HomeMy WebLinkAboutBDR FOUR-PLEX, 621 S. MELDRUM ST. - FDP130002 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT (3)February 20, 2013
EROSION CONTROL REPORT
BIG DEAL FOUR PLEX
Fort Collins, Colorado
Prepared for:
Big Deal Real Estate Inc.
2519 Ridge Creek Road
Fort Collins, CO 80528
Prepared by:
200 South College Avenue, Suite 10
Fort Collins, Colorado 80524
Phone: 970.221.4158 Fax: 970.221.4159
www.northernengineering.com
Project Number: 876-001
3 This 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.
February 20, 2013
City of Fort Collins
Stormwater Utility
700 Wood Street
Fort Collins, CO 80521
RE: Erosion Control Report for Big Deal Four Plex
Dear Staff,
Northern Engineering Services, Inc. is pleased to submit this Erosion Control Report (ECR) for Big Deal Four
Plex. The objectives of this Erosion Control Report (ECR) are to identify potential sources of pollution resulting
from the construction activity associated with the site improvements described herein and recommend Best
Management Practices (BMPs) that can be used to reduce or eliminate the likelihood of these pollutants
entering stormwater discharges from the site.
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.
Herman Feissner, P.E.
Project Engineer
Big Deal Four Plex
Stormwater Management Plan
TABLE OF CONTENTS
Vicinity Map
1.0 General Requirements..............................................................................................1
1.1 Objectives...............................................................................................................1
1.2 Definitions ..............................................................................................................1
2.0 Narrative Site Description .........................................................................................2
2.1 Existing Site Description ............................................................................................2
2.2 Wind and Rainfall Erodibility .....................................................................................2
2.3 Nature of Construction Activity ...................................................................................2
2.4 Sequence of Major Activities ......................................................................................2
2.5 Site Disturbance ......................................................................................................2
2.6 Existing Data...........................................................................................................3
2.7 Potential Pollution Sources ........................................................................................3
2.8 Receiving Waters .....................................................................................................3
Figure 1 – Existing Drainage and Irrigation Infrastructure .....................................................................4
3.0 Stormwater Management Controls .............................................................................5
3.1 Best Management Practices (BMPs) for Stormwater Pollution Prevention ..........................5
3.2 Structural Practices for Erosion and Sediment Control ....................................................5
3.3 Non-Structural Practices for Erosion and Sediment Control .............................................7
3.4 Phased BMP Installation ...........................................................................................7
3.5 Material Handling and Spill Prevention ........................................................................8
3.6 Waste Management and Disposal ...............................................................................8
4.0 Final Stabilization and Long-Term Stormwater Management ....................................... 10
4.1 Final Stabilization .................................................................................................. 10
4.2 Long-Term Stormwater Management ......................................................................... 10
5.0 Inspection and Maintenance ................................................................................... 11
4.3 BMP Inspection ..................................................................................................... 11
4.4 BMP Maintenance ................................................................................................. 11
References 12
Big Deal Four Plex
Stormwater Management Plan
LIST OF TABLES:
Table 1 – Construction Schedule ........................................................................................... 5
APPENDICES:
APPENDIX A – Grading and Erosion Control Plan
APPENDIX B – Erosion Control Details
APPENDIX C – Landscape Plan
Big Deal Four Plex
Erosion Control Report 1
1.0 General Requirements
1.1 Objectives
The objectives of this Erosion Control Report (ECR) are to identify potential sources of pollution
resulting from construction activity associated with the site improvements described herein and
recommend Best Management Practices (BMPs) that can be used to reduce the pollutants in
stormwater discharges from the site. The ECR must be completed and implemented at the time the
project breaks ground and revised as necessary, while construction proceeds, to accurately reflect
the conditions and practices at the site.
1.2 Definitions
Best Management Practices (BMPs) – BMPs encompass a wide range of erosion and sediment
control practices, both structural and non-structural in nature, which are intended to reduce or
eliminate potential water quality impacts from construction site stormwater runoff.
Erosion Control BMPs – These practices are intended to prevent the erosion of soil. A few common
examples include: minimizing the amount of disturbed area through phasing, temporary
stabilization and preserving existing vegetation.
Sediment Control BMPs – These practices are designed to remove sediment from runoff. Examples
of few include: straw wattles, silt fence and inlet protection.
