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COLUMBIA ANALYTICAL SERVICES, INC. Client: Shaw Environmental & Infrastructure, Inc. Service Request No.: P0600115 Project: Foothill Hollow Landfill/791289 (Leachate Module) Date Received: 2/2/07 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 The samples were received for analysis at Columbia Analytical Services on 2/2/07. Any discrepancies were noted upon initial sample inspection, and recorded on the Client Notification Form included in this data package. The samples were received in good condition and consistent with the accompanying chain of custody form. The samples were stored at 4°C upon receipt at the laboratory. Volatile Organic Compounds by EPA Method 8260B Sample L-01 (P0700116-001) required dilution due to the presence of elevated levels of target analyte. The reporting limits are adjusted to reflect the dilution. Batch QC was run along with these samples. These results have been provided for informational purposes only. The upper control criterion was exceeded for Trichlorofluoromethane in Laboratory Control Sample (LCS) PWG0700310-3. The analyte in question was not detected in the associated field samples. The error associated with elevated recovery equates to a high bias. The sample data is not significantly affected. No further corrective action was taken. General Chemistry Parameters The following sample was received and analyzed past the recommended holding time for Nitrate as Nitrogen: L-01 (P0700116- 001). The data has been flagged accordingly. The Method Blank (MB) contained a trace hit of Chloride. The associated sample concentrations were greater than 20 times the amount found in the MB; therefore, the data has not been significantly affected. No further corrective action was required. Batch QC was run along with this sample. These results have been provided for informational purposes only. The Method Blank and Laboratory Control Sample were within control criteria. Approved by__ (lf �_ G /�� Date 'i 1/'9