HomeMy WebLinkAboutARROWHEAD COTTAGES - MJA/FDP - FDP160004 - REPORTS - STORMWATER MANAGEMENT PLANSTORMWATER MANAGEMENT PLAN (SWMP)
ARROWHEAD COTTAGES
Fort Collins, CO
June 3, 2016
Prepared for:
Landmark Construction Solutions
1170 W. Ash Street #100
Windsor, CO 80550
970-330-4316
Prepared by:
301 N. Howes Street, Unit 100
Fort Collins, Colorado 80521
Phone: 970.221.4158
www.northernengineering.com
Project Number: 374-018
This Drainage Report is consciously provided as a PDF.
Please consider the environment before printing this document in its entirety.
When a hard copy is absolutely necessary, we recommend double-sided printing.
301 N. Howes Street, Suite 100, Fort Collins, CO 80521 970.221.4158 www.northernengineering.com
June 3, 2016
Landmark Construction Solutions
1170 W. Ash Street #100
Windsor, CO 80550
RE: Stormwater Management Plan
Arrowhead Cottages
Replat of Centre Avenue Residences
To Whom It May Concern:
Northern Engineering Services, Inc. is pleased to submit this Stormwater Management Plan for
Arrowhead Cottages. This report outlines Best Management Practices (BMPs) to be implemented
with the proposed construction in order to minimize potential pollutants in stormwater discharges.
We have prepared this report to accompany the Colorado Department of Public Health and
Environment General Permit for Stormwater Discharge Associated with Construction Activities (aka,
Stormwater Discharge Permit or SDP). The General Permit No. for this SDP is (to be filled-in by
permittee) and the Certification No. for this SDP is (to be filled-in by permittee). The Permit
Certification is Effective beginning (to be filled-in by permittee), and initial certification expires (to be
filled-in by permittee). A copy of the issuance cover letter can be found in the Appendix D of this
document (to be provided by permittee).
Please note: this Stormwater Management plan (including the Site Maps) is not a static document.
It is a dynamic device that should be kept current and logged as construction takes place. As such,
this version was prepared to facilitate initial plan approvals and permitting, but does not necessarily
reflect the final version, or the transitions throughout the construction process. As the site develops
and changes, the Contractor is expected and encouraged to make changes to what is contained
herein so that the SWMP works as effectively and efficiently as possible. It shall be the
responsibility of the SWMP Administrator and/or the permit holder (or applicant thereof) to ensure
the plan is properly maintained and followed.
If you should have any questions or comments as you review this report, please feel free to contact
us at your convenience.
Sincerely,
NORTHERN ENGINEERING SERVICES, INC.
Danny Weber, PE
Arrowhead Cottages
Stormwater Management Plan
TABLE OF CONTENTS
Vicinity Map
1.0 General Requirements ................................................................................................ 1
1.1 Objectives .................................................................................................................. 1
1.2 SMWP Availability ...................................................................................................... 1
1.3 Definitions.................................................................................................................. 1
1.4 Additional Permitting ................................................................................................... 1
2.0 Narrative Site Description ........................................................................................... 2
2.1 Existing Site Description .............................................................................................. 2
2.2 Nature of Construction Activity ..................................................................................... 2
2.3 Sequence of Major Activities ......................................................................................... 2
2.4 Site Disturbance ......................................................................................................... 3
2.5 Existing Data .............................................................................................................. 3
2.6 Existing Vegetation ...................................................................................................... 3
2.7 Potential Pollution Sources ........................................................................................... 3
2.8 Non-stormwater discharges .......................................................................................... 4
2.9 Receiving Waters ........................................................................................................ 4
3.0 Stormwater Management Controls ............................................................................... 4
3.1 SWMP Administrator ................................................................................................... 4
3.2 Best Management Practices (BMP’s) for Stormwater Pollution Prevention.......................... 5
3.3 Structural Practices for Erosion and Sediment Control ..................................................... 5
3.4 Non-Structural Practices for Erosion and Sediment Control .............................................. 7
3.5 Phased BMP Installation .............................................................................................. 9
3.6 Material Handling and Spill Prevention ........................................................................ 10
3.7 Dedicated Concrete or Asphalt Batch Plant .................................................................. 10
3.8 Vehicle Tracking Control ............................................................................................ 11
3.9 Waste Management and Disposal ............................................................................... 11
3.10 Groundwater and Stormwater Dewatering .................................................................... 11
4.0 Final Stabilization and Long-Term Stormwater Management ........................................ 11
4.1 Final Stabilization ..................................................................................................... 11
4.2 Long-Term Stormwater Management ........................................................................... 12
5.0 Inspection, Maintenance and Record Keeping ............................................................. 12
5.1 BMP Inspection ........................................................................................................ 12
5.2 BMP Maintenance .................................................................................................... 12
5.3 Record Keeping ........................................................................................................ 12
6.0 Additional SWMP and BMP Resources ....................................................................... 14
References 15
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Stormwater Management Plan
APPENDICES:
APPENDIX A – Site Maps
APPENDIX B – Erosion Control Details
APPENDIX C – Landscape Plan
APPENDIX D – Copies of Permits/Applications
APPENDIX E – Inspection Logs
APPENDIX F – Erosion Control Escrow Estimate
APPENDIX G – Contractor Inserts (as needed)
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Stormwater Management Plan 1
1.0 General Requirements
1.1 Objectives
The objective of a Stormwater Management Plan (SWMP) is to identify all potential sources of
pollution likely to occur as a result of construction activity associated with the site construction, and
to describe the practices that will be used to reduce the pollutants in stormwater discharges from
the site. The SWMP must be completed and implemented at the time the project breaks ground,
and revised as necessary as construction proceeds to accurately reflect the conditions and practices
at the site.
This report summarizes the Stormwater Management Plan for the construction activity that will
occur with Arrowhead Cottages in Fort Collins, CO. This plan has been prepared according to
regulations of the Colorado Department of Public Health and Environment (CDPHE), Water Quality
Control Division.
1.2 SMWP Availability
This report is intended to remain on the aforementioned construction site to allow for maintenance
and inspection updates, and for review during inspection.
1.3 Definitions
BMP – Best Management Practice encompassing a wide range of erosion and sediment control
practices, both structural and non-structural in nature, which are intended to reduce or eliminate
any possible water quality impacts from stormwater leaving a construction site.
Erosion Control BMPs – Practices that PREVENT the erosion of soil, such as minimizing the amount
of disturbed area through phasing, temporary stabilization, and preserving existing vegetation.
Sediment Control BMP’s – Practices to REMOVE sediment from runoff, such as sediment basins,
silt fence, or inlet protection.
Non-structural BMP’s – The implementation of methods, practices, and procedures to minimize
water quality impacts, such as the preservation of natural vegetation, preventive maintenance and
spill response procedures.
Structural BMP’s – Physical devices that prevent or minimize water quality impacts, such as
sediment basins, inlet protection, or silt fence.
1.4 Additional Permitting
As mentioned above, this Stormwater Management Plan is associated with the Colorado
Department of Public Health and Environment Stormwater Permit issued by the Water Quality
Control Division of the Colorado Department of Public Health and Environment (CDPHE).
Additional Environmental permitting not described in this report may be required as a part of this
project. An example is the Construction Dewatering Permit for groundwater. Another example is
the Air Pollution Emission Notice (APEN). The CDPHE website contains links to both of these
permits, as well as many other potential permits. The Contractor is responsible for ensuring the
proper permits are acquired.
CDPHE Construction Permit Website:
http://www.colorado.gov/cs/Satellite/CDPHE-WQ/CBON/1251596875260
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Stormwater Management Plan 2
2.0 Narrative Site Description
2.1 Existing Site Description
Arrowhead Cottages is a replat of Centre Avenue Residences, located in Section 23, Township 7
North, Range 69 West of the 6th P.M., City of Fort Collins, County of Larimer, State of Colorado.
The site is partially developed with an existing multi-story apartment complex, parking and
detention pond. The remaining site is comprised of mostly vacant land with bare soils, natural
grasses and vegetation. Bounded to the north by the New Mercer Ditch, to the west by Worthington
Circle, to the south by Centre Avenue, and to the east by an existing commercial development.
2.2 Wind and Rainfall Erodibility
According to the Natural Resources Conservation Service website -www.websoilsurvey.nrcs.usda.gov,
the applicable Wind Erodibility Group (WEG), which indicates the susceptibility to wind erosion in
cultivated areas, is 6. This value is indicative of soils moderately to highly susceptible to wind
erosion. Additionally, the applicable soil erosion factor (K), which indicates the susceptibility of a
soil to sheet and rill erosion, is 0.28 to 0.32. This value is indicative of soils moderately susceptible
to rainfall erosion.
Impervious area (i.e., roof area, concrete walks and asphalt/paver parking area) and landscaping
will permanently stabilize the areas disturbed by the proposed construction activity; therefore, the
likelihood of erosion and sediment problems occurring on-site is minimal. During the interim
period, in which the disturbed areas are open, the BMPs described herein were selected to prevent
erosion and limit sediment migration.
2.3 Nature of Construction Activity
The proposed project site plan is composed of Multi-Family Housing (condos). This site will employ
many water quality features and runoff reduction facilities including porous pavers, bio-retention
ponds (rain gardens), and bio-swales. The installation of proposed utilities (e.g., electric, gas,
sanitary sewer, domestic water and storm drain) will occur next. While building foundations are
being constructed, concrete curbs will be installed around the proposed parking areas. A permeable
paver section within the access drives will likely follow completion of exterior construction. The fine
grading of the landscaped areas and the installation of landscaping will mark the completion of the
construction activities.
