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' HOUSTON LABORATORY <br />' <br /> 6INTERCHANGE DRIVE <br /> HO O HOUSTON TEXAS 77454 <br /> R (713)660-4901 <br /> Case Narrative for <br />' EXXON Company U S A <br /> Certificate of Analysis Number <br />' 0/060855 <br /> Resort To I Proiect Name UP3942 1 <br /> ETIC Engineering, Inc Site 7-3942 <br /> John Ortega Site Address 2816 W Capital Ave <br /> � 2285 Moreno Avenue <br /> W Sacramento CA <br />' Pleasant Hill PO Number EWR#21012732 <br /> California State California <br /> 94523- State Cert No 1903 f <br />' ph (925) 602-4710 — fax (925) 602-4720 pate Reported 7117101 <br /> Due to a Eaboratory error your samples""MW10' IW1" MW2" MW9" "MW4", "MW3",UVB MW2%and 'V3"were analyzed for MTBE by <br /> SW846 method 8260B 7 days outside the method required holding time Ted Morse was notified on July 11,2001 <br />' Matnx spike(MS)and matrix spike duplicate (MSD)samples are chosen and tested at random from an analytical batch of"like"matrix to <br /> check for possible matrix effect The MS and MSD will provide site specific matrix data only for those samples which are spiked by the <br /> laboratory Since the MS and MSD are chosen at random from an analytical batch the sample chosen for spike purposes may or may not <br />' have been a sample submitted in this sample delivery group The validity of the analytical procedures for which data is reported in this <br /> analytical report is determined by the Laboratory Control Sample(LCS)and the Method Blank(MB) The Laboratory Control Sample (LCS) <br /> and the Method Blank (MB)are processed with the samples and the MSlMSD to ensure method criteria are achieved throughout the entire <br /> analytical process <br />' Any other exceptions associated with this report will be footnoted in the analytical result page(s)or the quality control summary page(s) <br /> Please do not hesitate to contact us if you have any questions or comments pertaining to this data report Please reference the above <br /> Certificate of Analysis Number <br />' This report shall not be reproduced except in full without the written approval of the laboratory The reported results are only representative <br /> of the samples submitted for testing <br />' SAL Inc rs pleased to be of service to you We anticipate working with you in fulfilling all your current and future analytical needs <br /> I <br /> 1 <br /> 01060855 Page 1 <br />' 7117101 <br /> onia West C� <br /> Senior Protect Manager <br /> Date <br />