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tTgg <br /> An <br /> olumbia <br /> 2655 Park Center Drive, Suite A Simi Valley,California 93065 (805)526-7161 (805) 526-7270 faxAnalytical <br /> Services <br /> An Employee-Owned Company <br /> Client: Shaw Environmental &Infrastructure,Inc. CAS Project No: P0800213 <br /> Project: Foothill Landfill, San Joaquin County/ 124591 (Ground Water) <br /> CASE NARRATIVE <br /> The sample(s) were received intact under chain of custody on. 02/07/08 and were stored in accordance <br /> with the analytical method requirements. Please refer to the sample acceptance check form for additional <br /> information. The results reported herein are applicable only to the condition of the sample(s) at the time <br /> of sample receipt. <br /> Volatile Organic Compounds by EPA Method 8260B <br /> For QC purposes,a Laboratory Control Sample(LCS)was analyzed in duplicate. <br /> The spike recoveries for several analytes in the Laboratory Control Samples (LCS/DLCS) identified as <br /> PWG0800288-3 and PWG0800288-5 were outside the lower control criterion. The error associated with <br /> reduced recovery equates to a potential low bias. The analytes in question were not detected in the <br /> associated field samples; however, a Method Reporting Limit (MRL) check standard containing the <br /> analytes of concern was analyzed and verified that instrument sensitivity was adequate to detect the <br /> analytes at the MRL on the day of analysis. Because the sensitivity was shown to be adequate to detect <br /> the compounds in question, the compounds were not detected in the field samples, data quality is not <br /> significantly affected. No further corrective action was taken. <br /> The upper control criterion was exceeded for sec-Butylbenzene in the Laboratory Control Samples <br /> (LCS/DLCS) PWG0800288-3 and PWG0800288-5. The analyte in question was not detected in the <br /> associated field samples. Since the error associated with the elevated recovery equates to a high bias, the <br /> sample data has not been significantly affected. The data has been flagged accordingly. No corrective <br /> action was taken. <br /> Anions by EPA Method 300.0 <br /> The Laboratory Control Sample (LCS) for Chloride was outside the current laboratory acceptance limits <br /> but within the method specified control limits; therefore, the data has been reported and flagged <br /> accordingly. <br /> The results of analyses areiven in the attached laboratory report. All results are intended to be <br /> g y p <br /> considered in their entirety, and Columbia Analytical Services, Inc. (CAS) is not responsible for <br /> utilization of less than the complete report. <br /> 2 <br /> NELAP Accredited ACIL Seal of Excellence Award 0 100%0.,aea <br />