§ 255-34.   Regulations pertaining to steep slopes.
The following regulations shall apply on all land having a slope of 10% or more as delineated on a plan which meets the requirements of a preliminary plan as specified in Chapter 212, Subdivision and Land Development:
   A.   Every hereafter created by having an of at least 10%, but not more than 15%, shall have the minimum increased by a factor of 1.3 and shall not have impervious surfaces exceeding 30% of the as increased.
   B.   Every hereafter created by having an of at least 15%, but not more than 25%, shall have the minimum increased by a factor of 1.5 and shall not have impervious surfaces exceeding 20% of the as increased.
   C.   Every hereafter created by having an of at least 25% shall have the minimum increased by a factor of two and shall not have impervious surfaces exceeding 10% of the as increased.
   D.   All freestanding , and (with the exception of driveways and utilities when no other location is feasible) are prohibited on slopes of 35% or greater and are prohibited on slopes where the soil type is classified as “stony land, steep,” by that document entitled “Soil Survey Montgomery County Pennsylvania,” prepared by the United States Department of Agriculture, Soil Conservation Service, dated April 1967, copies of which are on file in the office of the Township Manager, Upper Dublin Township Building, 801 Loch Alsh Avenue, Fort Washington, Pennsylvania.