In addition to the authority provided in Section 4516.5, the Counties of Marin, Monterey, San Mateo, Santa Clara, and Santa Cruz may recommend that the board adopt additional rules and regulations for the content of timber harvesting plans and the conduct of timber operations which provide a requirement that each timber harvesting plan contain a description of all log hauling routes, a statement of whether an encroachment permit is required by any public agency, and a requirement that no timber harvesting plan be approved by the director without the condition that the timber operator secure all required encroachment permits prior to commencement of timber operations.