Non-structural BMPs – These BMPs prevent or limit the entry of pollutants into stormwater at their
source through operational or managerial techniques. Some examples include: the preservation of
natural vegetation, preventive maintenance and spill response procedures.
Structural BMPs – Structural practices are designed to control on-site erosion and prevent sediment
from migrating within the project site as well as off-site during construction. This type of BMP
includes physical processes ranging from diversion structures to inlet protection and silt fence.
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Erosion Control Report 2
2.0 Narrative Site Description
2.1 Existing Site Description
The project site is located in the Northeast Quarter of Section 14, Township 7 North, Range 69
West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, State of Colorado. More
specifically, the project is located at 621 South Meldrum Street. The project site is bordered to the
north and south by single-family homes; to the east by Meldrum Street (100' Right-of-Way); and to
the west by an existing alley (20' Right-of-Way).
The existing site improvements include: one single-family home which fronts to Meldrum Street, a
detached garage and a small shed. The existing ground cover consists of several mature trees,
grass, weeds and bare soil.
2.2 Wind and Rainfall Erodibility
The site is located within a moderate risk Erodibility Zone per the City of Fort Collins Wind
Erodibility Map. According to the Natural Resources Conservation Service website -
www.websoilsurvey.nrcs.usda.gov, the applicable soil erosion factor (K), which indicates the susceptibility
of a soil to sheet and rill erosion, is 0.28. This value is indicative of soils moderately susceptible to
rainfall erosion.
Impervious area (i.e., roof area, concrete walks and asphalt parking area) and landscaping will
permanently stabilize the areas disturbed by the proposed construction activity; therefore, the
likelihood of erosion and sediment problems occurring on-site is minimal. Most of the proposed
landscaped area is situated between the proposed structure and asphalt parking area). 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 Big Deal Four Plex project will include a two-story building with four units and a
footprint of approximately 2570 sq. ft. The other major proposed improvements include: a new
asphalt parking area and updated landscaping.
2.4 Sequence of Major Activities
To complete the project, many basic construction activities will take place. The project will begin by
removing the existing site improvements such as the existing single-family home. The installation,
removal/replacement, or re-routing of existing utilities (e.g., electric, gas, sanitary sewer, domestic
water and storm drain) will occur next. While building foundations are being constructed, concrete
barrier curbs will be installed around the parking area. The asphalt paving in the parking area will
likely follow completion of exterior construction. The fine grading of the landscaped areas and the
installation of retaining walls and landscaping will mark the completion of the construction
activities.
2.5 Site Disturbance
The project site is approximately 0.22 acre in size. The area that will be disturbed by construction
activity is 0.22 acre.
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Erosion Control Report 3
2.6 Existing Data
In order to complete the associated construction plans, a topographical survey of the site was
completed. The survey consisted of field measurements made by Northern Engineering Services,
Inc. in November 2012.
The site-specific subsurface exploration was performed by Soilogic, Inc. Detailed results from this
work are contained in the Geotechnical Subsurface Exploration Proposed Multi-Family 4-plex
Residence 621 South Meldrum Street Fort Collins, Colorado (Soilogic Project # 12-1094) dated
November 28, 2012.
2.7 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 the materials that will be
used or stored on the construction site. It is the sole responsibility of the contractor to identify and
properly handle materials that are potential pollution sources. The following are some common
examples of potential pollution sources:
x Exposed and stored soils
x Vehicle tracking of sediments
x Management of contaminated soils
x Outdoor storage of building materials, fertilizers, chemicals, etc.
x Vehicle and equipment maintenance and fueling
x Significant dust or particulate generating processes
x Routine maintenance activities involving fertilizers, pesticides, detergents, fuels,
solvents, oils, etc.
x On-site waste disposal practices (waste piles, dumpsters, etc.)
x Concrete truck/equipment washing, including the concrete truck chute and
associated fixtures and equipment
x Dedicated asphalt and concrete batch plants
x Non-industrial waste sources such as worker trash and portable toilets
x Other areas or procedures where potential spills can occur
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.
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 parking garage drive aisle
entrance and Bluebell Street. The contractor will be responsible for the proper handling and
management of pollution sources during loading and unloading operations.
Dedicated Asphalt and Concrete Batch Plants: Neither a dedicated asphalt or concrete batch plant
will be constructed on-site.
