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Exhibit "A-4" <br /> Bioretention Areal Maintenance Plan for <br /> Design Tech Charter School <br /> June 3, 2016 <br /> 21 ‘__ / i •, Project Address and Cross Streets <br /> � . a _ 275 Oracle Parkway, Redwood City, CA 94065 <br /> Assessor's Parcel No.: 095-040-999 <br /> ter` u a <br /> '1 Property Owner: Oracle America Inc. <br /> - Phone No.: <br /> � � a Designated Contact: <br /> 4 <br /> '3/4C.4,'".,-' 4.:‘, 1 ''' ' .: Phone No.: <br /> Bioretention areas function as soil and plant- <br /> based filtration devices that remove pollutants Mailing Address: 500 Oracle Parkway 50P-8 <br /> through a variety of physical, biological, and <br /> chemical treatment processes. These facilities Redwood Shores, CA 94065 <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 6 bioretention area(s), located as described below and as shown in <br /> the attached C6.0 & C6. 1 Stormwater Management Plan. <br /> • Bioretention Area No. 1 is located within DMA-00 & DMA-01 , southwest of the parking lot. <br /> • Bioretention Area No. 2 is located within DMA-02, northwest of the school. <br /> • Bioretention Area No. 3 is located within DMA-03, northwest of the school. <br /> • Bioretention Area No. 4 is located within DMA-08, northeast of the school. <br /> • Bioretention Area No. 5 is located within DMA-13, southeast of the school. <br /> • Bioretention Area No. 6 is located within DMA-18, north of the BCDC parking area. <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 bioretention Monthly, or as needed after storm <br /> area and dispose of properly. events <br /> 2 Inspect bioretention area to ensure that it drains between Monthly, or as needed after storm <br /> storms and within five days after rainfall. events <br /> 3 Inspect inlets for channels, soil exposure or other Monthly, or as needed after storm <br /> evidence of erosion. Clear obstructions and remove events <br /> sediment. <br /> 4 Remove and replace all dead and diseased vegetation. Twice a year <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 /> Page 1 Revised 11/30/11 <br /> ,u%y1,uw2ssw1xaavaeve 0411 ecae<me.eaac for xwopc s 1 Mnewouc N{°RDA I.aewmrenmdwan <br /> ATTY/AGR/2016.160/CENTRUM OWNERS ASSOCIATION - STMMA <br /> REV: 06-22-16 JS <br />