HomeMy WebLinkAboutFAITH FAMILY HOSPITALITY TRANSITIONAL HOUSE - PDP - PDP160044 - SUBMITTAL DOCUMENTS - ROUND 1 - STORMWATER MANAGEMENT PLANSTORMWATER
MANAGEMENT PLAN (SWMP)
FOR
Faith Family
317-321 Sherwood Street
Fort Collins, CO 80521
Prepared for:
Kenny Lee Architecture Group Inc.
209 E 4th
Street
Loveland, CO 80537
Prepared by:
www.quality-engineering.com
2637 Midpoint Drive, Suite E
Fort Collins, Colorado 80524
(970) 416-7891
QE Project No: 7040-001
Date: November 14, 2016
Table of Contents
Introduction ..................................................................................................................................... 1
1.1 Stormwater Quality Statement ......................................................................................... 1
1.2 SWMP Objective.............................................................................................................. 1
1.3 Location ............................................................................................................................ 1
1.4 Project Description ........................................................................................................... 1
Site Description ............................................................................................................................... 2
2.1 Construction Activity Description ................................................................................... 2
2.2 Proposed Sequence for Major Activities .......................................................................... 2
2.3 Area Estimates.................................................................................................................. 2
2.4 Runoff Coefficient and Soil Description .......................................................................... 3
2.5 Existing Vegetation .......................................................................................................... 3
2.6 Location and Description of Other Potential Pollution Sources ...................................... 3
2.7 Non-Stormwater Components of Discharge .................................................................... 3
2.8 Minimization of Directly Connected Impervious Areas .................................................. 3
2.9 Receiving Waters ............................................................................................................. 3
BMPs for Stormwater Pollution Prevention ................................................................................... 4
3.1 Erosion and Sediment Controls ........................................................................................ 4
3.2 Erosion Control Sequencing............................................................................................. 6
3.3 Materials Handling and Spill Prevention ......................................................................... 7
Other Controls ................................................................................................................................. 7
Final Stabilization and Long-term Stormwater Quality.................................................................. 8
Inspection and Maintenance Procedures ......................................................................................... 8
References ..................................................................................................................................... 10
APPENDIX A ............................................................................................................................... 10
Introduction
1.1 Stormwater Quality Statement
Stormwater quality best management practices shall be implemented to minimize soil
erosion, sedimentation, increased pollutant loads and changed water flow characteristics
resulting from land disturbing activity, to the maximum extent practicable, so as to
minimize pollution of receiving waters.
1.2 SWMP Objective
The objective of this Stormwater Management Plan (SWMP) for Faith Family, is to
identify the Best Management Practices (BMP’s) which, when implemented, will meet the
requirements of the City of Fort Collins SWMP Standards. The SWMP goal is to, “Identify
possible pollutant sources that may contribute pollutants to stormwater, and identify
BMP’s that, when implemented, will reduce or eliminate any possible water quality
impacts. The SWMP must be completed and implemented at the time the project breaks
ground, and revised if necessary as construction proceeds to accurately reflect the
conditions and practices at the site.”
The SWMP is a “living” document which should be modified and updated through the
course of site construction. Pollutant sources should be continuously evaluated, BMP’s
selected, documented, implemented, and pollutant sources be re-evaluated (and the process
continued). A current copy of the SWMP shall be kept onsite at all times. A person familiar
with the SWMP and on-site construction activities and clean-up procedures should be
designated as the SWMP Administrator for the site. The SWMP Administrator will be
responsible for (but not limited to) inspections and inspection reports, personnel training,
regulatory agency contact, SWMP implementation and revisions, field notebooks, and
record keeping of employee activities, contacts, and notifications.
References are found in the Appendix regarding some of the requirements, restrictions, and
forms related to the SWMP.
1.3 Location
The proposed site is located in the southeast quarter (NE ¼) of Section 11, Township 7
North, Range 69 West of the 6th P.M. in Larimer County, Colorado. Specifically, the
property is located on Sherwood Street between Magnolia Street and Olive Street. The
property address is 317-321 Sherwood Street, Fort Collins, Colorado, 80521. (Please see
the vicinity map located in the Appendix A).