2.8 Receiving Waters
The excess stormwater runoff from the project area generally sheet flows to existing stormwater
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infrastructure along well established drainage paths. More specifically, the excess runoff from
disturbed area on the east side of the project site enters the curb and gutter in Meldrum Street and
flows north to an existing combination inlet (refer to Figure 1). This inlet is connected to an existing
storm drain system that outfalls into the Udall Natural Area. Stormwater flows from downtown and
nearby neighborhood storm drains flow into this system, which drains into a series of ponds (i.e.,
Udall Natural Area), before entering the Poudre River. Excess runoff from west portion of the project
site will flow into the Arthur Ditch.
Figure 1 – Existing Drainage and Irrigation Infrastructure
Project
Site
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Erosion Control Report 5
3.0 Stormwater Management Controls
3.1 Best Management Practices (BMPs) for Stormwater Pollution Prevention
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.
Starting with mobilization, and throughout the entire construction of the buildings, erosion control
devices should be installed and maintained to minimize pollutant migration. The BMPs may be
installed or implemented 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.
Table 1 (see below) depicts the construction sequence and associated BMPs. The Erosion Control
Static Site Plan (Refer to sheet C6.00 in Appendix A) illustrates the assumed location for each of
the BMPs. Details for recommended BMPs are included in Appendix A. These details should be
used for additional information on installation and maintenance of BMPs described herein.
3.2 Structural Practices for Erosion and Sediment Control
Structural BMPs are physical devices that prevent or minimize water quality impacts associated
with construction site stormwater runoff. These devices can be temporary or permanent, and the
installation of individual components will vary depending on the stage of construction.
Again, the final determination for which BMPs will be installed, where they will be located and
when they will be installed shall be made by the contractor.
Silt Fencing (Phases I - IV)
Silt fencing shall be provided to prevent migration of sediment off-site into the public right-
of-way and onto neighboring properties. All silt fencing shall be installed prior to any land
disturbing activity (i.e., stockpiling, stripping, grading, excavation, earthwork activities, etc.).
The silt fence inspections should identify tears or holes in the material as well as check for
slumping fence or undercut areas that allow flows to bypass the fencing. The damaged
sections of fencing should be repaired or replaced. Sediment accumulations equal to or
greater than six inches behind the silt fence should be removed to maintain BMP
effectiveness.
At a minimum, it is suggested that silt fencing shall be located along the north and south
property lines of the disturbed area to prevent sediment from leaving the site and entering
the neighboring properties. Additionally, silt fence should be installed along the east
property. This section of silt fence should prevent sediment from entering the public Right-
of-Way (ROW).
Vehicle Tracking Control Pads (Phases I -IV)
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 (e.g., stockpiling, stripping, grading, etc.). The
vehicle tracking control pads should 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.
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Erosion Control Report 6
Vehicle tracking pads should be inspected for degradation. The aggregate material should
remain rough and be replaced if the area becomes clogged with water and/or excess
sediment.
Area Inlet Protection (Phases I - IV)
The TenCate Mirafi Dandy Sack (or approved equal) area Inlet Filter (IF) should be installed
in the existing area inlet located west of the project site in the alley. Inlet Protection (IP)
should be placed around the two proposed Nyloplast 12" Standard Grates. Installing these
BMPs before construction begins should prevent sediment from entering the proposed storm
drain system as well as the existing storm drain system and the Arthur Ditch.
The area inlet protection should be inspected regularly and maintained as necessary. It will
be left to the discretion of the contractor as to when maintenance or replacement is
necessary. The contractor is encouraged to follow the manufacturer recommendations.
Sediment Control Log – aka “Straw Wattles” (Phases I - IV)
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 anchored with a wooden stake.
Sediment Control Logs can be used as perimeter control for stockpiles, as check dams in
small drainage ways (e.g., swales) or on disturbed slopes to shorten flow lengths. If the
wattles are weighted, they can be used as part of an Inlet Protection (IP) design.
Sediment Control Logs should be inspected for excess sediment accumulation. The 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 and for inlet
protection in unpaved areas of the site. Straw wattles are proposed at the downstream end
(or upstream end of the metal sidewalk culverts) of the north and south swales.
Rock Socks (Phases I - IV)
Rock Socks are proposed along the west curbline of Meldrum Street (i.e., at the downstream
end of each metal sidewalk culvert) to reduce the velocity of water leaving the project site
and introduce another opportunity for sediment removal. Rock Sock heights should allow for
pools to develop upstream, creating minor backwaters to both reduce velocities and to allow
sediment deposition. The rock socks should be spaced so that the top of each dam is equal
in elevation to the toe of the next upstream check dam.
