Specifications include, but are not limited to: The Town of Cheshire and its Water Pollution Control Authority (WPCA) are seeking Qualifications Statements from qualified engineering firms for the purpose of selecting a consultant to prepare an Infiltration/Inflow (I/I) Study of the Town’s gravity sewer collection system and to conduct a hydraulic capacity evaluation of the Town’s Water Pollution Control Plant (WPCP). Engineers should have experience conducting studies in accordance with Connecticut Department of Energy and Environmental Protection (DEEP) guidelines. The consultant will review and evaluate existing available information to gain an understanding of the specific services required to identify areas of excessive infiltration and inflow within the collection system. The following information will be made available to the selected consultant. • GIS database information including: o Collections system map in GIS format o Sewer layers o Parcel and aerial layers • As-built drawings including: o 1968, 1989, 2007 and 2017 WPCP Drawings • Previous engineering studies and reports including: o 1990 and 2000 I/I Studies o 2017 WPCP O&M Manual FLOW MONITORING PROGRAM: Based on the available collection system GIS database, the consultant will plan and implement a 12-week flow monitoring program during the spring of 2024. The flow monitoring program data will be utilized by the consultant to identify and prioritize areas of excessive I/I in the collection system and to calibrate and validate the collection system hydraulic model. The consultant will install, calibrate, and maintain approximately 25 flow metering devices, two groundwater gauges, and two rain gauges at selected locations throughout the collection system. Field reconnaissance will be conducted at each proposed flow metering site to assess hydraulic conditions and overall suitability. Five-minute data will be compiled, reviewed, and made available to the Town via the consultant’s website bi-weekly...
