6201 ASSOCIATED BLVD BASE FILE 2018-03-29

Maintenance near this level throughout pumping as the bottom and sides The Vdr'techs system should be inspected at regular intervals and of the swirl chamber are sealed to the tank floor and walls. maintained when necessary to ensure optimum performance. This"water lock"feature prevents water from migrating into 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swirl chamber to fill into the swirl chamber as the water level is drawn down.This allows most floating material to be withdrawn from the same more quickly but regular sweeping will slow accumulation. 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 outside the swirl chamber. If this is the case, it may be necessary year to year and regular inspections will help ensure that the 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 chamber reduces adverse structural forces pushing upstream inches(300 to 450 mm)of the dry-weather water surface on the swirl chamber once that chamber is empty. • elevation.This determination can be made by taking two 2. Entry into a Vortechs system is generally not required as measurements with a stadia rod or similar measuring device; 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 should be evacuated of water prior to entry regardless of the water surface. Note: To avoid underestimating the volume of 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 above and also to ensure proper safety precautions. If anyone than larger particles toward the bottom of the pile. 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- out of the Vortechs system with a vacuum truck is generally the be done in accordance with local regulations. In many locations, 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 requirements on disposal. pollutants using a "clamshell". In installations where the risk of petroleum spills is small, liquid For assistance with maintaining your Vortechs system, contact us regarding the CONTECH Maintenance Compliance Certification contaminants may not accumulate as quickly as sediment. 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 individuallyr and less expensive to dispose of than the oil/water emulsion that -.- -" is maybe created byvacuumingthe oilylayen Floatingtrash can be h T Y I it (; �l netted out if you wish to separate it from the other pollutants. � G I f Cleaning of a Vortechs system is typically done by inserting I i' i , -J+ , a vacuum hose into the swirl chamber and evacuating this :' �i chamber of water and pollutants. As water is evacuated, the 1, a r, n water level outside of the swirl chamber will drop to a level roughly equal to the crest of the lower aperture of the swirl J I. chamber.The water outside the swirl chamber should remain 6