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Stormwater Quality Design Manual (May 2007) - City of Sacramento ...

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Run<strong>of</strong>f Reduction Control Measure Fact SheetInterceptor TreesLong-Term MaintenanceMaintenance recommendations for interceptor trees are provided in Table INT-2. The property owner isresponsible for all costs associated with the maintenance.Trees that are removed or die should be replaced with similar species, or all water quality benefits will belost. Trees should be properly pruned for safety purposes, to protect structures, or for the improvement <strong>of</strong>the health and structure <strong>of</strong> the tree. The property owner is responsible for all costs associated with thereplacement <strong>of</strong> interceptor trees.Table INT-2. Inspection and Maintenance Recommendations for Interceptor TreesActivityRemoval <strong>of</strong> Leavesand Debris:PruningMulchingIrrigationPesticides andFertilizersLawn maintenanceOther ActivitiesRemoval/ReplacementDescriptionFallen leaves and debris from tree foliage should be raked and removed regularly toprevent the material from being washed into the storm water. Nuisance vegetation aroundthe tree should be removed when discovered. Dead vegetation should be pruned from thetree on a regular basis.It is recommended that a certified arborist or similarly qualified pr<strong>of</strong>essional be retained toprune trees, or the property owner should learn proper pruning methods. A tree shouldnever be topped. Topping is the practice <strong>of</strong> removing major portions <strong>of</strong> a large tree’scrown by cutting branches to stubs or to the trunk. Tree topping shortens the life <strong>of</strong> thetree, creates weakly attached limbs prone to breakage, decay and disfigures the tree. Italso eliminates the interception canopy.Add 4-6 inch deep hardwood mulch around newly planted trees and shrubs (avoidredwood and cedar, it is light and blows away and does not decompose fast enough to bebeneficial to the soil health and tree's growth).An irrigation system should be installed at the time <strong>of</strong> planting and maintained during theestablishment period or, if necessary to maintain the tree, in perpetuity.Minimize the use <strong>of</strong> chemicals to only what is necessary to maintain the health <strong>of</strong> the tree.Consider using mulch around the base <strong>of</strong> the tree as a substitute to fertilizer. Do not placemulch within six inches <strong>of</strong> the trunk <strong>of</strong> the tree.Keep lawn at least 24 inches from trunk <strong>of</strong> tree.Competition from turfgrass stunts tree growth, and even additional fertilizer and water willnot overcome this effect. A bare area around the trunk also helps prevent injury to the treefrom a mower or string trimmer. Trunk wounds to a young tree can have a severe dwarfingeffect.Plant evergreen shrubs and ground covers around trees when possible. Care should betaken when digging near tree roots. Once tree has become established, planting <strong>of</strong>vegetation near base <strong>of</strong> tree and subsequent watering <strong>of</strong> such vegetation may result inover-saturation and damage to the tree.See Long-term Maintenance<strong>Stormwater</strong> <strong>Quality</strong> <strong>Design</strong> <strong>Manual</strong> for the <strong>Sacramento</strong> and South Placer Regions<strong>May</strong> <strong>2007</strong>INT-5

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