South Hadley residents are taking it to the streets in their opposition to the town's landfill expansion.  Yesterday, landfill foes stood in the town center with signs saying "Stop Mount Trashmore".  The expansion would ensure the continued flow of money to the town, but protesters say Interstate Waste operates the dump with disregard for neighbors.  A question about the proposed encroachment of the landfill into the nearby Bynan Conservation area will be on Monday's town meeting ballot.