The city of Boise told crews April 27 to stop pumping groundwater at the site of a 156-unit apartment complex between ParkCenter Boulevard, Warm Springs Avenue and the Boise River, city spokesman Mike Journee said.
The day before, city erosion inspector Andy Long reported a “muddy discharge” from a temporary reservoir where workers were storing the groundwater so that they could hook sewer pipes for the apartments to the city’s sewer main line. The discharge flowed over the Boise River Greenbelt. Of greater concern, it carried dirt and other contaminants into Walling Creek, which runs just west of the future apartment site and drains into the Boise River.
Keeping erosion material out of the drainage is important for maintaining its health for fish and other species.
After the breach occurred, crews placed a system of filters at the breach site and the ground below it to stop dirt and other solid particles from reaching the creek and river, Journee said. Long reported Wednesday that water samples taken upstream and downstream of the leak showed the “ discharge to be within allowable turbidity limits.”
Groundwater discharge has since stopped, according to Long’s report. The city will allow work on the project, named The Arboretum at Barber Station, to resume, Journee said.