2015-10-27_PWETC_Minutes - Laserfiche WebLink

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• Average repair costs run at approximately $3,000 depending on where a leak is located; • Frozen services generally are rare and we their location known when a recurring problem and found early on. However, in 2014 the city experienced 165 frozen services; a problem found state-wide due to low temperatures for an extended period of time compounded by minimal snow cover. Mr. Culver noted that the typical frost line is at a depth of 3' — 4', and with the depth of a typical water line at 7' — 7.5', there should be no freezing problems. City infrastructure water service problems: • On average since 1999 the city experiences 29 water main breaks/year • However, in 2014 the city experienced 49 water main breaks Mr. Culver provided some photos of cracked water mains; reviewed how they were repaired; and results when fixed. As part of their initial research on service ownership, Mr. Culver reported that staff did a survey of colleagues in other cities and ownership between public and private lines. Of the 42 responses, Mr. Culver reported that only 4 reported anything different than public ownership and maintenance of the main while some had distinctions on ownership of the wyes with some covered by the city up to the right- of-way line. With the water main line, Mr. Culver reported that came out about 50/50 with some covering ownership and maintenance up to the curb stop and others consisting of private ownership all the way to the main. Mr. Culver advised he would bring some actual physical examples of various components and connections for next month's discussion. As noted during the sanitary sewer presentation to the PWETC, Mr. Culver noted the National League of Cities service line warranty program for both water and sewer service lines previously alluded to, that included frozen lines, and upon further examination may be an option for homeowners. For next month's presentation, Chair Stenlund asked staff to include climate resilience information and if climate change is changing (e.g. insurance rates); how water service interruption could be avoided during a climate crisis; service life for copper mains in Roseville's typical clay soil versus sandy soils that may inform homeowners on a line's life expectancy and/or depth; and ground water pumping and if and when still used beyond for cooling purposes or dumped without any other benefits. Mr. Culver clarified that in Roseville, the only groundwater pump used is for the fire station and skating center's geothermal system that was all recycled. Mr. Culver noted that the only water used by the City is surface water purchased from Page 16 of 18