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Bioretention Area Maintenance Plan for <br />Pacific Shores <br />April 13, 2022 <br />Project Address and Cross Streets: 1200 Seaport Boulevard, Redwood City, CA <br />94063 <br />Assessor's Parcel No.: 054-330-070 <br />Property Owner: Google LLC., a Delaware limited liability company <br />Phone No.:(650) 495-4486 <br />Designated Contact: Rachel Rockholt Phone No.:(408) 453-7400 <br />Mailing Address: 255 W. Santa Clara Street 121' Floor San Jose CA 95113 <br />The property contains 8 bioretention area(s), located as described below and as shown in <br />the attached site plan'. <br />Bioretention Area No. 19-26 is located at 1200 Seaport Boulevard. Refer to Exhibi 1& 1A included as part of Appendix <br />B. <br />I. Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, which <br />reduces pollutant removal efficiency and may lead to bioretention area failure. Routine <br />maintenance activities, and the frequency at which they will be conducted, are shown in <br />Table 1. <br />Table 1 <br />Routine Maintenance Activities for Bioretention Areas <br />No. <br />Maintenance Task <br />Frequency of Task <br />1 <br />Remove obstructions, weeds, debris and trash from <br />Quarterly, or as needed after storm <br />bioretention area and its inlets and outlets; and dispose of <br />events <br />properly. <br />2 <br />Inspect bioretention area for standing water. If standing <br />Quarterly, or as needed after storm <br />water does not drain within 2-3 days, till and replace the <br />events <br />surface biotreatment soil with the approved soil mix and <br />replant. <br />3 <br />Check underdrains for clogging. Use the cleanout riser to <br />Quarterly, or as needed after storm <br />clean any clogged underdrains. <br />events <br />4 <br />Maintain the irrigation system and ensure that plants are <br />Quarterly <br />receiving the correct amount of water (if applicable). <br />5 <br />Ensure that the vegetation is healthy and dense enough to <br />Annually, before the wet season <br />provide filtering and protect soils from erosion. Prune and <br />begins <br />weed the bioretention area. Remove and/or replace any <br />dead plants. <br />6 <br />Use compost and other natural soil amendments and <br />Annually, before the wet season <br />fertilizers instead of synthetic fertilizers, especially if the <br />begins <br />system uses an underdrain. <br />7 <br />Check that mulch is at appropriate depth (2 - 3 inches per <br />Annually, before the wet season <br />soil specifications) and replenish as necessary before wet <br />begins <br />season begins. It is recommended that 2" — 3" of arbor <br />mulch be reapplied every year. <br />8 <br />Inspect the energy dissipation at the inlet to ensure it is <br />Annually, before the wet season <br />functioning adequately, and that there is no scour of the <br />begins <br />surface mulch. Remove accumulated sediment. <br />Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page 1 <br />