HomeMy WebLinkAboutDrainage Reports - 04/03/20180-
EROSION CONTROL REPORT
FOR
ELIZABETH SUBDIVISION
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CITY OF FORT COLLINS
JANUARY 2018
COLORADO CIVIL GROUP, INC.
Mr
IFIrd-
00i0RA00 CIVIC GROUPS INC:
January 31, 2018
Ms. Heather McDowell, PE
Water Utilities Engineering
City of Fort Collins
281 N College Avenue
Fort Collins, CO 80524
Re: Elizabeth Subdivision
Project No. 0036.0002.00
Dear Ms. McDowell,
We are pleased to submit this Erosion Control Report for the Elizabeth Subdivision. This report was prepared
based on current City of Fort Collins and Urban Drainage Flood Control District storm drainage criteria.
Please let me know if you have any questions or comments.
Sincerely,
COLORADO CIVIL GROUP, INC.
Jamie K. Galyon, PE
Colorado Civil Group, Inc.
Elizabeth Subdivision
Erosion Control Report January 2018
Table of Contents
1 Introduction..............................................................................................................................................................1
1.1 Report Objectives (I.B.1— I.B.4)........................................................................................................................1
1.2 ECP Administrator(I.C.3.a)............................................................................................................................... 1
2 Site Description(I.C.1).............................................................................................................................................. 2
2.1 Site Location..................................................................................................................................................... 2
2.2 Existing Site Description................................................................................................................................... 3
2.2.1 Existing Physical Characteristics(I.C.1.c)...............................................................................:.............
3
2.2.2 Existing Soil Properties (I.C.l.d)..........................................................................................................
3
2.2.3 Existing Vegetation(I.C.1.e)................................................................................................................4
2.2.4 Flood Insurance Rate Map (FIRM).......................................................................................................4
2.2.5 Existing Receiving Waters(I.C.1.h)...:..................................................................................................4
2.3
Proposed Site Description................................................................................................................................
4
2.3.1 Proposed Construction Activity (I.C.l.a and I.C.1.b)...........................................................................4
2.3.2 Proposed Physical Characteristics (I.C.l.a).........................................................................................
5
2.3.3 Potential Non-Stormwater Discharges(I.C.1.g)..................................................................................5
2.3.4 Proposed Controls...............................................................................................................................
5
3 Identification of Pollutant Sources...........................................................................................................................
5
3.1
Disturbed or Stored Soils (I.C.3.b.1).................................................................................................................
6
3.2
Vehicle Tracking of Sediments(I.C.3.b.2).........................................................................................................
6
3.3
Management of Contaminated Soils (I.C.3.b.3)...............................................................................................
6
3.4
Loading and Unloading Operations (I.C.3.b.4).................................................................................................6
3.5
Outdoor Storage Activities(I.C.3.b.5)...............................................................................................................
6
3.6
Vehicle and Equipment Maintenance and Fueling(I.C.3.b.6)..........................................................................7
3.7
Significant Dust or Particulate Generating Processes(I.C.3.b.7)......................................................................
7
3.8
Routine Maintenance Activities(I.C.3.b.8).......................................................................................................
7
3.9
On -Site Waste Management Practices(I.C.3.b.9)............................................................................................7
3.10
Concrete Truck Washout (I.C.3.b.10)...............................................................................................................
7
3.11
Non -Industrial Waste Sources (I.C.3.b.12).......................................................................................................
8
3.12
Other Areas or Procedures where Potential Spills Can Occur(I.C.3.b.13).......................................................8
4 Stormwater Management Controls (I.C.3.c)............................................................................................................
8
4.1
Four -Step Process.............................................................................................................................................8
4.1.1 Step 1: Runoff Reduction....................................................................................................................8
4.1.2 Step 2: Treat and Slowly Release Runoff............................................................................................
9
4.1.3 Step 3: Stabilize Drainageways...........................................................................................................
9
Colorado Civil Group,
Inc.
