Pennsylvania Code › Title 25 - ENVIRONMENTAL PROTECTION › Part I - Department of Environmental Protection › Subpart D - Environmental Health and Safety › Article IX - Residual Waste Management › Chapter 288 - RESIDUAL WASTE LANDFILLS › Subchapter F - ADDITIONAL REQUIREMENTS FOR CLASS III RESIDUAL WASTE LANDFILLS › ADDITIONAL OPERATING REQUIREMENTS-GENERAL › Appendix A

Current through Register Vol. 54, No. 28, July 13, 2024
TABLE I
MINIMUM LINER DESIGN STANDARDS
Liner Material
Function
Minimum Field Thickness
									 (Units as Specified)
Liner Density (Tests as
									 Specified)
Remarks
Geosynthetics
Primary or Secondary
									 Liner
30 mil
N/A
1. A greater thickness may be
									 required depending upon the recommendations of the manufacturer. HDPE liners
									 shall be at least 60 MIL.
Geosynthetics
Cap
30 mil
N/A
1. A greater thickness may be required depending upon the
									 recommendations of the manufacturer.
Natural & Remodeled Clay
Secondary
									 Liner, Cap, Composite Component
2 feet
2 feet
1 foot
[GREATER THAN EQUAL TO] 90%*
[GREATER THAN EQUAL TO] 90%*
[GREATER THAN EQUAL TO] 90%
*
1. Minimum of 30% fines by weight less than
										0.074 mm particle size (# 200 sieve).
2. Plasticity Index greater than or equal to
										10.3. No coarse fragments greater than 3/4 inch in diameter.
Sodium bentonite & Bentonite-like
									 materials/soil mixtures
Secondary Liner,
Cap, Composite
Component
2 feet
2 feet
1 foot
[GREATER THAN EQUAL TO] 90%*
[GREATER THAN EQUAL TO] 90%*
[GREATER THAN EQUAL TO] 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
1. Minimum of
									 3/4 pound of powdered or granular sodium bentonite per square foot.
* Percentage of maximum when using Standard Proctor
							 method of design (Pa. PTM No. 106, Method B).
Cross References
This table cited in 25 Pa. Code §
													288.434 (relating to secondary
							 liner); 25 Pa. Code §
													288.436 (relating to primary
							 liner); and 25 Pa. Code §
													288.439 (relating to surface mined
							 areas).
TABLE II
MINIMUM LINER DESIGN STANDARDS
Liner Material
Function
Minimum Field Thickness
									 (Units as Specified)
Liner Density (Tests as
									 Specified)
Remarks
Geosynthetics
Liner, Cap
30
									 mil
N/A
1. A greater thickness may be required depending upon
									 the recommendations of the manufacturer. HDPE liners shall be at least 60 MIL.
Natural & Remolded Clay
Cap,
									 Composite Component
2 feet
1 foot
[GREATER THAN EQUAL TO] 90%*
[GREATER THAN EQUAL TO] 90%*
1. Minimum of 30% fines by weight less than
										0.074 mm particle size (#200 sieve).
2. Plasticity Index greater than or equal to
										10. 3. No coarse fragments greater than 3/4 inch in diameter.
Sodium Bentonite and Bentonite-like materials
Cap, Composite Component
2 feet
1 foot
[GREATER THAN EQUAL TO] 90%*
[GREATER THAN EQUAL TO] 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
1. Minimum of
									 3/4 pound of powdered or granular sodium bentonite.
* Percentage of maximum when using Standard Proctor
							 method of design (Pa. PTM No. 106, Method B).
This table cited in 25 Pa. Code §
															288.234 (relating to final cover
								and grading); 25 Pa. Code §
															288.535 (relating to liner); and
								25 Pa. Code §
															288.538 (relating to surface mined
								areas).