HomeMy WebLinkAbout3009 S TAFT HILL RD SINGLE FAMILY - FDP190027 - SUBMITTAL DOCUMENTS - ROUND 4 - STORMWATER MANAGEMENT PLANStormwater Management Plan
for
Couture Residence
2050 Falcon Drive
In the NE ¼ of Section 28, Township 7 North, Range 69 West
Lot 2, Couture Subdivision
Couture Subdivision
City of Ft. Collins
Larimer County, Colorado
REPORT NO. 19-024
July 22, 2020
Couture SWMP.docx
Stormwater Management Plan
for
Couture Residence
2050 Falcon Drive
Lot 2, Couture Subdivision
Couture Subdivision
City of Ft. Collins, Larimer County, Colorado
Project No. 19-024
July 22, 2020
prepared for
Dustin Couture
305 S. Impala Drive
Ft. Collins, CO 80521
970-659-2955
prepared by
Prism Design & Consulting Group, Inc.
PO Box 441730
Aurora, CO 80044-1730
(720) 689-7324
7/23/20
i
TableofContents
_
TableofContents ......................................................................................... i
StormwaterManagementPlan....................................................................... 1
1 Site Description ............................................................................................................................. 1
1.1 Site Overview ................................................................................................................................ 1
1.2 Natural Resources ......................................................................................................................... 1
1.3 Construction Activities .................................................................................................................. 2
1.4 Activities Sequence ....................................................................................................................... 2
4. Project Closeout. .......................................................................................................................... 3
1.5 Ground Cover ................................................................................................................................ 3
1.6 Receiving Waters .......................................................................................................................... 3
1.7 Area & Volume Estimates ............................................................................................................. 3
2 Potential Pollution Sources .......................................................................................................... 3
2.1 Potential Stormwater Pollution Sources ...................................................................................... 4
2.2 Potential Non-Stormwater Pollution Sources .............................................................................. 4
3 Site Erosion Control Map .............................................................................................................. 4
4 Best Management Practices for Stormwater Pollution Prevention ............................................. 5
4.1 Structural Erosion and Sediment Controls ................................................................................... 5
4.2 Nonstructural Erosion and Sediment Controls ............................................................................. 6
5 Final Stabilization and Long-Term Stormwater Management ..................................................... 7
6 Other Stormwater Pollution Controls ........................................................................................... 8
7 Construction Scheduling ............................................................................................................... 8
8 Inspection and Maintenance ........................................................................................................ 8
Sources ............................................................................................................ 11
Appendix ........................................................................................................... A
Sample Field Inspection Sequence and Field Inspection Report ......................................................... A
BMP Installation and Maintenance Details ........................................................................................... A
Site Map (Grading, Erosion, and Stormwater Quality Plan) ................................................................. A
1
19-024
StormwaterManagementPlan
The Colorado Department of Public Health and Environment (CDPHE) has developed the Colorado Discharge
Permit System to establish statewide compliance with Federal environmental standards. This Stormwater
Management Plan (SWMP) is intended to demonstrate compliance with the Colorado Discharge Permit System,
and specifically the General Permit for Stormwater Discharges Associated with Construction (Stormwater
Construction Permit). This document has been prepared according to the guidelines provided in the State of
Colorado Stormwater Management Plan Guidance for Stormwater Discharges Associated with Construction
Activity General Permit Application and Stormwater Management Plan Preparation Guidance. This SWMP
identifies possible pollutant sources that may contribute pollutants to stormwater and identifies Best
Management Practices (BMPs) that will reduce or eliminate any possible water quality impacts.1
A current copy of this SWMP must be maintained on the project site for the duration of the construction and
stabilization period.
The Permit Holder or their agent will designate a SWMP Administrator for this project. The SWMP Administrator
may be the Construction Project Manager, Owner, Construction Site Superintendent or other party so designated
by the Permit Holder or their agent. The SWMP Administrator is responsible for implementing, maintaining, and
revising the SWMP. The SWMP Administrator is the contact for all SWMP related issues. The SWMP
Administrator will have specific site knowledge and authority to adequately manage and direct day-to-day
stormwater quality management activities at the site.2
1 Site Description
1.1 Site Overview
The Couture Residence site (site) is located in the City of Ft. Collins, Larimer County, Colorado, on the west
side of S. Taft Hill Road, just north of the Pleasant Valley and Lake Canal, just north of Falcon Drive.
The existing and proposed zoning is Residential-Agricultural. This zoning allows for the proposed residential
use.
The site includes approximately 4.2 acres, of which, roughly 2.1 acres of the proposed development site will
be disturbed with this project. The stormwater runoff generally flows to the north and slightly east,
ultimately flowing onto the property to the north.
1.2 Natural Resources
According to the Federal Emergency Management Agency's Flood Insurance Rate Map (FIRM) Community
Panel Number(s) 08069CO986 G, effective May 2, 2012, for the City of Ft. Collins, Colorado, the site is not
located within a Federal Emergency Management Agency (FEMA) designated Special Flood Hazard Area
(SFHA).3
According to the National Resource Conservation Service (NRCS), the soil in the area of the Couture
Residence site is made up of “Altvan-Satanta loams, 0 to 3 percent slopes” (map unit jpw2). “Altvan-
Satanta loams, 0 to 3 percent slopes” is typically deep and well drained. Permeability is moderate above a
depth of about 36” and rapid below that depth, surface runoff is slow, and the hazard of erosion is slight to
1 (CDPHE-G, 2019), Section II
2 (CDPHE-G, 2019), Section IV.1
3 (FIRM)
2
Couture SWMP.docx
moderate. “Altvan-Satanta loams, 0 to 3 percent slopes” is classified as being part of Hydrologic Soil Group
B. The soil has good potential for urban development.4 5
1.3 Construction Activities
The primary proposed construction includes the construction of a single-family residence near the west
end of Lot 2. The residence will include a nearly 5,800 square foot (SF) house, inclusive of a garage, plus
porch & patio, and a gravel driveway. There are two outbuildings totaling around 1,000 SF that will be
removed and an additional outbuilding around 1,150 SF that may be removed from the south property line
replaced at the north.
Utilities to this new residence will enter from the south, where they will be installed under a working
irrigation ditch by means of directional boring in a manner not to disturb the function of the ditch.
Stormwater improvements on this site will be limited to construction of swales around ground and building
features, plus sediment and erosion control features.
1.4 Activities Sequence
Construction activities will be determined as required by the general Contractor. Prism Design & Consulting
Group anticipates construction activities to progress as follows:
1. Prior to commencement of construction
□ Install Vehicle Tracking Control at all construction entrances.
□ Install Silt Fence along the perimeter of the construction site, on the downhill (northern)
edge of grading, along existing contours, and around other points of potential
contamination (portable toilets, staging areas, stockpile areas, etc.).
□ Place Portable Toilet(s).
2. Preliminary Site Grading
□ Strip topsoil and stockpile within designated stockpile areas outside of primary grading
operations. Topsoil shall only be removed from areas being re-graded. This is a small
site, so it is anticipated that the entire area to be re-graded may be stripped at this time.
□ Perform general site grading, stockpiling excavated dirt in the designated soil stockpile
area. Include grading for road improvements, with profile, site ditches and other roadway
features. Include also grading for detention facilities.
□ Install interior, grading-specific erosion control devices (Sediment Control Logs, Erosion
Control Blankets, Surface Roughening).
3. General Construction
□ Excavate for site drainage and drainage structures.
□ Install concrete washout.
□ Construct concrete building foundations and drainage structures. Rinsing of construction
vehicles and equipment mixing or carrying concrete will only be performed in designated
concrete rinse facilities. Concrete rinse facilities will only be used for the minimum
necessary rinsing and will not be used for cleaning or emptying of construction vehicles
and equipment. Cleaning and emptying of excess concrete will occur off site. Depending
on the complexity of the site and overall scheduling of the project, installation of necessary
BMPs, excavation for foundation, and foundation construction may be moved before
general site grading.
□ Install drainage culverts and underground storm drain pipes.
4 (WSS)
5 (NRCS)
3
19-024
□ Install inlet protection around inlets and culvert entrances.
□ Backfill structures and drainage systems.
□ Upon completion of primary ground disturbing activities, re-distribute topsoil over
exposed areas not planned to be paved. Also, apply seeding and mulch to areas that will
be exposed for prolonged periods.
□ Continue construction of site superstructure(s).
□ Prepare for paving with placement of Aggregate Base Course as directed in pavement
design.
□ Construct curb, gutter and sidewalk surfaces.
□ Pave road and site parking areas as directed in pavement design.
□ Removed Concrete Washout.
□ Remove interior BMPs that will be in the way of any remaining grading and landscaping
operations.
□ Perform minor touch-up grading.
□ Place final seeding, mulching and other landscaping.
4. Project Closeout.
□ Silt Fence shall remain until Final Stabilization has been achieved.
□ Remove inlet and outlet protection identified as temporary and rock socks from paved
areas
□ Upon Site Stabilization, remove all remaining temporary controls such as Silt Fence.
□ Place seeding and mulch at disturbed areas.
Project closeout will be established at final stabilization, as defined in the Urban Drainage Criteria Manual
(Criteria Manual)6. Construction Scheduling is as defined in Section 7, below.
1.5 Ground Cover
This site is currently used for agricultural purposes. Relatively thick Buffalo grasses are prominent in areas
generally exposed to the sun, and tall fescues/western wheatgrass cover in shaded areas, mostly along the ditch.
The grasses historically have been fairly thick, approximately 80-90% cover density.
1.6 Receiving Waters
Runoff from this site flows north, toward Spring Creek, located approximately 1,600 feet north of the
property. Water in Spring Creek flows east about 4.5-5 miles before entering the Cache La Poudre drainage.
1.7 Area & Volume Estimates
The site encompasses approximately 4.2 acres. Within that total area, approximately 2.1 acres are
expected to undergo clearing, placement of fill, excavation, grading or other disturbance due to the
construction activities of the Couture Residence.
Earthwork activities will comprise of 825 cubic yards (CY) of cut, and 615 CY of fill. Assuming compacted
soils will have about 10% higher density than natural embankment densities, there will be an excess of
approximately 150 CY of excess material will need to be hauled offsite.
2 Potential Pollution Sources
6 (MHFD, 2010), Ch. 7, 3.1
4
Couture SWMP.docx
2.1 Potential Stormwater Pollution Sources
Sediment will be the primary source of potential water pollution from the Couture Residence site. Exposed
areas of the construction site have the potential to erode under abrasive conditions created by wind and
stormwater. This eroded sediment may be transported from the exposed surfaces of the site to downstream
locations, including on-site or downstream offsite properties or even to the receiving waters. Measures to
reduce erosion will be used, in conjunction with the Criteria Manual. These Erosion Control and
Sediment Reduction measures are further described in the Best Management Practices for Stormwater
Pollution Prevention section, below.
