An international roofing shingle manufacturing company with a facility in the Pacific Northwest triggered corrective actions for zinc and copper at one of its stormwater outfalls during the stormwater sampling year.
Following a successful installation at another of the company’s facilities, StormwateRx was contracted for fast track turn-key design, supply and installation of another stormwater treatment system to reduce discharges of zinc and copper to the benchmarks. The treatment design developed by StormwateRx required no excavation which accelerated the permitting timeline and substantially reduced the cost of the project. The total project timeline from StormwateRx contract award to powering up the treatment system was nine (9) weeks.
The corrective action sizing criteria were based on the peak runoff flowrate of 50% of the 2-year, 24-hour storm for the plant’s geographic location. Using existing below ground detention, StormwateRx’s design calculations generated a treatment flow rate of 160 gpm from the 3.5 acres of unpaved surface in the drainage area. Additional detention was added to allow treatment of the Tier II runoff at a flow rate of 110 gpm.