HomeMy WebLinkAboutRIDGEWOOD HILLS RESIDENCES, 4TH FILING - FDP - FDP130052 - REPORTS - STORMWATER MANAGEMENT PLANRidgewood Hills 4th Filing
Fort Collins, Colorado
STORMWATER MANAGEMENT PLAN
and
EROSION CONTROL PLAN
Prepared For:
M. Timm Development
233 Carillo Street
Santa Barbara, CA 93101
(805) 963-0358
Prepared By:
3715 Shallow Pond Dr., Fort Collins, CO 80528
Phone: 970-226-0264 Fax: 970-226-3760
larrycowen@comcast.net
August 07, 2014
Proj. No.: 111-122FC
Ridgewood Hills 4
th
Filing 08/07/2014
Storm Water Management & Erosion Control Plan
1
RIDGEWOOD HILLS 4TH FILIING
FORT COLLINS, COLORADO
STORM WATER MANAGEMENT PLAN
and
EROSION CONTROL PLAN
Site and Project Description
The proposed development is located in the Southeast Quarter of Section 14, Township 6
North, Range 69 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, State
of Colorado. The site is bounded on the west, south of Avondale Rd., by single-family
residential lots fronting onto Triangle Dr., on the north and west, north of Avondale Rd., by
Triangle Dr., on the east by vacant land, and on the south by single-family residential lots
fronting onto Peyton Dr. Adjacent land use to the south, west and north of the project site is
single-family residential, and to the east of the site, the vacant land immediately adjacent to the
site is designated for medium-density mixed-use neighborhood development, and beyond that
for neighborhood commercial development. The site is entirely within the bounds of the City of
Fort Collins.
The site comprises a total area of 10.4 acres. The property is currently vacant, but has been
used for agriculture in past. The current ground cover is a mix of native grasses.
The site slopes generally from west to east, at surface gradients ranging between 3.5% and
15%. There is a gentle ridge, however, that bisects the site along an axis aligned roughly from
northwest to southeast and generally corresponding to the alignment of Avondale Road, which
effectively subdivides the site into two natural drainage basins, both ultimately draining to the
east, but in the context of the site alone, one drains to the northeast and the other to the
southeast.
The native soils underlying the site are predominantly silty loams (Wiley loam – 65.6% of site
area; Fort Collins loam – 27.7% of site area; and Satanta loam – 6.7% of site area). All of these
soils fall within NRCS Hydrologic Soil Group B. A geotechnical engineering investigation that
was conducted at the site in 2004 characterized the subsurface soils as sandy, lean clays,
extending to depths in excess of 15 feet, in most areas of the site. At one boring location in the
northern portion of the site and at two locations in the southern portion of the site, weathered
siltstone/claystone bedrock was encountered at depths of approximately 11 – 12 feet. No
groundwater was encountered during initial boring or when the borings were reinspected
several days later.
Flood plain mapping for the vicinity of the development site indicates that no portion of the site
lies within any mapped floodplain area (unprinted FEMA FIRM Panel #08069C1200F).
The proposed development of the site will consist of multi-family residential buildings, including
146 dwelling units in 11 buildings (2-story and 3-story); 33 enclosed garages in three buildings;
a clubhouse, with adjoining pool / spa, sports court, tot lot and recreation area; paved access
driveways, sidewalks, and outdoor parking areas; and landscaped open space. Buildings will
cover approximately 19.8% of the site; paved drive aisles, sidewalks and vehicle parking areas
will cover approximately 29.2% of the site; and landscaped open space will account for 51.0% of
the site area.
Ridgewood Hills 4
th
Filing 08/07/2014
Storm Water Management & Erosion Control Plan
2
Access to the development will be via the eastward extension of Avondale Road from Triangle
Drive. The layout of the proposed development is shown as the base of the Drainage Plan,
which is included as an attachment to this report.
Municipal infrastructure for supply of potable water and collection of sanitary sewage is
available adjacent to the site in Triangle Drive, as well as at the end of Peyton Dr., south of the
site. Appropriate utility mains will be extended throughout the site to serve the development.
Electric power, natural gas, telephone and cablevision services are also available to serve the
development.
Stormwater runoff from the development will be directed via overland flow to appropriately sized
and located storm drain inlets and drainage piping, and conveyed to one of two existing off-site
detention basins; one located across Triangle Dr. from the north tip of the site, and the other
located south of Peyton Dr., approximately 250 feet south of the site.
