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JIM TRLI)M 8 RSSOCIRTES TEL~7~995-7191 May 24.9: 512 No .007 P.05 • Progress Report on Tatum House Subsidence issues Pago 2 April 12, 1996 There are a~ couple of examples of problems that have been noted on these maps. While working with Mr Baldwin on subsidence issues relating to the Golden Eagle Mine on hie property across the highway fYrom yours, we obtained a Dopy of the MSHA map dated November 29,1893. There was a 300 ft. + error in plotting the surface political subdivisions with respect to the mine workings. This error was subsequently corrected, and in fact section lines have been completely eliminated from the copy of the map that was given to you by OSM. There is a 1 in. to 100 fit. scale photobase map made by the City of Trinidad along their water supply line in the Purgatory river valley. Sheot 11 includes the Tatum house. The distance from the inside point of the "L' of the Tatum house to the railroad is scaled to be 69b ft. Tho distance scaled on the 1 in. to 400 ft. scale MSHA map is 716 ft., about the same as the 1 in. to 600 ft. scale permit maps. A NAPP 1:40,000 aerial photo (No. 6672-72) flown 6130/93, was scanned, the image was zoomed to 833x and the distance was scaled by computer to be 696 ft. The conclusion ie that the house maybe at least 20 ft. closer to the mine workings than the distance used in the evaluations to date. 'WOODWARD•CLYDE CONBULTAN'i'8 STUDY In 1881 the Department of Energy Contracted a study of the "Characterization of Subsidence over Longwell Mining Panels", to Woodward-Clyde Consultants of San Francisco California, Contract No. DE-AC22-BOPC30117. The report is dated September 19,1882. This study was conducted at the Allen Mine (Golden Eagle) near Weston, CO. I borrowed a copy of his report from the Deaver office of the U 5 Bureau of Mines. The purpose of this study was part of a program conducted by the Department of Energy to develop a relevant data base of information to improve subsidence prediction techniques in each of the major coal fields in the United States with the intent of perhaps expanding coal production. The Allen Mine was chosen ae representative of tho Rocl~y Mountain Coal Province. The study consisted of establishing surface and underground monitoring points on two coal mining panels ono of which was a longwall panel and the other included room and pillar data. Baseline measurements were made 12/17/Bland final readings were takes 616/82. The study was terri>inated 2 years earlier than planned because of a cancellation of the program by DOE, and although the project was turned over to the USBM, it was never funded. ti