Storage of large volume of dangerous chemicals will not occur on-site. Any fuel, oil, antifreeze, or other
common chemicals used for vehicles and equipment may be stored on-site in small quantities, provided
that all such materials are be stored in containers or facilities that will adequately protect the ground from
contamination from said chemicals. Storage of materials is described in the Best Management Practices
for Stormwater Pollution Prevention section, below.
Vehicles shall be adequately maintained to reduce the potential for ground water pollution resulting from
leaking machinery and vehicles. Only minor maintenance of machinery and vehicles shall be permitted on
the site to reduce the potential for contamination resulting from leaks or spills during maintenance.
Appropriate procedures will be taken to limit the potential of stormwater pollution from spills and leaks.
Any leaks or spills shall be noted on the inspection logs; significant spills shall be reported to the SWMP
permitting authority and compliance officer. Proper handling of vehicles and equipment is described in the
Section 4, below, Best Management Practices for Stormwater Pollution Prevention.
Vehicle and equipment washing may not be performed on-site, except that “Rinsing of construction
vehicles carrying concrete may only be performed in designated concrete rinse facilities.”
2.2 Potential Non-Stormwater Pollution Sources
Water from the rinsing of construction vehicles carrying concrete is both a potential stormwater runoff
source of pollution, as described above, as well as potential for pollution from non-stormwater runoff. This
non-stormwater runoff is not permitted under the Stormwater Construction Permit. The installation of
concrete rinse facilities will mitigate the potential of such rinse water becoming a non-stormwater runoff
source.
Irrigation for the establishment and/or maintenance of ground cover is also a potential source of non-
stormwater runoff from the site. This non-stormwater source is permitted under the Stormwater
Construction Permit, provided that appropriate irrigation practices will be used to limit the potential of
runoff. Any runoff that does occur shall be treated with the same control measures applied to stormwater
runoff. Proper management of the irrigation schedules and duration will minimize excess irrigation runoff.
The construction BMP's described below which are to remain in place until ground cover is established, as
well as the permanent BMP's described below will mitigate the potential of such irrigation water becoming a
non-stormwater runoff source.
3 Site Erosion Control Map
A Site Erosion Control Map is included with this SWMP for the Couture Residence project. The Site Erosion
Control Map includes boundaries for the limits of construction, proposed disturbed ground surface areas,
delineation of cut and fill limits, soil stockpile areas, staging areas, the locations of Best Management
Practices (BMPs), the soil type boundaries, existing and proposed contours, proposed structures and
improvements, locations of existing water courses (if any exist), locations of existing 100-year floodplains
(if any exist), and locations of existing and proposed utilities. Asphalt or concrete batch plants are not
planned and therefore are not shown on the Site Erosion Control Map.
5
19-024
4 Best Management Practices for Stormwater Pollution Prevention
The processes and methods for protecting against stormwater pollution during construction is known as
Best Management Practices, or BMPs. BMPs include both “structural” and “non-structural”. “Structural
BMPs” refers to any engineered structure constructed to provide temporary storage or treatment of
stormwater runoff. “Structural BMPs” include all source control devices intended to protect against
erosion from happening in the first place. 7 Because sediment resulting from erosion is typically the primary
pollutant of stormwater runoff from a construction site, erosion control practices are considered the
primary and preferred method of stormwater pollution prevention in this SWMP, while sediment control
practices will be implemented as secondary measures or when erosion control practices are not possible
or are not fully effective. Prevention of stormwater pollutants other than sediment is addressed under an
additional set of materials handling and spill prevention BMPs.
“Non-structural BMPs” refers to operational and managerial techniques to minimize soil exposure to
runoff.
4.1 Structural Erosion and Sediment Controls
Before construction activities commence in any area of the site, the construction vehicle traffic areas to
and around that area – including all construction roads, parking areas, loading and unloading zones, storage
areas, and staging areas – will be stabilized through proper grading, compaction, and surfacing.
Stabilization of traffic areas reduces erosion and vehicle tracking thus helping to eliminate potential
pollution of stormwater by sediment. To prevent vehicle tracking of soil into the surrounding roadways,
construction related traffic will be limited to entering the site at the designated construction entrance(s).
The construction entrance will have a Vehicle Tracking Control as described above. Should significant soil
still be deposited on the surrounding roadways, street sweeping will be utilized to remove the soil from the
roadways immediately following deposition. The locations of areas to receive traffic area stabilization are
identified on the Site Erosion Control Map, and specifications for the installation and maintenance of
surface stabilization are included in the Appendix.
Before any other construction activities commence on the site, vehicle tracking controls will be installed at
all site access points. Vehicle tracking control helps reduce the deposition of sediment, dirt, mud, and
debris by vehicles exiting the site onto the streets adjacent to the site. The locations of site entrance vehicle
tracking controls are identified on the Site Erosion Control Map, and details for the installation and
maintenance of the controls are included in the Appendix.8 If sediment continues to be deposited on the
streets outside of the construction area, then periodic street sweeping shall be required to remove
construction-related sediment from the adjacent street system.9
Before any construction activities commence on the Couture Residence site, inlet protection will be installed
around all existing storm drain inlets, culvert inlets, and other drainage structure inlets that may receive
runoff from the site, including inlets on the site and in nearby roads or properties. Additionally, inlet
protection will be installed around all storm drain inlets, culvert inlets, and other drainage structure inlets
installed on the site immediately after the installation of the inlet. Inlet protection reduces sediment
deposition in storm drains and culverts and reduces sediment pollution in stormwater by “filtering” out
some of the sediment carried by runoff flowing through the inlet protection. The locations of inlet
protection are identified on the Site Erosion Control Map, and details for the installation and maintenance
of the inlet protection are included in the Appendix. In addition to the inlet protection indicated on the
Site Erosion Control Map, inlet protection will be installed wherever the contractor deems them to be
necessary or helpful. Inlet protection installed at the contractor's discretion might not be shown on the
Site Erosion Control Map.10
7 (CDPHE-G, 2019), Section IV.5
8 (MHFD, 2010), SM-4
9 (MHFD, 2010), SM-7
10 (MHFD, 2010), SC-6
6
Couture SWMP.docx
Before any grading or other significant disturbance occurs on the site, Sediment Control Logs will be
installed along any edge of an area to be disturbed where runoff would otherwise go untreated. Sediment
Control Logs will be also installed along those portions of the site perimeter where runoff may transport
sediment onto adjacent properties. Sediment Control Logs will also be installed along the downstream
edges of the topsoil stockpile. Sediment Control Logs will be required along the downstream side of
stabilized staging areas. Sediment Control Logs help reduce pollution of stormwater by “filtering” out some
of the sediment carried by runoff flowing through the logs and by facilitating deposition of sediment by
slowing the runoff. Sediment Control Logs can also help reduce erosion by slowing and distributing runoff.
The locations of Sediment Control Logs are identified on the Site Erosion Control Map, and details for the
installation and maintenance of Sediment Control Logs are included in the Appendix. In addition to the
Sediment Control Logs indicated on the Site Erosion Control Map, they shall also be installed wherever the
contractor deems them to be necessary or helpful. Sediment Control Logs installed at the contractor's
discretion might not be shown on the Site Erosion Control Map.11
A Concrete Washout Area shall be installed on the site prior to any concrete placement activities. A
Concrete Washout Area captures and contains concrete wash water to prevent harmful pollutants in the
concrete mixture from entering the general environment either directly or through mixing with
stormwater.12 The location of the concrete washout area is identified on the Site Erosion Control Map. The
location, may also be determined by the SWMP Administrator if an alternate location is deemed
appropriate. Details for the installation and maintenance of concrete washout area are included in the
Appendix. A concrete washout area installed at the SWMP Administrator's discretion will be added to the
Site Erosion Control Map by the SWMP Administrator.
4.2 Nonstructural Erosion and Sediment Controls
In order to minimize the total amount of soil exposed at any given time to “reduce the period of accelerated
soil erosion”13 the construction activities of the Couture Residence project will be scheduled as described in
the above Activities Sequence section. In addition to the schedule described in the above Activities
Sequence section, many of the details and specifications included in the index provide specific scheduling
information.
An undisturbed “buffer” will be preserved around as much of the site as possible to help control erosive
run-on and sediment-laden runoff. The locations of undisturbed buffer areas are identified on the Site
Erosion Control Map.
Before construction activities commence in any area of the site, the full layer of topsoil will be stripped only
from the portions of that area that are to be disturbed and will be stockpiled in the soil stockpile location
identified on the Site Erosion Control Map. Rather than stripping topsoil from the entire site at once, as
has been the traditional practice in some cases, topsoil will be stripped from particular areas of the site
only as construction work progresses to that area as described in the above Activities Sequence section.
Soils stockpiled for more than 60 days will be seeded and mulched within 14 days of completion of
stockpiling activities.14
Mulch will be applied, in addition to soil roughening and seeding, to all disturbed areas (not otherwise
stabilized) immediately if possible or within 14 days of completion of final grading. Additionally, mulch will
be applied to all disturbed areas that are not at final grade but will remain dormant (undisturbed) for longer
than 30 days. Mulch helps prevent erosion “by protecting bare soil from rainfall impact, increasing
infiltration, and reducing runoff.”15 The locations of some areas to receive mulch are identified on the Site
Erosion Control Map (some areas requiring mulch may not be indicated), and specifications for revegetation
are included in the Appendix.
11 (MHFD, 2010), SC-1
12 (MHFD, 2010), MM-1
13 (MHFD, 2010), Ch 7, 2+.3
14 (MHFD, 2010), MM-2
15 (MHFD, 2010), EC-4
7
19-024
When seasonally appropriate, seed will be applied to all disturbed areas (not otherwise stabilized)
immediately if possible or within 14 days of completion of final grading. Additionally, seed will be applied
to all disturbed areas that are not at final grade but will remain dormant (undisturbed) for longer than 1
year. When the season is inappropriate for seed application, surface roughening and mulch will be applied
within 14 days and seed will be applied as soon as seasonally appropriate. The locations of some areas to
receive seed are identified on the Site Erosion Control Map (some areas requiring seed may not be
indicated), and specifications for revegetation are included in the Appendix.
In addition to non-structural source control BMPs, a vigorous program of “good housekeeping” will be
implemented on the Couture Residence site in an effort to prevent stormwater pollution by materials used
and stored on-site.
No significant storage of chemicals and other potentially pollutive materials will be allowed on-site. Only
those chemicals and materials necessary for the described construction activities may be stored on-site,
and then only in the smallest amounts reasonable and for the shortest time possible. The location of a
storage area for toxic, hazardous, and potentially pollutive materials is identified on the Site Erosion Control
Map and a specification for on-site materials handling is provided in the Appendix.
Portable toilets will be located away from direct traffic routs and will be situated out of the potential path
of any potential stormwater runoff. Any grading necessary to achieve such a situation will be completed
before the portable toilets are delivered to the site. The locations of portable toilets are identified on the
Site Erosion Control Map. Portable toilets will be securely anchored to prevent tipping.
