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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 /> B Ponding Overflow/ Overflow spillway is partially or fully plugged Remove/dispose <br /> Area emergency spillway with sediment or debris. <br /> B Ponding Overflow/ Native soil is exposed or other signs of erosion Repair erosion and stabilize surface of <br /> Area emergency spillway damage are present. spillway <br /> B Ponding Overflow/emergency Spillway armament is missing. Replace armament <br /> Area spillway <br /> B Ponding Bioretention soil Water remains in the basin 48 hours or longer Ensure that under drain (if present) is not <br /> Area after the end of a storm. clogged. If necessary, clear under drain. If <br /> this is not the problem,the bioretention soil <br /> is likely clogged. Remove upper 2 to 3 <br /> inches of soil and replace with imported <br /> bioretention soil. Identify sources of <br /> clogging and correct. <br /> B Vegetation Bottom swale Less than 80%of swale bottom is covered with Plant additional vegetation. Ideally, planting <br /> vegetation healthy wetland vegetation. should be performed in the fall or winter. <br /> B Vegetation Upland slope Less than 70%of upland slopes are covered Plant additional vegetation. Ideally, planting <br /> vegetation with healthy vegetation. should be performed in the fall or winter. <br /> A Vegetation Trees and shrubs Large trees and shrubs interfere with operation Prune or remove large trees and shrubs <br /> of the basin or access for maintenance. <br /> A Vegetation Trees and shrubs Standing dead vegetation is present. Remove standing dead vegetation when <br /> covering greater than 10% of basin area. <br /> Replace dead vegetation annually or <br /> immediately if necessary to control erosion <br /> (e.g., on a steep slope). <br /> A Vegetation Mulch Bare spots(without much cover) are present or Replenish mulch to cover bare spots and <br /> mulch covers less than 3 inches deep for augment to minimum depth. <br /> compost or 4 inches deep for course woody <br /> mulch. <br /> As needed Vegetation Clippings Grass or other vegetation clippings accumulate Remove clippings <br /> to 2 inches or greater in depth. <br /> Appendices <br /> F-56 <br />