BUFFTON <BUFF> TO POST INVESTIGATION CHARGE Buffton Corp said it will conduct an investigation on a plant designated as a Superfund Site, which will result in a charge of about six cts per share in its second quarter. In the year ago second quarter, Buffton reported net income of 10 cts a share or 330,000 dlrs on sales of 10.3 mln dlrs. The study should be completed in nine months and will determine any clean-up or remedial action that may be required. Robintech Inc, the plant's former owner, will split the cost. Buffton said its share will cost 400,000 dlrs.