When a Water Main Breaks Presentation to: AWWU Board of Directors November 5, 2014

Key Points Water Main Breaks Happen Frequently Have to Manage Service Levels – Large Diameter Pipe Failure – Tudor/Elmore – Small Diameter Breaks this Year Customers Expect Normal Service Levels

How We Manage Our Water Mains Large Diameter Pipes – Condition Assessment Small Diameter Pipes – Failure Prediction + Condition Assessment Field Response Critical to Good Customer Service

Twin Pits 30-inch Water Main Repair

Earthquake Forced the Issue? September 25, 2014

Following the earthquake… Teamwork

Finding the Leak Immediate Response - Leak Detection

Planning Steps Taken

30-inch Water Main Repair Initiated Repair (10’ from Vault) October 24/25, 2014

More Repair Activities Repair Clamp Unsuccessful – Outside Too Corroded – Seal Did not Hold

Final Touches on the Repair Abandoned Repair - 30” out of Service

Post Repair Activities Video – Confirmed Hole, Nothing Else

Important Next Steps Immediate Mitigation– Winter Worthy Temporary Service to APD Design to Rehab (Pipe In Service by May 2015) Additional Tasks (May Reduce Rehab Scope): New Methods for Analysis on Pipe Wall Thickness using Previous Data Evaluate Cathodic Protection for this Pipe

Recent Leak More Analysis…

How many breaks are too many? Middle Aged Pipe Will Break – Pressure Changes Will Result in Breaks – Replacement Costs Much Higher than Repair Retaining Level of Service Important – Eklutna Offline, Well 9 offline, 30” offline Operating within Normal Service Level

2014 Breaks and Outages

An Epidemic of Breaks, nope…

2014 Breaks Compared to Average

Questions? Water Main Breaks are Part of Doing Business Maintaining the level service our customers are used to is a Utility-wide effort Operating within Normal Service Level

Relative Impact of Breaks

Customer Impact by Pipe Size

Updated PVR

WDSRI – Our Level of Service Hasn’t Changed WDSRI measures and compares to recent past Number of Unplanned Outages Customer Hours of all Outages