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Determining Collection Locations for Each Composite <br /> AI %MM <br /> Option A <br /> Sub-sampling locations in bare soil play areas are selected by first sketching the <br /> area and then drawing a circle just encompassing the accessible bare area. A second <br /> circle is drawn inside the first with one-half the radius and three equally-spaced <br /> sampling locations selected at random on the inner circle. Soil sub-samples are then <br /> collected at each location. This process may be repeated for up to three bare soil play <br /> areas, if present. <br /> To sample the building foundation or dripline, take four individual sub-samples. <br /> Where possible, given accessibility limitations and the availability of bare soil, each <br /> sub-sample should be located at random in a bare soil area at the dripline on a different <br /> side of the house. Composite the four individual foundation/dripline sub-samples into <br /> one sample for lead analysis. At other sampling locations in the yard, samples should <br /> be collected following the procedures for play areas. <br /> Option B <br /> Each composite sample should consist of bare area soil sub-samples collected <br /> from 3 to 10 distinct locations roughly equidistant from each other along an axis. For <br /> samples collected along the foundation dripline, sub-samples should be collected at least <br /> 2 to 6 feet away from each other. At other sampling locations, samples should be <br /> collected at roughly equidistant points along each axis of an "x" shaped grid. <br /> Sampling Equipment and Methods <br /> Samples may be collected using a coring tool to acquire the top 1/2 inch (or 1 <br /> centimeter) of the soil surface. Soil coring devices may not be useful in sandy, dry, or friable <br /> soil. In these cases, a stainless steel scoop or the lip of the sample container itself may be <br /> used. <br /> If paint chips are in the core sample taken, they should be included as part of the <br /> sample. Paint chips should not be excluded from the soil sample, since they are part of the soil <br /> matrix. However, there should be no attempt to oversample paint chips. Following the <br /> detailed sampling procedures outlined in Residential Sampling for Lead: Protocols for <br /> Sampling Lead Dust and Soil (EPA, 1994), is essential to correctly apply the guidance provided <br /> here. <br /> Interpreting Results <br /> Bare soil, if highly contaminated with lead, is thought to be a significant hazard to <br /> children who play on it. It may also be a significant source of tracked-in or wind-blown lead <br /> that subsequently contaminates house dust. The level of hazard is determined by comparing <br /> the sampling results to the Section 403 soil lead guidance. <br /> 3 <br />