ARCHIVED REPORTS_WORK PLAN TO ESTABLISH BACKGROUND SOIL CONCENTRATIONS

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GE�=� • GENESIS ENGINEERING 8 REDEVELOPMENT 6.1 Analytical Procedures During the investigation to Establish Background Concentrations, chemical analyses and physical characteristics will be measured on-site by field personnel and off-site by the analytical laboratory. Parameters for which the SAP has not defined procedures will be analyzed with a method that meets the objectives of the Work Plan. 6.1.1 Analytical Methods Analytical procedures follow the methods set forth in the U.S. EPA's SW-846 guidelines, unless otherwise approved by the Project Manager or Technical Coordinator. In some instances,the analytical methods contained in SW-846 may not meet the Data Quality Objectivess (e.g., detection limits may be greater than applicable or relevant and appropriate requirements). If the use of an alternate analytical method is deemed necessary, the modified method will be described in an addendum to the SAP. 6.1.2 Method Detection Limits The Method Detection Limit("MDL") is the lowest concentration at which a particular • analyte can be measured and reported with a 99 percent confidence that the analyte concentration is greater than zero. The MDL should be determined by multiplying the appropriate one-sided 99 percent T-statistic by the standard deviation obtained from at least seven analyses of a matrix spike containing the analyte of interest at a concentration of 3 to 5 times the estimated MDL. MDLs for each target analyte will be determined by the analytical laboratory using the applicable SW-846 protocol or the method specified in 40 Code of Federal Regulations, Part 136, Appendix B. The laboratory will then develop individual Method Reporting Limits ("MRL")that represent concentrations that can be consistently obtained by the method and are generally 2 to 5 times the respective MDL. 6.1.3 Practical Quantitation Limits As specified in SW-846, Practical Quantitation Limits ("PQL"), also referred to as the Estimated Quantitation Limits ("EQL"), are defined as the lowest level of quantitation that can be reliably achieved within specified limits of precision and accuracy during routine laboratory operating conditions. The PQL or EQL is generally 5 to 10 times the MDL, but may be nominally selected within these guidelines to simplify data reporting. The laboratories must demonstrate that PQLs are routinely and reliably achieved by analyzing a calibration standard that is below the PQL for each analyte. Certified laboratories are expected to routinely achieve PQLs for SW-846 analytical methods. Laboratories may report results as MRLs,which are generally 2-5 times the MDL. • William DePaeli Property 6 of 21 Quality Assurance Project Plan February 2012