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Bioretention Area' Maintenance Plan for <br />CHEVRON STATION AT 2215 EL CAMINO REAL <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 />2215 EI Camino Real between Laurel & Willow <br />Assessor's Parcel No.: 053-372-150 <br />Property Owner: Baldev Mann <br />Phone No.:650-630-8588 <br />Designated Contact: Baldev Mann <br />Phone No.: 650-630-8588 <br />Mailing Address:2215 EI Camino Real, <br />Redwood City, 94061 <br />The property contains two bioretention area(s), located as described below and as shown <br />in the attached site plant. <br />• Bioretention Area No. 1 is located at the east side of the property along the back of sidewalk <br />on Willow Street. <br />• Bioretention Area No. 2 is located at the north side of the property. <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 />No. <br />Table 1 <br />Routine Maintenance Activities for Bioretention Areas <br />Maintenance Task <br />Frequency of Task <br />1 Remove obstructions, debris and trash from bioretention <br />Monthly, or as needed after storm <br />area and dispose of properly. <br />events <br />2 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 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 Remove and replace all dead and diseased vegetation. <br />Twice a year <br />5 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 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 />z Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />ATTY/AGR.2017.009/2215 EI Camino Real - Chevron <br />