2.4 Sequence of Major Activities
To complete the project, many basic categories of construction activity will take place. The first
part of the project will consist of overlot grading. Within this phase, protection will need to be
supplied to the existing streets and inlets, as well as other perimeter protection. With the
surroundings, type of perimeter protection will vary due to the differing types of ground material. It
will be the Contractor’s responsibility to implement the appropriate measure to suit the installation
and type of ground material. This will be followed by utility installation and foundation excavation.
Vertical construction of the Multi-Family Housing will commence after foundation and underground
work is complete. New curb/gutter, paving, and sidewalks are expected to begin after the building
is dried in and tradecrafts move inside. Installation of the permeable paver system is likely to occur
at this time. The final stages of site construction will be fine grading of the areas around the
buildings, and the installation of landscaping throughout the project. The aforementioned
sequencing is an initial best guess, and is subject to change at the Contractor’s discretion.
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Stormwater Management Plan 3
2.5 Site Disturbance
The site disturbance will occur in and off of the project property is approximately 1.06 acres.
Grading of the entire site is expected in order to reach final grades.
2.6 Existing Data
In order to complete the associated construction plans, a topographical survey of the site was
completed. This survey consisted of field measurements made by Northern Engineering Services on
October 2008 and March 2009.
In addition to the field survey, a geotechnical report was used to determine existing soil types found
on-site. According to the report by Earth Engineering Consultants dated October 13, 2008 lists the
soils for the area as consisting of layers of sandy lean clay (CL) and clayey sand (SC). These soils
are classified as Hydrologic Soil Group C and have a low infiltration rate.
2.7 Existing Vegetation
The existing site is comprised of an existing multi-family dwelling, associated parking, and detention
pond with the remainder mostly vacant land with bare soils, natural grasses and vegetation. The
approximate percent existing vegetative cover is 50%. It is highly recommended that pre-
construction photos be taken to clearly document vegetative conditions prior to any disturbance
activities.
2.8 Potential Pollution Sources
As is typical with most construction sites, there are a number of potential pollution sources which
could affect water quality. It is not possible for this report to identify all materials that will be used
or stored on the construction site. It is the sole responsibility of the Contractor to identify and
properly handle all materials that are potential pollution sources. The following are some common
examples of potential pollution sources:
• Exposed and stored soils
• Management of contaminated soils
• Off-site tracking of soils and sediment
• Loading and unloading operations
• Outdoor storage of building materials, fertilizers, chemicals, etc.
• Vehicle and equipment maintenance and fueling
• Significant dust or particulate generating processes
• Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, oils, etc.
• On-site waste disposal practices (waste piles, dumpsters, etc.)
• Concrete truck/equipment washing
• Non-industrial waste sources that may be significant, such as worker trash and portable toilets
• Uncovered trash bins
• Other areas or procedures where potential spills can occur
• Stockpiling of materials that can be transported to receiving waterway(s)
Management of Contaminated Soils: We are not aware of on-site contaminated soils. However, the
contractor should conduct a thorough, pre-construction environmental site assessment. If
contaminated soils are discovered, the contractor will identify appropriate practices and procedures
for the specific contaminants discovered on-site.
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Stormwater Management Plan 4
Loading and Unloading Operations: During site demolition, material loading and unloading will
occur on-site. As site development and building construction progresses, space constraints will limit
the number of on-site locations for loading and unloading activities to the site. The contractor will
be responsible for the proper handling and management of traffic control and pollution sources
during loading and unloading operations.
Dedicated Asphalt and Concrete Batch Plants: Neither a dedicated asphalt or concrete batch plant
will be constructed on-site.
2.9 Non-stormwater discharges
The Stormwater Construction Permit only covers discharges composed entirely of stormwater.
Emergency firefighting water is the only authorized exception. Concrete Washout water can NOT be
discharged to surface waters or to storm sewer systems without separate permit coverage. The
discharge of Concrete Washout water to the ground, under specific conditions, may be allowed by
the Stormwater Construction Permit when appropriate BMPs are implemented.
The discharge of pumped stormwater, ONLY, from excavations, ponds, depressions, etc. to surface
waters, or to a municipal storm sewer system is allowed by the Stormwater Construction Permit, as
long as the dewatering activity and associated BMPs are identified in the Stormwater Management
Plan (SWMP) and are implemented in accordance with the SWMP.
Aside from the exceptions noted above, non-stormwater discharges must be addressed in a separate
permit issued for that discharge. If groundwater is encountered, and dewatering is required, a
Construction Dewatering Permit must be acquired from the Colorado Department of Public Health
and Environment.
2.10 Receiving Waters
The northern portion of the site sheet drains to an existing on-site detention pond designed and
constructed during the Centre Avenue Residences development plan. The detention pond has
established vegetation and no construction activities are planned in this area. This detention pond
outfalls to a storm sewer system located under Centre Avenue.
The southern portion of the site sheet drains to an existing inlet located at the northeast corner of
Centre Avenue and Worthington Circle where flows are routed east. A small area sheet drains to
the eastern curb and gutter of Worthington Circle where flows are directed north to an inlet that
discharges back into the existing on-site detention pond.
3.0 Stormwater Management Controls
3.1 SWMP Administrator
A SWMP Administrator must be designated in conjunction with the Stormwater Permit. This person
shall be responsible for developing, implementing, maintaining, and revising the SWMP. The
SWMP Administrator will also be the contact for all SWMP-related issues and will be the person
responsible for the accuracy, completeness, and implementation of the SWMP. The Administrator
should be a person with authority to adequately manage and direct day-to-day stormwater quality
management activities at the site.
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Stormwater Management Plan 5
The SWMP Administrator for this site is:
Name: (to be filled-in by permittee)
Company: (to be filled-in by permittee)
Phone: (to be filled-in by permittee)
E-mail: (to be filled-in by permittee)
3.2 Best Management Practices (BMP’s) for Stormwater Pollution Prevention
Beginning from mobilization, and throughout the entire construction of the project, erosion control
devices shall be installed to ensure minimal pollutant migration. These erosion control devices may
be installed in phases, or not at all, depending on actual conditions encountered at the site. It is
the responsibility of the Contractor to make the determination as to what practices should be
employed and when. In the event that a review agency deems BMPs to be insufficient, it shall be
the responsibility of the contractor to implement modifications as directed.
Best Management Practices (BMPs) are loosely defined as a method, activity, maintenance
procedure, or other management practice for reducing the amount of pollution entering a water
body. The term originated from rules and regulations in Section 208 of the Clean Water Act.
Details for Structural and Non-Structural BMPs have been included in Appendix B. These details
should be used for additional information on installation and maintenance of BMPs specified in this
report. It is also intended to serve as a resource for additional BMPs that may be appropriate for
the site that have not specifically been mentioned in the report.
3.3 Structural Practices for Erosion and Sediment Control
Structural BMPs are physical devices that are implemented to prevent erosion from happening or to
limit erosion once it occurs. These devices can be temporary or permanent, and installation of
individual components will vary depending on the stage of construction.
A table depicting construction sequence and BMP application/removal has been placed on the
“Dynamic Site Plan” to help document the implementation of these BMPs. Refer to the Stormwater
Management Plan Static Site Plan in the Appendix for the assumed location of all BMPs.
Construction Details for Temporary BMPs are located in the Appendix for reference.
Again, the final determination for which BMP’s will be installed, where they will be located, and
when they will be installed shall be made by the Contractor, along with all documentation
throughout the construction process.
Silt Fencing (Phase I)
Silt fencing shall be provided to prevent migration of sediment off-site or into adjacent properties.
All silt fencing shall be installed prior to any land disturbing activity (demolition, stockpiling,
stripping, grading, etc.). Silt fencing is to be installed prior to site excavation or earthwork
activities.
Inspections of the silt fence should identify tears or holes in the material, and should check for
slumping fence or undercut areas that allow flows to bypass the fencing. Damaged sections of
fencing should be repaired or replaced to ensure proper functioning. Sediment accumulated behind
the silt fence should be removed to maintain BMP effectiveness, typically before it reaches a depth
of 6 inches.
At a minimum, it is suggested that silt fencing shall be located along the northern and southern
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limits of disturbance. Silt fencing can be installed in conjunction with/adjacent to construction or
security fencing. Sediment Control Logs may also be substituted in lieu of silt fencing, as
appropriate. See below for a description of Sediment Control Logs.
Sediment Control Log – aka “Straw Wattles” (Phase I)
A Sediment Control Log is a linear roll made of natural materials, such as straw, coconut fiber, or
other fibrous material trenched into the ground and held with a wooden stake. Sediment Control
Logs can be used in many instances. Examples include perimeter control for stockpiles, as part of
inlet protection designs, as check dams in small drainage ways, on disturbed slopes to shorten flow
lengths, or in lieu of silt fencing (where appropriate).
Sediment Control Logs should be inspected for excess sediment accumulation. Sediment should be
removed prior to reaching half the height of the log.
At a minimum, Sediment Control Logs should be used around soil stockpiles (including landscape
material), drainage swales, and at all stormwater discharge locations other than inlets.
