In every auto trailer camp where automobiles or trailers are washed or are to be washed, there shall be installed a wash rack and no such washing shall be done except on such wash rack. All such wash racks shall be paved with a continuous concrete floor slab not less than fifteen feet by twenty-five feet by four inches thick and all parts thereof shall slope toward a drain so connected as to dispose of all waste water without nuisance or creation of an unsanitary condition.
(1967 Code §21-40)