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COLUMBIA ANALYTICAL SERVICES,INC. <br /> Client: Shaw Environment&Infrastructure,Inc. Service Request No.: L0600154 <br /> Project: North County Landfill/791288(Ground Water) Date Received: 1/27/06 <br /> Sample Matrix: Water <br /> CASE NARRATIVE <br /> All analyses were performed consistent with the quality assurance program of Columbia Analytical Services,Inc.(CAS). <br /> This report contains analytical results for samples designated for Tier II data deliverables. When appropriate to the <br /> method,method blank results have been reported with each analytical test. Surrogate recoveries have been reported for <br /> all applicable organic analyses. Additional quality control analyses reported herein include: Matrix/Duplicate Matrix <br /> Spike(MS/DMS),and Laboratory/Duphcate Laboratory Control Sample(LCS/DLCS). <br /> Sample Receipt <br /> The samples were received for analysis at Columbia Analytical Services on 1/27/06. All discrepancies were noted upon <br /> initial sample inspection, and reported on the Sample Receipt Exception Report included in this data package. The <br /> samples were received in good condition and consistent with the accompanying chain of custody form. The samples <br /> were stored at 4°C upon receipt at the laboratory. <br /> Volatile Organic Compounds by EPA Method 8260B <br /> The upper control criterion was exceeded for several analytes.in Laboratory Control Samples (LCS) LWG0600419-3. <br /> The analytes in question were not detected in the associated field samples. The error associated with elevated recovery <br /> equates to a high bias. The sample data is not significantly affected. No further corrective action was appropriate. <br /> Dissolved Metals <br /> Batch QC was run along with these samples. These results are provided for information purposes only. The Method <br /> Blank and Laboratory Control Sample were within control criteria. All anomalies are reported on the Footnote <br /> summary page included in the analytical report. <br /> General Chemistry Parameters <br /> No anomalies were encountered during these analyses. <br /> Approved by ��V"�` Date �/ �� <br />