mulches
Typical mulching material includes certified weed free hay or straw, certified under
the Colorado Department of Agriculture Weed Free Forage Certification Program as
regulated by the Weed Free Forage Act, Title 35, Article 27.5, CRS and wood
Guardian Storage Fort Collins
Stormwater Management Plan
cellulose fiber. Mulch should be utilized in combination with mulch tackifier for
temporary erosion control (i.e., incomplete slopes, detour slopes, stockpiles) when
seeding is not allowed due to seasonal constraints. Mulch is also used to cover
permanent or temporary seed areas. The mulch should be inspected frequently and
reapplied in areas where the mulch has been loosened or removed. Mulch tackifier
must be applied with additional applications of mulching.
4.0 Detailed Sequence of Construction Activities
Sequence of Land Disturbing Activity Chart
Mobilization Demolition Grading
Utilities
Installation
Flat work
Installation
Vertical
Installation Landscape Demobilization
Best Management
Practices (BMPs)
Structural "Installation"
Silt Fence Barriers*
Vehicle Tracking Pad*
Inlet Filter Bags*
Any prior inlets that could use
protecting
Rock Bags*
Any prior inlets that could use
protecting
Rip Rap
Collecting Asphalt /
Concrete Saw Cutting
Waste
*All BMPs to be Removed once Construction is Complete.
Vegetative
Temporary Seeding
Planting Any time the site will sit dorment longer than 30 Days.
Mulching/Sealant Any time the site will sit dorment longer than 30 Days.
Permanent Seeding
Planting
Sod Installation
Rolled Products :
Netting/Blankets/Mats
Any time the site will sit dorment longer than 30 Days.
5.0 Inspection and Maintenance
5.1. Inspection and Maintenance Overview
Guardian Storage Fort Collins
Stormwater Management Plan
A site inspection of all erosion control facilities shall be conducted at least once
every two weeks and immediately following any significant precipitation or
snowmelt event that could cause surface erosion and every 30 days for inactive
construction projects. The inspection must determine if there is evidence of, or the
potential for, pollutants entering the drainage system, and BMPs should be
reviewed to determine if they still meet the design and operational criteria in the
SWMP Plan and that they continue to adequately control pollutants at the site. The
construction site perimeter, disturbed areas, discharge points and areas used for
material storage that are exposed to precipitation shall be inspected for evidence of,
or the potential for, pollutants entering the storm drainage system. Erosion and
sediment control measures identified in this SWPM Plan and on the construction
plans shall be observed to ensure that they are operating correctly. Any other
structural BMPs that may require maintenance, such as secondary containment
around fuel tanks or the conditions of spill response kits shall also be inspected.
Stormwater items to be inspected include the following:
Condition & failures of structural & non-structural BMPSs
Perimeter and outfall structure
Evidence of spills, upsets & discharges
Maintaining accurate SWMP Plan documentation
Material Handling and storage
Good Housekeeping
Site Stabilization
Meet authorities during inspections
Update permit disturbed acreage
Equipment and vehicle storage area
Maintenance records of equipment, systems & operations
The project site and the adjacent streets and parking areas impacted by the
construction shall be kept neat, clean and free of debris. The control measures and
facilities need to be maintained in good working order. Any items that are not
functioning properly or are inadequate should be promptly repaired or upgraded.
The site shall be inspected by responsible personnel who are familiar with the site.
Inspection and monitoring will follow the procedures outlined below:
Minimum Monitoring (Inspection) Requirements:
Inspections of the construction site shall be conducted by the contractor (or
agent) every two weeks and after significant storm events.
The qualified site superintendent familiar with this SWMP Plan /BMP shall
perform the inspections.
The contractor shall certify the site is in compliance with the SWMP Plan
/BMP and the permit by:
Guardian Storage Fort Collins
Stormwater Management Plan
o Ensuring that areas contributing significant storm water discharges
related to the construction activities have been identified.
o Evaluating preventive measures required by the SWMP Plan /BMP to
insure they are adequate and has been properly implemented.
o Points of discharge from the site will be inspected to check for signs
of pollutant discharge.
o Certifying the grade elevations and capacity of permanent
sedimentation facilities.
o Determining if additional control measures will need to be
implemented.
o Updating this SWMP Plan if new measures are implemented or
existing controls are deleted.
Based on the results of the inspection, the description of potential pollutant sources,
and the pollution prevention and control measures that are identified within this
plan shall be revised and modified as appropriate and as soon as practicable after
such inspection. Typically corrective action shall commence immediately when a
deficiency is observed.