Vehicle Tracking Control Pads (Phase I)
Vehicle tracking control pads shall be provided to minimize tracking of mud and sediment onto
paved surfaces and neighboring roadways. All vehicle tracking control pads shall be installed prior
to any land disturbing activity (demolition – as necessary, stockpiling, stripping, grading, etc.).
Location of vehicle tracking control pads will be located at any and all existing and future vehicle
accesses being used during any of the construction phases. These locations will primarily be
dictated by gates or openings in the temporary construction fencing that is expected to be installed.
Vehicle tracking control pads are to be installed prior to demolition (as appropriate), site excavation
or earthwork activities.
Vehicle tracking pads should be inspected for degradation and aggregate material should be
replaced as needed. If the area becomes clogged with water, excess sediment should be removed.
Aggregate material should remain rough, and at no point should aggregate be allowed to compact in
a manner that causes the tracking pad to stop working as intended.
Suggested locations for a vehicle tracking pad is at the proposed access to the site from Centre
Avenue.
Inlet Protection (Phase I & II)
Inlet protection shall be provided for existing inlets to prevent sediment transport from adjacent
earthwork disturbance. Installation of these filters shall occur before adjacent earth disturbing
activities (Phase I implementation). Wattle type filters are to be implemented for new and existing
inlets where asphalt does not exist. For these inlets, if pavement is constructed adjacent to the
structure or if the area adjacent to the inlet is changed such that the wattle type filter is no longer
effective, it shall be the responsibility of the Contractor to ensure that an appropriate method is
used instead. For example, the wattle filter could be reused, or a gravel-block inlet filter may be
installed. It will be left to the discretion of the Contractor as to whether replacement of any inlet
filter is necessary.
Inlet protection should be inspected regularly for tears that can result in sediment entering an inlet.
Inlet protection should also be inspected for sediment accumulation upstream of the inlet, and
sediment should be removed when the less than half of the capacity is available, or per
manufacturer specifications.
The Contractor shall provide inlet protection for all proposed inlets as they are installed (Phase II
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implementation) and at all existing inlets adjacent the site on Centre Avenue and Worthington Circle
(Phase I).
Concrete Washout Area (Phase II-III)
A concrete washout should be provided on the site. The washout can be lined or unlined excavated
pits in the ground, commercially manufactured prefabricated containers, or aboveground holding
areas. The concrete washout must be located a minimum of 400 feet from any natural drainage
way or body of water, and at least 1000 feet from any wells or drinking water sources. Washout
areas should not be located in an area where shallow groundwater may be present. Contractor
shall clearly show the desired location and access to the Concrete Washout Area on the Stormwater
Management Plan - Dynamic Site Plan. Contractor shall place a Vehicle Tracking Pad if the
selected location for the Concrete Washout Area is detached from pavement. Clear signage
identifying the concrete washout should also be provided.
The Concrete Washout Area should be inspected regularly. Particular attention should be paid to
signage to ensure that the area is clearly marked. Confirmation that the washout is being used
should also be noted to ensure that other undesignated areas of the site are not being used
incorrectly as a concrete washout.
An appropriate location for the concrete washout area is located interior to the site, away from
discharge points. This location is a suggestion only, and can be relocated at the discretion of the
Contractor.
Permanent/Established Vegetation (Phase IV)
Permanent or established vegetation and landscaping is considered a permanent form of sediment
and erosion control for common open spaces, steep slopes and areas not exposed to prolonged
scour velocities, or acute incipient motion bed shear stresses that will create soil erosion, rill
formation and subsequent sediment transport. Areas where the previous conditions apply will
contain sufficient permanent BMPs, such as riprap or cobble mulch. Permanent vegetation shall
conform to an approved Landscaping Plan.
3.4 Non-Structural Practices for Erosion and Sediment Control
Non-Structural BMPs are practices or activities that are implemented to prevent erosion from
happening or to limit erosion once it occurs. These BMPs can be a practice resulting in physical
change to the site, such as mulching or slope stabilization. They can also result in behavioral
changes on the site, such as changes to construction phasing to minimize exposure to weather
elements, or increased employee awareness gained through training.
Protection of Existing Vegetation (Phases I-IV)
Protection of existing vegetation on a construction site can be accomplished through installation of a
construction fence around the area requiring protection. In cases where up-gradient areas are
disturbed, it may also be necessary to install perimeter controls to minimize sediment loading to
sensitive areas such as wetlands.
Trees that are to remain after construction is complete must be protected. Most tree roots grow
within the top 12”-18” of soil, and soil compaction is a significant threat to tree health. As such,
particular care should be taken to avoid activities within the drip-line of the tree. Direct equipment
damage should also be prevented. The most effective way to ensure the health of trees is to
establish a protection zone at the drip-line of the tree to prevent unintended activity in the area
directly surrounding the tree.
Fencing should be inspected and repaired when needed. If damage occurs to a tree, an arborist
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should be consulted on how to care for the tree. If a tree is damage beyond repair, the City Forester
should be consulted on remediation measures.
No existing vegetation is expected to be preserved with this development.
Stockpile Management (Phases I-IV)
Stockpile management should be utilized to minimize erosion and sediment transport from soil
stockpiles. In general, soil stockpiles should be located a minimum of 100 feet from any drainage
way and 50 feet from any storm sewer inlets. Where practical, choose a stockpile location that will
remain undisturbed for the longest period of time as the phases of construction progress. Sediment
control BMPs should be placed around the perimeter of the stockpile, and a designated access point
on the upstream side of the stockpile should be identified. BMPs such as surface roughening,
temporary seeding, mulching, erosion control blankets, or soil binders should be used to stabilize
the stockpile surface.
As a part of stockpile management, regular inspections of the perimeter controls should be
completed. If BMPs have been utilized to stabilize the surface of the stockpile, they should be
inspected and repaired as needed.
While significant soil stockpiles are not expected with this project, it is possible that foundation
excavation or the delivery landscaping material may generate temporary stockpiles. The location of
any such stockpiles shall be the responsibility of the SWMP Administrator.
Mulching (Phase I-IV)
Mulching helps reduce erosion by protecting bare soil from rainfall impact, increasing infiltration,
and reducing runoff. Although often applied in conjunction with temporary or permanent seeding, it
can also be used for temporary stabilization of areas that cannot be reseeded due to seasonal
constraints. The most common type of mulch used is hay or grass that is crimped into the soil to
keep it secure. However, crimping may not be practical on slopes steeper than three to one
(3H:1V).
The Contractor shall mulch all planted areas within twenty-four (24) hours after planting. Only
weed-free and seed-free straw mulch may be used. Straw mulch should be applied at two (2) tons
per acre, and shall be adequately secured by crimping, tackifier, netting or blankets. Hydraulic
mulching may also be used on steep slopes or where access is limited. In the case that hydraulic
mulching is utilized, the Contractor shall use wood cellulose fibers mixed with water at two
thousand to two thousand five hundred (2,000-2,500) pounds per acre and organic tackifier at one
hundred to four hundred (100-400) pounds per acre.
Wind Erosion/Dust Control (Phase I-IV)
Wind Erosion and Dust Control BMP’s help to keep soil particles from entering the air as a result of
land disturbing construction activities. Examples include use of a water truck or irrigation/sprinkler
system to wet the top layer of disturbed soil, seeding and mulching, soil binders, or wind fences.
If a water truck or irrigation/sprinkler system is utilized, monitoring to ensure that sufficient water is
applied is crucial to ensuring soil particles don’t become airborne. Equally important is monitoring
for overwatering, as too much water can lead to increased erosion.
Street Sweeping (Phases I -IV)
Street sweeping should be used to remove sediment that has been tracked onto adjacent roadways.
Roadways should be inspected at least once a day, and sediment should be removed as needed. A
check of the area inlet protection should be completed after sweeping to ensure nothing was
displaced during sweeping operations. Street sweeping can reduce the sediment washed into the
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existing storm drain system. Street sweeping may be necessary on the existing hardscape areas
which receive runoff from the disturbed areas.
Saw Cutting Pollution Prevention (Phase I)
The following protocol is recommended to prevent dust and slurry from asphalt and concrete saw
cutting activities from migrating into the existing storm drain system.
• Slurry and cuttings shall be vacuumed during cutting and surfacing operations
• Slurry and cuttings shall not remain on permanent concrete or asphalt pavement
overnight
• Slurry and cuttings shall not drain to any natural or constructed drainage conveyance
• Collected slurry and cuttings shall be disposed of in a manner that does not violate
groundwater or surface water standards
Good Housekeeping Practices (All phases)
Good housekeeping practices that will prevent pollution associated with solid, liquid, and hazardous
construction-related materials and wastes should be implemented throughout the project.
Examples of good housekeeping include providing an appropriate location for waste management
containers, establishing proper building material staging areas, designating paint and concrete
washout areas, establishing proper equipment/vehicle fueling and maintenance practices.
Development of a spill prevention and response plan is another example of Good Housekeeping
practices that should be used on the project. The following items are detailed examples of some of
the good housekeeping practices that should be utilized throughout the project. It should be noted
that a complete list of practices and detailed discussion regarding good housekeeping has been
included with Appendix B, sheets GH-1 – GH-6.
Street Sweeping and Vacuuming – Street sweeping and vacuuming should be used to remove
sediment that has been tracked onto adjacent roadways. Roadways should be inspected at least
once a day, and sediment should be removed as needed. A check of inlet protection should be
completed after sweeping to ensure nothing was displaced during sweeping operations.
