RecDoc2021-174215 -STMMA 101 Westpoint Harbor Phase 3

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Bioretention Area' Maintenance Plan for Westpoint Marina Phase 3 10/10/21 t Project Address and Cross Streets: LAL _ .1 101 Westpoint Harbor Drive, Redwood City, CA 7— 94063-5590 a Sioretention areas function as sat and plant - based fWalion devices that remove poblulanls through a varielyofphysicat. biological, and chemical trealment processes. These facilities normatiy consist of a grass buffer strip, sand bed, ponding area, organic layer or mulch layer, planting sok, and plants. Assessor's Parcel No.: 054-300-680 Property Owner Westpoint Marina, LLC Phone No.: (650) 701-0545 Designated Contact: Mark Sanders Phone No.: (650) 701-0545 Mailing Address: 101 Westpoint Harbor Drive, Redwood City, CA 94063-5590 The property contains one bioretention area(s), located as described below and as shown in the attached site plant • Bioretention Area A is located along the northerly edge of the driveway at the entrance. • Bioretention Area B is located along the northerly edge of the driveway. • Bloretentlon Area C is located along the northerly edge of the driveway. • Bioretention Area D is located along the northerly edge of the driveway. ■ Bloretention Area E is located along the northerly edge of the driveway. • Bioretention Area F is located along the northerly edge of the driveway. • Bioretention Area G is located on the northerly side of the cul-de-sac. • Bioretention Area H is located to the west of the Yacht Club and Restaurant building. 1. Routine Maintenance Activities The principal maintenance objective is to prevent sediment buildup and clogging, which reduces pollutant removal efficiency and may lead to bioretenliou area failure. Routine maintenance activities, and the frequency at which they will be conducted, are shown in Table 1. Table 1 Routine Maintenance Activities for 61oretention Areae Maintenance Task I Frequency of Task 1 I Remove obstructions, debris and trash from bioretentlon Monthly, or as needed after storm area and dispose of property. events 2 Inspect biorelenlion area to ensure [hat it drains between Monthly, or as needed after storm storms and within five days after rainfall, events 3 Inspect inlets for channels, soil exposure or otherMonthly, or as needed atter storm evidence of erasion. Clear obstructions and remove events sedlmenl. Bioretention awas include linear treatment measures designed to lilterNvater through bioueatmeul soils. A hiuretentiun area that has ria waterproof liner beneath it and has a raised uuderdrain in the underlying nwk layer to pmmule infiltration, as shown in Section G.1 of the C.3 Technical Guidance, may also he called a " bioinftltration arca". Attached site plan must match the site plan exhibit to Maintenance Agreement, Page 1 Revised 11130111 REV: 11-05-2021 VR ATTY/AGR.2021.279/Westpoint Harbor LLC (Page 17 of 20)