The Ohio State University Storm Water Management Program Post‐Construction BMP Operations and Maintenance Guidance Manual December 1, 2009
Contents Section 1 1.1 1.2 1.3
Section 2 2.1 2.2 2.3 2.4 2.5 2.6
2.7
Section 3
Purpose and Need .................................................................................................... 1-1 Guidance Manual Organization ............................................................................. 1-2 Guidance Manual Definitions and Acronyms...................................................... 1-2
Post-Construction BMP Operations and Maintenance Requirements OSU’s MS4 Permit and Post-Construction BMPs ................................................ 2-1 Construction General Permit – Summary of Requirements ............................... 2-3 Storm Water Pollution Prevention Plan: Post-Construction Operation and Maintenance Requirements ............................................................................. 2-3 Assigning Unique BMP Identification Numbers ................................................. 2-4 Recertification of BMPs by an Engineer ................................................................ 2-4 How to Use this Guidance Manual ........................................................................ 2-6 2.6.1 Using the Guidance Manual .................................................................... 2-6 2.6.2 BMP Maintenance Inspection Forms and BMP Maintenance Work Order ................................................................................................ 2-7 2.6.3 Completing BMP Maintenance Inspection Forms and BMP Maintenance Work Order Forms ............................................................ 2-7 2.6.4 Contents of OSU’s Post-Construction Operations and Maintenance Plans .................................................................................... 2-8 OSU’s Post-Construction Storm Water Operation and Maintenance Program Procedures ................................................................................................. 2-8
Best Management Practice (BMP) Inspection and Maintenance
3.2 3.3
Criteria Operations and Maintenance Criteria ................................................................... 3-1 3.1.1 Keys to Identifying when Maintenance Needs to be Performed ......... 3-2 Proper Disposal of BMP Maintenance Waste Materials ..................................... 3-3 Types of Maintenance .............................................................................................. 3-4
4.1 4.2
OSU’ Post-Construction Storm Water Management Controls OSU’s Structural BMP Types .................................................................................. 4-1 OSU’s Non-Structural BMP Types ......................................................................... 4-3
3.1
Section 4
Section 5
Introduction
References
Appendices Appendix A Appendix B Appendix C Appendix D
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BMP Maintenance Work Order BMP Maintenance Inspection Forms BMP Location Map OEPA-Construction General Permit i
The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual
Figures 2-1 2-2
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BMP location map .................................................................................................... 2-5 OSU’s Post-Construction Storm Water Operations/Maintenance and Inspection Procedural Flowchart ........................................................................... 2-9
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Tables 2-1 3-1 3-2 4-1
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OSU’s Post-Construction BMPs and Measurable Goals .................................... 2-2 Waste Disposal Types and Methods ...................................................................... 3-3 Types of Maintenance .............................................................................................. 3-4 OSU’s Post-Construction BMPs .............................................................................. 4-1
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Section 1 Introduction The Ohio State University (OSU) was identified as being an owner/operator of a municipal separate storm sewer system (MS4) in 2001. The Ohio Environmental Protection Agency’s (OEPA) National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) permit required development of a Storm water Management Plan (SWMP) to provide guidance on how OSU will implement storm water controls that meet the minimum control measure (MCM) of the permit. OSU developed and submitted the university’s SWMP in March of 2003 that contained best management practices (BMPs). One of the MCMs is to implement post-construction storm water quality controls as part of construction projects that disturb one acre or more of land. OSU identified the following postconstruction BMPs in the 2003 SWMP: Implementation of a Formal Storm Water Management Plan – This includes
incorporating the formal SWMP into the University’s Utility Master Plan. This master plan describes specific measures OSU will take to improve storm water quality. Detention/Retention Ponds/Basins – This program activity includes quantifying
past and present use of retention/detention across OSU property. OSU will also, as part of this BMP, develop guidelines for runoff reduction. Implement Research Programs for Innovative Storm water Management – This
program activity includes working with faculty, student/staff organizations and university departments to site, design and implement projects/programs for innovative storm water management. The innovative nature of these activities will combine some of the unique physical aspects of campus along with the resources of one of the nation’s leading research institutions to identify and fund innovative research projects. The regulatory permit cycles cover five years . In January 2009, OEPA issued the second generation permit. The second generation permit provides more prescriptive activities that need to be implemented to meet the post-construction storm water control requirements.
1.1 Purpose As a regulated entity under OEPAs NPDES second generation permit, OSU is required to: Develop and implement strategies before and during construction that include a combination of structural and non-structural best management practices to control and treat storm water after construction is complete.
