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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 (925)988-9600 FAX(925)988-9673 <br /> a� 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)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 /> Blaine Tech Services Client Project ID Chevron 9-42751990310-Z1 <br /> 1$80 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Christine Lillie QC Sample Group 9903653-01,02,04-11 Reported Mar 26, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> _ Analyst _ _ MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC032399BTEX03A <br /> Sample No 9903668-01 <br /> Date Prepared 3123/99 3123199 3123/99 3123/99 <br /> Date Analyzed 3123199 3123/99 3123/99 3123/99 <br /> Instrument I D# GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Cone , ug/L N D N D N D N D <br /> Cone Spiked, ug/L 10 10 10 30 <br /> Matrix Spike ug/L 11 11 11 33 <br /> % Recovery 110 110 110 110 <br /> Matrix <br /> Spike Duplicate, ug/L 11 11 11 33 <br /> % Recovery 110 110 110 110 <br /> i <br /> Relative % Difference 0 0 00 00 00 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC032399BTEX03A w <br /> Date Prepared 3/23/99 3123/99 3123/99 3/23/99 <br /> Date Anaiyzed 3/23199 3123/99 3123/99 3123199 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conc Spiked ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 9 4 10 10 31 <br /> LCS % Recovery 94 100 100 103 <br /> - = Percent Recovery Control Limits - - - I - - -- - -- — - <br /> F- <br /> MSIMSD 80140 60140 60140 60140 <br /> LCS 70130 70130 70130 70130 <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 preparavon and analytical methods employed for the samples The matrix spike is an aiiquot 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 specrim al control kmits due to matrix <br /> Laminterference the LCS recovery is to be used to validate the batch <br /> Mel Mel Shin <br /> Project Manager <br />