In a C-1 district, the maximum impermeable surface coverage is 70 percent. The maximum hard surface coverage by all buildings, driveways, walkways and other similar hard surfaces shall be 80 percent. On properties that do not have suitable soils, as identified in the Preliminary Soils Report, the maximum impermeable coverage may be 80 percent. (Ord. 1347 § 36, 2016; Ord. 573 § 2, 1990).