University of South Carolina
Storm Water Management Plan
Table of Contents
VIII
IX
X
XI
XII
Section
Introduction
Regulatory Summary
Permit History
Definitions
Discharges Authorized Under NPDES
Unauthorized Discharges
Elements of a Storm Water Management Plan (SWMP)
Element 1 – Structural Controls and Storm Water Collection System Operation
Element 2 – Post-Construction Storm Water Management in New Development
and Redevelopment
Element 3 – Existing Roadways
Element 4 – Flood Control Projects
Element 5 – Municipal Waste Treatment, Storage, or Disposal Facilities not
Covered by an NPDES Storm Water Permit
Element 6 – Pesticides, Herbicides, and Fertilizers (PHFs) Application
Element 7 – Illicit Discharge and Improper Disposal
Element 8 – Industrial Runoff
Element 9 – Construction Site Storm Water Runoff Control
Element 10 – Monitoring Program
Element 11 – Public Education and Outreach on Storm Water Impacts and Public
Involvement and Participation
Total Maximum Daily Loads (TDML) and Impaired Water Bodies
Congaree Watershed Management
City of Columbia Procedure for Construction Storm Water Runoff Control
USC’s Illicit Discharge Detection and Elimination Plan
Penalties for Violations of NPDES Permit Conditions
XIII
New 2013 Construction General Permit (CGP) for Storm Water Discharges
I
II
III
IV
V
VI
VII
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I. Introduction
The goal for having storm water regulations is so that human activities will have minimal or no
adverse impact on the environment. The University of South Carolina is committed to following
storm water regulations, not just on a project by project basis, but in a long-term, comprehensive,
and planned fashion.
USC’s mission for this Storm Water Management Plan is to provide a comprehensive development
tool for University personnel and the City of Columbia engineers. We realize that individual
development plans must be integrated as part of our total campus development. During planning,
each individual project must be evaluated to determine necessary controls to manage storm water
runoff in respect to other storm water controls and requirements on the campus and within the City
of Columbia.
II. Regulatory Summary
Storm water runoff often carries pollutants which reach the waterways through a variety of means.
In order to control the type and quantity of pollutants reaching streams and lakes, the federal
government has implemented the National Pollutant Discharge Elimination System (NDPES) for
storm water runoff from our Municipal Separate Storm water Sewer System (MS4).
As a part of the Clean Water Act, which was mandated by Congress, the NPDES Storm water
Program is a comprehensive two-phase national program for addressing the non-agricultural
sources of storm water discharges which adversely affect the quality of our nation’s waters. The
program requires the implementation of controls to prevent harmful pollutants from being washed
by storm water into local bodies of water.
Phase 1 was issued in 1990 and required medium and large cities and some counties with
populations of 100,000 or more to obtain NPDES permit coverage for their storm water discharges.
Phase II was issued in 1999 and requires regulated small MS4s in urbanized areas, as well as small
MS4s outside the urbanized areas that are designated by the permitting authority, to obtain NPDES
permit coverage for their storm water discharges.
In general, Phase I MS4s are covered by individual permits and Phase II MS4s are covered by a
general permit. Each regulated MS4 is required to develop and implement a storm water
management program (SWMP) to reduce the contamination of storm water runoff and to prohibit
illicit discharges.
III. Permit History
In South Carolina, the Department of Health and Environmental Control (SC DHEC) is the NPDES
Storm water Program implementing agency. The City of Columbia has been designated by SC DHEC
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as a Phase 1 MS4 and was issued NPDES Permit SCS790001 on January 8, 2010. This permit expires
on January 24, 2015.
As a large part of the City of Columbia, USC is also responsible for the MS4s that we own, operate,
and maintain within the City limits. The USC Storm Water Management Plan will focus on
requirements that are outlined under NPDES Permit SCS790001 and the City of Columbia’s Storm
Water Management Plan, as well as the Phase II NPDES Permit SCR030000 for Storm Water
Discharges from Regulated Small Municipal Separate Storm Sewer Systems.
IV. Definitions
BMP or Best Management Practices means activities, prohibitions of practices, maintenance
procedures, and other management practices to prevent or reduce pollution of waters of the United
States.
Discharge refers to discharges from the municipal separate storm sewer system (MS4).
Effective Prohibition means requirements to effectively prohibit non-storm water discharges into
the storm sewers.
Illicit discharge means any discharge to a municipal separate storm sewer that is not composed
entirely of storm water discharges in accordance with the NPDES permit.
