ALLWASTE <ALWS.O> TO MAKE ACQUISITION Allwaste Inc said it has agreed in principle to acquire a privately-held firm that performs interior cleaning services for tank-trailers for 1,300,000 common shares. It said the firm, which it did not name, earned about 1,500,000 dlrs pretax for the first nine mons of 1987. The company said closing is expected by October 31.