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Sequoia 680 Chesapeake Drive 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 /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)92f-9600 FAX(916)921-0100 <br /> �, r Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler RyanJGeoStrategies Client Picgect ID Unocal 5421, 140162 02 <br /> 6147 Sierra Court, Suite J <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine QC Sample Group 9804C43-03 Reported Apr 30, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015M <br /> Analyst A PORTER <br /> - _ ANALYTE Diesel _ <br /> QC Batch # GC0427980HBPEXF <br /> Sample No 9804D18-2 <br /> Date Prepared 4121198 <br /> Date Analyzed 4122198 <br /> Instrument I D # GCHP5B <br /> Sample Conc , mg/Kg 40 mg/Kg <br /> Conc Spiked, mg/Kg 17 THE MS AND MSD FAILED <br /> DUE TO MATIX INTERFERENCE <br /> Matrix Spike, mg/Kg 35 THE SAMPLE MS AND MSD <br /> % Recovery -29 WERE ALL RUN AT A 4X DILUTION <br /> Matrix <br /> Spike Duplicate, mg/Kg 39 <br /> % Recovery -5 9 <br /> Relative % Difference -130 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK042798FS <br /> Date Prepared 4127198 <br /> Date Analyzed 4128198 <br /> Instrument I D # GCHP5A <br /> Conc Spiked mg/Kg 17 <br /> Recovery mg/K9 15 <br /> LCS % Recovery 88 <br /> Percent Recovery Control Limits <br /> — SD 50 150 <br /> F--LCS <br /> 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 ANALYTICAL 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 /> Mike Gregory <br /> Project Manager <br />