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693 - Install Cured-in-Place Liner <br />A cured-in-place liner can be a long-term, cost effective rehabilitation alternative <br />to pipe replacement, especially for deep pipes and pipes under busy thoroughfares <br />or railroad tracks. However, collapses, severe offsets, and any other restrictions <br />must be repaired before the liner is installed. Typical cured liners are installed by <br />inflating with heated water under pressure until the liner is cured, and then re- <br />establishing the service connections. Typically, installation will require bypass <br />pumping to maintain system flows and avoid backup in upstream lines. This cost <br />is not included in the cost tables. <br />694 - Install Formed-in-Place Liner <br />This rehabilitation method is similaz to method 693 except the liner is at least <br />partially cured and requires only heat and pressure to reform it within the line. <br />695 - Slipline Entire Mainline Segment <br />Sliplining may consist of either inserting smaller diameter pipe into an existing <br />pipe if capacity is not a concern, or of pipe bursting followed by insertion of <br />similar or slightly larger size pipe. This rehabilitation method addresses only <br />inserting smaller diameter pipe into existing pipe. Any severe restrictions must <br />be repaired before sliplining is done. An access pit is constructed, usually at one <br />end of the segment, or at the location of a point repair to be made, if such exists. <br />696 - Replace Entire Mainline <br />T'his method is recommended if the structural integrity of the pipe is <br />compromised, or if point repairs to prepare a pipe for lining aze prohibitively <br />expensive. In unpaved areas, it is usually the most cost effective way to repair a <br />line with multiple defects. <br />ADS Environmental Services, Inc. <br />VI-22 <br />