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October 16, 1995 UEC Document No.: R -1659510A UEC Job No.: 165040-9510C d. Chain of custody procedures, documenting sample possession, will ensure sample integrity from the time of sample collection until disposal of the sample. e. Samples will be handled and transported according to the EPA's protocol for such activities. 4.2 Baseline Soil Sample Collection: Determination of Asbestos Concentration For Underlying Soil UEC recommends that "Baseline" soil samples be collected prior to the commencement of work activities at the subject site. The approximate locations of soil sample collection, with respect to the designated work areas, are indicated in Figure 2. Note that three baseline samples are proposed to be drawn from around each of the three work areas; the objective of this task is to gain an understanding of the level of asbestos in the soil (if any) immediately surrounding the areas slated for cleanup. A total of nine baseline soil samples will be collected; the average asbestos content for each set of three samples (the samples contained within each set will be collected from adjacent to the same area slated for cleanup) will be used to determine the level of asbestos in "clean" soil for this project. In other words, the composited baseline soil sample results will determine the acceptable level of asbestos in "clean" soil for within each of the designated areas. Each of the baseline soil samples shall be drawn from a depth of no more than 14 inches below grade; the samples shall be collected approximately 4 to 6 inches below the anticipated level of surface scrape from within the three designated areas. 4.3 Post -Cleanup Activity Soil Sample Collection: Determination of Cleanup Effort Effectiveness Upon indication from the asbestos abatement contractor performing the cleanup activities, soil samples will be collected from within the cleanup work areas; the soil samples will be "grabbed" from near the surface of the soil. In Area 1, four (4) samples will be collected; eight (8) samples will be collected from within Area 2; two (2) samples will be collected from within Area 3. The specific locations chosen for sample collection from within a given Area, shall be representative of the area in both general appearance and depth of scrape. Each of the samples collected shall be analyzed individually for the presence of asbestos; the analytical results will be compared to the baseline levels of asbestos for the specific Area from which the samples were collected. The soil sample results, both the baseline set and the final clearance set, will be presented on a map and submitted as part of the closure report submitted to the SJC, PHS, EHD staff for site closure. 10