The two friends, who were taking part in a training session with their running club, had been crossing the road at the pedestrian crossing to get from the stadium to the recreation ground, when the collision happened at 7.10pm.
Both girls suffered fatal injuries and were pronounced dead at the scene.
The court also heard that results from detailed scene examinations by the Forensic Collision Investigation Unit established that there would have been at least six seconds between the amber traffic light first illuminating and the girls starting to cross, giving Casey at least six seconds to react to the presence of the crossing and the pedestrians.
Casey was sentenced to six years for each count of causing death by dangerous driving, to run concurrent.
He was also disqualified from driving for ten years.
“Now the devastated families of Stacey and Lucy are forced to live on without them, knowing that their heartbreak could have so easily been avoided if Mr Casey had made the right decision and not driven that evening.
“As the court heard, not only was Mr Casey over the drink-drive limit, witnesses from the scene told our officers that he was travelling significantly above the 30mph speed limit and he himself admitted he was distracted.
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Paying tribute to Lucy after the sentencing her family said: “Lucy was a truly exceptional girl; in appearance, personality, achievements and potential.