When the Pittsburgh Corning Corporation closed its asbestos insulation plant in Tyler, Texas, two years ago, it did an unusually thorough job of cleaning up after itself. Some 60 workers spent a week scraping asbestos waste from machinery and depositing it in a nearby dump. Then another crew took over. Ceilings and walls were steam cleaned. Every piece of equipment in sight was scrubbed down; some machinery was disassembled and shipped to P.C.C.'s home office in Pittsburgh. What was left was cut up and buried. When the crew finished, all that remained of...
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