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1200-1900 Seaport Boulevard <br />Redwood City, CA 94063 <br />Bioretention Area' Maintenance Plan for <br />Google Pacific Shores <br />March 23, 2018 <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 ponding area, mulch layer, <br />vegetation and biotreatment soil mix. <br />Project Address and Cross Streets: 1200-1900 <br />Seaport Blvd. Redwood City, CA 94063 <br />Assessor's Parcel No.: 054-330-110,210,220, <br />270 <br />Property Owner: G000le. Inc. <br />Phone No.: (708)-447-7052 <br />Designated Contact: Casoar Wanner <br />Phone No.: (708)-447-7052 <br />Mailing Address: 1600 Amphitheatre Parkwav <br />Mountain View. CA 94043 <br />This property contains 17 bioretention area(s) as shown in the attached storm water <br />management plane. <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 />No. <br />Table 1 <br />Routine Maintenance Activities for Bioretention Areas <br />Maintenance Task <br />1 Remove obstructions, debris and trash from bioretention <br />area and dispose of properly. <br />Frequency of Task <br />Monthly, or as needed after storm <br />events <br />2 Inspect bioretention area to ensure that it drains between <br />Monthly, or as needed after storm <br />storms and within five days after rainfall. if ponded water <br />events <br />does not drain within five days, check if drains are <br />clogged or consider removing the surface biotreatment <br />soil and replacing with the approved soil mix and replant <br />3 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 Remove and replace all dead and diseased vegetation. Twice a year <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 "bioinfrltration area". <br />2 Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page 4 <br />Bioretention area O&M Template <br />ATTY/AGR.2018.092/Google Inc. <br />Revised 7/1/16 <br />