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6.A. - Page 65 of 69 <br />Extended Detention Basin Maintenance Plan Date of Inspection: <br />Property Address: 515 Cleveland St. — 433 Harrison Ave. Treatment Measure No.: <br />Table 1 <br />Routine Maintenance Activities for Extended Detention Basins <br />6 <br />Remove accumulated sediment and regrade when the <br />Every 10 years, or as needed to <br />accumulated sediment volume exceeds 10% of basin volume <br />maintain 2in clearance below <br />and dispose of sediment properly. <br />low -flow orifice for HM design. <br />7 <br />Remove accumulated trash and debris from the extended <br />Twice a year (January and April) <br />detention basin at the middle and end of the wet season and <br />dispose of trash and debris properly. <br />8 <br />Irrigate during dry weather. <br />9 <br />Inspect extended detention basin using the attached inspection <br />Quarterly, or as needed <br />checklist. <br />II. Prohibitions <br />Do not use pesticides or other chemical applications to treat diseased plants, control weeds <br />or removed unwanted growth. Employ non -chemical controls (biological, physical and <br />cultural controls) to treat a pest problem. Prune plants properly and at the appropriate time <br />of year. Provide adequate irrigation for landscape plants. Do not over water. <br />Ill. Mosquito Abatement Contact Information <br />Standing water shall not remain in the treatment measures for more than five days, to prevent <br />mosquito generation. Should any mosquito issues arise, contact the San Mateo County <br />Mosquito Abatement District (SMCMAD), as needed for assistance. Mosquito larvicides shall <br />be applied only when absolutely necessary, as indicated by the SMCMAD, and then only by a <br />licensed professional or contractor. Contact information for SMCMAD is provided below. <br />San Mateo County Mosquito Abatement District <br />1351 Rollins Road <br />Burlingame, CA 94010 <br />PH: (650) 344-8592 <br />FAX: (650) 344-3843 <br />Email: infoa-smcmad.orq <br />IV. Inspections <br />The attached Extended Detention Basin Inspection and Maintenance Checklist shall be used to <br />conduct inspections monthly (or as needed), identify needed maintenance, and record <br />maintenance that is conducted. <br />Page 9 of 13 <br />ATTYIAGR12019.2031515 CLEVELAND - STMMA EXHIBIT C <br />REV: 07-25-19 DZ <br />