Considered even more onerous than California's Proposition 65 GMA and Associated Industries of Massachusetts are leading an industry coalition to defeat the measure. Opponents of the bill testified at a hearing of the Massachusetts Senate Natural Resources Committee earlier this year and an additional hearing will be held to air more views. The bill may well be voted out of the committee say political observers since Committee Chairman Sen. Lois Pines sponsored the bill. Its chances beyond that are considered less rosy. If it fails the Massachusetts Public Interest Research Group may try to make it a ballot initiative in 1998.