Soft loadbearing materials.
Municipal Code of Chicago § 18-29-306.2.3
in effect18-29-306.2.3 Soft loadbearing materials.
If soft materials of poor loadbearing qualities are found at the bottom of the trench, stabilizing shall be achieved by overexcavating a minimum of two pipe diameters and backfilling to the installation level of the bottom of the pipe with fine gravel, crushed stone or a concrete foundation. The concrete foundation shall be bedded with sand tamped in place so as to provide uniform loadbearing support for the pipe between joints.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2690821Fetched: 10/24/2026