Specific construction activities to be completed during the course of development will include
overlot grading; excavation; installation of underground utility services; construction of concrete
curb and gutter and drainage pans; asphalt paving of public streets, drive aisles and parking
areas; construction of L.I.D. pavers and bioswales; construction of project buildings;
development of exterior amenities areas; final grading; and installation of landscaping materials.
The layout of the proposed development is shown on the attached Erosion Control Plan.
For the current vacant state of the site, the Runoff Coefficient would range between
approximately 0.2 and 0.5, depending on storm intensity. Upon completion of the proposed
development, the composite 100-yr Runoff Coefficient for the site, “C100”, is calculated to be
0.56 and the composite Percent Imperviousness of the site is calculated to be 43.50%.
The general sequence of development activities at the site will include overlot grading;
installation of underground utilities; construction of new concrete curb and gutter, paved
roadways, driveways and parking areas (including L.I.D. pavers); construction of the buildings
and exterior paved amenities areas; construction of bioswales; final grading; and landscaping of
the open-space areas of the site. During the course of development, at one time or another, the
majority of the site will be disturbed, however, progressive development of the site will limit the
scope of the area of disturbance, such that not more than approximately 50% of the site is likely
to be disturbed at any one time.
The primary source of potential surface water contamination that may result from development
of the site is sediment that will be liberated due to construction operations. Other lesser
potential sources of contamination may include hydrocarbons from on-site fueling and servicing
of construction vehicles and equipment, as well as particulate and trace chemicals from
concrete and building construction activities. There are no other known or anticipated sources
of contamination that may impact the site runoff and downstream receiving waters.
Ridgewood Hills 4
th
Filing 08/07/2014
Storm Water Management & Erosion Control Plan
3
Construction Activities
As indicated above, as much as 50% of the site (a total of approximately 5.2 acres) will likely be
disturbed, at any one time, during the course of site development, building construction, final
grading and landscaping. There will not likely be a surplus of excavated soil from the
construction activities, so on-site stockpiling of soil, other than topsoil, will be limited. There will
be a need to haul fill material onto the site, but that material will be deposited and immediately
spread in its final location, without stockpiling. Topsoil stockpile(s) will be limited in height, and
will be located as far as possible from any permanent or interim drainage ways.
Construction materials will generally be delivered to the site as they are required, and stored in
close proximity to the work area or immediately incorporated into the permanent construction.
Imported construction materials, with the exception of import fill, will, for the most part, be non-
polluting (steel, concrete, brick, clean fill or construction aggregate, lumber, finishing materials,
etc.). There will not likely be any dedicated asphalt or concrete batch plants on-site.
Wherever possible, excavated native soils will be used for site fill and trench backfill, and this
material will be placed, spread and compacted immediately or stockpiled adjacent to the
excavation and reused as quickly as practicable in a tight operation. Precautions will be taken,
as described below, to limit erosion and transport of temporarily stockpiled material.
Best Management Practices (BMPs) for Erosion Control and Stormwater Pollution Prevention
Erosion and sediment transport from disturbed areas of the site present the most significant
potential for contaminant migration during construction activities at the site. Several structural
BMPs, common to most construction sites, will be implemented to limit this potential and to
mitigate impacts, as follows:
Silt fencing will be installed along the perimeters of the site, prior to initiation of any soil
disturbance. The silt fences will be maintained throughout the course of construction
activities.
Additional silt fencing and/or temporary diversion berms may also be installed along the
uphill perimeter of localized on-site disturbance areas, in order to minimize the inflow of
runoff from outside areas to the respective active construction areas.
Within the disturbed areas, the surface of exposed soils will be roughened along an
alignment that follows the site contours, to limit the flow path length of runoff water and to
promote infiltration of stormwater into the exposed soils.
Where deemed necessary, exposed soils will be stabilized with mulch or other approved
methods, to stabilize the exposed surface and limit erosion.
Temporary drainage swales will be established within the site, as necessary, to intercept
and divert storm runoff, and temporary sediment traps (silt fence, wattles, or other approved
materials) will be installed at appropriate intervals along the lengths of these temporary
swales to slow the velocity of runoff flows and to promote deposition of sediment and other
suspended solids.
Inlet protection will be installed at all storm drain inlets into which runoff from the site might
flow.
A vehicle tracking control pad will be constructed at the site construction access point along
Avondale Road to limit transport of mud or soil clods from the site onto the public streets via
truck tires.
