ncentration of lead) equal to or exceeding the levels promulgated by the EPA at 40 CFR 745.65 or, if such levels are not in effect, the standards for dust-lead hazards in ??35.1320.Dwelling unit means a:(1) Single-family dwelling, including attached structures such as porches and stoops; or(2) Housing unit in a structure that contains more than 1 separate housing unit, and in which each such unit