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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Date <br /> Drainage <br /> System Maintenance Activities and Conditions <br /> Frequency Feature ✓ ✓ ✓ ✓ Problem Conditions to Check For That Should Exist <br /> S General Performance Check crest gauge against design expectations Record reading. Notify City if not meeting <br /> (see maintenance plan) design performance. <br /> M Storage Water Not Infiltrating Water ponding in infiltration pond after rainfall Sediment is removed and/or facility is <br /> Area ceases and appropriate time allowed for cleaned so that infiltration system works <br /> infiltration (24 hours or design infiltration time). according to design. <br /> (A percolation test pit or test of facility indicates <br /> facility is only working at 90 percent of its <br /> designed capabilities. If 2 inches or more <br /> sediment is present, remove). <br /> M Filter Bags Filled with Sediment Sediment and debris fill bag more than one-half Filter bag is replaced or system is <br /> (if and Debris full. redesigned. <br /> applicable) <br /> M'S Rock Filters Sediment and By visual inspection, little or no water flows Gravel in rock filter is replaced. <br /> Debris through filter during heavy rain storms. <br /> A,S Trenches Observation Well Water ponds at surface during storm events. Remove and Replace/Clean rock and <br /> (Use surface of Less than 90 percent of design infiltration rate. geomembrane. <br /> trench if well is not <br /> present) <br /> M Ponds Vegetation Exceeds 18 inches. Mow <br /> M Ponds Vegetation Bare spots. Revegetate and stabilize immediately. <br /> M Side Slopes Erosion Erosion damage over 2 inches deep where Slopes should be stabilized using appropriate <br /> of Pond cause of damage is still present or where there erosion control measure(s); e.g., rock <br /> is potential for continued erosion. reinforcement, planting of grass, compaction. <br /> A Pond Settlements Any part of berm which has settled 4 inches Dike is built back to the design elevation. <br /> Berms lower than the design elevation. If settlement is <br /> (Dikes) apparent, measure berm to determine amount <br /> of settlement. Settling can be an indication of <br /> more severe problems with the berm or outlet <br /> works.A licensed civil engineer should be <br /> consulted to determine the source of the <br /> settlement. <br /> Appendices <br /> F-7 <br />