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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 /> Blaine Tech Services, Inc' Client Project ID l Shell Stockton/970708-F1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9707594-04 Reported Jul 28, 1997 s <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GC072197BTEX03A GC072197BTEX03A GC072197BTEX03A GCO72197BTEX03A GC072197BTEX03A <br /> Analy. Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: D Jirsa D Jirsa D Jirsa D Jirsa D Jirsa <br /> M S/MSD#: 970780301 970780301 970780301 970780301 970780301 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 7/21/97 7/21/97 7/21/97 7/21/97 7/21/97 <br /> Analyzed Date 7/21/97 7/21/97 7/21/97 7/21/97 7/21/97 <br /> Instrument LD #: GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc. Spiked. 10ug/L 10ug/L 10pg/L 30Ng/L 60pg/L <br /> Result. 9 2 91 91 25 72 <br /> % Recovery. 92 91 91 83 120 <br /> Dup. Result 91 90 8 9 25 72 <br /> MSD % Recov 91 90 89 83 120 <br /> RPD. 11 11 22 00 00 <br /> RPD Limit. 0-25 0-25 0-25 0-25 0-25 <br /> LCS#. BLK072197 BLK072197 BLK072197 BLK072197 BLK072197 <br /> Prepared Date. 7/21/97 7/21/97 7/21/97 7/21/97 7/21/97 <br /> Analyzed Date. 7/21/97 7/21/97 7/21/97 7/21/97 7/21/97 <br /> Instrument I D #- GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10yg/L 10pg/L 10frg/L 30ug/L 60Ng/L <br /> LCS Result. 90 88 88 25 70 <br /> LCS % Recov 90 88 88 83 117 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 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 /> U I 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 /> enner <br /> P Manager *"MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9707594 BLA c3? <br />