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Your project contains various stormwater management features, including an infiltration <br /> facility, that were installed to mitigate the stormwater quantity and quality impacts of <br /> some or all of the impervious surfaces created by site construction. The size, <br /> placement, and design of these facilities, as depicted on the plans and design details, <br /> must be maintained and may not be changed without written approval from the City of <br /> Everett Public Works Department. <br /> Infiltration drywells are relatively simple facilities that allow stormwater to infiltrate into <br /> the ground through a rock-filled trench or hole. These should be inspected semi- <br /> annually for function and sediment accumulation. The drywell collects runoff through a <br /> series of storm drain pipes and catch basins, which can be looked into for water and <br /> sediment levels. The location of these facilities is shown on the project construction <br /> plans. <br /> The following pages describe in detail the maintenance parameters for these facilities. <br />