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Elizabeth Subdivision
Erosion Control Report
January 2018
4.1.4 Step 4: Implementation of Source Controls.......................................................................................9
4.2 Temporary BMPs..............................................................................................................................................9
4.2.1 Vehicle Tracking Control Pad with Wheel Washout(I.C.3.c.6)...........................................................9
4.2.2 Stabilized Staging Area(Structural - I.C.3.c.1)...................................................................................10
4.2.3 Silt Fence (Structural - I.C.3.c.1)........................................................................................................10
4.2.4 Rock Socks (Structural - I.C.3.c.1)......................................................................................................10
4.2.5 Curb Inlet Protection (Structural - I.C.3.c.1)......................................................................................11
4.2.6 Surface Roughening and Slope Protection (Non -Structural - I.C.3.c.2)........................:...................11
4.3 Permanent BMPs............................................................................................................................................12
4.3.1 Erosion Control Fabric (Structural - I.C.3.c.1)....................................................................................12
4.3.2 Surface Roughening/Mulching and Re -Seeding (Non -Structural - I.C.3.c.2)....................................12
4.3.3 Dry Well Detention Area (Structural - I.C.3.c.1)................................................................................12
5 BMPs for Material Handling and Spill Prevention(I.C.3.c.4)..................................................................................13
6 Final Stabilization and Ultimate Stormwater Management (I.C.4)........................................................................14
7 Construction Site Inspection and Maintenance (I.C.5, I.D.6, I.D.7)........................................................................14
Figures and Tables
Figure1-1: Vicinity Map................................................................................................................................................ 2
Table 2-1: Anticipated Construction Phases................................................................................................................. 5
Table4-1: LID Treatment............................................................................................................................................ 13
Appendices
Appendix A: General Permit Application................................................................................:.....................................A
Appendix B: Existing Soil Information.......................................................................................................................... B
Appendix C: Erosion Control Plan and Details.............................................................................................................. C
Colorado Civil Group, Inc. Ii
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Elizabeth Subdivision
Erosion Control Report
January 2018
1 Introduction
1.1 Report Objectives (I.B.1-1.B.4)
The objective of this report is to create an Erosion Control Plan (ECP) to
"identify possible pollutant sources to stormwater and to set out Best Management
Practices (BMPs) that, when implemented, will reduce or eliminate any possible water
quality impacts." (from Colorado's Stormwater Program Fact Sheet)
More specifically, this report covers each facility in the General Permit Application for
Stormwater Discharges Associated with Construction Activity (Stormwater Construction
Permit). A copy of the Stormwater Construction Permit will be included in Appendix A
after issuance. This report identifies all potential pollutant sources which could adversely
affect the quality of the discharged stormwater and suggests measures that can be
implemented to reduce stormwater pollutants associated with construction activity. All
measures described within this report are in accordance with good engineering practices,
which include installation, implementation, and maintenance requirements, and must be
updated in accordance with Part I.D.5.c of the Stormwater Construction Permit, to ensure
compliance with the terms and conditions of the permit. Furthermore, any potential
pollutant that can reasonably be expected during construction activity through final
stabilization must be identified and any possible water quality impacts must be reduced
or eliminated by implementing the suggested measures found within this report.
1.2 ECP Administrator (I.C.1a)
The ECP Administrator is responsible for developing, implementing, maintaining, and
revising the ECP. The ECP Administrator will be assigned by the General Contractor
and should be noted below when the construction contract is awarded:
Name:
Title:
Company:
Address:
Phone:
Email:
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Elizabeth Subdivision
Erosion Control Report
2 Site Description (I.C.1)
2.1 Site Location
January 2018
The Elizabeth Subdivision site is located in the Southeast Quarter of Section 13, Township
7 North, Range 69 West of the 61h Principal Meridian, City of Fort Collins, County of
Larimer, Colorado. The site is bounded on the north by East Elizabeth Street and on
the west, south, and east by neighboring single-family residential lots. A vicinity map is
presented in Figure 1-1. The project area is generally located at Latitude 40' 34' 27"
and Longitude -105' 3' 47".
Figure 1-1: Vicinity Map
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Elizabeth Subdivision
Erosion Control Report
2.2 Existing Site Description
2.2.1 Existing Physical Characteristics (I.C.l.c)
January 2018
The Elizabeth Subdivision project includes the replatting of two parcels (parcels
9713400012 and 9713400006). The northwest lot will be increased from 5,000
square feet to 7,840 square feet. A new single-family home will be built on the
southeast lot. The construction of the single-family home will include a driveway
from Elizabeth Street and off-street parking. The parking lot for the commercial
building will be modified to meet City of Fort Collins setback requirements and to
accommodate the driveway for the single-family home.
2.2.2 Existing Soil Properties (I.C.l.d)
Soil properties described in this section were determined from the Natural
Resources Conservation Service (NRCS) website using the Web Soil Survey to
compile and present the data. The soils found on -site can be classified as 53%
(94) Satanta loam with 0 to 1 percent slopes and 47% (95) Satanta loam, 1 to
3 percent slopes. The soil falls into the wind erodibility group of 5 and has a
wind erodibility index of 56. Wind erodibility groups range from 1 to 8 where
group 1 is the most susceptible to wind erosion and group 8 is the least
susceptible. The wind erodibility index is a numerical value, ranging from 0 to
310, indicating the susceptibility of soil to wind erosion, or the tons per acre per
year that can be expected to be lost to wind erosion. A wind erosion index of
56 indicates that the soil is mildly susceptible to being lost to wind erosion. The
existing site consists of a commercial building with paved parking lot and natural
or landscaped open space. As construction on site progresses, the erosion
potential due to wind in disturbed areas is considered moderate with moderate
potential for soil transportation.