1.4 Project Description
The property’s parcel number are 9711420904 and 9711420903. The site is located on Lots
3 and 4, Block 73 Fort Collins Subdivision and is currently 0.436 acres of residential land
surrounded by the residential lots to the north and south, an alley to the west, and Sherwood
Street to the east. The site can be accessed from Sherwood Street and the existing alley.
Two gravel patches provide on-site parking and can be accessed from the alley.
The existing property is a residential building with no occupants that drains west to
Sherwood Street through a drainage channel along the north property line. Sherwood
Street drains south to the existing inlet, where it is conveyed to the Poudre River. Runoff
from the alley flows south to West Magnolia Street, where is flows east to an existing storm
inlet. There are generally no offsite flows that drain toward the property. The entire site is
located within the city flood fringe. The city floodway encompasses all of Sherwood Street
and West Magnolia Street and extends to the back of the sidewalk. (see City Flood Risk
Map in Appendix A).
According to the NRCS soils map survey, the native soils consist of Fort Collins Loam,
which is a Type “C” soils. These soils 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.
There are no irrigation facilities located within the proposed site area.
The proposed development will consist of the construction of an off-street parking lot that
will act as a parking for the residents and employees of Faith Family. The parking lot will
be paved asphalt. The existing gravel alley will also be paved with asphalt from the
northern property line to Magnolia Street.
Site Description
2.1 Construction Activity Description
Construction activity includes installation of BMP’s, grading, utility construction,
alley/parking lot construction, and drainage conveyance construction.
2.2 Proposed Sequence for Major Activities
The sequence for major construction activities includes the installation of BMP’s, overlot
grading including drainage conveyance construction, installation of utilities, final grading
of the lot and parking lot construction, and landscaping.
Construction is expected to occur in one phase. Construction is estimated to begin March
1, 2017 and be completed in June, 2017z+.
2.3 Area Estimates
The entire site area, 0.436 acres will be disturbed and will be referred to as the, “Limit of
disturbance.”
2.4 Runoff Coefficient and Soil Description
According to the NRCS Web Soil Survey maps, the majority of the site consists of:
Name Soil Type Erosion
Fort Collins Loam, 0 to 3 Percent Slope C Moderate
The soil erosion potential for soil type C is moderate.
2.5 Existing Vegetation
The site consists mostly of a grass lawn with mature trees scattered around the site.
2.6 Location and Description of Other Potential Pollution Sources
Potential pollutant sources include sediment, uncovered soil, fuel, concrete washouts,
building materials, and fertilizers. Reference the Erosion Control Plan in the Appendix for
the location of the staging area. The staging/stockpile area(s) may be moved to a location
no closer than 100’ from a stormwater conveyance.
2.7 Non-Stormwater Components of Discharge
Site disturbance will not exceed five feet below the existing grade, therefore having no
impact on the groundwater at lower depths.
2.8 Minimization of Directly Connected Impervious Areas
Directly connected impervious layers are surfaces which do not have infiltration
characteristics and do not flow into or through a pervious areas. The site specific
impervious layers include the asphalt parking and the concrete sidewalks. To mitigate
these DCIA’s, the asphalt drive aisle and concrete sidewalk has been designed to drain
through landscaped areas. The design has fully restricted DCIA’s allowing for all
impervious areas to, at some point, flow through Receiving Pervious Areas (RPA).
2.9 Receiving Waters
Runoff from the site will be directed to existing storm sewer inlets, by sheet and gutter
flows. Once the runoff enters the storm sewer system, it is directed to the Poudre River.
BMPs for Stormwater Pollution Prevention
3.1 Erosion and Sediment Controls
Once construction activity begins, Best Management Practices (BMP’s) intended to
contain sediment onsite must be constructed, inspected and repaired as necessary. Such
controls must be functional before upslope land disturbance takes place. The BMP’s will
be installed as shown on the enclosed Erosion Control Plans. They must be supplemented
as on-site experience proves necessary in order to control sediment, pollutant discharge,
and insure public safety. The following temporary and permanent BMP’s will be installed
and maintained to control on-site erosion and prevent sediment from traveling off-site
during construction:
Temporary BMP’s
Temporary Seeding is the establishment of a temporary vegetative cover on a graded
area that will be exposed for longer 30 days. Temporary seeding can be used on areas
requiring temporary protection that will eventually need permanent vegetation at the
completion of the construction or it can be used for areas that will be re-disturbed after
a period of inactivity.
