DURING MAINTENANCE OF THE NORTHFIELD MOUNTAIN POWER STATION, LARGE QUANTITIES OF SOLIDS ACCUMULATED IN THE SUPPLY TUNNEL. FIRST LIGHT BEGAN DISCHARGING THESE SOLIDS TO THE CONNECTICUT RIVER WITHOUT A NPDES PERMIT. AN ADMINISTRATIVE ORDER WAS ISSUED TO THE COMPANY REQUIRING IT TO IMMEDIATELY CEASE THE DISCHARGE, AND TO DEVELOP A PLAN TO REMOVE ACCUMULATIONS OF THE DISCHARGE SOLIDS THAT HAD SETTLED INTO THE RIVER.