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defect in joints when the laterals were put together were probably leaking water. If those <br /> soils were sandy, Mr. Pasko opined that most of the surrounding trees were drinking <br /> water out of those laterals and had been doing so for some time. <br /> Mr. Culver referenced the permit information previously supplied to the PWETC for <br /> sewer services (September 2015) and advised that those numbers continued to increase. <br /> When televising city mains, Mr. Culver reported that they looked the short distance <br /> available into laterals, and when seeing an obvious root intrusion, those property owners <br /> were sent a standard courtesy letter alerting them to that observation. <br /> Mr. Pasko briefly reviewed some of the new inspection tools available in that ever- <br /> changing technology and ability for television inspections that can pan and tilt about 1' <br /> into the lateral. Also, if no root intrusions are observed, Mr. Pasko advised that a small <br /> crawler attached to the main robot can be deployed to move up the lateral into the home <br /> carried by a tether. <br /> If there are too many roots present or a sag, Mr. Pasko noted there is also technology for <br /> a mobile probe through the home's inside cleanout consisting of a low voltage probe to <br /> hit the pipe, then another section grounded to a sign post or fire hydrant to ground it and <br /> complete the circuit. Mr. Pasko advised that this allows the operator to measure how <br /> much current arrives at that ground from the probe and from the amount of current back <br /> estimate or calculate the amount of I & I that can go in. Mr. Pasko noted that this also <br /> provided a nice and repeatable measure from one year to the next. However, Mr. Pasko <br /> noted that it also depended on the operators on those cameras and their skill levels; again <br /> requiring ordinance parameters that clearly define potential problem areas and variables. <br /> At the request of Member Cihacek, Mr. Pasko confirmed that the contractors performing <br /> lining of mains and those lining laterals were two separate specialties with their <br /> equipment also radically different at this time. Mr. Pasko noted that lining of mains was <br /> becoming more common and specialized, and those contractors didn't want to stop that <br /> process to deal with laterals. Mr. Pasko advised that he had yet to see any contractor <br /> make lining laterals part of lining main lines. Mr. Pasko noted that it was more common <br /> to line the mains one year and return the next year to line laterals. <br /> In the City of Edina, Mr. Pasko reported that when they do street reconstruction, they will <br /> also rehabilitate or line laterals, but that is typically done by a different contractor while <br /> still allowing private owners to take advantage of a better rate for that contractor to do <br /> multiple linings once mobilized. In other words, as suggested by Member Cihacek, if the <br /> City of Roseville bid street reconstruction, and chose to bid laterals while the street was <br /> torn up, it made sense to do so, but otherwise there was no benefit to bidding them <br /> together. Mr. Pasko reiterated that he didn't see those technologies merging anytime <br /> soon; since those operating the joysticks differ. Mr. Pasko advised that the skill sets of <br /> most of those operators were amazing; with some of the best he'd observed having <br /> previously been drone pilots, and transferring those skills to this technique. <br /> Page 8 of 20 <br />