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I. Routine Maintenance Activities The principal maintenance objectives are to ensure that water flows unimpeded into the flow-through planter and landscaping remains attractive in appearance. Table 1 shows the routine maintenance activities, and the frequency at which they will be conducted. ' Table 1 Routine Maintenance Activities for Treatment Devices No. Maintenance Task Frequency of Task 1 Remove accumulated sediment, litter, and debris from the flow-through planter and dispose of properly. Confirm that no clogging will occur and that the treatment device will drain within three to four hours. Before wet season and as necessary Monthly during the wet season, and as needed after storm events 27 Inspect flow-through planter to ensure that there are no clogs. Test with garden hose to confirm that the planter will drain within three to four hours. 3 Inspect podium drains, roof drains, and sheet flow from paved areas to ensure flows to flow-through planter is unimpeded. Remove debris and repair damaged pipes. Check splash blocks or rocks and repair, replace, and replenish as necessary. Monthly during the wet season, and as needed after storm events 4 Inspect overflow pipe to ensure that it will safely convey excess flows to storm drain. Repair or replace any damaged or disconnected piping. Before the wet season, and as necessary 5 Inspect flow-through planter walls to ensure that they are structurally sound (no cracks or leaks). Repair as necessary. Annually 6 Inspect the flow-through planter using the attached inspection checklist. Monthly, or after large storm events, and after removal of accumulated debris or material Twice a year 7 Evaluate health of trees and groundcover. Remove and replace all dead and diseased vegetation. Treat vegetation using preventative and low -toxic methods. 8 Maintain vegetation and irrigation system. Prune and weed to keep flow- through planter neat and orderly in appearance. As needed 9 Checkthat mulch is at appropriate depth (3 inches per soil specifications) Monthly 10 Check that soil is at appropriate depth. Till or replace soil as necessary to maintain a minimum of 6" between top of mulch and overflow weir. Before wet season and as necessary. 11 Remove accumulated sediment, litter, and debris from detention vault and disposed of properly. Confirm that flow is unimpeded into and out of vault. Before wet season and as necessary Page 2 ATTY/AGR.2021.219/South Main (Page 16 of 19)