13 2026 02 12 Crestmont CC Stormwater O and M Manual

5.1.3 Porous Pavement Systems All components of the porous asphalt pavement system should be inspected at least twice annually unless otherwise noted. The perforated HDPE underdrain system should be inspected for clogging and jet-cleaned as necessary to remove sediment. The porous asphalt layer should be inspected for clogging at least quarterly, and after each major rain event in excess of 2 inches, for signs of clogging, sediment build-up, and weed growth. Sediment be removed and jet-cleaned as necessary, in order to maintain adequate permeability for runoff to percolate into the storage bed below. The underdrain collection piping shall be inspected at least annually for any sediment or debris build-up, and shall be jet-vacuum cleaned if necessary. 5.2 Corrective Maintenance Measures Depending on many factors, such as the performance of preventative maintenance actions, weather, or unexpected incidents, corrective maintenance requirements may not be precisely anticipated. Corrective maintenance is required on an emergency or non-routine basis to correct problems or malfunctions and to restore the components of the stormwater management system to its intended operations and safe conditions. Standing water within the proposed basins more than 72 hours after a storm event has ended is a sign that there is inadequate infiltration and/or discharge through the outlet control structure is occurring. The outlet control structure orifice openings, soil media layer, and underdrain collection piping within bioretention basins shall be inspected for sediment build-up, clogging, or debris and corrected immediately. The outlet control structure and sand layer within infiltration basins shall be inspected sediment build-up, clogging, or debris and corrected immediately. Sediment, debris, and trash which threaten the discharge capacity and storage volume of a stormwater facility should be removed immediately and properly disposed of in a timely manner, Equipment and personnel must be available to perform the removal work on short notice. Disposal of debris, trash, sediments and other waste material should be done at suitable disposal/recycling sites and in compliance with all applicable local, state and federal waste regulations. The lack of an available disposal site should not delay the removal of trash, debris, and sediment. Temporary storage shall be utilized

with all applicable local, state and federal waste regulations. The lack of an available disposal site should not delay the removal of trash, debris, and sediment. Temporary storage shall be utilized until and approved disposal site is available. Structural damage to precast structures, pipes, and trash racks must be repaired promptly. Equipment, materials and personnel must be available to perform these repairs on short notice. The immediacy of the repairs will depend upon the nature of the damage and its effects on the 7