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Sequoia 660 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> ex� 404 N Wiget Larne Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 i Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> I,1V 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 /> 1680 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 # GC032399BTEX02A <br /> Sample No 9903653-05 <br /> Date Prepared 3123199 3/23199 3123199 3123199 <br /> Date Analyzed 3123199 3123199 3123199 3123199 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Cone , ug/L N D N D 0 6 N D <br /> Cone Spiked, ug/l. 10 10 10 30 <br /> Matrix Spike ug/L 94 9 1 9 6 28 <br /> % Recovery 94 91 90 93 <br /> Matrix <br /> Spike Duplicate, ug/L 9 9 9 6 10 29 <br /> % Recovery 99 96 94 97 <br /> Relative % Difference 5 2 5 3 43 42 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC0323993TEX02A- - - <br /> Date Prepared 3123199 3123199 3123199 3123199 <br /> Date Analyzed 3123199 3123199 3123199 3123/99 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked, ug/L 10 10 10 30 <br /> I <br /> LCS Recovery ug/L 96 9 6 9 5 29 <br /> LCS % Recovery 96 96 95 97 <br /> - - - Percent Recovery Control Limits - - _ - <br /> MSIMSD 60140 60 140 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 /> u -- SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> ~-' fomfted with known quantities of specific compounds and subfected to the entire analytical procedure if <br /> i <br /> t •� the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Men Me: Shin <br /> Project Manager <br />