The soils found on -site fall into Hydrologic Soil Group B. Group B soils have a
moderate infiltration rate and consist of moderately well drained or well drained
soils. The soils have a moderate rate of water transmission. This means that
water will infiltrate into the soil during rain and snow storm events.
Several exhibits are provided in Appendix B that show the soil properties presented
in this section. i
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2.2.3 Existing Vegetation (I.C.i.e)
January 2018
The northern portion of the site that is not developed is landscaped with grass,
shrubs, and trees. The southern portion of the site is mainly anon-irrigated grass
area with some trees along the outer boundary. The current imperviousness is
approximately 29%. The remaining 71 % consists of vegetated area with
approximately 50% vegetation density, as described above.
2.2.4 Flood Insurance Rate Map (FIRM)
The project site is located within Zone `X' of Community -Panel Number
08069C1189F, revised December 19, 2006. Zone `X' is defined as "Areas
determined to be outside the 0.2% annual chance floodplain." A portion of the
referenced map can be found in Appendix B of this report. "
2.2.5 Existing Receiving Waters (I.C.11)
The project site is part of the Spring Creek Drainage Basin. The Spring Creek
Drainage Basin generally conveys runoff to the Poudre River. Runoff from the
commercial portion of the Elizabeth Subdivision project site is conveyed via sheet
flow to Elizabeth Street. Street flow continues to the nearest downstream inlet,
which is located on Garfield Street approximately 325 feet east of Morgan Street,
where it enters the storm sewer system. In the storm sewer system, storm runoff
flows approximately 800 feet east to Lemay Avenue, then approximately 2,600
feet south to Spring Creek, and then approximately 8,000 feet east to reach the
river. The majority of existing runoff from the residential lot is conveyed via sheet
flow to the neighboring properties on the south and east sides of the property.
2.3 Proposed Site Description
2.3.1 Proposed Construction Activity (I.C.i.a and I.C.1.1b)
The proposed construction activity will begin with the installation of erosion control
devices in Elizabeth Street and along the project boundary. Silt fence will be
installed along the perimeters of the disturbed areas. After the erosion control
devices are installed, construction will begin, including utility installation, grading,
construction of the new buildings, demolition of a portion of the parking, and
asphalt laying for the new driveway. Disturbed areas that are not paved will be
landscaped. After these steps are complete the site will reach final stabilization.
Table 2-1 shows the anticipated construction activities within each phase of site
construction.
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Elizabeth Subdivision
Erosion Control Report
Table 2-1: Anticipated Construction Phases
January 2018
Construction Activity
Erosion Control Installation
Site Development
Phase I
Utility Installation and Grading
Phase It
Building Construction
Phase III
Concrete Curb & Gutter and Asphalt Pavement
Phase IV
Final Stabilization
Phase V
2.3.2 Proposed Physical Characteristics (I.C.l.a)
The proposed physical characteristics of the site will be modified with the the
construction of the single family residence, demolition of a portion of the existing
parking lot, and paving of the residential driveway. The proposed drainage
patterns will generally follow the existing drainage patterns. There are no
proposed changes in soil type, hydrologic soil group, or drainage class. However,
the imperviousness of the site will be increased to 46% as a result of the
construction.
2.3.3 Potential Non-Stormwater Discharges (I.C.l.g)
There are several potential non-stormwater discharges associated with construction
activities anticipated for the Elizabeth Subdivision project. The potential discharges
are from the use of a concrete washout, trench dewatering, watering for dust
control and compaction. The concrete waste will be contained within the concrete
washout area or transported off -site and disposed of. No change to regulated
floodplains/floodways are anticipated within the project area.
2.3.4 Proposed Controls
Controls are necessary once construction begins and must continue until the
project is complete, leaving no exposed soils. These controls are critical to
ensuring that downstream receiving waters are protected from contamination due
to soil erosion caused by wind and surface runoff, as well as any potential
chemical or biological contamination anticipated due to construction activities.
Controls used for site development are discussed in greater detail in Section 4.
