HomeMy WebLinkAboutFORT COLLINS MONTESSORI SCHOOL - FDP200002 - DOCUMENT MARKUPS - ROUND 2 - STORMWATER MANAGEMENT PLANPrepared For:
Hauser Architects, P.C.
3780 East 15th Street, Suite 201
Loveland, CO 80538
970-669-8220
Prepared By:
Coffey Engineering & Surveying, LLC
4045 St. Cloud Drive, Suite 180
Loveland, CO 80538
970-622-2095
Contractor/SWMP Administrator:
Elder Construction Inc.
7380 Greendale Road
Windsor, CO 80550
970-744-4731
Owner:
Fort Collins Montessori School
Project No. 2259.03
December 17, 2019
STORMWATER MANAGEMENT PLAN
FORT COLLINS MONTESSORI SCHOOL
1109 W HARMONY
FORT COLLINS, CO 80526
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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I. Table of Contents
I. Table of Contents ................................................................................................... 2
II. Introduction .................................................................................................... 1
1.1 Stormwater Quality Statement ............................................................................... 1
1.2 SWMP Objective ...................................................................................................... 1
1.3 Location .................................................................................................................... 1
1.4 Project Description .................................................................................................. 2
III. Site Description ............................................................................................... 2
2.1 Construction Activity Description .......................................................................... 2
2.2 Proposed Sequence for Major Activities................................................................ 2
2.3 Area Estimates ......................................................................................................... 3
2.4 Runoff Coefficient and Soil Description ................................................................ 3
2.5 Existing Vegetation .................................................................................................. 3
2.6 Location and Description of Other Potential Pollution Sources ......................... 3
2.7 Non-Stormwater Components of Discharge .......................................................... 4
2.8 Receiving Waters ..................................................................................................... 4
IV. BMPs for Stormwater Pollution Prevention ................................................ 4
3.1 Erosion and Sediment Controls .............................................................................. 4
3.2 Erosion Control Sequencing ................................................................................... 6
3.3 Materials Handling and Spill Prevention .............................................................. 7
V. Potential pollutant sources............................................................................. 8
VI. Final Stabilization and Long-term Stormwater Quality ..........................10
VII. Inspection and Maintenance Procedures ...................................................11
VIII. References ......................................................................................................12
IX. APPENDIX A ................................................................................................13
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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II. INTRODUCTION
1.1 Stormwater Quality Statement
Stormwater quality best management practices shall be implemented to minimize soil
erosion, sedimentation, increased pollutant loads and changed water flow characteristics
resulting from land disturbing activity, to the maximum extent practicable, so as to
minimize pollution of receiving waters.
1.2 SWMP Objective
The objective of this Stormwater Management Plan (SWMP) for Fort Collins Montessori,
is to identify the Best Management Practices (BMP’s) which, when implemented, will
meet the requirements of the City of Fort Collins SWMP Standards. The SWMP goal is
to, “Identify possible pollutant sources that may contribute pollutants to stormwater, and
identify BMP’s that, when implemented, will reduce or eliminate any possible water
quality impacts. The SWMP must be completed and implemented at the time the project
breaks ground, and revised if necessary, as construction proceeds to accurately reflect the
conditions and practices at the site.”
The SWMP is a “living” document which should be modified and updated through the
course of site construction. Pollutant sources should be continuously evaluated, BMP’s
selected, documented, implemented, and pollutant sources be re-evaluated (and the
process continued). A current copy of the SWMP shall be kept onsite at all times. A
person familiar with the SWMP and on-site construction activities and clean-up
procedures should be designated as the SWMP Administrator for the site. The SWMP
Administrator will be responsible for (but not limited to) inspections and inspection
reports, personnel training, regulatory agency contact, SWMP implementation and
revisions, field notebooks, and record keeping of employee activities, contacts, and
notifications.
References are found in the Appendix regarding some of the requirements, restrictions,
and forms related to the SWMP.
