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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9133. <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical <br /> 819 Sinker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> vo- <br /> 10 <br /> Blaine Tech Services, Inc Client Project lQ _Shell Stockton /971121-G2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order # 9711694 -01-04 Reported Dec 12, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC120597BTEX02A GC120597BTEX02A GC120597BTEX02A GC120597BTEX02A GC120597BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A. Miraftab A Miraftab A Miraftab A Miraftab A Miraftab <br /> MS/MSD # 9711D2102 9711D2102 9711D2102 9711D2102 9711D2102 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 12/5/97 12/5/97 12/5/97 12/5/97 12/5/97 <br /> Analyzed Date 12/5/97 12/5/97 12/5/97 12/5/97 12/5/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 pg/L 10 pg/L 10 fig/L 30 Yg/L 60 Mg/L <br /> Result 10 10 10 31 73 <br /> MS % Recovery 100 100 100 103 122 <br /> Dup Result 10 10 10 31 73 <br /> MSD % Recov 100 100 100 103 122 <br /> RPD 00 00 00 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # ELK120597 BLK120597 BLK120597 BLK120597 BLK120597 <br /> Prepared Date 12/5/97 12/5/97 12/5/97 12/5/97 12/5/97 <br /> Analyzed Date 12/5/97 12/5/97 12/5/97 12/5/97 12/5/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10jug/L long/L 10Ng/L 30lrg/L 60frg/L <br /> LCS Result 10 99 10 30 72 <br /> LCS % Recov 100 99 100 100 120 <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 /> SE A ALYTICAL preparation,and analytical methods employed for the samples The matrix spike Is an aliquot of sam <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure <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 /> Pe Penner - <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9711179481-A <1> <br />