3 Identification of Pollutant Sources
This section of the ECP report attempts to identify all pollutant sources expected with the
construction of the proposed site. Since it is not possible to know all of the construction
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January 2018
activities that will occur on -site during the creation of this report, it is critical that the Contractor
be aware of all construction activities and their potential to contaminate stormwater either
above or below ground, and if needed, install controls to prevent contamination. The following
sections describe pollutant sources in detail.
3.1 Disturbed or Stored Soils (I.C.3.b.1)
Approximately 53 percent of the site (0.41 acres) will be disturbed with the construction
activities. Once soils have been disturbed, they do not retain the same compaction as
in their native state, therefore surface runoff can cause more soil erosion than was
historically observed. Stockpiles shall be placed in an area where the proposed BMPs
(i.e. wattles or silt fence) will prevent the migration of soils into the public streets and
stormwater system.
3.2 Vehicle Tracking of Sediments (I.C.3.b.2)
Vehicle tracking of sediments will occur throughout the construction process. The
implementation of street sweeping practices and keeping vehicles on paved surfaces is
critical in reducing pollutants during construction. Vehicle tracking control pads will be
used to reduce the tracking of sediments.
3.3 Management of Contaminated Soils (I.C.3.b.3)
No contaminated soils are expected on -site. In the event that soils are found to be
contaminated on -site, the ECP Administrator should be notified. Proper procedures to
collect and dispose of contaminated soils should be followed based on the type and
extent of soil contamination.
3.4 Loading and Unloading Operations (I.C.3.b.4)
Loading and unloading operations will occur on the project site where BMPs (i.e. staging
area, vehicle tracking control pads, and concrete washout) will have been installed. These
operations should not introduce contaminants to the stormwater system. Spill kits should
be provided at the project site in case of an accidental spill. No additional controls for
these loading operations are anticipated.
3.5 Outdoor Storage Activities (I.C.3.b.5)
Construction materials may be stored on -site with the construction of the Elizabeth
Subdivision project. However, these materials should not produce any contaminants that
could be transported during precipitation events. Materials that could produce contaminate
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January 2018
transportation should be covered with an impermeable tarp to prevent discharging from
the site during precipitation events.
3.6 Vehicle and Equipment Maintenance and Fueling (I.C.3.b.6)
Due to the planned construction activities, it is anticipated that equipment maintenance
and fueling will occur on -site. These procedures must only be allowed to occur in one
designated area on -site to limit spillage of maintenance liquids/lubricants and fuel. An
impermeable tarp that prevents fuel and other liquids from infiltrating the soil must cover
the fueling area. Proper disposal 'of contaminated soil must occur after the construction
is complete or at frequent intervals, if necessary. Spill kits should be provided at the
project site in case of an accidental spill.
3.7 Significant Dust or Particulate Generating Processes (I.C.3.b.7)
Dust or particulate generation is typical in the northern front range of Colorado, and can
happen anytime during the year. The contractor shall refer to the "Dust Prevention and
Control Manual' from the City of Fort Collins to ensure that proper fugitive dust prevention
takes place on -site.
3.8 Routine Maintenance Activities (I.C.3.b.8)
Other than typical vehicle repair and maintenance, there are no other anticipated
maintenance activities that require additional controls.
3.9 On -Site Waste Management Practices (I.C.3.b.9)
Nearly all construction sites must implement some sort of waste management practice
and the Elizabeth Subdivision project is no exception. Portable toilets, dumpsters, and
construction debris must be located in areas where, if spillage occurred, it would not
enter the public streets or stormwater system. Portable toilets must be staked down.
3.10 Concrete Truck Washout (I.C.3.b.10)
Concrete construction is planned for this project, so a designated area for a concrete
truck washout is ineeded. Part I.D.3.c of the Stormwater Construction Permit must be
followed in order ,to allow the, conditional discharge of concrete washout material to the
designated area. Other equipment washing may occur throughout the construction
process as well, so this equipment should be washed in the same area as the concrete
truck washout. The concrete washout area shall be constructed per the Urban Drainage
Flood Control District (UDFCD) standard details.
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Erosion Control Report January 2018
3.11 Non -Industrial Waste Sources (I.C.3.b.12)
One location must be setup for disposing of liquid and solid wastes generated during the
construction process. Containers must be kept closed at all times to prevent waste from
blowing off -site during days with high winds. Construction debris can be stored until
removed from the site and disposed of properly.
3.12 Other Areas or Procedures where Potential Spills Can Occur (I.C.3.b.13)
There are no other areas or procedures to our knowledge where potential spills can
occur with the construction of the Elizabeth Subdivision project.
