Residents in a riverfront community have complained about a recent decrease in water clarity. Local ire has fallen on a local pig farm that has recently expanded its operations upstream of the town, but the pig farm claims that it is taking actions to protect the waterway and is pointing to the new shopping center across the river as a source of increased sedimentation. What water quality tests could you perform to determine the source of the increased turbidity? 

How would you expect the samples to differ if the pig farm is responsible?