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The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual Section 1 – Introduction
Ensure adequate long-term operation and maintenance of each installed postconstruction BMP. Identify responsible parties to implement, operate, and maintain postconstruction storm water BMPs. The purpose of this Post-Construction BMP Operations and Maintenance Guidance Manual is to provide OSU with a consistent, organized and structured method with which to operate, inspect, and maintain post-construction best management practices.
1.2 Guidance Manual Organization This Guidance Manual is organized as follows:
Section I - Introduction
Section II – Post-Construction BMP Operations and Maintenance Requirements – Provides an overview on the information and activities required to be implemented to meet the permit requirements associated with PostConstruction operations and maintenance. Provides information on how to use the Guidance Manual, how the forms are organized, how to use the forms, and what needs to be included in a post-construction operations and maintenance plan for OSU projects that disturb one or more acre of land. Provides a program flow chart which outlines how this Manual and the forms will address the permit requirements.
Section III – BMP Inspection and Maintenance Criteria – Provides information on OSU’s post-construction BMP operation and maintenance criteria and procedures.
Section IV – Recommended Post-Construction BMPs – Provides an overview of the types of BMPs that are recommended for OSU.
References
Appendices
This Guidance Manual is structured to allow OSU personnel to update and modify checklist information as necessary and should, at a minimum, be reviewed and evaluated every five years and revised accordingly to incorporate new OEPA NPDES storm water permit requirements.
1.3 Guidance Manual Definitions and Acronyms This Manual contains regulatory acronyms and terms that are defined below. The definitions/acronyms below are not intended to be the total comprehensive list, but are intended to be revised as necessary to accommodate additional definitions and terminology as needed:
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The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual Section 1 – Introduction
BMP CFR CGP CMS CO CPESC CWA GIS HSTS MCM MEP MS4 NEPA NOI NOV NPDES ODH ODNR ODOT OEPA O/M OPI ORC OWS PE QA/QC QA/QR QAR ROW SAO SWMP SWPPP TMDL TPR TSEC USEPA
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Best Management Practice Code of Federal Regulations Construction General Permit Construction and Material Specifications Central Office Certified Professional in Erosion and Sediment Control Clean Water Act Geographical Information System Household Sewage Treatment Systems Minimum Control Measure Maximum Extent Practical Municipal Separate Storm Sewer System National Environmental Policy Act Notice of Intent Notice of Violation National Pollutant Discharge Elimination System Ohio Department of Health Ohio Department Natural Resources Ohio Department of Transportation Ohio Environmental Protection Agency Operations and Maintenance Operational Performance Index Ohio Revised Code Oil/Water Separator Professional Engineer Quality Assurance/Quality Control Quality Assurance/Quality Review Quality Assurance Review Right-of-Way State Architect’s Office Storm Water Management Program/Plan Storm Water Pollution Prevention Plan Total Maximum Daily Load Technical Process Review Temporary Sediment & Erosion Control United States Environmental Protection Agency
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Section 2 Post-Construction BMP Operations and Maintenance Requirements This section provides information on the regulatory requirements that OSU is required to address as part of OSU’s SWMP. This section deals specifically with the post-construction control requirements of the permits and what OSU is required to implement and manage as part of these requirements. As mentioned in Section 1, OSU is an owner/operator of a separate storm sewer system and is regulated under the MS4 program. OSU also conducts development and construction activities that exceed the one acre land disturbance threshold. These development/construction activities require OSU to comply with OEPAs NPDES Construction General Permit (CGP) requirements. The following information will provide a summary of permit requirements for the CGP and provide general information as to what these requirements mean to OSU with regards to post-construction storm water management. This section will provide information associated with:
OSU’s MS4 Permit and Post-Construction BMPs – Provides a brief summary of OSU’s MS4 permit requirements specific to post-construction controls, and provides general information on OSU’s MS4 post-construction BMPs.
The CGP – Summary of Requirements – Provides a brief summary of the CGP and what OSU is responsible for in terms of project permit requirements.
The Storm Water Pollution Prevention Plan (SWPPP) - Post-Construction Operation and Maintenance Requirements provides information on what needs to be included in the SWPPP associated with post-construction controls.
Assigning unique BMP identification number.
Recertification of BMPs by an Engineer.
How to use this Guidance Manual – Provides an overview on how to use this Guidance Manual.
OSU’s Post-Construction Storm water Operation and Maintenance Program Procedures – Provides information on OSU’s program procedures.
2.1 OSU’s MS4 Permit and Post-Construction BMPs OSU, as a regulated entity under the MS4 permit, has to address both the MS4 permit requirements and the CGP requirements. OSU, under the MS4 permit has developed three BMPs to meet the MS4 post-construction permit requirement. The BMPs and the measurable goals are included in Table 2-1.
