Technical Description:
- CDS Hydrodynamic Separation System
- CMP Detention System
- The Stormwater Management StormFilter®
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The Town of Bovina wanted to construct a new, modern Town Highway Garage to replace the old, dilapidated
garage. Because the project site is within the New York City drinking water supply watershed, it fell under the
jurisdiction of the New York City Watershed Memorandum of Agreement. The agreement required that the
construction of the new garage include an engineered stormwater pollution prevention plan (SWPPP) to control the
stormwater runoff that is approved by New York City Department of Environmental Protection (NYCDEP).
The Catskill Watershed Corporation (CWC) is a non-profit organization funded by New York City to administer funds
within the West of Hudson portion of the watershed. Because the project fell within the Catskill Watershed, it was
fully funded – including maintenance – by the CWC’s Future Stormwater Program.
Traditional stormwater criteria require both improving the quality and managing the quantity of stormwater runoff.
A best practice is to incorporate pretreatment, detention and treatment into an integrated system or treatment train.
The Town of Bovina worked with Lamont Engineers to design a SWPPP plan that included stormwater pretreatment,
detention and filtering solutions from Contech.
LaFever Excavating, Inc. installed a CDS® 2015 hydrodynamic separation system to pre-treat the runoff. The CDS
system screened, separated and trapped the debris, sediment and oil and grease from the stormwater runoff. Next, a
CMP Detention System was installed to capture the water quality volume and meet the requirements of Chapter 6 in
the NY Stormwater Design Manual.
The final treatment stage included a 72-in. Stormwater Management StormFilter® vault, utilizing 18-in. tall
cartridges. The StormFilter is the only BMP to undergo long-term independent field evaluations under each of the
widely recognized TARP, TAPE and ETV field monitoring programs. The StormFilter also achieves the required 80%
TSS (includes sub-50 microns particle sizes) and 40% phosphorous per NYSDEC. This passive media filtration system
was installed to remove any remaining fine solids, soluble heavy metals, oil and nutrients from the runoff. The
cartridges were filled with with ZPG™ media, a proprietary blend of zeolite, perlite and GAC designed to improve
the performance of perlite and target organics, soluable metals and other pollutants. The Stormwater Management
StormFilter was the preferred solution because it was a more cost-effective and easily maintained system as
opposed to the alternative.
“The CMP Detention System was easy to install,” said Jonathan LaFever of LaFever Excavating. “The manhole units
were also easy to install.”
Technical Description:
- CDS Hydrodynamic Separation System
- CMP Detention System
- The Stormwater Management StormFilter®
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