ARCHIVED REPORTS_WORK PLAN TO ESTABLISH BACKGROUND SOIL CONCENTRATIONS

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• GES" GENESIS ENGINEERING&REDEVELOPMENT detections of chemicals in both samples at concentrations greater then the lowest standard used to define the laboratory calibration curve. The lowest standard on the laboratory calibration curve shall be run at the MDL. 7.2.2 Laboratory QC Laboratory QC samples will consist of method blanks, standards, laboratory control samples, matrix spikes,matrix spike duplicates, and surrogate spikes. • Method Blanks are used to detect laboratory-related contamination and are used to identify and minimize interferences caused by solvents, reagents, glassware, or other equipment used in the laboratory's sample preparation and analytical measurement process. A method blank consists of a volume of deionized or distilled laboratory water for organic water samples and inorganic soil samples or a purified solid matrix for organic soil/sediment samples, which is carried through the entire analytical process. The method blank volume or weight must be approximately equal to that of the samples being processed. Method blanks will be analyzed at a minimum frequency of one per batch and the concentration of target • compounds in the blank must be less than the PQL. If the blank exceeds the above criteria,then the source of the contamination must be identified and appropriate corrective action taken, including reanalysis of the sample group. • Laboratory Control Samples ("LCS")consist of blank spikes, which are used to determine the accuracy of the analytical procedure by measuring a known concentration of an analyte of interest. LCSs will be analyzed at a minimum frequency of one per batch. • Surrogate Spike Analyses are used to determine the efficiency of analyte recovery in organic sample preparation and analyses and surrogate standard determinations will be performed for all organic standards, samples, and blanks. Each organic standard, sample, matrix spike, matrix spike duplicate, LCS, and blank is spiked with surrogate compounds prior to purging or extraction. The surrogate spiking compounds are used to fortify the sample with the proper concentrations. Surrogate spike recoveries must fall within the limits established by the laboratory QA plan and the analytical method and if a surrogate spike recovery is outside of acceptable ranges, then a corrective action must be taken. • MS/MSD Analyses are conducted to evaluate the matrix effect of the sample on the analytical method and consist of a pair of samples with a known amount of analyte . added in the laboratory. The MS/MSD analyses must be performed at a minimum William DePaoli Property 9 of 21 Quality Assurance Project Plan February 2012