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Bioretention Area Maintenance Plan Date of Inspection. <br />Property Address: 200 Twin Dolphin Treatment Measure No.: <br />Table 1 <br />Routine Maintenance Activities for Bioretention Areas <br />2 <br />Inspect bioretention area to ensure that it drains between <br />Monthly, or as needed after storm events <br />storms and within five days after rainfall. If ponded water does <br />not drain within five days, check if drains are clogged or <br />consider removing the surface biotreatment soil media and <br />replacing with the approved soil media, plants and mulch.' <br />3 <br />Inspect inlets for channels, soil exposure or other evidence of <br />Monthly, or as needed after storm events <br />erosion. Clear obstructions and remove sediment: <br />4 <br />Evaluate health of trees, shrubs and small plants. Remove and <br />Twice a year <br />replace all dead and diseased vegetation.' <br />S <br />Maintain vegetation and the irrigation system. Prune and weed <br />Before wet season begins, or as needed <br />to keep bioretention area neat and orderly in appearance. <br />6 <br />Inspect and, if needed, add mulch before the wet season <br />Before wet season begins, or as needed <br />begins. It is recommended that composted arbor mulch be <br />applied once a year to maintain a 3" depth of mulch over all <br />bare soil areas except within six inches of tree trunks.' <br />7 <br />Inspect bioretention area using the attached inspection <br />Monthly, or after large storm events, and <br />checklist. <br />after removal of accumulated debris or <br />material <br />II. Prohibitions <br />Do not use pesticides or other chemical applications to treat diseased plants, control weeds or removed <br />unwanted growth. Employ non -chemical controls (biological, physical and cultural controls) to treat a pest <br />problem. Prune plants properly and at the appropriate time of year. Provide adequate irrigation for <br />landscape plants. Do not over water. <br />III. Mosquito Abatement <br />Standing water should not remain in the treatment measures for more than five days, to prevent mosquito <br />generation. Should any mosquito issues arise, contact the San Mateo County Mosquito and Vector Control <br />District (SMCMVCD), as needed for assistance. Mosquito larvicides should be applied only when absolutely <br />necessary, as indicated by the SMCMVCD, and then only by a licensed professional or contractor. Contact <br />information for SMCMVCD is provided below. <br />San Mateo County Mosquito Vector Control District <br />1351 Rollins Road <br />Burlingame, CA 94010 <br />PH: (650) 344-8592 <br />FAX: (6S0) 344-3843 <br />Email: info@smcmvcd.org <br />IV. Inspections <br />' Plant lists, Specifications for Biotreatment Soil Media and Mulch and Supplier lists can be found here: <br />www. fIowstotaa .or revenIin-stormwater ollution witli-new•redevelopment/c-3-reyulated-pprojects/ <br />Page 2 <br />Bioretention area O&M Template <br />C-5 <br />ATTY/AGR.2023.051/Trammell Crow Company (200 Twin Dolphin - STMMA) (Page 20 of 25) <br />