JEFF GRANIT  Archaeologist field manager Sean McHugh (r) throws a shovel of dirt into a screen for Alexandra Diliberto to sift through for artifacts Monday at a site in Red Bank on Front Street where K. Hovnanian will soon build its new world headquarters.JEFF GRANIT Archaeologist field manager Sean McHugh (r) throws a shovel of dirt into a screen for Alexandra Diliberto to sift through for artifacts Monday at a site in Red Bank on Front Street where K. Hovnanian will soon build its new world headquarters.