Stormwater Management Manual 4-20 Eugene 2014 <br />• Rocks or Other Armoring shall be replaced when only one layer of rock exists above native soil. <br />• Sedimentation build-up near or exceeding 2” in depth shall be hand-removed with minimum damage to vegetation using proper erosion control measures. Sediment shall be removed if it is more than 4 inches thick or so thick as to damage or kill vegetation. <br />• Slopes shall be stabilized using appropriate measures when native soil is exposed. <br />• Vegetation shall be healthy and dense enough to provide filtering while protecting underlying soils from erosion. Dead vegetation shall be removed to maintain less than 10% of area coverage or when vegetative filter function is impaired. Vegetation shall be replaced immediately to control erosion where soils are exposed and within 3 months to maintain cover density. <br />Spill Prevention Measures shall be exercised on site when handling substances that contaminate stormwater. Releases of pollutants shall be corrected as soon as identified. <br />Non-Chemical Pest Control measures shall be taken to prevent development of insects, mosquitoes, and rodents.