HomeMy WebLinkAboutSWPPP OutlineSWPPP Outline
Storm Water Pollution Prevention Plan (SWPPP) for construction projects are established and
enforced to protect the quality of the receiving waters, prevent local flooding, reduce storm
water facilities maintenance projects, and prevent potential hazardous surface conditions. An
SWPPP comprises of a description and the implementation of Best Management Practices
(BMPs) over the course of a construction project to limit/eliminate sediment discharge. The
SWPPP is a living document subject to evolve parallel to the progression of the project’s
construction activity.
The City of Iowa City (City) requires a SWPPP for review, to be submitted by a certified design
professional, for construction projects disturbing an acre or greater. Each SWPPP is evaluated,
verifying all requirements of the Iowa DNR’s NPDES General Permit #2 have been addressed by
the City’s Engineering Department. To facilitate the public with the SWPPP composition, the
City has provided the following outline: (For additional clarification and exemplification, the
Iowa DNR’s NPDES General Permit #2 and Iowa City Code of Ordinance Title 17 have been
referenced.)
1) City Requirements – (Ch 8, Title 17-8-15, A, (4) of the Iowa City Code)
a) Copy of Applicants Notice of Intent (NOI)
b) Copy of the permittee’s NPDES General Permit No.2
2) Contact Information –
a) Title Holder;
b) Contractor(s);
c) SWPPP Designer information; and
d) Twenty-four hour contact.
3) Site Description – (NPDES GP2 Part IV.D.1.A-C.) Provide a description of:
a) Proposed construction activity;
b) Estimate total site/lot area;
c) Estimate total projected land disturbance to occur during construction activity;
d) Estimate of projected green space;
e) Soil description;
f) List of receiving waters;
g) Evaluation of potential source of pollution.
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4) Site Plan/Map – (NPDES GP2 Part IV.D.1.D.) An Erosion Control Plan shall display: a)
Anticipated contours;
b) Placement of erosion and sediment control practices;
i. Stabilization Practices (NPDES GP2 Part IV.D.2. A.(1).) ii.
Structural Practices (NPDES GP2 Part IV.D.2.A. (2).(a-c.)) iii.
Construction entrance iv. Concrete washout
v. Stockpiles
vi. Fueling area
vii. Staging area
viii. Portable restroom facility(s)
ix. SWPPP Box
x. Contractor Trailers
xi. Etc.
c) Drainage patterns;
d) Locations of current and projected drainage ways;
e) Locations of current and projected surface water;
f) Sensitive and/or protected areas;
g) Location where storm water will be discharge from the site; and
h) Current and projected vegetated areas.
5) Drainage Plan – (Accompanied by a Drainage Report) – (NPDES GP2 Part IV.D.1.C.)
a) Provide existing runoff data for the site ; and
b) Estimate post-construction runoff coefficient.
5) Erosion and Sediment Control Practices – (NPDES GP2 Part IV.D.2.A-B.)
a) Description and specifications of control devices, structures, and practices that
will be utilized on site to contain or prevent sediment runoff;
b) Sequence of events regarding construction activity and its association with the
implementation of erosion and sediment controls/practices on site;
c) Description of the implementation of the topsoil preservation requirement; and
d) (Additional BMP requirements listed in D 2. A. of the IDNR’s NPDES General
Permit #2 may apply).
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6) Maintenance – Description of standard procedures for maintaining onsite sediment
and erosion control devices, structures, and practices. (NPDES GP2 Part IV.D.3.)
7) Good Housekeeping – (NPDES GP2 Part IV.D.2.C.) Describe procedures for:
a) Waste disposal;
b) Proper staging areas and practices;
c) Concrete washout procedures;
d) Spill prevention and containment plan;
e) Proper secondary confinement/vehicle fueling and maintenance practices;
f) Vehicle tracking sediment off site practices;
g) Sanitary waste disposal management;
h) List and define control method(s) for allowable onsite non-storm water
discharges (See NPDES GP2 Part III.A.2 for authorized non-storm water
discharges); and
i) List and define additional BMPs regarding Good housekeeping practices.
8) Post-Storm Water Management Features/Practices – (NPDES GP2 Part IV.D.5.)
a) Description of post-construction measures (BMPs) to be constructed during the
construction process to handle storm water discharges post-construction
(volume & flow rate);
b) Description of post-construction measures (BMPs) to be constructed during the
construction process to treat storm water discharges post-construction.
