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SSES and Sanitary Sewer System Rehabilitation Mission The challenge Evaluated the Town of Grand Island’s The Town of Grand Island (Town) owns and operates its sanitary sewer existing collection system and system, which includes over 100 miles of collector sewers and analyzed the capacity of their WWTP interceptors, 22 lift stations, seven SSOs, an overflow retention facility and prepared a Workplan for an SSES (ORF), and a 3.5 million gallon per day (mgd) wastewater treatment plant to abate SSOs. Provided phased (WWTP). Several areas of the collection system are prone to wet weather design and construction phase infiltration and inflow (I/I). The Town was issued an Order on Consent by services to implement improvements. the New York State Department of Environmental Conservation (NYSDEC) to eliminate sanitary sewer overflows (SSOs). Client Town of Grand Island, New York, USA Our response GHD was retained to implement a temporary flow metering program to Date characterize the system and quantify I/I in various mini-systems. Based on the flow metering data, GHD prepared a collection system model. 2012-Ongoing Several alternatives were developed to estimate the effectiveness of SSO Value abatement. Alternatives included inflow source identification and removal, sewer rehabilitation including pipe lining, lift station upgrades, in-line $21.5 million (Est.) storage, and increased capacity of sewer pipes. The Power of Commitment Page 180 of 301