 Investigations into historic waste dumping in the Bliss Corner neighborhood have revealed the existence of PCBs, among other hazardous materials, buried into soil and waste material.In 1982 Martha C. Rose Chemical Inc. began processing and disposing of materials contaminated with PCB's in Holden, Missouri, a small rural community about 40 miles east of Kansas City.From 1982 until 1986, nearly 750 companies, including General Motors Corp., Commonwealth Edison, Illinois Power Co. and West Texas Utilities, sent millions of pounds of PCB contaminated materials to Holden for disposal.