Maximum Extent Practicable (MEP) is the technology-based standard for Municipal Separate Storm
Sewer Systems established by the Clean Water Act (CWA).
MEP is an acronym for “Maximum Extent Practicable,” the technology-based discharge standard for
municipal separate storm sewer systems established under the Clean Water Act.
Municipal Separate Storm Sewer System (MS4) means all municipal separate store sewers in and
around the University of South Carolina which are operated by the City of Columbia.
MS4 is an acronym for “municipal separate storm sewer system” and is used to refer to either large
or medium municipal separate storm sewer systems.
NPDES means the Federal Government’s National Pollutant Discharge Elimination System which was
developed to address the requirements of the Clean Water Act.
Riparian zones are the narrow strips of land that border creeks, rivers, or other bodies of water.
Because of their proximity to water, plant species and topography of riparian zones differ
considerably from those of adjacent uplands. Riparian areas represent an extremely important
component of the overall landscape.
Storm water means storm water runoff, snow melt runoff, surface runoff, and drainage.
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SWMP is an acronym for “Storm Water Management Program.”
Total Maximum Daily Load (TMDL) means a process to establish the allowable load of pollutants or
other quantifiable parameters for water bodies that do not meet designated uses under technologybased pollution controls.
V. Discharges Authorized Under NPDES
NPDES Permit SCR030000 was issued to the State of South Carolina for storm water discharges from
regulated small municipal SMS4s on April 2, 2011 and expires on April 1, 2016. This is a general
permit which further details authorized discharges to the storm water system.
1. Storm Water Discharges
USC is authorized to discharge storm water from SMS4s owned or operated by the City of Columbia.
Discharge of pollutants shall be prohibited to “maximum extent possible or MEP” standards of the
Clean Water Act and shall be in compliance with Total Maximum Daily Loads (TMDL) where
applicable.
2. Non-Storm Water Discharges
USC is currently authorized to discharge the following non-storm water sources to the SMS4 system:
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.
p.
q.
r.
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Water line flushing
Landscape irrigation
Diverted stream flows
Rising ground waters
Uncontaminated ground water infiltration (water other than waste water that enters a
sewer system, including foundation drains, defective pipes, pipe joint connections, or
manholes).
Uncontaminated pumped ground water
Discharges from potable water sources
Foundation drains
Air conditioning condensate
Irrigation water (not consisting of treated, or untreated, waste water)
Springs
Water from crawl space pumps
Footing drains
Lawn watering
Individual residential car washing
Natural flows from riparian habitats and wetlands
De-chlorinated swimming pool discharges
Street wash water
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s.
Discharges or flows from fire fighting activities.
VI. Unauthorized Discharges
The Clean Water Act requires SC DHEC to include within the NPDES permit, an effective prohibition
on non-storm water entering the MS4s. The following discharges are not authorized by this permit:
1. Non-storm water: Discharges of non-storm water, except where such discharges are
a.
In compliance with a separate NPDES permit, or
b
Identified by and in compliance with the City of Columbia Storm water Ordinance as
required by the permit.
2. Spills: Discharges of material resulting from a spill, except where such discharges are
a.
The result of an Act of God where reasonable and prudent measures have been taken to
minimize the impact of the discharge, or
b.
An emergency discharge required to prevent imminent threat to human health or prevent
severe property damage, provided that reasonable and prudent measures have been
taken to minimize the impact of discharge.
VII.
Elements of a Storm Water Management Plan (SWMP)
There are 11 program elements in NPDES Permits. The City of Columbia is required to complete the
storm water monitoring, controls, and management strategies contained in the NPDES permits. In
addition, the City must complete annual updates to SC DHEC with summaries on storm water
management activities. These NPDES elements are:
Element 1 – Structural Controls and Storm Water Collection System Operation
The City must operate its system in a manner that reduces the discharge of pollutants to achieve
“effective prohibition” and “Maximum Extent Practical” (MEP) standards from Section 402(p)(3)(B)
of the Clean Water Act.
This requires the City to prepare an inventory of structural controls and develop an inspection and
maintenance schedule. Authority to inspect, maintain, and repair structures located on private
property is also required. A Best Management Practices Manual will be developed to create
standardized design, construction, and maintenance of controls.
Structural controls are those structures built to modify or control the quality of storm water runoff,
volume of runoff, or the rate of flow. Structural controls are not items built primarily for the
purpose of conveyance, e.g. pipes and ditches.
