§ 277.252. General limitations.
(a) The bottom of the subbase of the liner system cannot be in contact with the seasonal high water table or perched water table without the use of groundwater pumping systems.
(1) Soil mottling may indicate the presence of a seasonal high groundwater table.
(2) Drainage systems may be utilized to prevent contact between the bottom of the subbase of the liner system and the seasonal high water table or perched water table. The operator may not use a drainage system if the system is likely to adversely affect the quality or quantity of water provided by public or private water supply, even if a replacement supply is available under § 277.245 (relating to water supply replacement). The drainage system shall be limited to drain tile, piping and french drains.
(b) At least 8 feet shall be maintained between the bottom of the subbase of the liner system and the regional groundwater table in an unconfined aquifer. The regional groundwater table may not be artificially lowered.
(c) In a confined aquifer, at least 8 feet shall be maintained between the bottom of the subbase of the liner system and the top of the confining layer or the shallowest level below the bottom of the subbase where groundwater occurs as a result of upward leakage from natural or preexisting causes. The integrity of the confining layer may not be compromised by excavation.
(d) If the approved design plans provide for the placement of additional adjacent liner:
(1) Waste may not be placed within 25 feet of an edge of the liner.
(2) The edge of the liner shall be protected by soil cover, or another material approved in the permit, until additional liner is added.
(3) A lined berm at least 4 feet high shall be constructed and maintained to prevent the lateral escape of leachate.
(4) Adequate spacing shall be maintained on the inside of the berm to collect stormwater and sediment.
(e) If the approved design plans do not provide for the placement of additional adjacent liner, waste may not be placed within 15 feet of the inside top of the lined perimeter berm.
(f) A lined perimeter berm at least 4 feet high shall be constructed and maintained along the edge of the lined disposal area to prevent the lateral escape of leachate.
(g) The edge of the liner shall be clearly marked.
Source The provisions of this § 277.252 amended December 22, 2000, effective December 23, 2000, 30 Pa.B. 6685. Immediately preceding text appears at serial pages (266302) to (226303).
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 § 277.251 (relating to scope and requirements); 25 Pa. Code § 277.259 (relating to noncoal mine disposal); and 25 Pa. Code § 277.271 (relating to scope).
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