Ridgewood Hills 4
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Storm Water Management & Erosion Control Plan
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Existing pavement will be swept as necessary, to remove dirt and/or debris that might be
tracked beyond the site by local traffic.
In addition to the structural BMPs listed above, several non-structural BMPs will also be
implemented as part of the construction program, in order to limit erosion and sediment
transport.
The construction activities will be advanced in a manner designed to maintain a compact
scope of construction activities within the site at any given time.
Construction activities will be kept tight and excavations will be backfilled as promptly as
practical, in order to limit the number and extent of exposed temporary soil stockpiles.
Soil stockpiles and other exposed soils will be wetted, as necessary, to control dust
generation.
Where it is necessary to have soil stockpiles or other significant areas of exposed soil on
site for an extended period of time, consideration will be given to applying synthetic covers
or durable, membrane-forming surfactants on these surfaces, to limit the potential for
erosion or dust generation.
In addition to soil erosion and sediment transport, a further, but considerably lesser risk of
contaminant migration may be presented due to spills or leaks during equipment fueling and
maintenance, materials handling and storage, or waste disposal. Equipment fueling and
maintenance will be ongoing daily activities, throughout the course of construction activities.
However:
On-site storage of bulk fuels, lubricants and solvents will be minimized.
Where practicality and efficiency necessitate having a certain supply of such potential
contaminants on-site, they will be stored in approved containers and at locations well
removed from drainage flow paths.
If bulk fuel is stored on-site, approved secondary containment facilities will be established at
the storage location.
Fueling and servicing of vehicles and equipment will be conducted in areas that are away
from drainage swales and other potential runoff flow paths.
In the event of a spill or leak during fueling or servicing, contaminated soils will be promptly
collected and properly secured or disposed of in an approved facility. In addition,
appropriate notification will be given and documentation of the cleanup maintained. Contact
numbers for project personnel are provided at the end of this SWMP.
Materials and supplies will be delivered to the site on an ongoing basis to support construction
activities. Appropriate handling and storage procedures will be implemented to limit any
potential for contamination of storm water being discharged from the site.
Most materials will be delivered to the site as they are needed, and will be promptly
incorporated into the permanent works.
There will be very little on-site materials storage, and only a small percentage of those
materials that are stored on-site will constitute a potential source of contamination.
If it becomes necessary to store potentially hazardous or contaminating materials on-site,
they will be stored in a secure, protected area to minimize the risk of exposure or migration.
As necessary, indoor or covered storage will be provided, and secondary containment will
be established.
Ridgewood Hills 4
th
Filing 08/07/2014
Storm Water Management & Erosion Control Plan
5
Handling and disposal of waste and debris will also be regulated in order to avoid creation of
unnecessary sources of potential contamination.
All subcontractors will be required to maintain a neat and tidy operation, regularly cleaning
up and removing excess materials, construction spoil and debris.
Sanitary waste facilities (Porta-Potties) will be located away from drainage channels and will
be regularly maintained and serviced.
All subcontractors will be required to dispose of construction waste in approved, covered
containers, which will be regularly removed from the site to an approved waste disposal
facility.
Clean-up or decontamination of construction equipment, including washout of concrete
mixers, will be performed in a designated area of the site, well removed from drainage paths
and storm water management facilities.
Potential contaminants from such activities will be contained and, if necessary, collected for
appropriate disposal.
Final Site Stabilization and Long-Term Storm Water Management
As soon as practicable after completion of construction activities in a given area of the site,
permanent landscaping will be installed including trees, shrubs, seeding and crimping, sodding,
weed barrier, mulch and plant materials, per the approved Landscape Plan. See the
Revegetation Specification in the appendix for the seed mix ratio. All landscaping will comply
with the Fort Collins Municipal Code Soil Amendment, Sections 12-130 through 12-132.
If climatic conditions, at any given time, are not suitable for planting and timely establishment of
new vegetation, interim measures will be taken to limit the potential for erosion and sediment
transport, and such measures will be maintained until permanent actions can be effectively
implemented. Such interim measures may include mulching or application of erosion mats
and/or surfactants, particularly on areas that may be prone to erosion.
