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S <br /> • <br /> CASE NARRATIVE <br /> Prepared For <br /> Robert Cochran <br /> ChevronTexaco <br /> 6001 Bollinger Canyon Road L4310 <br /> San Ramon, CA 94583-0904 <br /> Prepared By: <br /> Lancaster Laboratories <br /> 2425 New Holland Pike <br /> Lancaster, PA 17605-2425 <br /> SAMPLE GROUP <br /> The sample group for this submittal is 828474 Samples arrived at the laboratory . <br /> on Saturday, October 26, 2002 <br /> METHODOLOGY <br /> The specific methodologies used in obtaining the enclosed analytical results are <br /> indicated on the laboratory chronicles <br /> COMMENTS <br /> Poor surrogate recoveries were observed for sample MW-61D from Facility 93232 <br /> for the GC/MS volatile fraction The analysis was repeated and poor surrogate <br /> recoveries were again observed indicating a significant matrix effect <br />