Section 113.07 - Replacement of Cast-iron Pipe Adjacent to Parallel Excavations(1) Cast-iron pipe, eight inches or less in nominal diameter, that is adjacent to parallel excavation shall be replaced immediately, provided that the excavation exceeds eight feet in length and a condition exists as set forth in 220 CMR 113.07(2), (3) or (4).(2) A low-pressure cast-iron pipe that is parallel to a shallow trench excavation shall be replaced if: (a) the pipe is exposed and undermined; or(b) at least 1/2 of the pipe diameter lies within the angle of influence; and 1. the bottom of the excavation is below the water table; or2. the excavation is in soft clay.(3) A low-pressure cast-iron pipe that is parallel to a deep trench excavation and lies within the angle of influence shall be replaced if:(a) the pipe is exposed and undermined;(b) the pipe is totally, or in part, within three feet of the edge of the trench and sheeting that may have been used is not left in place; or(c) the operator determines that the strain on the pipe caused by, but not limited to, excessive ground movement or inadequate pipe support shall exceed 0.05% (500 microstrain).(4) A high-pressure cast-iron pipe that is parallel to a shallow or deep trench excavation shall be replaced if: (a) the pipe is exposed and undermined; or(b) at least 1/2 of the pipe diameter lies within the angle of influence and sheeting that may have been used is not left in place.(5) When cast-iron pipe is adjacent to a parallel excavation and must be replaced in accordance with 220 CMR 113.07, the pipe shall be surveyed daily for gas leakage and monitored daily until the pipe is replaced.(6) Any pipe that replaces cast-iron pipe shall extend a safe distance, determined by the operator, beyond the point where parallel excavation terminates.Amended by Mass Register Issue 1432, eff. 12/11/2020.