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EXHIBIT C <br />Subsurface Infiltration System Maintenance Plan for <br />1634 Brewster Ave, Parcel 2 <br />March 12, 2025 <br />Subsurface infiltration systems, also known as infiltration <br />galleries, are underground vaults or pipes that store and <br />infiltrate stormwaterstorage can take the form of large <br />diameterperfomted metal or plastic pipe, orconaete <br />arches, contrete vaults, plastic chambers or Gates. <br />Project Address and Cross Streets <br />1634 Brewster Ave Redwood City CA 94062 <br />Assessor's Parcel No. 052-235-140 <br />Property Owner: 1634 Brewster Ave Holding, LLC <br />Phone No.: 650-743-5908 <br />Designated Contact: Dan Lewin <br />Phone No.: 650-743-5908 <br />Mailing Address: 1634 Brewster Ave, Redwood City, CA 94062 <br />The property contains 1 subsurface infiltration system, located as described below and as shown in <br />the attached site plan. <br />Subsurface Infiltration System No. 1 is located in the front yard of the residence. <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 Activitiesfor Infiltration Trenches <br />No. <br />Maintenance Task <br />Frequency of Task <br />1 <br />Remove obstructions, debris and trash from subsurface <br />Monthly, or as needed after storm events <br />infiltration system and dispose of properly. <br />2 <br />Inspect system 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 />- <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 system has drained <br />Annually, during dry season <br />during dry season. <br />5 <br />Mow and trim vegetation around the system to maintain a neat <br />As needed <br />and orderly appearance. <br />6 <br />Remove any trash, grass clippings and other debris around <br />As needed <br />system and dispose of properly. <br />7 <br />check for erosion at inflow or bubbler structures. <br />As needed <br />8 <br />Confirm that cap of observation well is sealed. <br />At every inspection <br />9 <br />Inspect subsurface infiltration system using the attached <br />Monthly, or after large storm events, and after <br />inspection checklist. <br />removal of accumulated debris or material <br />REV: 07-10-26 MI <br />ATTY/AGR.2026.197/1634 Brewster Ave Holding, LLC (191 Grand St) (Page 12 of 14) <br />