HomeMy WebLinkAboutVOICE OF TRUTH TABERNACLE - PDP200011 - SUBMITTAL DOCUMENTS - ROUND 1 - EROSION CONTROL LETTER/REPORTTABLE OF CONTENTS
Title Page
Vicinity Map
Table of Contents
I. PROJECT DESCRIPTION AND NATURE OF CONSTRUCTION ............................. 1
A. Site location and contact information .......................................................................... 1
B. Existing Site Condition .................................................................................................. 1
C. Proposed Construction Activities ................................................................................. 3
II. POTENTIAL POLLUTANT SOURCES…………………………………………………3
III. INSTALLATION AND REMOVAL SEQUENCE OF CONTROL MEASURES…….8
IV. FINAL VEGETATION AND STABILIZATION AND EROSION CONTROL
ESCROW…………………………………………………………………………………...9
V. CONCLUSIONS ................................................................................................................. 10
A. Compliance with Standards ........................................................................................ 10
VI. REFERENCES……………………………………………………………………………10
APPENDIX I
Sediment/Erosion Control and Water Quality Plan (Interim)
Landscape Plans
Erosion Control Security Deposit Estimate
Page 1
Erosion Control Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
I. PROJECT DESCRIPTION AND NATURE OF CONSTRUCTION
A. Site location and contact information
1. The property is bounded by Tract One, Dix Amended Plat on the south. There
is an existing residence on Tract One. The property is bounded by Outlot A,
Dix Amended Plat on the north and east. Tract A, Dix Amended Plat is
currently undeveloped. The property is bounded by North Timberline Road
on the west. The existing site address is 1108 North Timberline Road Fort
Collins, Colorado.
2. Refer to the vicinity map located near the beginning of this report.
Developer / General Contractor / SWMP Administrator
Voice of Truth Tabernacle
Attn: Tito Moreira
1132 Sawtooth Oak Court
Fort Collins, CO 80525
Phone: (970) 430-5083
Email: tito.moreira@gmail.com
Property Owner
Voice of Truth Tabernacle
Attn: Tito Moreira
1132 Sawtooth Oak Court
Fort Collins, CO 80525
Phone: (970) 430-5083
Email: tito.moreira@gmail.com
Design Engineer
Shear Engineering Corporation
4836 South College Avenue, Suite 12
Fort Collins, CO 80525
Phone: (970) 226-5334
Email: bshear@shearengineering.com
B. Existing Site Condition
1. Approximately 45% of the site consists of Fort Collins Loam Hydrologic
Group C, is well drained with low runoff potential. Approximately 40% of
the site consists Nunn Clay Loam Hydrologic Group C, is well drained with
medium runoff potential.
Approximately 15% of the site consists of Stoneham loam Hydrologic Group
C, is well drained with low runoff potential. The site consists of a three to six
inch vegetative and top soil layer over sandy lean clay according to the
Page 2
Erosion Control Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
Geotechnical Subsurface Exploration Report for the Voice of Truth
Tabernacle by Soilogic, titled “Geotechnical Subsurface Exploration Report
For Lot 1, Voice of Truth Tabernacle Subdivision Located At, 1108 North
Timberline Road, City of Fort Collins, Colorado” for Voice of Truth
Tabernacle; Soilogic Project No. 19-1028; report dated January 30, 2020.
Voice of Truth Tabernacle Subdivision has a total project area of
approximately 3.00 acres.
2. The site has slight to moderate slopes from 1%-5% and drains toward the
north and east through Outlot A, Dix Amended Plat.
3. Prior to dirt work operations, the site vegetation consists primarily of native
and non-native grasses. The total disturbed area will be approximately 2.75
acres. These grasses naturally grow in clumps, which inevitably leads to some
bare areas. In general, the site has approximately 60% vegetative cover.
4. With the geotechnical exploration report groundwater levels were not
encountered in the test borings. Voice of Truth Tabernacle Subdivision will
consist of a Church building and post frame building addition.
5. There is no known on-site ground contamination.
Page 3
Erosion Control Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
C. Proposed Construction Activities
1. Voice of Truth Tabernacle Subdivision has a total project area of
approximately 3.09 acres. The project will consist of constructing a Church
building and post frame building addition that meets the requirements of the
City of Fort Collins Land Use Code.
