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Ire 'n <br /> CASE NARRATIVE <br /> Prepared For: <br /> Bob 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 815180. Samples arrived at the laboratory <br /> on Wednesday, July 17, 2002. . <br /> METHODOLOGY <br /> The specific methodologies usedjn-obtaining-the=enclosed-analytical results=are- - <br /> indicated on the laboratory chronicles. <br /> COMMENTS <br /> The surrogate data associated with sample MW-7 from Facility 90557 was <br /> outside the QC limits in the original TPH-DRO extraction. Results from the <br /> reextraction are also outside the QC limits, indicating possible matrix <br /> interference. <br /> Accurate surrogate recoveries could not be determined due to the dilution <br /> required for the TPH-DRO analysis of samples MW-9 and MW-9S from Facility <br /> 90557. <br /> The surrogate data associated with sample MW-9A from f=acility 90557 was <br /> outside the QC limits in the original Methanol extraction. Results from the <br /> reextraction are also outside the QC limits, indicating possible matrix <br /> interference. <br />