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Frequency: When Bio-Retention Facility is substantially failing to perform <br /> (Estimated 15 years from installation) <br /> ❑ Observation: <br /> Bio-retention facility is failing to drain and/or discharging "dirty water" into public storm <br /> drain system. Minor maintenance activities have failed to rectify the problem. <br /> O Maintenance Action: <br /> Perform a thorough inspection of the bio-retention area by a licensed professional (i.e. <br /> landscape contractor, landscape architect, civil engineer,etc.) Replace the failed <br /> components and repair of the bio-retention facility to design specifications(per the Storm <br /> Water Control Plan). <br /> II.D Bio-Retention Area Subdrain Operation and Maintenance Checklist <br /> Frequency: Before each rainy season <br /> ❑ Observation: <br /> Inspect all subdrain cleanouts. Ensure that all cleanout caps are present. Look for <br /> obstructions, debris,trash,vegetation,etc.growing inside the subdrain or covering the <br /> cleanout. <br /> O Maintenance Action: <br /> Remove any obstructions,debris, litter,vegetation, etc. by hand if present at or near <br /> cleanout entrance. Flush with pressurized water if further down the pipe. Replace missing <br /> cleanout caps and secure to prevent unauthorized removal or accidental replacement. <br /> Frequency: After first heavy rain <br /> ❑ Observation: <br /> Inspect each subdrain where it enters the overflow catch basin within each bio-retention <br /> area and inspect for blockages. Ensure subdrain is clear. <br /> O Maintenance Action: <br /> Clean or flush the line with pressurized water to ensure flow, if subdrain is blocked or dirty. <br /> 2009 Farallon Drive Page 5 San Leandro,Ca <br />