economically and efficiently, shall be made in conformity to the method outlined in paragraph "C", under heading 2-02 of these specifications. The side slopes of the fill shall be protected from wave and tide action by placing a layer of selected coral-rocks on the slope, which rock shall have a minimum size of one-half (1/24 cubic foot, and shall be so placed as to provide a minimum of volds, with the larger rock on the ocean side of the fill. The rock may be dumped from hauling equipment and spread into layers by bulldozers or other adequate equipment.