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se Oil gm <br /> 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 Below Vault structure has Cracks wider than one-half inch or evidence of Vault repaired or replaced so that vaults <br /> ground cracks in wall, soil particles entering the structure through the meets design specifications and is <br /> vault bottom,and damage cracks,or maintenance/inspection personnel structurally sound. <br /> to frame and/or top determine that the vault is not structurally <br /> slab. sound. <br /> A Below Vault structure has Cracks wider than 0.5 inch at the joint of any Vault repaired so that no cracks exist wider <br /> ground cracks in wall, inlet/outlet pipe or evidence of soil particles than 0.25 inch at the joint of inlet/outlet pipe.. <br /> vault bottom,and damage entering through the cracks <br /> to frame and/or top <br /> slab. <br /> A Below Baffles Baffles corroding,cracking,warping, and/or Baffles repaired or replaced to design <br /> ground showing signs of failure as determined by specifications. <br /> vault maintenance/inspection person <br /> A Below Ladder rungs unsafe Maintenance person judges that ladder is Ladder meets design standards and allows <br /> ground unsafe due to missing rungs,misalignment, maintenance persons safe access. <br /> vault rust,or cracks. Ladder must be fixed or <br /> secured immediately. <br /> S Below Compost Media Drawdown of water through the media takes Media cartridges replaced. <br /> Ground longer than 1 hour,and/or overflow occurs <br /> Cartridge frequently. <br /> Type <br /> S Below Short Circuiting Flows do not properly enter filter cartridges. Filter cartridges replaced. <br /> Ground <br /> Cartridge <br /> Type <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 /> (M) Monthly from October through April. <br /> (A) Once in late summer(preferably September) <br /> (S) After any major storm(use 1 inch in 24 hours as a guideline). <br /> Appendices <br /> Everett Mall Plaza Parcel III Retail Expansion Stormwater Site Plan Page 83 <br /> I � ! <br />