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EXHIBIT C <br />Infiltration Trench Maintenance Plan for <br />[Dong Residence] <br />7/17/2023 <br />An infiltration trench is a long, narrow, excavated <br />trench backfilled with a stone aggregate, and lined with <br />a filter fabric. Runoff is stored in the void space <br />between the stones and infiltrates through the bottom <br />and into the soil matrix. <br />Project Address and Cross Streets <br />430 Hillcrest Drive Redwood CitV, CA 94062 <br />and Lancaster Way <br />Assessor's Parcel No. 058-302-080 <br />Property owner: Simin Dong and Weibin Chen <br />Phone No.: 408-368-1681 <br />Designated Contact: Simin Dong <br />Phone No.: 408-386- 1681 <br />Mailing Address: 454 Patricia Ct, Milpitas, CA 95035 <br />The property contains [[== insert number==]] infiltration trench(es), located as described below and <br />as shown in the attached site plan. <br />■ Infiltration Trench No. 1 is located at [[== describe location <br />■ [[== Add descriptions of other infiltration trenches, if applicable. ==]] <br />I. 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. Maintenance Task Frequency of Task <br />1 Remove obstructions, debris and trash from infiltration trench Monthly, or as needed after storm events <br />and dispose of properly. <br />2 <br />Inspect trench to ensure that it drains between storms, and <br />Monthly during wet season, or as needed after storm <br />within 5 days after rainfall. Check observation well 2-3 days <br />events <br />after storm to confirm drainage. <br />3 <br />Inspect filter fabric for sediment deposits by removing a small <br />Annually <br />section of the top layer. <br />4 <br />Monitor observation well to confirm that trench has drained <br />Annually, during dry season <br />during dry season. <br />5 <br />Mow and trim vegetation around the trench to maintain a neat <br />As needed <br />and orderly appearance. <br />6 <br />Remove any trash, grass clippings and other debris along the <br />As needed <br />trench perimeter and dispose of properly. <br />7 <br />Check for 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 />Page 1 <br />ATTY/AGR.2024.082/Weibin Chen and Si Min Dong (430 Hillcrest Dr) (Page 12 of 17) <br />Updated 1/1/20 <br />