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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 `AX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 5421, Stockton <br /> 6747 Sierra Court, Suite J <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine QC Sample Group 9804Al2 Reported Apr 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matro, Solid — �t <br /> Method EPA 8015M i <br /> Analyst A PORTER <br /> ANALYTE Diesel _— <br /> QC Batch # GC0416980HBPEXB <br /> Sample No <br /> Date Prepared 4116/98 <br /> Date Analyzed 4/17198 <br /> Instrument I ❑ # GCHP58 <br /> Sample Cone mg/Kg N D <br /> Cone Spiked, mglKg 17 <br /> Matrix Spike, mg/Kg 15 <br /> % Recovery 88 <br />• Matrix <br /> Spike Duplicate mg/Kg 14 <br /> % Recovery 82 <br /> Relative % Difference 7 1 <br /> RPD Control Limits 0 50 <br /> LCS Batch# BLK041698BS <br /> Date Prepared 4116198 <br /> Date Analyzed 4117198 <br /> Instrument I D # GCHP5B <br /> Cone Spiked mg/Kg 17 <br /> Recovery mg/Kg 16 <br /> LCS % Recovery 94 <br /> Percent Recovery Control Limits <br /> MSIMS❑ 50150 <br /> 17 LCS 60 140 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br />• SEQUOIA NAVYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> gory <br /> roject Manager <br />