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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 �rill� Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 Pacific Environmental Group Client Project ID 920 122 1A/Chevron 9-9840 11315 Sunrise Gold Circle, Ste M Matrix Soil Rancho Cordova, CA 95742 Attention Tlm Anenson CC Sample Group 8030061-0070, 0074 Reported Mar 5, 1998 QUALITY CONTROL DATA REPORT ANALYTE Ethyl- Benzene Toluene Benzene Xylenes Diesel ' Method EPA 8024 EPA 8020 EPA 8020 EPA 8020 DHS LUFT Analyst C Lee C Lee C Lee C Lee C Lee Concentration Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 12 5 mg/kg LCS Batch# LCS030398 LCSW0398 LCS030398 LCS030398 LCS030498 ' Date Prepared 03/03/98 03/03/98 03/03/98 03/03/98 03/04/98 Date Analyzed 03/03/98 03/03/98 03/03/98 03/03/98 03/04/98 Instrument I D # GCHP 1 GCHP-1 GCHP-1 GCHP 1 GCHP-3B LCS Recovery 93 90 92 92 92 ' Control Limits 70-130% 70-130% 70-130% 70-130% 60-140% ' MS/MSD Batch # 8030062 8030062 8030062 8030062 8030081 Date Prepared 03/03/98 03/03/98 03/03/98 03/03/98 03/04/98 i Date Analyzed 03/03/98 03/03/98 03/03/98 03/03/98 03/05/98 Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP 3B Matrix Spike % Recovery 80 76 82 83 93 Matrix Spike Duplicate% Recovery 79 79 82 82 93 ' Relative Difference 1 2 1 3 0 0 t 2 0 0 SEQUOIA ANALYTICAL Please Note r The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, �� preparation and analytical methods employed for the samples The LCS%recovery data is used for L validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only in a C Schneider and are not used to accept or reject batch results Project Manager/Sacramento Labors ory 8030061 PES <13> fix"