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COLUMBIA ANALYTICAL SERVICES, INC. Client: Shaw Environmental & Infrastructure, Inc. Service Request No.: P0700704 Project: Foothill Landfill, San Joaquin County (New Wells) Date Received: 8/2/07 Sample Matrix: Water CASE NARRATIVE All analyses were performed consistent with the quality assurance program of Columbia Analytical Services, Inc. (CAS). This report contains analytical results for samples designated for Tier II data deliverables. When appropriate to the method, method blank results have been reported with each analytical test. Surrogate recoveries have been reported for all applicable organic analyses. Additional quality control analyses reported herein include: Matrix/Duplicate Matrix Spike (MS/DMS), and Laboratory Control Sample (LCS). Sample Receipt Two water samples were received for analysis at Columbia Analytical Services, Kelso on 8/2/07. The samples were received in good condition and consistent with the accompanying chain of custody form. The samples were stored in a refrigerator at 4°C upon receipt at the laboratory. General Chemistry Parameters No anomalies associated with the analysis of these samples were observed. Total and Dissolved Metals No anomalies associated with the analysis of these samples were observed. Organochlorine Pesticides by EPA Method 8081A Continuing Calibration Verification (CCV) Exceptions: The primary evaluation criterion was exceeded for Toxaphene in the CCV. In accordance with CAS standard operating procedures, the alternative evaluation specified in the EPA method was performed using the average percent recovery of all analytes in the verification standard. The standard meets the alternative evaluation criteria. Results for Toxaphene in QC sample KWG0708498-1 LCS/2DLCS have been reported from a column using average percent recovery of all analytes in the verification standard. No other anomalies associated with the analysis of these samples were observed. PCB Aroclors by EPA Method 8082 No anomalies associated with the analysis of these samples were observed. Herbicides by EPA Method 8151A Continuing Calibration Verification (CCV) Exceptions: The analysis of Chlorinated Herbicides by EPA 8151 requires the use of dual column confirmation. When the CCV criteria is met for both columns, the higher of the two sample results is generally reported. The primary evaluation criteria were not met on the confirmation column for MCPP. The results are reported from the column with an acceptable CCV. The data quality is not affected. No further corrective action was necessary. Approved by f�.�s 36 Datciq t