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Stockton 99 Speedway Quality Assurance Project Plan April 12,2007 6.0 CALIBRATION PROCEDURES AND FREQUENCY Laboratory analytical instruments will be calibrated in accordance with the procedures specified in the applicable method. All analytes that are reported shall be present in the initial and continuing calibrations, and these calibrations must meet the acceptance criteria specified in the reference method. Records of standard preparation and instrument calibration will be maintained. Records shall unambiguously trace the preparation of standards and their use in calibration and quantitation of sample results. Calibration records will be traceable to standard materials. At the onset of analysis, instrument calibrations will be checked using all of the analytes of interest. At a minimum, calibration criteria will satisfy method requirements. Analyte concentrations can be determined with either calibration curves or response factors, as defined in the method. Guidance provided in USEPA SW-846, or applicable method, should be considered to determine appropriate evaluation procedures. All equipment and instruments used in the field will be maintained and calibrated to operate within the manufacturer's specifications to ensure the required sensitivity and QA/QC parameters. Use of all field instruments will be documented by maintaining a log for each individual instrument. Calibration and maintenance requirements of the field instruments follow the manufacturer's s,.., specifications. Any required modifications, adjustments, repairs or replacement of parts for any piece of equipment are recorded in the instrument's logbook. The effects of the modifications will be tested with appropriate standards and the related procedures recalibrated, if required prior to continued use of the equipment. Table 3 lists the field instruments used for the project and provides a maintenance schedule for the field equipment. 7.0 QUALITY CONTROL PROCEDURES This section presents QC requirements relevant to analysis of environmental samples that will be followed during all project analytical activities. The purpose of the QC program is to produce data of known quality that satisfy the project objectives and that meet or exceed the requirements of the standard methods of analysis. This program provides a mechanism for ongoing control and evaluation of data quality measurements through the use of QC materials. 7.1 Quality Control Procedures The collected chemical data will ultimately be used to determine that the nature and extent of contamination is properly evaluated and to potentially support further evaluations such as risk QUOIiy_AMrarxEk_Projed PIan.Final.doc 7-1 The Source Group,Inc.