Inspection and Maintenance of Storm Water Management Facilities
All BMPs, and the site in general, will be inspected at least every 14 days, as well as after
significant storm events throughout the construction period, in order to assess the condition of
storm water management facilities and identify any need for maintenance, repair or replacement
of such facilities, to ensure their continued effectiveness. The frequency of regular inspections
will be not less than bi-weekly. During such inspections, particular attention will be given to
BMPs and other preventative measures where the risk or consequence of a failure is greatest
(e.g., in proximity to materials of significant concentration or toxicity, or closest to the site
discharge point, etc.). All inspections will be fully documented and records will be maintained
on site for reference and confirmation.
If a need for maintenance, repair or replacement of BMP’s is identified, the nature of the
problem will be documented, along with recommended actions and a timeline for completion of
the work. A follow-up inspection will be made to ensure that appropriate actions have been
taken and to ensure the continued adequacy and effectiveness of the construction stormwater
management system. The follow-up inspection will also be documented and filed with the
original inspection report.
Ridgewood Hills 4
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Storm Water Management & Erosion Control Plan
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Specific inspection and documentation will also be implemented after any extraordinary incident
or event, such as a spill or leak, with appropriate follow-up to ensure effective containment and
clean-up. The documentation of such an event will also address measures or procedures to be
implemented to avoid a recurrence.
In addition to inspection and incident reports, storm water management system records will also
include:
Documentation of the implementation or removal of BMPs.
Records of communications or correspondence with regulatory personnel
Details of and authorization for modifications to the SWMP
Maintenance and repairs records
Details of preventative maintenance activities
Pertinent photos, sketches and field memos.
Contact Information
The following individuals will be available for contact in the event of an on-site incident, or to
respond to questions regarding the implementation and/or compliance with this SWMP. In the
event that these individuals are no longer associated with the project, or when changes or
additions are made to the relevant contact information, an addendum to this SWMP will be
prepared providing updated information, and that addendum will be incorporated into the
original and all copies of the document.
Owner:
M. Timm Development
233 Carillo Street
Santa Barbara, CA 93101
(805) 963-0358
Att’n: Mr. Bill Timm
Contractor
To be determined.
Civil Engineering Consultant
Owen Consulting Group, Inc.
3715 Shallow Pond Drive
Fort Collins, CO 80528
970-226-0264
Att’n: Mr. Larry Owen, P.E.
In addition to the personnel listed above, the following agencies may/should be contacted in
certain situations:
For emergencies, always dial 911
Ridgewood Hills 4th Filing
Fort Collins, Colorado
Appendix
Ridgewood Hills 4th Filing, Fort Collins, CO PAGE 1 OF 2
03/04/2014
RIDGEWOOD HILLS 4TH FILING
Fort Collins, Colorado
STORM WATER MANAGEMENT PLAN
INSPECTION REPORT (Page 1 of 2)
Inspections/reports must be completed at least every fourteen (14) days and within 24 hours following
any rainfall or snowmelt event that causes erosion.
Inspection Type: Routine (every 14 calendar days) Pre-Storm Storm Post-Storm
Date: _______________________________ Week Ending: ___________________________
Weather/Storm Event Information:
Storm Start Time: ________________________ Storm Duration: ___________________________
Time Elapsed Since Last Storm: _____________ Approximate Amount of Rainfall (inches): ______
Based on the results of the inspection, necessary control modifications shall be implemented within seven (7)
calendar days. These reports shall be kept on file as part of the Storm Water Pollution Prevention Plan for at least
five (5) years from the date of completion and submission of the Final Stabilization Certification/Termination Checklist
and Notice of Termination. A copy of the SWMP shall be kept at the site at all times during construction.
Certification Statement:
“I certify under penalty of law that this document and all attachments were prepared under my direction or supervision
in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the
information submitted. Based on my inquiry of the person or persons who manage the system, or those persons
directly responsible for gathering information, the information submitted is, to the best of my knowledge and belief,
true, accurate, and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fine and imprisonment for knowing violations.”
Name of Inspector: _________________________________ Title of Inspector: ____________________________
Qualifications of Inspector:
Inspector’s Signature:
Construction phasing/sequencing is consistent with the SWMP and Erosion Control Plans: Yes No
Compliance Certification
I certify that, based on there being no incidents of non-compliance identified during the inspection, the site is
in compliance with the SWMP and the Construction General Permit.
Name of duly authorized representative (Printed):
Signature of duly authorized representative:
Date:
*Note: This Compliance Certification is only to be signed by a duly authorized representative (Project Manager) when
there are no “unsatisfactory” conditions and the construction phasing/sequencing is consistent with the SWMP,
rendering the site in full compliance with the SWMP and the Construction General Permit.
