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Low Moor WIC Pump Station Overview
The Low Moor WIC Pump Station is designed to pump the wastewater flows from Low Moor and portions of the Western Industrial Corridor (WIC) to the new Clinton wastewater treatment facility.
The Low Moor WIC Pump Station includes the following equipment: 
  • Influent pumps
  • Influent pump variable frequency drives (VFDs)
  • Wet well level monitoring
  • Flow monitoring
  • Radio transceiver
  • Gas detector
The Low Moor WIC Pump Station does not include screening.  The influent pumps are non clog centrifugal with impellers designed to pass a 3 inch sphere.  Initially, all flow will be from Low Moor and screened at their facility.
By ordinance, new sources discharging wastewater upstream of the Low Moor Pump Station will be required to a) install, operate, and maintain a mechanical grinder(s) for all domestic wastewater and/or a mechanically cleaned bar screen(s) for all wastewater prior to discharge, or b) make arrangements with the City to ensure that a mechanical grinder(s) and/or a mechanically cleaned bar screen(s) is provided upstream of the Low Moor WIC Pump Station for such discharges.
While not specifically designed for such, the Pump Station wet well could accommodate a manual basket screen.  Otherwise, the addition of a mechanical grinder(s) or screen(s) would require a separate structure.
Wastewater from the city of Low Moor and industrial facilities located in the Western Industrial Corridor (WIC) enters the Low Moor WIC Pump Station in a 21" gravity sewer line.  Two influent pumps powered by VFDs pump the wastewater through an 8" forcemain to the new wastewater treatment facility, located about 3 miles from the pump station. A second 14" forcemain was included in the project to handle future flows.  The influent pumps were selected such that they could be retrofitted to increase impeller diameter, operating speed, and motor horsepower initially to handle future flows.  The pump station is also designed for two additional pumps as industrial growth in the WIC area further increases flows to the pump station.  The pump station communicates with the existing wastewater treatment facility in Clinton through radio transceivers.  There is a transmitter tower at the Pump Station site, a repeater on the Comanche Water Tower, and a receiver at the Beaver Channel Pump Station. 
Two separate power sources from Eastern Iowa Light and Power (563-659-3149) provide electrical service to the pump station.  An automatic transfer switch will switch from EILP's Elvira feeder to the Camanche feeder.  Clinton owns the automatic transfer switch but Eastern Iowa Light and Power (EILP) provides maintenance of the switch.  If there are problems with the automatic transfer switch, Jack Small with EILP should be contacted to handle service of the switch.

                        Office:  563-732-2211
                        Cell:     563-529-3741
The pump station has an initial peak flow capacity of 0.504 MGD (350 gpm) consistent with calculations and correspondence with IDNR.  This should be adequate to accommodate peak hour flows from Low Moor as high as 350 gpm and peak hour flows from WIC and other sources as high as 142 gpm.  The pump station and force mains have an ultimate capcity estimated at 5.83 MGD (4050 gpm).  More information on initial and future Pump Station sizing is presented in the Low Moor Draft TM.
As a remote, unmanned facility, the Low Moor lift station is equipped with the following sensors to provide alarm notification through SCADA back to the Clinton WWTP:
  1. Combustible gas detector provides a signal to the PLC based on percent LEL in the pump room.  Alarms are set at 10% LEL for alert and 50% LEL for alarm.
  2. Sump alarm is a float switch that alerts the operator of a failure of the sump pump or a major leak in the pump room.
  3. Room temperature transmitters located in the pump and electrical rooms read the room temperature and send that data through SCADA to the operator.  Alarms are set at 40o F and 100o F.
  4. Intrusion alarms are installed on the doors at the lift station.  These are normally open proximity switches, held closed by the door they monitor.  Opening of the doors activates the alarm.
  5. The UPS system for the PLC is equipped with an alarm that will signal the operator of a problem with the UPS or loss of power to the UPS.
  6. The Surge Protective Device in the main power panel HP01 is equipped with an alarm to signal the operator of an electrical fault.

All alarm signals are transmitted by radio back to the Clinton WWTP with no local alarm annunciators.

Influent Pumps6
The two influent pumps in the Low Moor Pump Station pump the wastewater flow received at the station through a 8" forcemain to the new wastewater treatment facility.  The pump station is designed for two future pumps and a 14" forcemain was also included in the project to handle future flows.  Potable water is not available at the pump station so seal water for the influent pumps is provided from screened pumped flows.  The operator sets the desired levels for pump control and alarming from a remote HMI at the Clinton WWTP.  A float switch is set at a wet well level of 10 feet to notify the operator at the Clinton WWTP of a high wet well condition.  Another float switch is set at a wet well level of 1 foot to shut down the pumps through an interlock with the pump VFDs.
Influent Pump VFDs6
  The influent pumps are equipped with variable frequency drives to provide adjustable speed operation of the influent pumps.  This allows the pumps to adjust discharge rate based on varying influent flow conditions. 
Wet Well Level Monitoring6
  The wet well level is monitored with an ultrasonic level sensor.  Wet well level signals are transmitted to the PLC for control of the pump operation.  Low level and high level float switches are also installed in the wet well to alert the operator of critical issues at the pump station.
Pump Station Flow Monitoring6
  Flow from the Low Moor Pump Station in the 8" forcemain is monitored with a magnetic flow meter.  Flow data is sent to the PLC which transmits the information to the Clinton WWTP for display of integrated and instantaneous flows.
Radio Transceiver6
The Low Moor Pump Station is located approximately 3 miles from the new wastewater treatment facility and communication with the pump station is established with radio transceiver equipment.  The radio sends pump station operation status information back to the existing wastewater treament facility and recieves pump control requirements from the remote HMI.
Gas Detector 6
The gas detector monitors the levels of combustible gases in the lower level pump area of the lift station.

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Last Updated: 9/20/2013 3:52:22 PM
Version 3.0.1