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Mr. Ross Atkinson March 30, 2001 Page 7 Data Quality This section presents the data quality criteria to support the project objectives. The establishment of a QA/QC system will provide the baseline for measuring data quality in terms of precision, accuracy, completeness,and representativeness of actual site conditions. To achieve the data quality needed to support the project objectives, all analyses for this investigation will be performed using accepted laboratory procedures in accordance with specified analytical protocols. A laboratory certified in the State of California under the Environmental Laboratory Accreditation Program (EI-AP) will perform the analyses. Analyses will be performed in accordance with SW-846 test methods. Together with the sampling plan, these procedures will provide a baseline level of documentation. Laboratory quality control acceptance criteria that will be applied to samples analyzed during this project will meet SW-846. Quality control results attributed to sample matrix effects will be documented and noted in the laboratory reports. Reporting Limits. Reporting limits for this project will be both the method detection limit (MDLs) and Practical Quantitation limits (PQLs). The laboratory will report concentration values at the lowest possible reporting limit The decision thresholds identified for this investigation were based on Water Quality Goals specified in the State of California Regional Water Quality Control Board (RWQCB) for the Central Valley Region (August 2000), specifically PHGs. Data Verification. During the verification process, the laboratory data will be subject to review for QC outliers, anomalies and potential noncompliance with project requirements for the following elements: ■ Date and time of sample collection -required to uniquely identify sample and assess any holding time limitations; ■ Location of samples,including depth,if appropriate - required to uniquely identify samples (these data will be provided in the field logbook); ■ Chain-of-Custody documentation -required to demonstrate integrity of samples and maintain unique identity of samples;it includes a unique sample identification number, sample collection date and time, and signature of the persons relinquishing and receiving the sample; ■ Field QA/QC procedures - required to demonstrate sample integrity;it includes field decontamination procedures to prevent cross-contamination, the collection of field blanks, and the collection of duplicate samples during each sampling activity; ■ Name and location of laboratory - required for chain-of-custody documentation and to verify credentials of laboratory; P:\wp\lobs\20587\102253 Groundwater ArRdoc