The buffer for nontidal wetlands with adjacent areas containing steep slopes or highly erodible soils shall be expanded to 100 feet. Nontidal Wetlands with Steep Slopes and Highly Erodible Soils. The following criteria may be used by the Department in designating nontidal wetlands with steep slopes or highly erodible soils: Slopes immediately adjacent to the nontidal wetlands in excess of 15 percent; or Soils adjacent to a nontidal wetland with an erodibility factor greater than 0.35 as determined by the Prince George's Soil Conservation District. Specific nontidal wetland sites with steep slopes and highly erodible soils identified by the Department shall be designated by regulation.