How will an operator determine if a pipeline can affect an HCA?
Appendix C of the rule provides guidance on factors an operator should consider in determining whether a pipeline can affect an HCA. An example is provided in the Appendix. The factors are: Potential physical pathways between the pipeline and the HCA. Terrain surrounding the pipeline. An operator should consider the contour of the land profile and if it could allow the liquid from a release to enter an HCA. An operator can obtain this information from topographical maps such as U.S. Geological Survey quadrangle maps. Drainage systems such as small streams and other smaller waterways that could serve as a conduit to an HCA. Crossing of farm tile fields. An operator should consider the possibility of a spillage in the field following the drain tile into a waterway. Crossing of roadways with ditches along the side. The ditches could carry a spillage to a waterway. Potential natural forces inherent in the area (flood zones, earthquakes, subsidence areas, etc.) The nature and characteristic
