DSA IR 11B-10: SCOPING AND PATH OF TRAVEL UPGRADE REQUIREMENTS FOR FACILITY ALTERATION, ADDITION AND STRUCTURAL REPAIR PROJECTS (with revisions issued through April 2017)
3.4 Three Year History: For areas that have been previously altered without providing an accessible path of travel to those areas, the cost of any subsequent alterations to areas served by the same path of travel during a preceding three-year period shall be considered in determining whether the cost of making the path of travel is disproportionate.
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