Code of Maine Rules › 06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION › 096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL › Chapter 424 - LEAD MANAGEMENT REGULATIONS › Appendix 096-424-C - HUD Guidelines for the Evaluation of Control of Lead-Based Paint Hazards or Housing

Current through 2024-29, July 17, 2024
Composite Dust Sampling
If composite sampling is used, a minimum of three separate
				  composite dust samples should be collected. A fourth composite sample is needed
				  if wall-to-wall carpets are present. The composite samples should be collected
				  from floor, interior windowsills, and window troughs.
Risk assessors should follow the composite sampling protocol
				  found in Appendix A of this Chapter. The following rules should be observed
				  when conducting composite dust wipe sampling.
Separate composite samples are required from carpeted and
				  hard surfaces (e.g., single composite sample should not be collected from both
				  carpeted and bare floors).
Separate composite samples are required from each different
				  component sampled (e.g., a single composite sample should not be collected from
				  both floors and interior windowsills).
Separate composite samples are required for each dwelling
				  unit.
Floor surface areas sampled in each room should be
				  approximately the same size (1 ft2 or 929
				  cm2). Window trough and interior windowsill sampling
				  sizes are dependent on window characteristics but should be as similar as
				  possible from room to room (e.g., the surface sampling area should not be
				  skewed so that one room is oversampled).
A new wipe should always be used for each spot
				  sampled.
No more than four different wipes should be inserted into a
				  single container for a composite sample. Acceptable recovery rates (80-130
				  percent of the "true" value) have been found when no more than four wipes are
				  analyzed as a single sample (Jacobs, 1993©).
While a risk assessor should exercise professional judgement
				  about the number and location of samples, three or four composite dust samples
				  are sufficient for most evaluations in smaller dwelling units.
In an unoccupied dwelling unit or a dwelling unit facing
				  turnover, the areas that are most likely to have lead-contaminated dust should
				  be sampled. In general, floor samples should be collected in the four rooms
				  with the greatest evidence of chipping and peeling paint. In a dwelling unit
				  where children reside, however, areas where young children are most likely to
				  be exposed to lead hazards should be sampled. The recommended subsampling
				  locations for houses with children are the following:
Principal playroom for children (usually the TV room, living
				  room, or dining room).
Kitchen.
Bedroom of the youngest child, who is over 6 months of age
				  (children under 6 months are unlikely to be exposed to dust[1]).
Bedroom of the next oldest child.
The preceding locations for subsamples can be used for both
				  single-family and multifamily dwelling unit risk assessments. However,
				  substitute locations will be necessary in dwelling units where the room
				  designations cannot be determined. For example, in vacant units, the living
				  room should be substituted for the playroom and the smallest bedroom for the
				  youngest child's room.
1
https://www.cdc.gov/nceh/lead/prevention/children.htm
.