GRAEF-USA Inc.

Briarwood Sanitary Sewer and Pump Station

The City of Franklin retained GRAEF to prepare contract documents for sanitary sewers throughout the Briarwood Subdivision when municipal sanitary sewer service was extended to the new development that was served by septic tanks. Many of these septic systems had reached their design life, causing operational problems, especially during wet weather periods. All of the new sewers serving the area were connected to a new pump station with a force main to the current limit of the municipal system.

The pump station was designed as a two pump submersible station with sufficient capacity to serve the entire subdivision, as well as limited additional developed and undeveloped land. The station is entirely below grade and was designed to minimize at-grade appurtenances. This effort included landscaping to conceal control panels and ventilation access to the station. Standby power is provided by a portable generator, eliminating the need for an at-grade generator enclosure.

The station has a capacity of 330 gpm with one pump operating and the other pump as a standby. The pumps were equipped with mixed flush valves that provide mixing of the wet well contents prior to the start of pumping to minimize the buildup of solids. The wet well was sized to provide 60 minutes of storage to provide adequate time for notification and delivery of standby power equipment. In addition to the wet well, separate below-grade structures were constructed to house valves and flow meters.
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LOCATION Franklin, WI

FACTS Services Provided: Emergency Storage, Electrical Design, Pump Controls , Pump Sizing, Valve-vault Design, Forcemain Design and Analysis, Level Controls, Permitting, Contract Administration, Construction Services Record Drawings Survey