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8.A. - Page 145 of 154 <br />REV: 01-20-21 PR <br />Bioretentlon Area' Maintenance Plan for <br />1548 Maple Street <br />October 23, 2019 <br />aionelention areas runctim as sail and plant- based <br />fiftrarion devices dial remove pollulanfs through a <br />variety ofphysical, biological and chemical <br />treaiment processes. These facilities normally <br />consist ole ponding area. mulch sayer vegetation <br />and biotreatment sol! mix <br />1548 Maple street <br />Redwood City, CA 94063 <br />Project Address and Cross Streets: 154BManle Street Redwood City, CA 94063 <br />Assessor's Parcel No.: 052-532-010 <br />Property Owner: 1548 Maple LLC <br />Phone No_, 1925)-257-4350 <br />Designated Contact Michael Oshorne <br />Phone No.: (925)-257A350 <br />Mailing Address' 3675 Mt. Diablo Blvd, Suite 310. Lafayette, CA 94549 <br />This properly contains 29 bioratentien area(s) as shown in the attached storm water management plan'. <br />I. Routine Maintenance Activities <br />The pnncipai maintenance ob)ective is to prevent sediment buildup and clogging, which reduces pollutant removal efficiency and <br />may lead to bioratention area failure. Routne maintenance activities, and She frequency at which they vAll be conducted, are shown <br />in Table 1. <br />Table 1 <br />Rou£Yne Maintenance Activities for Bioretentlon Areas <br />No. <br />Maintenance Task <br />Freq uency of Task <br />1 <br />Remove obstructions, debris and trash from hioretenton area andd <br />Monthly, oras needed after storm events <br />ispose of properly. <br />Impact bioretentionarea toensure that itdrainsbebAeenu6mis <br />Monthly. or as needed afterstorm events <br />2 <br />and within Ave days after rainfall. If pondeci water does not drain <br />v, thin five days. effects if drains are clogged or consider removing <br />the surface biotreaimenl soil awdreplacingwith the approved soil <br />mixandre last <br />Inspect In lets for channels, soil exposure or other evidence of <br />Monthly, or as needed after storm events <br />3 <br />erosion. Clear obstructions and remove sediment <br />Remove and rep lace all dead and diseased vegetation. <br />Twice a year <br />Biorctentim areas include linear treaanear measures desigped to filter want tbmugh hio�rmenr soils. A biorcunsion area ihothas no waterproof liner <br />benenfh it andhss a miscd iuiderdrain in the enderlyingrock layer to promote infiltration, as shown in Section 6. t nfthe C.3 Technical Guidance, may also <br />be tailed x"bioinfi1=doa area;'_ <br />a Anacbed site plea must mauls the sire plan exhihit to Maintenance Ageemem. <br />Page4 <br />Revised rnrse <br />Bion,=oon arm O&MTemplate <br />ATTYIAGR.2021.009I1548 Maple LLC (1548 Maple - STMMA) (Page 26 of 34) 357 <br />