All single-family residential land-disturbing activities in steep slope protection areas, including but not limited to clearing, grading, excavation, building construction, construction of driveways and roads, cutting, and filling, shall be limited to the minimum steep slope protection area necessary to accommodate the proposed use or activity, and shall in no case be greater than 15,000 square feet of steep slope protection area disturbance per parcel, plus land necessary for driveway access, on-site wastewater treatment system, and stormwater management facilities.