Timber Harvest In Pennsylvania, all earth disturbance activities must be undertaken in accordance with the Department of Environmental Protection’s (DEP) Chapter 102 Erosion and Sediment Control regulations adopted under the authority of the Clean Streams Law. Under these regulations, all earth moving or earth disturbance activities in Special Protection Watersheds, including timber harvesting activities, must have an Erosion and Sediment Control Plan developed, implemented and maintained to minimize accelerated erosion and resulting sedimentation to the waters of the Commonwealth. Timber harvesting is considered an earth disturbance activity because it disturbs the forest floor and exposes soils to accelerated erosion. While the felling of trees itself does not cause problems, the activities involved in moving the product from the stump to the mill may cause erosion and sediment pollution. Timber harvesting operations that will disturb 25 or more acres require a permit from DEP (the earth disturbance area is the total area of haul roads, landings, and skid trails). Inquiries as to whether or not a permit is required should be addressed to the local county conservation district or DEP Regional Office.