1.3 Location
The proposed site is located in the northeast quarter (NE ¼) of Section 3, Township 6
North, Range 69 West of the 6th P.M., City of Fort Collins, County of Larimer, State of
Colorado and can legally be described as Lot 1 Montessori Subdivision. The site’s parcel
number is 960310008 and has GPS coordinates of 40.522890, -105.097053.
Specifically, the property is located southwest of the intersection of West Harmony Road
and South Shields Street. The property address is 1109 West Harmony Road, Fort
Collins, Colorado, 80526. (Please see the vicinity map located in the Appendix A).
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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1.4 Project Description
The site is 4.29 acres currently zoned as low-density mixed-use neighborhood district
(LMN). The existing site consists of a residence, detached garage, various outbuildings,
gravel access drive and native vegetation. The site is bound by Harmony Road to the
north, Shields Street to the east, and residential lots to the south and west.
The existing site is comprised of two sub-basins. The northern portion of the site,
approximately 2.17 acres, drains to the northeast corner of the site at a slope of
approximately 3 percent to an existing 3’x3’ area inlet. The southern portion of the site,
approximately 2.12 acres, sheet flows to the south onto the adjacent property.
According to the NRCS soils map survey, the native soils consist of Altvan-Satanta
Loams (a United States Department of Agriculture Type “B” hydrologic soil). These
soils have a moderate rate of water transmission. This soil has a K value of 0.28. The
higher the K value the more susceptible to erosion. K values range from 0.02 to 0.69.
There are no active irrigation facilities located within the proposed site area.
The development of the site will occur in two phases. This SWMP will address the
improvements for only phase I. The development of phase I consists of the construction
of a 14,700-sf Montessori school, two temporary modular buildings, concrete sidewalks,
playground area, right turn lane off Shields Street and landscaping improvements.
Parking will be provided to the north of the proposed building on an asphalt parking lot
with concrete curb and gutter allowing for site drainage. The site will utilize four on-site
detention ponds connected by equalizer pipes. The detention ponds were designed to
accommodate developed flows from both phases of development.
III. SITE DESCRIPTION
2.1 Construction Activity Description
Construction activity includes installation of BMP’s, grading, utility construction, and
building and parking lot construction.
2.2 Proposed Sequence for Major Activities
The sequence for major construction activities includes the installation of BMP’s, overlot
grading including drainage conveyance construction, installation of utilities, building
construction, final grading and landscaping.
Construction is expected to occur in one phase. Construction is estimated to begin
January 2020 and be completed in June 2020.
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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2.3 Area Estimates
The entire site area, 4.29 acres will be disturbed and will be referred to as the, “Limit of
disturbance.” The staging & storage area will be approximately 10,000 square feet. The
approximate cut/fill number is 8,000 cubic yards of cut.
2.4 Runoff Coefficient and Soil Description
According to the NRCS Web Soil Survey maps, the majority of the site consists of:
Name
Soil
Type
Erosion
Altvan-Satanta Loams, 0 to 3 Percent Slope B Moderate
2.5 Existing Vegetation
The site consists of approximately 90% native vegetation ground cover with mature trees
scattered around the site. The remaining portion of the site consists of an existing
residence, various out buildings, and a gravel driveway.
2.6 Location and Description of Other Potential Pollution Sources
Potential pollutant sources include water and wind born sediment, uncovered soil,
concrete washouts, building materials, and fertilizers. Reference the Erosion Control Plan
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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in the Appendix for the location of the staging area. The staging/stockpile area(s) may be
moved to a location no closer than 100’ from a stormwater conveyance.
2.7 Non-Stormwater Components of Discharge
Site disturbance will not exceed five feet below the existing grade, therefore having no
impact on the groundwater at lower depths.
2.8 Receiving Waters
The proposed site is located within the Mail Creek Basin, located in southwest Fort
Collins. The basin has a drainage area of approximately 1676 acres and is primarily
located between Taft Hill Road and Lemay Avenue between Horsetooth Road and County
Road 36. The basin generally drains from west to east to the confluence of Mail Creek and
Fossil Creek, and ultimately to Fossil Creek Reservoir. Fossil Creek is approximately 4.25
miles from the proposed site.
