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Infiltration Trench Maintenance Plan <br />for 3247 Oak Knoll Drive <br />April 27, 2021 <br />Project Address and Cross Streets <br />�'` "` - T 3247 Oak Knoll Drive/ Oak Knoll <br />..3..e- <br />Assessor's Parc 0 211-040 <br />'. .. 'fir •:FR, _ i 1• <br />r` Property Owner: Mr. Timothy Regan, Owner <br />- Phone No.: (650) 260-2755 <br />An infiltration trench is a long, narrow, excavated Designated Contact: James E Thompson, JET EngineerinE <br />trench backfilled with a stone aggregate, and lined Phone No.: (650) 260-2755 <br />with a filter fahric. Runoff is stored in the void space <br />between the stones and infiltrates through the Mailing Address: 1048 EI Camino Real, STE C, RWC CA <br />bottom and into the soil matrix. <br />The property contains seven (7 ) infiltration trenches, located on the subject property and as shown in <br />the attached site plan. <br />I. Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, which reduces pollutant removal <br />efficiency and may lead to trench failure. Routine maintenance activities, and the frequency at which they will be <br />conducted, are shown in Table 1. <br />Table 1 <br />Routine Maintenance Activities for Infiltration Trenches <br />No. Maintenance Task <br />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 Inspect trench to ensure that it drains between storms, and Monthly during wet season, or as needed after storm <br />within 5 days after rainfall. Check observation well 2-3 days events <br />3 <br />after storm to confirm drainage. <br />Inspect filter fabric for sediment deposits by removing a small <br />section of the top layer - <br />Annually <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 />Remove any trash, grass clippings and other debris along the <br />6 <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 />9 <br />Inspect Infiltration trench using the attached Inspection checklist. <br />Monthly, or after large storm events, and after removal <br />of accumulated debris or material <br />Page 1 <br />ATTY/AGR.2022.060/Timothy Regan (Page 18 of 23) <br />