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Bioretention Area' Maintenance Plan for <br />Kennedy Middle School SRTS <br />May 23, 2018 <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 grass buffer strip, sand bed, <br />ponding area, organic layer or mulch layer, <br />planting soil, and plants. <br />Project Address and Cross Streets <br />2521 Goodwin Ave Redwood City, CA 94061 <br />Assessor's Parcel No.: 069052010 <br />Property Owner: Redwood City Elementary <br />School District <br />Phone No.: (650) 482-2200 <br />Designated Contact: Suoerindentendent <br />Mailing Address: 750 Bradford Street, <br />Redwood City, CA 94063 <br />The property contains 3 bioretention area(s), located as described below and as shown in <br />the attached site plant. <br />• Bioretention Area No. 1 is located at the south-east edge of the parcel, adjacent to the <br />existing baseball field <br />Bioretention Areas Nos. 2 and 3 are located at the east edge of the parcel, adjacent to the <br />pedestrian access gate in the existing fence. <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 />Frequency 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. <br />events <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 />5 <br />Maintain vegetation and the irrigation system. Prune and <br />Before wet season begins, or as <br />weed to keep bioretention area neat and orderly in <br />needed <br />appearance. <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 />z Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page 1 Revised 11/30/11 <br />REV: 07.27-18 PR� Page 19 of 23 <br />AT-FY/AGR/2018.162/REDWOOD CITY SCHOOL DISTRICT - STMMA <br />