(Hydrocarbon treatment, etc.); and
c) Procedures for final inspection of inaccessible/confined-space structures prior to
Final CO approval.
The City of Iowa City requires underground detention facility’s model number and a
copy of its maintenance manual be submitted with the project’s SWPPP.
9) Inspections – (NPDES GP 2 Part IV.D.4)
a) Identify personnel to perform inspections and list their qualifications;
b) Provide a detailed description of standard inspection procedures, documentation
practices, inspection frequencies for individual (hotspots, i.e. oil/grease
separators) BMP and/or a group of them;
c) Provide an inspection form template;
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d) Procedures for documenting and informing the appropriate personnel to
implement corrective actions;
e) SWPPP plan revision and updating procedures;
f) Description of proper logging procedures of site activity; and
g) Weekly SWPPP report contents.
10) Record Keeping – Description of where the Notice of Intent (NOI), (NPDES GP 2 Part
V), and the required contents to attain the NOI, the SWPPP documents, and weekly
inspection reports are to be located on site.
11) Certifications and Notifications – The owner, contractor(s) and/or
subcontractor(s) who are responsible for the permit requirements, the implementation
of erosion and sediment control practices, execution of land disturbance activity, and/or
generating onsite runoff activity shall identify each measure they are to be responsible
for implementing on a signed certification statement. (NPDES GP 2 Part IV.7.)
12) Additional Permits and Regulations – If the area of disturbance is subject to
additional statutes and regulations, provide information regarding these requirements
and responsibilities. These can include, but are not limited to, Historical Preservation,
Endangered Species, Environmental Law, etc.
The permit applicant is responsible for addressing all of the Iowa DNR’s General Permit #2
regulations within the SWPPP, regardless of whether it is specified in the outline. Any
misrepresentation or circumventing will be in violation of the City’s Ordinance and subject to
fines and penalties.
Special Conditions for Stormwater Prevention Plan
The following design criteria and special conditions are mandated by the City of Iowa City to
maximize the efficiency of stabilization and runoff containment methods, which correlates with
the City’s National Pollution Elimination System MS4 requirements and Title 17 of the Iowa
City’s Code of Ordinance.
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It is the Applicant’s, Owner’s, and Contractor’s responsibility to comply, validate, and enforce
the following requirements:
A) SWPPP REQUIREMENTS
1) An updated SWPPP and site plan documenting the construction progress, and the
implementation of scheduled and unscheduled sediment & erosion measures on site
shall be made available for all regulatory inspections.
2) Weekly SWPPP reports and signed copies of the Contractor Certification Statement
obtained by each of the contractors and sub-contractors implementing identified
measures stated in the SWPPP shall be made available for all regulatory inspections.
3) The SWPPP Plan shall be amended when construction activity, operations, or
maintenance has a substantial effect on sediment discharge from the site which was
not addressed in the original plan, or if the original plan proved to be ineffective.
4) The Applicant shall inform the Stormwater Specialist within seven calendar days of
any site contact information update, or the transference of the NPDES General
Permit #2. (For residential lots located in a larger common plan of development
where the owner has the buyer sign an agreement stating sole responsibility. The
Buyer is required to produce a SWPPP and obtain a NPDES General Permit No.2 prior
to land disturbance.)
5) The Applicant shall comply with all other applicable state and federal permit
requirements.
B) Scheduling
1) Land disturbance activity shall not take place on site until it is essential for
construction to initiate, at which time sediment and erosion controls shall be
implemented preceding any activity other than grubbing and clearing along the
site’s perimeter.
2) Phase construction shall be implemented on sites where feasible. The contractor has
the responsibility to limit the exposure time of a disturbed area prior to its
development.
3) The contractor(s) is responsible for integrating the implementation of the SWPPP’s
erosion and sediment practices with the construction schedule during site
development, as well as, additional measures warranted by site conditions.