Waste Management – Designate trash and bulk waste collection areas on-site. When possible,
materials should be recycled. Hazardous material waste should be segregated from other solid
waste. Waste collection areas should be located away from streets, gutters, watercourses, and
storm drains. Dumpsters should be located near site entrances to minimize traffic on disturbed
soils, and they should be placed on a level soil surface.
Establish Proper Building Material Handling and Staging areas – Clearly designate site areas for
staging and storage of building materials. Provide appropriate BMPs to ensure that spills or leaks
are contained.
Establish Proper Equipment/Vehicle Fueling and Maintenance Practices – If needed, create a
clearly designated on-site fueling and maintenance area that is clean and dry. Provide appropriate
BMPs to ensure that spills or leaks are contained.
3.5 Phased BMP Installation
It is important to recognize the four (4) major Development Phases as defined by the State of
Colorado’s Stormwater Discharge Permit (SDP). These four development phases (referred to as
Sequencing by the City of Fort Collins) have been distinguished to aid in the appropriate timing of
installation/implementation of BMPs at different stages of the construction process. These phases
are described as follows:
Arrowhead Cottages
Stormwater Management Plan 10
Phase I – Grading Stage; BMPs for initial installation of perimeter controls
Phase II – Infrastructure Stage; BMPs for utility, paving and curb installation
Phase III – Vertical Construction Stage; BMPs for individual building construction.
Phase IV – Permanent BMPs and final site stabilization.
Included in the back map pockets are Site Plans: a “Static” Site Plan and “Dynamic” Site Plans.
The “Static” plan serves to display the overall management plan all at once. However, proper
implementation of BMPs does not occur at once, and certain BMPs may move location in the
construction process; therefore, the “Dynamic” Site Plans are intended for the Contractor to write in
the BMP symbols to document the location and time the BMPs are installed and maintained
throughout the entire construction process.
3.6 Material Handling and Spill Prevention
Potential pollution sources, as discussed in earlier sections, are to be to be identified by the
Contractor. Spill prevention procedures are to be determined and put in place prior to construction
by the Contractor. A spill and flooding response procedure must also be determined and put in
place prior to construction by the Contractor. Additionally, steps should be taken to reduce the
potential for leaks and spills to come in contact with stormwater runoff, such as storing and
handling toxic materials in covered areas or by storing chemicals within berms or other secondary
containment devices.
A notification procedure must be put in place by the Contractor, by which workers would first notify
the site construction superintendent, who would then notify the SWMP Administrator. Depending
on the severity of the spill, the site construction superintendent and SWMP Administrator would
possibly notify the Colorado Department of Public Health and Environment - Water Quality Control
Division, downstream water users, or other appropriate agencies. The release of any chemical, oil,
petroleum product, sewage, etc., which enter waters of the State of Colorado (which include
surface water, ground water, and dry gullies or storm sewers leading to surface water) must be
reported immediately to the Division’s emergency spill reporting line at (877) 518-5608. All
spills that will require cleanup, even if the spill is minor and does not need to be reported to the
state, should still be reported to the City of Fort Collins Utilities office at 970-221-6700.
While not expected with this project, it will be the responsibility of the Contractor to designate a
fueling area and take the necessary precautions to ensure that no stormwater pollution occurs in the
event that a fueling area is needed. Fueling areas shall be located a minimum 100 feet from all
drainage courses. A 12-inch high compacted earthen ridge capable of retaining potential spills
shall enclose fueling areas. Other secondary containment devices can be used instead of the
earthen ridge. The area shall be covered with a non-porous lining to prevent soil contamination.
Printed instructions for cleanup procedures shall be posted in the fueling area and appropriate fuel
absorbents shall be available along with containers for used absorbents within the fueling area.
3.7 Dedicated Concrete or Asphalt Batch Plant
There are not any dedicated concrete or asphalt batch plants anticipated with this project. In the
event that a plant is needed, the Contractor should be aware that additional permitting will be
required. In particular, an Air Pollutant Emission Notice (APEN) will need to be obtained from the
CDPHE.
Arrowhead Cottages
Stormwater Management Plan 11
3.8 Vehicle Tracking Control
In addition to the vehicle tracking pads discussed previously, additional measures can be taken to
minimize and control sediment discharges from the site due to vehicle tracking. These measures
can include fencing around the site to control access points. Regular street sweeping can also be
used to minimize the transmission of sediment from the site due to vehicles leaving the site. The
use of gravel parking areas and wash racks can also be implemented to ensure minimal vehicle
tracking from the site.
3.9 Waste Management and Disposal
It will be the responsibility of the Contractor to designate a concrete truck chute washout area and
to clearly identify that area. Detailed information about the design and maintenance of the Concrete
Washout can be found under the Structural Practices section of this report. At no time should
untreated wash water be allowed to discharge from the site or to enter a storm drain system or
stream. Upon completion of construction activities the concrete washout material shall be removed
and properly disposed of prior to the area being restored.
Any waste material that currently exists on the site or that is generated by construction will be
disposed of in such a manner as to not cause pollutants in stormwater discharges. If waste is to be
stored on-site, it shall be in an area located a minimum of 100 feet from all drainage courses.
Whenever waste is not stored in a non-porous container, it shall be in an area enclosed by a 12-
inch high compacted earthen ridge or some other approved secondary containment device. The area
shall be covered with a non-porous lining to prevent soil contamination. Whenever precipitation is
predicted, the waste shall be covered with a non-porous cover, anchored on all sides to prevent its
removal by wind, in order to prevent precipitation from leaching out potential pollutants from the
waste. On-site waste disposal practices, such as dumpsters, should be covered or otherwise
contained as to prevent dispersion of waste materials from wind. It shall also be the responsibility
of the Contractor to maintain a clean jobsite as to prevent dispersion of waste material and potential
pollutants into adjacent properties or waterways.
The location of, and protective measures for, temporary restroom facilities shall be the responsibility
of the SWMP Administrator.
3.10 Groundwater and Stormwater Dewatering
The BMPs selected for construction dewatering vary depending on the site-specific features, such as
soils, topography, discharge quantities, and discharge location. Typically, dewatering involves
pumping water from an inundated area to a BMP, prior to the water being released downstream
into a receiving waterway, sediment basin, or well-vegetated area. Acceptable BMPs included
discharging water into a sediment trap or basin, using a dewatering filter bag, or using a series of
sediment logs. A settlement tank or an active treatment system can also be utilized. Another
commonly used method to handle the pumped water is the “sprinkler method,” which involves
applying the water to vegetated areas through a perforated discharge hose. Dispersal from a water
truck for dust control can also be used to disperse the pumped water.
4.0 Final Stabilization and Long-Term Stormwater Management
4.1 Final Stabilization
All disturbed areas will be seeded, crimped and mulched or sod in accordance to an approved
Landscaping Plan. As defined by the Colorado Department of Public Health and Environment in
the General Permit Application for Stormwater Discharges, “Final stabilization is reached when all
soil disturbing activities at the site have been completed, and uniform vegetative cover has been
Arrowhead Cottages
Stormwater Management Plan 12
established with a density of at least 70 percent of pre-disturbance levels or equivalent permanent,
physical erosion reduction methods have been employed.”
4.2 Long-Term Stormwater Management
The method of long-term stormwater management will take place within the paver section before
being discharged into the Dixon Canyon Lateral. All disturbed areas will receive permanent paving
or will be vegetated per and approved Landscaping Plan.
5.0 Inspection, Maintenance and Record Keeping
5.1 BMP Inspection
All temporary erosion control facilities shall be inspected at a minimum of once every two (2) weeks
and after each significant storm event or snowmelt. Repairs or reconstruction of BMPs, as
necessary, shall occur as soon as possible in order to ensure the continued performance of their
intended function. It is the responsibility of the SWMP Administrator to conduct bi-weekly
inspections, maintain BMPs if needed, to keep records of site conditions and inspections, and to
update the SWMP as necessary.
The construction site perimeter, disturbed areas, all applicable/installed erosion and sediment
control measures, and areas used for material storage that are exposed to precipitation shall be
inspected for evidence of, or the potential for, pollutants entering the drainage system. Erosion and
sediment control measures identified in the SWMP shall be observed to ensure that they are
operating correctly. Particular attention should be paid to areas that have a significant potential for
stormwater pollution, such as demolition areas, concrete washout locations, and vehicle entries to
the site. The inspection must be documented to ensure compliance with the permit requirements.
5.2 BMP Maintenance
Any BMP’s not operating in accordance with the SWMP must be addressed as soon as possible,
immediately in most cases, to prevent the discharge of pollutants. If modifications are necessary,
such modifications shall be documented so that the SWMP accurately reflects on-site conditions.
The SWMP needs to accurately represent field conditions at all times.
Uncontrolled releases of mud, muddy water, or measurable amounts of sediment found off-site will
be recorded with a brief explanation of the measures taken to clean-up the sediment that has left
the site, as well as the measures taken to prevent future releases. This record shall be made
available to the appropriate public agencies (Colorado Department of Public Health and
Environment, Water Quality Control Division; Environmental Protection Agency; City of Fort Collins;
etc.) upon request.
Preventative maintenance of all temporary and permanent erosion control BMPs shall be provided
in order to ensure the continued performance of their intended function. Temporary erosion control
measures are to be removed after the site has been sufficiently stabilized as determined by the City
of Fort Collins. Maintenance activities and actions to correct problems shall be noted and recorded
during inspections.
