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Sequoia680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364.9233 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988-9673 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (9 16) 921 9600 FAX(9t6) 92[ 0100 0- Delta Environmental Consultants Client Project lD Exxon #7-3708, Stockton, CA '3164 Gold Camp Dr, Suite 200 Matrix Water Rancho Cordova, CA 95670 Attention C Keoni Almeida QC Sample Group 6080074-81 Reported Aug 9, 1996 QUALITY CONTROL DATA REPORT ANALYTE Ethyl- Benzene Toluene Benzene Xylenes Method' EPA 8020 EPA 8020 EPA 8020 EPA 8020 Analyst' V Owens V Owens V Owens V Owens Concentration Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L LCS Batch# LCS080696 LCS080696 LCS080696 LCS080696 Date Prepared 08/06/96 08/06/96 08/06/96 08/06/96 Date Analyzed. 08/06/96 08/06/96 08/06/96 08/06/96 Instrument LD # GCHP-2 GCHP-2 GCHP-2 GCHP-2 LCS % Recovery 95 96 96 97 Control Limits. 70-130 70-130 70-130 70-130 MS/MSD Batch #" 6080074 6080074 6080074 6080074 Date Prepared 08/05/96 08/06/96 08/06/96 08/06/96 Date Analyzed 08/05/96 08/06/96 08/06/96 08/06/96 Instrument 1.10 # GCHP-2 GCHP-2 GCHP 2 GCHP 2 Matrix Spike % Recovery 94 93 91 86 Matrix Spike Duplicate % Recovery 96 97 966 90 i I Relative % Difference 21 42 53 45 I I SEQUOIA ANALYTICAL Please Note / 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 a recovery data 1s used for validation of sample batch results Due to matrix effects the OC limits for MS/MSD s are advisory only Linda C Schneider and are not used to accept or reject batch results ✓ f Project Manager/Sacramento Laboratory s080074 DLT <s>