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~ T ~ UNITED STATES DEPART!ffiNT OF THE INTERIOR office of Surface liining Reclamation i Enforcement Appalachian Regional Coordinating Center REPORT OF INVESTIGATION Tatum Subsidence Complaint TDN X-93-020-370-005.TV-3 Trinidad, Colorado Introduction The Western Regional Coordinating Center (WRCC) requested technical assistance on May 17, 1995 in the investigation of a subsidence complaint at the Tatum Ranch near Trinidad, Colorado. The site was visited on May 19, 1995 by Dr. Jesse L. Craft, geologist of the Appalachian Regional Coordinating Center (ARCC). In attendance were Mike Rosenthal, WRCC; Jim Pendleton, Colorado Division of Minerals i Geology (DMG); Larry Bennett, Basin Resources, Inc., Golden Eagle Mine; and Carl Gerity, Pioneer Engineering. Site Evaluation The following observations were made during the field visit: 1. There is no visible damage to the garage, concrete drive, walkway, and breezeway between the garage and the house. 2. Separation cracks were observed around windows on the south wall of the house. Most of the damage was observed in the area of the two-story part of the structure. The separation cracks all open upward. Water damage, including an accumulation of adobe mud, was observed in the upstairs room on the southeast corner of the building. The south wall in this room showed extensive water damage. 3. A rafter pole, extending out from the structure in the porch area on the ground floor at the south east corner of the structure, shows water damage around the rafter pole--with the pole sinking into the adobe brick. 4. A comparison between photographs of the Tatum house from a book on the history of the area and present-day conditions clearly shows that two rafter poles on the top floor and three on the first floor are no longer present. The missing rafter poles were located over the center of the windows on the top floor and over the center of 1