IV. BMPS FOR STORMWATER POLLUTION PREVENTION
3.1 Erosion and Sediment Controls
In order for construction activities to begin, Best Management Practices (BMP’s)
intended to contain sediment onsite must be constructed, inspected and repaired as
necessary. Such controls must be functional before upslope land disturbance takes place.
The BMP’s will be installed as shown on the enclosed Erosion Control Plan. They must
be supplemented as on-site experience proves necessary in order to control sediment,
pollutant discharge, and ensure public safety. The following temporary and permanent
BMP’s will be installed and maintained to control on-site erosion and prevent sediment
from traveling off-site during construction:
Temporary BMP’s
• Temporary Seeding is the establishment of a temporary vegetative cover on a
graded area that will be exposed for longer 30 days. Temporary seeding can be used
on areas requiring temporary protection that will eventually need permanent
vegetation at the completion of the construction or it can be used for areas that will be
re-disturbed after a period of inactivity.
• Vehicle Tracking Control (shown as VTC on the Erosion Control Plan) is a
stabilized stone pad located at points of ingress and egress on a construction site and
acts as a temporary BMP. The stone pad is designed to reduce the amount of mud
transported onto public roads by construction traffic by removing mud and sediment
from the vehicle’s wheels when it drives over the gravel pad. These areas are limited
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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to the minimum number necessary to provide functional construction access and
installed prior to overlot grading activities. Whenever the construction entrance exists
onto a road, the road shall be cleaned at the end of each day.
• Silt Fence (shown as SF on the Erosion Control Plan) is a temporary BMP that is
typically used as filter structures in areas of sheet water flow such as landscape
slopes. A silt fence is a geotextile fabric attached to wooden posts and trenched into
the ground. A silt fence can be used where runoff is conveyed from a disturbed area
as sheet flow. Silt fence is not designed to receive concentrated flow or to be used as
a filter fabric. Typical uses include down slope of a disturbed area to accept sheet
flow, along the perimeter of a receiving water such as a stream, pond or wetland, and
at the perimeter of a construction site.
• Concrete Washout Area (shown as CWA on the Erosion Control Plan) is a
designated area designed to receive wash water from washing of tools and concrete
mixer chutes, liquid concrete waste from dump trucks, mobile batch mixers, or pump
trucks, that acts as a temporary BMP. Concrete washout areas must be designated on
all sites that will generate concrete wash water or liquid concrete waste from onsite
concrete mixing or concrete delivery. Concrete washout activities must be conducted
in a manner that does not contribute pollutants to surface waters or stormwater runoff.
Concrete washout areas may be lined or unlined excavated pits in the ground,
commercially manufactured prefabricated washout containers, or aboveground
holding areas constructed of berms, sandbags, or straw bales with a plastic liner.
• Rock Sock (shown as RS on the Erosion Control Plan) is a temporary BMP that is
constructed of gravel that has been wrapped by wire mesh or geotextile to form an
elongated cylindrical filter. Rock socks are typically used either as a perimeter
control or as part of inlet protection. When placed at angles in the curb line, rock
socks are typically referred to as curb socks. Rock socks are intended to trap
sediment from stormwater runoff that flows onto roadways as a result of construction
activities. Rock socks can be used at the perimeter of a disturbed area or along small
concentrated flow paths to control localized sediment loading. Cones should be
placed near Rock Socks in heavy traffic areas to minimize damage from vehicles.
• Wind Borne Sediment and Dust Control measures will be provided during the
construction process to control wind borne sediment. During grading activities, water
will be applied to the disturbed soils for the purpose of maintaining cohesion with
clay type soils and also to meet moisture requirements for compaction of disturbed
soils. Other measures of mitigation for wind erosion may include the timely
installation of seed and mulch following the establishment of final grade, and the
timely installation of pavement following completion of utility trenching operations
and curb construction. Please reference the City of Fort Collins “Dust Prevention and
Control Manual”.
