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23_10_16_1339 Background Record Materials
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23_10_16_1339 Background Record Materials
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Last modified
10/16/2023 3:12:15 PM
Creation date
10/16/2023 3:10:51 PM
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PDD_Planning_Development
File Type
MA
File Year
23
File Sequence Number
5
Application Name
River Road-Santa Clara Neighborhood Plan
Document Type
Misc.
Document_Date
10/16/2023
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Yes
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Teri Higgins <br />June 30, 2016 <br />Page 11 <br />2.Existing Sewers <br />a.Sewers in Non‐Liquefiable Areas. Pipe joints may crack due to shaking. Pipeline collapse <br />will be limited. Continue to slip‐line sewers if required for other reasons. It will reduce <br />the potential for cracking and infiltration following an earthquake. <br />b.Sewers in Low Probability Liquefiable Areas (0 – 5% probability and PGDs of 4‐inches or <br />less). These areas are found along the Willamette River. If liquefaction occurs, there will <br />be some pipeline damage, although the probability is small. For critical (large diameter <br />pipes 24‐inches and larger) pipelines that are difficult to access for repair (e.g. river <br />crossings), consider slip lining them to hold the pipe segments together. Products such <br />as those available from Insituform (polyester liner) should be adequate, although the <br />lining material has limited ductility. HDPE slip lining would be preferred as it is much <br />more ductile. <br />c.Sewers in Moderate Probability Liquefiable Areas (5 ‐ 15% probability and PGDs greater <br />than 4 inches. These same areas are subject to landslides with a 15 – 30% probability of <br />occurrence and with PGDs potentially exceeding 100 inches. These areas are found in <br />the hills in southern Eugene. These pipelines are typically 12‐inches diameter or less <br />serving small areas. It is difficult to mitigate these sewers if large PGDs occur. Slip lining <br />the system with HDPE would have the greatest likelihood of success, but even that may <br />be limited. Make sure that damaged sewers can overflow to the River without backing <br />up buildings or overflowing into the streets. <br />3.New Sewers <br />a.Sewers in Non‐liquefiable areas. Use pipe with joints that can accommodate small <br />differential movements (less than ½”) without cracking. Standard bell and spigot pipe <br />with rubber gaskets is acceptable. Pipe materials can include concrete, vitrified clay, and <br />PVC. <br />b.Critical Sewers (24‐inch and larger) in Low Probability Liquefiable Areas (0 – 5% <br />probability and PGDs of 4‐inches or less). These areas are found along the Willamette <br />River. Design the pipe to be neutrally buoyant so if the surrounding soil liquefies, it <br />won’t float. Use specially designed pipe with double depth bells to limit joint pull‐out of <br />segmented pipe. HDPE, reinforced concrete, steel, or ductile iron pipe is required. For <br />difficult to access locations (e.g. river crossings) use continuous or restrained joint pipe <br />such as HDPE, steel with welded joints, or ductile iron with restrained joints. <br />c.Non‐Critical Sewers (less than 24‐inch diameter) ‐ Low Probability Liquefiable Areas (0 – <br />5% probability and PGDs of 4‐inches or less). These areas are found along the <br />Willamette River. It is preferred but not required to design the pipe to be neutrally <br />2020 Eugene Wastewater Master Plan Appendix A-11
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