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r . <br /> I <br /> 1 <br /> 1 <br /> Bioretention Areal Maintenance Plan for <br /> Westpoint Marina - Phase 2a <br /> 09/18/15 <br /> t ;, v .44_ 5590 Project Address and Cross Streets: 1529 <br /> •smt 4 t V Js " 1$ .:IF <br /> es <br /> Seaport Boulevard, Redwood City, CA 94063- <br /> .A.. <br /> , , -4 „ VGA-V <br /> q ” 'Assessor's Parcel No.: 054-300-680 <br /> ` :- = Property Owner: Westpoint Marina, LLC <br /> r r <br /> . . . .A... 74: Phone No. : 650-224-3250 4. <br /> a . _ Designated Contact: Mark Sanders <br /> ". : tp �`R sr. i .k , 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 of physical, biological, and Redwood City, CA 94063-5590 <br /> chemical treatment procr3sses. 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 plane. <br /> • Bioretenti rn Area No. 1 is located in the northeast portion 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 /> Table 1 <br /> Routine Maintenance Activities for Bioretention Areas <br /> No. Maintenance Task Frequency of Task <br /> 1 Remove obst actions, debris and trash from bioretention Monthly, or as needed after storm <br /> area and dispose of properly. events <br /> i 2 Inspect bioretention area to ensure that it drains between Monthly, or as needed after storm <br /> storms and w thin 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 /> 5 Maintain 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 m JIch is at appropriate depth (3 inches per soil Monthly <br /> specifications) and replenish as necessary before wet <br /> season begins. <br /> I Bioretention an as include linear treatment measures designed to filter water through biotreatment soils. A bioretention <br /> area that has no v aterf roof liner beneath it and has a raised underdrain in the underlying rock layer to promote <br /> infiltration, as shown ii 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 /> C.r at..nxllv.pput:44ucal.t,crcv>V N.4,,A V. <m X.0■IAtc+r.rf tit.tivaty::lk ax.W.IIUMUNLt i RWC nanrvse pin c.c <br /> ATTY/AGR.2016,00z./1529 Seaport - Phase 2 <br />