Pump Station Construction Site

The Pump Station will be an a 116 foot shaft excavated 210 feet deep, and lined with a 6 foot thick concrete liner. Inside of this will be a 24 foot diameter wet well from which the sewer flows will be pumped to the head works of the South Cobb WRF for treatment. The plant will be capable of pumping at a rate of 130 million gallons per day.

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IPS and PS

The Pump station is located along Lee industrial Road, just east of the South Cobb WRF.

Pump Station Construction Site

Construction of the IPS shaft was performed by lowering the existing ground surface 15 feet to clear the airplanes in the Charlie Brown Airport's flight path. Holes were augered into the ground to a depth where they could not be augered any more. These holes were then filled with concrete. Every fifth hole has a steel pile in it for greater strength.

IPS Installing soldier piles, 2008-09-15

When all of these piles were installed, it looked like Stonehenge

The dirt inside the secant piles was then excavated, and steel ring beams were installed.

IPS drilling for first blast under secant piles blast cover waiting, 2008-12-09

Note that when the second ring was in place, the shaft was down into rock that required drilling and blasting on one fourth of the shaft. The big steel thing on the shaft bottom is a blast mat to reduce noise and potential flyrock.

Shotcrete and bolts are used to support the shaft in the rock from here on down.

And yes, those are men working on the shaft bottom in the lime yellow jackets.

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