2016-02-23_PWETC_Minutes - Laserfiche WebLink

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inflatable ball where the city's line met the private lateral to prevent use of the main line beyond their lateral until the property owner chose to correct problem areas. Mr. Pasko reported other variables among communities: total subsidy for rehabilitation borne by the city, options for lower lateral rehabilitation by a city contractor only, and some of those done up to the wye, some to the edge of the road, and some up to the rights-of-way. Mr. Pasko noted that upper lateral lining was done by either using private or city contractors. Specific to Minnesota communities, Mr. Pasko provided a matrix of the options used by the Cities of Edina, Golden Valley, Shakopee, Hastings, and Rockford; and for comparison purposes, he included the City of Hampton Roads, VA in that matrix. Overall, Mr. Pasko opined that the most successful option he observed around the country was real estate transaction based, such as used by the City of Golden Valley, MN with point-of-sale inspections performed from within the home allowing a holistic viewpoint for both the upper and lower laterals. Mr. Pasko reported that some communities choose a dye or smoke test when possible. On the east coast, Mr. Pasko reported that over the last four years, they had experienced a turnover of homes at 10%to 15%, making those inspections a sustainable program, with the same home inspected periodically over a fifteen year period, and thereby compiling a database of information for the City's GIS system for comparison purposes. Mr. Pasko noted this was also possible for inspecting new homes being constructed annually and adding that data for future comparison purposes as well. Lower Lateral Tools Being Used: • "Top-hat" style liner with the potential that it may be unable to fully wrap the trunk sewer main and only able to extend <18" into the lateral pipe. Mr. Pasko noted further problems with this tool include the brim not always being wide enough to find its way through or around tree roots, causing communities to shy away from using it. • "Shorty" style liner that does fully wrap the trunk sewer main, and extends 1- 2' into the lateral pipe. • "Longer" style liner that fully wraps the trunk sewer main and extends >2' into the lateral pipe and can be done with or without installing cleanouts. Mr. Pasko reported that the City of Shakopee, MN currently uses this tool. When to Use Robotic Tools: • To prevent damage to a lateral liner, you must line the main line first • Any sharp main liner edges must be brushed to prevent tearing of the lateral liner What Tools are They Using? • Many communities use dig and replace in lower and upper laterals — depending on specific situations • Use of cleanouts vary among communities and depends on their location, whether above or below ground Page 4 of 20