N.J. Admin. Code § 7:14-2.13 - Excavation material unacceptable or conditionally acceptable for reuse as trench backfill

(a) The following trench excavation materials are unacceptable as trench backfill:

1. Any excavation materials that will cause damage to the piping systems;

2. Any excavation material that cannot be compacted or consolidated to yield the desired density as specified in the contract specifications;

3. Trees, stumps and foreign material.

(b) The following excavation materials are conditionally acceptable as trench backfill only if provided for in the contract specifications and the trench is located in a right-of-way, an easement, a roadway or an unimproved area:

1. Clay, organics and silt determined to be suitable in accordance with soil tests required by the owner/engineer.

2. Hard materials, such as blacktop, concrete, stone and rock.

i. The hard materials shall only be placed in the midzone of the trench beginning two feet above the top of the pipe, after compaction of the pipe envelope, to a point two feet below the final road or ground surface.

ii. Placement of the hard materials shall not create a potential hazard to the pipe or create voids that will cause adverse settlement.

iii. The maximum overall size of any piece of hard material shall be 12 inches.

(c) The Department may require that all trench backfill material not conforming to this subsection and contract specifications be removed and spoiled to a spoil site approved by the Department in accordance with the requirements of N.J.A.C. 7:26-1, for solid or hazardous wastes.

Notes

N.J. Admin. Code § 7:14-2.13

R.1984 d.339, effective 8/6/1984.
See: 16 New Jersey Register 1147(a), 16 New Jersey Register 2102(b).