Officials are looking into the environmental effects of a sewage spill near Aberdeen Proving Ground over the weekend, marking the fourth time since July the base?s water treatment system has released partially treated water into the Bay.

A surge of rainwater and sewage pushed the water-treatment plant at the Edgewood section of APG past its 5 million gallon capacity Saturday morning, leadingthe system to discharge approximately 66,600 gallons of partially treated wastewater into the adjacent Bush River, said base spokesman George Mercer.