(a) The construction or location of any single-family residential structures of nine or fewer dwelling units;

(b) The construction or location of any multifamily residential structures of 60 or fewer units located within the mixed housing/office (MHO), mixed commercial (MC), and general commercial (GC) downtown zoning districts and the R-18 multifamily zone;

(c) The construction of a barn, loafing shed, farm equipment storage building, produce storage or packing structure, or similar agricultural structure, covering 30,000 square feet, and to be used only by the property owner or his or her agent in the conduct of farming the property. This exemption shall not apply to feed lots;

(d) The construction of an office, school, commercial, recreational, service or storage building with 12,000 square feet of gross floor area, and with associated parking facilities designated for 40 automobiles;

(e) The construction of a parking lot designated for 40 automobiles;

(f) Any landfill or excavation of 500 cubic yards throughout the total lifetime of the fill or excavation; and any fill or excavation classified as a Class I, II, or III forest practice under RCW 76.09.050 or regulations thereunder; provided, that the categorical exemption threshold shall be 250 cubic yards for any fill or excavation that occurs on a site that contains critical areas as defined in Chapter 18.65 CMC and the Shoreline Master Program, as amended.