ARCHIVED REPORTS_WELL INSTALL AND QUARTERLY GROUNDWATER MONITORING REPORT 2008

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Well Installation and Quarterly Groundwater Monitoring Report Second Quarter 2008 1950 West Fremont Street,Stockton, California • TestAmerica Laboratories, Inc. Pleasanton (TAL) in Pleasanton, California for VOCs by EPA Method 8260B, SVOCs by EPA Method 8270C and CAM 17 metals (dissolved) by EPA Methods 6010B and 7470A. Field Duplicate: One field duplicate groundwater sample was collected independently at well MW-2 during sampling and was analyzed for the same parameters to verify sampling and analytical precision. The field duplicate was collected by sequentially filling sample containers for the parent sample and then the identical sample containers for the field duplicate sample, starting with the containers for volatile analyses, followed by the containers for other analyses. The duplicate was assigned a separate sample number for blind submission to the laboratory. Trip Blank Sample: One trip blank sample was stored in the ice chest containing the samples to check for potential cross-contamination during sample collection, shipping,or laboratory handling. �j 2.8.2 Laboratory Quality Control Samples Laboratory QC samples were analyzed to monitor the precision and accuracy of the laboratory results. The laboratory QC samples consisted of method blanks and laboratory control samples. In addition, surrogate spikes and internal standards were added to samples and evaluated, as applicable for each method. 2.8.3 Quality Control and Quality Assurance Review of Data A summary of Earth Tech's quality assurance (QA)review of the certified analytical results and analysis- specific quality control (QC) information provided by laboratories utilized during the groundwater monitoring activities is present in Appendix F. Sampling and laboratory records were reviewed to verify completeness of chain-of-custody documentation, appropriateness of sample holding time, surrogate spike recovery, laboratory control spike/laboratory control spike duplicate (LCS/LCSD) recovery, matrix spike/matrix spike duplicate (MS/MSD) recovery, and relative percent difference. The QA review indicated all parameters were within the analytical method-specific limits listed by USEPA or the laboratory-specific control limits developed by the analytical laboratories,with the exceptions noted in Appendix F. No other systematic problems were detected, and the overall data objectives were met.The data reviewed can be used for purposes requiring quantitative information as qualified. ' Project 102790 8 July 2008