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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Permanent BMP’s
• Permanent Seeding and Planting is the establishment of a permanent perennial
vegetation such as trees, shrubs, vines, grasses/sod, or legumes on exposed areas for
final permanent stabilization in order to provide stabilization of the soil by holding
soil particles in place. It also reduces stormwater runoff velocity, maintains sheet
flow, protects the soil surface from erosion, promotes infiltration of runoff, and
improves wildlife habitat. The landscape plans for the site show the permanent
seeding and plantings.
• Preservation of Existing Vegetation should occur where no construction activity is
expected to occur. Preservation of natural vegetation is generally a permanent BMP
and is applicable to construction sites with pre-existing vegetation. Only land needed
for building activities and vehicle traffic needs to be cleared. For this site, the existing
trees will be preserved, while the rest of the existing vegetation will be removed.
• Linear Bioretention (Bioswale): Linear bioretention has low longitudinal slopes
and broad cross-sections that convey flow in a slow and shallow manner, thereby
facilitating sedimentation and filtering while limiting erosion. Berms or check dams
may be incorporated into the facility to reduce velocities and encourage settling and
infiltration. Linear bioretention is an integral part of the LID concept.
• Extended Detention Basin: An extended detention basin (EDB) is a sedimentation
basin designed to detain stormwater for many hours after storm runoff ends. This
BMP is similar to a detention basin used for flood control, however; the EBD uses a
much smaller outlet that extends the emptying time of the more frequently occurring
runoff events to facilitate pollutant removal.
3.2 Erosion Control Sequencing
The following is the proposed erosion control sequencing:
Prior to Construction
Preserve Existing Vegetation – Before construction commencement, areas that are not
disturbed by construction activity should be preserved as needed with construction
fencing, silt fencing, or other means to keep vehicular traffic out of the area to be left
undisturbed. For this site, the existing trees and bushes will be preserved as noted on the
engineering and landscape plans.
Inlet/Gutter Protection/Rock Socks – Rock socks will be placed at curb inlets and gutters
located adjacent to the site immediately prior to earth disturbing activities, if applicable.
Silt Fence – Before earth disturbing activities, silt fence will be placed downstream of
areas where runoff from construction activities are expected to occur. In particular for
this site, silt fence will be place downstream of the proposed stockpile area (if
applicable). Silt fence will be placed near the curb on the east side of the site.
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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Vehicle Tracking Control – Before construction commencement but after a portion of
asphalt demolition, vehicle tracking control shall be placed at points of ingress and
egress. It should also be placed at the stockpile area exits (if applicable).
During Construction
Wind Borne Sediment and Dust Control – Wind borne sediment and dust control
measures should be implemented during all dust generating activities.
Slope Protection – Surface roughening, and contour furrows shall occur after rough
grading. For this site, the majority of steeper slopes that may require surface roughening
are shown on the grading and erosion control plans.
Permanent Seeding – Permanent seeding or landscaping shall be placed immediately in
areas that are final graded and where little future disturbance is expected. In particular,
permanent seeding should be included in the landscaped areas, and other areas that are
not to be disturbed as part of construction.
Temporary Seeding – The majority of the landscaped areas will be permanently
seeded/planted. However, if the roadways/parking lots do not have base course placed on
them or the lots are left disturbed without permanent stabilization 30 days after grading,
temporary seeding will be required.
Post Construction
Refer to Final Stabilization and Long-term Stormwater Quality below.
3.3 Materials Handling and Spill Prevention
The site development will include the appropriate construction staging areas. Stormwater
runoff generated from the staging areas will be routed to a temporary sedimentation area
where runoff will be contained and filtered before being discharged off site. Reference
the Erosion Control Plan in the Appendix for the location of the staging area (as
applicable). The staging/stockpile area(s) may be moved to a location no closer than 100’
from a stormwater conveyance. Vehicle tracking control should be placed at the stockpile
area entrance/exit and silt fence should surround it. If the stockpile/staging area(s) is
moved, the SWMP should be updated.
