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6.D. - Page 101 of 108 Bioretention Area Maintenance Plan for 353 Main Street August 21, 2019 Project Address and Cross Streets: 353 Main Street — Veterans Drive. Assessor's Parcel No.: 052-38-3370 Property Owner: 353 Main Street Apartments, LP Phone No.: 408-984-5600 Designated Contact: Drew Walstrum Phone No.: 408-984-5600 Mailing Address: 1650 Lafayette Street, Santa Clara, CA 95054 The property contains 1 bioretention area(s), located as described below and as shown in the attached site plan'. Bioretention Pond is located North-Eastern corner of property adjacent to the building. E. Routine Maintenance Activities The principal maintenance objective is to prevent sediment buildup and clogging, which reduces pollutant removal efficiency and may lead to bioretention area failure. Routine maintenance activities, and the frequency at which they will be conducted, are shown in Table 1. Table 9 Routine Maintenance Activities for Bioretention Areas No. Maintenance Task Frequency of Task 1 Remove obstructions, weeds, debris and trash from Quarterly, or as needed after storm bioretention area and its inlets and outlets; and dispose of events properly. 2 Inspect bioretention area for standing water. if standing Quarterly, or as needed after storm water does not drain within 2-3 days, till and replace the events surface biotreatment soil with the approved soil mix and replant. 3 Check underdrains for clogging. Use the cleanout riser to Quarterly, or as needed after storm clean any clogged underdrains. events 4 Maintain the irrigation system and ensure that plants Quarterly are receiving the correct amount of water (if applicable). 5 Ensure that the vegetation is healthy and dense Annually, before the wet season enough to provide filtering and protect soils from begins erosion. Prune and weed the bioretention area. Remove andlor replace any dead plants. g Use compost and other natural soil amendments and Annually, before the wet season fertilizers instead of synthetic fertilizers, especially if begins the system uses an underdrain. 7 Check that mulch is at appropriate depth (2 - 3 inches per Annually, before the wet season soil specifications) and replenish as necessary before wet begins season begins. It is recommended that 2" — 3" of arbor mulch be reapplied every year. 8 Inspect the energy dissipation at the inlet to ensure it is Annually, before the wet season functioning adequately, and that there is no scour of the begins surface mulch. Remove accumulated sediment. Attached site plan must match the site plan exhibit to Maintenance Agreement. Page t ATTYIAGR.2019.31 Mood side Professional Center, LLC (Page 27 of 29) 239