Inspection and maintenance procedures specific to each BMP identified with this SWMP are
discussed in Section 3. Details have also been included with Appendix B.
5.3 Record Keeping
Documentation of site inspections must be maintained. The following items are to be recorded and
kept with the SWMP:
Arrowhead Cottages
Stormwater Management Plan 13
• Date of Inspection
• Name(s) and title(s) of personnel making the inspection
• Location(s) of sediment discharges or other pollutants from the site
• Location(s) of BMP’s that need to be maintained
• Location(s) of BMP’s that failed to operate as designed or proved inadequate
• Locations(s) where additional BMP’s are needed that were not in place at the time of inspection
• Deviations from the minimum inspection schedule
• Descriptions of corrective action taken to remedy deficiencies that have been identified
• The report shall contain a signed statement indicating the site is in compliance with the permit to the
best of the signer’s knowledge and belief after corrective actions have been taken.
Provided within Appendix E of this SWMP is an Example Inspection Log to aid in the record keeping
of BMP inspections and maintenance. Photographs, field notebooks, drawings and maps should be
included by the SWMP Administrator when appropriate.
In addition to the Inspection Log, records should be kept documenting:
• BMP maintenance and operation
• Stormwater contamination
• Contacts with suppliers
• Notes on the need for and performance of preventive maintenance and other repairs
• Implementation of specific items in the SWMP
• Training events (given or attended)
• Events involving materials handling and storage
• Contacts with regulatory agencies and personnel
• Notes of employee activities, contact, notifications, etc.
Records of spills, leaks, or overflows that result in the discharge of pollutants must be documented
and maintained. A record of other spills that are responded to, even if they do not result in a
discharge of pollutants, should be made. Information that should be recorded for all occurrences
includes the time and date, weather conditions, reasons for the spill, etc. Some spills may need to
be reported to authorities immediately. Specifically, a release of any chemical, oil, petroleum
product, sewage, etc., which may enter waters of the State of Colorado (which include surface
water, ground water and dry gullies or storm sewers leading to surface water) must be reported to
the CDPHE.
Additionally, the “Dynamic Site Plan” is intended to be a “living” document where the SWMP
Administrator can hand write the location of BMPs as they are installed to appropriately reflect the
current site conditions. Also on the “Dynamic Site Plan” is a “Table of Construction Sequence and
BMP Application/Removal” that the SWMP Administrator can use to document when BMPs were
installed or removed in conjunction with construction activities. These items have been included as
an aid to the SWMP Administrator, and other methods of record keeping are at his or her discretion.
This Stormwater Management Plan (both the text and map) is not a static document. It
is a dynamic device intended to be kept current and logged as construction takes place.
It shall be the responsibility of the SWMP Administrator and/or the permit holder (or
applicant thereof) to ensure the plan is properly maintained and followed. Diligent
administration is critical, including processing the Notice to Proceed and noting on the
Stormwater Management Plan the dates that various construction activities occur and
respective BMPs are installed and/or removed.
Arrowhead Cottages
Stormwater Management Plan 14
6.0 Additional SWMP and BMP Resources
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual - Volume 3 “Best Management Practices”
Website: http://www.udfcd.org/downloads/down_critmanual_volIII.htm
Colorado Department of Transportation
Erosion Control and Stormwater Quality Guide
BMP Field Academy
Website: http://www.coloradodot.info/programs/environmental/water-quality/documents/erosion-storm-quality
EPA Menu of BMP’s
Construction Site Storm Water Runoff Control
Website: http://water.epa.gov/polwaste/npdes/swbmp/Construction-Site-Stormwater-Run-Off-Control.cfm
International Stormwater Best Management (BMP) Database
Rocky Mountain Education Center
Website: http://www.bmpdatabase.org/
Rocky Mountain Education Center
Red Rocks Community College, Lakewood
Website: http://www.rmecosha.com/
Keep It Clean Partnership
Boulder
Website: http://www.keepitcleanpartnership.org/
Arrowhead Cottages
Stormwater Management Plan 15
References
1. Final Drainage and Erosion Control Report for Centre Avenue Residences, Northern
Engineering Services, October 13, 2009 (NE Project No. 110-034)
2. Soil Resource Report for Larimer County Area, Colorado, Natural Resources
Conservation Service, United States Department of Agriculture.
3. Urban Storm Drainage Criteria Manual, Volumes 1-3, Urban Drainage and Flood Control
District, Water Resources Publications, LLC., Denver, Colorado, Updated November
2010.
APPENDIX A
SITE MAPS
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APPENDIX B
EROSION CONTROL DETAILS
A A
PLAN VIEW
SECTION A-A
Sheet
Of 16 Sheets
ARROWHEAD COTTAGES These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
200 South College Avenue, Suite 010
Fort Collins, Colorado 80524
ENGINEER ING
N O R T H E RN
PHONE: 970.221.4158 FAX: 970.221.4159
www.northernengineering.com
EC2
EROSION CONTROL DETAILS
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
Call before you dig.
R
City Engineer Date
Date
Date
Date
Date
Stormwater Utility
Parks & Recreation
Traffic Engineer
Date
Water & Wastewater Utility
City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
Environmental Planner
VEHICLE TRACKING CONTROL PAD SHALL BE LOCATED AT EVERY ACCESS POINT TO THE CONSTRUCTION SITE.
A SIGN SHALL BE PLACED NEXT TO THE VEHICLE TRACKING CONTROL PAD TO DESIGNATE THE LOCATION AS THE CONSTRUCTION ENTRANCE/EXIT.
VEHICLE TRACKING CONTROL (VTC) PADS SHALL CONSIST OF HARD, DENSE, DURABLE ROCK, ANGULAR IN SHAPE AND RESISTANT TO WEATHERING. ROUNDED STONE
SHALL NOT BE USED, i.e., RIVER ROCK AND COBBLES. THE ROCK SHALL BE A MINIMUM OF 3" AND A MAXIMUM OF 6" DIAMETER. THE ROCK SHALL HAVE A SPECIFIC
GRAVITY OF AT LEAST 2.6. CONTROL OF GRADATION WILL BE BY VISUAL INSPECTION. NOTE: OTHER MATERIALS, i.e., ROADBASE, MUD MATS, ETC., MAY BE USED IN
PLACE OF ROCK UPON WRITTEN APPROVAL OF THE CITY INSPECTOR.
ANY CRACKED OR DAMAGED CURB AND GUTTER AND SIDEWALK SHALL BE REPLACED BY CONTRACTOR.
INSTALLATION NOTES:
1.
2.
3.
4.
CONTRACTOR SHALL INSPECT VEHICLE TRACKING CONTROL PAD DAILY. ROCK SURFACE SHALL BE CLEAN AND LOOSE ENOUGH TO RUT SLIGHTLY UNDER WHEEL
LOADS AND CAUSE LOOSE ROCK TO DISLODGE MUD FROM TIRES. WHEN ROCK BECOMES COMPACTED OR FILLED WITH SEDIMENT SO THAT THE EFFECTIVENESS OF
THE PAD IS DIMINISHED, CONTRACTOR SHALL RIP, TURN OVER, OR OTHERWISE LOOSEN ROCK, PLACE ADDITIONAL NEW ROCK, OR REPLACE WITH NEW ROCK AS
NECESSARY TO RESTORE EFFECTIVENESS.
SEDIMENT AND OTHER MATERIAL SPILLED, DROPPED OR TRACKED ONTO PAVED SURFACES SHALL BE REMOVED IMMEDIATELY OR BY THE END OF EACH WORKING
APPENDIX C
LANDSCAPE PLAN
MDJ
BSP
CBS
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APPENDIX D
COPIES OF PERMITS/APPLICATIONS
APPENDIX E
INSPECTION LOGS
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APPENDIX F
EROSION CONTROL ESCROW ESTIMATE
Project: Disturbed Acres: 1.06
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
L.F. 620 $1.85 $1,147.00
each 4 $220.00 $880.00
each 10 $300.00 $3,000.00
each 1 $500.00 $500.00
each 1 $400.00 $400.00
each 4 $25.00 $100.00
each 1 $1,200.00 $1,200.00
L.F. 225 $0.50 $112.50
per hour 30 $70.00 $2,100.00
Sub-Total: $9,439.50
1.5 x Sub-Total: $14,159.25
Amount of security: $14,159.25
Total Acres x Price/acre: $893.05
$842.50 Sub-Total: $893.05
1.5 x Sub-Total: $1,339.58
Amount to Re-seed: $1,339.58
Minimum escrow amount: $3,000.00
Erosion Control Escrow: $14,159.25
Miniumum Escrow Amount
Final Escrow Amount
“The amount of the security must be based on one and one-half times the estimate of the cost to install the approved measures, or one and one-half times the cost to re-vegetate
the disturbed land to dry land grasses based upon unit cost determined by the City's Annual Revegetation and Stabilization Bid, whichever is greater. In no instance, will the
amount of security be less than one thousand five hundred dollars ($1,500) for residential development or three thousand dollars ($3,000) for commercial development”
Sawcutting Pollution Prevention
Street Sweeping and Cleaning
(add all other BMPs for the site in this list)
Reseeding Amount
Unit Price of Seeding per acre:
Vehicle Tracking Control Pad
Example Erosion and Sediment Control Escrow/Security Calculation for
Arrowhead Cottages
BMP Amount
Silt Fence
Rock Sock
Curb Inlet Protection
Drop Inlet Protection
Concrete Washout Area
Detention Pond Outfall Protection
APPENDIX G
CONTRACTOR INSERTS
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ST ST
E E
E E E
E
E
E E E
E
E E
E
W
W
W
W
W
W
W
W
W W
W
W
W
W
W
W
W
W W W
W W W
W
W
W
W W
CONTROL
IRR
F
E
S
S
h2o
H2O
C
S
W
WV
H
Y
D
WV
S
S C.O. C.O.
