ARCHIVED REPORTS_ROY'S AUTO - HISTORICAL (2)

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I� � If duplicate composite samples are collected from the same bare soil area(s), the arithmetic average of the tw$-la3L-L-1a*e1S should be compared to the Section 403 guidance: If non-composited individual samples are taken instead of composites, within an area expected to have relatively homogenous lead levels, the arithmetic average of the individual samples should be compared to the standard. However, individual samples above the standard might possibly indicate that there are inherently large differences in lead levels and that more sampling or some remediation should be considered. SAMPLING AND TESTING FOR LEAD IN PAINT Where to Sample For a residential unit, all interior rooms, the exterior sides of the unit, and the outside property around the unit are to be inspected. The residence should be divided into room equivalents. Room equivalents are standard interior rooms, stairways and hallways which are not usually regarded as rooms, portions of very large rooms, each of the sides of the house, and the outside property. Within the room equivalents, painted components are to be identified and grouped by component type, substrate, and visible color. For example, if there are four walls in a room, all made of plaster, and all painted with white paint, these four walls are all grouped together. One wall of the four is to be randomly selected to represent the four walls. In similar fashion, the inspection continues in each room equivalent with the identification of unique combinations of component, substrate, and visibl: color. A random representative of each unique combination is to be sampled and tested in each room equivalent. For each of these designated components, an area on the component is to be chosen which represents the paint on that component. During the inspection, components which are accessible surfaces, friction surfaces, impact surfaces, or have deteriorated paint are to be identified. How Many Samples It is expected that between 50 to 200 components will be identified for testing at a residential unit. In multifamily housing with more than 20 units, a random sample of units for inspection is allowed. Units and buildings that have similar construction, floor plans, and painting history should be grouped for sampling purposes. Samples may be selected for each group. In multifamily housing with 20 or fewer units, each unit is to be sampled. In both cases, individual units are to be sampled following the guidance on where to sample described for residential units. The number of units in the sample should be determined from Table I, which 4