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45 Farmington Valley Drive <br /> Plainville, Connecticut 06062 <br /> CONESTOGA-ROVERS Telephone: (860)747-1800 Fax: (860)747-1900 <br /> & ASSOCIATES www.CRAworld.com <br /> MEMORANDUM <br /> To: Daniel Lescure REF.No.: 060223 <br /> FROM: Kathy Shaw/eew/13-NF KMS/em DATE: August 23,2013 <br /> Re: Analytical Data Assessment and Validation <br /> Quarterly Groundwater Monitoring <br /> Shell Oil <br /> Shell Cordes Ranch <br /> Tracy,California <br /> July 2013 <br /> INTRODUCTION <br /> The following document details an assessment and validation of analytical results for groundwater samples <br /> collected in support of the quarterly monitoring program at the Shell Cordes Ranch Site during July 2013. <br /> Samples were submitted to Calscience,located in Garden Grove,California. A sample collection and <br /> analysis summary is presented in Table 1. A summary of the analytical methodology is presented in <br /> 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 field 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 quality assurance/quality control(QA/QC)criteria by which these data have been assessed are <br /> outlined in the analytical methods referenced in Table 2 and the documents entitled: <br /> i) USEPA Contract Laboratory Program National Functional Guidelines for Organic Data <br /> Review", United States Environmental Protection Agency (USEPA) 540/R-99-008, <br /> October 1999 <br /> Item i)will subsequently be referred to as the"Guidelines". <br /> Full Contract Laboratory Program(CLP)equivalent raw data deliverables were provided by the laboratory. <br /> The data quality assessment and validation presented in the following subsections were performed based <br /> on the sample results,QA/QC and all raw data provided. <br /> uurtuEO eoulur Eon <br /> 1809001 <br /> EQUAL EtffLOYF4NIOPfC1RNNf EWLOVEH EN O�XE FPING OESIo4 <br />