In addition to the inspections performed at least every 7 days, several daily
inspections will be required. Each day when any type of construction activity has
taken place onsite, qualified personnel provided by the General Contractor shall:
Inspect all onsite areas where petroleum products are stored, used or
handled for spills and leaks from vehicles and equipment.
Inspect all onsite locations where vehicle enter or exit the site for evidence of
offsite sediment tracking.
5.2. Final stabilization and long term stormwater management
Permanent stabilization will be achieved by establishing a vegetative cover on all
disturbed areas. The vegetative cover will be as specified on the Landscape Plan.
Final stabilization shall be considered complete when all paving and landscaping are
completed and the vegetative cover has been established with a density of at least
70 percent of pre-disturbance levels (including shrubs and trees).
In general spring and fall encouraged whenever possible. Temporary and
permanent seeding shall be completed within 14 days after grading has ceased and
left to idle for more than 30 days. Care should be taken to complete seeding
activities prior to November 1st for disturbed land intending to remain inactive for
the winter months.
Roughening and scarifying disturbed areas is allowed as a temporary stabilization
with the following conditions:
Guardian Storage Fort Collins
Stormwater Management Plan
During winter activity
Intended to seeded in the spring fall seasons
Intended to be active within 2-3 months of inactivity (with Stormwater
approval)
Management of storm water after completion of construction will be accomplished
by utilizing the practices listed below:
Upon completion of construction, the site shall be inspected to ensure that
all equipment, waste materials, and debris have been removed.
The site will be inspected to make certain that all graded surfaces have been
landscaped or seeded with an appropriate ground cover.
Upon acceptance of final stabilization measures, all temporary BMP's shall be
removed and proper function of inlets, drainage ways, or other storm water
conveyance elements shall be restored.
The storm sewer systems and the detention pond will be returned to full
capacity and the outlet structures will be checked to assure they are
unclogged and in working order.
The General Contractor shall be responsible for maintaining the storm water
controls in good working order including removal measures until the Inactivation
Notice is filed with the State. The state requires the Inactivation Notice be filed
within 3 months of the proposed end of construction. Alternatively, permit
responsibilities may be transferred or reassigned by submitting a Notice of Transfer
and Acceptance of Terms or a Reassignment of Coverage if control of a portion of
the site changes parties.
6.0 CONCLUSION
This Stormwater Management Plan has been prepared in accordance with the
criteria and methods described in the “State of Colorado General Permit Application
and Stormwater Management Plan Guidance for Stormwater Discharges Associated
with Construction Activity.” The drainage system has been designed to comply with
the regulatory requirements of the City of Fort Collins Stormwater Criteria Manual.
All temporary and permanent erosion and sediment control BMPs shall be
inspected, maintained and repaired by the General Contractor as needed to ensure
continued performance of their intended function.
The General Contractor shall remove all temporary erosion and sediment control
BMPs after stabilization is achieved or after temporary BMPs are no longer needed.
Trapped sediment will be removed by the General Contractor or stabilized onsite.
Disturbed soil areas resulting from removal of BMPs or the General Contractor will
permanently stabilize vegetation as soon as possible.
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Stormwater Management Plan
7.0 REFERENCES
1.“Hydrologic Group Rating for Larimer County Area, Colorado”, USDA-Natural
Resources Conservation Service, National Cooperative Soil Survey. Web Soil
Survey URL: http://websoilsurvey.nrcs.usda.gov.
2.Fort Collins Stormwater Criteria Manual, City of Fort Collins Storm Water
Utility, City of Fort Collins, Colorado, Updated December, 2018.
3.Urban Storm Drainage Criteria Manual (Volumes 1, 2, and 3), Urban Drainage
and Flood Control District, (Rev. January 2016)
Guardian Storage Fort Collins
Stormwater Management Plan
APPENDIX A
Figures
A Westrian Company
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0806 9C1000F12/19/2006Not Printed
AREA OF MINIMAL FLOOD HAZARD Zone X
T6N R69W S1
LARIMER COUNTY080101
CITY OF FORT COLLINS080102
LARIMER COUNTY080101
USGS The National Map: Orthoimagery. Data refreshed April, 2019.