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Table 2-1 OSU’s Post-Construction BMPs and Measurable Goals Post-Construction BMP
Measurable Goal Obtain Funding
Develop and Implement a formal Storm water
Retain Consultant to develop plan
Management Plan
Plan preparation Plan Implementation Quantify detention/retention
Detention/Retention Ponds/Basins
Develop guidelines for improvements Implement Program Identify potential research topics/areas
Implement Research Programs for innovative
Identify research sites
Storm water Management
Assist faculty with soliciting funding for research projects.
Additional information on these MS4 post-construction BMPs can be found in OSU’s Storm Water Management Plan (March 2003). The MS4 SWMP information is provided as background to provide the framework for addressing how and why OSU is a nontraditional regulated entity. The following information provides some of the limitations that OSU faces with being a non-traditional regulated MS4 entity:
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OSU is not a political entity and does not have the ability to develop and pass ordinances or regulations.
OSU can, through design requirements and specifications, require that postconstruction controls be designed and constructed as part of OSU projects, and can also perform project design reviews as a method to ensure that appropriate post-construction controls are being designed according to OSU’s design policy. OSU can perform construction inspections to ensure the BMPs are being installed per plan.
As OSU conveys and discharges storm water runoff during and after storm events to waters of the state and to the City of Columbus’s storm sewer systems. As a regulated MS4 entity, OSU is required to the maximum extent practicable (MEP) to provide post-construction storm water management for runoff being discharged into the City of Columbus’s storm sewer systems. OSU implements these permit requirements through post-construction BMPs
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from both the MS4 and CGP. OSU needs to better understand the interaction between OSU’s storm sewer system and the City of Columbus’s storm sewer system relating to post-construction storm water discharges, storm water quality and quantity issues.
2.2 Construction General Permit – Summary of Requirements For OSU projects that disturb more than one acre, OSU shall address, implement, and comply with the CGP requirements (the entire permit has been included in Appendix C). Several key permit requirements are listed below:
OSU shall complete and submit to OEPA a Notice of Intent (NOI) for each project meeting the one acre land disturbance threshold.
Projects meeting the minimum land disturbance threshold shall include a storm water pollution Prevention Plan (SWPPP). The SWPPPs shall include the following:
o
Identification of potential sources of pollution which may reasonably be expected to affect the quality of storm water discharges associated with construction activities.
o
Comprehensive document that addresses the permit requirements as stated in Part III. G of the OEPA NPDES CGP. This references the permit sections associated with developing a Storm Water Pollution Prevention Plan. (See Appendix C – Construction General Permit).
o
Descriptions and assurances that implementation of BMPs reduce the pollutants in storm water discharges during construction and pollutants associated with post-construction activities.
OSU shall complete and submit a Notice of Termination (NOT) at the completion of the project.
2.3 Storm Water Pollution Prevention Plan: PostConstruction Operation and Maintenance Requirements For OSU projects that require development of a SWPPP, OSU’s post-construction program shall provide perpetual management of runoff quality and quantity. The SWPPPs are typically designed by the consulting engineer and, at a minimum, include the following post-construction control permit requirements:
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Description of post-construction BMPs to be installed.
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Rationale for post-construction BMP selection. Rationale shall address estimated impacts on channels, floodplains, stream morphology, hydrology, and surface water quality.
Detailed post-construction BMP drawings.
The above information is to be incorporated as part of the SWPPP for OSU projects that require post-construction runoff controls. OSU’s storm water management program shall include activities whereby OSU personnel review the submitted SWPPPs and perform BMP construction inspection during installation. Detailed information on the post-construction BMP selection rationale, post-construction BMP design guidance, and post-construction BMP drawing requirements are not covered in this Guidance Manual.
2.4 Assigning Unique BMP Identification Numbers OSU, as part of the MS4 permit, maintains a storm sewer system and supporting base mapping. This base map includes storm sewer system pipes, outfalls, open channels, and post-construction (Quantity and Quality) controls which are part of OSU’s storm sewer system infrastructure and have been located on the base map. The postconstruction controls have been given a “Best Management Practice” identification number which will be used when completing the maintenance inspection and completed reports as a way to integrate the BMP reports with the mapped BMPs. As new BMPs are constructed, OSU will update the base map with new postconstruction BMPs using the As-built drawings as required by the MS4 permit under the post-construction MCM5. Figure 2-1 provides information on the current postconstruction BMPs. An 11x17 drawing is located in appendix C.
