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` / \ 680 Chesapeake Dnvc Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia <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 /> �llr <br /> is <br /> Blaine Tech Services, Inc Client Project 1D Chevron 9-4275 /971125-S1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9711 G19-04-06, 08 Reported Dec 15, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC120997BTEX06A GC120997BTEX06A GC120997BTEX06A GC120997BTEX06A GC120997BTEX06A <br /> Analy Method EPA 8020 EPA 6020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst C Demartini C Demartini C Demartini C Demartini C Demartini <br /> MS/MSD # 971245201 971245201 971245201 971245201 971245201 <br /> Sample Conc N D ND N D N D ND <br /> Prepared Date 12/9/97 12/9/97 12/9/97 12/9/97 12/9/97 <br /> Analyzed Date 12/9/97 12/9/97 12/9/97 12/9/97 12/9/97 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked 10Ng/L 10ug/L 10ug/L 30Ng/L 60pg/L <br /> Result 90 98 11 32 56 <br /> MS % Recovery 90 98 110 107 93 <br /> � <br /> Dup Result 10 11 12 35 63 <br /> MSD % Recov 100 110 120 117 105 <br /> RPD 11 12 87 90 12 <br /> RPD Limit 0-25 0-25 025 0-25 025 <br /> LCS #. BLK120997 BLK120997 BLK120997 BLK120997 BLK120997 <br /> Prepared Date 12/9/97 12/9/97 12/9/97 12/9/97 12/9/97 <br /> Analyzed Date 12/9/97 12/9/97 12/9/97 12/9/97 12/9/97 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked 101ig/L 10yg/L long/L 30frg/L 60ug/L <br /> LCS Result 10 11 12 37 66 <br /> LCS %Recov • 100 110 120 123 110 <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,interferent4ree matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTIrAL 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 /> Peggy Penner <br /> Project Manag r **MS=Matrix Spike,MSD-MS Duplicate,RPD=Relative%Difference 9711G19 BLA <3> <br />