Environmental regulators on Friday said “out of an abundance of caution” the state will test and remove “slag-like material” on a Jersey Shore bay beach where one advocacy group and neighbors fear hazardous lead may be present. The removal of the material will start Monday, calling for parts of a Keyport beach to be cordoned off as investigators determine where the pieces came from and how far-reaching possible contamination may be. A team will surface “scrape” about 200 yards “of where we have seen this visible material at this time,” Shawn LaTourette, the commissioner of the New Jersey Depar…