2.5 Recertification of BMPs by an Engineer In general most of the maintenance performed by OSU maintenance/operations staff will not require any additional verification, other than to document that the maintenance was performed. However, OSU shall require an OSU engineer’s certification stamp or equivalent certification/inspection or evaluation associated with proper re-sizing of the control to ensure that the basin/control has retained the original design dimensions per plan. OSU requires controls of this type to include a “Maintained in-place As-built drawing” that is stamped to verify the following:
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Correct elevations
Inverts
Slopes (sides, bottom)
Control storage dimensions
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The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual Section 2 – Storm Water Management
Figure 2-1 BMP Location Map
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The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual Section 2 – Storm Water Management
The engineer’s required approval is for post-construction controls that collect sediment and this sediment needs to be mechanically removed. For OSU, these BMP types include wet and dry basins and forebay areas. The estimated frequency for the maintenance and corresponding certification are addressed appendices B-1 and B-2.
2.6 How to Use this Guidance Manual This section provides information on how to use the Guidance Manual, how the BMP maintenance inspection forms are organized, how to fill out the forms and what needs to be included in the post-construction operations and maintenance plan for OSU projects. This Guidance Manual has been developed for OSU to use and establish a proactive “stand alone” post-construction operations and maintenance program. The following provides information on how to use the Manual, BMP forms and components of project level operations and maintenance plan.
2.6.1 Using the Guidance Manual This Manual is to be used for performing maintenance inspections on structural postconstruction controls that were designed and constructed to meet OEPA permit requirements. These structural post-construction controls will be maintained and operated as part of OSU’s storm sewer system infrastructure. This Manual includes:
Program procedures flowchart (Section 2.7) - The flow chart provides procedural information on how to implement program, when to use what forms and what to do with the completed forms.
BMP Maintenance Inspection forms – Forms provide maintenance information to be completed during inspection.
Frequency of Maintenance – The maintenance frequencies are divided into five different time intervals – Annual, Semi-Annual, Quarterly, Monthly, and after large storm events.
Individuals using this Guidance Manual shall have a general understanding of OSU’s storm water program and implementation of OSU maintenance activities on storm sewer infrastructure. Using this Manual requires the individual to be knowledgeable about post-construction storm water controls, including:
General knowledge on how these controls work.
General knowledge on BMP construction and installation techniques.
General Knowledge on BMP maintenance and restoration.
The individual shall also be able to:
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Select the appropriate BMP maintenance inspection form.
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The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual Section 2 – Storm Water Management
Perform BMP maintenance inspections.
Correctly fill out the BMP maintenance inspection form. Completely filling out this form will provide information on required BMP maintenance which will assist with prioritizing maintenance activities.
Perform follow up inspections once maintenance has been performed.
2.6.2 BMP Maintenance Inspection Forms and BMP Maintenance Work Order The BMP maintenance inspection forms include the following information:
Maintenance Items – These items have been grouped by their BMP components (e.g., detention basin groups include embankments, emergency spillway, inlets and outlets).
Inspection Frequency – This provides information on how often certain BMP elements shall be inspected.
Inspection Items – These items include BMP components inspected during any given maintenance inspection along with the recommended maintenance. The inspections indicate which BMP elements need maintenance to be performed and a follow up inspection is made to ensure that any maintenance recommended has been performed and the BMP restored to operating as designed status.
Summary of Maintenance Required – Space to describe what type of maintenance is recommended.
Filling out the BMP Maintenance Work Order – Once maintenance is identified, OSU inspection personnel shall complete a BMP maintenance work order to initiate the maintenance process.
2.6.3 Completing BMP Maintenance Inspection Forms and BMP Maintenance Work Order Forms The BMP maintenance inspection forms are developed for ease of use. Completing the BMP forms requires the following:
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On-site BMP field visit
Fill in the appropriate cells based on the BMP type. Filling in the cells requires reading the maintenance question and answering yes or no.
Provide enough information in the Maintenance needed column of the BMP maintenance inspection form such that when scheduling the BMP
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The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual Section 2 – Storm Water Management
maintenance, the BMP maintenance work order form can be easily filled out and the maintenance performed by mobilizing the correct equipment and personnel to the BMP location.
2.6.4 Contents of OSU’s Post-Construction Operations and Maintenance Plans OSU’s post-construction operations maintenance plans (PCOMP) must be standalone documents that incorporate the following:
Designated entity for storm water inspection and maintenance – which will be OSU personnel
Identified routine and non-routine maintenance tasks to be performedIncluded as part of the BMP checklists
Schedule for Inspection and Maintenance – Noted in the BMP checklists
Maintenance agreements with OSU departments and easements as necessary – These may be required on specific BMPs as necessary.