Rock socks should be inspected regularly for gaps or holes which would allow water to pass
through the structures untreated. The accumulated sediment should be removed and
typically prior to the sediment depth reaching half the height of the check dam.
At a minimum, rock socks should be installed at downstream end of each metal sidewalk
culvert.
Concrete Washout Area (Phases I - III)
A concrete washout area may be provided on-site. The washout can be lined or unlined
excavated pits in the ground, commercially manufactured prefabricated containers, or above
the ground 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. The 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.
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Erosion Control Report 7
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.
Permanent/Established Vegetation (Phase IV)
Permanent or established vegetation and landscaping is considered a permanent form of
sediment and erosion control. Areas where the previous conditions apply will contain
sufficient permanent BMPs such as sod or landscape material (e.g., smooth river
rock/cobble and wood mulch).
3.3 Non-Structural Practices for Erosion and Sediment Control
Non-Structural BMPs are practices or activities that are implemented to prevent erosion from
occurring or limit its effects. These BMPs can be a practice resulting in physical changes 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.
Good Housekeeping Practices (Phases I -IV)
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, establishing
proper equipment/vehicle fueling and maintenance practices.
Street Sweeping (Phases I -IV)
Street sweeping should be used to remove sediment that has been tracked onto adjacent
roadways. Roadways should be inspected at least once a day, and sediment should be
removed as needed. A check of the area inlet protection should be completed after sweeping
to ensure nothing was displaced during sweeping operations. Street sweeping can reduce
the sediment washed into the existing storm drain system. Street sweeping may be
necessary on the existing hardscape areas which receive runoff from the disturbed areas.
Saw Cutting Pollution Prevention (Phase II)
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
3.4 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
Big Deal Four Plex
Erosion Control Report 8
installation/implementation of BMPs at different stages of the construction process. These phases
are described as follows:
Phase I – Grading Stage; BMPs for initial installation of perimeter controls
Phase II – Infrastructure Stage; BMPs for utility, paving and curb installation
Phase III – Vertical Construction Stage; BMPs for individual building construction.
Phase IV – Permanent BMPs and final site stabilization.
The following is a rough estimate of the anticipated construction sequence for site improvements.
The schedule outlined below is subject to change as the project progresses and as determined by
the contractor.
Table 1 - Construction Schedule
TASK BEGINNING
DATE ENDING DATE
BMP - PHASE OF
DEVELOPMENT
Building Permit TBD TBD I
Removal of Existing Improvements TBD TBD I
Utility Installation TBD TBD II
Building Construction TBD TBD III
Final Stabilization TBD TBD IV
3.5 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. Depending on the severity of the spill, the site construction
superintendent 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.
3.6 Waste Management and Disposal
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-
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Erosion Control Report 9
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 and 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 to prevent dispersion of waste material and potential
pollutants into adjacent properties or waterways.
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Erosion Control Report 10
4.0 Final Stabilization and Long-Term Stormwater Management
4.1 Final Stabilization
The pre-disturbance individual plant density is approximately 75 percent. The existing vegetative
cover is consistent with the age and upkeep of single-family student housing. Final stabilization with
an individual plant density of at least 70 percent of pre-disturbance levels, or equivalent permanent,
physical erosion reduction methods will be achieved. The total disturbed area will be permanently
stabilized with asphalt, concrete, concrete pavers, roof area and landscaping such as sod and
planting beds. It is highly recommended that pre-construction photos be taken to clearly
document vegetative conditions prior any disturbance activities.
4.2 Long-Term Stormwater Management
The primary method of long-term stormwater management will remain unchanged following
completion of the proposed improvements.
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 and 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 to prevent dispersion of waste material and potential
pollutants into adjacent properties or waterways.
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Erosion Control Report 11
5.0 Inspection and Maintenance
4.3 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.
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 herein 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 and vehicle entries to the site.
4.4 BMP Maintenance
Any BMPs not operating in accordance with this Erosion Control Report must be addressed as soon
as possible to prevent the discharge of pollutants.
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.
