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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 /> IWOi <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-8264 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9802909-03-04 Reported Feb 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO22398802004A GCO22398802004A GCO22398802004A GCO22398802004A GCO22398802004A <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 K Nill K Nill K Nill K Nil] K Nill <br /> MS/MSD # 8021247 8021247 8021247 8021247 8021247 <br /> Sample Conc N D N D N D NO N D <br /> Prepared Date 2/23/98 2/23/98 2/23/98 2/23/98 2/23/98 <br /> Analyzed Date 2/23/98 2/23/98 2/23/98 2/23/98 2/23/98 <br /> Instrument I D # HP4 HP4 HP4 HP4 HP4 <br /> Conc Spiked 20 pg/L- 20 ug/L 20 ug/L 60 ug/L 340 ug/L <br /> Result 17 18 17 55 300 <br /> MS % Recovery 85 90 85 92 94 <br /> 0 Dup Result 18 19 18 56 310 <br /> MSD % Recov 90 95 90 93 97 <br /> RPD 57 54 57 18 33 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS022398 LCS022398 LCS022398 LCS022398 LGS022398 <br /> Prepared Date 2/23/98 2/23/98 2/23/98 2/23/98 2/23/98 <br /> Analyzed Date 2/23/98 2/23/98 2/23/98 2/23/98 2/23/98 <br /> Instrument I D # HP4 HP4 HP4 HP4 HP4 <br /> Conc Spiked 20 ug/L 20 ug/L 20 ug/L 60ug/L 340 jig/L <br /> LCS Result 17 17 17 53 300 <br /> LCS % Recov 85 85 85 88 94 <br /> 60-140 60-140 60140 60140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> SE 'U A N LYTICAL The LCS is a control sample of known interferent-free matrix that is analyzed using the same reagents <br /> ,flap 1 1 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 /> Peg y en er <br /> Proje anager **MS=Matrix Spike MSD=MS Duplicate, RPD=Relative% Difference 9802909 BLA <4> <br />