Fueling and minor preventative maintenance of vehicles and equipment may occur only on areas
specifically stabilized for construction vehicle traffic. Appropriate procedures will be taken to limit the
potential of stormwater pollution from spills and leaks. The locations of areas specifically stabilized for
construction vehicle traffic are identified on the Site Erosion Control Map and a specification for vehicle
and equipment handling is provided in the Appendix. No significant maintenance of vehicles and equipment
and no vehicle and equipment washing will be performed on-site
Any spills of potential pollutants on the site related to the construction activities will be addressed
according to the requirements of Colorado Department of Public Health and Environment, Hazardous
Materials and Waste Management Division.
Appropriate spill prevention and response measures will be implemented on the site. The details and
specifications referenced above in this section provide general and specific guidelines for spill prevention
and response measures relating to the various potential non-sediment pollution sources.
No groundwater and/or stormwater dewatering activities are proposed or expected for the proposed
construction activities. If it is determined that dewatering activities are required for this site, said
dewatering shall be accomplished in conformance with local rules and regulations, and as approved by
Prism Design & Consulting Group, Inc.
No significant waste generation is expected as a result of the proposed construction activities. Any minor
waste that is produced will be disposed of properly and regularly. Contractor shall not permit dumpsters or
other waste receptacles to fill over the top of the container, nor may it fill high enough for wind gusts to pick
up debris and carry it offsite. Any debris deposited outside of proper containment locations shall be picked
up and disposed of appropriately.
5 Final Stabilization and Long-Term Stormwater Management
According to the Stormwater Construction Permit “Final stabilization is reached when all soil disturbing
activities at the site have been completed, and uniform vegetative cover has been established with a
density of at least 70 percent of pre-disturbance levels or equivalent permanent, physical erosion reduction
8
Couture SWMP.docx
methods have been employed.”16 Such a viable vegetative cover will be established within one year of
completion of construction activities on all disturbed areas not otherwise stabilized. Unless otherwise
indicated on a landscape plan, revegetation will be achieved through seedbed preparation, including but
not necessarily limited to soil roughening, seeding, mulching, and irrigating when specified. Soil
roughening, mulching, and seeding are all described in Section 4 above, Best Management Practices for
Stormwater Pollution Prevention, and specifications for surface stabilization and revegetation are included
in the Appendix.
In order to prevent or control erosion and pollution of stormwater by sediment after completion of
construction activities, many of the BMPs described in Section 4, above, Best Management Practices for
Stormwater Pollution Prevention, will remain in place until final stabilization. BMPs that must remain in
place until final stabilization shall be removed following final stabilization and the resulting disturbed areas
shall be seeded and mulched. The specifications or details corresponding to each BMP provide general
guidelines for the removal of the BMP.
6 Other Stormwater Pollution Controls
All stormwater pollution control measures to be implemented on the Couture Residence site are included
in the above sections Best Management Practices for Stormwater Pollution Prevention and Final Stabilization
and Long-Term Stormwater Management.
7 Construction Scheduling
The expected timing of the project is to install initial erosion control BMP's and start foundation
construction around August 2020. Site grading, building construction, and other site operations are
expected to continue through July 2021 with final stabilization by October 2021 or summer 2022. Activities
are expected to proceed as written above. Final Stabilization is described in a following section.
8 Inspection and Maintenance
The primary purpose of a regular inspection is to determine if there is evidence of, or the potential for,
pollutants entering the drainage system.17 The Stormwater Construction Permit requires that a thorough
inspection of the stormwater management system be performed and documented at least every 14 days,
and after any precipitation or snowmelt event...that results in stormwater running across the ground.”18
This is only a minimum requirement and more frequent inspection and regular maintenance of the
stormwater management system is typically necessary to effectively reduce pollutants in stormwater
discharges from a construction site. A thorough inspection of the Couture Residence site will therefore
be performed and documented weekly and after any precipitation or snowmelt event that results in
stormwater running across the ground.
The regular inspections of the site will include observation of the construction site perimeter and all
stormwater discharge points including storm drain system inlets and culverts. BMPs applied in the site
perimeter or around stormwater discharge points include inlet protection, site entrance vehicle tracking
controls, silt fences, straw bale barriers, and straw bale check structures. Specific inspection and
maintenance requirements for each of these BMPs are included in the Appendix.
The regular inspections of the site will also include observation of all disturbed areas and all stabilized and
revegetated areas. Inspection of these areas will involve particular attention on possible erosion problems.
Specifications for surface stabilization and revegetation are included in the Appendix and provide specific
inspection and maintenance requirements.
16 (CDPHE-G, 2019), Section IV.8
17 (CDPHE-G, 2019), Section V.4
18 (CDPHE-G, 2019), Section V.2
9
19-024
The regular inspections of the site will also include observation of material storage areas including waste
collection areas and topsoil stockpiles. Inspection of these areas will involve particular attention on
possible leeks and spills and, in the case of the topsoil stockpile, on possible ineffectively managed runoff.
Specifications for on-site materials handling and details for silt fence, used around topsoil stockpiles, are
included in the Appendix and provide specific inspection and maintenance requirements.
Concrete rinse facilities will be included in the regular inspections of the site but will require additional
attention when in use. Details of a concrete rinse facility, with specific inspection and maintenance
requirements, are included in the Appendix.
All physical BMPs on the site will be thoroughly examined during each inspection to determine if they still
meet the design and operational criteria in the SWMP and that they continue to adequately control
pollutants at the site.19 Details of each BMP, with specific inspection and maintenance requirements, are
included in the Appendix.
Following each inspection, repairs will be performed on BMPs that are found to no longer function as
needed and designed, and preventative maintenance will be exercised on BMPs as needed to ensure
continued operation. BMPs that have failed or have the potential to fail without maintenance or
modifications will be addressed immediately to prevent the discharge of pollutants. As described above,
the details of each BMP, included in the Appendix, provided specific maintenance instructions and
requirements. When a BMP is found to be ineffective in preventing discharge of pollutants, even though
the BMP is in good repair and is functioning as designed, that BMP shall be modified, or an alternative or
additional BMP shall be installed promptly.20
An Inspection Report will be maintained on-site and will include a record of all stormwater management
system inspections along with all BMP maintenance and repair activities21. All the inspection, maintenance,
and repair requirements for each BMP, as described in this SWMP and as outlined in the details or
specifications in the Appendix, will be performed as specified and will be recorded in the Inspection Log.
The Inspection Log will also include a description of any incidence of non-compliance, such as uncontrolled
releases of pollutants including mud, muddy water or measurable quantities of sediment found off the site
along with a description of measures to be taken to cleanup pollutants that have left the site and a
description of measures to be taken to prevent future pollutive discharges. Records of any spills, leaks, or
overflows of non-sediment potential pollutants, whether or not such a spill, leak, or overflow results in
pollution of stormwater, will be included.
Following an inspection that does not reveal any incidents of non-compliance, or following the completion
of measures taken to correct any non-compliance issues, a Certification indicating the site is in compliance
will be signed and dated.
In addition to regularly maintaining an Inspection Log and Certification, this SWMP will be updated regularly
to reflect the actual stormwater management system as implemented on the site.
19 (CDPHE-G, 2019), Section IV.5
20 (CDPHE-G, 2019), Section VII
21 (CDPHE-G, 2019), Section VI
10
JobNumber
11
Sources
CDPHE-G. (2019, April 1). State of Colorado Management Plan Guidance for Stormwater Discharge
Associated with Construction Activity. Denver: State of Colorado Department of Public Health
and Environment.
FIRM. (n.d.). Federal Emergency Management Agency. Retrieved from FEMA Flood Map Service Center:
https://msc.fema.gov/portal/home
MHFD. (2010). Mile High Flood District. Urban Drainage Criteria Manual, Volume 3, Stormwater Quality
(w/ 2019 updates). Colorado.
NRCS. (n.d.). National Resource Conservation Service. Official Soil Series Descriptions.
WSS. (n.d.). US Department of Agriculture, National Resource Conservation Service. Retrieved from NRCS
Web Soil Survey: https://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx
A
Appendix
Sample Field Inspection Sequence and Field Inspection Report
BMP Installation and Maintenance Details
The following list of sheets are from the BMP Details section from the Mile High Flood
Disctrict’s Volume 3. Details marked with an Asterisk (*) used with this plan.
Erosion Controls
EC-1 Surface Roughening (SR)
* EC-2 Temporary and Permanent Seeding (TS/PS)
EC-3 Soil Binders (SB)
* EC-4 Mulching (MU)
EC-5 Compost Blanket and Filter Berm (CB)
EC-6 Rolled Erosion Control Products (RECP) (multiple types)
EC-7 Temporary Slope Drains (TSD)
EC-8 Temporary Outlet Protection (TOP)
EC-9 Rough Cut Street Control (RCS)
EC-10 Earth Dikes and Drainage Swales (ED/DS)
EC-11 Terracing (TER)
EC-12 Check Dams (CD) (multiple types)
EC-13 Streambank Stabilization (SS)
EC-14 Wind Erosion / Dust Control (DC)
Materials Management
* MM-1 Concrete Washout Area (CWA)
* MM-2 Stockpile Management (SP) (multiple types)
* MM-3 Good Housekeeping Practices (GH)
Sediment Controls
* SC-1 Silt Fence (SF)
SC-2 Sediment Control Log (SCL)
SC-3 Straw Bale Barrier (SBB)
SC-4 Brush Barrier (BB)
SC-5 Rock Sock (RS)
SC-6 Inlet Protection (IP) (multiple types)
SC-7 Sediment Basin (SB)
SC-8 Sediment Trap (ST)
SC-9 Vegetative Buffers (VB)
SC-10 Chemical Treatment (CT)
Site Management and Other Specific Practices
SM-1 Construction Phasing/Sequencing (CP)
SM-2 Protection of Existing Vegetation (PV)
SM-3 Construction Fence (CF)
* SM-4 Vehicle Tracking Control (VTC) (multiple types)
SM-5 Stabilized Construction Roadway (SCR)
SM-6 Stabilized Staging Area (SSA)
SM-7 Street Sweeping and Vacuuming (SS)
SM-8 Temporary Diversion Methods (TDM)
SM-9 Dewatering Operations (DW)
SM-10 Temporary Stream Crossing (TSC) (multiple types)
SM-11 Temporary Batch Plant (TBP)
* SM-12 Paving and Grinding Operations (PGO)
Site Map (Grading, Erosion, and Stormwater Quality Plan)
31 |
Appendix D: Stormwater Inspection Report Template
Facility Name Permittee
Date of Inspection Weather Conditions
Permit Certification # Disturbed Acreage
Phase of Construction Inspector Title
Inspector Name
Is the above inspector a qualified stormwater manager?