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Erosion Control Report 12
References
1. Geotechnical Subsurface Exploration Proposed Multi-Family 4-plex Residence 621 South
Meldrum Street Fort Collins, Colorado, November 28, 2012,Soil Logic, Inc. (Soilogic Project
# 12-1094).
2. 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
EROSION CONTROL PLAN | STATIC AND DYNAMIC SITE PLANS
Big Deal Four Plex
Project Number: 876-001 Location: Fort Collins, CO
Date: February 20, 2013 Total Acres: 0.22
EROSION CONTROL MEASURE Units
Estimated
Quantity
Unit
Price
Total
Price
L.F. 410 $1.85 $758.50
each 2 $20.00 $40.00
each 2 $75.00 $150.00
Aea Inlet Protection | Mirafi Dandy Sack each 1 $75.00 $75.00
Curb Inlet Protection (w/o grate) each 0 $75.00 $0.00
Curb Inlet Protection (w/grate) each 0 $100.00 $0.00
Rock Sock each 2 $25.00 $50.00
Vehicle Tracking Control Pad each 1 $700.00 $700.00
L.F. 325 $1.00 $325.00
per hour 0 $70.00 $0.00
acre 0.22 $1,325.00 $291.50
Sub-Total: $2,390.00
1.5 x Sub-Total: $3,585.00
Amount of security: $3,585.00
Total Acres x $1325/acre: $291.50
Sub-Total: $291.50
1.5 x Sub-Total: $437.25
Cost to Re-seed: $330.00
Minimum escrow amount: $3,000.00
Erosion Control Escrow: $3,585.00
NOTE: 'Total Acres' represents total disturbed area.
Area Inlet Protection
Option 3 | Miniumum Escrow Amount
Final Escrow Amount
Big Deal Four Plex
Erosion Control Cost Estimate
Vegetate Landscaped Areas
Option 1 | BMP Costs
Silt Fence
Sawcutting Pollution Prevention
Street Sweeping and Cleaning
Option 2 | Cost to Re-seed Disturbed acreage
Straw Wattles (9" x 10' dimension)
2/20/2013 1:55 PM D:\Projects\876-001\Drainage\Erosion\876-001_Erosion-Escrow-Estimate
APPENDIX B
EROSION CONTROL DETAILS
INSTALLATION GUIDELINES
Remove grate from frame and slip into Dandy
Bag®. Tuck the enclosure flap inside to
completely enclose the grate. Holding the lifting
devices (do not rely on lifting devices to support
the entire weight of the grate), place the grate
into its frame.
DANDY SACK™
The Dandy Sack™ is an open-top bag that is
designed to hang underneath a storm grate to
filter sediment-laden stormwater.
The Difference Dandy Sack™ Makes:
• Easy installation. No rebar required.
• Internal straps cradle grate for added
security when installing & removing.
• 2ft. containment area is very manageable.
• Available in 3 standard sizes.
• Available with optional oil absorbents.
• Available with patented curb blocking
technology, Dandy Curb Sack.™
INSTALLATION GUIDELINES
Remove the grate from catch basin and stand on
end. Move the top lifting straps out of the way
and place the grate into the Dandy Sack™ so that
Dandy Drop Inlet Protection
Flat Grate and Mountable Curb Inlet Protection
OUR COMPANY
TenCate develops and produces materials that
function to increase performance, reduce costs
and deliver measurable results by working with
our customers to provide advanced solutions.
Dandy Products exclusively by TenCate
Geosynthetics have an engineered design in
which suspended solids are allowed to settle
out of the slowed flow and are captured prior
to entering the inlet.
OUR PRODUCTS
DANDY BAG®
The patented Dandy Bag® is designed for use
with flat grates (including round) and mountable
curbs to filter sediment-laden storm water.
The Difference Dandy Bag® Makes:
• Unique patented design keeps silt, sediment
and debris out of storm systems.
• Reduces the need to flush/clean inlets.
• Fabricated from orange geotextile.
• Easy to install, inspect, and re-use.
• Reduces outflow turbidity.
the grate is below the top straps and above the
lower straps. Holding the lifting straps, insert
the grate into the inlet.
DANDY POP™
The Dandy Pop™ is designed for use with flat
field grates to filter sediment-laden water. The
Dandy Pop™ fully encloses the grate, virtually
eliminating sediment infiltration.
The Difference Dandy Pop™ Makes:
• Unique patented design keeps silt,
sediment and debris out of storm systems.
• Easily visible to machine operators in the field.
