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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 /> A Pond Piping Discernable water flow through pond berm. Piping eliminated. Erosion potential <br /> Berms Ongoing erosion with potential for erosion to eliminated. <br /> (Dikes) continue. (Recommend a Geotechnical <br /> engineer be called in to inspect and evaluate <br /> condition and recommend repair of condition. <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 /> 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 <br /> mowing, silt removal, vactoring, or equipment mulch or other beneficial uses(e.g., alders <br /> movements). for firewood). <br /> A Pond Tree Growth Tree growth on berms over 4 feet in height may Trees should be removed. if root system is <br /> Berms lead to piping through the berm which could small (base less than 4 inches)the root <br /> (Dikes) lead to failure of the berm. system may be left in place. Otherwise the <br /> roots should be removed and the berm <br /> restored. A licensed civil engineer should be <br /> consulted for proper berm/spillway <br /> restoration. <br /> A Emergency Tree Growth Tree growth on emergency spillways creates Trees should be removed. If root system is <br /> Overflow/ blockage problems and may cause failure of small (base less than 4 inches)the root <br /> Spillway the berm due to uncontrolled overtopping. system may be left in place. Otherwise the <br /> roots should be removed and the berm <br /> restored. A licensed civil engineer should be <br /> consulted for proper berm/spillway <br /> restoration. <br /> A Emergency Rock Missing Only one layer of rock exists above native soil Rocks and pad depth are restored to design <br /> Overflow/ in area 5 square feet or larger, or any exposure standards. <br /> Spillway of native soil at the top of outflow path of <br /> spillway. <br /> (Riprap on inside slopes need not be replaced.) <br /> Appendices <br /> F-8 <br />