Controls Maint Agmt Stormwater Treatment 06092017

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Bioretention Area 1 Maintenance Plan for 2001 WILLIAMS STREET, SAN LEANDRO 6/9/2017 Project Address and Cross Streets 2001 Williams Street. San Leandro. CA Assessor's Parcel No.: -=-07._7""'A~-...:.0.:....70=0=--=0=22=--...:.o=o _______________ _ Property Owner: -~D~C~T_W~il~lia~m_s~S~tre~e~t ..... L=L""'C~-Phone No.: ________ _ Designated Contact: -'-T_._e ...... rr"'"'i A"""l""'le""n'--------Phone No.: (949) 219-1242 Mailing Address: __ 1.:...:2=-C=or:..cp=o.:...:ra=te.:o....:....P..:..:la=z=a.._. S=ui=te:........:..;15=0~·~N=e::..:.w:..cp=o"-'rt"""B=e=a=c~h.'""'C=Ac....:....:9=2=66=0=------ The property contains 8 bioretention area(s), located as described below and as shown in the attached site plan 2 • • Bioretention Area No. 1 is located near the southeast corner of the building. • Bioretention Area No. 2 is located near the southwest corner of the building. • Bioretention Area No. 3 is located near the northeast corner of the building. • Bioretention Area No. 4 is located north of the building and west of Bioretention Area No. 3. • Bioretention Area No. 5 is located north of the building and west of Bioretention Area No. 4. • Bioretention Area No. 6 is located west of the building. • Bioretention Area No. 7 A is located near the northwest corner of the building and east of the main entry. • Bioretention Area No. 78 is located near the northwest corner of the building and west of the main entry. 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 events area and dispose of properly. 2 Inspect bioretention area to ensure that it drains between Monthly, or as needed after storm events storms and within five days after rainfall. 3 Inspect inlets for channels, soil exposure or other Monthly, or as needed after storm events evidence of erosion. Clear obstructions and remove 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 needed weed to keep bioretention area neat and orderly in appearance. 6 Check that mulch is at appropriate depth (3 inches per soil Monthly specifications) and replenish as necessary before wet season begins. 7 Inspect bioretention area using the attached inspection Monthly, or after large storm events, and after checklist. removal of accumulated debris or material 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 NOS Approved Template Revised 11/28/11