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Farmington Valley Drive <br /> Plainville, <br /> CONESTOGA-ROVERS Plainville, Connecticut 06062 <br /> & ASSOCIATES Telephone: (860) 747-1800 Fax: (860) 747-1900 <br /> www.CRAworld.com <br /> MEMORANDUM <br /> To: Daniel Lescure REF. No.: 060223 <br /> FROM: Kathy Shaw/eew/17-NFA' DATE: July 8, 2014 <br /> RE: Analytical Data Assessment and Validation <br /> Soil Sampling <br /> Shell Oil-Shell Cordes Ranch <br /> Tracy,California <br /> May 2014 <br /> 1.0 Introduction <br /> The following document details a reduced validation of analytical results for groundwater samples collected <br /> in support of the Shell Oil Soil Sampling at the Shell Cordes Ranch Site during May 2014. Samples were <br /> submitted to Calscience, located in Garden Grove, California. A sample collection and analysis summary is <br /> presented in Table 1. A summary of the analytical methodology is presented in Table 2. <br /> Evaluation of the data was based on information obtained from the finished data sheets, raw data, chain of <br /> custody forms, calibration data, blank data, duplicate data, recovery data from surrogate spikes, laboratory <br /> control samples (LCS), matrix spikes, and file quality assurance/quality control (QA/QC) samples. The <br /> assessment of analytical and in-house data included checks for: data consistency by observing <br /> comparability of duplicate analyses; adherence to accuracy and precision criteria;transmittal errors; and <br /> anomalously high and low parameter values. <br /> The QA/QC criteria by which these data have been assessed are outlined in the document entitled: <br /> L IIUSEPA Contract Laboratory Program National Functional Guidelines for Organic Data Review", <br /> United States Environmental Protection Agency(USEPA) 540/R-99-08, October 1999 <br /> 2.0 Sample Holding Time and Preservation <br /> The sample holding time criteria for the analyses is summarized in Table 2. Sample chain of custody(COC) <br /> documents and analytical reports were used to determine sample holding times. All samples were <br /> prepared and analyzed within the required holding times. <br /> The samples were properly preserved and delivered on ice and stored by the laboratory at the required <br /> temperature (0-6°C). <br /> 914.116.1.OOUMNY van <br /> ISO 9001 <br /> ENGINEERING DESIGN <br /> EOVTLEMPLOYMENTOPPOPTUNIV EMPLOYED <br />