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Bioretention Area' Maintenance Plan for <br />515 Cleveland St. - 433 Harrison Ave. <br />February 12, 2019 <br />Bioretention areas function as soil and plant - <br />based filtration devices that remove pollutants <br />through a variety of physical, biological, and <br />chemical treatment processes. These facilities <br />normally consist of a ponding area, mulch layer, <br />vegetation and biotreatment soil mix. <br />Project Address and Cross Streets: 515 <br />Cleveland St. — 433 Harrison Ave. <br />Redwood City, CA 94062 <br />Assessor's Parcel No.: 053-035-010, 020, 030, <br />040,050,060,070 <br />. Property Owner: Harrison Avenue, LP. <br />Phone No.: (650)-213-1129 <br />Designated Contact: Forrest Mozart <br />Phone No.: (650)-213-1129 <br />Mailing Address: 1068 Meadow Drive <br />Palo Alto, CA 94303 <br />This property contains 5 bioretention area(s) as shown in the attached storm water <br />management plane. <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 />IFrequency of Task <br />1 <br />Remove obstructions, debris and trash from bioretention <br />Monthly, or as needed after storm <br />area and dispose of properly. <br />events <br />2 <br />Inspect bioretention area to ensure that it drains between <br />Monthly, or as needed after storm <br />storms and within five days after rainfall. If ponded water <br />events <br />does not drain within five days, check if drains are <br />clogged or consider removing the surface biotreatment <br />soil and replacing with the approved soil mix and replant <br />3 <br />Inspect inlets for channels, soil exposure or other <br />Monthly, or as needed after storm <br />evidence of erosion. Clear obstructions and remove <br />events <br />sediment. <br />4 <br />Remove and replace all dead and diseased vegetation. <br />Twice a year <br />'Bioretention areas include linear treatment measures designed to filter water through biotreatment soils. A Bioretention <br />area that has no waterproof liner beneath it and has a raised underdrain in the underlying rock layer to promote <br />infiltration, as shown in Section 6.1 of the C.3 Technical Guidance, may also be called a "bioinfiltration area". <br />'Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page 5 of 13 <br />ATTY/AGR/2019.203/515 CLEVELAND - STMMA EXHIBIT C <br />REV: 07-25-19 DZ <br />