I have a potential customer who has a leaking down spout on the front of his house. Right now he has a downspout drainage tube that connects to a pvc setup that is cemented into the front porch. Problem is water is settling where the drainage tube and the pvc connect. The pre-existing down spout is not burried and kinda angles back toward the house which might be the problem. I also noticed the cement around the pvc system is wet which makes me think the system might be cracked inside the porch. In any case he wants me to burry a new drainage pipe that connects the pvc system to the front lawn. The pipe needs to go under a patio walkway that is 4 feet wide. Materials would cost me about $18. What would you charge for this install?