Cal. Fish & Game Code § 9050

A spade, shovel, hoe, rake, or other appliance operated by hand may be used to take mollusks, sand crabs, and shrimps in Districts 1, 112, 2, 212, 3, 312, 4, 418, 434, 6, 7, 8, 9, 10, 11, 12, 13, 16, 17, 18, 19, 19A, 20, 20A, and 21, except as specified in Section 7332, except that freshwater clams shall not be taken by means of any of those appliances on any levee or on the berm of any levee.