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6.C. - Page 57 of 111 Exhibit C-1 Bioretention Area' Maintenance Plan for 1180 Main Street 02/11/2020 I Bioretention areas function as soil and plant - based filtration devices that remove pollutants through a variety of physical, biological, and chemical treatment processes. These facilities normally consist of a ponding area, mulch layer, vegetation and biotreatment soil mix. Project Address and Cross Streets_ 1180 Main Street Redwood City, CA 94063 NE of intersection of Main Street and Elm Street Assessor's Parcel No.: 053-147-060, 053-147-070 Property Owner: Premia 1180 Main Owner, LLC Phone No.: (650) 600-7430 Designated Contact: Gloria Arteaga Phone No.: (650) 600-7432 Mailing Address: 801 Hamilton Street Redwood City, CA 94063 The property contains 2 bioretention area(s), located as described below and as shown in the attached site plane. ■ Treatment Area #4 is located at the North end of Elm Street • Treatment Area #5 is located at the South end of Elm Street) 1. Routine Maintenance Activities The principal maintenance objective is to prevent sediment buildup and clogging, which reduces pollutant removal efficiency and may lead to bioretention area failure. Routine maintenance activities, and the frequency at which they will be conducted, are shown in Table 1. Table 1 Routine Maintenance Activities for Bioretention Areas No. Maintenance Task Frequency of Task 1 Remove obstructions, debris and trash from bioretention Monthly, or as needed after storm area and dispose of properly. events 2 Inspect bioretention area to ensure that it drains between Monthly, or as needed after storm storms and within five days after rainfall. If ponded water events does not drain within five days, check if drains are clogged or consider removing the surface biotreatment soil and replacing with the approved soil mix and replant 3 Inspect inlets for channels, soil exposure or other Monthly, or as needed after storm evidence of erosion. Clear obstructions and remove events sediment. 4 Remove and replace all dead and diseased vegetation. Twice a year Bioretention areas include linear treatment measures designed to filter water through biotreatment soils. A bioretention area that has no waterproof liner beneath it and has a raised underdrain in the underlying rock layer to promote infiltration, as shown in Section 6.1 of the C.3 Technical Guidance, may also be called a "bioinfiltration area". z Attached site plan must match the site plan exhibit to Maintenance Agreement. Page 1 Revised 02/11/2020 Bioretention area O&M 'template ATTYIAGR.2020.0351Prem ia 1180 Main Owner, LLC (Page 13 of 18) 84