(permittee is responsible for ensuring that the inspector is a qualified stormwater manager)
YES NO
INSPECTION FREQUENCY
Check the box that describes the minimum inspection frequency utilized when conducting each inspection
At least one inspection every 7 calendar days
At least one inspection every 14 calendar days, with post-storm event inspections conducted within
24 hours after the end of any precipitation or snowmelt event that causes surface erosions
This is this a post-storm event inspection. Event Date: _____________________
Reduced inspection frequency - Include site conditions that warrant reduced inspection frequency
Post-storm inspections at temporarily idle sites
Inspections at completed sites/area
Winter conditions exclusion
Have there been any deviations from the minimum inspection schedule?
If yes, describe below.
YES NO
INSPECTION REQUIREMENTS*
i. Visually verify all implemented control measures are in effective operational condition and are working as
designed in the specifications
ii. Determine if there are new potential sources of pollutants
iii. Assess the adequacy of control measures at the site to identify areas requiring new or modified control measures
to minimize pollutant discharges
iv. Identify all areas of non-compliance with the permit requirements, and if necessary, implement corrective action
*Use the attached Control Measures Requiring Routine Maintenance and Inadequate Control Measures
Requiring Corrective Action forms to document results of this assessment that trigger either maintenance or
corrective actions
AREAS TO BE INSPECTED
Is there evidence of, or the potential for, pollutants leaving the construction site boundaries, entering the stormwater
drainage system or discharging to state waters at the following locations?
NO YES
If "YES” describe discharge or potential for discharge below.
Document related maintenance, inadequate control measures
and corrective actions Inadequate Control Measures
Requiring Corrective Action form
Construction site perimeter
All disturbed areas
Designated haul routes
Material and waste storage areas
exposed to precipitation
Locations where stormwater has the
potential to discharge offsite
Locations where vehicles exit the site
Other: ____________________
CONTROL MEASURES REQUIRING ROUTINE MAINTENANCE
Definition: Any control measure that is still operating in accordance with its design and the requirements of the permit, but requires maintenance to prevent a
breach of the control measure. These items are not subject to the corrective action requirements as specified in Part I.B.1.c of the permit.
Are there control measures requiring maintenance?
NO YES
If “YES” document below
Date
Observed
Location Control Measure Maintenance Required
Date
Completed
INADEQUATE CONTROL MEASURES REQUIRING CORRECTIVE ACTION
Definition: Any control measure that is not designed or implemented in accordance with the requirements of the permit and/or any control measure that is not
implemented to operate in accordance with its design. This includes control measures that have not been implemented for pollutant sources. If it is infeasible
to install or repair the control measure immediately after discovering the deficiency the reason must be documented and a schedule included to return the
control measure to effective operating condition as possible.
Are there inadequate control measures requiring corrective action?
NO YES
If “YES” document
below
Are there additional control measures needed that were not in place at the time of
inspection?
NO YES
If “YES” document
below
Date
Discovered
Location
Description of Inadequate
Control Measure
Description of Corrective Action
Was deficiency corrected when
discovered? YES/NO
if “NO” provide reason and schedule to correct
Date
Corrected
REPORTING REQUIREMENTS
The permittee shall report the following circumstances orally within twenty-four (24) hours from the time the permittee becomes aware of the circumstances,
and shall mail to the division a written report containing the information requested within five (5) working days after becoming aware of the following
circumstances. The division may waive the written report required if the oral report has been received within 24 hours.
All Noncompliance Requiring 24-Hour Notification per Part II.L.6 of the Permit
a. Endangerment to Health or the Environment
Circumstances leading to any noncompliance which may endanger health or the environment regardless of the cause of the incident (See Part II.L.6.a
of the Permit)
This category would primarily result from the discharge of pollutants in violation of the permit
b. Numeric Effluent Limit Violations
o Circumstances leading to any unanticipated bypass which exceeds any effluent limitations (See Part II.L.6.b of the Permit)
o Circumstances leading to any upset which causes an exceedance of any effluent limitation (See Part II.L.6.c of the Permit)
o Daily maximum violations (See Part II.L.6.d of the Permit)
Numeric effluent limits are very uncommon in certifications under the COR400000 general permit. This category of noncompliance only applies if
numeric effluent limits are included in a permit certification.
Has there been an incident of noncompliance requiring 24-hour notification?
NO YES
If “YES” document
below
Date and
Time of
Incident
Location
Description of
Noncompliance
Description of Corrective Action
Date and Time of
24 Hour Oral
Notification
Date of 5 Day Written
Notification *
*Attach copy of 5 day written notification to report. Indicate if written notification was waived, including the name of the division personnel who granted waiver.
After adequate corrective action(s) and maintenance have been taken, or where a
report does not identify any incidents requiring corrective action or maintenance, the
individual(s) designated as the Qualified Stormwater Manager, shall sign and certify the
below statement:
“I verify that, to the best of my knowledge and belief, all corrective action and
maintenance items identified during the inspection are complete, and the site is
currently in compliance with the permit.”
_________________________________ ____________________________________
Name of Qualified Stormwater Manager Title of Qualified Stormwater Manager
_________________________________ _____________________________________
Signature of Qualified Stormwater Manager Date
Notes/Comments
Temporary and Permanent Seeding (TS/PS) EC-2
June 2012 Urban Drainage and Flood Control District TS/PS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TS/PS -1. Equipment used to drill seed. Photo courtesy of
Douglas County.
Description
Temporary seeding can be used to
stabilize disturbed areas that will be
inactive for an extended period.
Permanent seeding should be used to
stabilize areas at final grade that will not
be otherwise stabilized. Effective seeding
includes preparation of a seedbed,
selection of an appropriate seed mixture,
proper planting techniques, and protection
of the seeded area with mulch, geotextiles,
or other appropriate measures.
Appropriate Uses
When the soil surface is disturbed and
will remain inactive for an extended
period (typically 30 days or longer),
proactive stabilization measures should be implemented. If the inactive period is short-lived (on the order
of two weeks), techniques such as surface roughening may be appropriate. For longer periods of
inactivity, temporary seeding and mulching can provide effective erosion control. Permanent seeding
should be used on finished areas that have not been otherwise stabilized.
Typically, local governments have their own seed mixes and timelines for seeding. Check jurisdictional
requirements for seeding and temporary stabilization.
Design and Installation
Effective seeding requires proper seedbed preparation, selection of an appropriate seed mixture, use of
appropriate seeding equipment to ensure proper coverage and density, and protection with mulch or fabric
until plants are established.
The USDCM Volume 2 Revegetation Chapter contains detailed seed mix, soil preparations, and seeding
and mulching recommendations that may be referenced to supplement this Fact Sheet.
Drill seeding is the preferred seeding method. Hydroseeding is not recommended except in areas where
steep slopes prevent use of drill seeding equipment, and even in these instances it is preferable to hand
seed and mulch. Some jurisdictions do not allow hydroseeding or hydromulching.
Seedbed Preparation
Prior to seeding, ensure that areas to be revegetated have
soil conditions capable of supporting vegetation. Overlot
grading can result in loss of topsoil, resulting in poor quality
subsoils at the ground surface that have low nutrient value,
little organic matter content, few soil microorganisms,
rooting restrictions, and conditions less conducive to
infiltration of precipitation. As a result, it is typically
necessary to provide stockpiled topsoil, compost, or other
Temporary and Permanent Seeding
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-2 Urban Drainage and Flood Control District June 2012
Urban Storm Drainage Criteria Manual Volume 3
soil amendments and rototill them into the soil to a depth of 6 inches or more.
Topsoil should be salvaged during grading operations for use and spread on areas to be revegetated later.
Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its
water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content.
The rooting depth of most native grasses in the semi-arid Denver metropolitan area is 6 to 18 inches. At a
minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately respread across
areas that will be revegetated.
Where topsoil is not available, subsoils should be amended to provide an appropriate plant-growth
medium. Organic matter, such as well digested compost, can be added to improve soil characteristics
conducive to plant growth. Other treatments can be used to adjust soil pH conditions when needed. Soil
testing, which is typically inexpensive, should be completed to determine and optimize the types and
amounts of amendments that are required.
If the disturbed ground surface is compacted, rip or rototill the surface prior to placing topsoil. If adding
compost to the existing soil surface, rototilling is necessary. Surface roughening will assist in placement
of a stable topsoil layer on steeper slopes, and allow infiltration and root penetration to greater depth.
Prior to seeding, the soil surface should be rough and the seedbed should be firm, but neither too loose
nor compacted. The upper layer of soil should be in a condition suitable for seeding at the proper depth
and conducive to plant growth. Seed-to-soil contact is the key to good germination.
Seed Mix for Temporary Vegetation
To provide temporary vegetative cover on disturbed areas which will not be paved, built upon, or fully
landscaped or worked for an extended period (typically 30 days or more), plant an annual grass
appropriate for the time of planting and mulch the planted areas. Annual grasses suitable for the Denver
metropolitan area are listed in Table TS/PS-1. These are to be considered only as general
recommendations when specific design guidance for a particular site is not available. Local governments
typically specify seed mixes appropriate for their jurisdiction.
Seed Mix for Permanent Revegetation
To provide vegetative cover on disturbed areas that have reached final grade, a perennial grass mix should
be established. Permanent seeding should be performed promptly (typically within 14 days) after
reaching final grade. Each site will have different characteristics and a landscape professional or the local
jurisdiction should be contacted to determine the most suitable seed mix for a specific site. In lieu of a
specific recommendation, one of the perennial grass mixes appropriate for site conditions and growth
season listed in Table TS/PS-2 can be used. The pure live seed (PLS) rates of application recommended
in these tables are considered to be absolute minimum rates for seed applied using proper drill-seeding
equipment.
If desired for wildlife habitat or landscape diversity, shrubs such as rubber rabbitbrush (Chrysothamnus
nauseosus), fourwing saltbush (Atriplex canescens) and skunkbrush sumac (Rhus trilobata) could be
added to the upland seedmixes at 0.25, 0.5 and 1 pound PLS/acre, respectively. In riparian zones,
planting root stock of such species as American plum (Prunus americana), woods rose (Rosa woodsii),
plains cottonwood (Populus sargentii), and willow (Populus spp.) may be considered. On non-topsoiled
upland sites, a legume such as Ladak alfalfa at 1 pound PLS/acre can be included as a source of nitrogen
for perennial grasses.
Temporary and Permanent Seeding (TS/PS) EC-2
June 2012 Urban Drainage and Flood Control District TS/PS-3
Urban Storm Drainage Criteria Manual Volume 3
Seeding dates for the highest success probability of perennial species along the Front Range are generally
in the spring from April through early May and in the fall after the first of September until the ground
freezes. If the area is irrigated, seeding may occur in summer months, as well. See Table TS/PS-3 for
appropriate seeding dates.