Ridgewood Hills 4th Filing, Fort Collins, CO PAGE 2 OF 2
03/04/2014
Form C-1 Continued
Inspection Areas
(Structural)
Satisfactory
Unsatisfactory
(provide location or
numeric identification
per plan sheet)
N/A Corrective Action Required
Implementation Date
of Corrective Action
Construction Entrance/Exit
Perimeter Silt Fence
Inlet Protection
Outlet Protection
Temporary Drainage Swales
Temporary Sediment Basin
Material Laydown/
Staging Area
Underground Storm Sewer
Curb & Gutter System
Storm Water Detention Basin
Vehicle / Equipment Service
Area
Soil Stockpile Area
Material Storage Areas
Waste Storage Areas
Discharges of Sediments or
Other Pollutants from Site
Project Manager: ________________________________________
REVEGETATION SPECIFICATION
Disturbed areas of the site shall be prepared and revegetated in accordance with the
following specification.
Clearing and Site Preparation
Prior to any soil preparation, existing vegetation, which is to remain and which might
interfere with the specified soil preparation, shall be mowed, grubbed, raked and the debris
removed from the site. Prior to, or during grading or tillage operations, the ground surface shall
be cleared of materials that might hinder final operations.
Rip all areas to be planted, seeded and/or sodded to a minimum depth of 8 inches in two
directions, using an agricultural ripper with tines spaced at no greater than 18 inches. Areas
adjacent to walks, structures, curbs, etc., where the use of large mechanical equipment is
difficult, shall be worked with smaller equipment or by hand.
Soil Preparation
Spread compost at an application rate of 3 c.y. / 1,000 s.f. and fertilizer in accordance with
manufacturer’s recommendations, over all areas to be seeded, sodded and/or planted with
trees, shrubs or ground cover. Incorporate compost by disking or rototilling into the top six
inches minimum of soil. Obtain a uniform mixture, with no pockets of soil or amendments
remaining.
Restore the fine grade of all areas to be planted, seeded and/or sodded, with float drag to
remove irregularities resulting from tilling operations. Float drag in two directions. Remove any
stones over 1 1/2 inches in diameter that have come to the surface. Upon completion of finish
grading operations, the Contractor must provide a finished landscape grade that conforms to the
grades and elevations shown on the engineering drawings. The Contractor shall ensure that
the grade promotes positive drainage in all landscaped areas.
Compost
Compost shall be a totally organic product that has been aerobically and naturally
processed, without the addition of coarse wood chips, to create the following characteristics,
measured by dry weight:
Maximum allowable organic matter: 60%
Organic matter to nitrogen ratio: 25:1 to 30:1
pH 7 to 8
pH Salts 2.0 to 3.0
Inorganic matter: Less than 25%
Soil, dirt or sand maximum particle size: ½ in diameter
Fertilizer
Fertilizer for turf shall be commercial type, of uniform composition, free-flowing, and
conforming to applicable State and Federal laws. Contractor shall submit formulated
Manufacturer’s guaranteed analysis.
Seed
All seeding shall be completed between April 15 and May 31, or between September 1 and
October 15. Seeded turf areas shall be seeded with the following blend, at an application rate
of 5 lbs / 1,000 s.f.:
Ward Bluegrass 30%
Sandberg Bluegrass 25%
Rocky Mountain Fescue 25%
Sheep Fescue 25%
After seeding, the area shall be crimped with straw and provided with permanent irrigation.
The Contractor shall monitor the seeded area to ensure that the area is being properly irrigated,
that seed germination and establishment is occurring, and that erosion protection BMP’s remain
effective. Reseeding shall be implemented, as necessary, to obtain even coverage of grass.
Mulch
Mulch shall be applied at a rate of two tons / acre (4,000 lbs / ac), and shall be mechanically
crimped to a depth of two inches, using a purpose-made crimper. Where mechanical crimping
is not possible, mulch shall be hand crimped and covered with a tackifier. All mulch shall be
crimped such that the individual pieces of straw or hay form exaggerated V-shapes, protruding
out of the ground several inches.
