Capital Improvement Program (continued)

Background (continued)

In 1999, MSD began an aggressive line cleaning and television inspection program wherein the District contractedwithoutsidecompaniestocleanthepipes withwaterunderhighpressureandthentosenda video camera(alsoknownasclosedcircuittelevisionorCCTVcamera)throughtheline.Thevideotapeshaveenabled the District to more accurately determine the condition of the lines and to prioritize necessary repairs. Each year 10% of the pipes will be cleaned and then inspected by CCTV cameras to maintain the efficient operation ofthecollection system.

TheDistrictdevelopedaproactivecost-effectiverehabilitationstrategywiththedevelopmentofthePipeRating Program.Piperatingisaproactiveplanningtool,whichutilizesClosedCircuitTelevision(CCTV)information,GIS database,andactualmaintenancehistorytoview,rate,andcomputer-scorepipesegmentsbasedonanumber offactors.Thesefactors,manhole-to-manhole,includeworkorderhistory,numberandseverity ofdefects,and record overflows on that segment, which are combined to yield a numerical rating used to prioritize efforts.

Staff recently updated the District’s Pipe Rating Program to include additional parameters over previous versions. Each line project now has an objective numerical rating based upon overflow history, structural issues, customer service requests, and impacts to surface waters. This rating is then used to objectively prioritize collection systemprojects within theCIP eachfiscalyear.

Pipe Rating minimizes costs by helping the District focus rehabilitation dollars where they are needed most, ratherthan the usualfull-scale replacement ofentire collectorlines.In recognition ofthis innovative program, theAssociation ofMetropolitan Sewerage Agencies (AMSA) awarded the Districtoneof only two 2003National EnvironmentalAchievementAwards.

WastewaterSystemMasterPlanning

 Facilities Plan—

The District completed an update to this Facilities Plan in 2015. This significant, comprehensive study examinedthevariousunitprocesseswithintheplant,withafocusonheadworks,biologicaltreatment alternatives, and the future regulatory requirement. After extensive research of various options, the PlanrecommendedPlantHeadworksImprovementsaddingnewgritremoval,afinescreeningsystem, storage for peak flows (using existing decommissioned digesters), and chemically enhanced primary clarification.