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Bioretention Area Maintenance Plan for <br /> Westpoint Marina — Phase 2a <br /> 09/18/15 <br /> ` Project Address and Cross Streets: 1529 <br /> Seaport Boulevard, Redwood City, CA 94063- <br /> -r .... = 5590 <br /> �k - r � z Assessor's Parcel No.: 054-300-680 <br /> Property Owner: Westpoint Marina, LLC <br /> ttitticttE <br /> Phone No. : 650-224-3250 <br /> Designated Contact: Mark Sanders <br /> l 4 p1 _ 7 't 11 <br /> r 112cT " ' `C Phone No. : 650-224-3250 <br /> Bioretention areas 'unction as soil and plant- <br /> based filtration devices that remove pollutants Mailing Address: 1529 Seaport Boulevard, <br /> through a variety ;f physical, biological, and Redwood City, CA 94063-5590 <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 one bioretention area(s) , located as described below and as shown <br /> in the attached site plan'. <br /> • Bioretenti xi Area No. 1 is located in the northeast portion of the property. <br /> 1. Routile 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 obstuctions, 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 ft drains between Monthly, or as needed after storm <br /> storms and 'N thin five days after rainfall. events <br /> 3 Inspect inlets for channels, soil exposure or other Monthly, or as needed after storm <br /> 'I. evidence of erosion. Clear obstructions and remove events <br /> sediment. <br /> 4 Remove and replace all dead and diseased vegetation. Twice a year <br /> 5 Mainteir vegetation and the irrigation system. Prune and Before wet season begins, or as <br /> weed to keep bioretention area neat and orderly in needed <br /> appearance. <br /> 6 Check that rn JIch is at appropriate depth (3 inches per soil Monthly <br /> specificatiors) and replenish as necessary before wet <br /> season begins. <br /> Bioretention are as i 1clude linear treatment measures designed to filter water through biotreatment soils. A bioretention <br /> area that has no ‘.-. ater roof liner beneath it and has a raised underdrain in the underlying_ rock layer to promote <br /> infiltration, as shown ie Section 6. 1 of the C.3 Technical Guidance. may also be called a "biointiltration area". <br /> Attached site 1 an must match the site plan exhibit to Maintenance Agreement. <br /> Page 1 Revised it/30:11 <br /> sokiuksi <br /> ATTY/AGR.2016.00z11529 Seaport - Phase 2 <br />