The following principal uses are permitted in an A district:

    A.    On a building site, one one-family dwelling or one-family mobilehome either constructed after September 15, 1971, and issued an insignia of approval by the California Department of Housing and Community Development and permanently located on a permanent foundation system, or constructed after July 15, 1976, and issued an insignia of approval by the U.S. Department of Housing and Urban Development and permanently located on a foundation system;

    B.    Crop, vine or tree farm, truck garden, plant nursery, greenhouse apiary, aviary, hatchery, horticulture;

    C.    Raising or keeping of poultry, fowl, rabbits, sheep or goats or similar animals;

    D.    Grazing, breeding or training of horses or cattle;

    E.    Winery or olive oil mill;

    F.    Fish hatcheries and rearing ponds;

    G.    Public or private riding or hiking trails;

    H.    One secondary dwelling unit per building site on parcels twenty-five (25) acres in size or larger that are zoned for not more than one dwelling and have one but no more than one dwelling unit on the parcel subject to the following requirements:

    1.    The secondary dwelling unit shall be on the same building envelope as the primary unit;

    2.    On parcels less than one hundred (100) acres, the secondary dwelling unit shall be no larger than two thousand (2,000) square feet in area; on parcels one hundred (100) acres or larger the secondary dwelling unit shall be no larger than two thousand five hundred (2,500) square feet in area;

    3.    The secondary dwelling unit shall be subject to site development review pursuant to Section 17.54.210 et seq.; and

    4.    The secondary dwelling unit shall be subject to and consistent with the provisions of the county policy on secondary dwelling units in agricultural and rural residential areas.

    I.    Occupancy of agricultural caretaker dwelling(s) subject to a site development review as provided in Section 17.06.090, when found by the planning director to be necessary to provide housing for the agricultural caretaker and his/her family.

    Notwithstanding the requirements of Section 17.54.220, for secondary units on parcels that are less than one hundred (100) acres in size, the planning commission shall decide applications for site development review under this section, and a public hearing is required. (Ord. 2003-47 § 1; Ord. 99-2 § 1; Ord. 93-33 § 2 (part); prior gen. code § 8-25.2)