203 - Removing Drainage Structures, Culverts, and Sewers
When removing or abandoning a drainage structure, any live sewers connected to them will be rebuilt and properly connected through the removal area.
Service must be maintained during these construction operations.
When removal of the drainage structure is called for, the cover should be removed and the structure should be removed entirely.
Where abandoning of the drainage structure is called for, the cover should be removed and the structure should be broken down to an elevation at least 3 feet (1 m) below the final pavement surface or at least 3 feet (1 m) below the final ground elevation.
When a culvert pipe and/or sewer pipe is to be removed, the culvert pipe and/or sewer pipe (and end treatments) are to be completely removed.
When existing pipe is to be extended, only those portions of the existing pipe needed to make a proper connection will be removed.
All pipe to be abandoned is to be bulkheaded with Grade P2 or S3 concrete or with brick/block masonry. See subsection 402.03 of the Standard Specifications for Construction.
The bulkhead should extend from the inner wall of the drainage structure at least 1 foot (0.3 m) into the pipe.
Any pipe with a top elevation within 5 feet (1.5 m) of the top of the pavement will be reviewed for removal.