7800 EVERGREEN WAY HYUNDAI O&M Manual 2025-04-28

: ► ► � � isIII] I [I] 1:1 M ► I M If sediment or debris is observed in any of these structures, you should determine the depth of the material. This is typically accomplished with a stadia rod, but you should determine the best way to obtain the measurement. All observations and measurements should be recorded on an Inspection Log kept on file. We've included a form you can use at the end of this guideline. Maintenance The R-Tank System should be back-flushed once sediment accumulation has reached 6"or 15%of the total system height. Use the chart below as a guideline to determine the point at which maintenance is required on your system. R-Tank Unit Height Max Sediment Dept Mini 9.5" 1.5" Single 17" 3" Double 34" 5" Triple 50" 6" Quad 67" 6" Pent 84" 6" Before any maintenance is performed on your system, be sure to plug the outlet pipe to prevent contamination of the adjacent systems. To back-flush the R-Tank,water is pumped into the system through the Maintenance Ports as rapidly as possible. Water should be pumped into ALL Maintenance Ports. The turbulent action of the water moving through the R-Tank will suspend sediments which may then be pumped out. If your system includes an Outlet Structure, this will be the ideal location to pump contaminated water out of the system. However, removal of back-flush water may be accomplished through the Maintenance Ports, as well. For systems with large footprints that would require extensive volumes of water to properly flush the system, you should consider performing your maintenance within 24 hours of a rain event. Stormwater entering the system will aid in the suspension of sediments and reduce the volume of water required to properly flush the system. Once removed, sediment-laden water may be captured for disposal or pumped through a DirtbagTM (if permitted by the locality). A ar® 2831 Cardwell Road Richmond,Virginia,23234 800.448.3636 ENVIRONMENTAL FAX 804.743.7779 LET'S GET IT DONE acfenvironmental.com