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Bioretention Area' Maintenance Plan for <br />Residential Construction Project at 437 Iris Street, Redwood City, CA 94062 <br />08/22/2022 <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 437 <br />Iris Street, Redwood City, CA 94062 <br />Assessor's Parcel No.: 052-296-180 <br />Property Owner: Sara Sevedin <br />Phone No.: 408-656-2207 <br />Designated Contact: Sara Seyedin <br />Phone No.:408-656-2207 <br />Mailing Address: 17110 Scott Drive, Monte <br />Sereno, CA 95030 <br />The property contains one bioretention area, located as described below and as shown in <br />the attached site plane. <br />Bioretention Area No. 1 and 2 are located at the front yard <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 />6 <br />Check that mulch is at appropriate depth (3 inches per soil <br />Monthly <br />specifications) and replenish as necessary before wet <br />season begins. <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 1 Revised 11/30/11 <br />ATTY/AGR.2023.001/Sara Seyedin (437 Iris Street) (Page 13 of 15) <br />