Vehicle Tracking Control (shown as VTC on the Erosion Control Plan) is a stabilized
stone pad located at points of ingress and egress on a construction site and acts as a
temporary BMP. The stone pad is designed to reduce the amount of mud transported
onto public roads by construction traffic by removing mud and sediment from the
vehicle’s wheels when it drives over the gravel pad. These areas are limited to the
minimum number necessary to provide functional construction access and installed
prior to overlot grading activities. Whenever the construction entrance exists onto a
public road, the road shall be cleaned at the end of each day.
Silt Fence (shown as SF on the Erosion Control Plan) is a temporary BMP that is
typically used as filter structures in areas of sheet water flow such as landscape slopes.
A silt fence is a geotextile fabric attached to wooden posts and trenched into the ground.
A silt fence can be used where runoff is conveyed from a disturbed area as sheet flow.
Silt fence is not designed to receive concentrated flow or to be used as a filter fabric.
Typical uses include: down slope of a disturbed area to accept sheet flow, along the
perimeter of a receiving water such as a stream, pond or wetland, and at the perimeter
of a construction site.
Concrete Washout Area (shown as CWA on the Erosion Control Plan) is a designated
area designed to receive wash water from washing of tools and concrete mixer chutes,
liquid concrete waste from dump trucks, mobile batch mixers, or pump trucks, that acts
as a temporary BMP. Concrete washout areas must be designated on all sites that will
generate concrete wash water or liquid concrete waste from onsite concrete mixing or
concrete delivery. Concrete washout activities must be conducted in a manner that
does not contribute pollutants to surface waters or stormwater runoff. Concrete
washout areas may be lined or unlined excavated pits in the ground, commercially
manufactured prefabricated washout containers, or aboveground holding areas
constructed of berms, sandbags, or straw bales with a plastic liner.
Rock Sock (shown as RS on the Erosion Control Plan) is a temporary BMP that is
constructed of gravel that has been wrapped by wire mesh or geotextile to form an
elongated cylindrical filter. Rock socks are typically used either as a perimeter control
or as part of inlet protection. When placed at angles in the curb line, rock socks are
typically referred to as curb socks. Rock socks are intended to trap sediment from
stormwater runoff that flows onto roadways as a result of construction activities. Rock
socks can be used at the perimeter of a disturbed area or along small concentrated flow
paths to control localized sediment loading. Cones should be placed near Rock Socks
in heavy traffic areas to minimize damage from vehicles.
Wind Borne Sediment and Dust Control measures will be provided during the
construction process to control wind borne sediment. During grading activities, water
will be applied to the disturbed soils for the purpose of maintaining cohesion with clay
type soils and also to meet moisture requirements for compaction of disturbed soils.
Other measures of mitigation for wind erosion may include the timely installation of
seed and mulch following the establishment of final grade, and the timely installation
of pavement following completion of utility trenching operations and curb
construction.
Permanent BMP’s
Permanent Seeding and Planting is the establishment of a permanent perennial
vegetation such as trees, shrubs, vines, grasses/sod, or legumes on exposed areas for
final permanent stabilization in order to provide stabilization of the soil by holding soil
particles in place. It also reduces stormwater runoff velocity, maintains sheet flow,
protects the soil surface from erosion, promotes infiltration of runoff, and improves
wildlife habitat. The landscape plans for the site show the permanent seeding and
plantings.
Preservation of Existing Vegetation should occur where no construction activity is
expected to occur. Preservation of natural vegetation is generally a permanent BMP
and is applicable to construction sites with pre-existing vegetation. Only land needed
for building activities and vehicle traffic needs to be cleared. For this site, the existing
trees will be preserved, while the rest of the existing vegetation will be removed.
Rain Garden is a permanent Low Impact Development (LID) BMP that utilizes
multiple treatment processes to remove pollutants, including sedimentation, filtering,
adsorption, evapotranspiration and biological uptake of constituents. It also can act as
both the WQCV as well as the 100-Year detention volume, economizing the site. The
rain garden is shown on the landscape plans for the site.
