Update 15 Nov 2015:
This seems to be a recurring problem. From time to time Peter Bros. needs additional capacity for paving and brings in a second mobile asphalt plant. Last year when Peter Bros. was paving the airport runways in the middle of the night they struck a deal with the PIB to locate the second plant in the south west corner of the Westhills Aggregates pit. This was a slightly improved situation for Area F residents because the smoke and noise were farther away from houses.