Operation maintenance of permanent stormwater controls overview of inspection requirements
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Operation & Maintenance of Permanent Stormwater Controls Overview of Inspection Requirements. Laura Prickett, AICP, CPESC EOA, Inc. Construction Inspection Workshop April 11, 2013. Outline of Presentation. Permanent Stormwater Controls that Require O&M Verification Inspections

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Operation maintenance of permanent stormwater controls overview of inspection requirements

Operation & Maintenanceof Permanent Stormwater ControlsOverview of Inspection Requirements

Laura Prickett, AICP, CPESC

EOA, Inc.

Construction Inspection Workshop

April 11, 2013


Outline of presentation

Outline of Presentation

  • Permanent Stormwater Controls that Require O&M Verification Inspections

  • O&M Requirements in the Municipal Regional Stormwater Permit

  • The O&M Verification Inspection Plan

  • Tools for Conducting, Tracking and Reporting O&M Inspections

  • For more information…


Permanent facilities that require o m inspections

Permanent Facilities that Require O&M Inspections

  • Provision C.3.h of the MRP requires agencies toconductinspectionstoverifyoperation & maintenance (O&M) of:

    • Stormwatertreatmentmeasures, and

    • Hydromodificationmanagementmeasures


Stormwater treatment measures

Stormwater Treatment Measures

  • Engineered systems that remove pollutants from stormwater runoff

Bioretention Area (biotreatment)


Stormwater treatment measures1

Stormwater Treatment Measures

  • Engineered systems that remove pollutants from stormwater runoff

Media Filter (limited use for Special Projects)


Hydromodification management hm facilities

Hydromodification Management (HM) Facilities

  • Reduce development-inducederosion

  • Detainstormwater so that post-projectpeakflows and durations match pre-projectconditions for a range of flows.


Hydromodification management hm facilities1

Hydromodification Management (HM) Facilities

  • Basins, tanks or vaults with specialized outlet that slowly releases water.

Detention basin with specialized outlet


O m requirements provision c 3 h

O&M Requirements(Provision C.3.h)

  • Agencies subject to the MRP must:

    • Require facility owners to conduct ongoing maintenance (e.g. , maintenance agreement).

    • Prepare and implement plan for annual O&M verification inspections, including new installations.

    • Conduct O&M verification inspections; provide enforcement as needed.

    • Track and report on inspections.


What about municipality owned facilities

WhataboutMunicipality-ownedFacilities?

  • O&M inspectionrequirements do notdistiguishbetween municipal and non-municipal facilities.

  • Inspect, track and reportonfacilitiesthatyourmunicipalityisresponsible for maintaining.


O m verification inspection plan

O&M VerificationInspection Plan

  • Begin implementingby 12/1/10.

  • Each fiscal year, inspect:

    • Allnewlyinstalledstormwatertreatment and HM controlswithin 45 days of installation

    • 20% of the total number of installedstormwatertreatment and HM controls (whenrounding, round up!)

    • 20% of allinstalledvault-basedsystems (round up)

  • Allinstalledtreatment and HM facilitiesmust be inspected at least once every 5 years.


Lessons learned from novs

Lessons Learned from NOVs

  • Round up whencalculating 20 percent of facilities per year.

    • Ifyouragency has fewerthan 5 facilities, be suretoinspectone per year.


Tools for inspecting tracking reporting

Tools for Inspecting, Tracking & Reporting

  • O&M VerificationInspectionChecklist

  • AnnualReportTable

  • Eachagencyshouldhaveaninternal tracking table, whichis NOT submittedwithAnnualReport.


O m verification checklist

O&M VerificationChecklist


Example tracking table mrp attachment g 1

Example Tracking TableMRP Attachment G-1


Draft annual report form c 3 h reporting table

DRAFT Annual Report FormC.3.h Reporting Table


For more information

For More Information…

  • Countywide Program Password Protected ND page www.flowstobay.org (click on “Municipalities,” then “ND”)

    • O&M Verification Inspection Plan Template

    • O&M Verification Inspection Checklist

    • Model maintenance agreement

  • Municipal Regional Stormwater Permit www.flowstobay.org (click on “Municipalities,” then scroll to “Municipal Stormwater Permit”)

  • May conduct as part of overall final inspection of constructed project UNLESS:

    • Stormwater treatment and/or HM facilities become operational earlier, IN WHICH CASE

      • Inspect and approve stormwater facilities before they become operational


Common issues in inspections of newly installed treatment measures

Common Issues in Inspections of Newly-Installed Treatment Measures

Laura Prickett, AICP, CPESC

EOA, Inc.

Construction Inspection Workshop

April 11, 2013


Outline

Outline

  • Purpose of inspection

  • What to look for during inspection

  • Common issues

  • Checklist for 45-day inspection


Purpose of inspection

Purpose of Inspection

  • Verifytreatmentmeasures and/orhydromodificationmanagementcontrols are installed per approvedplans.

  • At a minimum, inspectthosecomponentsthat are visible in thefinishedcondition.

  • Ifpossible, alsoinspectbelow grade componentsduringconstruction.


Prepare for the inspection

Prepare for the Inspection

  • Reviewprojectplanstoidentify:

    • Thenumber of treatmentmeasures and/or HM systemsto be installedonthesite.

    • Thelocations of treatmentmeasures and/or HM systems.

    • Thedimensions of treatmentmeasures and/or HM systems.


Prepare for the inspection1

Prepare for the Inspection

  • Review project plans to identify:

    • How high flows will be managed/diverted.

    • Type and extent of plant cover.

    • Type of approved irrigation system.

In thissystem, highflowswillenterraisedinlet.


During the inspection

During the Inspection

  • Confirmthatinstallationmatchesapprovedplansregarding:

    • Total number and type(s) of facilities.

    • Location of facilitiesonthesite.

    • Dimensions of facilities.

    • Requestconfirmationfromsitesuperintendentthatbiotreatmentsoilis per MRP specifications.


During the inspection1

During the Inspection

  • Confirmthatinstallationmatchesapprovedplansregarding:

    • Type and extent of plantcover.

    • Functionalirrigationsystem.

    • High-flow bypass oroverflowpath.

Overflowdraindesignedtokeepouttrash and debris.


Common issues

Common Issues

  • Is there exposed soil?

    • Exposed soil should be covered with 2” of mulch, except for area immediately surrounding tree trunks (roots need air).

  • Will vegetation block inlets to the treatment measure when mature?

Turf is blocking inlet; insufficient drop between pavement and top of grade in planting area.


Common issues1

Common Issues

  • Is there positive drainage to the treatment measures?

  • Is there permanent erosion control at points of concentrated flow?

Cobbles reduce erosion at entrance to bioretention area.


Common issues2

Common Issues

  • Are plants healthy?

  • Accumulation of sediment from construction activity?

    • Accumulated sediment must be removed.


O m verification checklist may be used for 45 day inspections will have to use comments section

O&M VerificationChecklistMay be used for 45-Day inspections; willhaveto use “Comments” section


Thank you

Thank you!

Laura Prickett, AICP, CPESC

EOA, Inc.

510.832.2852 x 123

[email protected]


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