DESIGN WORKSHEET
Client: M. Timm Development Job No.: 111-000FC
Project: Ridgewood Hills 4th Filing By: MAP Date: 03/04/2014
Task: Erosion Control Security Deposit Checked: CAG Date:
Page: 1 of: 2
According to current City of Fort Collins policy, a project’s erosion control security
deposit is based on the larger of:
1.5 times the estimated cost of installing the approved erosion control measures, or
1.5 times the cost to re-vegetate the anticipated area to be disturbed by
construction activity.
INSTALLATION OF APPROVED EROSION CONTROL MEASURES
ITEM QUANTITY UNIT PRICE TOTAL
Silt Fence 3618 lf $ 1.90 $ 6,874.20
Rock Dike 9 Each $ 300.00 $ 2,700.00
Inlet Protection 37 Each $ 150.00 $ 5,550.00
Vehicle tracking pad 1 Each $ 1,750.00 $ 1,750.00
SUBTOTAL $15,074.20
SUBTOTAL TIMES 1.5 $22,611.30
REVEGETATION OF DISTURBED AREA
ITEM QUANTITY UNIT PRICE TOTAL
Seeding/Mulching 4.00 ac $ 843.00 $ 3,372.00
SUBTOTAL $ 3,372.00
SUBTOTAL TIMES 1.5 $ 5,058.00
Client: M. Timm Development Job No.: 111122FC
Project: Ridgewood Hills 4th Filiing Date: 03/04/2014
Task: Erosion Control Security Deposit Page: 2 of 2
An erosion control security deposit is required in accordance with City of Fort Collins
Stormwater Utility policy. In no instance shall the amount of the security be less than
$1000.00.
1. According to current City of Fort Collins policy, the erosion control security
deposit is figured based on the larger amount of 1.5 times the estimated cost of
installing the approved erosion control measures or 1.5 times the cost to re-
vegetate the anticipated area to be disturbed by construction activity.
a. Based on current unit price data provided by a local erosion control company,
the cost to install the proposed erosion control measures is approximately
$15,074.20. As per City requirements, 1.5 times the cost to install the erosion
control measures is $22,611.30.
b. Based on current unit price data provided by a local erosion control company,
and based on an actual anticipated net affected area which will be disturbed
by construction activity (approximately 4.00 acres), the estimated cost to re-
vegetate the disturbed area will be $3,372.00. As per City requirements, 1.5
times the cost to re-vegetate the disturbed area is $5,058.
CONCLUSION:
The erosion control security deposit amount required for Ridgewood Hills 4
th
Filing shall be $22,611.30.
1-800-922-1987
CENTER OF COLORADO
CALL UTILITY NOTIFICATION
NORTH
0 30' 60' 120'
SCALE: 1"= 60'-0"
180'
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL
LEGEND
(1.) THE EROSION CONTROL INSPECTOR MUST BE NOTIFIED AT LEAST TWENTY-FOUR (24) HOURS PRIOR TO
ANY CONSTRUCTION ON THIS SITE.
(2.) THERE SHALL BE NO EARTH-DISTURBING ACTIVITY OUTSIDE THE LIMITS DESIGNATED ON THE ACCEPTED
PLANS.
(3.) ALL REQUIRED PERIMETER SILT AND CONSTRUCTION FENCING SHALL BE INSTALLED PRIOR TO ANY LAND
DISTURBING ACTIVITY (STOCKPILING, STRIPPING, GRADING, ETC). ALL OTHER REQUIRED EROSION
CONTROL MEASURES SHALL BE INSTALLED AT THE APPROPRIATE TIME IN THE CONSTRUCTION SEQUENCE
AS INDICATED IN THE APPROVED PROJECT SCHEDULE, CONSTRUCTION PLANS, AND EROSION CONTROL
REPORT.
(4.) AT ALL TIMES DURING CONSTRUCTION, THE DEVELOPER SHALL BE RESPONSIBLE FOR PREVENTING AND
CONTROLLING ON-SITE EROSION INCLUDING KEEPING THE PROPERTY SUFFICIENTLY WATERED SO AS TO
MINIMIZE WIND BLOWN SEDIMENT. THE DEVELOPER SHALL ALSO BE RESPONSIBLE FOR INSTALLING AND
MAINTAINING ALL EROSION CONTROL FACILITIES SHOWN HEREIN.
(5.) PRE-DISTURBANCE VEGETATION SHALL BE PROTECTED AND RETAINED WHEREVER POSSIBLE. REMOVAL
OR DISTURBANCE OF EXISTING VEGETATION SHALL BE LIMITED TO THE AREA(S) REQUIRED FOR
IMMEDIATE CONSTRUCTION OPERATIONS, AND FOR THE SHORTEST PRACTICAL PERIOD OF TIME.
