Upper Paint Branch: Special Protection Area BMP Sites

Project Manager: Kenneth Williams
Client: Maryland State Highway Administration
Completion Date: July 1, 2009
Original Contract Amount: $476,087.08
Duration: November 18, 2008 to July 1, 2009 – 119 calendar days

The Maryland State Highway Administration contracted Environmental Quality Resources to install a series of biotrench BMPs within stormwater bioretention swales along Ansted Rd, Harold Rd, Kiva Rd, Fireside Dr, Redmiles Dr, Maydale Dr, Claude Ln, and Grandad Ln in Silver Spring, Maryland.

The trenches, which measured two feet wide by a minimum of four feet deep by variable lengths, were infilled with gravel and bioretention mix, and lined with sod. These trenches serve to mitigate the collection of stormwater by the swales, reduce the flow velocity of the water, thus cutting down its erosive capacity, and filter the collected water into the aquifer.