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KLEINFELDER <br /> The laboratory also reports the possible presence of asbestos at less than one percent. This is <br /> noted as < 1% on Table 4-3. These reported "trace" amounts of fiber may be asbestos at <br /> naturally-occurring background levels, minute amounts of wind-blown asbestos, or some other <br /> fiber mistaken for asbestos at these low levels. <br /> 4.2.4 Results <br /> Results of the analyses are shown on Drawing 2. Quantifiable levels (greater than or equal to. <br /> 1% asbestos) are indicated with bold type. Analytical results are summarized in Table 4-3. <br /> Results from the limited soil sampling conducted in 1990 (filled oval figures on Drawing 2 <br /> ) <br /> generally have higher concentrations of asbestos than the 1991 sampling. Kleinfelder believes <br /> the reason for this was that the prior investigation limited sampling to areas immediately <br /> adjacent to a prior use area, for example, the side of an old haul road. In many cases when <br /> the sampling was directed away from the use area, the surface asbestos levels decreased or <br /> asbestos was not detected. Asbestos was detected most frequently in the near-surface samples. <br /> Subsurface soil samples were generally free of asbestos. In four locations subsurface soils <br /> were also found to contain asbestos in excess of 1 percent. (Sample numbers 65880, 65798, <br /> 47158 and 68399. <br /> 4.2.5 Conclusions <br /> The surface soil investigation provides sufficient data to estimate the lateral extent of surface <br /> asbestos for the purpose of surface soil remediation. Plate 4-2 shows the areas where surface <br /> soil remediation is proposed. The method of remediation depends on the location of <br /> contamination and will be discussed in greater detail in Chapter 6. <br /> CR14-92-12 Page 12 of 39 24-220109-1709 <br /> Copyright 1992 Kleinfelder, Inc. <br />