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The oil/sediment separator unit must be a "Stormceptor®" model manufactured by Rinker Materials or other approved unit.
The separator must remove oil and sediment from storm water during frequent wet weather events. It should treat a minimum of 75 to 90 percent of the annual runoff volume and be capable of removing 50 to 80 percent of the total suspended sediment load as well as more than 90 percent of floatable free oil. The separator should be capable of trapping silt and clay size particles, in addition to large particles. It should be installed underground as part of the storm sewer system and be structurally designed for (HS-20 min.) traffic loading at the surface, with the storage in the separator vertically oriented. The separator should be maintained from the surface via one access point.
The separator should be equipped with an internal high flow bypass that regulates the flow rate into the treatment chamber and conveys high flows directly to the outlet so the scour and/or re-suspension of material previously collected in the separator does not occur. External bypasses are not acceptable. The bypass area must be physically separated from the separation area to prevent mixing with the separator circular and constructed from either fiberglass or precast concrete risers. The concrete separator is designed and manufactured in accordance with ASTM C-478. The concrete joints are oil resistant, water tight and meet the design criteria according to ASTM C-443. In the concrete Stormceptor®, a fiberglass insert, bolted and sealed watertight to the inside of the bypass chamber, will divert low to normal storm water flows into the treatment chamber. A minimum of 12 inches of oil storage should be lined with fiberglass to provide secondary containment of any hydrocarbon materials.
The difference between the separator inlet pipe elevation and the separator outlet pipe elevation must be 1 inch (25 mm). For a multiple inlet pipes or inlet designs a 3-inch (75 mm) difference between horizontal inlet pipe inverts and the outlet pipe invert should occur. The separator will be able to be used as a bend structure in the storm sewer system. The access cover for all non-inlet type separators should clearly indicate that it is an oil/sediment separator.
The separator must be capable of capturing floatable substance spills including free oil and must not be compromised by temporary backwater conditions (i.e., trapped pollutants should not be re-suspended and scoured from the separator during backwater conditions). The capabilities of the selected separator must be documented with scientific studies and reports. Preference will be given to devices that have been verified by a state or federal storm water verification program.
For more information, contact Stormceptor at 800.909.7763.