Another waste-water spill found near Zama City, Alta
Apache Corporation says May spill caused by stress corrosion in pipe
There has been another leak of "produced water" from an Apache Corporation site near Zama City, Alta.
Apache estimates 1.8 million litres of the fluid was released from one of its water injection wells about 100 kilometres south of the N.W.T.-Alberta border.
An official says the leak began on Oct. 3 but wasn't discovered until Oct. 25.
The company says 3.8 hectares of land was affected by the spill.
Produced water is extracted during oil and gas operations. The company says a trace amount of hydrocarbons was present in the water that leaked.
The company says much of the fluid has been removed and disposed of in a licensed facility and that it continues to clean up the spill. It says there's no danger to public health or the environment.
Corrosion caused May leak
Apache has also announced the reason for a larger waste-water spill that began in May near Zama City.
The company says that spill occurred because of stress corrosion in the less-than-five-year-old pipe. It says a "pinhole fracture" in the pipeline's exterior plastic liner allowed water to leak into the pipe and react with sulphur gas that permeated from the produced water within the pipe.
The company now says the amount of produced water released in that spill was 15.4 million litres, instead of 9.5 million litres, which is what it originally said.
It says that discrepancy happened because of metering issues and inaccurate internal data.
Apache says the entire section will be replaced by a new pipeline made of different materials and that it is installing real time monitoring equipment at all of its water injection sites.