07/22/1974 Meeting - Laserfiche WebLink

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I . _ ~....... r .. b;;' . , .. ri.~~.; ....,; . 0- _ ""Publ~c Works Director expJ.ained that, t,he "liner" insertion ;into sewer lines iwas a process used primarily in larger pipes - 18 to 24" - and was recomme~ded \ . :for this project (8" pipe) more or less as an experiment. He said the sewer <TV inspection was an observation program in existence for about eight years to ~ provide information with regard to possible use of the liner. Monitoring and pictures of the 16th Avenue line have occurred on three occasions and revealed ino doubt about its deterioration and need for replacement. Having that infor- i !mation, he said, the city has a legal liability if the line is not replaced. ' 'He expressed concern about the revenues picture; the work was being financed by \ ,the 1962 bond issue which was rapidly being depleted. Public Wbrks was in the ilast ph?se of a program involving millions of dollars on separation of storm 'and sanitary sewers, he said, after which it was understood reconstruction and lrehabilitation of sewer lines would take place. Trees become involved in lreconstruction programs and in some newly annexed areas where sewers are ;installed, but Public Works had a good "batting average" where sewers had been !laid adjacent to trees. He commented on the problem of antagonizing people ' jwhen trees are removed for lines behind the curb, and from others for tearing ~ \ :up the pavement when lines are installed in the street. And on this particular project (16th Avenue), he said, if it is decided to replace the line in tbe street, it would be one of the better concrete" streets in the city to be torn up and impossible to replace in "like new" condition. i Parks Director commented on the general street plan which calls for saving r the trees if possible; if they can't be saved, then the'general rule is to replace with something equal or better. However, because of differing types __ of trees; streets, neighborhoods, etc., it is better to determine the best course of action on an individual basis. In cases of large, mature trees - ' maples, for instance - going into the street with a sew~r line might be , justified because of the cost of replacing the trees. But, he said, in ; making a determination it should be remembered that any tree at some time is igOing to have to be replaced because of age, disease, hazard to general 'public, I etc. If the trees are hawthornes, waiting for fall weather and carefully I , pruning would lessen the risk of loss. However, with the replacement program t ~ of planting something similar that is equal to or better than those taken out, ;'; the same effect would be created within a couple of years. He thougJrt;that if the;' overall situation was considered, problems involved ~th both placement of jsewers ,and trees COU1..d.. b..e .c.orr.e..cted as the. pr..og.ram progressed, recognizing that / some r~sk would ,have to be taken. He added that some of the street trees "..,~.J ihave"been undesirable and""therepJacement policy"woula-in2V 'years or so pr~ imore beneficial to the community. I ' I ~!Councilman Williams asked whether the concrete tile used in recent years would thave the same life span as the clay tile (estimated about 50 years) used in ;older installations, and how many miles 'of clay tile there were to be replaced. , !public Works Director estimated the life span for concrete tile at 50/75 years. I ,He added that the 50-year life span for the clay tile used in Eugene might be i ~ ~an overstatement because a great deal of it was ~eject material and th~ life \ .., ,expectancy would vary in some cases because of d~fferent types of clean~ng \ 'processes used over the years. He had no mileage figures on the amount of clay , :tile sewer installations. The inspection program had done nothing more, he said, \ than to give priority to those lines in advanced stages of deterioration. He \ ,added that the 16th Avenue project was determined the number one priority in 1962 and,because its use was continued with minor adjustments, its condition at \ this time was horrendous. He agreed with Mr. Williams' statement that regardless I of what was done with the clay tile there would probably have.to be eventual i replacement of the concrete tile on a 50 to 75-year cycle. In answer to : 'Councilman Murray, Public Works Director said the city switched to concrete pipe I :installations in the early' 30s. I iIn answer to Councilman Murray's request for clarification of statement with I I regard to lessening the risk of damage to trees if they were pruned in the i :fall, Parks Director said by so doing there would be a 75% chance they would I live through the sewer replacement project. He added, however, that if it was Ii 'decided to replace the sewer in the street there would be the same risk because . ~of new laterals and house connections. Regardless of where lines are located I lin almost every situation in town there would be some disturbance to the street ! trees. That was complicated by the fact that sewer lines must be constructed to / ~ !grade, different from water or gas pressure lines which could be placed wherever. ., IlSo each situation would have to be analyzed, depending upon the type of tree. I !jStill in answer to Mr. Murray, Parks Director said there had been no analysis I i.jof replacement trees on the 16th Avenue project if one were to die - it would , '4epend on what would be desirable for the ~treet when considered with what was i across the street, in the neighborhood, adpining block, etc. However, the ' J;,~pl~celTlent.s within !,~ve y?,a!,f?. "~C?.l.1:J._c1_ be"of t~e same size and ,shape, giving the 7/22/74 - 7 1bL