Table TS/PS-1. Minimum Drill Seeding Rates for Various Temporary Annual Grasses
Speciesa
(Common name)
Growth
Seasonb
Pounds of
Pure Live Seed
(PLS)/acrec
Planting
Depth
(inches)
1. Oats Cool 35 - 50 1 - 2
2. Spring wheat Cool 25 - 35 1 - 2
3. Spring barley Cool 25 - 35 1 - 2
4. Annual ryegrass Cool 10 - 15 ½
5. Millet Warm 3 - 15 ½ - ¾
6. Sudangrass Warm 5–10 ½ - ¾
7. Sorghum Warm 5–10 ½ - ¾
8. Winter wheat Cool 20–35 1 - 2
9. Winter barley Cool 20–35 1 - 2
10. Winter rye Cool 20–35 1 - 2
11. Triticale Cool 25–40 1 - 2
a Successful seeding of annual grass resulting in adequate plant growth will
usually produce enough dead-plant residue to provide protection from
wind and water erosion for an additional year. This assumes that the cover
is not disturbed or mowed closer than 8 inches.
Hydraulic seeding may be substituted for drilling only where slopes are
steeper than 3:1 or where access limitations exist. When hydraulic
seeding is used, hydraulic mulching should be applied as a separate
operation, when practical, to prevent the seeds from being encapsulated in
the mulch.
b See Table TS/PS-3 for seeding dates. Irrigation, if consistently applied,
may extend the use of cool season species during the summer months.
c Seeding rates should be doubled if seed is broadcast, or increased by 50
percent if done using a Brillion Drill or by hydraulic seeding.
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-4 Urban Drainage and Flood Control District June 2012
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses
Common
a
Name
Botanical
Name
Growth
Seasonb
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Alakali Soil Seed Mix
Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25
Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Jose tall wheatgrass Agropyron elongatum 'Jose' Cool Bunch 79,000 7.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.75
Fertile Loamy Soil Seed Mix
Ephriam crested wheatgrass Agropyron cristatum
'Ephriam' Cool Sod 175,000 2.0
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 7.0
Total 15.5
High Water Table Soil Seed Mix
Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5
Redtop Agrostis alba Warm Open sod 5,000,000 0.25
Reed canarygrass Phalaris arundinacea Cool Sod 68,000 0.5
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Pathfinder switchgrass Panicum virgatum
'Pathfinder' Warm Sod 389,000 1.0
Alkar tall wheatgrass Agropyron elongatum
'Alkar' Cool Bunch 79,000 5.5
Total 10.75
Transition Turf Seed Mixc
Ruebens Canadian bluegrass Poa compressa 'Ruebens' Cool Sod 2,500,000 0.5
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Citation perennial ryegrass Lolium perenne 'Citation' Cool Sod 247,000 3.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Total 7.5
Temporary and Permanent Seeding (TS/PS) EC-2
June 2012 Urban Drainage and Flood Control District TS/PS-5
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses (cont.)
Common
Name
Botanical
Name
Growth
Seasonb
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Sandy Soil Seed Mix
Blue grama Bouteloua gracilis Warm Sod-forming
bunchgrass 825,000 0.5
Camper little bluestem Schizachyrium scoparium
'Camper' Warm Bunch 240,000 1.0
Prairie sandreed Calamovilfa longifolia Warm Open sod 274,000 1.0
Sand dropseed Sporobolus cryptandrus Cool Bunch 5,298,000 0.25
Vaughn sideoats grama Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 10.25
Heavy Clay, Rocky Foothill Seed Mix
Ephriam crested wheatgrass
d
Agropyron cristatum
'Ephriam' Cool Sod 175,000 1.5
Oahe Intermediate wheatgrass Agropyron intermedium
'Oahe' Cool Sod 115,000 5.5
Vaughn sideoats grama
e
Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.5
a All of the above seeding mixes and rates are based on drill seeding followed by crimped straw mulch. These rates should be
doubled if seed is broadcast and should be increased by 50 percent if the seeding is done using a Brillion Drill or is applied
through hydraulic seeding. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1. If
hydraulic seeding is used, hydraulic mulching should be done as a separate operation.
b
See Table TS/PS-3 for seeding dates.
c
If site is to be irrigated, the transition turf seed rates should be doubled.
d
Crested wheatgrass should not be used on slopes steeper than 6H to 1V.
e
Can substitute 0.5 lbs PLS of blue grama for the 2.0 lbs PLS of Vaughn sideoats grama.
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-6 Urban Drainage and Flood Control District June 2012
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-3. Seeding Dates for Annual and Perennial Grasses
Annual Grasses
(Numbers in table reference
species in Table TS/PS-1)
Perennial Grasses
Seeding Dates Warm Cool Warm Cool
January 1–March 15
March 16–April 30 4 1,2,3
May 1–May 15 4
May 16–June 30 4,5,6,7
July 1–July 15 5,6,7
July 16–August 31
September 1–September 30 8,9,10,11
October 1–December 31
Mulch
Cover seeded areas with mulch or an appropriate rolled erosion control product to promote establishment
of vegetation. Anchor mulch by crimping, netting or use of a non-toxic tackifier. See the Mulching BMP
Fact Sheet for additional guidance.
Maintenance and Removal
Monitor and observe seeded areas to identify areas of poor growth or areas that fail to germinate. Reseed
and mulch these areas, as needed.
An area that has been permanently seeded should have a good stand of vegetation within one growing
season if irrigated and within three growing seasons without irrigation in Colorado. Reseed portions of
the site that fail to germinate or remain bare after the first growing season.
Seeded areas may require irrigation, particularly during extended dry periods. Targeted weed control may
also be necessary.
Protect seeded areas from construction equipment and vehicle access.
Mulching (MU) EC-4
June 2012 Urban Drainage and Flood Control District MU-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph MU-1. An area that was recently seeded, mulched,
and crimped.
Description
Mulching consists of evenly applying
straw, hay, shredded wood mulch, rock,
bark or compost to disturbed soils and
securing the mulch by crimping, tackifiers,
netting or other measures. Mulching helps
reduce erosion by protecting bare soil
from rainfall impact, increasing
infiltration, and reducing runoff.
Although often applied in conjunction
with temporary or permanent seeding, it
can also be used for temporary
stabilization of areas that cannot be
reseeded due to seasonal constraints.
Mulch can be applied either using
standard mechanical dry application
methods or using hydromulching equipment
that hydraulically applies a slurry of water,
wood fiber mulch, and often a tackifier.
Appropriate Uses
Use mulch in conjunction with seeding to help protect the seedbed and stabilize the soil. Mulch can also
be used as a temporary cover on low to mild slopes to help temporarily stabilize disturbed areas where
growing season constraints prevent effective reseeding. Disturbed areas should be properly mulched and
tacked, or seeded, mulched and tacked promptly after final grade is reached (typically within no longer
than 14 days) on portions of the site not otherwise permanently stabilized.
Standard dry mulching is encouraged in most jurisdictions; however, hydromulching may not be allowed
in certain jurisdictions or may not be allowed near waterways.
Do not apply mulch during windy conditions.
Design and Installation
Prior to mulching, surface-roughen areas by rolling with a crimping or punching type roller or by track
walking. Track walking should only be used where other methods are impractical because track walking
with heavy equipment typically compacts the soil.
A variety of mulches can be used effectively at construction
sites. Consider the following:
Mulch
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-4 Mulching (MU)
MU-2 Urban Drainage and Flood Control District June 2012
Urban Storm Drainage Criteria Manual Volume 3
Clean, weed-free and seed-free cereal grain straw should be applied evenly at a rate of 2 tons per acre and
must be tacked or fastened by a method suitable for the condition of the site. Straw mulch must be
anchored (and not merely placed) on the surface. This can be accomplished mechanically by crimping or
with the aid of tackifiers or nets. Anchoring with a crimping implement is preferred, and is the
recommended method for areas flatter than 3:1. Mechanical crimpers must be capable of tucking the long
mulch fibers into the soil to a depth of 3 inches without cutting them. An agricultural disk, while not an
ideal substitute, may work if the disk blades are dull or blunted and set vertically; however, the frame may
have to be weighted to afford proper soil penetration.
Grass hay may be used in place of straw; however, because hay is comprised of the entire plant including
seed, mulching with hay may seed the site with non-native grass species which might in turn out-compete
the native seed. Alternatively, native species of grass hay may be purchased, but can be difficult to find
and are more expensive than straw. Purchasing and utilizing a certified weed-free straw is an easier and
less costly mulching method. When using grass hay, follow the same guidelines as for straw (provided
above).
On small areas sheltered from the wind and heavy runoff, spraying a tackifier on the mulch is satisfactory
for holding it in place. For steep slopes and special situations where greater control is needed, erosion
control blankets anchored with stakes should be used instead of mulch.
Hydraulic mulching consists of wood cellulose fibers mixed with water and a tackifying agent and should
be applied at a rate of no less than 1,500 pounds per acre (1,425 lbs of fibers mixed with at least 75 lbs of
tackifier) with a hydraulic mulcher. For steeper slopes, up to 2000 pounds per acre may be required for
effective hydroseeding. Hydromulch typically requires up to 24 hours to dry; therefore, it should not be
applied immediately prior to inclement weather. Application to roads, waterways and existing vegetation
should be avoided.
Erosion control mats, blankets, or nets are recommended to help stabilize steep slopes (generally 3:1 and
steeper) and waterways. Depending on the product, these may be used alone or in conjunction with grass
or straw mulch. Normally, use of these products will be restricted to relatively small areas.
Biodegradable mats made of straw and jute, straw-coconut, coconut fiber, or excelsior can be used instead
of mulch. (See the ECM/TRM BMP for more information.)
Some tackifiers or binders may be used to anchor mulch. Check with the local jurisdiction for allowed
tackifiers. Manufacturer's recommendations should be followed at all times. (See the Soil Binder BMP
for more information on general types of tackifiers.)
Rock can also be used as mulch. It provides protection of exposed soils to wind and water erosion and
allows infiltration of precipitation. An aggregate base course can be spread on disturbed areas for
temporary or permanent stabilization. The rock mulch layer should be thick enough to provide full
coverage of exposed soil on the area it is applied.
Maintenance and Removal
After mulching, the bare ground surface should not be more than 10 percent exposed. Reapply mulch, as
needed, to cover bare areas.
Concrete Washout Area (CWA) MM-1
November 2010 Urban Drainage and Flood Control District CWA-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CWA-1. Example of concrete washout area. Note gravel
tracking pad for access and sign.
Description
Concrete waste management involves
designating and properly managing a
specific area of the construction site as a
concrete washout area. A concrete
washout area can be created using one of
several approaches 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. Three basic
approaches are available: excavation of a
pit in the ground, use of an above ground
storage area, or use of prefabricated haul-
away concrete washout containers.
Surface discharges of concrete washout
water from construction sites are prohibited.
Appropriate Uses
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.
Because pH is a pollutant of concern for washout activities, when unlined pits are used for concrete
washout, the soil must have adequate buffering capacity to result in protection of state groundwater
standards; otherwise, a liner/containment must be used. The following management practices are
recommended to prevent an impact from unlined pits to groundwater:
The use of the washout site should be temporary (less than 1 year), and
The washout site should be not be located in an area where shallow groundwater may be present, such
as near natural drainages, springs, or wetlands.
Design and Installation
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.
Although unlined washout areas may be used, lined pits may be required to protect groundwater under
certain conditions.
