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REVISED EXHIBIT "C" <br />Stormwater Treatment Operation and <br />Maintenance Inspection Report <br />Bioretention Area Maintenance <br />Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, <br />which reduces pollutant removal efficiency and may lead to bioretention area failure. <br />Routine maintenance activities, and the frequency at which they will be conducted, <br />are shown in Table 1. <br />Table 1 <br />Routine Maintenance Activities for Bioretention <br />Areas <br />No. <br />Maintenance <br />Frequency of Task <br />Task <br />1 <br />Remove obstructions, debris and trash from bioretention <br />Monthly, or as needed after storm <br />area and dispose of properly. <br />events <br />2 <br />Inspect bioretention area to ensure that it drains between <br />Monthly, or as needed after storm <br />storms and within five days after rainfall. If ponded water <br />events <br />does not drain within five days, check if drains are <br />clogged or consider removing the surface biotreatment <br />soil and replacing with the approved soil mix and replant <br />3 <br />Inspect inlets for channels, soil exposure or other <br />Monthly, or as needed after storm <br />evidence of erosion. Clear obstructions and remove <br />events <br />sediment. <br />4 <br />Remove and replace all dead and diseased vegetation. <br />Twice a year <br />5 <br />Maintain vegetation and the irrigation system. Prune and <br />Before wet season begins, or as <br />weed to keep bioretention area neat and orderly in <br />needed <br />appearance. <br />6 <br />Inspect and, if needed, add mulch before the wet <br />Before wet season begins, or as <br />season begins. It is recommended that composted <br />needed <br />arbor mulch be applied once a year to maintain a 3" <br />depth of mulch over all bare soil areas except within <br />six inches of tree trunks. <br />7 <br />Inspect bioretention area using the attached <br />Monthly, or after large storm events, <br />inspection checklist. <br />and after removal of accumulated <br />debris or material <br />Prohibitions <br />Do not use pesticides or other chemical applications to treat diseased plants, control <br />weeds or removed unwanted growth. Employ non -chemical controls (biological, physical <br />and cultural controls) to treat a pest problem. Prune plants properly and at the <br />appropriate time of year. Provide adequate irrigation for landscape plants. Do not over <br />water. <br />Mosquito Abatement <br />Standing water should not remain in the treatment measures for more than five days, to <br />prevent mosquito generation. Should any mosquito issues arise, contact the San Mateo <br />Page 1 of 3 <br />ATN/AGR.2023/Amend.No.1/Steve and Doreen Werthmann Revocable Trust (1831 E Bayshore STMMA Amendment) (Page 9 of 11) <br />