native material, crushed material, or other similar material. When crushed material is used, 100% of the material must be capable of passing through a 11/2" square sieve opening and 90-100% of the material must be capable of passing through a 1" square sieve opening, provided, however, a de minimus variation shall not be a violation of this Part in an instance where the rail carrier has made a good faith effort to comply with the percentage requirements. Smaller crushed material is preferable. It should be used where drainage and durability issues do not arise. Material that is 3/4" or less in size is recommended for switching lead tracks.
spilled fuel oil, sand, posts, rocks, and other hazards or obstructions.
Ill. Admin. Code tit. 92, § 1546.20