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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Date <br /> Drainage <br /> System Maintenance Activities and Conditions That <br /> Frequency Feature ✓ ✓ ✓ ✓ Problem Conditions to Check For Should Exist <br /> A General Tree Growth and Tree growth and dense vegetation which Trees and vegetation that does not hinder <br /> Dense Vegetation impedes inspection, maintenance access or inspection or maintenance activities. <br /> interferes with maintenance activity(i.e., slope Harvested trees should be recycled into mulch <br /> mowing, silt removal, vactoring, or equipment or other beneficial uses (e.g., alders for <br /> movements). firewood). <br /> A General Hazard Trees If dead, diseased, or dying trees are identified Remove hazard trees <br /> (Use a certified Arborist to determine health of <br /> tree or removal requirements) <br /> S General Performance Check crest gauge against design Record reading. Notify City if not meeting <br /> expectations(see maintenance plan) design performance. <br /> M Side Erosion Erosion damage over 2 inches deep where Slopes should be stabilized using appropriate <br /> Slopes of cause of damage is still present or where there erosion control measure(s); e.g., rock <br /> Pond is potential for continued erosion. reinforcement, planting of grass, compaction. <br /> M, S Side Erosion Any erosion observed on a compacted berm If erosion is occurring on compacted berms a <br /> Slopes of embankment. licensed civil engineer should be consulted to <br /> Pond resolve source of erosion. <br /> M Storage Sediment Accumulated sediment that exceeds 10 Sediment cleaned out to designed pond shape <br /> Area percent of the designed pond depth unless and depth; pond reseeded if necessary to <br /> otherwise specified or affects inletting or control erosion. (If sediment contamination is <br /> outletting condition of the facility. a potential problem, sediment should be tested <br /> regularly to determine leaching potential prior <br /> to disposal.) <br /> M Storage Liner(If Applicable) Liner is visible and has more than three one- Liner repaired or replaced. Liner is fully <br /> Area fourth inch holes in it. covered. <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-4 <br />