4 Stormwater Management Controls (I.C.3.c)
Stormwater management controls are commonly referred to as Best Management Practices, or
BMPs. The typical duration of use for individual BMP's can vary depending on the type of
BMP, the function of the BMP, the type of construction, and the duration of construction
activities. All projects require both temporary and permanent BMPs to be installed during and
following construction activities. The following sections will identify both temporary and
permanent BMPs that are to be used with proposed project. The implementation phase is
provided for each BMP in addition to the inspection interval. Anticipated BMPs to be used
with the Elizabeth Subdivision project have been identified on the Erosion Control Plan, which
is provided in Appendix C. During the design phase, it can be difficult to identify all necessary
preventative measures needed to prevent receiving water contamination; therefore, the
Contractor must monitor the ongoing construction and install any BMP, whether listed in the
report or not, necessary to prevent contamination. The ECP Administrator should modify the
Erosion Control Plan as necessary to document BMP installation and maintenance during the
life of the project.
4.1 Four -Step Process
The selection of BMPs is part of the "Four -Step Process for Stormwater Quality
Management" as outlined by UDFCD and adopted by the City of Fort Collins. The
following sections explain that four -step process.
4.1.1 Step 1: Runoff Reduction
The first step in stormwater quality management is to reduce runoff peaks,
volumes, and, pollutant loads from urbanizing areas by implementing Low Impact
Development (LID) strategies. LID practices include reducing unnecessary
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January 2018
impervious areas and routing runoff from impervious surfaces over permeable
areas to slow runoff and promote infiltration.
4.1.2 Step 2: Treat and Slowly Release Runoff
After reducing the runoff from a site, the second step in stormwater quality
management is to capture and slowly release a Water Quality Capture Volume
(WQCV). WQCV facilities may include bioretention, extended detention basins,
sand filters, constructed wetland ponds, and retention ponds.
4.1.3 Step 3: Stabilize Drainageways
Although steps 1 and 2 help to minimize the effects of runoff on downstream
drainageways, natural drainageways are often subject to bed and bank erosion
due to increases in the frequency, rate, duration, and volume of runoff. Step 3
includes measures to prevent drainageway erosion.
There are no drainageways on the Elizabeth Subdivision site. By implementing
steps 1 and 2, the project site does its part to reduce drainageway erosion
downstream.
4.1.4 Step 4: Implementation of Source Controls
The final step in stormwater quality management is source control. Site specific
needs such as material storage or other site operations require consideration of
targeted source control Best Management Practices (BMPs). These BMPs are
shown on the Erosion Control Plan and explained in the following sections.
4.2 Temporary BMPs
The following description of temporary BMPs is organized to provide some indication as
to the order in which the BMPs are to be installed. This order is based on typical
construction activity sequencing. Temporary BMP details can be found in Appendix C of
this report.
4.2.1 Vehicle Tracking Control Pad with Wheel Washout (I.C.3.c.6)
Vehicle tracking control pads should be the first BMP installed in the construction
process, when necessary. Tracking control pads can also be supplemented with
a wheel washout, which is a designated area within the tracking control pad to
spray off large material prior to leaving the site. Vehicle tracking control pads
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January 2018
will be installed where indicated on the Grading and Erosion Control Plan and
should be installed per the details provided in Appendix C.
Implementation Phase (I. C. 3. c. 3) - Phase /
Inspection Interval (I. D. 6 and I. D. 7) - Semi -Monthly
4.2.2 Stabilized Staging Area (Structural - I.C.3.c.1)
A stabilized staging area should be established to ensure there is a large enough
area to fully contain parking, storage, and unloading and loading operations.
These areas can be comprised of a minimum of 3 inch granular -material and
constructed as shown on the detail. The Contractor can utilize a portion of the
commercial building parking lot, which can function as .Stabilized Staging Areas
since it is paved.
Implementation Phase (I. C 3. c.3) - Phase /
Inspection Interval (I. D. 6 and I. D. 7) - Semi -Monthly
4.2.3 Silt Fence (Structural - I.C.3.c.1)
Silt Fence should be one of the first BMPs installed prior to construction and
must be installed before any soil disturbance occurs. Silt Fence should be
installed per the construction plan details and must continually be monitored for
effectiveness. Silt Fence does not need to be installed around the entire
construction site; it only needs to be installed where surface runoff might transport
sediment or other materials off -site. Silt Fence will be installed where Indicated
on the Grading and Erosion Control Plan. Additional silt fence should Installed
if determined necessary by the ECP Administrator.
