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26 - Repair Leaks Manhole Wall <br />In lieu of the plastering techniques described in rehabilitation method 24, each <br />defect may be individually repaired through use of non-shrink or flexible sealing <br />products. <br />27 - Seal Precast Manhole Joints <br />The precast joint between wall sections has deteriorated or is leaking. This <br />rehabilitation method addresses removal of the deteriorated sealing material and <br />replacement with non-shrink grout or other sealant. It may also include the use of <br />chemical gel sealants injected through the wall to effect a seal from the outside. <br />28 - Remove Manhole Steps and Seal Holes <br />If manhole steps aze sufficiently deteriorated to be unsafe, they should be <br />removed and not replaced. The holes left should be sealed with non-shrink grout <br />or other sealant. <br />29 - Replace Manhole Steps <br />Not used. <br />30 - Install New Manhole Bench and Channel <br />The bench has deteriorated, and in severe cases, is entirely broken or missing. <br />The solution is to break out the existing bench and rebuild it. <br />31 - Repair Leaks Manhole Bench <br />Defects exist on the bench but deterioration is insufficient to justify replacement. <br />This rehabilitation method addresses repair of leaks through the use of non-shrink <br />grout and/or other sealant materials. <br />32 - Rebuild Manhole Channel <br />The channel or invert of the manhole is severely broken or cracked. This <br />rehabilitation method addresses breaking out the existing channel and building a <br />new one. <br />ADS Environmental Services, Inc. <br />VI-14 <br />