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Sequoia 660 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(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 /> Blaine Tech Services Client Project ID Chevron 9-82641980609-J1 <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attertion Fran Thie QC Sampie Croup 9806003-01 Reported Jun 24 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A Porter <br /> ANALYTE Diesel <br /> QC Batch # GC0617980HBPEXC <br /> Sample No 9806A75-2 <br /> Date Prepared 6/16/98 <br /> Date Analyzed 6117/98 <br /> Instrument I D # GCHP4B <br /> Sample Conc ug/L N D <br /> Conc Spiked ug/L 1000 <br /> Matrix Spike ug/L 790 <br /> % Recovery 79 <br /> Matrix <br /> Spike Duplicate uglL 860 <br /> % Recovery 86 <br /> Relative % Difference 8 5 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK061 798CS <br /> Date Prepared 6117/98 <br /> Date Analyzed 6/18/98 <br /> Instrument I D # GCHP4B <br /> Conc Spiked ug/L 1000 <br /> Recovery ug/L 770 <br /> LCS % Recovery 77 <br /> Percent Recovery Control Limits <br /> MS/MS0 50150 <br /> F- LCS 60140 <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 /> SEQUOI ALYTICAL 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 anaiytical 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 /> regory <br /> lect Manager <br />