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Bioretention Area' Maintenance Plan for <br />557 E Bayshore Road <br />April 2024 <br />Project Address and Cross Streets <br />557 E Bayshore Roadr Redwood City, CA 94063 <br />Whipple & E Bayshore Road <br />Assessor's Parcel No. 052-520-160, -330 <br />Property Owner: Redwood Crossing, LLC. <br />Phone No.: 415.448.8330 <br />Designated Contact: Glen Ceridono <br />Bioretention areas function as soil and plant -based Phone No.:415.448.8330 <br />filtration devices that remove pollutants through a <br />variety of physical, biological, and chemical treatment Mailing Address: 150 Pelican Way. San Rafael, CA 94901 <br />processes. These facilities normally consist of a ponding <br />area, mulch layer, vegetation and biotreatment soil mix. <br />The property contains 12 bioretention area(s), located as described below and as shown in the <br />attached site plan. <br />■ See Stormwater Management Plan C9.0 included in project drawings and Storm Drain Report. <br />I. Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, which reduces <br />pollutant removal efficiency and may lead to bioretention area failure. Routine maintenance activities, <br />and the frequency at which they will be conducted, are shown in 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, debris and trash from bioretention area <br />Monthly, or as needed after storm events <br />and dispose of properly. <br />2 <br />Inspect bioretention area to ensure that it drains between <br />Monthly, or as needed after storm events <br />storms and within five days after rainfall. If ponded water does <br />not drain within five days, check if drains are clogged or <br />consider removing the surface biotreatment soil and replacing <br />with the approved soil mix and replant <br />3 <br />Inspect inlets for channels, soil exposure or other evidence of <br />Monthly, or as needed after storm events <br />erosion. Clear obstructions and remove sediment. <br />4 <br />Remove and replace all dead and diseased vegetation. <br />Twice a year <br />1 Bioretention areas include linear treatment measures designed to filter water through biotreatment soils. A bioretention area that <br />has no waterproof liner beneath it and has a raised underdrain in the underlying rock layer to promote infiltration, as shown in <br />Section 6.1 of the C.3 Regulated Projects Guide, may also be called a "bioinfiltration area". <br />z Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page 1 Revised 1/1/20 <br />Bioretention area 0&M Template <br />ATTY/AGR.2024.174/Redwood Crossing LLC (557 E Bayshore STMMA) (Page 17 of 26) <br />