Property Test Method Units Marv
Grab Tensile Strength (MD x CD)
Grab Tensile Elongation
Puncture Strength
Mullen Burst Strength
Trapezoid Tear Strength (MD x CD)
Percent Open Area (POA)
Apparent Opening Size (AOS)
Permittivity
Permeability
Water Flow Rate
Ultraviolet Resistance
Color
ASTM D 4632
ASTM D 4632
ASTM D 4833
ASTM D 3786
ASTM D 4533
COE -22125-86
ASTM D 4751
ASTM D 4491
ASTM D 4491
ASTM D 4491
ASTM D 4355
1.62 (365) x 0.89 (200)
24 x 10
0.40 (90)
3097 (450)
0.51 (115) x 0.33 (75)
10
0.425 (40)
2.1
0.14
5907 (145)
90
Orange1
kN (lbs)
%
kN (lbs)
kPa (psi)
kN (lbs)
%
mm (US Std Sieve)
sec-1
cm/sec
l/min/m2 (gal/min/ft2)
%
Technical Data for FW® 402 Geotextile
1The orange color geotextile is a trademark of Dandy Products, Inc. US Patent No. 5,725,782, 6,010,622, & 6,749,366
Dandy Drop Inlet Protection
Flat Grate and Mountable Curb Inlet Protection
365 South Holland Drive
Pendergrass, GA 30567
Tel 800 685 9990
Tel 706 693 2226
Fax 706 693 4400
www.mirafi.com
PDS.DROP0508
TenCateTM Geosynthetics North America does not assume liability for the accuracy or completeness of this information or for the ultimate use by the purchaser. TenCateTM Geosynthetics
North America disclaims
Street Sweeping and Cleaning S-11
November 2010 Urban Drainage and Flood Control District SWC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SSC-1. Monthly street sweeping from April through
November removed nearly 40,690 cubic yards of sediment/debris from
Denver streets in 2009. Photo courtesy of Denver Public Works.
Description
Street sweeping uses mechanical pavement
cleaning practices to reduce sediment,
litter and other debris washed into storm
sewers by runoff. This can reduce
pollutant loading to receiving waters and
in some cases reduce clogging of storm
sewers and prolong the life of infiltration
oriented BMPs and reduce clogging of
outlet structures in detention BMPs.
Different designs are available with typical
sweepers categorized as a broom and
conveyor belt sweeper, wet or dry
vacuum-assisted sweepers, and
regenerative-air sweepers. The
effectiveness of street sweeping is
dependent upon particle loadings in the
area being swept, street texture, moisture
conditions, parked car management,
equipment operating conditions and
frequency of cleaning (Pitt et al. 2004).
Appropriate Uses
Street sweeping is an appropriate technique in urban areas where sediment and litter accumulation on
streets is of concern for aesthetic, sanitary, water quality, and air quality reasons. From a pollutant
loading perspective, street cleaning equipment can be most effective in areas where the surface to be
cleaned is the major source of contaminants. These areas include freeways, large commercial parking
lots, and paved storage areas (Pitt et al. 2004). Where significant sediment accumulation occurs on
pervious surfaces tributary to infiltration BMPs, street sweeping may help to reduce clogging of
infiltration media. In areas where construction activity is occurring, street sweeping should occur as part
of construction site stormwater management plans. Vacuuming of permeable pavement systems is also
considered a basic routine maintenance practice to maintain the BMP in effective operating condition.
See the maintenance chapter for more information on permeable pavement systems. Not all sweepers are
appropriate for this application.
Practice Guidelines1
1. Post street sweeping schedules with signs and on local government websites so that cars are not
parked on the street during designated sweeping days.
2. Sweeping frequency is dependent on local government budget, staffing, and equipment availability,
but monthly sweeping during non-winter months is a common approach in the metro Denver urban
1 Practice guidelines adapted from CASQA (2003) California Stormwater BMP Handbook, Practice SC-70 Road and Street
Maintenance.
S-11 Street Sweeping and Cleaning
SWC-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Changes in Street Sweeper Technology (Source: Center for Watershed Protection 2002)
At one time, street sweepers were thought to have great potential to remove stormwater pollutants from
urban street surfaces and were widely touted as a stormwater treatment practice in many communities.
