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• Bioretention Area Maintenance Plan for 1717 Doolittle Drive, San Leandro Ca Assessor's Parcel No.: 79A-541-10 Property Owner: D/C 1717 Doolittle sub LLC Phone No.: (310) 444-5550 Designated Contact: Adrian Comstock Phone No.: (310) 444-5550 Mailing Address: 1801 Century Park East, Suite 1095, Los Angeles CA 90067 The property contains three (6) bioretention area(s), located as described below and as shown in the attached site plan'. • Bioretention Area No. 1 is located at the northwest corner of the property, along Aurora Street. • Bioretention Area No. 2 is located at the southeast corner of the property along Williams Street • Bioretention Area No. 3 is located at the South side of the lot along Williams Street. • Bioretention Area No. 4 is located at the South side of the lot along Williams Street. • Bioretention Area No. 5 is located at the Southwest corner of the lot along Aurora Street. • Bioretention Area No. 6 is located at the West side of the lot along Aurora Street. 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. events 2 Inspect bioretention area to ensure that it drains between Monthly, or as needed after storm storms. 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. 1 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 I appearance. 6 Inspect and, if needed, replace mulch before wet season As needed begins. Replace mulch when erosion is evident or when bioretention area looks unattractive. 7 Replace mulch over entire area every two to three years, Once every two to three years if needed. 8 Inspect bioretention area using the attached inspection Monthly, or after large storm events, checklist. and after removal of accumulated debris or material I I