2. There are no wetlands or streams on-site.
II. POTENTIAL POLLUTANT SOURCES
1. The following potential sources of pollution have been evaluated:
a. Disturbed and stored soils-Yes-Approximately 2.75 acres or 75% of the
3.00-acre site will be disturbed with 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. Disturbed and stored soils will be prevented
from leaving the site using wattles and rock sock protection. Surface
roughening shall be completed at disturbed soil areas, to help minimize
wind and water erosion. If soil manages to migrate from the disturbed
areas onto the street it will be swept or scraped to prevent the migration
of sediment. Stockpiles in the same respect do not retain the same
compaction and are more susceptible to soil erosion. Stockpiles on this
site shall be placed in or near the center of the site and away from any
drainage swales to not require perimeter run off controls. The stockpile
will be kept loose, not compacted, and watered as needed to prevent dust
issues. The stockpile will be monitored for signs of erosion
displacement and sediment accumulation and if conditions warrant it,
the stockpile will be structurally covered or if it is going to sit a long
while will be temporarily reseeded. The installations and site
management control noted above will help to prevent disturbed and
stored soils from leaving the site and reduce the amount of erosion
materials reaching undisturbed areas.
b. Vehicle Tracking of Sediment-Yes-Vehicle tracking control of
sediments will occur at the west entrance of the site at the proposed drive
isle. Vehicle tracking control will reduce the materials reaching the
existing road. Frequent scraping and sweeping maintenance and
removal of materials at this location will be required. All contractors
have signed contracts that will have them clean the streets if they are
found to be tracking dirt onto the street.
c. Management of Contaminated Soil-No-There is no known
contamination on the site. If encountered, the contractor will have the
Page 4
Erosion Control Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
material stored in a covered area as to not mix with the stormwater until
the material can be identified and proper classification and disposal
methods can be determined in accordance with the various waste laws
and with good construction safety and practices.
d. Loading and Unloading Operations-Yes- Construction loading and
unloading operations will occur and shall be completed in such a way
that does not contribute pollutants to runoff. There will be loading and
unloading for foundation and utility work, dirt work and landscaping.
Access to the site will be limited to one location at the west side of the
site. The contractor will be responsible for the proper handling and
management of pollution sources during loading and unloading. When
loading and unloading is occurring, depending on the materials, there
may be an increased problem of containers being dropped, punctured,
or broken. These off-loading activities will be done away from swales
and will have nearby spill kits accessible. Spills on site will be
addressed using spill prevention and response procedures.
e. Outdoor storage activities-Yes- It is anticipated that inert material like
wood, shingles, tiles, siding insulation and stone will be stored on site
and outside in the elements. It is also anticipated that materials that do
not weather well (cement, mortar, etc.) will also be located outside.
Chemicals are not anticipated to be left outside. As the inert materials
have a lower potential to leave the site, they will be monitored during
inspection to make sure they are not being impacted by the exposure to
the elements. The materials that will need added attention are the
cements and mortars as they quickly mix with water and cause pollution
issues. These materials when not stored inside will be placed on pallets
to get above potential surface runoff and covered with tarps or plastic to
prevent mixing with stormwater. Very small quantities of chemical are
needed to contaminate stormwater so the fertilizers, paints, form oils,
petroleum products, and other typical chemicals, will be stored in the
construction connex box, trailers, vehicles, or the like out of contact
with precipitation. If not stored in a location as described, secondary
containment will be required.
f. Bulk storage of Materials-No-Based on the size of this project bulk
storage will be unlikely.
Page 5
Erosion Control Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
g. Vehicle and equipment maintenance and fueling-Yes- As fueling and
equipment maintenance usually result in small spills of petroleum
products it is important to monitor these activities carefully. In those
cases where the vehicle is not able to be maintained off site, these
activities will be done in the least detrimental way possible. The
maintenance and fueling will be located as far from stormwater features
as possible and at least 50 feet from a stormwater feature. The fueling
activity will have spill materials nearby and a bucket or other container
and shovel located nearby to hang a hose after filling to catch drips, and
to scoop up any dirt that inadvertently mixed with the soil. That
container will have a lid and be disposed of when the activity is
completed. The maintenance work will be done on a tarp or other
material to prevent the residual oils and greases from mixing with the
dirt.
h. Dust or Particulate Generating Processes – Yes – This project will result
in earth moving activities, street sweeping, and track-out and carry out
and saw cutting. The project will follow all required “BMPs” articulated
in the Fugitive Dust Manual and at least one additional BMP included
during each of the identified activities in accordance with City
Ordinance No. 044,2016. Such activities will include but not limited to
watering the site, covering trucks, slower site speeds and vehicle
tracking mentioned above.