Street sweeping gradually fell out of favor, largely as a result of performance monitoring conducted as
part of the National Urban Runoff Program (NURP). These studies generally concluded that street
sweepers were not very effective in reducing pollutant loads (USEPA, 1983). The primary reason for
the mediocre performance was that mechanical sweepers of that era were unable to pick up fine-grained
sediment particles that carry a substantial portion of the stormwater pollutant load. In addition, the
performance of sweepers is constrained by that portion of a street’s stormwater pollutant load delivered
from outside street pavements (e.g., pollutants that wash onto the street from adjacent areas or are
directly deposited on the street by rainfall). Street sweeping technology, however, has evolved
considerably since the days of the NURP testing. Today, communities have a choice in three basic
sweeping technologies to clean their urban streets: traditional mechanical sweepers that utilize a broom
and conveyor belt, vacuum-assisted sweepers, and regenerative-air sweepers (those that blast air onto
the pavement to loosen sediment particles and vacuum them into a hopper).
For more information, see
http://www.cwp.org/Resource_Library/Center_Docs/PWP/ELC_PWP121.pdf
area. Consider increasing sweeping frequency based on factors such as traffic volume, land use, field
observations of sediment and trash accumulation, proximity to watercourses, etc. For example:
Increase the sweeping frequency for streets with high pollutant loadings, especially in high traffic
and industrial areas.
Conduct street sweeping prior to wetter seasons to remove accumulated sediments.
Increase the sweeping frequency for streets in special problem areas such as special events, high
litter or erosion zones.
3. Perform street cleaning during dry weather if possible.
4. Avoid wet cleaning the street; instead, utilize dry methods where possible.
5. Maintain cleaning equipment in good working condition and purchase replacement equipment as
needed. Old sweepers should be replaced with more technologically advanced sweepers (preferably
regenerative air sweepers) that maximize pollutant removal.
6. Operate sweepers at manufacturer recommended optimal speed levels to increase effectiveness.
7. Regularly inspect vehicles and equipment for leaks and repair promptly.
8. Keep accurate logs of the number of curb-miles swept and the amount of waste collected.
9. Dispose of street sweeping debris and dirt at a landfill.
10. Do not store swept material along the side of the street or near a storm drain inlet.
Clearing & Grading Development Standards Page 123
Source: http://www.ci.bellevue.wa.us/pdf/Development%20Services/CG_DevStds2010_BMPC152.pdf
BMP C152: Sawcutting and Surfacing Pollution Prevention SPP
Purpose Sawcutting and surfacing operations generate slurry and process water
that contains fine particles and high pH (concrete cutting), both of which
can violate the water quality standards in the receiving water. This BMP
is intended to minimize and eliminate process water and slurry from
entering waters of the State.
Conditions of Use Anytime sawcutting or surfacing operations take place, these
management practices shall be utilized. Sawcutting and surfacing
operations include, but are not limited to, the following:
Sawing
Coring
Grinding
Roughening
Hydro-demolition
Bridge and road surfacing
Design and
Installation
Specifications
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 quality standards.
Process water that is generated during hydro-demolition, surface
roughening or similar operations shall not drain to any natural or
constructed drainage conveyance and shall be disposed of in a manner
that does not violate groundwater or surface water quality standards.
Cleaning waste material and demolition debris shall be handled and
disposed of in a manner that does not cause contamination of water. If
the area is swept with a pick-up sweeper, the material must be hauled
out of the area to an appropriate disposal site.
Maintenance
Standards
Continually monitor operations to determine whether slurry, cuttings, or
process water could enter waters of the state. If inspections show that a
violation of water quality standards could occur, stop operations and
immediately implement preventive measures such as berms, barriers,
secondary containment, and vacuum trucks.
APPENDIX C
LANDSCAPE PLAN
any and all express, implied, statutory standards, warranties, guarantees, including without limitation any implied warranty as to merchantability or fitness for a particular purpose
or arising from a course of
dealing or usage of trade as to any equipment, materials, or information furnished herewith. This document should not be construed as engineering advice.
Mirafi® is a registered trademark of TenCateTM Geosynthetics North America.
ISO 9001
FM 61026
• Pops open in a second.
• Dome design provides easy cleaning
and maintenance.
• Standard sizes to fit any grate.
INSTALLATION GUIDELINES
Pop open the Dandy Pop™ near the inlet.
Remove grate from frame and place into
Dandy Pop™. Pull up slack and seal hook and
loop fastener to enclose the grate. Holding
the lifting straps, insert the grate into the
inlet making sure that the grate seats
completely in the frame.
Dandy Bag® Dandy Sack™ Dandy Pop™
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