Pennsylvania Surface Impoundments regulations & environmental compliance analysis

Pennsylvania Surface Impoundments: What you need to know

Governing Law and Regulations

Hazardous waste surface impoundment rules: 25 Pennsylvania Code (Pa. Code) 264a.1(a) and 25 Pa. Code 264a.221; 25 Pa. Code 265a.1(a) (interim status)

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Federal organic air emissions standards: 25 Pa. Code 264a.1(a) (interim status)

Design standards:

Surface impoundment liners: 25 Pa. Code 264a.221

Regulatory Agency

Pennsylvania Department of Environmental Protection (DEP) Office of Waste, Air, Radiation and Remediation Management Bureau of Waste Management Division of Hazardous Waste Management Hazardous Waste Program

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Pennsylvania's surface impoundment rules incorporate by reference the federal rules and more stringent state design requirements for liners. Surface impoundment owners and operators must also comply with state permit rules that are more stringent than their federal counterparts.

Administration and enforcement. DEP's Division of Hazardous Waste Management administers and enforces the surface impoundment rules in Pennsylvania.

State Requirements



25 Pa. Code 264a.221

For permitted facilities, a minimum distance of 4 feet must be maintained between the bottom of the liner and the seasonal high water table without the use of artificial or man-made groundwater drainage or dewatering systems. (Soil mottling may indicate the presence of a seasonal high groundwater table.) The distance between the top of the sub-base and the regional water table must be at least 8 feet (25 Pa. Code 264a.221(1)). DEP may grant a variance from this requirement upon written application in accordance with 25 ...

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