Some southern Maine commuters might see a lot of activity involving emergency vehicles for the next couple of days. On Friday and Saturday, a hazardous materials drill will be conducted at Monson Chemical Co. on Runway Road in South Portland. Officials say the drill will run from 8 a.m. until about 2 p.m. each day. A lot of equipment and personnel will be on the scene each day. Many mutual aid companies from other towns will be there as well as part of the drill.