C.O.
C.O.
WV
H2OW
ST
ST ST ST
ST
ST
ST ST
ST
ST
ST
W W
D
D
D
D
ST
ST
ST
MDJ
MDJ
GATHERING
AREA
SANDSTONE BENCHES
NATURAL HABITAT
BUFFER ZONE
PER APPROVED MINOR
AMMENDMENTS PHASE 1 PLANS
RAIN GARDEN
CENTRE AVENUE
WORTHINGTON CIRCLE
3 UNIT RANCH BUILDING
6 UNIT 2 STORY BUILDING
4 DETACHED
GARAGES
EXISTING BUILDING
TRACT A
SANDSTONE BENCHES
SANDSTONE BENCHES
BSP
CBS
CBS
ELECTRIC METER LOCATION
ELECTRIC METER LOCATION
FORT COLLINS, CO
ARROWHEAD
COTTAGES
GROUP
landscape architecture|planning|illustration
444 Mountain Ave.
Behtroud,CO 80513
TEL
WEB
970.532.5891
TBGroup.us
PROJECT TITLE
REVISIONS
ISSUE DATE
SHEET TITLE
SHEET INFORMATION
DATE
SEAL
January 27, 2016
DATE
PREPARED FOR
LANDMARK
REAL ESTATE
HOLDINGS LLC
1170 W Ash St # 100
Windsor, CO 80550-4783
(970) 460-0567
CONTACT: Jason Sherrill
MAJOR AMENDMENT
COMMENTS 2/17/16
COMMENTS 4/12/16
COMMENTS 5/6/16
Plant List
Landscape Legend
SCALE 1" = 20'-0"
0 20' 30' 40' NORTH
Landscape Plan
Landscape Plan
LS 2
A FREE PERMIT MUST BE OBTAINED FROM THE CITY FORESTER BEFORE ANY STREET TREES ARE PLANTED IN PARKWAYS BETWEEN THE SIDEWALK
AND CURB AND IN STREET MEDIANS. STREET TREE LOCATIONS AND NUMBERS MAY CHANGE TO MEET ACTUAL UTILITY/TREE SEPARATION
STANDARDS. LANDSCAPE CONTRACTOR MUST OBTAIN APPROVAL OF STREET TREE LOCATIONS AFTER UTILITY LOCATES. STREET TREES MUST BE
INSPECTED AND APPROVED BEFORE PLANTING. FAILURE TO OBTAIN THIS PERMIT IS A VIOLATION OF THE CODE OF THE CITY OF FORT COLLINS.
Gleditsia triacanthos inermis
Size: 9"
Mitigation: 1
Gleditsia triacanthos inermis
Size: 11"
Mitigation: 1
Gleditsia triacanthos inermis
Size: 12"
Mitigation: 1
Gleditsia triacanthos inermis
Size: 9"
Mitigation: 2
Gleditsia triacanthos inermis
Size: 10"
Mitigation: 2
Gleditsia triacanthos inermis
Size: 11"
Mitigation: 2
Gleditsia triacanthos inermis
Size: 16"
Mitigation: 2
NOTE: PLEASE SEE SECTION 3.4.1 OF THE LAND USE CODE FOR
ALLOWBALE USES WITHIN THE BUFFER ZONE. THE NHBZ IS MEANT
TO BE MAINTAINED IN A NATIVE LANDSCAPE
Note: Proposed upsized mitigation trees/size marked with *. Existing mitigation trees listed
on plan. 13 Trees to be upsized per the mitigation requirements from Arrowhead Phase 1
Minor Ammendment
6"-8" WASHED RIVER COBBLE
OVER FABRIC BARRIER
(MOD. HYDROZONE)
IRRIGATED DURA TURF TYPE
TALL FESCUE SOD
(MOD. HYDROZONE)
5" DEPTH SHREDDED CEDAR
MULCH OVER FABRIC BARRIER
(MOD. HYDROZONE)
RAIN GARDEN GRASS SEED
MIX
NATIVE GRASS
(VERY LOW HYDROZONE)
ROLLED TOP METAL EDGING
SANDSTONE BENCHES
NATURAL HABITAT BUFFER ZONE
TALL FESCUE SEED MIX
BOUNDARY OF PROPOSED
LANDSCAPE
STREET LIGHT EXISTING
PROPOSED STREET LIGHT
LOCATION PER PHOTOMETRIC PLANS
TRANSFORMER
TRANSFORMER
DAY.
VEHICLE TRACKING CONTROL PAD SHALL BE REMOVED AT THE END OF CONSTRUCTION. THE AREA SHOULD BE TOPSOILED, SEEDED, CRIMPED, AND MULCHED OR
OTHERWISE STABILIZED.
MAINTENANCE NOTES:
1.
2.
3.
3" - 6" ROCK
CONSTRUCTION FENCE, TYP., TO DISCOURAGE
VEHICLE ACCESS EXCEPT AT VTC
SIGN "CONSTRUCTION ENTRANCE"
R=5'
PAVED SURFACE
20' MIN.
3" - 6" ROCK
NO MATERIALS INCLUDING 2x4'S, PIPES,
DIRT, GRAVEL OR ASPHALT, SHALL BE
PLACED IN GUTTER TO FACILITATE
MOUNTING CURB; HOWEVER, CURB MAY BE
CUT DOWN TO A HEIGHT OF 2" OR HIGHER
FOR EASIER ACCESS AND REPLACED AT
PROJECT COMPLETION. OTHER ACCESS
DEVICES MAY BE USED AS ACCEPTED BY
THE CITY.
CURB CUT
50' MIN.
2" MIN. 6" MIN.
6" MIN.
ALTHOUGH NOT NORMALLY USED, THE CITY RESERVES THE RIGHT TO REQUIRE VEHICLE TRACKING CONTROL WITH A TEMPORARY CATTLE GUARD
AND/OR WHEEL WASH FACILITIES AT SITES WHERE TRACKING ONTO PAVED AREAS BECOMES A SIGNIFICANT PROBLEM AS DETERMINED BY THE CITY
INSPECTOR.
IF VEHICLE TRACKING CONTROL WITH WHEEL WASH FACILITIES ARE REQUIRED, ALL WHEELS ON EVERY VEHICLE LEAVING THE SITE SHALL BE
CLEANED OF MUD USING A PRESSURE-WASHER. THE CONTRACTOR SHALL BE RESPONSIBLE FOR OBTAINING A WATER SOURCE AND CONSTRUCTING
A WASHWATER SEDIMENT TRAP.
5.
6.
IF VEHICLE WHEEL WASH FACILITIES ARE REQUIRED, CONTRACTOR SHALL INSPECT VEHICLE TRACKING CONTROL AND WHEEL WASH FACILITIES DAILY.
ACCUMULATED SEDIMENTS SHALL BE REMOVED FROM THE PAD SURFACE.
ACCUMULATED SEDIMENT IN THE WASHWATER/SEDIMENT TRAP SHALL BE REMOVED WHEN THE SEDIMENT REACHES AN AVERAGE DEPTH OF 12-INCHES.
4.
5.
COMPACTED BACKFILL
FLOW
SILT FENCE FABRIC (ASTM D6461) ANCHORED IN
TRENCH AND ATTACHED TO POST.
24" MIN
6' MAX
FLOW
TRENCH AND ATTACHED TO POST.
4"x4" TRENCH
SILT FENCE FABRIC (ASTM D6461) ANCHORED IN
18" MIN
24" MIN
42" MIN
POSTS
JOIN FIRST
ROTATE SECOND
POSTS SHALL OVERLAP
AT JOINTS SO THAT NO
GAPS EXIST IN SILT FENCE.
NOTE:
THICKNESS OF GEOTEXTILE
POST SHALL BE JOINED AS SHOWN, THEN HAS BEEN EXAGGERATED.
ROTATED 180° IN DIRECTION SHOWN AND
DRIVEN INTO THE GROUND.
DRIVE POSTS VERTICALLY INTO THE GROUND TO A MINIMUM DEPTH OF 18".
EXCAVATE A TRENCH APPROXIMATELY 4" WIDE AND 4" DEEP ALONG THE LINE OF POSTS AND
UPSLOPE FROM THE BARRIER.
ANCHOR TRENCH SHALL BE EXCAVATED BY HAND, WITH TRENCHER, OR WITH SILT FENCE
INSTALLATION MACHINE. NO ROAD GRADERS, BACKHOES, ETC. SHALL BE USED.
NOT LESS THAN THE BOTTOM 1' OF THE SILT FENCE FABRIC SHALL BE BURIED IN THE TRENCH.
THE TRENCH SHALL BE COMPACTED BY HAND, WITH "JUMPING JACK" OR BY WHEEL ROLLING.
COMPACTION SHALL BE SUCH THAT THE SILT FENCE RESISTS BEING PULLED OUT OF ANCHOR
TRENCH BY HAND.
SILT FENCE INDICATED IN THE PLANS SHALL BE INSTALLED PRIOR TO ANY LAND-DISTURBING
ACTIVITIES.
