RecDoc2023-001825 242Walnut Street STMMA

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EXHIBIT C Bioretention Area' Maintenance Plan for [[_= 242 Walnut Street =_]] [[_= Date: _]] I Project Address and Cross Streets 242 Walnut Street Cross Street: Convention Way OF =-,--J 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 grass buffer strip, sand bed, ponding area, organic layer or mulch layer, planting soil, and plants. Assessor's Parcel No.: 052-385-050 Property Owner: Phone No.: 415-205-2518 Designated Contact: Marty Friedman Phone No.: Mailing Address: 20211 Patio Drive, Ste. 145, Castro Valley, CA 94546 The property contains [[_= 1 =_]] bioretention area(s), located as described below and as shown in the attached site plan'. Bioretention Area No. 1 is located at [[_= Southwest of the project site I. 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. events 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 5 Maintain vegetation and the irrigation system. Prune and Before wet season begins, or as weed to keep bioretention area neat and orderly in needed appearance. ' 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". 2 Attached site plan must match the site plan exhibit to Maintenance Agreement. Page 1 Revised 11/30/11 F:VSm1.�4M13 Ncw DwebpmmtlC 3 Radud lC 3 Twh (hudmc."II Upd.lalFMAL DBAPTNov 20I 11602- SMCNRP 61 Bind A.0 Lenp6l Fm.l D.ilL ATTY/AGR.2022.035/PBA II, LLC (242 Walnut Street) (Page 13 of 16)