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i - :.. :... .,� mss.: - �s. ^, ;sf;. f 'j il sp 4 QUALI'T'Y ASSURANCE AND QUALITY CON'T'ROL PLAN The Quality Assurance and Quality Control (QA/OC) flan describes tole adtnnnstk';ktkve, field, laboratory, and analytical equality control procedures that will be impicknented during this investigation. 4.1 PROJECT ORGANIZATION 9 A senior review team will review all project deliverables and monitor the quality and delivery of the reports. Where quality as.-,urance problems or deficiencies requiring; special action are discovered, the project manager, project administrator, and senior review team will identify the appropriate corrective action to be initiated by the- project manager. 4.2 QUALITY ASSURANCE OBJECTIVES FOR MEASUREMENT The quality assurance objectives of this project are to develop and implement proc- edures to provide data of known quality. Data quality is assessed by precisioL accuracy, represer tativeness, completeness, and comparability. Definitions of these parameters and ine applicable quality control procedures and level of effort are described in the following paragraphs. The applicable quality control procedures, quantitative target limits,and levels of effort for assessing data quality are dictated by the intended use of the data and the nature of the analytical methods. For this project, the parameter analyses are designed toward the identification of the presence of UST-gasoline residues or other appropriate analytes at the site. Target detection limits for this study are set according to instrument/method limitations in the laboratory. Appendix C presents the detection limits that will be used by the CH2M HILL Laboratory. 4.2.1 PRECISION Precision of the data is a measure of the spread of the data when more than one measurement is taken on the same sample. For duplicate measurements, precision can sE031605'%%%'?,W4.51 4-1