Lenard Engineering, Inc., is a multidisciplinary consulting engineering firm with permanent office locations in Glastonbury, Winsted, and Storrs, CT, and in Auburn, MA
2210 Main Street
P.O. Box 1088
Glastonbury, CT 06033
Sanitary sewer systems typically convey wastewater by gravity to sewage treatment plants. Where pipeline excavation is difficult because of rock or where there is flat or uphill terrain, gravity collection systems may not be practical and the sewage must be pumped under pressure through force mains. The design and sizing of sewage collection systems depends upon present and future population served, commercial and industrial flows, flow peaking characteristics and wet weather flows.
Low-Pressure Sewer Systems — In low-lying communities, sewage may be conveyed by low pressure pumps and vacuum systems. A low-pressure system uses a small grinder pump located at each point of connection, typically a house or business. The grinder pumps force the wastewater through small diameter pipes to downstream treatment. Because the wastestream is pressurized, the pipes can be laid just below the ground surface along the land's contour.
Septic Tank Effluent Pumping Systems — Community sewage can also be collected by an effluent sewer system, also known as a STEP system. At each home, a buried collection tank is used to separate solids from the liquid effluent portion. Only the liquid portion is then pumped through small diameter pipes to the treatment facility.
Inflow and Infiltration — Although sanitary sewer systems are intended to transport only sewage and not stormwater, all sewer systems have some degree of inflow and infiltration of surface water and groundwater which can lead to sanitary sewer overflows.
Following are LEI Wastewater Project examples:
Replacement Sanitary Sewers & Laterals, Prospect Street Reconstruction — Winsted, Connecticut
Sanitary Sewer Extension, Main Street — Hardwick, Massachusetts
Perch Rock Train Wastewater Pump Station, Winchester Water & Sewer Commission — Winsted, Connecticut
Wastewater Treatment Equalization Tank, University of Connecticut — Storrs, Connecticut