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Bioretention Area' Maintenance Plan for <br />Residential Construction Project at 1460 Kentfield Avenue, Redwood City, CA 94061 <br />ti 1 <br />fir►:. _ - .. ■ , , � ` � � ] _ � .-'w <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 />08/22/2022 <br />Project Address and Cross Streets 1460 <br />Kentfield Avenue. Redwood City. CA 94061 <br />Assessor's Parcel No.: 059041630 <br />Property Owner: Cypress Capital Group <br />Phone No.: (65011995-3600 <br />Designated Contact: Wen Shiau <br />Phone No.:(650) 995 -3600 <br />Mailing Address: 564 Casita Way, Los <br />Altos CA 94022 <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 />z Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page 1 Revised 11/30/11 <br />hnps4/d.dow Iheod196ee496e001 � CIHVR kJ 011r BvaW/8UBA9T191DN37 I 8heetAwwW 0y937] 91-B6filhaboo Pkvk A4 ni <br />REV: 06-12-2023 SK <br />A7TY/AGR.2023.134/Cypress Capital Partners 2019, LP (1460 Kentfield Ave) (Page 13 of 18) <br />