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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 /> %70 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 Of 00 <br /> 1101 <br /> Blame Tech Services, Inc Client Project ID Shell Stockton/970206-H1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9702584-03 Reported Feb 21, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GCO21997BTEX03A GCO21997BTEX03A GCO21997BTEXOSA GCO21997BTEX03A <br /> Analy Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst. D Jirsa D Jirsa D Jirsa D Jirsa <br /> MS/MSD # 970235105 970235105 970235105 970235105 <br /> Sample Cone N D N D ND N D <br /> Prepared Date 2/19/97 2/19/97 2/19/97 2/19/97 <br /> Analyzed Date 2/19/97 2/19/97 2/19/97 2/19/97 <br /> Instrument 1 D.#: GCHP03 GCHP03 GCHP03 GCHP03 <br /> Cone Spiked 10ug/L IC)pg/L 10pg/L 30yg/L <br /> Result 54 55 58 14 <br /> WS % Recovery 54 55 58 47 <br /> Dup Result 11 11 11 31 <br /> MSD % Recov 110 110 110 103 <br /> RPD 68 67 62 76 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK021997 BLK021997 BLK021997 BLK021997 <br /> Prepared Date 2/19/97 2/19/97 2/19/97 2/19/97 <br /> Analyzed Date 2/19/97 2/19/97 2/19/97 2/19/97 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Cone Spiked. 10yg/L 10pg/L 10pg/L 30ug/L <br /> LCS Result 10 11 11 29 <br /> LCS % Recov 100 110 110 97 <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-fres matrix that Is analyzed using the same reagents, <br /> U 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 /> 1Pegy Penner <br /> prJJJect Manager *"MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9702584 SLA <2> <br />