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Exhibit C <br />Inspection and Maintenance Checklist <br />Infiltration Trench Maintenance Plan <br />Project Address: 3622 Glenwood Ave., Redwood City, CA <br />The property contains one infiltration trench, located as shown in the attached site plan. <br />I. Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, which reduces <br />pollutant removal efficiency and may lead to trench failure. Routine maintenance activities, and <br />the frequency at which they will be conducted, are shown in Table 1. <br />II. Prohibitions <br />Trees and other large vegetation shall be prevented from growing adjacent to the trench to <br />prevent damage. <br />III. Mosquito Abatement <br />Standing water shall not remain in the treatment measures for more than five days, to prevent <br />mosquito generation. Should any mosquito issues arise, contact the San Mateo County <br />REV: 02-17-26 VR <br />ATTY/AGR.2026.041/Lucio Flores Sanchez and Maria J. Garcia-Acosta(3079 Page St) (Page 12 of 14) <br />Table 1 Routine Maintenance Activities <br />for Infiltration Trenches <br />1 <br />Remove obstructions, debris and trash <br />Monthly, or as needed after <br />from infiltration trench and dispose of <br />storm events <br />properly. <br />Monthly during wet season, <br />2 Inspect trench to ensure that it drains <br />between storms, and within 5 days <br />or as needed after storm <br />after rainfall. Check observation well 2- <br />events <br />3 days after storm to confirm drainage, <br />3 <br />Inspect filter fabric for sediment <br />Annually <br />deposits by removing a small section <br />of the top layer. <br />Annually, during dry season <br />4 Monitor observation well to confirm that <br />trench has drained during dryseason. <br />As needed <br />_ <br />5 Mow and trim vegetation around the <br />trench to maintain a neat and orderly <br />appearance. <br />6 <br />Remove any trash, grass clippings and <br />As needed <br />other debris along the trench perimeter <br />and dispose of properly. <br />7 <br />Check for erosion at inflow or overflow <br />As needed <br />structures. J- <br />8 <br />_ <br />Confirm that cap of observation well is <br />At every inspection <br />_ <br />sealed. <br />Monthly, or after large storm <br />9 Inspect infiltration trench using the <br />attached inspection <br />events, and after <br />checklist. <br />removal of accumulated <br />debris or material <br />II. Prohibitions <br />Trees and other large vegetation shall be prevented from growing adjacent to the trench to <br />prevent damage. <br />III. Mosquito Abatement <br />Standing water shall not remain in the treatment measures for more than five days, to prevent <br />mosquito generation. Should any mosquito issues arise, contact the San Mateo County <br />REV: 02-17-26 VR <br />ATTY/AGR.2026.041/Lucio Flores Sanchez and Maria J. Garcia-Acosta(3079 Page St) (Page 12 of 14) <br />