The Johns-Manville-Waukegan site is located along Lake Michegan in East-Central Lake County, Illinois. The disposal area, or site, covers approximately 120 acres of the approximately 300 acres of land owned by the Manville Service Corporation, formerly the Johns-Manville Sales Corporation. The Manville plant presently produces and has produced a wide range of building materials. Since 1922, waste materials containing primarily asbestos, and to a lesser extent, lead, chrome, thiram and xylene have been deposited in a variety of pits at the site many of which are no longer in use. Presently, no asbestos or lead is used in the manufacturing process except friable asbestos. Currently active waste disposal pits include: the asbestos disposal pit, which receives friable asbestos wastes from manufacturing building reconstruction activities; the sludge disposal pit, which receives dredged materials from the onsite wastewater treatment system; and the miscellaneous disposal pit in which miscellaneous, non-asbestos-containing wastes are and were deposited.