The city must receive appropriate easements for newly constructed structural controls. Existing
structural controls will be reviewed to determine if appropriate easements are in place. The City will
also inspect structural controls to determine if the controls are being operated and maintained as
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designed. If the system is privately owned, such as USC’s property, and deficiencies are noted, a
corrective action will be sent to the owner. Enforcement personnel from the City’s Storm water
Section will provide follow up with the owner to ensure that appropriate corrective measures are
taken.
The City may request from private owners, a modification of maintenance items and schedule to
address issues that impact quality, peak flow, or volume of water leaving the control. If the owner
fails to comply with the request, the city will take appropriate action to ensure proper operation and
maintenance occurs.
Element 2 – Post-Construction Storm Water Management in New Development and
Redevelopment
The goal of the post-construction element is to protect receiving waters from the discharge of
pollutants, after construction is completed, by reducing pollutants to the MEP, to protect water
quality and to satisfy the appropriate water quality requirements of the Clean Water Act. New
development and significant redevelopment projects that disturb greater than one acre are subject
to this element. Projects that are less than one acre, but that are part of a larger common plan, are
also subject to this Element.
The program has been developed with an emphasis on watershed master planning, protecting
wetlands, riparian areas, natural areas, stream corridors, and other critical water quality resource
areas.
The City will create a set of design standards and Best Management Practices that address water
quality issues. Design and construction drawings for new development and significant
redevelopment must be submitted to the City for review and approval. Plans will be reviewed for
adherence to storm water quantity, quality management, sediment control, and design standards.
Deficiencies in design and drawings will be noted and revisions required prior to plan approval.
When plans have received approval for construction, a City inspector will be assigned to the project
and inspections will be scheduled. The project owner, contractor, and engineer will be notified in
writing of the inspection results and of any corrective items that must be addressed. A follow up
inspection will be conducted to ensure corrective measures have been taken. Enforcement will be
taken, if necessary. (For more information on Construction Runoff Control, see Section X of this
Storm Water Management Plan.)
Element 3 – Existing Roadways
The existing roadway element addresses runoff from roadway maintenance, construction, and
encroachments. The majority of roads within City limits are owned, operated, and maintained by
the SC Department of Transportation (SC DOT). SC DHEC has issued a separate NPDES Storm water
Phase 1 permit to SC DOT since they are responsible for most of these roadways.
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If USC is involved with any road construction or road encroachment projects, water quality must be
considered within roadway right-of-ways. Spill prevention, material management practices, and
good housekeeping must be maintained.
Element 4 – Flood Control Projects
When storm water conveyance upgrades and other improvements to the storm sewer system are
planned, USC must include an assessment of water quality impacts. Best Management Practices
design standards must be adhered to when implementing the project to ensure minimization of
pollutants during and after the project construction.
SC DHEC has a 303(d) List of Impaired Waters and Total Maximum Daily Loads Program. In
watersheds that contain a stream listed on the 303(d) list, or that has an established Total Maximum
Daily Load (TMDL), the project plan must specifically address the pollutant of concern. It is the
responsibility of the designer to identify the impaired water, the pollutant of concern, the proximity
of the planned project to the impaired water, and measures to address the pollutant during and
after project construction.
Rocky Branch Creek flows through USC properties, and portions of USC can be prone to flooding
during periods when heavy rains increase the water flows to Rocky Branch Creek. USC faculty, staff,
and students must be aware of the dangers of flooding in low areas near Rocky Branch Creek.
Element 5 – Municipal Waste Treatment, Storage, or Disposal Facilities not Covered by an
NPDES Storm Water Permit
USC does not operate a waste treatment, storage, or disposal facility. Our focus for this element is
on good housekeeping practices throughout our operations. We are also aware that some of our
operations deal with products such as chemicals and Bio-hazard waste which require special
handling and oversight.
The USC Motor Pool, located at 703 Pendleton Street, has 3 fuel tanks containing diesel fuel,
gasoline, and 85% ethanol for refueling vehicles. USC has a no-exposure certification for the Motor
Pool area (No Exposure Certification Number: SCRNE0191). EH&S personnel are investigating
methods for better protecting the MS4 in this area from the possibility of fuel spills.
USC also has written work instructions and program manuals for our hazardous waste, universal
waste, used oil, and infectious waste programs to ensure that these regulated materials are
prohibited from areas around the MS4s.
Element 6 – Pesticides, Herbicides, and Fertilizers (PHFs) Application
Clemson University, Department of Pesticide Regulation provides training and licensing of
commercial and non-commercial applicators of pesticides and herbicides. The goal of this element
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is to educate the general public on the proper storage, use, and disposal of pesticides, herbicides,
and fertilizers.
