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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9400 FAX(650) 364-9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (9t6)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Blaine Tech Services Client Project ID Chevron 9-20331990217-P1 <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Christine Lillie QC Sample Group 9902842-01 Reported Mar 5, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst TLP <br /> ANALYTE Gasoline <br /> QC Batch # GCO224996TEX30A <br /> Sample No GW9902850-01 <br /> Date Prepared 2124199 <br /> Date Analyzed 2124199 <br /> Instrument I D # GCHP30 <br /> Sample Conc ug1L N D <br /> Conc Spiked ug/L 250 <br /> Matrix Spike, ug1L 220 <br /> % Recovery 88 <br /> Matrix <br /> Spike Duplicate uglL 220 <br /> % Recovery 88 <br /> Relative % Difference 0 0 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GCO22499BTEX30A <br /> Date Prepared 2124199 <br /> Date Analyzed 2124199 <br /> Instrument 1 D # GCHP30 <br /> Conc Spiked, ug1L 250 <br /> LCS Recovery ug/L 240 <br /> LCS % Recovery 96 <br /> Percent Recovery Control Limits <br /> MSIMSD 60 140 <br /> F— LCS 70 130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sampie of known interferent free matrix that is analyzed using the same reagents <br /> "SEQUOIA L 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 specdied control limits due to matrix <br /> interference the LCS recover is to be used to validate the batch <br /> r <br />