To authorize where allowed by the applicable Shoreline Management Plan (SMP), the construction, repair and maintenance of private, non-commercial docks and boat lifts, boat houses and boat shelters, existing and new marine railways, bank stabilization, bulkheads or retainer walls, excavation, fish attractors, reefs, fishery enhancement, utility lines, overhead power and communication lines, structures associated with heat exchange coils, geothermal use, dry hydrants, debris removal, dock anchors, mooring structures, scientific measuring devices and surveys, piles and pile supported structures, construction and maintenance of boat ramps, buoys & signs, modifications to existing marinas, intake pipes for residential irrigation, intake structures and recreational swimming, beaches by the adjacent shoreline property owners, lessees or governmental agencies.