(6.) ALL SOILS EXPOSED DURING LAND DISTURBING ACTIVITY (STRIPPING, GRADING, UTILITY INSTALLATIONS,
STOCKPILING, FILLING, ETC.) SHALL BE KEPT IN A ROUGHENED CONDITION BY RIPPING OR DISKING ALONG
LAND CONTOURS UNTIL MULCH, VEGETATION, OR OTHER PERMANENT EROSION CONTROL BMPS ARE
INSTALLED. NO SOILS IN AREAS OUTSIDE PROJECT STREET RIGHTS-OF-WAY SHALL REMAIN EXPOSED BY
LAND DISTURBING ACTIVITY FOR MORE THAN THIRTY (30) DAYS BEFORE REQUIRED TEMPORARY OR
PERMANENT EROSION CONTROL (E.G. SEED/MULCH, LANDSCAPING, ETC.) IS INSTALLED, UNLESS
OTHERWISE APPROVED BY THE CITY/COUNTY.
(7.) IN ORDER TO MINIMIZE EROSION POTENTIAL, ALL TEMPORARY (STRUCTURAL) EROSION CONTROL
MEASURES SHALL:
(A.) BE INSPECTED AT A MINIMUM OF ONCE EVERY TWO (2) WEEKS AND AFTER EACH SIGNIFICANT STORM
EVENT AND REPAIRED OR RECONSTRUCTED AS NECESSARY IN ORDER TO ENSURE THE CONTINUED
PERFORMANCE OF THEIR INTENDED FUNCTION.
(B.) REMAIN IN PLACE UNTIL SUCH TIME AS ALL THE SURROUNDING DISTURBED AREAS ARE SUFFICIENTLY
STABILIZED AS DETERMINED BY THE EROSION CONTROL INSPECTOR.
(C.) BE REMOVED AFTER THE SITE HAS BEEN SUFFICIENTLY STABILIZED AS DETERMINED BY THE
EROSION CONTROL INSPECTOR.
(8.) WHEN TEMPORARY EROSION CONTROL MEASURES ARE REMOVED, THE DEVELOPER SHALL BE
RESPONSIBLE FOR THE CLEAN UP AND REMOVAL OF ALL SEDIMENT AND DEBRIS FROM ALL DRAINAGE
INFRASTRUCTURE AND OTHER PUBLIC FACILITIES.
(9.) THE CONTRACTOR SHALL IMMEDIATELY CLEAN UP ANY CONSTRUCTION MATERIALS INADVERTENTLY
DEPOSITED ON EXISTING STREETS, SIDEWALKS, OR OTHER PUBLIC RIGHTS OF WAY, AND MAKE SURE
STREETS AND WALKWAYS ARE CLEANED AT THE END OF EACH WORKING DAY.
(10.) ALL RETAINED SEDIMENTS, PARTICULARLY THOSE ON PAVED ROADWAY SURFACES, SHALL BE REMOVED
AND DISPOSED OF IN A MANNER AND LOCATION SO AS NOT TO CAUSE THEIR RELEASE INTO ANY WATERS
OF THE UNITED STATES.
(11.) NO SOIL STOCKPILE SHALL EXCEED TEN (10) FEET IN HEIGHT. ALL SOIL STOCKPILES SHALL BE
PROTECTED FROM SEDIMENT TRANSPORT BY SURFACE ROUGHENING, WATERING, AND PERIMETER SILT
FENCING. ANY SOIL STOCKPILE REMAINING AFTER THIRTY (30) DAYS SHALL BE SEEDED AND MULCHED.
(12.) THE STORMWATER VOLUME CAPACITY OF DETENTION PONDS WILL BE RESTORED AND STORM SEWER
LINES WILL BE CLEANED UPON COMPLETION OF THE PROJECT AND BEFORE TURNING THE MAINTENANCE
OVER TO THE CITY/COUNTY OR HOMEOWNERS ASSOCIATION (HOA).
