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exceed regulatory limits, action levels, or target concentrations specified in the QAPjP. Evaluation of Data with Respect to Control Limits -- This review compares the results of QC and calibration check samples to control criteria. Corrective action should be implemented for data not within control limits. The reviewer should check that corrective action reports, and the results of reanalysis, are available. The review should determine whether samples associated with out-of-control QC data are identified in a written record of the data review, and whether an assessment of the utility of such analytical results is recorded. Review of Holding Time Data -- This review compares sample holding times to those required by the QAPjP, and notes all deviations. Review of Performance Evaluation (PE) Results -- PE study results can be helpful in evaluating the impact of out-of-control conditions. This review documents any recurring trends or problems evident in PE studies and evaluates their effect on environmental data. Correlation of Laboratory Data -- This review determines whether the results of data obtained from related laboratory tests, e.g. , Purgeable Organic Halides (PDX) and Volatile Organics, are documented, and whether the significance of any differences is discussed in the reports. 2.7.5 QA Reports There should be periodic reporting of pertinent QA/QC information to the project management to allow assessment of the overall effectiveness of the QA program. There are three major types of QA reports to project management: Periodic Report on Key QA Activities -- Provides summary of key QA activi- ties during the period, stressing measures that are being taken to improve data quality; describes significant quality problems observed and corrective actions taken; reports information regarding any changes in certification/accreditation status; describes involvement in resolution of quality issues with clients or agencies; reports any QA organizational changes; and provides notice of the distribution of revised—documents controlled by the QA organization (i .e. , procedures) . Report on Measurement Quality Indicators -- Includes the assessment of QC data gathered over the period, the frequency of analyses repeated due to unacceptable QC performance, and, if possible, the reason for the unac- ceptable performance and corrective action taken. Reports on QA Assessments -- Includes the results of the assessments and the plan for correcting identified deficiencies; submitted immediately following any internal or external on-site evaluation or upon receipt of the results of any performance evaluation studies. ONE - 7 Revision 1 July 1992