Chemicals, fuels, lubricants, and paints typical with building construction stored on-site
will be in water tight containers and covered as necessary and stored in a bermed area, a
storage building, or within a vehicle to act as secondary containment. Storage of onsite
materials including building materials, fertilizers, waterline, sanitary sewer, and storm
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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sewer will be covered and placed on pallets to prevent direct contact with the ground and
potential surface runoff.
Other hazardous waste disposal (that is not typical to commercial building construction)
is not included within this SWMP. OSHA standards shall be followed. Concrete and
asphalt batch plants are not anticipated on this site and thus are not included in this
SWMP
In the event of a spill or accident, it shall be contained and disposed of so that it will not
flow from the site or soak into the soil. Once construction is completed, concrete waste
and contaminated soil will be disposed of properly. The SWMP Administrator should be
notified of spills.
V. POTENTIAL POLLUTANT SOURCES
Solid waste materials, including disposable materials incidental to the major construction
activities, will be collected in containers. The containers will be emptied periodically and trucked
away from the site.
Water used to establish and maintain grass, for dust control, and for other purposes during the
construction phase must originate from a public water supply or private well approved by the
Colorado Department of Public Health and Environment unless otherwise approved.
Sanitary facilities shall be provided at the site throughout construction activities. They shall be
utilized by construction personnel and serviced regularly by a commercial operator. Locate toilet
facilities approximately 50 ft. away from storm drain inlets and waterways to prevent accidental
spills and contamination of stormwater. Provide tie-downs or stake-downs for portable toilets.
All Disturbed and Stored Soils: The site disturbs 4.26 acres of land. Silt fence around the
perimeter of the site and rock socks along curb and gutter will be used to prevent sediment
leaving the site.
Vehicle Tracking of Sediments: A vehicle tracking pad is to be installed at the northwest
entrance along Harmony Road. At the end of each workday the contractor is to sweep the south
flowline of Harmony Road to remove any sediment in the street.
Management of Contaminated Soils: Please reference Section 3.3 Materials Handling and
Spill Prevention.
Loading and Unloading Operations: Steps should be taken to minimize the movement of soil
from the site. Contractors and laborers shall park in specified areas on-site. When
loading/unloading equipment from vehicles, load/near the site entrance, to minimize the
movement of soil from the site.
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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Outdoor Storage Activities: Contractor to determine the best location for outdoor storage.
Outdoor storage is to be surrounded by silt fence with vehicle tracking control at the entrance.
Vehicle and Equipment Maintenance and Fueling: All vehicles and equipment will be fueled
offsite, before arriving to the site. Maintenance and repair of vehicles and equipment will also
occur offsite.
Significant Dust or Particulate Generating Processes/Saw Cutting and Grinding: Dust will
be prevented from leaving the site by the silt fence. To mitigate on-site dust, water will be used
at the end of each workday on temporary areas that are prone to produce dust, or straw is to be
matted over areas of long-term risk. Street saw cuts will be required along Harmony Road and
Shields Street. These saws generate a significant amount of dust. Watering the cutting surface to
prevent airborne particulates (BMP in the City’s Fugitive Dust Manual) is required. The cutting
slurry has a high content of fine particulates (Silica Dust, Metals, etc.) that is not allowed to
discharge as runoff from the site. To prevent slurry from discharging offsite, contractors will use
the minimum amount of water needed to prevent dust and blades from overheating (site
management control). Cutting slurry will be collected via vacuum or allowed to dry out and be
scraped and swept up after the cutting has finished (saw cutting).
Routine Maintenance Activities Involving Fertilizer, Pesticides, Detergents, Fuels, Solvents,
Oils, etc: Fertilizers and Pesticides will be used during the later phases of the project when
trying to establish a healthy vegetation. These chemicals are highly water soluble and are easily
and unnoticeably carried in the stormwater. Proper application rates and recommended timing of
application will be strictly followed and not on days, or the next day, where the weather is
calling for precipitation (materials management control). As most of these types of chemicals
will be brought on by the landscaper, they will be required to keep these products in their
vehicles until time of application and not be allowed to leave these materials on the site. If these
materials are stored on site, they shall be kept inside or outside covered and above the ground to
prevent the materials from mixing with water and runoff (materials management control).