i. Routine Maintenance Activities (Fertilizer, Pesticides, Detergents,
Fuels, Solvents, Oils, etc.) – Yes – Fertilizers and Pesticides will be used
during the later phases of the project when trying to establish a healthy
vegetation. These chemicals are highly water soluble and are easily and
unnoticeably carried in the stormwater. Proper application rates and
recommended timing of application will be strictly followed and not on
days, or the next day, where the weather is calling for precipitation. As
most of these types of chemicals will be brought on by the Landscaper,
they will be required to keep these products in their vehicles until time
of application and not be allowed to leave these materials on the site. If
these materials are stored on site, they shall be kept inside or outside
covered and above the ground to prevent the materials from mixing with
water and runoff. Detergents, paints, acids, cement, grout, and solvents
will be prevalent in the interior work of the building. These materials
also are typically easily mixed with water yet are typically noticeable
by discolored, cloudy, or sudsy water. As such, the contractor will
always keep an eye out for these types of differences in water around
the site. However, these materials are to be handled, operated, and
cleaned up all within the inside of the structure, where external use is
concerned these materials will be stored in the construction connex box,
trailers, vehicles, or the like out of contact with precipitation.
Page 6
Erosion Control Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
If not stored in a location as described secondary containment will be
required. Fuels and oils might be associated with the smaller equipment
used on site, chainsaws, pumps, generators, etc. As petroleum products
are easily suspended in water and are spread across the top of the water
surface. These products when located in water have rainbow sheen on
them. They are also monitored during construction. These products will
be stored in the construction connex box, trailers, vehicles, or similar
structure that will minimize contact with precipitation. If not stored in a
location as described secondary containment will be required. Any
untreated runoff from these activities can be detrimental to wildlife if
not cleaned up.
j. On-site waste management practices (Waste Piles, Liquid Wastes,
Dumpsters, etc.) – Yes –All large and heavy weighted waste piles
(concrete chunks, excavated pipes, etc.) will be kept in a neat grouped
pile until the material is to be disposed of properly. These piles will only
be stored a short duration 5-10 days and will be kept 50 feet from any
drainage course or inlet. All dry wastes will be maintained through
dumpsters and monthly hauler removal (hauler will be notified if
dumpster becomes full and hauled off as needed). Where available by
the hauling company the dumpster will be covered. If not practical or
available by the haul company, an increased removal schedule will be
followed and the “Max fill line” on the dumpster will be strictly
followed. Corners of the dumpsters will be monitored for “Dumpster
Juice” leaking into the soil in dry conditions and rain/melt off conditions
looking for it mixing with the runoff. Dumpsters, like the waste piles,
will be located at least 50 feet from any drainage course or inlet.
Workers will be sent around at the end of the day to collect trash to
prevent trash being left out overnight. No construction debris (including
broken concrete) will be buried on site.
k. Concrete Truck/Equipment washing – Yes – Concrete will be installed
with this project. It is anticipated that it will be used with the Church
building foundation and sidewalks. Pre mixed concrete trucks will be
used in this process and will be delivered to the site and when pouring
the foundation a pump truck will be used all of which will need to be
maintained through the washing of their chutes and pump arms to
prevent the concrete from hardening and ruining the equipment. This
concrete wash water has a high alkaline content which is hazardous
material to terrestrial and aquatic wildlife. A section of dirt near the
entrance will be excavated and compacted around the sides formed to
retain the concrete wash water on site (as an acceptable practice by the
State) so long as the wash water is kept in the washout (concrete
washout). There will be a rock pad for the truck to park on while
washing as to prevent tracking from this washout (VTC).
Page 7
Erosion Control Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
The placement of this washout will be located at least 50 feet from any
drainage course or inlet. Later in the project after foundation
installations the use of a mobile washout facility will be used on site in
a similar location and after the ground has been leveled (concrete
washout – mobile). The contractor (including all masonry and concrete
tradesmen) shall clean out equipment within the washout area so that
the runoff is not allowed to leave the washout. The only exception would
be for them to wash in the next day’s pour location. All concrete workers
will be made aware of the where they are to wash. If there is a significant
amount of spillage when the transfer from concrete truck to pump truck
occurs, a tarp or other ground cloth should be used to collect spillage.
l. Dedicated asphalt or concrete batch plant – No – there will be no
dedicated asphalt or concrete batch plants erected onsite for this project.
