Encroachments permitted under this chapter shall be removed immediately after cancellation or expiration of the permit. Any encroachment not removed is declared to be a nuisance. Failure, neglect or refusal to remove any unauthorized encroachment within thirty days after notice by the city shall constitute an infraction punishable by a fine as set forth in California Government Code Section 36900, and as a cumulative remedy the city may remove such encroachment and collect the entire cost and expense thereof from the person responsible therefor, or by appropriate action in court may compel removal or abatement of the encroachment and such reasonable attorney fees as may be fixed by the court. (Ord. 1209 NCS §3 (part), 1976.)