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.' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1665 FAX(707)792-0342 Blaine Tech Services, Inc Client Project ID Chevron 9-9840/981223-L1 1680 Rogers Ave Matrix Liquid San Jose, CA 95112 Attention Christine Lillie Work Order # 9812G28-01-03 Reported Jan 12, 1999 QUALITY CONTROL DATA REPORT Analyte Methanol Ethanol Iso-Propanal CSC Batch# GC1231981SHSHSB GC1231981SHSHSB GC1231981SHSHSB Analy Method ISHS ISMS 1SHS Prep Method HS HIS HS Analyst T Sorokin T Sorokin T Sorokin MS/MSD # 9812C7001 981207001 9812C7001 Sample Conc 4 8 N D N D Prepared Date 12/31/98 12/31/98 12/31/98 Analyzed Date 12/31/98 12/31/98 12:/31/98 Instrument 10 # GCV1 GCV1 GCV1 Conc Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L Result 79 87 91 MS % Recovery 39 109 114 Dup Result 77 82 90 MSD % Recov 36 103 113 RPD 26 59 11 RPD Limit 0.50 0-50 0-50 LCS # LCS123198 LCS123198 LCS123198 Prepared Date 12/31/98 12/31/98 12/31/98 Analyzed Date 12/31/98 12/31/98 12/31/98 Instrument I D # GCV1 GCV1 GCV1 Conc Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L LCS Result 78 86 88 LCS % Recov 95 108 110 50-150 50-150 50-150 LCS 70130 70-130 70130 Control Limits Please Note The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sampie fortified with known quantities of specific compounds and subjected to the entire analytical procedure If the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix interference the LCS recovery is to be used to validate the batch regory lect Manager MS=Matrix Spike MSD=MS Duplicate RPD=Relative% Difference 9812G28 SLA <2>