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Stockton 99 Speedway Quality Assurance Project Plan April 12,2007 f F 3.3 Quantitation Limits, Precision, and Accuracy Goals For soil samples analyzed for organochlorine pesticides, metals, VOCs, and TPH the laboratory's practical quantitation limit (PQL) will be used.- In the event of sample interference, an upper bound for the quantitation limit for acceptance of data as valid for purposes of this PEA will be set at the levels shown in Table 2. These values are generally below the respective screening levels shown in Tables 2. If the upper limit is not met, attempts will be made to remove the interference that is causing the elevated limit. If this is not possible, the data will be flagged with a notation with the type of interference, if possible. The r analytical laboratory will provide detection limits along with the data for organochlorine pesticides, metals, TPH, and VOCs. f Data will be analyzed to meet data quality objectives. Data will be accepted and rejected based on the DQO. If the data may be affected by variability and accuracy indicators defined in the EPA method, such as low recovery for spikes or surrogates, further evaluation will be performed. Audits will be initiated when DQO are not being met. f Comparability is .measured in several ways. Data from the two different laboratories may be verified using split samples. Data from this sampling event will be compared to past data. Field blind duplicates 4 (soil)will also be used to evaluate results from the laboratory. Laboratory Quality Control (QC) Reports will be reported along with the laboratory data. The Laboratory Quality Assurance/Quality Control {QAIQC) reports will be analyzed for anomalies. Laboratory data will be evaluated for conformance to method performance criteria and industry standards. Quality_Msureime_Pmject Plan.Final.doc 3-3 The Source Group,luL f