(13.) CITY ORDINANCE AND COLORADO DISCHARGE PERMIT SYSTEM (CDPS) REQUIREMENTS MAKE IT
UNLAWFUL TO DISCHARGE OR ALLOW THE DISCHARGE OF ANY POLLUTANT OR CONTAMINATED WATER
FROM CONSTRUCTION SITES. POLLUTANTS INCLUDE, BUT ARE NOT LIMITED TO DISCARDED BUILDING
MATERIALS, CONCRETE TRUCK WASHOUT, CHEMICALS, OIL AND GAS PRODUCTS, LITTER, AND SANITARY
WASTE. THE DEVELOPER SHALL AT ALL TIMES TAKE WHATEVER MEASURES ARE NECESSARY TO ASSURE
THE PROPER CONTAINMENT AND DISPOSAL OF POLLUTANTS ON THE SITE IN ACCORDANCE WITH ANY AND
ALL APPLICABLE LOCAL, STATE, AND FEDERAL REGULATIONS.
(14.) A DESIGNATED AREA SHALL BE PROVIDED ON SITE FOR CONCRETE TRUCK CHUTE WASHOUT. THE AREA
SHALL BE CONSTRUCTED SO AS TO CONTAIN WASHOUT MATERIAL AND LOCATED AT LEAST FIFTY (50)
FEET AWAY FROM ANY WATERWAY DURING CONSTRUCTION. UPON COMPLETION OF CONSTRUCTION
ACTIVITIES THE CONCRETE WASHOUT MATERIAL WILL BE REMOVED AND PROPERLY DISPOSED OF PRIOR
TO THE AREA BEING RESTORED.
(15.) TO ENSURE THAT SEDIMENT DOES NOT MOVE OFF OF INDIVIDUAL LOTS ONE OR MORE OF THE
FOLLOWING SEDIMENT/EROSION CONTROL BMPS SHALL BE INSTALLED AND MAINTAINED UNTIL THE LOTS
ARE SUFFICIENTLY STABILIZED, AS DETERMINED BY THE EROSION CONTROL INSPECTOR.
(A.) ALONG LOT PERIMETER.
(B.) OTHER LOCATIONS, IF NEEDED.
(16.) CONDITIONS IN THE FIELD MAY WARRANT EROSION CONTROL MEASURES IN ADDITION TO WHAT IS
SHOWN ON THESE PLANS. THE DEVELOPER SHALL IMPLEMENT WHATEVER MEASURES ARE DETERMINED
NECESSARY, AS DIRECTED BY THE CITY/COUNTY.
Mobilization Fdn. Excav'n Site Grading Vertical Const. Flatwork Inst. Landscaping
Demobilization
Best Management Practices (BMP's)
Structural "Installation"
Silt Fence
Vehicle Tracking Pad
Inlet Protection (Any existing inlets
downstream of site)
Sediment Trap / Filter (in Detention Basin)
Contour Furrows (Ripping / Disking)
Flow Barriers / Wattle Dikes
Riprap Armoring
*All BMP's are to be removed once
construction is complete
Vegetative
Temporary Seeding / Planting
Any time the site will sit
dormant longer than 30 days.
Mulching / Sealant
Any time the site will sit
dormant longer than 30 days.
Sod Installation
Permanent Seeding / Planting
Rolled Products (Netting / Blankets / Mats)
Any time the site will sit
dormant longer than 30 days.
THIS DRAWING, AS AN INSTRUMENT OF SERVICE, IS AND SHALL REMAIN THE PROPERTY OF TFG DESIGN, LLC. AND SHALL NOT BE REPRODUCED, PUBLISHED OR USED IN ANY WAY WITHOUT THE PERMISSION OF THE
LANDSCAPE ARCHITECT.
1269 N Cleveland Ave, Loveland CO 80537
(970) 669.3737
design@tfgdesign.com www.tfgdesign.com
ATTN:
SHEET OF
SHEET NUMBER:
SHEET TITLE:
REVISIONS:
PROJECT INFORMATION:
OWNER:
DRAWN BY:
FILE LOCATION: T:\Projects\1000 General\1053 TFG\1053-001 RidgewoodHills4th\DWGS\C5.0_Erosion Control Plan.dwg
PLOT DATE: 11/19/2013 7:34 AM
PROJECT NUMBER:
DATE:
PHASE:
M. TIMM DEVELOPMENT
BILL TIMM
233 CARILLO STREET
SANTA BARBARA, CA 93101
(805) 963-0358
RIDGEWOOD HILLS
FOURTH FILING
AVONDALE RD & TRIANGLE
FORT COLLINS, COLORADO
111-122FC
AUG 07, 2014
FP
36
EROSION
CONTROL PLAN
4
4