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Task 3: Data Gathering to Support Interim Corrective Measures <br />Task 4: Monitoring Well Installation <br />Task 5: Aquifer Testing <br />Task 6: Ground Water Sampling <br />Task 7: Potential Receptor Identification <br />Task 8: Treatability Studies <br />5.2 Rationale for Sampling <br />Describe where all samples will be collected (location and depth), types of media <br />that will be sampled and the analytical parameters. Explain the rationale for each <br />sampling point, the total number of sampling points, and any statistical approach <br />used to select these points. The conceptual model of contaminant migration <br />developed in the Current Conditions Report should be considered when selecting <br />sampling locations and depths. If some possible sampling points are excluded, <br />explain why. Describe any field screening techniques that will be used to identify <br />samples for laboratory analysis. Include the rationale for use of field screening <br />techniques and criteria for sample selection. <br />5.2.1 Background Samples <br />Background samples should be analyzed for the complete set of parameters for <br />each medium; treat sediments, surface soils and subsurface soils as separate <br />media. Background samples are collected, numbered, packaged, and sealed in <br />the same manner as other samples. For long term and/or especially large <br />projects, it is recommended that 10% of samples collected be from background <br />locations. <br />5.3 Sample Analysis <br />List and discuss all analyses proposed for the project. Include a table that <br />summarizes the following information for each analysis to be performed: <br />o Analytical Parameters <br />o Analytical Method Reference Number (from USEPA SW 846) <br />o Sample Preparation and/or Extraction Method Reference Number (from <br />USEPA SW 846) <br />o Detection and Practical Quantitation Limits (Data above the detection limit <br />but below the practical quantitation limit must be reported with the <br />estimated concentration.) <br />SCOPE OF WORK FOR A FACILITY INVESTIGATION WORKPLAN <br />ATTACHMENT D PAGE 4 <br />