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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 /> qwr <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton / 961025-H1 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 961 OH37-11 Reported Nov 14, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC103096BTEX18A GC103096BTEX18A GC103096BTEX18A GC103096BTEX18A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst R Geckler R Geckler R Geckler R Geckler <br /> MS/MSD # 961069107 961089107 961069107 961089107 <br /> Sample Conc N D ND N D N D <br /> Prepared Date 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Analyzed Date 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked 1opg/L lopg/L 10ug/L 30pg/L <br /> Result 89 92 9 2 28 <br /> MS % Recovery 89 92 92 93 <br /> Dup Result 7 9 92 81 25 <br /> MSD % Recov 79 92 81 83 <br /> RPD 12 0 0 13 11 <br /> RPD Limit 0-25 025 0-25 025 <br /> LCS # BLK103096 BLK103096 BLK103096 BLK103096 <br /> Prepared Date 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Analyzed Date 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked 10l1g/L 10 pg/L 10 ug/L 30lrg/L <br /> LCS Result 91 89 85 27 <br /> LCS % Recov 91 89 85 90 <br /> MS/MSD 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70130 70130 <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 /> EOl 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 /> eg enner <br /> r ject Manager **MS=Matrix Spike, MSD=MS Duplicate, RPI)=Relative%Difference 951OH37 BLA <4> <br />