For the purpose of this subchapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
CARBONATE ROCK. Rock types that are affected by dissolution weathering process caused by slightly acidic groundwater. The most common types of rock that are categorized as carbonate rock are limestone (calcium carbonate) and dolomite (calcium magnesium carbonate).
CAVERN. Interconnected solution features within the bedrock surface.
CLAY LINER. Fine grained soil that is used in the construction of a liner that limits the rate of surface water intrusion into the subsurface.
CLOSED DEPRESSION. A bowl-shaped depression in the land surface characterized by internal drainage. A ghost lake is a closed depression which has visible standing water after a heavy rainfall event.
DISSOLUTION WEATHERING. The removal of soluble materials from intact carbonate rock by slightly acidic groundwater.
FAULT. A fracture in bedrock along which movement has taken place.
FINE GRAINED SOIL. Materials that predominantly consist of silt and clay-sized particles.
HAZARDOUS MATERIALS (CHEMICAL OR BIO-HAZARD). As defined and regulated by the Pennsylvania DEP or EPA.
IMPERMEABLE LINERS. A liner system that prohibits the infiltration or surface water into the subsurface.
KARST. The terrain that results from the dissolution of carbonate rock.
KARST PROCESS. The dissolution of carbonate rock by slightly acidic groundwater.
LINEAMENTS. Aligned topographic features that locate faults and fractures.
RESIDUAL SOIL. Soils derived from the in-place weathering of the underlying bedrock.
SINKHOLE. Localized land surface subsidence or collapse due to karst processes. SINKHOLES are categorized as solution sinkholes, collapse sinkholes and subsidence sinkholes.
SPRING. Where water flows naturally out of the bedrock or the overlying soil mantle onto the land surface.
TOXIC AND/OR BIOLOGICAL OR CHEMICAL HAZARDOUS MATERIALS. Biological species or chemical compounds, which are deemed to be toxic or hazardous by the Pennsylvania Department of Environmental Protection.
(Ord. 214, passed 2-7-2005)