Stormwater July/August 2012 : Page 58

PROJECT PROFILE pretreatment. The Retenu chemical-free treatment process uses ﬁ l-tered stormwater for backwashing, ﬂ ushing out accumulated dirt and concentrated pollutants, before sending water back to the stormwa-ter sedimentation pond. This process reduces the concentration of particu-lates in the efﬂ uent by removing solid metals and other pollutants prior to enhanced ﬁ ltration. The secondary treatment com-ponent is an Aquip enhanced me-dia ﬁ ltration system. This simple system provides efﬁ cient removal of stormwater pollutants including oils, suspended solids, turbidity, or-ganics, nutrients such as ammonia and phosphorus, and heavy metals including copper, zinc, iron, lead, aluminum, nickel, and cadmium. While Aquip offers a level of stormwater treatment that meets most stormwater quality standards, Davis Industries’ unique situation required a more advanced level of stormwater treatment for additional removal of dissolved metals to meet Virginia water-quality standards. The third and ﬁ nal element of the storm-water treatment train is a Purus stormwater polishing system. This system provides the most advanced level of stormwater treatment, re-moving ﬁ ne particulates and tur-bidity to single-digit nephelometric turbidity unit (NTU) standards and removing dissolved metals down to the parts-per-billion range. Construction and installation of the initial StormwateRx system was completed in early September 2011. Because every site is different, once treatment BMPs are installed, test-ing and ﬁ ne-tuning of the system are done during the ﬁ rst series of rain events. Davis monitored seven storm events that had discharges, resulting in 96% to 76% reduction in the monitored parameters. “As a company, we are very impressed with StormwateRx’s professionalism and knowledge in working with their customers,” says Bukevicz. “They are proac-tive in helping companies like ours to meet our benchmark goals and improve our BMPs for stormwater. And the beneﬁ ts to us, as a com-pany, have been great. The Storm-wateRx treatment train has put Davis Industries at the forefront of environmental technology for the scrap metal recycling industry. We are proud to own one of the most environmentally protective systems on the East Coast.” For related articles: www.stormh2o.com/project-design Learn & Earn with Forester U With David Hein, P.Eng., V.P. of Transportation & Principal Engineer, ARA Chair of the ASCE T&DI Permeable Pavement Structural Design Committee @ Register Today .net! Detailed Design and Construction of Permeable Pavements ForesterUniversity Thursday, July 12 1 PDH / 0.1 CEU Join David Hein, P.Eng., chair of the new ASCE T&DI Permeable Pavement Structural Design Committee, for the second session in our Permeable Pavement Master Class Series: Detailed Design and Construc-tion of Permeable Pavements exploring the structural and hydrological design and construction features, challenges, and application of permeable pavements (porous asphalt, pervious concrete, and permeable interlocking concrete pavements) through real-world worked examples and case studies of perme-able pavement designs for roadways and parking areas. After a discussion of key design aspects, we’ll discuss case study examples of interlocking concrete block permeable pavements using the Permeable Design Pro software developed by the Interlocking Concrete Pavement Institute. Upcoming Webinars s June 21–Sept. 6 Permeable Pavement Master Series 4 PDH / 0.4 CEU David Hein, P.Eng, Vice President of Transportation, Applied Research Associates s August 9 Impact of Permeable Pavement Design and Construction on Performance 1 PDH / 0.1 CEU David Hein, P.Eng, Vice President of Transportation, Applied Research Associates Like us @ Forester.University Follow us @ ForesterU Add us @ Forester.University Subscribe @ ForesterUniversity s Sept. 6 Permeable Pavement Live Case Studies 1 PDH / 0.1 CEU –Key Factors in the Design and Construction of Permeable Pavements David Hein, P.Eng., Vice President of Transportation, Applied Research Associates y @ Register toda .net! ersity ForesterUniv FU_SW1207_House_Hein_5p Develop your skills and earn PDH/CEU credits at Forester University–without the hassle. 58 July/August 2012 www.stormh2o.com