USE WOOD POSTS OR OTHER MATERIAL AS ACCEPTED BY THE CITY.
INSTALLATION NOTES:
1.
2.
3.
4.
5.
6.
7.
THE CONTRACTOR SHALL INSPECT SILT FENCE EVERY TWO WEEKS AND AFTER SIGNIFICANT STORM
EVENTS AND MAKE REPAIRS OR CLEAN OUT UPSTREAM SEDIMENT AS NECESSARY.
SEDIMENT ACCUMULATED UPSTREAM OF SILT FENCE SHALL BE REMOVED WHEN THE UPSTREAM
SEDIMENT REACHES A DEPTH OF 6".
SILT FENCE SHALL BE REMOVED WHEN THE UPSTREAM DISTURBED AREA IS STABILIZED AND GRASS
COVER IS ACCEPTED BY THE CITY. IF ANY DISTURBED AREA EXISTS AFTER REMOVAL, IT SHALL BE
SEEDED AND MULCHED OR OTHERWISE STABILIZED IN A MANNER ACCEPTED BY THE CITY.
MAINTENANCE NOTES:
1.
2.
3.
4" MIN.
4" MIN.
1 1
2" x 1 1
2" WOODEN FENCE POSTS
COMPACTED BACKFILL
401 VEHICLE TRACKING CONTROL PAD 402 CONCRETE WASHOUT AREA
VTC CWA 403 SILT FENCE
SF
SF
INLET PROTECTION - AREA INLET IN SUMP
Urban Drainage and Figure C5-21
Flood Control District
Drainage Criteria Manual (V.3)
AREA INLET - PLAN
SECTION A ROCK FILTER JOINT DETAIL
INLET PROTECTION CONTINUED
1-1/2" CRUSHED
ROCK ENCLOSED
IN WIRE MESH
FILTERED
RUNOFF
AREA INLET
10' MIN.
2" IN SOIL
0" ON PAVEMENT
12" 12"
ANY GAP AT JOINT SHALL BE FILLED
WITH 1 1/2" CRUSHED ROCK AND
WRAPPED WITH ADDITIONAL WIRE
MESH SECURED TO ENDS OF ROCK
REINFORCED BERM
SEE JOINT DETAIL,
THIS SHEET
A
AREA INLET
(TYPE C SHOWN)
REINFORCED ROCK
BERM SEE SB DETAIL
5. REINFORCED ROCK BERM SHALL BE CONSTRUCTED IN ONE PIECE OR SHALL BE CONSTRUCTED USING JOINT DETAIL.
ON ENDS OF BERM.
4. WIRE MESH SHALL BE SECURED USING "HOG RINGS" OR WIRE TIES AT 6-INCH CENTERS ALONG ALL JOINTS AND AT 2-INCH CENTERS
"CHICKEN WIRE"). ROLL WIDTH SHALL BE 48-INCHES.
3. WIRE MESH SHALL BE FABRICATED OF 10 GAUGE WIRE TWISTED INTO A MESH WITH A MAXIMUM OPENING OF 1.0 INCH (COMMONLY TERMED
MINUS). RECYCLED CONCRETE MEETING THIS GRADATION MAY BE USED.
2. CRUSHED ROCK SHALL BE FRACTURED FACE (ALL SIDES) AND SHALL COMPLY WITH GRADATION SHOWN IN CDOT SECT. 703-2, #4 aggregate (1-1/2"
INLET PROTECTION AFTER INLET CONSTRUCTION OF AFTER PAVEMENT SHALL BE INSTALLED WITHIN
48 HOUR AFTER INLET CONSTRUCTION OR PAVING IS COMPLETED.
1.
INLET PROTECTION INSTALLATION NOTES
INLET PROTECTION MAINTENANCE NOTES
OTHERWISE STABILIZED IN A MANNER APPROVED BY THE LOCAL JURISDICTION.
4. WHEN INLET PROTECTION AT AREA INLETS IS REMOVED, THE DISTURBED AREA SHALL BE COVERED WITH TOP SOIL, DRILL SEEDED AND CRIMP MULCHED, OR
JURISDICTION APPROVES EARLIER REMOVAL OF INLET PROTECTION IN STREETS.
3. INLET PROTECTION IS TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBED AREA IS STABILIZED AND GRASS COVER IS APPROVED, UNLESS THE LOCAL
INCHES OF THE CREST.
2. SEDIMENT ACCUMULATED UPSTREAM OF INLET PROTECTION SHALL BE REMOVED WHEN THE SEDIMENT DEPTH UPSTREAM OF ROCK BERM IS WITHIN 2-1/2
INSPECT FREQUENTLY DURING WINTER CONDITIONS DUE TO FREEZE/THAW PROBLEMS. REPAIRS AS NEEDED.
NECESSARY. MORE
1. THE SWMP MANAGER SHALL INSPECT INLET PROTECTION WEEKLY, DURING AND AFTER ANY STORM EVENT AND MAKE REPAIRS OR CLEAN OUT AS
DETAIL BASED ON DETAILS PROVIDED BY DOUGLAS COUNTY
404 CURB INLET PROTECTION 405
AREA INLET PROTECTION
CIP
IP
406 DETENTION POND OUTFALL PROTECTION
OP
F
E
S
ST
ST ST
ST
ST ST
ST
D
D
D
D
D
CENTRE AVENUE
WORTHINGTON
CIRCLE
EXISTING
STUCCO BUILDING
EXISTING
APARTMENT BUILDING
NEW MERCER DITCH
BLDG 1
BLDG 2
GARAGE
RP
IP
CIP
IP
IP
IP IP
IP
IP
IP
IP
CIP
VTC
IP
CIP
SF
SF
SF
SF
SF
SF
SF
SF
SF
SF
SF SF
SF
SF
SF
SF SF
SF SF SF
SF
SF
CWA
RS RP RS
OP CIP
Sheet
Of 16 Sheets
ARROWHEAD COTTAGES These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
200 South College Avenue, Suite 010
Fort Collins, Colorado 80524
ENGINEER ING
N O R T H E RN
PHONE: 970.221.4158 FAX: 970.221.4159
www.northernengineering.com
EC2
EROSION CONTROL PLAN
DYNAMIC
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what's below.
Call before you dig.
R
NORTH
( IN FEET )
1 inch = ft.
30 0 30 Feet
30
60 90
NOTE:
ALL BMP'S SHOWN ON THIS PLAN ARE GRAPHIC REPRESENTATIONS ONLY.
FINAL DETERMINATION OF SIZE AND LOCATION SHALL BE DETERMINED BY
THE CONTRACTOR AND DOCUMENTED ON THE DYNAMIC SITE PLAN.
1. CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED SLOPES BY CRIMP
MULCHING OR SIMILAR METHODS (AS APPLICABLE).
2. TOTAL DISTURBED AREA = 1.06 ACRES
3. SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone________________________________
4. CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR CONCRETE WASHOUT
AREA IF ACCESS IS OFF PAVEMENT.
5. REFER TO THE "STORM WATER MANAGEMENT PLAN & EROSION CONTROL REPORT FOR
ARROWHEAD COTTAGES" BY NORTHERN ENGINEERING, DATED 06/01/16 FOR
ADDITIONAL INFORMATION.
GENERAL NOTES:
LEGEND:
PROPOSED CONTOUR
EXISTING STORM SEWER
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPOSED STORM INLET
PROPOSED CONCRETE
CROSS PAN (TYP.)
PEDESTRIAN ACCESS RAMPS
VEHICLE TRACKING CONTROL PAD
SILT FENCE
SWALE WATTLE DIKE
INLET PROTECTION
ROCK SOCK
CONCRETE WASHOUT AREA
TEMPORARY BMP'S
SF
LIMITS OF DISTURBANCE
WD
VTC
SF
IP
RS
CWA
CURB INLET PROTECTION CIP
RIPRAP PROTECTION RP
OUTFALL PROTECTION OP
TABLE OF CONSTRUCTION SEQUENCE AND BMP APPLICATION/REMOVAL
Project: Arrowhead Cottages Date: JUNE 1, 2016
Contractor to utilize this table to indicate when construction activities occur and when each associated BMP is installed or removed.
CONSTRUCTION PHASE (Monthly) 1 2 3 4 5 6 7 8 9 10 11 12 Comments
Grading
Overlot
Swales, Drainageways
Pipeline Installation
Water Main
Asphalt and Concrete Installation
Building Structure
Miscellaneous
Hardscape Amenities
BEST MANAGEMENT PRACTICES
Temporary
Contour Furrows and Diversion Dikes (Ripping/Disking)
Inlet Protection (IP)
Vehicle Tracking Control (VTC)
Flow Barriers (Bales, Wattles, Etc) (WD)
Concrete Washout Area (CWA)
Preventative Maintenance Activities/Meetings/ etc.
Permanent
Mulching/Sealant
Permanent Seed Planting
Curb and Gutter
Parking and Drive Aisles
Grass Swale
Scour Stop
Riprap
Water Quality Pond
F
E
S
ST
ST ST
ST
ST ST
ST
D
D
D
D
D
CENTRE AVENUE
WORTHINGTON
CIRCLE
EXISTING
STUCCO BUILDING
EXISTING
APARTMENT BUILDING
NEW MERCER DITCH
BLDG 1
BLDG 2
GARAGE
RP
IP
CIP
IP
IP
IP IP
IP
IP
IP
IP
CIP
VTC
IP
CIP
SF
SF
SF
SF
SF
SF
SF
SF
SF
SF
SF SF
SF
SF
SF
SF SF
SF SF SF
SF
SF
CWA
RS RP RS
OP CIP
Sheet
Of 16 Sheets
ARROWHEAD COTTAGES These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
200 South College Avenue, Suite 010
Fort Collins, Colorado 80524
ENGINEER ING
N O R T H E RN
PHONE: 970.221.4158 FAX: 970.221.4159
www.northernengineering.com
EC1
EROSION CONTROL PLAN
STATIC
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what's below.
