6101 ASSOCIATED BLVD BASE FILE 2017-06-05

Maintenance near this level throughout pumping as the bottom and sides The Vortechs system should be inspected at regular intervals and of the swirl chamber are sealed to the tank floor and walls. This"water lock"feature prevents water from migrating into maintained when necessary to ensure optimum performance. The rate at which the system collects pollutants will depend more the swirl chamber,exposing the bottom of the baffle wall and heavily on site activities than the size of the unit,e.g., unstable creating excess pump-out volume. Floating pollutants will decant soils or heavy winter sanding will cause the swirl chamber to fill into the swirl chamber as the water level is drawn down.This more quickly but regular sweeping will slow accumulation. allows most floating material to be withdrawn from the same access point above the swirl chamber. Floating material that Inspection does not decant into the swirl chamber during draw down Inspection is the key to effective maintenance and is easily should be skimmed from the baffle chamber. If maintenance performed. Pollutant deposition and transport may vary from is not performed as recommended,sediment may accumulate year to year and regular inspections will help ensure that the outside the swirl chamber. If this is the case, it may be necessary system is cleaned out at the appropriate time. Inspections should to pump out other chambers. It is advisable to check for be performed twice per year(i.e.spring and fall)however more sediment accumulation in all chambers during inspection and frequent inspections may be necessary in equipment washdown maintenance. areas and in climates where winter sanding operations may lead These maintenance recommendations apply to all Vortechs to rapid accumulations. It is useful and often required as part of systems with the following exceptions: a permit to keep a record of each inspection.A simple inspection and maintenance log form for doing so is provided on the 1. It is strongly recommended that when cleaning systems larger following page, and is also available on contechstormwater.com. than the Model 16000 the baffle chamber be drawn down to depth of three feet prior to beginning clean-out of the The Vortechs system should be cleaned when inspection reveals swirl chamber. Drawing down this chamber prior to the swirl that the sediment depth has accumulated to within 12 to 18 inches(300 to 450 mm)of the dry-weather water surface chamber reduces adverse structural forces pushing upstream on the swirl chamber once that chamber is empty_ elevation.This determination can be made by taking two measurements with a stadia rod or similar measuring device; 2. Entry into a Vortechs system is generally not required as one measurement from the manhole opening to the top of the cleaning can be done from the ground surface. However, sediment pile and the other from the manhole opening to the if manned entry into a system is required the entire system water surface. Note: To avoid underestimating the volume of should be evacuated of water prior to entry regardless of the sediment in the chamber,the measuring device must be carefully system size. lowered to the top of the sediment pile. Finer,silty particles at the Manhole covers should be securely seated following cleaning top of the pile typically offer less resistance to the end of the rod activities to prevent leakage of runoff into the system from than larger particles toward the bottom of the pile. above and also to ensure proper safety precautions. If anyone physically enters the unit, Confined Space Entry procedures need Cleaning to be followed. Cleaning of the Vortechs system should be done during dry Disposal of all material removed from the Vortechs system should weather conditions when no flow is entering the system. Clean- be done in accordance with local regulations. In many locations, out of the Vortechs system with a vacuum truck is generally the most effective and convenient method of excavating pollutants disposal of evacuated sediments may be handled in the same from the system. If such a truck is not available,a "clamshell" manner as disposal of sediments removed from catch basins or grab may be used, but it is difficult to remove all accumulated deep sump manholes. Check your local regulations for specific pollutants using a "clamshell". requirements on disposal. In installations where the risk of petroleum spills is small, liquid For assistance with maintaining your Vortechs system, contact us contaminants may not accumulate as quickly as sediment. regarding the CONTECH Maintenance Compliance Certification However,an oil or gasoline spill should be cleaned out Program. immediately. Motor oil and other hydrocarbons that accumulate on a more routine basis should be removed when an appreciable layer has been captured.To remove these pollutants, it may be preferable to use adsorbent pads to solidify the oil since these pads are usually much easier to remove from the unit individually and less expensive to dispose of than the oil/water emulsion that .. may be created by vacuuming the oily layer. Floating trash can be it netted out if you wish to separate it from the other pollutants. Cleaning of a Vortechs system is typically done by inserting S a vacuum hose into the swirl chamber and evacuating this chamber of water and pollutants.As water is evacuated,the water level outside of the swirl chamber will drop to a level roughly equal to the crest of the lower aperture of the swirl chamber.The water outside the swirl chamber should remain 6