Detergents, paints, acids, cement, grout, and solvents will be prevalent in the interior work of the
building (materials management). These materials also are typically easily mixed with water yet
are typically noticeable by discolored, cloudy, or sudsy water. As such, the contractor will
always keep an eye out for these types of differences in water around the site (site management
control). However, these materials are to be handled, operated, and cleaned up all within the
inside of the structure, where external use is concerned these materials will be stored in the
construction connex box, trailers, vehicles, or the like out of contact with precipitation (materials
management). If not stored in a location as described secondary containment will be required
(materials management). Fuels and oils might be associated with the smaller equipment used on
site, chainsaws, pumps, generators, etc. As petroleum products are easily suspended in water and
are spread across the top of the water surface. These products when located in water have
rainbow sheen on them. They are also monitored during construction (site management controls).
These products will be stored in the construction connex box, trailers, vehicles, or similar
structure that will minimize contact with precipitation (materials maintenance controls). If not
stored in a location as described secondary containment will be required (materials
maintenance). Any untreated runoff from these activities can be detrimental to wildlife if not
cleaned up.
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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On-site Waste Management Practices: Contractor to provide location of waste material
stockpile, with the knowledge that any stockpile is to be a minimum of 50 feet from any inlet
structures or watercourses.
Concrete Truck/Equipment Washing, Including the Concrete Truck Chute and Associated
Fixtures and Equipment: See Erosion Control Plan for the location of the concrete washout
area. All excess concrete is to be disposed of in the concrete washout area.
Non-industrial Waste Sources Such as Worker Trash and Portable Toilets: On-site
dumpster and portable toilet are to be placed by contractor with the knowledge that they must be
50 feet from any inlet structure or watercourses.
Other Areas or Procedures where Potential Spills can Occur: The water table was not
encounter in the first 10 feet. Dewatering will not be anticipated for this site.
Waste Management and Contaminated Soils Removal: All contaminated soils must be
removed from the site to prevent on-site disposal of solid waste. Provide storage in accordance
with Spill Protection, Control and Countermeasures (SPCC) requirements and plans and provide
cover and impermeable perimeter control, as necessary, for hazardous materials and
contaminated soils that must be stored on site. When construction is complete, debris, unused
stockpiles and materials should be recycled or properly disposed. In some cases, this will require
disposal of contaminated soil from equipment leaks in an appropriate landfill.
Locate waste-collection areas away from streets, gutters, watercourses, and storm drains. Waste-
collection areas (dumpsters and such) are often best located near construction site entrances to
minimize traffic on disturbed soils. Consider secondary containment around waste collection
areas to minimize the likelihood of contaminated discharges. Construction-related materials,
debris and waste must be removed from the construction site once construction is complete.
Trash and bulk waste-collection areas on-site will be designated with appropriate signs.
Dedicated Concrete and Asphalt Batch Plants: There will not be any dedicated asphalt or
concrete batch plants on-site.
VI. FINAL STABILIZATION AND LONG-TERM
STORMWATER QUALITY
Final stabilization is reached when all soil disturbing activities at the site have been completed
and vegetative cover has been established with a density of at least 70 percent of pre-disturbance
levels or when equivalent permanent erosion reduction methods have been utilized. Final
stabilization shall be performed in accordance with the City of Fort Collins Stormwater
Standards Manual. Upon final stabilization, temporary BMP’s may be removed, unless they are
required to remain in place for future phasing.
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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Soil amendments shall be provided and documented in accordance with City Code Section 12-
132. The soil in all landscape areas, including parkways and medians, shall be thoroughly
loosened to a depth of no less than eight inches and soil amendment shall be thoroughly
incorporated into the soil of all landscape areas to a depth of at least six inches by tilling, discing
or other suitable method, at a rate of at least three cubic yards of soil amendment per one
thousand square feet of landscape area. Prior to the issuance of any certificate of occupancy, a
written certification must be submitted to the city that all planted areas, or areas to be planted,
have been thoroughly loosened and the soil amended, consistent with the requirements set forth
in Section 12-132.
