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r <br />C <br />C <br />0 <br />11 <br />11 <br />P <br />i <br />1� <br />i7 <br />n <br />0 <br />COLUMBIA ANALYTICAL SERVICES, INC. <br />Client: Shaw Environment & Infrastructure, Inc. Service Request No.: P0700704 <br />Project: Foothill Landfill, San Joaquin County (New Wells)/I24591 Date Received: 8/1/07 <br />Sample Matrix: Water <br />CASE NARRATIVE <br />All analyses were performed consistent with the quality assurance program of Columbia Analytical Services, Inc. <br />(CAS). This report contains analytical results for samples designated for Tier 11 data deliverables. When <br />appropriate to the method, method blank results have been reported with each analytical test. Surrogate recoveries <br />have been reported for all applicable organic analyses. Additional quality control analyses reported herein include: <br />Matrix/Duplicate Matrix Spike (MS/DMS) and Laboratory Control Sample (LCS). <br />Sample Receipt <br />The samples were received for analysis at Columbia. Analytical Services on 8/l/07. No discrepancies were noted <br />upon initial sample inspection.. The samples were received in good condition and consistent with the <br />accompanying chain of custody form. The samples were stored at 4°C upon receipt at the laboratory. <br />Volatile Organic Compounds by EPA Method 8260B <br />The spike recoveries of several analytes for Laboratory Control Sample (LCS) PWG0701151-3 were outside the <br />lower control criterion. The analytes in question were not detected in the associated field samples. The error <br />associated with reduced recovery equates to a potential low bias. A Method Reporting Limit (MRL) check <br />standard was analyzed to verify instrument sensitivity, which indicated that the analytical batch was in control. <br />The sample data has not been significantly affected. The data has been flagged accordingly, <br />General Chemistry Parameters <br />No anomalies were encountered during these analyses. <br />Approved by Date <br />