ARCHIVED REPORTS_WORK PLAN TO ESTABLISH BACKGROUND SOIL CONCENTRATIONS

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GE • GENESIS ENGINEERING&REDEVELOPMENT If an analyte is detected above the PQL in a method blank,then that analyte will be flagged with a "B" for every sample in that batch. The batch will then be assessed to determine if that analyte data is usable or not, taking into consideration the type of contaminant(known lab contaminant), and its level. The tables in SW-846,ASTM, and U.S. EPA methods will be used to validate the definitive data and professional judgment will be applied in accordance with these guidelines. A data validation summary that describes all validated data will be prepared and submitted to the Project Manager for each set of validated analytical data. 8.3 Statistical Assessment of Data Quality The routine procedures used to assess data are precision, accuracy, and completeness. Specific formulas used to quantitatively define these parameters, are presented in the following Sections. 8.3.1 Accuracy Percent Recovery Accuracy is a measurement of the bias in a system, and the accuracy of sampling data for this Project will be determined through the use of laboratory control samples. Accuracy is generally expressed as percent recovery("/oR), which is defined as: %R = 100% x s - U Csa where, s = measured concentration of spiked aliquot U= measured concentration of unspiked aliquot Csa= actual concentration of spike added. If a Standard Reference Material ("SRM")is used instead of or in addition to laboratory control samples, accuracy is defined as: %R = 100% x Cm Csrm where, Cm = measured concentration of SRM in the spiked sample Csrm= actual concentration of SRM The degree of accuracy and the recovery of the analyte are dependent on the matrix, method of analysis, and compound being measured. The objective for accuracy is to equal or exceed • the accuracy demonstrated for the analytical method for samples of similar matrix and William DePaoli Property 1$ of 21 Quality Assurance Project Plan February 2012