Implementation Phase (I. C 3. c.3) - Phase /
Inspection Interval (l. D. 6 and 1. D. 7) - Semi -Monthly and within 24 hours fo/%w/ng
prec/pitation or snow melt
4.2.4 Rock Socks (Structural - I.C.3.c.1)
Rock Socks will be used along Elizabeth Street during the construction process
to mitigate the transportation of sediment. Proper installation is the most important
aspect of rock socks. These protection, measures function poorly if not installed
correctly, so the construction details provided with the plans must be followed.
Waddle Dikes will be installed where indicated on the Grading and Erosion
Control Plan.
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Implementation Phase (1.0.3.c.3) - Phase /
Inspection Interval (l. D. 6 and 1. D. 7) - Semi -Monthly and within 24 hours following
precipitation or snow melt
4.2.5 Curb Inlet Protection (Structural - I.C.3.c.1)
Existing curb inlets collect generated surface runoff and protection from sediment
transportation must be provided at each inlet. There are many different types of
curb inlet protection, but this report recommends gravel filters, which filter out
sediment and allow runoff to pass into the storm sewer system. The curb Inlet
protection Installation details can be found In Appendix C. The curb Inlet
protection Is needed at the nearest downstream Inlet, which is located on
Garfield Street approximately 325 feet east of Morgan Street.
Implementation Phase (I. C 3. c.3) - Phase /
Inspection Interval (I. D. 6 and I. D. 7) - Semi -Monthly and within 24 hours following
precipitation or snow melt
4.2.6 Surface Roughening and Slope Protection (Non -Structural - I.C.3.c.2)
As grading alters the historic landscape, techniques must be utilized to reduce
the possibility of soil erosion. Surface roughening and slope protection techniques
help minimize soil erosion during construction and prior to mulching and re -
vegetation. The most commonly used technique is to drive over a sloped area
with a "tracked" vehicle so impressions run perpendicular to the slope (and
surface runoff). The roughened surface creates a series of small check dams
helping to slow surface runoff velocities and increase the flow length, both of
which help to minimize sediment transportation. Other possible techniques of
slope protection include installing silt fence.at the top of a sloped area to prevent
large amounts of surface runoff from sheet flowing to the slope, grading in a
swale to catch sheet flow draining to the slope and re -directing the runoff to a
desired location, and installing straw wattle barriers perpendicular to runoff flow
paths. Due to the mild slopes present on sight, no temporary slope protection
is anticipated for this project.
Implementation Phase (I. C. 3. c. 3) - N/A
Inspection Interval (/. D. 6 and I. D. 7) - N/A
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4.3 Permanent BMPs
4.3.1 Erosion Control Fabric (Structural - I.C.3.c.1)
January 2018
Where slopes are steeper than 4:1, Erosion Control Fabric is necessary to protect
the slope from erosion. Erosion Control Fabric is designed to control erosion and
enhance vegetation establishment and survivability, especially on slopes and in
channels. Erosion Control Fabric will be installed where indicated on the
Grading and Erosion Control Plan.
Implementation Phase (l. C. 3. c. 3) - Phase V
Inspection Interval (1.D.6 and 1.D.7) - Semi Monthly and within 24 hours following
precipitation or snow melt
4.3.2 Surface Roughening/Mulching and Re -Seeding (Non -Structural - I.C.3.c.2)
Once a construction site is reaching completion, areas of bare ground that have
not already been protected with surface roughening techniques, landscaping,
mulching, or re -seeding must receive this permanent treatment. This permanent
BMP is critical to preventing soil erosion during precipitation events and achieving
final stabilization. Surface roughening is expected once the final grades are
established.
Implementation Phase (I. C.3. c.3) - Phase V
Inspection Interval (l. D. 6 and /. D. 7) - Semi Monthly and within 24 hours following
precipitation or snow melt
4.3.3 Dry Well Detention Area (Structural - I.C.3.c.1)
Dry well detention utilizes bioretention to reduce the transportation of pollutants
to downstream receiving waters through sedimentation, filtering, adsorption,
evapotranspiration, and biological uptake of constituents. In addition, a dry well
is provided to aid in the infiltration of storm water runoff. The UDFCD equations
for the calculation of Water Quality Capture Volume (WQCV) have been used for
the Elizabeth Subdivision project.
The City of Fort Collins LID ordinance requires that for 75% of all newly added
or modified impervious areas be treated by LID techniques. Based on
conversations with the City of Fort Collins Engineering Department, no LID systems
are required for the single family residence lot because the ongoing maintenance
and inspections by erosion control inspectors can be difficult on a private lot. For
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January 2018
that reason, only the new or modified impervious area on the commercial lot has
been considered for the requirement of 75% treatment by LID, although a portion
of the residential lot, including all the impervious area, is also treated by the dry
well detention area. A small portion of the new or modified impervious area on
the commercial lot flows directly to Elizabeth Street and is therefore not treated
by the dry well detention area. Table 3-1 shows how the LID requirements have
been met for this project.
