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• � Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX (650)364 9233 <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 /> Blame Tech Services, Inc Client Project ID Chevron 9-4275 /971125-S1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran`fhie Work Order# 9711G19 -01-02, 07, 09, Reported Dec 15, 1997 <br /> 9711 G20-01-02 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GC120997BTEX18A GC1209976TEX18A GC120997BTEX18A GC120997BTEX18A GC120997BTEX18A <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 C Demartini C Demartini C Demartinl C Demartini C Demartini <br /> MS/MSD # 971205203 971205203 971205203 971205203 971205203 <br /> Sample Conc ND N D N D NO N D <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 # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked 10)Jg/L 10 jig/L 10 ug/L 30 yg/L 60 ug/L <br /> Result 77 87 89 28 58 <br /> �MS % Recovery 77 87 89 93 97 <br /> Dup Result 8 1 90 92 29 61 <br /> MSD % R@COV 81 90 92 97 102 <br /> RPD 51 34 33 35 50 <br /> RPD Limit 0-25 025 025 025 025 <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 # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc. Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> LCS Result 80 90 93 29 60 <br /> LCS % Recon so 90 93 97 100 <br /> 60-140 50-140 60-140 50-140 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 /> 4wEOUOIA 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 /> Peggy enn r <br /> Project Man er **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9711G19 BLA <1> <br /> �6d' <br />