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C) Monitoring
1) Inspections:
a) Designated site SWPPP inspector shall inspect the erosion and sediment control
practices once every seven calendar days.
b) A report documenting at minimum the seven day inspection, which shall
incorporate the status of the site’s BMPs, a description of current deficiency(ies),
their location, and corrective action(s) implementation schedule.
c) Applicant has three days to implement corrective actions, unless additional
measures are required, at which time they will have seven days to modify the
SWPPP and implement BMPs. If Applicant detects sediment leaving the site, they
shall immediately implement proper sediment and erosion practices.
d) Unless otherwise approved by the city, construction shall not occur on the site at
any time when the city has identified conditions of noncompliance.
e) Unless approved by the city, construction activities undertaken by an applicant
prior to resolution of all discrepancies specified in the written report shall
constitute a violation.
Site Activity Specific Requirements
D) Erosion and Sediment Controls - Refer to Cedar Rapids Metropolitan Area Standard
Specifications for Public Improvements for proper controls and practices/construction
procedures.
1) Structural Controls:
a) Sediment Basin Requirements;
i) Refer to IDNR’s NPDES General Permit #2 (Part IV.D.2.A.(2).(c). to determine
if a temporary or permanent sediment basin is required.
ii) Construction of the structure shall commence prior to or during initial site
work, and made functional prior to upslope land disturbance activity.
iii) When feasible, the use of outlet devices that withdraw water from the
surface of the detained body of water shall be utilized.
iv) Stabilization of the basin’s slopes shall be implemented immediately after it
is constructed.
v) Maintenance shall be performed once sedimentation has compromised the
structure’s holding capacity by 50%.
vi) Dewatering filtering practices for sediment traps and basins shall be utilized
to obtain a 300 or less NTU (Nephelometric Turbidity Units) prior to
discharging offsite or into the City’s MS4 system.
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b) Inlet Protection;
i) Protection devices shall be installed around existing onsite inlets prior to
land disturbance activity.
ii) Inlet protection devices shall be installed around projected inlets once
connected to an existing storm sewer system or once the storm system
becomes operational.
iii) Routine inspections shall be performed prior to and following rain events
and once every seven days.
iv) Inlet protection displaying sediment accumulation and/or are damaged
shall be maintained or replaced immediately.
c) Sediment Controls;
i) Perimeter controls and diversion control practices shall be implemented
prior to the commencement of land disturbance activities.
ii) Perimeter control application shall be scheduled and implemented
immediately following the completion of clearing and grubbing activity.
iii) Control measures shall be maintained to their original condition once
sediment accumulation has succeeded ½ of the control’s holding capacity or
has sustained damage rendering it nonfunctional.
iv) Erosion and sediment control practices shall be implemented in accordance
with the sequence of construction as called out in the SWPPP plan.
v) All temporary sediment controls shall be removed within 30 days of
achieving final stabilization as called out in the IDNR’s NPDES General
Permit #2.
d) Erosion Controls;
i) Stabilization measures shall be implemented through drainage ways and on
stream/river banks immediately following their completion.
ii) Stockpiles and disturbed areas that will be inactive for 14 days or more shall
be seeded and mulched immediately upon dormancy.
iii) Erosion controls to divert uphill runoff shall be implemented and stabilized
prior to any land disturbance activity. (i.e. earth berms, dikes, drainage
ways, temporary slope drains, mulch berms, etc.)
E) Stabilized Entrance Drives
1) For construction specs refer to SUDUS Standard Specifications
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2) Stabilized construction entrance drives shall be inspected and maintained daily to
prevent tracking or the flow of sediment offsite.
3) No material shall be swept or rinsed into the storm sewer system. Any sediment
tracked offsite shall be immediately cleaned up utilizing proper equipment and
removal procedures, and corrective actions addressing the origin of the issue shall
be implemented prior to continuing the instigating activity.
F) Concrete, Grout, and Mortar Waste Management
1) Concrete Management
a) Material Management – Contractor shall store concrete grout, and mortar away
from drainage areas and ensure that these materials do not enter the storm
drain system; cove and protect from rainfall and to prevent run-off.
b) No personnel shall allow concrete washout procedures to transpire onsite other
than in a designated confined area.
c) A designated washout facility shall be installed/constructed onsite prior to any
foundation or flatwork, located on level ground accessible from a hard surface,
and properly maintained once its holding capacity is ¾ full or has sustained
damage rendering it nonfunctional.
