Table I.

MINIMUM LINER DESIGN STANDARDS

		Minimum Field
Liner Material	Function	Thickness (Units as Specified)	Liner Density (Tests as Specified)	Remarks
Geosynthetic	Liner, Cap	30 mil 30 mil	NA	1. A greater thickness may be required depending upon the recommendations of the manufacturer. 2. HDPE liners shall be at least 60 mil.
Natural & Remolded Clay	Liner, Cap Composite Component	2 feet 1 foot 2 feet	90%* 90%* ›=90%*	1. Minimum of 30% fines by weight less than 0.074 mm particle size (#200 sieve). 2. Plasticity index. 3. No coarse fragments greater than 3/4 inch in diameter.
Sodium Bentonite & Bentonite- like materials	Liner, Cap Composite Component	1 foot 1 foot 1 foot	›=90%* ›=90%* ›=90%*	1. Minimum of 8% powdered sodium bentonite or manufacturer’s recommendations, whichever is greater. 2. No coarse fragments greater than 3/4 inch in diameter. 3. No organic matter.
Geosynthetic Clay liner (GCL)	Composite Component	N/A	N/A	Minimum of 3/4 pound of powdered or granular sodium bentonite per square foot.

*Percentage is of maximum theoretical density when using Marshall method of design, and percentage of maximum when using Standard Proctor method of design (Pa. PTM No. 106, Method B).

Source

The provisions of this § 277.255 amended December 22, 2000, effective December 23, 2000, 30 Pa.B. 6685. Immediately preceding text appears at serial pages (226305) to (226307).

Cross References

This section cited in 25 Pa. Code § 277.161 (relating to liner system and leachate control plan); 25 Pa. Code § 277.164 (relating to application requirements for noncoal mine disposal); 25 Pa. Code § 277.233 (relating to final cover and grading); 25 Pa. Code § 277.251 (relating to scope and requirements); and 25 Pa. Code § 277.258 (relating to surface mined areas).