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Bioretention Areal Maintenance Plan <br />for 3247 Oak Knoll Drive <br />April 27, 2021 <br />Bioretention areas function as soil and plant -based <br />filtration devices that remove pollutants through <br />variety of physical, biological, and chemical treatment <br />processes. These facilities normally consist of a <br />ponding area, mulch layer, vegetation and <br />biotreatment soil mix. <br />Project Address and Cross Streets <br />3247 Oak Knoll Drive / Oak Knoll <br />Assessor's Parcel No. 057-211-040 <br />Property Owner: Mr. Timothy Regan, Owner <br />Phone No.: (650) 578-1237 <br />Designated Contact: James E Thompson, JET Engineering <br />Phone No.: (650) 260-2755 <br />Mailing Address: 1048 EI Camino Real, STE C, RWC CA <br />The property contains Seven (7) Bioretention area(s), located on the subject property and as <br />shown in the attached site plant. <br />I. Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, which reduces <br />pollutant removal efficiency and may lead to Bioretention area failure. Routine maintenance <br />activities, and the frequency at which they will be conducted, are shown in Table 1. <br />Table 1 <br />Routine Maintenance Activities for Bioretention Areas <br />Maintenance Task <br />Remove obstructions, debris and trash from Bioretention <br />area and dispose of properly. <br />2 Inspect Bioretentlon area to ensure that It drains between <br />storms and within five days after rainfall. If ponded water <br />does not drain within flue days, check if drains are clogged or <br />consider removing the surface biotreatment soil and <br />replacing with the approved soil mix and replant <br />3 <br />Inspect inlets for channels, soil exposure or other evidence <br />of erosion. Clear obstructions and remove sediment. <br />- i- <br />4 Remove and replace all dead and diseased vegetation. <br />Frequency of Task <br />Monthly, or as needed after storm events <br />Monthly, or as needed after storm events <br />Monthly, or as needed after storm events <br />Twice a year <br />1 Bioretentlon areas include linear treatment measures designed to filter water through biotreatment soils. A Bioretention area <br />that has no waterproof liner beneath it and has a raised underdrain in the underlying rock layer to prom ote.infiltration, as shown <br />in Section 6.1 of the C.3 Regulated Projects Guide, may also be called a "bioinfiltration area". <br />2Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page 1 <br />Bioretention area O&M Template <br />ATTY/AGR.2022.060/Timothy Regan (Page 15 of 23) <br />