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Infiltration Trench <br />Inspection and Maintenance Checklist <br />Property Address: 430 Hillcrest Drive, Redwood City, CA 94062 Property Owner: Sirnin Dong and Weibin Chen <br />Treatment Measure No.: Date of Inspection: _ Type of Inspection: ❑ Monthly ❑ Pre -Wet Season <br />insoectcTW; <br />❑ After heavy runoff ❑ End of Wet Season <br />n nthar- <br />Defect <br />Conditions When Maintenance Is Needed <br />Maintenance <br />comments (Describe maintenance <br />Results Expected When Maintenance Is <br />Needed? (Y/N) <br />completed and if needed maintenance was <br />Performed <br />not conducted, note when it will be done) <br />1. Standing Water <br />When water stands in the infiltration trench <br />There should be no areas of standing <br />between storms and does not drain within 5 <br />water once inflow has ceased. Any of the <br />days after rainfall. <br />I following may apply: sediment or trash <br />blockages removed, improved grade from <br />head to foot of infiltration trench, <br />removed clogging at check dams, or <br />added underdrains. <br />2. Trash and Debris <br />Trash and debris accumulated in the <br />Trash and debris removed from <br />Accumulation <br />infiltration trench. <br />Infiltration trench and disposed of <br />properly. <br />3. Sediment <br />Evidence of sedimentation in trench. Less <br />Material removed and disposed of <br />than 50% storage volume remaining in <br />properly so that there is no clogging or <br />sediment traps, forebays or pretreatment <br />blockage. <br />swales. <br />4. Inlet/Outlet <br />Inlet/outlet areas clogged with sediment or <br />Material removed and disposed of <br />debris, and/or eroded. <br />properly so that there is no clogging or <br />blockage in the inlet and outlet areas, <br />5. Overflow <br />Clogged with sediment or debris, and/or <br />Material removed and disposed of <br />Spillway <br />eroded. <br />properly so that there is no clogging or <br />blockage, and trench is restored to design <br />condition, <br />6. Filter Fabric <br />Annual inspection, by removing a small <br />Replace filter fabric, as needed, to restore <br />section of the top layer, shows sediment <br />infiltration trench to design condition. <br />accumulation that may lead to trench failure. <br />7. Observation Well <br />Routine monitoring of observation well <br />Restore trench to design conditions, <br />indicates that trench is not draining within <br />Observation well cap is sealed, <br />specified time or observation well cap is <br />missing. <br />8. Miscellaneous <br />Any condition not covered above that needs <br />Meet the design specifications. <br />attention in orderforthe infiltration trench <br />to function as designed, <br />Infiltration Trench Maintenance Plan - Page 3 <br />ATTY/AGR,2024,002/Weibin Chen and Si Min Dong (430 Hillcrest Dr) (Page 14 of 17) <br />