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Exhibit C <br />Inspection and Maintenance Checklist <br />Infiltration Trench Maintenance Plan for <br />1721 Virginia Avenue <br />July 3, 2024 <br />Project Address: <br />1721 Virginia Avenue <br />Assessor's Parcel No. 069-103-040 <br />Property Owner: Thomas James Homes <br />Phone No.: (650) 434-7966 <br />Contact: Ken King <br />Phone No.: (650) 434-7966 <br />Mailing Address: 275 Shoreline Drive, Suite 400 <br />Redwood City, CA 94065 <br />The property contains 1 storage pipe(es), located as described below and as shown in the attached site <br />plan. <br />• Infiltration Trench No. 1 is located at the western area of the property (front left). <br />Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, which reduces pollutant <br />removal efficiency and may lead to trench failure. Routine maintenance activities, and the frequency at which <br />they will be conducted, are shown in Table 1. <br />Table 1 <br />Routine Maintenance Activities for Infiltration Trenches <br />No. <br />Maintenance Task <br />Frequency of Task <br />1 <br />Remove obstructions, debris and trash from infiltration trench and dispose of <br />Monthly, or as needed after storm <br />properly. <br />events <br />2 <br />Inspect trench to ensure that it drains between storms, and within 5 days <br />Monthly during wet season, oras <br />after rainfall. Check observation well 2-3 days after storm to confirm <br />needed after storm events <br />drainage. <br />3 <br />Inspect filter fabric for sediment deposits by removing a small section of the top <br />Annually <br />layer. <br />4 <br />Monitor observation well to confirm that trench has drained during dry season. <br />Annually, during dry season <br />5 <br />Mow and trim vegetation around the trench to maintain a neat and orderly <br />As needed <br />appearance. <br />6 <br />Remove anytrash, grass clippings and other debris alongthe trench perimeter <br />As needed <br />and dispose of properly. <br />7 <br />Checkfor erosion at inflow or overflow structures. <br />As needed <br />8 <br />Confirm that cap of observation well is sealed. <br />At every inspection <br />9 <br />Inspect system using the attached inspection checklist. <br />Monthly, or after large storm events, <br />and after removal of accumulated <br />debris or material <br />Page 1 <br />ATTY/AGR.2025.180/SF21 G, LLC (1721 Virginia Ave) (Page 14 of 16) <br />Updated 1/1/20 <br />