To the maximum extent feasible, topsoil that is removed during construction activity shall be
conserved for later use on areas requiring revegetation and landscaping. Areas disturbed shall be
reseeded. Please see the approved Landscaping Plan.
VII. INSPECTION AND MAINTENANCE PROCEDURES
The temporary BMP’s will be inspected and documented at a minimum of once every 14 days
and within 24 hours after each precipitation or snowmelt event. The SWMP will be kept up-to-
date with inspection records, maintenance procedures, and changes. Records should include
complete inspection reports for each inspection, maintenance and repair reports as a result of the
inspections, and records of maintenance as indicated in the City of Fort Collins Stormwater
Standards Manual, manufacturer’s specifications, or other acceptable sources. A record-keeping
system is recommended in managing inspection and maintenance reports and should include all
maintenance records, spill response, weather conditions, training, correspondence, etc.
Preventative maintenance also involves the regular inspection and testing of equipment, timely
maintenance of the equipment, and complete records of the maintenance and inspections of the
equipment. The maintenance and inspection records should be kept on site and made available
upon request.
Inspections must include the observation of the construction site perimeter, runoff discharge
points, disturbed areas, staging areas (including concrete washout areas and fueling areas),
erosion and sediment control measures identified in this SWMP, and any other structural BMP’s
that may require maintenance. The inspection must determine if there is evidence of, or potential
for, pollutants to enter the drainage system and if they should be modified, replaced, or added to.
The following includes some maintenance procedures:
• Erosion and sediment control measures determined, upon inspection, to be in need of
repair shall be maintained as soon as site is accessible on items or areas identified in
the inspection report. Most repairs should be completed within 24 to 48 hours.
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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• Locations where vehicles enter or exit the site shall be inspected for evidence of
sediment being tracked off-site by construction traffic. Such sediment shall be
removed before it can be conveyed to the receiving storm drains or creeks.
• Rock at inlet protection will be checked regularly for sediment buildup which will
prevent drainage. If the rock is clogged with silt, it will be removed and cleaned or
replaced.
• Seeded areas will be checked to see that grass coverage is maintained. Areas will be
watered, fertilized and reseeded as needed.
• It is the responsibility of the Operator to maintain effective pollutant discharge
controls. Actual physical site conditions or contractor practices could make it
necessary to install more control than are shown on the Erosion Control Plan. For
example, localized concentrations of surface runoff or unusually steep areas could
require additional erosion control devices. Assessing the need for, and implementing
additional controls will be a continuing aspect of the SWMP until final stabilization.
This plan intends to control water-borne and liquid pollutant discharges by some
combination of interception, filtration, and containment. Parties implementing this
plan must remain alert to the need to periodically refine and update the plan in order
to accomplish the intended goals.
• Sediment that has escaped the construction site must be removed at a frequency
sufficient to minimize off-site impacts.
VIII. REFERENCES
“Fort Collins Stormwater Criteria Manual”, City of Fort Collins, Adopted December 2018
Natural Resources Conservation Service Web Soil Survey at websoilsurvey.nrcs.usda.gov/app
