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Flow -Through Planter Maintenance Plan for 851 Main Street April 20, 2018 Flow-through planters are designed to treat and temporarily detain runoff without allowing seepage into the underlying soil. They typically receive runoff via downspouts leading from the roofs of adjacent buildings. Project Address and Cross Streets 851 Main Street Assessor's Parcel No.:053-233-06. 053-233-11, 053-233-12 Property Owner: Gary Johnson, 855 Main Street, RWC LLC Phone No.: 650-324-9439 Designated Contact: Phone No.: Mailing Address: 125 Willow Road, Menlo Park, CA 94025 The property contains 1 flow-through planter(s), located as described below and as shown in the attached site plan: Flow -Through Planter No. 1 is located at the west side of the building adjacent to the terrace and the exterior of the building on the second floor. 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 Flow -Through Planters No. Maintenance Task Frequency of Task 1 Evaluate health of trees and groundcover. Remove and replace all dead Twice a year and diseased vegetation. 2 Maintain vegetation and the irrigation system. Prune and weed to keep flow- As needed through planter neat and orderly in appearance. 3 Check that mulch is 3" deep and replenish as necessary. It is recommended As needed that composted arbor mulch be applied once per year to maintain the 3" depth in all bare soil areas except within six inches of tree trunks. 4 Check that soil is at appropriate depth. Till or replace soil with the approved Before wet season and as biotreatment soil mix as necessary to maintain a minimum of 6 inches necessary between top of mulch and overflow weir. 5 Remove accumulated sediment, litter and debris from flow-through planter Before wet season and as and dispose of properly. Confirm that no clogging will occur and that the box necessary will drain within three to four hours. 6 Inspect flow-through planter to ensure that there are no clogs. Test with Monthly during the wet season, garden hose to confirm that the planter will drain within three to four hours. and as needed after storm events Page 1 Updated 7/1/16 ATTY/AGR/2018.230/855 MAIN STREET RWC, LLC -STMMA REV: 10-11-18 PR Page 13 of 19