Jennings Hall OSU
Map – showing access and maintenance easements.
The BMP inspection forms are included in Appendix B.
2.7 OSU’s Post-Construction Storm Water Operation and Maintenance Program Procedures This section provides information on how OSU’s post-construction storm water operations and maintenance program is organized, how to identify what BMP forms to use, and when to use them. Figure 2-2 provides this information in a flowchart format.
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The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual Section 2 – Storm Water Management
Figure 2-2 OSU’s Post-Construction Storm Water Operations/ Maintenance and Inspection Procedural Flowchart OSU project requires Post-Construction BMP to be Designed/Constructed BMP Design completed by others
BMP Constructed by others. BMP construction inspection performed by OSU staff
OSU Post-Construction BMP Approved and Operating Select Appropriate BMP Inspection Form from Manual - Appendix B
Determination on When to Inspect Post-Construction BMPs
Done – No Further Action
Yes
Is BMP Functioning ?
Is it time for the scheduled Maintenance Inspection?
No
No
Done – No Further Action
Yes Conduct Maintenance Inspection and Identify Maintenance Needs
Complete BMP Maintenance Inspection Form and BMP Maintenance Work Order Form Perform Follow up Inspection to Ensure Maintenance Performed and BMP Operates as Designed/Intended
File Maintenance Inspection Report
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Section 3 Best Management Practice (BMP) Inspection and Maintenance Criteria OSU’s Post-Construction Best Management Practices (BMPs) are designed to treat storm water from the constructed project. The controls become part of the storm sewer/drainage infrastructure and need to be inspected, operated, and maintained at to the same level as other OSU storm sewer infrastructure. By design, the BMPs collect, detain, hold, and absorb storm water pollutants over time. These pollutants will collect in the controls, thus reducing capacity to treat, store, or detain runoff. By their nature they are designed to collect pollutants and therefore need to have the pollutants removed to ensure proper performance and functionality. Performing scheduled maintenance inspections and routine maintenance will extend the life of the control and reduce potentially more expensive maintenance. This section provides OSU post-construction program information on the following:
Operations and Maintenance Criteria
Proper Disposal of BMP spoils
Summary of BMP Maintenance Types
3.1 Operations and Maintenance Criteria Each BMP that OSU designs, constructs or operates/maintains requires some level of maintenance at some frequency. This section addresses information on when maintenance should be performed, what types of maintenance require engineering certification, and information on proper disposal procedures. Section 3.5 will provide detailed information on the types of maintenance and Section 4.0 will provide information on the types of post-construction BMPs and the maintenance and inspection items associated with each. Structural and Non-structural Practices at OSU
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The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual Section 3 – Best Management Practice (BMP) Inspection and Maintenance
3.1.1 Keys to Identifying when Maintenance Needs to be Performed With any storm water sewer system infrastructure, operations and maintenance are critical activities to ensure long-term function and benefit. Post-construction controls become part of the storm sewer system infrastructure once constructed and need to be operated and maintained just like the storm sewer system. These controls are designed to perform certain functions, some of the controls collect and hold runoff for a period of time, some allow the runoff to pass through the system either horizontally or vertically, and others function more as a filter. With each control potentially performing or functioning differently, the maintenance needs to address these differences and be tailored for each BMP or BMP type. The following are signs or indicators that the control needs to have maintenance performed:
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Decline in Controls Appearance – Vegetation overgrown, litter collecting in the basin, and general decrease in the appearance of the control.
Standing Water – Outlet controls may need to be maintained, settling or erosion which has caused isolated areas of standing water. Health issues associated with mosquito breeding areas. Lack of controls’ ability to infiltrate runoff.
Odors – Standing water, leaching ground water, trash collecting in the control.
Accumulation of material (e.g., sediment, trash, other) in the control.
Erosion occurring at the inflow areas or outlets of side slopes.
Raingardens/Bioretention Facility at OSU
Plugged outlet control structure.
Illegal dumping within or adjacent to the control
Vandalism
Invasive vegetation and overgrown vegetation
Encroachment
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The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual Section 3 – Best Management Practice (BMP) Inspection and Maintenance
Condition of downstream receiving stream – Degrading
Public or third party requests/complaints
As part of OSU’s BMP operations and maintenance program, the items above are incorporated into the BMP checklists for the different types of controls. The information mentioned above is not intended to be a comprehensive list, however these are indicators of when maintenance should be scheduled or inspection performed to identify the appropriate maintenance. The procedure flowchart in section 2.6 provides information on how to determine when maintenance needs to be performed. The checklists incorporate these issues and can be revised as necessary to meet additional OSU post-construction BMP operation and maintenance requirements or issues.