In this respect, the University of South Carolina is working to license at least one person on each
USC campus which applies any pesticide or herbicide. Other personnel may apply pesticides or
herbicides under the licensed individual as long as the licensee is within 30 minutes of the
application site.
Element 7 – Illicit Discharge and Improper Disposal
Direct discharge of pollutants into the storm drainage system can have a significant impact on water
quality in the receiving stream. The City of Columbia has been charged to provide the following
oversight:
1.
2.
3.
4.
5.
6.
Inspection, Ordinances, and Enforcement measures,
Provide Dry Weather Screening Program,
Investigate and eliminate suspected illicit and improper disposal,
Provide spill prevention and response,
Provide oils, toxics, and household hazardous waste control, and
Detect and eliminate sanitary sewage and septic seepage in the MS4 systems.
Element 8 – Industrial Runoff
This element requires the City to address, develop, and implement a program to monitor and
control pollutants. It will target privately and publically owned facilities that treat, store, dispose of,
or recover hazardous materials or materials that have the potential to contribute substantial
pollutant loadings to the MS4 systems. The City is charged with the following responsibilities:
1
2
3
Identify priorities and procedures for inspections of targeted facilities;
Develop a plan to inventory facilities, inspect all sites, inventory type and volume of pollutants,
schedule a frequency for follow-up inspections, and educate and inform industry of appropriate
storm water and pollution controls.
Review storm water Pollution Prevention Plans for Industries.
Element 9 – Construction Site Storm Water Runoff Control
The intent of the Construction Site Storm Water Runoff Control element is to reduce the quantity of
pollutants leaving active construction sites through effective design standards, plan review, and site
inspection measures. Specific activities will involve:
1
2
Developing a design manual to be utilized by plan preparers and designers for submitting plans
for review.
Ensure plan reviewers are qualified professionals as defined by SC DHEC.
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Develop and implement procedures for site plan review for all sites that disturb 1 acre or more.
Additionally identify potential water quality impacts for the discharge of pollutants of concern to
TMDL waters and to waters on the SC 303(d) List of Impaired Waters.
Develop an ordinance or other regulatory mechanism to require erosion and sediment controls
and to enforce compliance.
Require construction site operators to control waste such as discarded building materials,
concrete truck washouts, chemicals, etc.
The City of Columbia has review authority over all construction land-disturbance activities in the
City. USC project engineers must have plans reviewed through the City Development Services. The
City of Columbia has developed a land Disturbance Checklist that provides details on submittals to
the City’s storm water review authority. For further information, see Section X of this Storm Water
Management Plan.
Element 10 – Monitoring Program
Watersheds may become impaired due to a variety of pollutants. The purpose of the monitoring
program is to collect data in the watersheds to establish baseline data and to monitor the progress
of implemented Best Management Practices. The Monitoring Program may include piped and
ditched outfall monitoring, BMP monitoring, and and/or in-stream monitoring.
USC does not plan to do any routine monitoring, unless a concern is identified. If requested, we will
evaluate potential problems and work to determine a resolution.
Element 11 – Public Education and Outreach on Storm Water Impacts and Public
Involvement and Participation
Element 11 requires the City to implement an educational program that includes disseminating
information to the public, engaging the public in the process, and training of City staff on the impact
of storm water discharges.
USC intends this Storm Water Management Plan as a useful tool and a step in our education for
staff, faculty, and students. USC architects, planners, and engineers will review plans that impact
storm water runoff with the City of Columbia and will work with City engineers to design projects in
compliance with NPDES procedures.
VIII. Total Maximum Daily Loads (TDML) and Impaired Water Bodies
Any existing Total Maximum Daily Loads (TDMLs) in place at the time of this NPDES permit are
incorporated into the permit. The most recent version of the SC DHEC Section 303(d) List contains a
list of impaired water bodies within the State of South Carolina. Upon written notification from SC
DHEC that a TMDL is approved for a water body in the Columbia area, the City will be required to
modify their Storm water Management Plan, assess and upgrade controls, monitor for
improvements, and report annually to SC DHEC.
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The City must also address any impaired water bodies featured on the Impaired Water bodies
303(d) List. This will require implementing a plan to determine if storm water discharges from the
regulated MS4s contributed to impairment. If it is determined that the regulated MS4s contributed
to impairment, the City must implement Best Management Principles to address the pollutant of
concern to the Maximum Extent Practicable (MEP), in order to reduce the discharge of pollutants.
