25 Pa. Code § 89.35
The operation plan shall include a prediction of the probable hydrologic consequences of the proposed underground mining activities upon the quantity and quality of groundwater and surface water within the proposed permit, adjacent and general areas under seasonal flow conditions, and whether underground mining activities may result in contamination, diminution or interruption of any water supplies within the permit or adjacent area. The prediction shall be prepared by a qualified hydrologist or engineer. The probable hydrologic consequences determination shall emphasize the anticipated responses of groundwater and surface water flow, its rate, direction and quality and quantity to the proposed underground mining activities. The prediction shall be based on baseline data collected at the proposed mine site or data statistically representative of the site or a combination of both. The prediction required by this section may be developed using modeling techniques, but the Department may require verification of any models.
25 Pa. Code § 89.35
This section cited in 25 Pa. Code § 86.81 (relating to program services); and 25 Pa. Code § 89.34 (relating to hydrology).