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REV: 01-20-21 PR <br />Bioretention Area' Maintenance Plan for <br />1548 Maple Street <br />October 23, 2019 <br />alorelention areas function as sail and plant- based <br />filtration devices dial remove pollutants through a <br />variety ofphysical, biological and chemical <br />treatment processes. These racililiesnormally <br />consist of a ponding area, mulch layer vegetation <br />and blotealment soil mix <br />1548 Maple Street <br />Redwood City, CA 94063 <br />Project Address and Cross Streets: 1548Maplg Street Radwopd Cily. CA 94453 <br />Assessor's Parcel No.: 052-532-010 <br />Property Owner: 1548 Maple LLC <br />Phone No: (925)-257-4350 <br />Designated Contact FAchnal Osborne <br />Phone No: (925)-257-4350 <br />Mailing Address•:i875 Mt. Dido Blvd. Suite 310, Lafavelte. CA 94549 <br />This property contains 29 bioretention area(s) as shown in the attached storm water management plane <br />I. Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, which reduces pollutant removal efficiency and <br />may lead to bioetention area failure. Routine maintenance activities, and the frequency at which they will be conducted, are shown <br />in Table 1 <br />Table 1 <br />Routine Maintenance Activities for Btoretentlon Areas <br />NO. <br />Maintenance Task <br />Prequency of Task <br />1 <br />Remove o s uc ons,de s and Forn bloretenflon area ana d <br />MoRlily, or 57naMed after sorm events <br />ispose of properly. <br />Inspect bloretention area to ensure that itdrains between stones <br />Monihty, oras needed afterstorm events <br />2 <br />and within five days after rainfall. If ponded water does not drain <br />within five days, effects if drains are clogged or consider removing <br />the surface biotreatment soil amd replacing with the approved soil <br />�*enfant <br />_ <br />Inspect In lets for channels, soil exposure or other evidence of <br />Monthly, or as needed afterstorm 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 />Bioretention Areas include linear treatment measures designed to filter water through biotreannent soils. A hioretension Area that has no waterproof liner <br />heneath it andhas a raised uuderdram in the underlying rock layer to promote infiltration, as shovia in Section 6.1 of the C.3 Technical Guidance, may Also <br />he called a "biomfiltration area'. <br />Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page4 <br />Revised 711116 <br />Bi—umlion area O&MTemplate <br />ATTY/AGR.2021.009/1548 Maple LLC (1548 Maple - STMMA) (Page 26 of 34) <br />