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�.�� 6.5 Storm Drain Maintenance Storm drains and BMP's throughout the project will function best if the amount of sediment entering the system is kept to a minimum. The level terrain and cohesive soils at the project site result in a low erosion potential and will help to reduce the overall amount of sediment generated within the drainage area of the stormwater pond, particularly after landscaping has been established. Many of the routine BMP's implemented under the National Pollutant Discharge Elimination Systems (NPDES) permit for San Mateo County will work to reduce sediment production mobilization within the project. Among the most important will be: • Regular Street Sweeping. Regular street sweeping can have a significant impact on the control of such constituents of concern as trash and debris, particulates, and heavy metats. All onsite streets and parking areas will be swept on a regular basis to control the build-up of sediment and trash with particular attention to the early fall period prior to the onset of the winter rainy season. Street Sweeping schedules will follow City standards, but will not be less than monthly in the dry season. • lnlet and Catch Basin Cleaning. Stormwater inlets and catch basins can function as effective sediment traps for heavier materials. Therefore, these structures will need to be maintained and cleaned on at least an annual basis. Typical maintenance schedules for these activities include a tharough inspection and cleaning in late summer or early fall and a mid-winter inspection to identify any new problems that may have arisen. 6.6 AAedia Filtration Systems • Periodically, pollutants that are filtered by the Media Filter must be removed to restore the filter to its full efficiency and effectiveness. • The filtration system is typically designed for a one year maintenance cycle. • Cartridges are emptied, washed, and refurbished for reuse. • Maintenance will be arranged with the manufacturer to guarantee an effective treatment system. 6.7 Flow-Through Planters The planters must be regularly maintained to insure that they continue to be effective and do not cause floading or other harmful nuisances to the project. The following is a description of post- development maintenance requirements: • Inspect planters at least twice annually for clogging, sediment and debris accumulation preferably at the end of the wet season to schedule summer maintenance and before 16 BKF Job No.20070073 K:\MAIN\2007\070073\06 Design\C Storm Drain System\SWMP\2011-11-04\333_MAIN_SWMP.doc ATTY/AGR.2014.028/333 Main Street Stormwater Agreement