ARCHIVED REPORTS_WORK PLAN TO ESTABLISH BACKGROUND SOIL CONCENTRATIONS

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GEfErma • GENESIS ENGINEERING&REDEVELOPMENT frequency of one per each group of 20 samples of the same matrix and, as a result, it is necessary to collect triplicate sample volumes in the field for one sample out of every 20. Two volumes of the sample will be spiked with a standard solution containing all the target analytes, and the third sample volume will be analyzed normally, without spiking. The samples are analyzed and the concentrations found in the spiked samples are used to determine the precision as measured by the percent difference. If the relative percent difference is greater than 20 percent,then the appropriate corrective action should be taken including reanalysis, if necessary. Accuracy also is measured by determining the percent recovery of the spiked compound compared to the actual level that was spiked and the percent recovery must fall within the range established by the laboratory. 7.3 Data Reduction and Reporting In order to ensure proper data management activities and to provide an accurate and controlled flow of data, it is important that data is handled and reported in a concise and useable format. Data management procedures are applicable to field- and laboratory- generated data. The Project Manager is responsible for ensuring that data reduction produces • accurate, controlled, validated,and comparable data. 7.3.1 Field Data Reduction Data generated in the Feld will be recorded in a task-specific Field Notebook or on company Field Data Sheets. If Field Data Sheets are used,the sheets must be attached to the Field Notebook. All calculations performed in the field must be clearly recorded in the Field Notebook. The Project Manager is responsible for the review of all field documentation to ensure completeness and legibility. The following field data parameters will be reported in the units referenced below: • Reconnaissance Boring Location • Sample Depth • Soil Type 7.3.2 Laboratory Data Reduction The analytical data are initially collected, converted to standard reporting units, and recorded in standard formats by the laboratory's project analysts. The project analysts conduct preliminary data analysis using a variety of methods and procedures. Since many analytical instruments are microprocessor controlled, many of the requisite analyses can be performed • directly in the instrument's operating or outputting mode. Those instruments interfaced to William DePaoli Property 10 of 21 Quality Assurance Project Plan February 2012