Implementation Phase (I. C.3. c.3) - Phase ll
Inspection Interval (l. D. 6 and I. D. 7) - Semi -Monthly and within 24 hours following
precipitation or snow melt
Table 4-1: LID Treatment
• • FOR COMMERCIAL•
PROJECT AREA
TOTAL COMMERCIAL AREA (INCLUDING ROW) 10,162
SF
NEW COMMERCIAL IMPERVIOUS AREA 1,689
SF
REQUIRED MINIMUM AREA TO BE TREATED BY LID 1,266
(75% OF NEW COMMERCIAL IMPERVIOUS AREA)
SF
NEW IMPERVIOUS AREA TREATED BY LID 1,504
SF
PERCENT OF NEW IMPERVIOUS AREA TREATED BY LID 89
%
5 BMPs for Material Handling and Spill Prevention (I.C.3.c.4)
Section 3 of this report identifies possible pollutant sources that can be expected with the
construction of the Elizabeth Subdivision project. Material handling and spill prevention
information must be distributed to all contractors and subcontractors working at the construction
site. This information, along with response and notification procedures, must be in place prior
to construction and must be administered by the site superintendent.
Contractors should be instructed to notify the site superintendent and ECP Administrator
immediately if any spill occurs. The ECP Administrator will determine the nature of the spill
and, if necessary, contact the Colorado Department of Public Health and Environment (24-hour
spill reporting line - 877-518-5608), downstream water users, and any other agency or
jurisdiction deemed necessary.
Colorado Civil Group, Inc. 1 13
MW
Elizabeth Subdivision
January 2018
Erosion Control Report
For hazardous material or liquid storage, concrete truck washouts, and fueling and maintenance
locations, proper instructions for clean-up procedures should be posted and spill kit locations
should be identified. Information, -on absorbents should also be made available at all liquid
storage locations and fueling locations, and proper disposal ,locations for used absorbents
should be provided.
6 Final Stabilization and Ultimate Stormwater Management (I.C.4)
Final stabilization is the last step in the construction process and begins after major construction
activities have ended. The site superintendent should inspect the site one final time to ensure
that all temporary and permanent BMPs will function correctly in aprecipitation event. If any
unpaved areas exist, all exposed or bare soil that has not previously been treated must be
identified and the appropriate procedure implemented to achieve final stabilization per the
landscape plan. This can include re -seeding of the area with an approved seed mix, soil
preparation, soil amendments, where necessary, and soil stabilization methods such as crimped
straw, hydro -mulch, or rolled erosion control products. Stabilization and reseeding should be
in accordance with City of Fort Collins City Code 12-130 and 12-132. All areas that are re-
seeded with drought tolerant grasses should use a temporary irrigation system to promote the
quick growth until the grasses have been established. Final stabilization is achieved once all
ground disturbing activities have been completed . and uniform vegetative cover has been
established with an individual plant density of at least 70% of pre -disturbance levels. Ultimate
stormwater management is achieved through the use of temporary BMPs until final site
stabilization is achieved and the continued maintenance and operation of the permanent BMPs
installed on -site.
7 Construction Site Inspection and Maintenance (I.C.5, I.D.6, I.D.7)
Standard construction site inspection and maintenance schedules were identified in Section 4
for each of the anticipated temporary and permanent BMPs to be installed on -site. Part I.D.6.a
of the Stormwater Construction Permit requires that a thorough' inspection of the stormwater
management system be performed and documented at least every 14 days and within 24
hours following any precipitation or snowmelt event that causes surface erosion. More frequent
inspections may be necessary and should be performed .at the request of the ECP
Administrator. This report can be modified to provide any additional pollution controls or meet
increased inspection needs if deemed necessary. Standard site inspection procedures that
must be followed by the site superintendent are as follows: 1 .
Colorado Civil Group, Inc. 14
MW
Elizabeth Subdivision
Erosion Control Report
January 2018
• The perimeter of the construction site must be inspected to ensure that no unintended
stormwater discharge is occurring.
• All perimeter temporary and permanent BMPs must be inspected to ensure they are
functioning correctly and are in a condition that can reasonably be expected to function
appropriately in a future precipitation event.
• Any disturbed areas should be inspected to determine if pollution is entering the
stormwater system and if any further controls should be implemented to better protect
the stormwater system.