Premixed concrete materials will be delivered to the site and placed.
m. Non-industrial waste sources (Worker Trash and Portable Toilets) —
Yes – Since facilities are not located nearby for workers to use, trash
and sanitary facilities will be required on the site. Worker trash will be
comingled with the industrial trash and will follow the same controls
with the requirement that a trashcan will be located near the entrance of
the site as the contractor will need to dump their trash from lunch, etc.
and this will be emptied weekly or more frequently, if needed. If tipped
over and when being cleaned, portable toilet facilities become a
potential discharge if not cleaned up. If human waste is spilled, it will
need to be treated as a biological hazard of untreated sewage and will
need to be cleaned up in accordance with Larimer County Health
Department Guidance. The toilets will be staked in a way to prevent
tipping on a dirt surface and located at least 50 feet from a drainage
course or inlet. If the site cannot accommodate a portable toilet on dirt,
a containment pan or other secondary containment will be provided.
They will also be anchored prevent from tipping. All materials shall be
properly disposed of in accordance with the law.
n. Saw Cutting and Grinding -Yes- Saw cutting the asphalt in the City
right-of-way and street will occur. This project will need the use of
hardened saws. These saws generate a significant amount of dust.
Watering the cutting surface to prevent airborne particulates (BMP in
the City’s Fugitive Dust Manual) is required. The cutting slurry has a
high content of fine particulates (Silica Dust, Metals, etc.) that is not
allowed to discharge as runoff from the site.
Page 8
Erosion Control Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
To prevent slurry from discharging offsite, contractors will use the
minimum amount of water needed to prevent dust and blades from
overheating. Cutting slurry will be collected via vacuum or allowed to
dry out and be scraped and swept up after the cutting has finished (saw
cutting).
o. Ground Water Dewatering – No – Based upon the geotechnical data,
ground water was not encountered 5'-15' below existing grade.
However, if encountered, dewatering activities may be required.
Groundwater has in most excavations mixed with the dirt and as they
are pumped, they will add an increased velocity coming out of the out-
flow end contributing to erosion and speeding the transport of the
suspended sediment particles. Also, construction dewatering activities
must be identified in the Erosion Control Report if they are to be
infiltrated on site. If the material is anticipated to be pumped to a
stormwater conveyance the proper Construction Dewatering Permit
must be pulled from the State of Colorado. If pumping activities are to
occur on the site, the use of rock packs on the intake end of the pump
will be used and a silt bag will be used on the outflow end of the pump
to reduce the silt and sediment from leaving the activity. If this will be
under a Dewatering Permit water samples will be collected in
accordance with that permit.
III. INSTALLATION AND REMOVAL SEQUENCE OF CONTROL MEASURES
1. The following temporary BMP’s measures are specified on the
Sediment/Erosion Control and Water Quality Plan (Interim). Refer to
sequence schedule on this plan for the installation and removal of these
control measures.
a. Wattles (Site Mobilization – Completion of Landscaping) Wattle
installations shall be installed to reduce erosion prior to runoff reaching
adjacent undisturbed areas. Wattles shall be installed in general
compliance with the installation detail on the Detail Sheet. Wattles shall
be inspected and maintained on biweekly basis and within twenty-four
(24) hours of a storm event. Wattles shall remain in place until
contributing drainage areas are sufficiently stabilized.
Page 9
Erosion Control Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
b. Vehicle Tracking Pad (Site Mobilization – Completion of Flat work)
All vehicle tracking control pads shall be installed prior to any
Construction Activity (stockpiling, stripping, grading, etc.) being used
during any of the future construction phases. Vehicle tracking control
pads are to be installed prior to site excavation or earthwork activities.
Tracking pads shall be removed once activities that require going from
dirt to hardscape stop on the project. Vehicle tracking control pads shall
be installed in general compliance with the installation detail on the
Detail Sheet.
c. Concrete Washout Area (Concrete Foundation Installations –
Completion of Concrete Foundations and Flat work) Washout location
is shown on the Sediment/Erosion Control and Water Quality Plan
(Interim) and the installation detail is shown on the Detail Sheet. This
location is a suggestion and can be relocated at the discretion of the
Contractor while keeping it away from drainage courses.
d. Rock Sock Protection (Site Mobilization – Completion of Landscaping)
Rock Sock Protection installations shall be installed to reduce sediment
contribution to adjacent undisturbed areas. Curb Sock installation detail
is shown on the Detail Sheet.
