(a) impairment requiring confinement to a wheel chair; or
(b) impairment causing difficulty or insecurity in walking or climbing
stairs or requiring the use of braces, crutches or other artificial
supports; or impairment caused by amputation, arthritis, spastic
condition or pulmonary, cardiac or other ills rendering the individual
semi-ambulatory; or
(c) total or partial impairment of hearing or sight causing insecurity
or likelihood of exposure to danger in public places; or
(d) impairment due to conditions of aging and incoordination.
6. "Reconstruction, rehabilitation, alteration or improvement" shall
mean only that work which results in a substantial change in the
structure or facilities of a public building and shall not include minor
repairs necessary for ordinary maintenance.