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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 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 /> i <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-8632 /961105-C2 <br /> 985 Timothy Drive Matrix Liquid <br /> ' San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 9611260-04 Reported Nov 23, 1996 <br /> (,QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GC110796BTEX20A GC110796BTEX20A GC110796BTEX20A GC110796BTEX20A <br /> Analy. Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst G Fish G Fish G Fish G Fish <br /> MS/MSD# 961105901 961105901 961105901 961105901 <br /> Sample Conc ND N D ND ND <br /> Prepared Date 11/7/96 11/7/96 11/7/96 11/7/96 <br /> Analyzed Date 11/7/96 11/7/96 11/7/96 11/7/96 <br /> Instrument I D #- GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10 pg/L 10 Ng/L 10 pg/L 30 erg/L <br /> Result 11 91 87 25 <br /> MS % Recovery 110 91 87 83 <br /> Dup Result 11 83 81 24 <br /> MSD% Recov 110 83 81 80 <br /> RPD 00 92 71 41 <br /> RPD Limit- 0-25 0-25 0-25 0-25 <br /> LCS# BLK110796 BLK110796 BLK110796 BLK110796 <br /> Prepared Date: 11/7/96 11/7/96 11/7/96 11/7/96 <br /> Analyzed Date 11/7/96 11/7/96 11/7/96 11/7/96 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10pg/L 10ug/L 10ug/L 30pg/L <br /> LCS Result 11 84 82 25 <br /> LCS% Recov : 110 84 82 83 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA A ICAL 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 /> eggy Pe er <br /> Project M nager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9611260 BLA ¢3> <br />