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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> a- ) <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blame Tech Services, Inc Client Project ID Chevron 9-6171, 981118-K1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Christine Lillie Work Order# 9811 D34-02-08 Reported Dec 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC Batch# GC112498802004A GC112498802004A GC112498802004A GC112498802004A GC112498802004A <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 Westwater C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD # 8111598 8111598 8111598 8111598 8111598 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 11/24/98 11/24/98 11/24/98 11/24/98 11/24/98 <br /> Analyzed Date 11/24/98 11/24/98 11/24/98 11/24/98 11/24/98 <br /> Instrument I D # HP4 HP4 HP4 HP4 HP4 <br /> Conc Spiked 20 Mg/L 20 jug/L 20yg/L 60 yg/L 350,ug/L <br /> Result 22 18 21 70 360 <br /> MS % Recovery 110 90 105 117 103 <br /> Dup Result 23 20 21 70 360 <br /> MSD % Recov 115 100 105 117 103 <br /> RPD 44 105 00 00 00 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS# LC8112498 LCS112498 LCS112498 LCS 112498 LCS112498 <br /> Prepared Date 11/24/98 11/24/98 11/24/98 11/24/98 11/24/98 <br /> Analyzed Date 11/24/98 11/24/98 11/24/98 11/24/98 11/24/98 <br /> Instrument I D # HP4 HP4 HP4 HP4 HP4 <br /> Conc Spiked 20ug/L 20yg/L 20jig/L 609g/L 350yg/L <br /> LCS Result- 23 19 20 69 350 <br /> LCS % Recov 115 95 100 115 100 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 60-140 <br /> Control Limits <br /> Please Mote <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br />. Elap#1271 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 /> We ry <br /> r e anager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9811D34 BLA <2> <br />