First excavation project Pressed at an August 12 meeting of the United Mine Works of America in Centralia, Secretary of Mines Lewis Evans sent a letter to the group on August 15 that claimed he had authorized a project to deal with the mine fire, and that bids for the project would be opened on August 17. Two days later, the contract was awarded to Bridy, Inc., a company near Mount Carmel, for an estimated $20,000 (roughly ). Work on the project began August 22. At one point, work was at a standstill for five days during the
Labor Day weekend in early September. Finally, the fire was traveling in a northward direction, which caused the fire to move deeper into the coal seam. This, combined with the work restrictions and inadequate equipment, greatly increased the excavation cost. Bridy had excavated of earth by the time the project ran out of money and ended on October 29, 1962.
Second excavation project On October 29, 1962, just prior to the termination of the Bridy project, a new project was proposed that involved flushing the mine fire. Crushed rock would be mixed with water and pumped into Centralia's mines ahead of the expected fire expansion. The project was estimated to cost $40,000 (roughly ). Bids were opened on November 1, 1962 and the project was awarded to K&H Excavating with a low bid of $28,400 (roughly ). Drilling was conducted through holes spaced apart in a
semicircular pattern along the edge of the landfill. However, this project was also ineffective due to multiple factors. Centralia experienced an unusually heavy period of snowfall and unseasonably low temperatures during the project. Winter weather caused the water supply lines to freeze in 1962. Furthermore, the rock-grinding machine froze during a windy blizzard. Both problems inhibited the timely mixture and administration of the crushed-rock slurry. The DMMI also worried that the of flushing material would not be enough to fill the mines, thus preventing the bore holes from filling completely. Partially filled boreholes would provide an escape route for the fire, rendering the project ineffective. These problems quickly depleted funds. In response, Secretary Evans approved an additional $14,000 (roughly ) to fund this project. Funding for the project ran out on March 15, 1963, with a total cost of $42,420 (roughly ). On April 11, 1963, steam issuing from additional openings in the ground indicated that the fire had spread eastward as far as , and that the project had failed.
Third project A three-option proposal was drawn up soon after that, although the project would be delayed until after the new fiscal year beginning July 1, 1963. The first option, costing $277,490, consisted of entrenching the fire and back-filling the trench with incombustible material. The second, costing $151,714, offered a smaller trench in an incomplete circle, followed by the completion of the circle with a flush barrier. The third plan was a "total and concerted flushing project" larger than the second project's flushing and costing $82,300. The state abandoned this project in 1963. ==Later remediation projects==