AECOM and HydroQual will design and oversee the dredging of various tributaries around New York City. This will remove combined sewer overflow (CSO) mounds which contribute to nuisance odours and dissolved oxygen deficits at the head of the tributaries. These dredging programmes are required by the city's Consent Order Mandated Citywide CSO Long-Term Control Plans.
 

John M Dionisio, AECOM president and chief executive officer, said: “We are pleased to have the opportunity to further strengthen our relationship with the NYCDEP through efforts, such as this one, that have a positive environmental impact on the city.”
 

The project includes detailed sediment characterization; water quality sampling and lab analysis; dredge volume estimation; cap design; water-quality modeling; coordination and submission of all necessary permits with local, state and federal agencies; coordination with ongoing US Army Corps of Engineer restoration projects; environmental assessment/impact statements; and public outreach for each targeted dredging area. These services will be required on an expedited schedule to enable the NYCDEP to effectively comply with the city's mandates.