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Bioretention Area' Maintenance Plan for <br />2001 WILLIAMS STREET, SAN LEANDRO <br />6/9/2017 <br />Project Address and Cross Streets 2001 Williams Street San Leandro CA <br />Assessor's Parcel No.: 077A-0700-022-00 <br />Property Owner: DCT Williams Street LLC Phone No.: <br />Designated Contact: Terri Allen Phone No.: (949) 219-1242 <br />Mailing Address: 12 Corporate Plaza, Suite 150, Newport Beach, CA 92660 <br />The property contains 8 bioretention area(s), located as described below and as shown in <br />the attached site plane. <br />■ Bioretention Area No. 1 is located near the southeast corner of the building. <br />■ Bioretention Area No. 2 is located near the southwest corner of the building. <br />■ Bioretention Area No. 3 is located near the northeast corner of the building. <br />■ Bioretention Area No. 4 is located north of the building and west of Bioretention Area No. 3. <br />■ Bioretention Area No. 5 is located north of the building and west of Bioretention Area No. 4. <br />■ Bioretention Area No. 6 is located west of the building. <br />■ Bioretention Area No. 7A is located near the northwest corner of the building and east of the <br />main entry. <br />■ Bioretention Area No. 76 is located near the northwest corner of the building and west of the <br />main entry. <br />I. Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, which <br />reduces pollutant removal efficiency and may lead to bioretention area failure. Routine <br />maintenance activities, and the frequency at which they will be conducted, are shown in <br />Table 1. <br />Table 1 <br />Routine Maintenance Activities for Bioretention Areas <br />No. <br />Maintenance Task <br />Frequency of Task <br />1 <br />Remove obstructions, debris and trash from bioretention <br />Monthly, or as needed after storm events <br />area and dispose of properly. <br />2 <br />Inspect bioretention area to ensure that it drains between <br />Monthly, or as needed after storm events <br />storms and within five days after rainfall. <br />3 <br />Inspect inlets for channels, soil exposure or other <br />Monthly, or as needed after storm events <br />evidence of erosion. Clear obstructions and remove <br />sediment. <br />4 <br />Remove and replace all dead and diseased vegetation. <br />Twice a year <br />5 <br />Maintain vegetation and the irrigation system. Prune and <br />Before wet season begins, or as needed <br />weed to keep bioretention area neat and orderly in <br />appearance. <br />6 <br />Check that mulch is at appropriate depth (3 inches per soil <br />Monthly <br />specifications) and replenish as necessary before wet <br />season begins. <br />7 <br />Inspect bioretention area using the attached inspection <br />Monthly, or after large storm events, and after <br />checklist. <br />removal of accumulated debris or material <br />' 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 />-' Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page 1 NDS Approved Template Revised 11/28/11 <br />