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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.
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.
thank you

Thank you!

Laura Prickett, AICP, CPESC

EOA, Inc.

510.832.2852 x 123

Lprickett@eoainc.com