Permeable Pavement (Pavers) is a permanent Low Impact Development (LID) BMP
that provides water quality treatment in an area that serves more than one purpose.
They are typically located downstream from impervious areas and are designed to
capture flow from those impervious areas, while acting as a suitable working surface.
3.2 Erosion Control Sequencing
The following is the proposed erosion control sequencing:
Prior to Construction
Preserve Existing Vegetation – Before construction commencement, areas that are not
disturbed by construction activity should be preserved as needed with construction fencing,
silt fencing, or other means to keep vehicular traffic out of the area to be left undisturbed.
For this site, the existing trees and bushes will be preserved as noted on the engineering
and landscape plans.
Inlet/Gutter Protection/Rock Socks – Rock socks will be placed at curb inlets and gutters
located adjacent to the site immediately prior to earth disturbing activities, if applicable.
Silt Fence – Before earth disturbing activities, silt fence will be placed downstream of areas
where runoff from construction activities are expected to occur. In particular for this site,
silt fence will be place downstream of the proposed stockpile area (if applicable). Silt fence
will be placed near the curb on the east side of the site.
Vehicle Tracking Control – Before construction commencement but after a portion of
asphalt demolition, vehicle tracking control shall be placed at points of ingress and egress.
It should also be placed at the stockpile area exits (if applicable).
During Construction
Wind Borne Sediment and Dust Control – Wind borne sediment and dust control measures
should be implemented during grading activities.
Slope Protection – Surface roughening, and contour furrows shall occur after rough
grading. For this site, the majority of steeper slopes that may require surface roughening
are shown on the grading and erosion control plans.
Permanent Seeding – Permanent seeding or landscaping shall be placed immediately in
areas that are final graded and where little future disturbance is expected. In particular,
permanent seeding should be included in the landscaped areas, and other areas that are not
to be disturbed as part of construction.
Temporary Seeding – The majority of the landscaped areas will be permanently
seeded/planted. However, if the roadways/parking lots do not have base course placed on
them or the lots are left disturbed without permanent stabilization 30 days after grading,
temporary seeding will be required.
Post Construction
Refer to Final Stabilization and Long-term Stormwater Quality below.
3.3 Materials Handling and Spill Prevention
The site development will include the appropriate construction staging areas. Stormwater
runoff generated from the staging areas will be routed to a temporary sedimentation area
where runoff will be contained and filtered before being discharged off site. Reference the
Erosion Control Plan in the Appendix for the location of the staging area (as applicable).
The staging/stockpile area(s) may be moved to a location no closer than 100’ from a
stormwater conveyance. Vehicle tracking control should be placed at the stockpile area
entrance/exit and silt fence should surround it. If the stockpile/staging area(s) is moved, the
SWMP should be updated.
Chemicals, fuels, lubricants, and paints typical with building construction stored on-site
will be in water tight containers and covered as necessary and stored in a bermed area, a
storage building, or within a vehicle to act as secondary containment. Storage of onsite
materials including building materials, fertilizers, waterline, sanitary sewer, and storm
sewer will be covered and placed on pallets to prevent direct contact with the ground and
potential surface runoff.
Other hazardous waste disposal (that is not typical to commercial building construction) is
not included within this SWMP. OSHA standards shall be followed. Concrete and asphalt
batch plants are not anticipated on this site and thus are not included in this SWMP
In the event of a spill or accident, it shall be contained and disposed of so that it will not
flow from the site or soak into the soil. Once construction is completed, concrete waste and
contaminated soil will be disposed of properly. The SWMP Administrator should be
notified of spills.
Other Controls
Solid waste materials, including disposable materials incidental to the major construction
activities, will be collected in containers. The containers will be emptied periodically and trucked
away from the site.
Water used to establish and maintain grass, for dust control, and for other purposes during the
construction phase must originate from a public water supply or private well approved by the
Colorado Department of Public Health and Environment unless otherwise approved.
Sanitary facilities shall be provided at the site throughout construction activities. They shall be
utilized by construction personnel and serviced regularly by a commercial operator. Locate toilet
facilities approximately 50 ft. away from storm drain inlets and waterways to prevent accidental
spills and contamination of stormwater. Provide tie-downs or stake-downs for portable toilets.