IX. Congaree Watershed Management
Rocky Branch Creek is a part of the Congaree River Watershed. Rocky Branch Creek flows through
the main portion of the University of South Carolina and into the Congaree River in the Olympia
area. The Congaree River Watershed occupies 140,459 acres of the Sandhills and Upper Coastal
Plain regions of South Carolina. There are a total of 269.7 stream miles and 643.2 acres of lake
water in this watershed.
Currently, Rocky Branch Creek is not subject to a TDML, and it is not on the current EPA’s Impaired
Water bodies 303(d) List.
USC designers, project managers, and contractors must ensure that plans for water quality and
watershed protection be considered as principles of good construction. These include the following:
1. Encourage development in high-density areas or areas with existing storm sewer infrastructure.
2. Preserve, protect, create, and restore ecologically sensitive areas such as:
a. Wetlands,
b. Riparian areas,
c. Headwaters, and
d. Floodplains.
3. Prevention of water quality impacts to streams by:
a. Providing buffers along sensitive water bodies,
b. Disconnecting discharges to surface waters from impervious surfaces, such as parking
lots,
c. Minimize impervious surfaces.
4. Minimize disturbance of soils and vegetation and/or
5. Maintain and/or increase dedicated open-space areas.
Refer also to Section X for City of Columbia’s Procedure for Construction Storm Water Runoff
Control.
X. City of Columbia Procedure for Construction Storm Water Runoff Control
For USC properties located in the City of Columbia, the following procedure must be followed when
construction is planned that will create land disturbance for storm water discharges:
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1. Submit and receive Land Disturbance Approval from the City of Columbia. NPDES coverage is
also required from SC DHEC if 1 acre or more will be disturbed.
2. Hold a Pre-Construction meeting with operators, engineers, and City of Columbia Storm Water
Management staff.
3. Notify the City of Columbia Utilities and Engineering staff (including Storm Water) 48 hours
before beginning land-disturbing activities.
4. Complete installation of the construction entrance(s).
5. Provide clearing and grubbing only as necessary for installation of perimeter controls.
6. Install perimeter controls (e.g. silt fences).
7. Provide clearing and grubbing only in areas of basins/traps/ponds.
8. Install basins/traps/ponds and install diversions to those structures. Outlet structures must be
completely installed as shown on the details before proceeding. Areas draining to these
structures cannot be disturbed until the structures and diversions to the structures are
completely installed.
9. Provide clearing and grubbing of site or demolition. Sediment and erosion control measures for
these areas must already be installed.
10. Begin rough grading.
11. Install storm drain system and placement of inlet protection as each inlet is installed.
12. Begin fine grading, paving, etc.
13. Begin permanent stabilization.
14. Clean out detention basins that were used as sediment control structures and re-grade
detention pond bottoms. If necessary, modify sediment basin riser to convert to detention
basin outlet structure.
15. Remove temporary sediment and erosion control measures after entire area draining to the
structure is finally stabilized. It is recommended that project manager have the Storm Water
Pollution Prevention Plan (SWPPP) preparer approve the removal of temporary structures.
16. Perform as-built surveys of all detention structures and submit to City of Columbia MS4 for
acceptance.
17. Submit Notice of Termination (NOT) to City of Columbia MS4, as appropriate.
XI. USC’s Illicit Discharge Detection and Elimination Plans
1.
Develop Storm Water Sewer System Map
Areas that impact, or potentially impact, Rocky Branch Creek are a major area of concern for
protecting the Congaree Watershed. In this regard, we are developing a map of the USC MS4
system in the vicinity of Rocky Branch Creek. If other areas are determined to be high priority
areas, maps will be developed for these areas, as well.
2. Identify Other Priority Areas Within the MS4 System
Priority areas may be determined by the following information:
a. Areas with older, decaying infrastructure are more likely to have leaking connections.
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b.
c.
d.
e.
Commercial/industrial areas.
Areas with a history of illicit discharges.
Areas that may have experienced illegal dumping.
Areas with sewer lines older than 40 years or with a history of sewer overflows or crossconnections.
3. Illicit Discharge Investigation Procedure
EHS will initiate an investigation when evidence is discovered of an illicit non-storm water
discharge. The investigation will involve the following:
a. Verify that an illicit discharge has occurred.
b. Determine the source of the illicit discharge.
c. If an illicit discharge has occurred, contact the Associate Vice President of Health and
Safety, or his designee, within 24 hours with details about the discharge.
d. Document investigation findings.
e. Enter discharge information into EHS Investigation Report database on I Drive.
