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7. BMP Maintenance Schedule Proper operation and maintenance of Stormwater Management Facilities will be the responsibility of the property owner in perpetuity. The applicant accepts responsibility for maintenance of stormwater management facilities until such responsibility is transferred to another entity. It is the responsibility of AutoZone and the facility management to provide for the regular maintenance of both structural and non - structural BMP's. AutoZone and store manager shall pass on this responsibility to successive owners /store managers to insure that the intent of the Water Quality Management Plan is carried out for the entire life of the site. Non - structural BMP's shall be implemented per the Water Quality Management Plan. Structural BMP's shall be inspected at a minimum of every six months or less as required by City of Antioch to ensure that the BMP's are in compliance with the regulations set forth in the Water Quality Management Plan. Structural BMP's shall be cleaned and operational no later than October of each year before the start of the rainy season. Records shall be kept on site indicating when maintenance has been performed on each structural or non - structural BMP. BMP maintenance records shall be made available to City of Antioch officials upon request. Summary of Maintenance Requirements Bio- retentions remove pollutants as the runoff passes through sandy loam and open - graded gravel layers. A perforated pipe under drain conveys treated stormwater to the site storm drain system. Routine maintenance is needed to ensure that flow is unobstructed, that erosion is prevented, and that soils are held together by plant roots and are plants are biologically active. Typical routine maintenance consists of the following: • Inspect bio- retention for evidence of instability or erosion and correct as necessary. Clear any obstructions and remove any accumulation of sediment. Examine rock or other material used as a splash pad and replenish if necessary. • Inspect overflow inlets for signs of sediment build up or plugging. • Observe performance of engineering soil layers in the Bio-retention areas for uniform percolation throughout. If portions of the Bio-retention do not drain at the required 5 "/hour, the soil layers should be removed and replaced. Remove any debris or accumulations of sediment. • Examine the vegetation to ensure that it is healthy and dense enough to provide filtering and to protect soils from erosion. Replenish mulch as necessary, remove fallen leaves and debris, prune large shrubs or trees and mow turf areas. Confirm that irrigation is adequate and not excessive. Replace dead plants and remove invasive vegetation. 5/1/2012 7