Loading and Unloading Operations: Steps should be taken to minimize the movement of soil
from the site. Contractors and laborers shall park along the street near the site as opposed to on
the lot itself to prevent unwanted tracking of soil from the site. When loading/unloading equipment
from vehicles, load/unload at the driveway or along the street near the site, to minimize the
movement of soil from the site.
Vehicle and Equipment Maintenance and Fueling: All vehicles and equipment will be fuelled
offsite, before arriving to the site. Maintenance and repair of vehicles and equipment will also
occur offsite.
Waste Management and Contaminated Soils Removal: All contaminated soils must be
removed from the site to prevent on-site disposal of solid waste. Provide storage in accordance
with Spill Protection, Control and Countermeasures (SPCC) requirements and plans and provide
cover and impermeable perimeter control, as necessary, for hazardous materials and contaminated
soils that must be stored on site. When construction is complete, debris, unused stockpiles and
materials should be recycled or properly disposed. In some cases, this will require disposal of
contaminated soil from equipment leaks in an appropriate landfill.
Locate waste-collection areas away from streets, gutters, watercourses, and storm drains. Waste-
collection areas (dumpsters and such) are often best located near construction site entrances to
minimize traffic on disturbed soils. Consider secondary containment around waste collection areas
to minimize the likelihood of contaminated discharges. Construction-related materials, debris and
waste must be removed from the construction site once construction is complete. Designate trash
and bulk waste-collection areas on-site.
Dedicated Concrete and Asphalt Batch Plants: There will not likely be any dedicated asphalt
or concrete batch plants on-site.
Final Stabilization and Long-term Stormwater Quality
Final stabilization is reached when all soil disturbing activities at the site have been completed and
vegetative cover has been established with a density of at least 70 percent of pre-disturbance levels
or when equivalent permanent erosion reduction methods have been utilized. Final stabilization
shall be performed in accordance with the City of Fort Collins Stormwater Standards Manual.
Upon final stabilization, temporary BMP’s may be removed, unless they are required to remain in
place for future phasing.
Inspection and Maintenance Procedures
The temporary BMP’s will be inspected and documented at a minimum of once every 14 days and
within 24 hours after each precipitation or snowmelt event. The SWMP will be kept up-to-date
with inspection records, maintenance procedures, and changes. Records should include complete
inspection reports for each inspection, maintenance and repair reports as a result of the inspections,
and records of maintenance as indicated in the City of Fort Collins Stormwater Standards Manual,
manufacturer’s specifications, or other acceptable sources. A record-keeping system is
recommended in managing inspection and maintenance reports and should include all maintenance
records, spill response, weather conditions, training, correspondence, etc.
Preventative maintenance also involves the regular inspection and testing of equipment, timely
maintenance of the equipment, and complete records of the maintenance and inspections of the
equipment. The maintenance and inspection records should be kept on site and made available
upon request.
Inspections must include the observation of the construction site perimeter, runoff discharge
points, disturbed areas, staging areas (including concrete washout areas and fueling areas), erosion
and sediment control measures identified in this SWMP, and any other structural BMP’s that may
require maintenance. The inspection must determine if there is evidence of or potential for
pollutants to enter the drainage system and if they should be modified, replaced, or added to.
The following includes some maintenance procedures:
Erosion and sediment control measures determined, upon inspection, to be in need of
repair shall be maintained as soon as possible on items or areas identified in the
inspection report. Most repairs should be completed within 24 to 48 hours.
Locations where vehicles enter or exit the site shall be inspected for evidence of
sediment being tracked off-site by construction traffic. Such sediment shall be removed
before it can be conveyed to the receiving storm drains or creeks.
Rock at inlet protection will be checked regularly for sediment buildup which will
prevent drainage. If the rock is clogged with silt, it will be removed and cleaned or
replaced.
Seeded areas will be checked to see that grass coverage is maintained. Areas will be
watered, fertilized and reseeded as needed.
It is the responsibility of the Operator to maintain effective pollutant discharge controls.