National Flood Hazard Layer FIRMette
0 500 1,000 1,500 2,000250Feet
Ü105°4'50.47"W 40°31'6.68"N 105°4'13.02"W 40°30'39.33"N
SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT
SPECIAL FLOODHAZARD AR EAS
Without Base Flood Elevation (BFE)Zone A, V, A99With BFE or Depth Zone AE, AO, AH, VE, AR
Regulator y Floodway
0.2% Annual Chance Flood Hazard, Areasof 1% annual chance flood with averagedepth less than one foot or with drainageareas of less than one square mile Zone X
Future Conditions 1% AnnualChance Flood Hazard Zone XArea with Reduced Flood Risk due toLevee. See Notes.Zone X
Area with Flood Risk due to Levee Zone D
NO SCREE N Area of Minimal Flood Hazard Zone X
Area of Undetermined Flood Hazard Zone D
Channel, Culver t, or Storm SewerLevee, Dike, or Floodwall
Cross Sections with 1% Annual Chance17.5 Water Surface ElevationCoastal Transect
Coastal Transect BaselineProfile BaselineHydrographic Feature
Base Flood Elevation Line (BFE)
Effective LOMRs
Limit of StudyJurisdiction Boundar y
Digital Data Available
No Digital Data Available
Unmapped
This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards
The flood hazard information is derived directly from theauthoritative NFHL web ser vices provided by FEMA. This mapwas exported on 11/8/2019 at 5:35:39 PM and does notreflect changes or amendments subsequent to this date andtime. The NFHL and effective information may change orbecome superseded by new data over time.
This map image is void if the one or more of the following mapelements do not appear: basemap imagery, flood zone labels,legend, scale bar, map creation date, community identifiers,FIRM panel number, and FIRM effective date. Map images forunmapped and unmodernized areas cannot be used forregulatory purposes.
Legend
OTHER AREAS OFFLOOD HAZARD
OTHER AREAS
GENERALSTRUCTURES
OTHERFEATURES
MAP PANELS
8
1:6,000
B 20.2
The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative proper ty location.
9,028
1,504.7
FC Maps - Guardian Self Storage
This map is a user generated static output from the City of Fort Collins FCMaps
Internet mapping site and is for reference only. Data layers that appear on this
map may or may not be accurate, current, or otherwise reliable.
6,859
City of Fort Collins - GIS
1,143.0
Legend
1:
WGS_1984_Web_Mercator_Auxiliary_Sphere
Feet01,143.0571.50 Notes
FEMA Floodplain
FEMA High Risk - Floodway
FEMA High Risk - 100 Year
FEMA Moderate Risk - 100 / 500 Year
City Floodplains
City High Risk - Floodway
City High Risk - 100 Year
City Moderate Risk - 100 Year
City Limits
Project:Disturbed Acres:3.50
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
LF 1625 $2.50 $4,062.50
EA 26 $50.00 $1,300.00
EA 31 $250.00 $7,750.00
EA 1 $100.00 $100.00
SY 16 $3.00 $48.00
SY 382 $2.00 $764.00
EA 1 $1,000.00 $1,000.00
Sub-Total:$15,024.50
1.5 x Sub-Total:$22,536.75
Amount of security:$22,536.75
Total Acres x Price/acre:$8,750.00
$2,500.00 Sub-Total:$8,750.00
1.5 x Sub-Total:$13,125.00
Amount to Re-seed:$13,125.00
Minimum escrow amount:$3,000.00
Erosion Control Escrow:$22,536.75
Miniumum Escrow Amount
Guardian Storage
Unit Price of Seeding per acre:
“The amount of the security must be based on one and one-half times the estimate of the cost to install the approved measures, or one and one-half times the
cost to re-vegetate the disturbed land to dry land grasses based upon unit cost determined by the City's Annual Revegetation and Stabilization Bid, whichever
is greater. In no instance, will the amount of security be less than one thousand five hundred dollars ($1,500) for residential development or three thousand
dollars ($3,000) for commercial development”
Inlet/ Outlet Protection (IP or OP)
Concrete Washout (CWA)
(add all other BMPs for the site in this list)
Final Escrow Amount
Erosion Control Blanket (ECB)
Erosion and Sediment Control Escrow/Security Calculation
for The City of Fort Collins
BMP Amount
Silt Fence (SF)
Vehicle Tracking Control (VTC)
Reseeding Amount - N/A
Gravel Bag Curb Check/ Sediment Control
Log (SCL)
Stabilize Staging Area (SSA)
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Guardian Storage Fort Collins
Stormwater Management Plan
APPENDIX B
Erosion Control Plan
A Westrian Company29,825 GSF
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