A geotechnical investigation must be performed for retaining walls constructed on
fill, on soils subject to shrink/swell behavior and on soils mapped (See Garner, L.
E., and K.P. Young,
Environmental Geology of the Austin Area: An aid to Urban Planning
, Bureau of Economic Geology, University of Texas at Austin, Report of Investigations
No. 86, 1976) as Taylor Clay, Del Rio Clay, or Eagle Ford Formation, as well as for
walls higher than 10 feet (3 meters) regardless of the subsurface materials and conditions.
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