ARCHIVED REPORTS_WORK PLAN TO ESTABLISH BACKGROUND SOIL CONCENTRATIONS

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GER • GENESIS ENGINEERING&REDEVELOPMENT 6.1.4 Method Calibration At least once daily, or if the instrument exceeds calibration limits, calibration for each target analyte will be performed, to ensure that the analytical instrumentation is functioning within the established sensitivity range. All analytes specified in the SAP must be present in the initial and continuing calibrations, and these calibrations must meet the acceptance criteria specified by the respective method. The laboratories must demonstrate that PQLs are routinely and reliably achieved by analyzing a calibration standard that is below the PQL for each analyte. Calibration standards and solutions will be of known concentration and purity to achieve the criteria necessary for validation of the analytical results. Inorganic standards must conform to the National Institute of Standards and Technology Central QA Laboratory. Organic standards must conform to materials certified by the Cooperative Research and Development Agreement, National Institute of Standards and Technology Central QA Laboratory, or Contract Laboratory Program Standard Reference Material. Standards used in this program will be prepared and maintained under the normal laboratory standards tracking system, which ensures preparation, checking, documentation, storage, and disposal of standards according to method specified procedures and schedules. • 7.0 CALIBRATION PROCEDURES AND FREQUENCY Calibration procedures establish the relationship between calibration standards and the measurement of each standard by an instrument or analytical procedure. All field equipment will be calibrated according to the manufacturer's schedule or, at a minimum, prior to use in the field. If a schedule is not provided by the manufacturer,then the calibration group servicing the equipment will provide a written calibration and maintenance frequency. Calibrations will follow the manufacturer's instructions for equipment calibration and maintenance. A record of the instrument calibration will be maintained in the Project Files. 7.1 Preventive Maintenance A preventive maintenance plan allows for periodic instrument checks for problems that occur frequently. The objective of a preventive maintenance plan is to rectify equipment problems before they interfere with the investigation to Establish Background Concentrations. Preventive maintenance also brings attention to those areas of the instrument susceptible to degradation from aging,toxic/corrosive effects, and clogging due to environmental factors. Procedures for preventive maintenance are contained in each instrument's manual under the maintenance/troubleshooting sections. Each piece of equipment will have an associated standard operating procedure detailing the calibration/maintenance instructions and • William DePaoli Property 7 of 21 Quality Assurance Project Plan February 2012