(a) Lead-based paint is present:

1. (1) On any surface that is tested and found to contain lead equal to or in excess of one milligrams per square centimeter (1.0 mg/sq. cm.) or equal to or in excess of five tenths percent (0.5 %) by weight; and
2. (2) On any surface like a surface tested in the same room equivalent that has a similar painting history and that is found to be lead-based paint.

(b) A paint-lead hazard is present:

1. (1) On any friction surface that is subject to abrasion and where the lead dust levels on the nearest horizontal surface underneath the friction surface (for example, the window sill or floor) are equal to or greater than the dust hazard levels identified in subdivision (c)(1) of this section;
2. (2) On any chewable lead-based paint surface on which there is evidence of teeth marks;
3. (3) Where there is any damaged or otherwise deteriorated lead-based paint on an impact surface that is caused by impact from a related building component (such as a door knob that knocks into a wall or a door that knocks against its door frame); and
4. (4) If there is any other deteriorated lead-based paint in any target house or child-occupied facility or on the exterior of any target house or child-occupied facility.

(c) A dust-lead hazard is present in a target house or child occupied facility:

1. (1) In a target house on floors and interior window sills when the weighted arithmetic mean lead loading for all single surface or composite samples of floors and interior window sills are equal to or greater than ten micrograms per square foot (10 µg/sq. ft.) for floors and one hundred micrograms per square foot (100 µg/sq. ft.) for interior window sills, respectively;
2. (2) On floors or interior window sills in an unsampled residential dwelling in a multifamily dwelling, if a dust-lead hazard is present on floors or interior window sills, respectively, in at least one (1) sampled residential unit on the property; and
3. (3) On floors or interior window sills in an unsampled common area in a multifamily dwelling, if a dust-lead hazard is present on floors or interior window sills, respectively, in at least one (1) sampled common area in the same common area group on the property.

(d) A soil-lead hazard is present:

1. (1) In a play area when the soil-lead concentration from a composite play area sample of bare soil is equal to or greater than four hundred parts per million (400 ppm); or
2. (2) In the rest of the yard when the arithmetic mean lead concentration from a composite sample (or arithmetic mean of composite samples) of bare soil from the rest of the yard (that is, nonplay areas) for each target house on a property is equal to or greater than one thousand two hundred parts per million (1,200 ppm).