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• <br /> y <br /> CITY OF EVERETT STORMWATER MANAGEMENT MANUAL * , <br /> Vortechs Stormwater Treatment System. <br /> Also check DOE website and manufacturer guidelines for updates to O&M requirements. <br /> Date <br /> Drainage <br /> - <br /> System <br /> Frequency Feature I I I ✓ Problem Maintenance Activities and Conditions <br /> M,S Conditions to Check For That Should Exist <br /> General Sediment Sediment depth is within 6 inches of dry <br /> accumulation weather water surface elevation. Accumulated sediment should be removed. <br /> M,S General Trash and Debris Trash and debris accumulated in vault,or pipe Trash and debris removed from vault,and <br /> Accumulation inlet/outlet,floatables and non-floatables. inlet/outlet piping. <br /> M,S General Oil Accumulation Oil accumulation that exceeds 1 inch at the Oil is extracted from vault using vectoring <br /> water surface. methods.Coalescing plates are cleaned by <br /> thoroughly rinsing and flushing.Should be no <br /> A Structure Damaged Pipes Inlet or outlet piping damaged or broken and in Pipe repaireddepand or replaced. <br /> need of repair. <br /> A Structure <br /> Baffles Baffles corroding,cracking,warping and/or Baffles repaired or replaced to specifications. <br /> showing signs of failure as determined by <br /> A maintenance/inspection person. <br /> Structure Vault Structure Cracks wider than one-half inch or evidence of Vault replaced or repairs made so that vault <br /> Damage-Includes soil particles entering the structure through the meets design specifications, is structurally <br /> Cracks in Walls, cracks,including Inlet/outlet pipe joints, sound,and no cracks greater than one-fourth <br /> Bottom, Damage to maintenance or inspection personnel determine inch exist at the inlet/outlet pipe joints <br /> Frame and/or Top that the vault is not structurally sound. <br /> Slab <br /> If you are unsure whether a problem exists,please contact a professional engineer. <br /> A vault is a confined space. Visual inspections should be performed aboveground. If entry is required it should be performed by qualified <br /> personnel. <br /> Key: <br /> A=Annual (March or April preferred) <br /> M=Monthly(see schedule) <br /> S=After major storms (use 1 inch in 24 hours as a guideline) <br /> Appendices <br /> F47 <br />