General Guidelines for all Tire Shred Fills (July 1997)

All tires shall be shredded such that the largest shred is the lessor of one quarter circle in shape or 0.6 m in length; and at least one sidewall shall be severed from the tire shred

Tire shreds shall be free of contaminants such as oil, grease, gasoline, diesel fuel, etc., that could create a fire hazard

In no case shall the tire shreds contain the remains of tires that have been subjected to a fire

Class I Fills (< 1 m thick)

Class II Fills (1-3 m thick)

Maximum of 50% (by weight) passing
38-mm sieve

Maximum of 25% (by weight) passing
38-mm sieve

Maximum of 5% (by weight) passing
4.75-mm sieve

Maximum of 1% (by weight) passing
4.75-mm sieve

Tire shreds shall be free from fragments of wood, wood chips, and other fibrous organic matter

The tire shreds shall have less than 1% (by weight) of metal fragments that are not at least partially encased in rubber

Metal fragments that are partially encased in rubber shall protrude no more than 25 mm from the cut edge of the tire shred on 75% of the pieces and no more than 50 mm on 100% of the pieces

Infiltration of water into the tire shred fill shall be minimized

Infiltration of air into the tire shred fill shall be minimized

No direct contact between tire shreds and soil containing organic matter, such as topsoil

Tire chips should be separated from the surrounding soil with a geotextile

Use of drainage features located at the bottom of the fill that could provide free access to air should be avoided