[Times photo | John Pendygraft]
SUN CITY CENTER -- After pumping thousands of gallons of groundwater into Middle Lake over the weekend following a sewage main break, the county decided this morning to redirect the water flow to a treatment plant.
Community resident Dave Brown had complained about the possibility of leaking sewage mixing with the groundwater pumped into the 40-acre lake, which is used for boating and lawn irrigation. Brown, who lives in one of the more than 100 homes around the lake, worried for the safety of boaters and fishermen at the lake as well as the possiblity of his neighbors' grandchildren playing in sewage-coated yards this Thanksgiving holiday.
But MIchelle Van Dyke, spokeswoman for the county's Water Resource Services, says that it would be "extremely unusual" for sewage in the pipe to have mixed with the surrounding groundwater that was pumped into Middle Lake. But using an "abundance of caution" to allay residents' concerns and because workers this morning detected a slight odor at the site this morning, the county decided to redirect the groundwater to a treatment plant, she said.
The odor, described as sulfuric or similar to rotten eggs, could occur naturally in the groundwater, she said. But to be sure it's not sewage and to learn exactly what's in the water, techinicians were sent to the site and the lake to test the water, she said. Results could be back as early as tomorrow.
The broken main was discovered Wednesday as contractors checked the condition of the sewer main along Del Webb Boulevard as part of an ongoing inspection of the county's infrastructure, said Richard Cummings, a county maintenance field manager. Because the pipe lies 17 feet deep, the surrounding groundwater must be pumped out before the pipe can be excavated and replaced.
The sewage main is a gravity pipe, meaning that it's unpressurized and sewage flows through it down a gentle slope. Cummings said it was highly unlikely that the pipe's sewage leaked into the surrounding groundwater because the pressure outside the pipe was greater than pressure inside the pipe.
"If that (mixture) did happen, it would be extremely unusual," Cummings said, adding that there was no sewage smell when the pumping started this weekend. The groundwater was diverted to Middle Lake as part of normal operations to pump it to the nearest stormwater retention site, he said.
Brown recently won a Moral Courage Award from the county for his advocacy helping thousands of residents save on property insurance because of faulty flood zone maps.
-- Sundra Amrhein, Times staff writer
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