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MAR-16-86 14.47 FROM. AGUIRR~NCINEER6 [NC . , Mr. and Mrs. Tatum Msrch 18, 1995 Page 8 S. Poor Dn+lnaoe ID. • PAGE ,7 Other tnveatlgators have commented on poor drainage In the area around the residence. They remark on cortditlona, especially in the garden area south of the residence, where the fall of the ground la very smell and may be locally towards the structure, A location where we observed poor drainage la towards the west end of the south wall Weer the porch. However, there are no root downspouts that discharge in this area, and wa did not observe indlcationa of water accumulation. In our opinion poor drainage cannot explain the recent settlement damage, because it appears ttu-t the drainage (s eswntially unchanged from the time the structure was built In five 1930'8. It teas been suggested that the poor drainage In conjunction with the clayey upper soils could be producing saeaonsl movements, However, this would not be a changed condition that could explain the recent distress. The poor drainage could have contributed to soma of the on~oing normal aging described earlier. 8. Foundation Deterioration Were the foundations to deteriorate or rot away, support would be lost to portions of the structure and distress could result. It has been suggested that water infiltration due to the poor drainage may ba weakening the adobe. However, as noted above, the drainage conditions appear unchanged for many years. Therefore, adobe sohening Is not likely to be the reason for the recent distress. To the extent we could observe it, the wooden elements bearlrtg on the foundation were sound. No rotten lumber was observed in the foundation area. 7. Mine Subsidence Previous Investigators have dleoounted mine subsidence as the cause of the recent distress because they considered the workings to be too far away from the structure. _ ~ However, we understand that the mining Could have been within 200 to 300 feet of ` ~ 1. ~ the structure. 7htre, depending on the theory used for analysis, the residence could r~~~ ' .1 . be at or within the potential subsidence zone. i Mine subsidence has also bean discounted because damage to the residence is U,;~ centered at the front of the house, whereas the mining was to the south. In this regard ws note that the angle of draw Concept is a simplification of what actually happens. Theories relating to coal mine subsidence are based on empirical evidence 'and atatlatlcal snalysis of data obiairled over known mining conditions. In most mining situations actwl subsidence can be quite erratic and is governed by many factors including the types of rock strafe that exist over the roof of the mine, the orientation r.~q.m•uaoreola. ,-