montana--dakota and great plains have ties to six historic manufactured gas plants as a successor corporation or through direct ownership of the plant. montana--dakota is investigating one of these former manufactured gas plant sites and providing input on another site investigation conducted by a third party. to the extent not covered by insurance, montana--dakota may seek recovery in its natural gas rates charged to customers for certain investigation and remediation costs incurred for these sites. cascade has ties to nine historic manufactured gas plants as a successor corporation or through direct ownership of the plant. cascade is involved in the investigation and remediation of three of these manufactured gas plants in washington and oregon. see item 8 -- note 17 for a further discussion of these three manufactured gas plants. to the extent not covered by insurance, cascade will seek recovery of investigation and remediation costs through its natural gas rates charged to customers.