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Flow Well Maintenance Plan <br />for 3247 Oak Knoll Drive <br />A Flow Well is a buried manhole type structure, <br />within an excavated area backfilled with a stone <br />aggregate, and lined with a filter fabric. Runoff is <br />stored in the void space between the stones and <br />Infiltrates through the bottom and into the soil <br />matrix. <br />April 27, 2021 <br />Project Address and Cross Streets <br />3247 Oak Knoll Drive/ Oak Knoll Drive <br />Assessor's Parcel No. 057-211-040 <br />Property Owner: Mr. Timothy Regan, Owner <br />Phone No.: (650) 260-2755 <br />Designated Contact: James E Thompson, JET Engineering <br />Phone No.: (650) 260-2755 <br />Mailing Address: 1048 EI Camino Real, STE C, RWC CA <br />The property contains twelve (12) Flow Well Infiltration Structures, located in the front and rear of the <br />property described below and 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 pollutant removal <br />efficiency and may lead to 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 Flow Wells <br />No. Maintenance Task Frequency of Task <br />Remove obstructions, debris and trash from the Flow Well area Monthly, or as needed after storm events <br />and dispose of properly. <br />2 Inspect Row Well to ensure that R drains between storms, f Monthly during wet season, or as needed after storm <br />and within 5 days after rainfall. Check observation well 2-3 events <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 the Flow Well has <br />Annually, during dry season <br />drained during dry season. <br />5 <br />Mow and trim vegetation around the Flow Well area to maintain <br />As needed <br />a neat and orderly appearance. <br />6 <br />Remove any trash, grass clippings and other debris around <br />As needed <br />the Flow Well Area and dispose of properly. <br />7 <br />Check for erosion at inflow or overflow structures. <br />As needed <br />At every inspection <br />8 <br />Confirm that cap of observation well is sealed. <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 21 of 23) <br />