2) Paving Operations and Saw Cutting Activities
a) Project Site Management - All nearby catch basins shall be cover or barricade
using control measures, such as filter fabric, straw waddles, and sand bags, as
necessary to keep paving material or cutting slurry out of the storm drain
system.
b) Waste Management – Contractor shall not sweep or wash down excess materials
or new surfaces into gutter, storm drains, or creeks.
3) Grout and Mortar Waste Management
a) Onsite stationary mixers shall not be located near drainage ways, existing storm
inlets, basins, etc.
b) Sediment controls shall be placed on the downhill side of the facilities to contain
runoff.
c) Loose aggregate shall be swept or scooped up and disposed of properly in a solid
waste container.
G) Painting
1) Project Site Management - All nearby catch basins shall be cover or barricade using
control measures, such as filter fabric, straw waddles, and sand bags, as necessary to
keep paving material or cutting slurry out of the storm drain system.
2) Oil-based Paint – All waste thinner and solvent, and sludge from cleaning of
equipment and tools shall be disposed as hazardous waste.
3) Waste Management-
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a. All paint, solvents, chemicals, and waste materials shall be stored in
compliance with the requirements of of the Owner and all applicable
Federal, State and County regulations. Contractors shall store these materials
in a designated area that will not allow run-on of storm water or runoff of
spills.
b. All dry, empty paint can/buckets, old brushes, rollers, rags and cloths shall
dispose of in the trash.
H) Hazardous and Non-Hazardous Waste Management
1) Hazardous Waste
a) All onsite hazardous material shall be stored and properly disposed of according
to the substance’s MSDS specifications. (For additional disposal assistance please
contact the Linn County Solid Waste Agency)
b) In case of spill contact the Johnson County - IA Region IX HazMat Team (319)
356-5260 for control assistance and/or spill response. For emergencies call 911.
c) Report any “Release of Excess of Reportable Quantities” within 6 hrs of the spill
to the county sheriff’s office. (IDNR’s NPDES General Permit #2 Part III.B.)
2) Non-Hazardous Waste Management – A high-level of sanitation shall be sustained
throughout the construction process.
a) Solid Waste
i Solid waste containers shall be located onsite within the designated
storage area(s). If additional containers are necessary elsewhere onsite
they shall be located on and accessible from a hard surface.
ii Solid waste containers shall be maintained prior to debris protruding
from the top of the unit.
iii All open top solid waste containers that are utilized onsite shall be
inspected for leaks immediately after rain events.
b) Granular Material – (i.e. any excavated or imported earth, and, aggregate base,
etc.)
i Granular material storage shall be at least ten feet away from catch
basins or curb returns, and kept cleat of gutter, swales, and drainage
channels. No stockpiling is allowed in the street.
ii When rain is forecasted within the next 24-hours and stored granular
material is a potential point source for an illicit discharge material must
be covered with tarpaulin or plastic sheeting and surrounded with
sandbags to prevent run-off.
c) Street Sweeping – At the end of the day or as directed by the City, all public
roadways and public-right-of-wat sidewalks shall be clean and sweep of all
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material attributed to site work. No water shall be utilized for any type of
cleaning practice.
I) Vehicle & Equipment Maintenance and Fueling
1) Vehicle & Equipment Maintenance
a) Onsite vehicles and equipment shall be inspected daily for leaks. If leaks are
detected proper cleanup procedures shall be implemented.
b) If vehicle or equipment maintenance is necessary on site proper preventive
measures/equipment shall be used. (Drip pan, spill kit, etc.)
c) Daily cleaning of vehicle or equipment shall be perform with water only, in a
designated, bermed area that will not allow waste water to flow offsite into
streets, gutters, storm drains, or creeks.
d) All vehicle or equipment fluid leaks and spills shall be cleaned up immediately
and disposed of waste and cleanup material as hazardous waste.
2) Fueling
a) A secondary confinement tank or barrier shall be installed/constructed around
each individual tank/barrel or fueling station.
b) All stationary onsite fuel tank/barrels shall have a designated area away from
swales, drainage ways, storm inlets, basins, etc. and accessible from a hard
surface.
c) Report any “Release of Excess of Reportable Quantities” within 6 hrs of the spill
to the county sheriff’s office. (IDNR’s NPDES General Permit #2 Part III.B.)