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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> X1,,1 Analytical 819 Stnkcr Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> E A Engineering Science &Tech Client Project ID Exxon 7-0137/ 5150137 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9701A73 03-06 Reported Jan 31, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GCO12497BTEX02A GCO12497BTEX02A GCO12497BTEX02A GC012497BTEX02A <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# 970167502 970167502 970167502 970167502 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 1/24/97 1/24/97 1/24/97 1/24/97 <br /> Analyzed Date 1/24/97 1/24/97 1/24/97 1/24/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Cont: Spiked 10pg/L 10pg/L 10Ng/L 30yg/L <br /> Result 87 87 87 29 <br /> MS % Recovery 87 87 87 97 <br /> Dup Result 87 87 87 29 <br /> MSD % Recov 87 87 87 97 <br /> RPD 00 00 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK012497A BLK012497A BLK012497A BLK012497A <br /> Prepared Date 1/24/97 1/24/97 1/24/97 1/24/97 <br /> Analyzed Date 1/24/97 1/24/97 1/24/97 1/24/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conic Spiked 10pg/L 10ug/L 10pg/L 30ug/L <br /> LCS Result 89 89 89 29 <br /> LCS % Recov 89 89 89 97 <br /> 60.140 60.140 60-140 60-140 <br /> 1LCS 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 /> ANALYTI AL 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 H <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 valtdate the batch <br /> !e4vinFollett <br />' Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9701A73 EEE <2> <br /> A <br />