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i <br /> 6.1 .B. - Page 16 <br /> Exhibit C <br /> Bloretention Areal Maintenance Plan for <br /> Sequoia Union High School District <br /> Transportation and Maintenance Facility <br /> November 10, 2014 <br /> I:1 - � Project Address and Cross Streets: <br /> °8 l 1061 Douglas Ave, Redwood City x Broadway <br /> Assessor's Parcel No.: 054-040-010 <br /> f Property Owner: Sequoia Union High School District <br /> Phone No.:650-369-1611 <br /> ,� Designated Contact: Walter Haub, Facilities Director <br /> „ - Phone No.:650-369-1411 ext 22241 <br /> Bioretention areas function as soil and plant- Mailing Address:1090 Mills Way, Redwood City,CA <br /> based filtration devices that remove pollutants 94063 <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 /> The property contains Five (5) bioretention area(s), located as described below and as <br /> shown in the attached site plan . <br /> • Bioretention Area No. 1 is located and centered along easterly property line and adjacent to <br /> Douglas Avenue and is 4068 square feet <br /> • Bioretention Area No. 2 is located along the southerly property line and adjacent to the <br /> pedestrian vehicle parking lot and is an 1873 square foot area <br /> • Bioretention Area No. 3 is located along the westerly property line and adjacent to the <br /> pedestrian vehicle parking lot. Also along the southerly property line and adjacent to the bus <br /> parking lot and is 2600 square feet <br /> • Bioretention Area 4 is along the westerly property line and adjacent to the bus parking lot and <br /> is 921 square feet <br /> • Bioretention area 5 is along the northerly property line and adjacent to the bus parking lot and <br /> is 2468 square feet. <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. Maintenance Task Frequency of Task <br /> 1 Remove obstructions,debris and trash from boretentlon Monthly,or as needed after storm <br /> area and dispose of properly. events <br /> I 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 /> 2 Attached site plan must match the site plan exhibit to Maintenance Agreement. <br /> Page 1 Revised 11/30/11 <br /> CWgAnNeremeMfTeale mgtslyevgLWfWuwRTeeyrt.,3Nemct Me AYorteelAudoNVIUVIIIM LAppgpnBlm[e.piek8.Idm <br /> ATTY/AGR.2015.209/1061 Douglas Ave <br />