Go see Gerry in prison then take a cab to Packie.
Drive Packie and Gracie to the marker, then after the cut scene take out the numerous goons around the water treatment plant. Try to keep behind cover as there are so many enemies that you'll quickly get shot down if you don't. Follow Packie after you clear each area.
There's a body armour pick up near the bottom of the stairs and a health pick up halfway along the walkway at the top.
Work your way around the walkway clearing out all enemies until you finally get to the last man hiding. Take this guy out then go down the nearby ladder and across the road to get one of the vehicles.
Just across the street as you leave the water treatment plant is a parking lot with a couple of big billboards advertising cars. There's a pidgeon on the ground on the southern end of the parking lot.
Now drive Packie back to his ma's house to finish the mission.
Next: Pest Control
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