Stormwater Treatment Measures & Hydromodification Managment Controls Maintenance Agreement 2024136428

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Bioretention Area' Maintenance Plan for 1800 Merced St. 10/15/2021 Project Address and Cross Streets: 1800 Merced St. (Merced St. and Williams St) Assessor's Parcel No.: 77A-735-2-2 Property Owner: Allan & Henry, Inc. Phone No.: (619) 718-6565 Designated Contact: Mark Bitterlin Phone No.:1619) 718-6565 Mailing Address: P.O. Box 81007, San Diego CA 92138 The property contains (1) bioretention area, located as described below and as shown in the attached site plane. ■ Bioretention Area No. 1 is located south of building between customer parking area and loading dock and truck parking area. 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 Bloretention Areas No. Maintenance Task Frequency of Task 1 ■ Remove obstructions, debris, accumulated sediment and trash Monthly from bioretention area and dispose of properly. ■ Maintain vegetation and the irrigation system. Prune and weed to keep bioretention area neat and orderly in appearance. 2 ■ Remove and replace all dead and diseased vegetation Before wet season (August or (replace plants in kind, or per Alameda Countywide Clean September), and Water Program C.3 Technical Guidance Appendix B plant list). After wet season (May) ■ Till or replace soil (using biotreatment soil mix specified in C.3 Technical Guidance Appendix K) as necessary to maintain the design elevation of soil. 3 ■ Inspect bioretention area using the attached inspection Before wet season (inspect in checklist. August make all corrections by September 30), and After wet season (May), and Monthly during wet season (October through April) II. Prohibitions The use of pesticides and quick release fertilizers is strongly discouraged. For the purposes of stormwater treatment measure maintenance and function, it is anticipated that non -chemical controls (i.e., biological, physical, and cultural controls) will be adequate to address any pest problems. Proper and timely maintenance, as described in this plan, should serve to reduce the potential for pest establishment. To avoid the need for pesticides or quick release fertilizers, follow the principles of integrated pest management (IPM): 1 Bioretention areas include linear treatment measures designed for water to filter through biotreatment soils. A bioretention area that is unlined and has a raised underdrain in the underlying rock layer to promote infiltration, as shown in Section 6.1, may also be called a "bioinfiltration area". 2 Attached site plan must match the site plan exhibit to Maintenance Agreement. Page 1 Last revised March 2019