space. (8) Specific Plans, Historic Preservation Overlay Zones or Subdivision Approvals. Height limitations in Specific Plans, Historic Preservation Overlay Zones or in subdivision approvals shall take precedence over the requirements of this Section 12.21. Otherwise, this Section 12.21 shall apply. (e) Lot Coverage. Buildings and Structures extending more than 6 feet above natural ground level shall cover no more than 40% of the area of a Lot. (1) Lot Coverage on Substandard Lots. Notwithstanding Paragraph (e) above, for a Lot which is substandard as to width (less than 50 feet) and as to area (less than 5,000 square feet), Buildings and Structures shall cover no more than 45% of the area of a Lot. (2) Zoning Administrator’s Authority. A Zoning Administrator may grant limited deviations from these requirements, pursuant to the authority and procedures established in Subdivision 28. of Subsection X. of 5 Section 12.24 of this Code. (f) Grading. (Amended by Ord. No. 184,802, Eff. 3/17/17.) Notwithstanding any other provisions of this Code, total Grading (Cut and Fill) on a Lot shall be limited as outlined below. No Grading permits shall be issued until a Building permit is approved. (1) Maximum Grading Quantities. The cumulative quantity of Grading, or the total combined value of both Cut and Fill or incremental Cut and Fill, for any one property shall be limited to a base maximum of 1,000 cubic yards plus the numeric value equal to 10% of the total Lot size in cubic yards. Example: a 5,000 square-foot Lot would have a maximum Grading amount of 1,500 cubic yards (1,000 cubic yards for the base amount + 500 cubic yards for the 10% calculation). However, the cumulative quantity of Grading shall not exceed the maximum “by- right” Grading quantities outlined by Zone in Table 12.21 C.10-6 below. Table 12.21 C.10-6 Maximum “By-Right” Grading Quantities Table 12.21 C.10-6 Maximum “By-Right” Grading Quantities Zone Maximum Grading (cubic yards) R1 1,000 RS 2,200 RE9 2,400 RE11 2,800 RE15 3,200 RE20 4,000 RE40 6,600 RA 3,600 (2) Import/Export Limits. Earth import and export activities may take place only between the hours of 9:00 a.m. and 3:00 p.m., Monday through Friday. The maximum quantity of earth import or export shall be limited to the following quantities: (i) Lots Fronting on Standard Hillside Limited Streets or Larger.