• All areas where construction site material is stored should be inspected for compliance
with this report. Areas should be checked for any spills that may have occurred
without being reported and should also be evaluated to determine if additional control
measures should be installed to prevent contamination. If necessary, these areas
should be checked to ensure that they are covered or protected from precipitation or
wind events.
• All interior temporary and permanent BMPs should be inspected for performance and
should be replaced if found to be deficient.
• The site superintendent should monitor the construction activities occurring on -site and
install approved controls as necessary even if those controls are not mentioned in this
report.
• A log of each inspection should be kept on -site at all times and should be made
available upon request to any governing agency or jurisdiction, the Environmental
Protection Agency, or the Colorado Department of Public Health and Environment.
A log book may be kept for use in tracking other items related to the ECP such as those
listed below. Additional information such as dated photographs, field notebooks, drawings and
maps, and the items below, etc. can also be included where appropriate.
• BMP operation and maintenance ,
• Stormwater contamination
• Contacts with suppliers
• Notes on the need for and performance of preventive maintenance and other repairs
Colorado Civil Group, Inc. 15
Elizabeth Subdivision
Erosion Control Report
January 2018
• Implementation of specific items in the ECP
• Training events (given or attended)
• Events involving materials handling and storage
• Contacts with regulatory agencies and personnel
• Notes of employee activities, contact, notifications, etc.
This information can also be found in Part I.D.6 of the Construction Permit and should be
referenced often to ensure adequate inspection practices are followed.
Colorado Civil Group, Inc. 16
Elizabeth Subdivision
Erosion Control Report
January 2018
Appendix A: General Permit Application
A
LJ
Elizabeth Subdivision
Erosion Control Report
January 2018
Appendix B: Existing Soil Information
B
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Drainage Class
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Map unit symbol
Map unit name
Rating
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Description
"Drainage class (natural)" refers to the frequency and duration of wet periods under
conditions similar to those under which the soil formed. Alterations of the water
regime by human activities, either through drainage or irrigation, are not a
consideration unless they have significantly changed the morphology of the soil.
Seven classes of natural soil drainage are recognized -excessively drained,
somewhat excessively drained, well drained, moderately well drained, somewhat
poorly drained, poorly drained, and very poorly drained. These classes are defined
in the "Soil Survey Manual."
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie -break Rule: Higher
uSDA Natural Resources Web Soil Survey 2/25/2016
2W Conservation Service National Cooperative Soil Survey Page 3 of 3
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Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map 'Unit - Larimer County Area, Colorado (CO644)
Map unit symbol
Map unit name
Rating
Acres in AOl
Percent of AOI
94
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percent slopes
B
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Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long -duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay layer
at or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
lfja soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
far drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
USDA Natural Resources Web Soil Survey
211111111111 Conservation Service National Cooperative Soil Survey
2/25/2016
Page 3 of 4
Hydrologic Soil Group—Larimer County Area, Colorado
Component Percent Cutoff.- None Specified
Tie -break Rule: Higher
t1SOW Natural Resources Web Soil Survey 2/2512016
Conservation Service National Cooperative Soil Survey Page 4 of 4
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Wind Erodibility Group
Wind Erodibility Group- Summary by Map Unit — Lorimer County Area, Colorado (CO644)
Map unit symbol
Map unit name
Rating
Acres in Act
Percent of AOI
94
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percent slopes
5
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53.0%
95
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percent slopes
5
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0.8
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Description
A wind erodibility group (WEG) consists of soils that have similar properties
affecting their susceptibility to wind erosion in cultivated areas. The soils assigned
to group 1 are the most susceptible to wind erosion, and those assigned to group
8 are the least susceptible.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie -break Rule: Lower
USDA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
2/25/2016
Page 3 of 3
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Wind Erodibility Index
Wind Erodibility Index —Summary by Map uriit— Larimer County Area, Colorado (CO644)'
Map unit symbol
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Description
The wind erodibility index is a numerical value indicating the susceptibility of soil to
wind erosion, or the tons per acre per year that can be expected to be lost to wind
erosion. There is a close correlation between wind erosion and the texture of the
surface layer, the size and durability of surface clods, rock fragments, organic
matter, and a calcareous reaction. Soil moisture and frozen soil layers also
influence wind erosion.
Rating Options
Units of Measure: tons per acre per year
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie -break Rule: Higher
USDA Natural Resources Web Soil Survey
Niiiiiiiiii Conservation Service National Cooperative Soil Survey
2/2512016
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Elizabeth Subdivision
Erosion Control Report
January 2018
Appendix C: Erosion Control Plan and Details
c
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