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Table of Contents <br /> C. BMP Operation and Maintenance Plan <br /> Function of Bio-Retention Area 1 <br /> II. BMP Operation and Maintenance Checklists 2 <br /> II.A Storm Drain System Operation and Maintenance Checklist 2 <br /> II.B Parking and Landscape Areas General Operation and Maintenance Checklist 2 <br /> II.0 Bio-Retention Area General Operation and Maintenance Checklist 3 <br /> II.D Bio-Retention Area Subdrain Operation and Maintenance Checklist 5 <br /> III. Storm Water BMP Inspection and Maintenance Log 6 <br /> Maps <br /> C.3 Storm Water Control Plan Exhibit B <br /> I. Function of Bio-Retention Area <br /> The bio-retention area functions as a soil and plant-based filtration device that removes pollutants <br /> through a variety of physical, biological,and chemical treatment processes. The bio-retention area <br /> consists of a vegetated surface, "sandy loam"soil mix, ponding area,organic layer or mulch layer, <br /> storage layer,and under drain system. The runoff's velocity is reduced by being distributed evenly along <br /> a ponding area,and by interacting with the soil medium,vegetation,and soil microbes,as it passes <br /> through to the storage layer. Exfiltration of the stored water from the bio-retention area's storage layer <br /> into the under drain system occurs over a period of time (after significant storm events). The water is <br /> subsequently conveyed to the public storm drain system. <br /> See attached checklists for detailed observation and maintenance actions with recommended <br /> inspection times and activities. <br /> 2009 Farallon Drive Page 1 San Leandro,Ca <br />