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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4D 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> is <br /> Gettler Ryan/Geostrategies Client Project ID Chevron 9-6171, Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803027-03-07 Reported Mar 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC031098BTEX03A GCO31098BTEX03A GC031098BTEXO3A GCO31098STEX03A GC031098BTIX03A <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 DeMartinj C DeMartini C DeMartini C DeMartini C DeMartini <br /> MS/MSD # 980218901 980218901 980218901 980218901 980218901 <br /> Sample Cone N D N D N D N D ND <br /> Prepared Date 3/10/98 3/10/98 3/10/98 3/10/98 3/10/98 <br /> Analyzed Date 3/10/98 3/10/98 3/10/98 3/10/98 3/10/98 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Cone Spiked 10pg/L 10pg/L 10ug/L 30,ug/L 60 jtg/L <br /> Result 94 93 94 28 61 <br /> MS % Recovery 94 93 94 93 102 <br />. Dup Result 92 90 91 28 60 <br /> MSD % Recov 92 90 91 93 100 <br /> RPD 22 33 32 00 17 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK031098 BLK031098 BLK031098 BLK031098 BLK031098 <br /> Prepared Date 3/10/98 3/10/98 3/10/98 3/10/98 3/10/98 <br /> Analyzed Date 3/10/98 3/10/98 3/10/98 3/10/98 3/10/98 <br /> Instrument 1 D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Cone Spiked 10pg/L 10 jtg/L 10ftg/L 30Ng/L 60Etg/L <br /> LCS Result 94 92 94 28 62 <br /> LCS % Recov 94 92 94 93 103 <br /> 60-140 60-140 50-140 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 />"regory <br /> SEQUOIA A ALYTICAL 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 tf <br /> the recovery of analytes from the matrix spike does not fail within specrfled control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> jnager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9803027 GET e2} <br />