Do not locate an unlined washout area within 400 feet
of any natural drainage pathway or waterbody or
within 1,000 feet of any wells or drinking water
sources. Even for lined concrete washouts, it is
advisable to locate the facility away from waterbodies
and drainage paths. If site constraints make these
Concrete Washout Area
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
MM-1 Concrete Washout Area (CWA)
CWA-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
setbacks infeasible or if highly permeable soils exist in the area, then the pit must be installed with an
impermeable liner (16 mil minimum thickness) or surface storage alternatives using prefabricated
concrete washout devices or a lined aboveground storage area should be used.
Design details with notes are provided in Detail CWA-1 for pits and CWA-2 for aboveground storage
areas. Pre-fabricated concrete washout container information can be obtained from vendors.
Maintenance and Removal
A key consideration for concrete washout areas is to ensure that adequate signage is in place identifying
the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that
adequate signage is provided and in good repair and that the washout area is being used, as opposed to
washout in non-designated areas of the site.
Remove concrete waste in the washout area, as needed to maintain BMP function (typically when filled to
about two-thirds of its capacity). Collect concrete waste and deliver offsite to a designated disposal
location.
Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any
contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. If the wash
water is allowed to evaporate and the concrete hardens, it may be recycled.
Photograph CWA-3. Earthen concrete washout. Photo
courtesy of CDOT.
Photograph CWA-2. Prefabricated concrete washout. Photo
courtesy of CDOT.
Concrete Washout Area (CWA) MM-1
November 2010 Urban Drainage and Flood Control District CWA-3
Urban Storm Drainage Criteria Manual Volume 3
MM-1 Concrete Washout Area (CWA)
CWA-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SP-1. A topsoil stockpile that has been partially
revegetated and is protected by silt fence perimeter control.
Description
Stockpile management includes
measures to minimize erosion and
sediment transport from soil stockpiles.
Appropriate Uses
Stockpile management should be used
when soils or other erodible materials
are stored at the construction site.
Special attention should be given to
stockpiles in close proximity to natural
or manmade storm systems.
Design and Installation
Locate stockpiles away from all drainage system components including storm sewer inlets. Where
practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the
phases of construction progress. Place sediment control BMPs around the perimeter of the stockpile, such
as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for guidance
on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a
stabilized designated access point on the upgradient side of the stockpile.
Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control
blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should
be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14
days). Use of mulch only or a soil binder is acceptable if the stockpile will be in place for a more limited
time period (typically 30-60 days). Timeframes for stabilization of stockpiles noted in this fact sheet are
"typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that
may be more prescriptive.
Stockpiles should not be placed in streets or paved areas unless no other practical alternative exists. See
the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to
space or right-of-way constraints. For paved areas, rock socks must be used for perimeter control and all
inlets with the potential to receive sediment from the stockpile (even from vehicle tracking) must be
protected.
Maintenance and Removal
Inspect perimeter controls and inlet protection in accordance with their respective BMP Fact Sheets.
Where seeding, mulch and/or soil binders are used, reseeding or reapplication of soil binder may be
necessary.
When temporary removal of a perimeter BMP is necessary
to access a stockpile, ensure BMPs are reinstalled in
accordance with their respective design detail section.
Stockpile Management
Functions
Erosion Control Yes
Sediment Control Yes
Site/Material Management Yes
MM-2 Stockpile Management (SM)
SP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
When the stockpile is no longer needed, properly dispose of excess materials and revegetate or otherwise
stabilize the ground surface where the stockpile was located.
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-3
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM)
SP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-5
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM)
SP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-1
Urban Storm Drainage Criteria Manual Volume 3
Photographs GH-1 and GH-2. Proper materials
storage and secondary containment for fuel tanks
are important good housekeeping practices. Photos
courtesy of CDOT and City of Aurora.
Description
Implement construction site good housekeeping practices to
prevent pollution associated with solid, liquid and hazardous
construction-related materials and wastes. Stormwater
Management Plans (SWMPs) should clearly specify BMPs
including these good housekeeping practices:
Provide for waste management.
Establish proper building material staging areas.
Designate paint and concrete washout areas.
Establish proper equipment/vehicle fueling and
maintenance practices.
Control equipment/vehicle washing and allowable non-
stormwater discharges.
Develop a spill prevention and response plan.
Acknowledgement: This Fact Sheet is based directly on
EPA guidance provided in Developing Your Stormwater
Pollution Prevent Plan (EPA 2007).
Appropriate Uses
Good housekeeping practices are necessary at all construction sites.
Design and Installation
The following principles and actions should be addressed in SWMPs:
Provide for Waste Management. Implement management procedures and practices to prevent or
reduce the exposure and transport of pollutants in stormwater from solid, liquid and sanitary wastes
that will be generated at the site. Practices such as trash disposal, recycling, proper material handling,
and cleanup measures can reduce the potential for stormwater runoff to pick up construction site
wastes and discharge them to surface waters. Implement a comprehensive set of waste-management
practices for hazardous or toxic materials, such as paints, solvents, petroleum products, pesticides,
wood preservatives, acids, roofing tar, and other materials. Practices should include storage,
handling, inventory, and cleanup procedures, in case of spills. Specific practices that should be
considered include:
Solid or Construction Waste
o Designate trash and bulk waste-collection areas on-
site.
Good Housekeeping
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
MM-3 Good Housekeeping Practices (GH)
GH-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph GH-3. Locate portable toilet facilities on level
surfaces away from waterways and storm drains. Photo
courtesy of WWE.
o Recycle materials whenever possible (e.g., paper, wood, concrete, oil).
o Segregate and provide proper disposal options for hazardous material wastes.
o Clean up litter and debris from the construction site daily.
o 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.
o Empty waste containers before they are full and overflowing.
Sanitary and Septic Waste
o Provide convenient, well-maintained, and properly located toilet facilities on-site.
o Locate toilet facilities away from storm drain inlets and waterways to prevent accidental spills
and contamination of stormwater.
o Maintain clean restroom facilities and empty portable toilets regularly.
o Where possible, provide secondary containment pans under portable toilets.
o Provide tie-downs or stake-downs for portable toilets.
o Educate employees, subcontractors, and suppliers on locations of facilities.
o Treat or dispose of sanitary and septic waste in accordance with state or local regulations. Do not
discharge or bury wastewater at the construction site.
o Inspect facilities for leaks. If found, repair or replace immediately.
o Special care is necessary during maintenance (pump out) to ensure that waste and/or biocide are
not spilled on the ground.
Hazardous Materials and Wastes
o Develop and implement employee and
subcontractor education, as needed, on
hazardous and toxic waste handling,
storage, disposal, and cleanup.
o Designate hazardous waste-collection
areas on-site.
o Place all hazardous and toxic material
wastes in secondary containment.
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-3
Urban Storm Drainage Criteria Manual Volume 3
o Hazardous waste containers should be inspected to ensure that all containers are labeled properly
and that no leaks are present.
Establish Proper Building Material Handling and Staging Areas. The SWMP should include
comprehensive handling and management procedures for building materials, especially those that are
hazardous or toxic. Paints, solvents, pesticides, fuels and oils, other hazardous materials or building
materials that have the potential to contaminate stormwater should be stored indoors or under cover
whenever possible or in areas with secondary containment. Secondary containment measures prevent
a spill from spreading across the site and may include dikes, berms, curbing, or other containment
methods. Secondary containment techniques should also ensure the protection of groundwater.
Designate staging areas for activities such as fueling vehicles, mixing paints, plaster, mortar, and
other potential pollutants. Designated staging areas enable easier monitoring of the use of materials
and clean up of spills. Training employees and subcontractors is essential to the success of this
pollution prevention principle. Consider the following specific materials handling and staging
practices:
o Train employees and subcontractors in proper handling and storage practices.
o Clearly designate site areas for staging and storage with signs and on construction drawings.
Staging areas should be located in areas central to the construction site. Segment the staging area
into sub-areas designated for vehicles, equipment, or stockpiles. Construction entrances and exits
should be clearly marked so that delivery vehicles enter/exit through stabilized areas with vehicle
tracking controls (See Vehicle Tracking Control Fact Sheet).
o 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.
o Ensure that storage containers are regularly inspected for leaks, corrosion, support or foundation
failure, or other signs of deterioration and tested for soundness.
o Reuse and recycle construction materials when possible.
Designate Concrete Washout Areas. Concrete contractors should be encouraged to use the washout
facilities at their own plants or dispatch facilities when feasible; however, concrete washout
commonly occurs on construction sites. If it is necessary to provide for concrete washout areas on-
site, designate specific washout areas and design facilities to handle anticipated washout water.
Washout areas should also be provided for paint and stucco operations. Because washout areas can
be a source of pollutants from leaks or spills, care must be taken with regard to their placement and
proper use. See the Concrete Washout Area Fact Sheet for detailed guidance.
Both self-constructed and prefabricated washout containers can fill up quickly when concrete, paint,
and stucco work are occurring on large portions of the site. Be sure to check for evidence that
contractors are using the washout areas and not dumping materials onto the ground or into drainage
facilities. If the washout areas are not being used regularly, consider posting additional signage,
relocating the facilities to more convenient locations, or providing training to workers and
contractors.
When concrete, paint, or stucco is part of the construction process, consider these practices which will
help prevent contamination of stormwater. Include the locations of these areas and the maintenance
and inspection procedures in the SWMP.
MM-3 Good Housekeeping Practices (GH)
GH-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
o Do not washout concrete trucks or equipment into storm drains, streets, gutters, uncontained
areas, or streams. Only use designated washout areas.
o Establish washout areas and advertise their locations with signs. Ensure that signage remains in
good repair.
o Provide adequate containment for the amount of wash water that will be used.
o Inspect washout structures daily to detect leaks or tears and to identify when materials need to be
removed.
o Dispose of materials properly. The preferred method is to allow the water to evaporate and to
recycle the hardened concrete. Full service companies may provide dewatering services and
should dispose of wastewater properly. Concrete wash water can be highly polluted. It should
not be discharged to any surface water, storm sewer system, or allowed to infiltrate into the
ground in the vicinity of waterbodies. Washwater should not be discharged to a sanitary sewer
system without first receiving written permission from the system operator.
Establish Proper Equipment/Vehicle Fueling and Maintenance Practices. Create a clearly
designated on-site fueling and maintenance area that is clean and dry. The on-site fueling area should
have a spill kit, and staff should know how to use it. If possible, conduct vehicle fueling and
maintenance activities in a covered area. Consider the following practices to help prevent the
discharge of pollutants to stormwater from equipment/vehicle fueling and maintenance. Include the
locations of designated fueling and maintenance areas and inspection and maintenance procedures in
the SWMP.
o Train employees and subcontractors in proper fueling procedures (stay with vehicles during
fueling, proper use of pumps, emergency shutoff valves, etc.).
o Inspect on-site vehicles and equipment regularly for leaks, equipment damage, and other service
problems.
o Clearly designate vehicle/equipment service areas away from drainage facilities and watercourses
to prevent stormwater run-on and runoff.
o Use drip pans, drip cloths, or absorbent pads when replacing spent fluids.
o Collect all spent fluids, store in appropriate labeled containers in the proper storage areas, and
recycle fluids whenever possible.