Actual physical site conditions or contractor practices could make it necessary to install
more control than are shown on the Erosion Control Plan. For example, localized
concentrations of surface runoff or unusually steep areas could require additional
erosion control devices. Assessing the need for, and implementing additional controls
will be a continuing aspect of the SWMP until final stabilization. This plan intends to
control water-borne and liquid pollutant discharges by some combination of
interception, filtration, and containment. Parties implementing this plan must remain
alert to the need to periodically refine and update the plan in order to accomplish the
intended goals.
Sediment that has escaped the construction site must be removed at a frequency
sufficient to minimize off-site impacts.
References
“City of Fort Collins Stormwater Criteria Manual”, City of Fort Collins, Adopted December
2011
Natural Resources Conservation Service Web Soil Survey at websoilsurvey.nrcs.usda.gov/app
Urban Storm Drainage Criteria Manual, Volumes 1, 2, and 3, Urban Drainage and Flood Control
District, April 2008
APPENDIX A
Erosion Control Plan
Erosion Control Details
FS FS FS FS FS
WOOD DECK
WOOD PORCH
0.5' WIDE
BRICK WALL
10" DIAMETER
COLUMN (TYP)
0.5' WIDE
CONCRETE WALL
DRAIN CHASE
DRAIN CHASE
DRAIN CHASE
DRAIN CHASE
CONCRETE RAMP
-CONCRETE-
-CONCRETE-
-CONCRETE-
-CONCRETE-
-CONCRETE-
CONCRETE PAN
-GRASS-
-GRASS-
-GRASS-
-GRAVEL-
-GRAVEL-
-GRASS-
-GRASS-
-GRAVEL-
SMH #1
RIM=5002.2
8" RCP (S) INV=4996.6
8" RCP (N) INV=4996.5
SS SS SS SS SS SS SS SS SS SS SS SS
LID=5002.5
CONCRETE
COURTYARD
CONCRETE STAIRS
2 STORY
RESIDENTIAL
FRAME
NO BASEMENT
2 STORY
RESIDENTIAL
FRAME & BRICK
WITH BASEMENT
SOUTH SHERWOOD STREET
PARCEL 1
9,500 SQ.FT.
0.218 ACRES
PARCEL 2
9,500 SQ.FT.
0.218 ACRES
WOOD SHED
LID=5000.8
BLOCK 73
ALLEY
GATE
(UP)
(UP)
(UP)
C6.2
FOR BURIED UTILITY INFORMATION
THREE (3) BUSINESS DAYS
BEFORE YOU DIG
CALL 811
(OR 1-800-922-1987)
UTILITY NOTIFICATION
CENTER OF COLORADO (UNCC)
WWW.UNCC.ORG
R
FAITH FAMILY
317-321 SHERWOOD STREET
FORT COLLINS, CO 80521
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL
CITY OF FORT COLLINS, COLORADO
UTILITY PLAN APPROVAL
(UP)
EG
EG
EG
EG EG
EG
EG EG
EG
EG
EG
EG
EG EG
EG EG
EG
EG
EG
EG
W W W W W W W W W W W W W
VERTICAL CURB
& GUTTER (TYP)
WS WS WS WS WS WS WS
WS WS WS WS WS WS WS
FS FS
FS FS
FS FS FS
2-3/4" COPPER SERVICE
2" COPPER FIRE SERVICE
3
4" COPPER SERVICE
6" SANITARY SEWER 8" SANITARY SEWER
EG
SIGN "2 HOUR PARKING"
4" CAST IRON WATER LINE
325 SHERWOOD STREET
512 WEST MAGNOLIA STREET
EXISTING 5' SW
ALLEY HIGH POINT
PROPOSED
ROLL-OVER CURB
PROPOSED
OUTFLOW CURB
C4.0
10'
SCALE: 1" = 10'
0 20'
FAITH FAMILY
317-321 SHERWOOD STREET
FORT COLLINS, CO 80521
FOR BURIED UTILITY INFORMATION
THREE (3) BUSINESS DAYS
BEFORE YOU DIG
CALL 811
(OR 1-800-922-1987)
UTILITY NOTIFICATION
CENTER OF COLORADO (UNCC)
WWW.UNCC.ORG
R
D2