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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 4 1 41 1) 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988.9673 <br /> 1 Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> Blaine Tech Services, Inc bienf Project ID Shell Stockton /971121-G2 h h <br /> 1680 Rogers Ave Matrix Liquid <br /> '-San Jose, CA 95112 <br /> }Attention Fran Thie Work Order# 9711 E94-05-07 Reported Dec 12, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# G131205976TEX21A GC120597STEX21A GC120597BTEX21A GC120597BTEX21A GC120597BTEX21A <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#. 9711G1506 9711G1506 971161506 971IG1506 971161506 <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 # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked 10 fig/L 10 fig/L 10 fig/L 30 fig/L 60 fig/L <br /> Result 97 98 10 30 62 <br /> MS % Recovery 97 98 100 100 103 <br /> . Dup. Result 10 10 11 30 61 <br /> MSD % Recov 100 100 110 100 102 <br /> RPD 30 20 95 00 16 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK120597 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 #. GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked- 10 fig/L 10 fig/L 10 fig/L 30 fig/L 60 fig/L <br /> LCS Result 96 99 10 30 65 <br /> LCS % Recov 96 99 100 100 108 <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 /> �101 YTICAL 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 /> Pr <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative %Difference 9711E94 BLA <2> <br />