3.2 Proper Disposal of BMP Maintenance Waste Materials During maintenance of post-construction BMPs certain types of waste materials will be collected that will need to be disposed of. Table 3-1 includes the type of waste and recommended disposal method. Table 3-1 Waste Disposal Types and Methods Type of Waste
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Proposed Disposal Method
Trash
Landfill or recycle collected trash
Basin sediment
Removal of accumulated sediment in basin bottom, this can be applied to adjacent land. Removed sediment shall be leveled and stabilized to minimize re-deposition of sediment into the basin or the receiving streams. Basin sediment that may contain oils, grease, heavy metals or toxic materials should be disposed of in a permitted landfill. Testing may be required to determine if the sediment needs to be disposed of in a permitted landfill disposal.
Catch Basin Sediment and Trash
Landfill or recycle trash. Collected sediment shall be dewatered by placing in a covered area to allowing for drying. The collected or captured decanted water shall be treated appropriately via a sanitary system or collected and hauled to a permitted disposal facility. Should the
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Type of Waste
Proposed Disposal Method sample tested not be considered hazardous recycle the dewatered sediment material by using these as leveling material and stabilize appropriately. (Note: Care to be taken not to re-suspend sediments in runoff).
Vegetation Removal
Remove and recycle through mulching as applicable.
3.3 Types of Maintenance This section contains summary information on the types of BMP maintenance that OSU will implement as part of the post-construction operations and maintenance program. In general, in terms of prioritizing maintenance, corrective maintenance is the highest priority as necessary, followed by preventative maintenance and then aesthetic maintenance. Table 3-2 provides information on the type of maintenance and a brief description on what the maintenance activities include for these maintenance types. The practices identified in the table are not intended to be a comprehensive list. OSU has incorporated this maintenance information as part of the maintenance and inspection forms provided in Appendix B. Table 3-2 Types of Maintenance Type of Maintenance
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Description
Emergency Maintenance
Maintenance performed to prevent loss of life, major damage to control or repair associated with a rain event or flooding.
Debris and Litter Removal
Includes collection and removal of debris and trash from the control.
Sediment Removal and Disposal
Excavate accumulated sediments or other solids. See Table 3-1 for disposal information.
Stability and Erosion Control
Repair exposed soil areas in or adjacent to the control. Level or re-grade areas that show evidence of sheet or rill erosion. Stabilize repaired area.
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Type of Maintenance
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Description
Maintenance of Mechanical Components
Ensure mechanical controls are in good working repair. These may include gates, pumps, flow controls or other items which are operated by hand or electronically.
Vegetation Maintenance
Mowing and removal of invasive species.
Maintenance of Aquatic Environment
Wet Ponds – Remove surface algae blooms, ensure outlet control and spillway are functioning, mow /maintain side slopes to water edge, remove floatables and remove unwanted water vegetation.
Insect Control
Maintain and eliminate standing water and items that can hold water from control. Maintain perimeter vegetation to design specifications and mow as specified.
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Section 4 OSU Post-Construction Storm Water Management Controls Post-construction controls are divided into two types: 1) Structural controls – A device, practice, or method for removing, reducing, retarding, or preventing targeted storm water runoff constituents, pollutants, and contaminants from reaching receiving waters; 2) Non-structural controls – Focused on preserving open space, protecting natural systems, and incorporating existing landscape features such as wetlands and stream corridors into a site plan to manage storm water at its source. Some focus on clustering and concentrating development, minimizing disturbed areas, and reducing the size of impervious areas. This section provides recommendations, structural and non-structural BMPs, which OSU has approved for use on University projects. Maintenance Inspection forms are included in Appendix B for each of the recommended BMP. The remainder of this section provides information on the recommended BMP types, both structural and non-structural.