Control Equipment/Vehicle Washing and Allowable Non-Stormwater Discharges. Implement
practices to prevent contamination of surface and groundwater from equipment and vehicle wash
water. Representative practices include:
o Educate employees and subcontractors on proper washing procedures.
o Use off-site washing facilities, when available.
o Clearly mark the washing areas and inform workers that all washing must occur in this area.
o Contain wash water and treat it using BMPs. Infiltrate washwater when possible, but maintain
separation from drainage paths and waterbodies.
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-5
Urban Storm Drainage Criteria Manual Volume 3
o Use high-pressure water spray at vehicle washing facilities without detergents. Water alone can
remove most dirt adequately.
o Do not conduct other activities, such as vehicle repairs, in the wash area.
o Include the location of the washing facilities and the inspection and maintenance procedures in
the SWMP.
Develop a Spill Prevention and Response Plan. Spill prevention and response procedures must be
identified in the SWMP. Representative procedures include identifying ways to reduce the chance of
spills, stop the source of spills, contain and clean up spills, dispose of materials contaminated by
spills, and train personnel responsible for spill prevention and response. The plan should also specify
material handling procedures and storage requirements and ensure that clear and concise spill cleanup
procedures are provided and posted for areas in which spills may potentially occur. When developing
a spill prevention plan, include the following:
o Note the locations of chemical storage areas, storm drains, tributary drainage areas, surface
waterbodies on or near the site, and measures to stop spills from leaving the site.
o Provide proper handling and safety procedures for each type of waste. Keep Material Safety Data
Sheets (MSDSs) for chemical used on site with the SWMP.
o Establish an education program for employees and subcontractors on the potential hazards to
humans and the environment from spills and leaks.
o Specify how to notify appropriate authorities, such as police and fire departments, hospitals, or
municipal sewage treatment facilities to request assistance. Emergency procedures and contact
numbers should be provided in the SWMP and posted at storage locations.
o Describe the procedures, equipment and materials for immediate cleanup of spills and proper
disposal.
o Identify personnel responsible for implementing the plan in the event of a spill. Update the spill
prevention plan and clean up materials as changes occur to the types of chemicals stored and used
at the facility.
MM-3 Good Housekeeping Practices (GH)
GH-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Spill Prevention, Control, and Countermeasure (SPCC) Plan
Construction sites may be subject to 40 CFR Part 112 regulations that require the preparation and
implementation of a SPCC Plan to prevent oil spills from aboveground and underground storage tanks.
The facility is subject to this rule if it is a non-transportation-related facility that:
Has a total storage capacity greater than 1,320 gallons or a completely buried storage capacity
greater than 42,000 gallons.
Could reasonably be expected to discharge oil in quantities that may be harmful to navigable waters
of the United States and adjoining shorelines.
Furthermore, if the facility is subject to 40 CFR Part 112, the SWMP should reference the SPCC Plan.
To find out more about SPCC Plans, see EPA's website on SPPC at www.epa.gov/oilspill/spcc.htm.
Reporting Oil Spills
In the event of an oil spill, contact the National Response Center toll free at 1-800-424- 8802 for
assistance, or for more details, visit their website: www.nrc.uscg.mil.
Maintenance and Removal
Effective implementation of good housekeeping practices is dependent on clear designation of personnel
responsible for supervising and implementing good housekeeping programs, such as site cleanup and
disposal of trash and debris, hazardous material management and disposal, vehicle and equipment
maintenance, and other practices. Emergency response "drills" may aid in emergency preparedness.
Checklists may be helpful in good housekeeping efforts.
Staging and storage areas require permanent stabilization when the areas are no longer being used for
construction-related activities.
Construction-related materials, debris and waste must be removed from the construction site once
construction is complete.
Design Details
See the following Fact Sheets for related Design Details:
MM-1 Concrete Washout Area
MM-2 Stockpile Management
SM-4 Vehicle Tracking Control
Design details are not necessary for other good housekeeping practices; however, be sure to designate
where specific practices will occur on the appropriate construction drawings.
Silt Fence (SF) SC-1
November 2010 Urban Drainage and Flood Control District SF-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SF-1. Silt fence creates a sediment barrier, forcing
sheet flow runoff to evaporate or infiltrate.
Description
A silt fence is a woven geotextile fabric
attached to wooden posts and trenched
into the ground. It is designed as a
sediment barrier to intercept sheet flow
runoff from disturbed areas.
Appropriate Uses
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.
At the perimeter of a construction site.
Design and Installation
Silt fence should be installed along the contour of slopes so that it intercepts sheet flow. The maximum
recommended tributary drainage area per 100 lineal feet of silt fence, installed along the contour, is
approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no
steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only
applies to silt fence installed along the contour. Silt fence installed for other uses, such as perimeter
control, should be installed in a way that will not produce concentrated flows. For example, a "J-hook"
installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather
than concentrate and cause erosive conditions parallel to the silt fence.
See Detail SF-1 for proper silt fence installation, which involves proper trenching, staking, securing the
fabric to the stakes, and backfilling the silt fence. Properly installed silt fence should not be easily pulled
out by hand and there should be no gaps between the ground and the fabric.
Silt fence must meet the minimum allowable strength requirements, depth of installation requirement, and
other specifications in the design details. Improper installation
of silt fence is a common reason for silt fence failure; however,
when properly installed and used for the appropriate purposes, it
can be highly effective.
Silt Fence
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-1 Silt Fence (SF)
SF-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph SF-2. When silt fence is not installed along
the contour, a "J-hook" installation may be appropriate
to ensure that the BMP does not create concentrated
flow parallel to the silt fence. Photo courtesy of Tom
Gore.
Maintenance and Removal
Inspection of silt fence includes observing the
material for tears or holes and checking for slumping
fence and undercut areas bypassing flows. Repair of
silt fence typically involves replacing the damaged
section with a new section. Sediment accumulated
behind silt fence should be removed, as needed to
maintain BMP effectiveness, typically before it
reaches a depth of 6 inches.
Silt fence may be removed when the upstream area
has reached final stabilization.
Silt Fence (SF) SC-1
November 2010 Urban Drainage and Flood Control District SF-3
Urban Storm Drainage Criteria Manual Volume 3
SC-1 Silt Fence (SF)
SF-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph VTC-1. A vehicle tracking control pad constructed with
properly sized rock reduces off-site sediment tracking.
Description
Vehicle tracking controls provide
stabilized construction site access where
vehicles exit the site onto paved public
roads. An effective vehicle tracking
control helps remove sediment (mud or
dirt) from vehicles, reducing tracking onto
the paved surface.
Appropriate Uses
Implement a stabilized construction
entrance or vehicle tracking control where
frequent heavy vehicle traffic exits the
construction site onto a paved roadway. An
effective vehicle tracking control is
particularly important during the following conditions:
Wet weather periods when mud is easily tracked off site.
During dry weather periods where dust is a concern.
When poorly drained, clayey soils are present on site.
Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at
particularly muddy sites.
Design and Installation
Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control
towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction
vehicles to the designated exit through the vehicle tracking control. There are several different types of
stabilized construction entrances including:
VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a
geotextile. This is the most common vehicle tracking control, and when properly maintained can be
effective at removing sediment from vehicle tires.
VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of
control may be appropriate for site access at very small construction sites with low traffic volume over
vegetated areas. Although this application does not typically remove sediment from vehicles, it helps
protect existing vegetation and provides a stabilized entrance.
Vehicle Tracking Control
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management Yes
SM-4 Vehicle Tracking Control (VTC)
VTC-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph VTC-2. A vehicle tracking control pad with wheel wash
facility. Photo courtesy of Tom Gore.
VTC-3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar
to VTC-1, but includes equipment for tire washing. The wheel wash equipment may be as simple as
hand-held power washing equipment to more advance proprietary systems. When a wheel wash is
provided, it is important to direct wash water to a sediment trap prior to discharge from the site.
Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff.
Maintenance and Removal
Inspect the area for degradation and
replace aggregate or material used for a
stabilized entrance/exit as needed. If the
area becomes clogged and ponds water,
remove and dispose of excess sediment
or replace material with a fresh layer of
aggregate as necessary.
With aggregate vehicle tracking controls,
ensure rock and debris from this area do
not enter the public right-of-way.
Remove sediment that is tracked onto the
public right of way daily or more
frequently as needed. Excess sediment
in the roadway indicates that the
stabilized construction entrance needs
maintenance.
Ensure that drainage ditches at the
entrance/exit area remain clear.
A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to
occur. This is typically after the site has been stabilized.
When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to
discharge. Also inspect channels conveying the water from the wash area to the sediment trap and
stabilize areas that may be eroding.
When a construction entrance/exit is removed, excess sediment from the aggregate should be removed
and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface
following removal, typically by paving.
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-3
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
VTC-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-5
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
VTC-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Paving and Grinding Operations (PGO) SM-12
November 2010 Urban Drainage and Flood Control District PGO-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph PGO-1. Paving operations on a Colorado highway. Photo
courtesy of CDOT.
Description
Manage runoff from paving and grinding
operations to reduce pollutants entering
storm drainage systems and natural
drainageways.
Appropriate Uses
Use runoff management practices during
all paving and grinding operations such
as surfacing, resurfacing, and saw
cutting.
Design and Installation
There are a variety of management
strategies that can be used to manage runoff from paving and grinding operations:
Establish inlet protection for all inlets that could potentially receive runoff.
Schedule paving operations when dry weather is forecasted.
Keep spill kits onsite for equipment spills and keep drip pans onsite for stored equipment.
Install perimeter controls when asphalt material is used on embankments or shoulders near
waterways, drainages, or inlets.
Do not wash any paved surface into receiving storm drain inlets or natural drainageways. Instead,
loose material should be swept or vacuumed following paving and grinding operations.
Store materials away from drainages or waterways.
Recycle asphalt and pavement material when feasible. Material that cannot be recycled must be
disposed of in accordance with applicable regulations.
See BMP Fact Sheets for Inlet Protection, Silt Fence and other perimeter controls selected for use during
paving and grinding operations.
Maintenance and Removal
Perform maintenance and removal of inlet protection and perimeter controls in accordance with their
respective fact sheets.
Promptly respond to spills in accordance with the spill
prevention and control plan.
