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CALIFOKNIA LABORATORY SERVICES <br /> Page 28 of 28 07/27/06 10:19 <br /> ENGEO-Tracy Project: North Lathrop Properties <br /> 2880 N.Tracy Blvd Ste#3 Project Number: 5044.5.001.01 CLS Work Order#:CPGO655 <br /> Tracy,CA 95376 Project Manager: Zac Crawford COC#:69131 <br /> Dotes and Definitions <br /> QM-7 The spike recovery was outside acceptance limits for the MS and/or MSD. The batch was accepted based on acceptable <br /> LCS/LCSD recovery. <br /> QM-5 The spike recovery was outside acceptance limits for the MS and/or MSD due to matrix interference.The LCS and/or LCSD were <br /> within acceptance limits showing that the laboratory is in control and the data is acceptable. <br /> QM-4X The spike recovery was outside of QC acceptance limits for the MS and/or MSD due to analyte concentration at 4 times or greater <br /> the spike concentration.The QC batch was accepted based on LCS and/or LCSD recoveries within the acceptance limits. <br /> QC-2H The recovery of one CCV was greater than the acceptance limit. However,all analytes in the associated samples were ND; <br /> therefore a reanalysis was not performed. <br /> QB-2 The analyte was detected in the method blank or calibration verfication blank A re-analysis was not performed since all sample <br /> results for the analyte are ND. <br /> HT-4 Sample was originally analyzed within holding time.Due to high concentration of the analyte,the sample was reanalyzed with a <br /> dilution. <br /> BT-4a <1.8 <br /> BT-4 «1.8 <br /> A-COM Due to the ICP/MS instrument problem,it is analyzed with GFAA. <br /> DET Analyte DETECTED <br /> ND Analyte NOT DETECTED at or above the reporting limit <br /> NR Not Reported <br /> dry Sample results reported on a dry weight basis <br /> RPD Relative Percent Difference <br /> CA DOHS ELAP Accreditation/Registration Number 1233 <br /> 3249 Fitzgerald Road Rancho Cordova,CA 95742 www.californial2b.com 916-638-7301 Fax: 916-638-4510 <br />