4.1 OSU’s Structural BMP Types OSU’s structural BMPs are designed to remove pollutants from storm water runoff, reduce downstream erosion, provide flood control, and promote groundwater recharge. Structural BMPs typically require engineering, design and should be inspected during construction to ensure they are installed per plan. The recommended BMPs are outlined in Table 4-1. The table includes the BMP name and BMP description for each BMP and a MS4 information column. Table 4-1 OSU’s Post-Construction BMPs Best Management Practice Title
Dry Extended Detention
Wet Extended Detention
Pre-Treatment - Forebay
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BMP Description Basins that have been designed to detain storm water runoff for some minimum time to allow particles and associated pollutants to settle Constructed basins that have permanent pool of water throughout the year. Ponds treat incoming storm water runoff by allowing particles to settle and algae to take up nutrients. Area used in combination with other post-construction
* MS4 Information Measurable goals – Develop guidelines for runoff reduction, Quantify detention/retention
Measurable goals – Develop guidelines for runoff reduction, Quantify detention/retention
Measurable goals – Develop guidelines for runoff
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Best Management Practice Title
Constructed Wetland
Biorentention
Raingarden
BMP Description controls to settle out particles. This also minimizes maintenance associated with the post-construction control. Incorporate wetland plants into the design. As storm water runoff flows through the wetland pollutant removal is achieved through settling and biological uptake within the control These are depressions designed to incorporate many of the pollutant removal mechanisms that operate in a forested ecosystem. See Bioretention
* MS4 Information reduction, Quantify detention/retention
No cross reference with OSU’s MS4 SWMP.
No cross reference with OSU’s MS4 SWMP.
No cross reference with OSU’s MS4 SWMP. No cross reference with OSU’s MS4 SWMP.
Shallow impoundment which is designed to infiltrate storm water into the soil. Rock filled trench with no No cross reference with outlet that receives storm OSU’s MS4 SWMP. water runoff. Typically used in Infiltration Trench combination with other postconstruction BMPs (i.e. swales, detention basins). Permeable pavement surface No cross reference with typically built with an OSU’s MS4 SWMP. Porous Pavement underlying stone sub-base for temporary storage of runoff. Designed to treat and No cross reference with attenuate storm water runoff OSU’s MS4 SWMP. Enhanced Water Quality through vegetation which Swale slows the runoff allowing for sedimentation and infiltration into the underlying soils. Designed to treat sheet flow No cross reference with from adjacent surfaces. OSU’s MS4 SWMP. Function by slowing runoff Vegetated Filter Strips velocities and filtering out sediments and other pollutants. Designed to collect storm No cross reference with Cisterns water. OSU’s MS4 SWMP. *Information directly from OSUs Storm Water Management Plan (2003) Infiltration Basin
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4.2 OSU’s Non-Structural BMP Types Non-structural BMPs are storm water controls that prevent or limit entry of pollutants into storm water runoff at the source. These preventive types of controls are effective by reducing or eliminating pollutants from entering the runoff and subsequently can be removed from the receiving waters. This information has been included in this Guidance Manual to provide background on the non-structural type controls OSU currently performs associated with post-construction control maintenance. OSU’s non-structural controls:
Storm drain labeling
Spill Control and Countermeasure Plan activities that address proper storage/containment, handling and post-spill clean-up.
Street and Parking lot sweeping
For this Guidance Manual, no BMP maintenance inspection checklists have been developed for these controls.
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OSU Bioretention
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Section 5 References
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1.
American Society of Civil Engineers (1998) Urban Runoff Quality Management, WEF Manual of Practice No. 23, ASCE Manual and Report on Engineering Practice No. 87, Water Environment Federation , Alexandria, Va. and American Society of Civil Engineers, Reston, Va.
2.
Debo, T.N., et al. (1995) Municipal Storm Water Management, Boca Raton, FL.
3.
England, G., et al. (2007) Storm water BMPs Selection, Maintenance & Monitoring, Santa Barbra, CA.
4.
Watershed Management Institute Inc. (1997) Operation, Maintenance & Management of Storm water Management, Crawfordville, FL.
5.
North Carolina Department of Environment and Natural Resources (2007) NCDENR Storm water BMP Manual, Chapter 7 – BMP Inspection and Maintenance, North Carolina
6.
Charles River Watershed Association (2008) Low Impact Best Management Practice Information – Constructed Storm water Wetlands, Virginia
7.
Charles River Watershed Association (2008) Low Impact Best Management Practice Information – Wet Pond, Virginia
8.
Charles River Watershed Association (2008) Low Impact Best Management Practice Information – Grass Swales, Virginia
9.
U.S. Environmental Protection Agency (2007-2009) – BMP Inspection and Maintenance Factsheet, Washington D.C.
10.
U.S. Environmental Protection Agency (2007-2009) – Bioretention (Raingardens) Factsheet, Washington D.C.
11.
U.S. Environmental Protection Agency (2007-2009) – Infiltration Basin Factsheet, Washington D.C.
12.
U.S. Environmental Protection Agency (2007-2009) – Infiltration Trench Factsheet, Washington D.C.
13.
U.S. Environmental Protection Agency (2007-2009) – Porous Pavement Factsheet, Washington D.C.
14.
