Attachment 09 Plans_changes2.pdf

This document is a plan modification notice from the Forest Service regarding changes to sanitary sewer line abandonment procedures at two sites.

Site 1 involves the removal of the easternmost existing manhole at Sanitary Sewer Line #1, located at approximately station 27+00 within the 19H camping spur. The work scope includes cutting, capping, and filling with flowable fill up to approximately station 25+25, where a new manhole (#11) will be installed. Additional work involves removal of existing sanitary infrastructure, ITS laterals, and yard lines.

Site 2 requires cutting and capping the existing sewer line with flowable fill, commencing approximately 5 feet west of manhole #10 and extending to approximately station 22+25 where the line meets an existing manhole in the creek. The sewer line will be abandoned in place rather than removed, along with the existing manhole at station 22+25 and the manhole located between station 22+25 and manhole #10. The modification also specifies removal of existing clean outs, laterals, waterlines, and yard hydrants. The change from removal to abandonment in place represents a significant shift in the project approach, with work to be completed using flowable fill for pipe abandonment rather than full extraction of infrastructure.