IV. FINAL VEGETATION AND STABILIZATION AND EROSION CONTROL
ESCROW
1. Exposed dirt in areas that contain Hardscapes, Buildings, and Rock bed will
be considered to be stabilized immediately upon installation and would
prevent future Erosion to those areas. Those areas where sod will be installed
as per design, will require soil amending in accordance with §12-132 and
irrigated as a permanent feature to the project. Upon installation of those sod
areas they will be considered stabilized and will prevent further Erosion to
those areas. Those areas would then be under warranty. All areas to be seeded
as outlined in the Landscape Plan, or required by the City in the disturbance
of other properties, will have the area amended in accordance with §12-132
of City Municipal Code and be seeded based upon the specifications called
out in the Landscape Plan. A copy of the Landscape Plan is attached to the
report. All seeded areas will be crimped and mulched same day or next day
after seeding in accordance with the Temporary and Permanent Seeding
Details associated with this project as seen in the appendix, and in accordance
with the City of Fort Collins Erosion Control Criteria. Once installed there
will be no temporary irrigation system so all seeding will be monitored until
the site has reached a vegetative cover (density) of 70%. It is anticipated that
this site will be seeded in the spring of 2021 and will be fully established in
the fall of 2021.
Page 10
Erosion Control Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
At the point the vegetation has reached 70% density, and confirmed by the
City of Fort Collins, the warranty period for Erosion Control will begin, all
stormwater infrastructure will be clean and removed of any sediment deposits
and any remaining temporary Control Measures will be removed.
2. An erosion control security deposit is required in accordance with City of Fort
Collins policy. In no instance shall the amount of the security be less than
$3,000.00 for commercial development. See the Erosion Control Security
Deposit Requirements document located in Appendix I. The erosion control
security deposit is equal to $9,026.25.
V. CONCLUSIONS
A. Compliance with Standards
1. The erosion control measures for Voice of Truth Tabernacle Subdivision will
comply with the requirements of the City of Fort Collins Stormwater Criteria
Manual adopted December 2018 with Ordinance 159, 2018.
VI. REFERENCES
A. City of Fort Collins Stormwater Criteria Manual; City of Fort Collins,
adopted December 2018 with Ordinance 159, 2018
B. Urban Storm Drainage Criteria Manual Volume 1; Urban Drainage and Flood
Control District, Denver, Colorado, Updated January, 2016.
C. Urban Storm Drainage Criteria Manual Volume 2; Urban Drainage and Flood
Control District, Denver, Colorado, Updated January, 2016.
D. Urban Storm Drainage Criteria Manual Volume 3, Best Management Practices;
Urban Drainage and Flood Control District, Denver, Colorado, Updated November,
2010.
Project: Disturbed Acres: 2.75
li
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
EA. 1 $825.00 $825.00
L.F. 970 $2.75 $2,667.50
EA. 4 $150.00 $600.00
EA. 1 $1,925.00 $1,925.00
Sub-Total: $6,017.50
1.5 x Sub-Total: $9,026.25
Amount of security: $9,026.25
Total Acres x Price/acre: 2695
$980.00 Sub-Total: $2,695.00
1.5 x Sub-Total: $4,042.50
Amount to Re-seed: $4,042.50
Minimum escrow amount: $3,000.00
Erosion Control Escrow: $9,026.25
Fields in yellow should be amended for this project.
“The amount of the security must be based on one and one-half times the estimate of the cost to install the approved measures, or one and one-half times
the cost to re-vegetate the disturbed land to dry land grasses based upon unit cost determined by the City's Annual Revegetation and Stabilization Bid,
whichever is greater. In no instance, will the amount of security be less than one thousand five hundred dollars ($1,500) for residential development or three
thousand dollars ($3,000) for commercial development”
Vehicle Tracking Control (VTC)
Reseeding
Unit Price of Seeding per acre:
Minimum Escrow Amount
Final Escrow Amount
Erosion and Sediment Control Escrow/Security Calculation
for The City of Fort Collins
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
BMP Amount
Concrete Washout (CW)
Wattle (W)
Rock Sock (CSP)
7/15/2020 8:28 AM\\SERVER\Clients\V-Clients\Voice of Truth Tabernacle (Tito Moreira)\2978-01-18 Voice of Truth Tabernacle Sub\Documents\Drainage and floodplain\Erosion Control\Voice
of Truth Escrow