Call before you dig.
R
NORTH
( IN FEET )
1 inch = ft.
30 0 30 Feet
30
60 90
NOTE:
ALL BMP'S SHOWN ON THIS PLAN ARE GRAPHIC REPRESENTATIONS ONLY.
FINAL DETERMINATION OF SIZE AND LOCATION SHALL BE DETERMINED BY
THE CONTRACTOR AND DOCUMENTED ON THE DYNAMIC SITE PLAN.
1. CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED SLOPES BY CRIMP
MULCHING OR SIMILAR METHODS (AS APPLICABLE).
2. TOTAL DISTURBED AREA = 1.06 ACRES
3. SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone________________________________
4. CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR CONCRETE WASHOUT
AREA IF ACCESS IS OFF PAVEMENT.
5. REFER TO THE "STORM WATER MANAGEMENT PLAN & EROSION CONTROL REPORT FOR
ARROWHEAD COTTAGES" BY NORTHERN ENGINEERING, DATED 06/01/16 FOR
ADDITIONAL INFORMATION.
GENERAL NOTES:
LEGEND:
PROPOSED CONTOUR
EXISTING STORM SEWER
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPOSED STORM INLET
PROPOSED CONCRETE
CROSS PAN (TYP.)
PEDESTRIAN ACCESS RAMPS
VEHICLE TRACKING CONTROL PAD
SILT FENCE
SWALE WATTLE DIKE
INLET PROTECTION
ROCK SOCK
CONCRETE WASHOUT AREA
TEMPORARY BMP'S
SF
LIMITS OF DISTURBANCE
WD
VTC
SF
IP
RS
CWA
CURB INLET PROTECTION CIP
1. IT SHOULD BE NOTED THAT ANY EROSION CONTROL PLAN SERVES
ONLY AS A GUIDELINE TO THE CONTRACTOR. STAGING AND/OR
PHASING OF BEST MANAGEMENT PRACTICES (BMPs) IS EXPECTED.
ADDITIONAL AND/OR DIFFERENT BMPs FROM THOSE ORIGINALLY
DEPICTED MAY BE NECESSARY DURING CONSTRUCTION DUE TO
CHANGING SITE CONDITIONS OR AS REQUIRED BY LOCAL
AUTHORITIES.
2. THIS EROSION CONTROL PLAN IS SCHEMATIC IN NATURE. AS SUCH,
GRAPHICAL SYMBOLS MAY NOT BE TO SCALE, NOR ARE THEY
NECESSARILY SHOWN IN THEIR EXACT LOCATION.
3. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL PERMITTING
(CITY, STATE DISCHARGE PERMIT, ETC.) AND COMPLIANCE WITH
GOVERNING AUTHORITIES. IT SHALL BE THE RESPONSIBILITY OF
THE CONTRACTOR (OR PERMIT HOLDER) TO ENSURE EROSION
CONTROL MEASURES ARE PROPERLY MAINTAINED AND FOLLOWED.
4. CONTRACTOR SHALL IMPLEMENT THE APPROPRIATE EROSION
CONTROL MEASURES ACCORDING THE THE CONSTRUCTION
SEQUENCING AND LEVEL OF SITE STABILIZATION.
5. CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION
FOR ALL STORM DRAINS, SWALES, PONDS AND RAIN GARDENS UNTIL
SITE IS FULLY STABILIZED.
6. CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION
FOR DOWNSPOUT CONNECTIONS, TO THE STORM DRAIN SYSTEM,
UNTIL CONNECTION IS ESTABLISHED WITH DOWNSPOUT.
7. INLET PROTECTION SHALL BE ADAPTED, AS NECESSARY, TO THE
SURROUNDING SURFACE TYPE AND CONDITION (i.e., STAKE-DRIVEN
WATTLES FOR BARE SOIL, SAND BAGS OR GRAVEL SOCKS FOR
PAVEMENT, ETC.)
8. CONTRACTOR IS RESPONSIBLE FOR STABILIZING ALL SLOPES,
PARTICULARLY THOSE STEEPER THAN 6:1. CRIMP MULCHING,
HYDRO MULCHING, EROSION MATS, TEMPORARY IRRIGATION, AND
ADDITIONAL WATTLES OR SILT FENCING MAY BE NECESSARY TO
ESTABLISH VEGETATIVE COVER AND STABILIZE THE SLOPE.
9. ADDITIONAL WATTLES, SILT FENCE, OR OTHER MEASURES, MAY BE
NECESSARY TO INSURE THAT EACH BUILDING PAD IS STABILIZED
THROUGHOUT CONSTRUCTION. AT NO TIME SHALL SEDIMENT BE
ALLOWED TO CROSS THE PUBLIC SIDEWALKS.
10. CONTRACTOR SHALL IMPLEMENT APPROPRIATE PERIMETER
PROTECTION FOR AREAS DIRECTING DRAINAGE OFFSITE.
PERIMETER PROTECTION SHALL BE ADAPTED, AS NECESSARY, TO
THE SURROUNDING SURFACE TYPE AND CONDITION (i.e.,
STAKE-DRIVEN SEDIMENT CONTROL LOGS OR SILT FENCE FOR BARE
SOIL, SAND BAGS OR GRAVEL SOCKS FOR PAVEMENT, ETC.)
11. FUELING FACILITIES SHALL BE LOCATED AT LEAST ONE HUNDRED
(100) FEET FROM NATURAL BODY OF WATER, WETLAND, NATURAL
DRAINAGE WAY OR MANMADE DRAINAGE WAY. THE FUEL TANKS
AND FUELING AREA MUST BE SET IN A CONTAINMENT AREA THAT
WILL NOT ALLOW A FUEL SPILL TO DIRECTLY FLOW, SEEP, RUN OFF,
OR BE WASHED INTO A BODY OF WATER, WETLAND OR DRAINAGE
WAY.
12. CONSTRUCTION WASTE STORAGE (DUMPSTERS) AND PORTABLE
SANITATION UNITS (CONSTRUCTION TOILETS) SHALL BE LOCATED AT
LEAST FIFTY (50) FEET FROM ANY STORMWATER INLET, WETLAND,
OR DRAINAGE WAY. SAID FACILITIES MUST BE SET IN A
CONTAINMENT AREA THAT WILL NOT ALLOW POLLUTANTS TO
DIRECTLY FLOW, SEEP, RUN OFF, OR BE WASHED INTO A BODY OF
WATER, WETLAND OR DRAINAGE WAY. DUMPSTERS SHALL BE
LOCATED ON FLAT, STABLE GROUND, AND CONSTRUCTION TOILETS
SHALL BE STAKED DOWN.
13. THE CONTRACTOR AND ALL SUBCONTRACTORS WILL COOPERATE
WITH THE CITY'S CONSTRUCTION INSPECTORS BY CEASING
OPERATIONS WHEN WINDS ARE OF SUFFICIENT VELOCITY TO
CREATE BLOWING DUST WHICH, IN THE INSPECTOR'S OPINION, IS
HAZARDOUS TO THE PUBLIC HEALTH AND WELFARE.
14. WHERE SEASONAL CONSTRAINTS (E.G., DURING SUMMER AND
WINTER MONTHS) INHIBIT PERMANENT SEEDING OPERATIONS,
DISTURBED AREAS WILL BE TREATED WITH MULCH AND MULCH
TACKIFIER OR OTHER MATERIALS APPROVED BY EROSION CONTROL
STAFF TO PREVENT EROSION.
15. SEE LANDSCAPE PLANS FOR ADDITIONAL INFORMATION ON
PLANTING, REVEGETATION, HARDSCAPE AND OTHER PERMANENT
SITE STABILIZATION METHODS.
16. ALL ROOF DRAIN SYSTEM INLETS SHAL BE PLUGGED UNTIL
CONNECTED TO BUILDINGS.
EROSION CONTROL NOTES:
TABLE OF CONSTRUCTION SEQUENCE AND BMP APPLICATION
Project: ARROWHEAD COTTAGES
CONSTRUCTION PHASE MOBILIZATION DEMOLITION GRADING
BEST MANAGEMENT PRACTICES (BMPS)
STRUCTURAL "INSTALLATION"
Silt Fence Barriers *
Flow Barriers (Wattles) *
Inlet Filter Bags *
Vegetative
Temporary Seeding Planting
Mulching / Sealant
Permanent Seeding Planting
Sod Installation
Rolled Products : Netting / Blankets / Mats
Contour Furrows (Ripping / Disking)
Rock Bags *
UTILITIES
INSTALLATION
FLAT WORK
INSTALLATION
VERTICAL
INSTALLATION LANDSCAPE DEMOBILIZATION
Vehicle Tracking Pad *
* All Temporary BMPs to be Removed once Construction is Complete
Any prior inlets that could use protecting
Any prior inlets that could use protecting
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
RIPRAP PROTECTION RP
OUTFALL PROTECTION OP