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Oil Water Separators
Contamination of our water resources with hydrocarbons is an especially difficult problem to solve because of the widespread use of petroleum products. Oldcastle Precast offers two styles of oil water separators to intercept hydrocarbons in stormwater runoff, the generic baffled style for lower concentration areas and, for hydrocarbon “hot spots” we provide separators that use enhanced coalescing plate technology and gravitational separation to improve the separation process and reduce the frequency of maintenance and cleaning.
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Sandfilters
Sandfilters are proven technology that effectively remove pollutants from stormwater runoff after construction has been completed on a given site. Sandfilters are typically triple-chambered structures. The first chamber serves to pretreat the stormwater by allowing larger sediments to settle out and trapping some floatables. Pretreatment is critical in reducing maintenance frequency by removing some of the larger pollutants so that the filter bed will not become clogged quickly. The second chamber contains a filter bed comprised of sand, or other filter media that will filter out finer particles and other pollutants as the stormwater passes through the media. The third chamber is a clear well chamber for cleaned water prior to discharge. Each filter can be sized to match your application, thereby making best use of site conditions and providing best options for more efficient maintenance. Oldcastle offers both perimeter style (at grade) and underground sand filters. Our sandfilters feature a high-flow bypass option and comply with underground structure requirements. Most can be installed in one day.
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Typical pollutant percent removal rates for sandfilters listed by the U.S. EPA are:
TSS 65 - 90%
TP 40 - 85%
TN 44 - 47%
Metals 25 - 90+%
Bacteria 55%
Click here for U.S. EPA technical bulleting on sandfilters.
Proprietary Treatment Devices
Oldcastle Precast manufactures a variety of proprietary stormwater treatment devices. Call today for more information.