U.S. Environmental Protection Agency (2007-2009) – Catch Basin Inserts Factsheet, Washington D.C.
5-1
The Ohio State University Post-Construction BMP Operations and Maintenance Guidance Manual Section 5 - References
A
15.
U.S. Environmental Protection Agency (2007-2009) – Dry Detention Ponds Factsheet, Washington D.C.
16.
U.S. Environmental Protection Agency (2007-2009) – Wet Ponds Factsheet, Washington D.C.
17.
U.S. Environmental Protection Agency (2007-2009) – Storm water Wetland Factsheet, Washington D.C.
18.
U.S. Environmental Protection Agency (2007-2009) – Grassed Swale Factsheet, Washington D.C.
19.
U.S. Environmental Protection Agency (2007-2009) – Vegetated Filter Strip Factsheet, Washington D.C.
20.
City of Columbus – Division of Sewerage and Drainage – Department of Public Utilities (2006) – Storm water Drainage Manual, Columbus, Ohio
21.
Ohio Department of Natural Resources (2006) – Rainwater and Land Development (Ohio’s Standards for Storm water Management Land Development and Urban Stream Protection), Columbus, Ohio
5-2
Appendices These appendices have been included as tools for the user and can be easily modified as permit requirements change. A – BMP Maintenance Work Order Form B - Maintenance Inspection Forms C- BMP Location Map D- Construction General Permit
A
A-1
The Ohio State University Storm Water Program St W t Management M g tP g
pp Appendix A
Work Order for BMP Maintenance
Page 1 of 1
PROJECT INFORMATION : Work Order Number:
Project: OSU Campus BMP Type
Intiated By:
Date:
Checked by:
Date:
Location: OSU Crew Info: Ti t complete l t Minatenance Mi t (h ) Time to (hrs):
N Names:
Date Maintenance Completed: p
Equipment:
PROJECT DESCRIPTION:
Work Order for BMP Maintenance
1 Brief Description of Type of Maintenance Work to be Performed: 1.
p q p 2. Special requirements, permits or instructions associated with BMP maintenance:
3 Information to be documented/recorded for OSUs storm water program: 3. a a. Estimated amount of material removed during maintenance. maintenance b. Verification of proper disposal of spoil material. b material p c. Disturbed areas stabilized when maintenance complete? d d. Downstream conditions checked and documented prior to performing maintenance? Notes on downstream conditions:
e. Any follow up inspection required? Inspection and Miantenance Notes:
Appendix B - 1 Operation and Maintenance Inspection Report Form Dry Extended Detention BMP Identification ___________________________ Inspector Name ______________________
Inspection Date/Time ____________________ Inspection Frequency ____________________
Follow up Inspection to verify Maintenance Complete (Date) (Yes/No)
Maintenance Needed? (Yes/No)
Checked? (Yes/No)
Maintenance Items
Inspection Frequency*
Inspection Items
Summary of Maintenance Required
Dry Extended Detention Embankments a. Is there adequate vegetation and/or ground cover? b. Any undesirable vegetation and woody vegetation? c. Is the basin clear of trash and debris? d. Is the Low Flow channel clear of debris? e. Is there standing water or wet spots within the basin bottom? f. Any notable Embankment Erosion? g. Any Animal Burrows identified? h. Any notable sediment accumulation within the basin (If a forebay is part of basin, See form B- 3 for forebay maintenance)? i. Any noted cracking, bulging or sliding of dam/embankment? Condition of upstream Face
A A M SA SA SA A SA
A A
Operation and Maintenance Inspection report form – Basins
Page 1 of 5
Follow up Inspection to verify Maintenance Complete (Date) (Yes/No)
Maintenance Needed? (Yes/No)
Checked? (Yes/No)
Maintenance Items
Inspection Frequency*
Inspection Items
Summary of Maintenance Required
A Condition of downstream Face A Condition at or beyond Toe A Condition of Emergency Spillway Emergency Spillway, Trash Racks, Inlet and Outlet Controls j. Is the low flow orifice (outlet control structure) SA, S clear of debris or clogged? k. Is the inlet clear and free of debris? SA l. Does riprap need to be cleared of vegetation or A replaced at the inlet, downstream of the outlet or associated with the riser pipe? m. Is the basin functioning? M n. Is the emergency spillway clear of debris? A o. Is low flow or weir trash rack free of debris? A p. Is there notable corrosion on trash rack or other A metallic surfaces associated with outlet control system? q. Is there excessive sediment accumulation inside A riser? r. What is the condition of the A concrete//masonry/metal riser and barrels? A Cracks or displacement A Minor spalling (
