Orange County NC Website
15 <br /> Maintenance <br /> Depending on the configuration of the particular system, <br /> maintenance personnel will be required to enter the vault to <br /> perform the maintenance. <br /> Important: If vault entry is required, OSHA rules for confined <br /> space entry must be followed. <br /> Filter cartridge replacement should occur during dry weather. <br /> It may be necessary to plug the filter inlet pipe if base flows is <br /> occurring. <br /> Replacement cartridges can be delivered to the site or customers <br /> facility. Information concerning how to obtain the replacement - <br /> cartridges is available from Contech Engineered Solutions. <br /> Warning: In the case of a spill,the maintenance personnel <br /> should abort maintenance activities until the proper guidancek <br /> is obtained. Notify the local hazard control agency and ; . <br /> Contech Engineered Solutions immediately. ry. <br /> To conduct cartridge replacement and sediment removal <br /> maintenance: <br /> 1. If applicable, set up safety equipment to protect maintenance <br /> personnel and pedestrians from site hazards. <br /> 2. Visually inspect the external condition of the unit and take <br /> notes concerning defects/problems. <br /> 3. Open the doors(access portals)to the vault and allow the ^•:_ <br /> system to vent. <br /> 4. Without entering the vault, give the inside of the unit, Important:Care must be used to avoid damaging the <br /> including components, a general condition inspection. cartridges during removal and installation.The cost of <br /> 5. Make notes about the external and internal condition of repairing components damaged during maintenance will be <br /> the vault. Give particular attention to recording the level of the responsibility of the owner. <br /> sediment build-up on the floor of the vault, in the forebay, C. Set the used cartridge aside or load onto the hauling <br /> and on top of the internal components. truck. <br /> 6. Using appropriate equipment offload the replacement <br /> cartridges(up to 150 lbs. each)and set aside. D. Continue steps a through c until all cartridges have been <br /> 7. Remove used cartridges from the vault using one of the removed. <br /> following methods: <br /> Method 2: <br /> Method 1: A. This activity will require that maintenance personnel enter <br /> A. This activity will require that maintenance personnel enter the vault to remove the cartridges from the under drain <br /> the vault to remove the cartridges from the under drain manifold and place them under the vault opening for <br /> manifold and place them under the vault opening for lifting (removal). Disconnect each filter cartridge from the <br /> lifting (removal). Disconnect each filter cartridge from the underdrain connector by rotating counterclockwise 1/4 of <br /> underdrain connector by rotating counterclockwise 1/4 of a turn. Roll the loose cartridge, on edge,to a convenient <br /> a turn. Roll the loose cartridge, on edge,to a convenient spot beneath the vault access. <br /> spot beneath the vault access. B. Unscrew the cartridge cap. <br /> Using appropriate hoisting equipment, attach a cable C. Remove the cartridge hood and float. <br /> from the boom, crane, or tripod to the loose cartridge. <br /> Contact Contech Engineered Solutions for suggested D. At location under structure access,tip the cartridge on its <br /> attachment devices. side. <br /> B. Remove the used cartridges(up to 250 lbs. each)from the E. Empty the cartridge onto the vault floor. Reassemble the <br /> vault. empty cartridge. <br /> F Set the empty, used cartridge aside or load onto the <br /> hauling truck. <br /> G. Continue steps a through a until all cartridges have been <br /> removed. <br />