Urban Storm Drainage Criteria Manual, Volumes 1, 2, and 3, Urban Drainage and Flood Control
District, April 2008
STORMWATER MANAGEMENT PLAN FOR FORT COLLINS MONTESSORI SCHOOL
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IX. APPENDIX A
• Vicinity Map
• Soils Report
• SWMP Escrow
• Erosion Control Plan
• Erosion Control Details
Soil Map—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
8/28/2019
Page 1 of 3
4485700 4485720 4485740 4485760 4485780 4485800 4485820 4485840 4485860 4485880 4485900
4485700 4485720 4485740 4485760 4485780 4485800 4485820 4485840 4485860 4485880 4485900
491690 491710 491730 491750 491770 491790 491810 491830 491850
491690 491710 491730 491750 491770 491790 491810 491830 491850
40° 31' 25'' N
105° 5' 53'' W
40° 31' 25'' N
105° 5' 46'' W
40° 31' 18'' N
105° 5' 53'' W
40° 31' 18'' N
105° 5' 46'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 50 100 200 300
Feet
0 15 30 60 90
Meters
Map Scale: 1:1,050 if printed on A portrait (8.5" x 11") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
3 Altvan-Satanta loams, 0 to 3
percent slopes
4.7 100.0%
Totals for Area of Interest 4.7 100.0%
Soil Map—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
8/28/2019
Page 3 of 3
Project: Disturbed Acres: 4.26
Reseeded Area: 2.00
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
Ea. 7 $150.00 $1,050.00
Ea. 8 $100.00 $800.00
Ea. 1 $928.00 $928.00
Ea. 1 $1,750.00 $1,750.00
Ea. 2 $150.00 $300.00
LF 1150 $1.90 $2,185.00
Sub-Total: $7,013.00
1.5 x Sub-Total: $10,519.50
Amount of security: $10,519.50
Total Acres x Price/acre: $2,180.00
$1,090.00 Sub-Total: $2,180.00
1.5 x Sub-Total: $3,270.00
Amount to Re-seed: $3,270.00
Minimum escrow amount: $3,000.00
Erosion Control Escrow: $10,519.50
Erosion and Sediment Control Escrow/Security Calculation
for The City of Fort Collins
BMP Amount
Vehical Tracking Pad
Reseeding Amount
Inlet Protection
Silt Fence
Miniumum Escrow Amount
Fort Collins Montessori School
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”
Rock Sock (Curb)
Concrete Washout Area
Final Escrow Amount
Waddle Dike
10/21/2019 3:55 PM R:\2200\2259.03 Fort Collins Montessori School\HYDRO\Stormwater Management Plan\FCMS SWPM Escrow.xls
N
UTILITY PLANS FOR
FORT COLLINS MONTESSORI SCHOOL
ENGINEERING & SURVEYING
4045 St. Cloud Drive, Suite 180
Loveland, CO 80538
[P] 970-622-2095 [F] 970-461-4469 LOT 1, MONTESSORI SUBDIVSION
NE1
4 OF SECTION 3, T6N, R69W, 6TH P.M., CITY OF FORT COLLINS, COUNTY OF LARIMER, STATE OF COLORADO
DWG. NAME
17
NO. REVISION DATE
SHEET NO.
OF
PROJECT:
DATE:
DESIGNER:
DRAFTER:
CHECKED BY:
APPROVED BY:
2259.03
12/13/2019
TWC
TWC
NOT FOR CONSTRUCTION
PRELIMINARY
Know what's below.
Call before you dig.
R
BENCHMARK STATEMENT
LEGEND:
DRAINAGE & EROSION CONTROL PLAN
C-12
12
___
___
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL
PROPOSED BASIN FLOWS
EROSION BMP LEGEND
DETENTION SUMMARY
& REMOVAL OF BMP'S
SEQUENCE FOR INSTALLATION
EXISTING BASIN FLOWS
NOTE
UTILITY PLANS FOR
FORT COLLINS MONTESSORI SCHOOL
ENGINEERING & SURVEYING
4045 St. Cloud Drive, Suite 180
Loveland, CO 80538
[P] 970-622-2095 [F] 970-461-4469 LOT 1, MONTESSORI SUBDIVSION
NE1
4 OF SECTION 3, T6N, R69W, 6TH P.M., CITY OF FORT COLLINS, COUNTY OF LARIMER, STATE OF COLORADO
DWG. NAME
17
NO. REVISION DATE
SHEET NO.
OF
PROJECT:
DATE:
DESIGNER:
DRAFTER:
CHECKED BY:
APPROVED BY:
2259.03
12/13/2019
TWC
TWC
NOT FOR CONSTRUCTION
PRELIMINARY
Know what's below.
Call before you dig.
R
DETAIL SHEET 3
C-16
16
RJP
RJP
’
“ ”
’
’
STANDARD EROSION CONTROL NOTES
’
“ ”
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 13, Sep 10, 2018
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Aug 11, 2018—Aug
12, 2018
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Soil Map—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
8/28/2019
Page 2 of 3