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l 1551 IndustrialRoad 4D (650)232 Sequoia San CarloarloCAs CA 94070 Anal3 tical FAX 9600 7 (650)232-9612 ' www sequoialabs com *r-Ryan/Geostrate Ries(I} Project Tosco(1) Sierra Court,Suite J Project Number Unocal SS#08671,Stockton,CA Reported Dublin CA,94568 Project Manager Deanna Harding 02/28/02 11 15 Notes and Definitions Q-28 The opening calibration verification standard was outside acceptance criteria by-2% Although the Laboratory Control Sample verified the accuracy of the batch,this should be considered in evaluating the data for its intended purpose Q-28a The opening calibration verification standard was outside acceptance criteria by-4% Although the Laboratory Control Sample verified the accuracy of the batch,this should be considered in evaluating the data for its intended purpose Q-28b The opening calibration verification standard was outside acceptance criteria by-5% Although the Laboratory Control Sample verified the accuracy of the batch,this should be considered in evaluating the data for its intended purpose Q-28c The opening calibration verification standard was outside acceptance criteria by 1% Although the Laboratory Control Sample verified the accuracy of the batch,this should be considered in evaluating the data for its intended purpose QR-04 Primary and confirmation results vaned by greater than 40%RPD The results may still be useful for their intended purpose S-LIM The surrogate recovery was outside control limits The result may still be useful for its intended purpose DET Analyte DETECTED ND Analyte NOT DETECTED at or above the reporting limit NR Not Reported dry Sample results reported on a dry weight basis Relative Percent Difference S a Analytical -San Carlos The iesults in this report apply to the samples analyzed in accordance with the chain of custody document This analytical?epoi t must be rep?oduced in its entirety Page 16 of 16