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6. 1. F. - Page 109 EXHIBIT I'C" Bioretention Area (including Bioretention Swale) Maintenance Plan for One Marina — Phase 1 August 2011 Project Address and Cross Streets 630 Bair Island Road, Redwood City, CA Assessor's Parcel No.: 052 -531 -140 Property Owner: RC Peninsula Park, LLC Phone No.: 303 - 371 -9000 Designated Contact: Matt Salmon Phone No.: 510- 453 -0312 Bioretention areas function as soil and plant - based filtration devices that remove pollutants Mailing Address: St. Paul Street, Suite 300 through a variety of physical, biological, and chemical treatment processes. These facilities Denver CO 80206 normally consist of a grass buffer strip, sand bed, ponding area, organic layer or mulch layer, planting soil, and plants. The property contains 7 bioretention area(s), located as described below and as shown in the attached site plan'. • Bloretention Areas No. 1 and No. 2 are located along the western side of One Marina Way. • Bioretention Areas No. 3 and No. 4 are located along the eastern side of One Marina Way. • Bioretention Areas No. 5 through 7 are located behind the lower retaining wall along Bair Island Road. 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 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. 6 Check that mulch is at appropriate depth (3 inches per soil Monthly specifications) and replenish as necessary before wet season begins. Attached site plan must match the site plan exhibit to Maintenance Agreement. Page 1 NDS Approved 1215107 VAMIMIOIMO LU.©.Ve.IslitslSORmwal.r OAM Age.— MMIIBI CP Mvirn_94 -i A.J&hlChehli—