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ID Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 Pacific Environmental Group Client Project ID 920-119 1A/Chevron 9-6171 11315 Sunrise Gold Circle, Ste M Matrix Soil Rancho Cordova CA 95742 Attention Tim Anenson CC Sample Group 801-0987 Reported Feb 12, 1998 QUALITY CONTROL DATA REPORT ANALYTE Ethyl- Benzene Toluene Benzene Xylenes Diesel Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 DHS LUF T Analyst MC M C M C M C 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# LCS020298 LCS020298 LC8020298 LCS020298 LCS020298 Date Prepared 02/02/98 02/02/98 02/02/98 02/02/98 02/02/98 Date Analyzed 02/02/98 02/02/98 02/02/98 02/02/98 02/02/98 Instrument I D # GCHP 1 GCHP-1 GCHP-1 GCHP 1 GCHP 36 LCS % Recovery 114 111 114 112 91 Control Limits 70 130% 70 130% 70 130% 70-130% 60-140% MS/MSD Batch # 8010987 8010987 8010987 8010987 8010925 Date Prepared 02/02/98 02/02/98 02/02/98 02/02/98 02/02/98 Date Analyzed 02/02/98 02/02/98 02/02/98 02/02/98 02/03/98 Instrument I D # GCHP 1 GCHP-1 GCHP-1 GCHP-1 GCHP-3B Matrix Spike % Recovery 82 80 84 86 Matrix Spike Duplicate% Recovery 86 86 90 91 Relative% Difference 4 8 72 6 8 56 SEQUOIA ANALYT AL Please Note The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents 7PIr preparation and analytical methods employed for the samples The LCS% recovery data is used for validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only C Schneider and are not used to accept or reject batch results *Matrix Interference t Manager/Sacramento Labors ory 8010987 PES <9>