Paving and Grinding Operations
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
SF SILT FENCE
SEEDING AND MULCHING /
GENERAL LANDSCAPING
KEY BMP
EROSION CONTROL LEGEND
SEEDING AND MULCHING /
BUFFALO GRASS SEED MIX
CONTOUR LEGEND
EX. 1' INTERVAL CONTOURS
5100 EX. 5' INDEX CONTOURS
PR. 1' INTERVAL CONTOURS
5100 PR. 5' INDEX CONTOURS
VEHICLE TRAFFIC CONTROL
GOOD HOUSEKEEPING (PORTABLE
TOILET/TRASH RECEPTACLE)
CONCRETE WASHOUT
SF
SM
NS
VTC
GH
CWA CWA
X X
X
X
X X X
X
X X X
X
X
X X
X
UE
UE
UE UE
UE
SAN
SAN
SAN
SAN
SAN
W W W
W
W
SAN
SAN
W
W
SF
SF
SF
SF
SF
SF
SF
SF
SF
SF
UE
UE
UE
UE
UE
UE
UE
UE
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
50' NATURAL HABITAT BUFFER
EXISTING OUTBUILDINGS
TO BE REMOVED
50' NATURAL HABITAT BUFFER
EX. 30" CALIPER
COTTONWOOD
EXISTING
FENCE ALONG
R.O.W. LINE
EXISTING OUTBUILDING
TO POSSIBLY
BE RELOCATED NEAR
NORTH LOT LINE
EXISTING CITY TREES IN
PUBLIC RIGHT-OF-WAY
NOT TO BE DISTURBED
(SEE LANDSCAPE NOTES)
50' NATURAL HABITAT BUFFER
PROPOSED
RESIDENCE
ONE STORY, RANCH STYLE
TOP OF FOUNDATION: EL=5106.5
MAIN LEVEL:
FFE
=5107.7
GARAGE
TOF=5106.5
FFE=5105.5 (DOOR)
CONC. PATIO
5100
5101
5102
5103
5099
5098
5100
5104
COVERED FRONT PORCH
Lift
Station
51.7'
DIRECTIONAL BORE NEW
SERVICES TO THE UTILITY
STUBS UNDER CANAL (incl.
DRY UTIL's)
Refer to Ditch Crossing
Agreement
FUTURE IRRIGATION WATER
RETENTION AREA FOR
EXISTING DEEDED SURFACE
WATER RIGHTS. REFER TO
NARRATIVE.
20ft SIDE SETBACK
30ft FRONT SETBACK
ESTABLISH CLASS 6
ROADBASE AS NEEDED, per 40
TON REQUIREMENT
AS PLATTED LOCATION, FROM TOP of BANK
ANY DISTURBED AREAS SHALL BE RE-SEEDED
WITH APPROVED NATIVE GRASSES per CODE
FIRE FIGHTING ACCESS TO
THIS REMOTE LOCATION OF
THE HOME DOES NOT
EXCEED 150ft. FROM PAVED
ACCESS POINTS
TOTAL AREA OF
DISTURBANCE IS
APPROXIMATELY 40,000
s.f.
Shrubs
Shrubs
Grasses
EXISTING
CURB STOP EXISTING SAN. SEWER
CONNECTION
4000 s.f. OF OFFSETTING
MITIGATION ALONG WEST SIDE OF
LOT TO COMPENSATE FOR IMPACTS
TO EXISTING BUFFER AREA FROM
DISTURBANCE
TOTAL BUFFER ZONE=85,400s.f
DISTURBANCE IMPACT=4,000s.f.
MITIGATION OFFSET = 4,000s.f.
AS PLATTED LOCATION, FROM TOP of BANK
ANY DISTURBED AREAS SHALL BE RE-SEEDED WITH
APPROVED NATIVE GRASSES per CODE
AS PLATTED LOCATION, FROM TOP of BANK
ANY DISTURBED AREAS SHALL BE RE-SEEDED WITH
APPROVED NATIVE GRASSES per CODE
180'± to
Property
line
5105
5104
5103
5102
NATURAL HABITAT
BUFFER ZONE
THE NATURAL HABITAT BUFFER ZONE IS
INTENDED TO BE MAINTAINED IN A
NATIVE LANDSCAPE. PLEASE SEE
SECTION 3.4.1 OF THE LAND USE CODE
FOR ALLOWABLE USES WITHIN THE
NATURAL HABITAT BUFFER ZONE.
PR.
GRD.
EX.
GRD.
TIE INTO
EXISTING
GRADE
ELECTRIC SERVICE
24.4'
32.3'
5107
5106
5105
5105
5106
5107
5108
5105
5105
5104
5103
5102
5101
5100
5099
5098
5103
5104
5104
5105
5103
5104
5105
5102
5104
5105
5106
20' DIA. INVERTED TREE WELL (TYP, TREES #4 & 5)
E.A.E.
E.A.E.
SF
SILT FENCE
PS/MU
SEEDING/MULCHING
OR SOD
PS/MU
NATIVE SEEDING
w/ MULCH
VTC
(L=50')
CWA
GH
(PORTABLE TOILET/
TRASH RECEPTACLE)
SP
E.A.E. = EMERGENCY ACCESS
EASEMENT, PER EASEMENT
DEDICATION AGREEMENT
REV# DATE DESCRIPTION
JOB NUMBER:
SCALE: SHEET:
DRAWN BY:
PREPARED FOR:
PROJECT LOCATION:
REVISIONS
ORIGINAL DATE:
DESIGN BY: ORIGINAL DATE:
SEAL AND SIGNATURE REQUIRED
FOR OFFICIAL OR CONSTRUCTION
DRAWINGS.
THIS DRAWING MAY BE DUPLICATED FOR THE PURPOSE OF
PROVIDING ADDITIONAL COPIES OF THE SAME DESIGN (SAME
PROJECT) TO MULTIPLE PARTIES OR BY JURISDICTION FOR
RECORDING, ETC. THIS DESIGN MAY NOT, HOWEVER, BE APPLIED
TO OTHER SITES/PROPERTIES WITHOUT EXPRESS WRITTEN
CONSENT OF OR THOROUGH REVIEW BY PRISM DESIGN &
CONSULTING GROUP.
THIS DESIGN MAY BE SUBMITTED TO JURISDICTION FOR
REVIEW/PERMIT WITHIN 1 YEAR FROM THE DATE OF THE
SEAL/SIGNATURE. AFTER THIS TIME, PRISM DESIGN &
CONSULTING GROUP RESERVES THE RIGHT TO REVIEW THE PLANS
TO CONFIRM THEY ARE IN COMPLIANCE WITH CURRENT
REGULATIONS/CRITERIA.
DESIGN & CONSULTING GROUP
P.O. BOX 441730 phone: 720-689-7324
AURORA, CO. 80044 web: PrismDCG.COM
LANDSCAPING & SITE PLAN PRISM
19-024
LOT 2 of COUTURE SUBDIVISION
DUSTIN COUTURE - OWNER
315 S. IMPALA DRIVE
FORT COLLINS, CO 80521
AS SHOWN
GLR
2 2
FALCON DRIVE and TAFT HILL ROAD
FORT COLLINS, COLORADO
10/27/19
BWJ/GLR 10/27/2019
C1.1
SITE BENCHMARK : RIM OF SAN. SEWER MANHOLE
AS DEPICTED. El=5106.60 NAVD29
SITE PLAN
COUTURE RESIDENCE
Lot 2, Couture Subdivision
NE1/4 of Section 28, T.7N., R.69W., 6th P.M.
Ft. COLLINS, COLORADO
SCALE: 1" = 30'
31692
7/23/20
Tree Inventory and Mitigation Information: 3009 S Taft Hill Road
# Species DBH Condition Mitigation Notes
1 Siberian Elm (Ulmus pumila) 25 Fair minus 2 OUTSIDE LOD-RETAIN
2 Siberian Elm (Ulmus pumila) 18 Poor 1.5 TO BE REMOVED
3 Siberian Elm (Ulmus pumila) 13 Fair 1 TO BE REMOVED
4 Cottonwood (Populus sargentii) 32 Fair Plus 3 RETAIN
5 Cottonwood (Populus sargentii) 18 Fair 2 RETAIN
6 Bur oak (Quercus macrocarpa) 7 Fair 1 STREET TREE - RETAIN
7 Bur oak (Quercus macrocarpa) 8 Fair plus 1 STREET TREE - RETAIN
8 Texas Red Oak (Quercus buckleyi) 5 Fair plus 1 STREET TREE - RETAIN
9 Texas Red Oak (Quercus buckleyi) 5 Fair 1 STREET TREE - RETAIN
10 Texas Red Oak (Quercus buckleyi) 7 Fair 1 STREET TREE - RETAIN
11 Northern Catalpa (Catalpa speciosa) 7 Fair 1 STREET TREE - RETAIN
12 Bur oak (Quercus macrocarpa) 8 Fair plus 1 STREET TREE - RETAIN
13 Bur oak (Quercus macrocarpa) 7 Fair 1 STREET TREE - RETAIN
REQ MITIGATION: 3 TREES (2.5 ROUNDED UP)
Mitigation Trees
M14 Ponderosa Pine (Pinus ponderosa) 8' tall, B&B
M15 Cottonwood (Populus sargentii) 2", B&B
M16 Ponderosa Pine (Pinus ponderosa) 8' tall, B&B
Shrubs
17, 18, 19 Red Elderberry (Sambucus
microbotrys) #5 GAL
20-25 Sand Cherry (Cerasus pumila) #5 GAL
26, 27, 28 Mountain Ninebark (physocarpis
monogynus) #5 GAL
R1 5/2/20 PER CITY COMMENTS LETTER, DATED 1/10/2020
LANDSCAPE NOTES:
- PROPOSED LANDSCAPING IS AS DIRECTED BY
OWNER.
- SEED MIX:
* BUFFALOGRASS (100%)
* 13-15 PLS/ACRE FOR DRILL-SEED
APPLICATION, DOUBLE FOR BROADCAST
APPLICATION.
- REQUIRED TREE SIZES AND METHOD OF
TRANSPLANT:
* CANOPY SHADE TREE: 2.0" CALIPER BALLED
AND BURLAPPED
* EVERGREEN TREE: 8.0' HEIGHT BALLED AND
BURLAPPED
* ORNAMENTAL TREE: 2.0" CALIPER BALLED AND
BURLAPPED
TREE MITIGATION NOTE:
TREE MITIGATION REQUIREMENTS AS REQUIRED BY 3.2.1(F), TREE
PRESERVATION AND MITIGATION, SHALL NOT APPLY TO THE BOUNDARY OF THE
PLEASANT VALLEY LAKE AND CANAL COMPANY'S EASEMENT AND SHALL BE
EXCLUDED FROM THE LIMITS OF DEVELOPMENT DUE TO THE EXCLUSIVE RIGHT
OF THE DITCH COMPANY TO OPERATE, MAINTAIN, ALTER, ENLARGE RELOCATE,
CLEAN, AND MANAGE THE DITCH. THE CITY OF FORT COLLINS LAND USE CODE
EXPRESSLY EXCLUDES THE USE OF LAND FOR THE PURPOSE OF DELIVERING
WATER BY DITCH OR CANAL FROM THE DEFINITION OF DEVELOPMENT,
PROVIDED THAT IT DOES NOT CREATE A NUISANCE.
R2 6/23/20 PER CITY COMMENTS LETTER, DATED 6/5/2020
R3 7/23/20 PER CITY COMMENTS