4. Corrective Action
a. Determine the responsible party. Notify responsible party and develop a plan for
elimination.
b. Conduct a follow-up investigation to verify the discharge has been eliminated.
c. Document the follow-up investigation.
5. Contact Information
For questions about storm water and to report a possible storm water illicit discharge at USC,
contact the following:
Roddy Whitaker at 803-777-2839 (8 AM – 5 PM, Monday through Friday)
If unavailable, call USC Police Department at 803-777-4215 (24-Hour Dispatch)
XII.
Penalties For Violations of NPDES Permit Conditions
1. Penalties for Violations of Permit Conditions
a. Criminal.
Negligent Violations, Knowing Violations, and Knowing Endangerment. The SC Pollution
Control Act provides that any person who negligently violates permit conditions under
Section 48-1-320 of the Act is subject to a fine of not less than $500 or more than
$25,000 per day of violation, or by imprisonment for not more than 2 years, or both.
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False Statement. The SC Pollution Control Act provides that any person knowingly
makes any false material statement, representation, or certification in any application,
record, report, plan, or other document filed or required to be maintained under the Act
or who knowingly falsifies, tampers with, or renders inaccurate any monitoring device or
method required to be maintained under the Act, shall upon conviction, be punished by
a fine of not more than $10,000 or by imprisonment for not more than 2 years, or by
both. For subsequent violations, punishment shall be by a fine of not more than
$25,000 per day or by imprisonment of not more than 2 years, or by both.
b. Civil Penalties
The SC Pollution Control Act provides that any person who violates a permit condition
under Section 48-1-330 of the Act is subject to a civil penalty not to exceed $10,000 per
day of such violation.
XIII. New 2013 Construction General Permit (CGP) for Storm Water
Discharges
DHEC issued a new Construction General Permit (CGP) for storm water discharges from construction
activities which became effective January 1, 2013.
The new regulation have provided operator categories for primary permittee (generally the owner),
secondary permittee (builder or contractor), and contractors (employed by primary or secondary
permittee) whose work will involve soil disturbance. The following are some major changes which
are now occurring with storm water management programs:
1. A comprehensive storm water pollution prevention plan (C-SWPPP) and notice of intent (NOI)
must be filed with the City of Columbia for construction projects which disturb >5,000 square
feet of soil using some revised best management practices (BMPs) for erosion control. The CSWPPP must cover all construction activities under new the 2012 CGP.
2. Under new regulations, the inspector (CEPSCI qualified) will ensure compliance with an on-site
SWPPP (OS-SWPPP), ensure changes are implemented, tract construction progress, and aid in
department reviews. The (OS-SWPPP) will be kept at the construction site and will act as a living
document until final stabilization is completed.
3. The OS-SWPPP must include the SCDHEC CGP, NOI, NPDES coverage approval letter, Contractor
Certifications, Local Approvals if required, USACE Approvals if required, Critical Area Permit
(Coastal Zone only), Coastal Zone Consistency Certification (Coastal Zone only), pre-construction
conference logs, stabilization log, rain log, and contractor log.
4. Any contractors whose work will disturb soils must submit a project-specific contractor
certification form and attend a pre-construction conference. These records will also be kept in
the OS-SWPPP.
5. The inspector must submit an Annual Blanket Notice of Intent (AB-NOI) each calendar year
beginning January 1.
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6. Each construction site will either keep a rain gauge or use a certified weather station report
from within a 25-mile radius to record significant rainfall events of 0.5 inches or more. This will
also be a part of the OS-SWPPP.
7. The inspector must inspect each construction site at a minimum of once every 7-calendar days,
and it is recommended, but not required, they be inspected after significant rainfall events.
Inspection log must be kept with OS-SWPPP.
8. The inspector is responsible for inspection and reporting as they relate to the approved SWPPP.
If the SWPPP is ineffective or inspection shows problems, it must be revised or corrected within
7 calendar days following inspection.
9. The inspector must ensure OS-SWPPP is correct, BMPs are used appropriately, and corrective
actions are completed and documented.
10. Copies of C-SWPPP, OS-SWPPP, and all documentation required by the permit, including NOI,
must be retained for at least 3 years from date coverage permit is terminated.
11. All SWPPPs that are still active must be updated in accordance with current regulations.
Revisions will include recordkeeping, non-numeric effluent limits, revising site inspection
frequency to once every 7-calendar days, rain gauge log, and inspection records.
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