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Bioretention Area' Maintenance Plan for <br />Costco Wholesale <br />TBD <br />Project Address and Cross Streets 1155 & 1159 Beecher Street. Portions of 1900 Davis Street, <br />San Leandro CA 94577 <br />Assessor's Parcel No.:77A-675-4-9 77A-657-21 <br />Property Owner: Bill Stanfield, Costco Wholesale Phone No.: (425) 313-8100 <br />Designated Contact: Same Phone No.: Same <br />Mailing Address: 999 Lake Drive, Issaquah, WA 98207 <br />The property contains 5 bioretention area(s), located as described below and as shown in the <br />attached site plane. <br />■ Bioretention Area No. 1 is located at the eastern side of 1155 Beecher Street <br />■ Bioretention Area No. 2 is located at the southern side of 1155 Beecher Street <br />■ Bioretention Area No. 4 is located at the eastern side of 1900 Davis Street <br />■ Bioretention Area No. 5 is located at the northern side of 1155 Beecher Street <br />■ Bioretention Area No. 6 is located at the eastern side of 1900 Davis St., north of No.4 <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 Bloretention Areas <br />No. <br />Maintenance Task <br />Frequency of Task <br />1 <br />■ Remove obstructions, debris, accumulated sediment and trash <br />Monthly <br />from bioretention area and dispose of properly. <br />■ Maintain vegetation and the irrigation system. Prune and weed <br />to keep bioretention area neat and orderly in appearance. <br />2 <br />■ Remove and replace all dead and diseased vegetation <br />Before wet season (August or <br />(replace plants in kind, or per Alameda Countywide Clean <br />September), and <br />Water Program C.3 Technical Guidance Appendix B plant list). <br />After wet season (May) <br />■ Till or replace soil (using biotreatment soil mix specified in C.3 <br />Technical Guidance Appendix K) as necessary to maintain the <br />design elevation of soil. <br />3 <br />■ Inspect bioretention area using the attached inspection <br />Before wet season (inspect in <br />checklist. <br />August make all corrections by <br />September 30), and <br />After wet season (May), and <br />Monthly during wet season (October <br />through April) <br />il. Prohibitions <br />The use of pesticides and quick release fertilizers is strongly discouraged. For the purposes of <br />stormwater treatment measure maintenance and function, it is anticipated that non -chemical <br />1 Bioretention areas include linear treatment measures designed for water to filter through biotreatment soils. A <br />bioretention area that is unlined and has a raised underdrain in the underlying rock layer to promote infiltration, as <br />shown in Section 6.1, may also be called a "bioinfiltration area". <br />2 Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page 1 Last revised March 2019 <br />