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U Observation: Inspect for the presence of pests which constitute a nuisance and/or threaten the survival of the grass or plants in the bio-retention area. O Maintenance Action: Apply pesticide to the minimum amount necessary to control pests. All application of pesticide is to be performed by a licensed professional pest control contractor trained in Integrated Pest Management(IPM)techniques. Frequency: Before each rainy season ❑ Observation: Inspect bio-retention inlet pipes and cobblestone dissipation pads for any obstructions, debris, litter,vegetation,etc. Nothing should obstruct the flow of water into the bio- retention area. O Maintenance Action: Remove obstructions,debris, litter,vegetation,etc. ❑ Observation: Inspect bank of the bio-retention area. Look for gullies,washouts, evidence of uncontrolled surface water flow or any other evidence of distress to the slope. O Maintenance Action: Repair bank by excavating gullies and replacing soil in its original configuration properly compacted. Ensure repair will not allow slope erosion again. ❑ Observation: Inspect adjacent infrastructure, such as retaining walls,curbs,sidewalks and pavement for signs of failure caused by water intrusion into the surrounding soil. This is a sign of poor drainage from the bio-retention area. O Maintenance Action: Determine the cause of the poor drainage and repair. Frequency: After first heavy rain ❑ Observation: Inspect the bio-retention area to determine whether the facility is draining properly. Look for standing water or soggy,saturated soil. Look for holes containing standing water that would permit mosquitoes. Water should drain from the bio-retention areas within 72 hours. After 72 hours,there should be no areas of standing water and bio-retention area should have drained evenly. O Maintenance Action: Determine the cause of the poor drainage and repair. Fill holes containing standing water with "sandy loam"soil mix. Tilling of"sandy loam"soil mix may be required. After several years,the soil medium may become impermeable because of silt deposition, in which case removal and replacement of the "sandy loam"soil mix and gravel will be required. 2009 Farallon Drive Page 4 San Leandro,Ca