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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 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 Sod Rancho Cordova, CA 95742 Attention Tim Anenson QC Sample Group 8030071-0073, 0077 Reported Mar 1 i, 1998 QUALITY CONTROL DATA REPORT ANALYTE 1,1-Dichlora- Chloro- ethene Trichloroethene Benzene Toluene benzene Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 Analyst K Pocan K Pocan K Pocan K Pocan K Pocan Concentration Spiked 2,500 Ng/kg 2,50oNg/kg 2,500ug/kg 2,500 pg/kg 2,500 pg/kg LCS Batch# LCS030598 LCS030598 LCSo30598 LCS030598 LCS030598 Date Prepared 03/05/98 03/05/98 03/05/98 03/05/98 03/05/98 Date Analyzed 03/05/98 03/05/98 03/05/98 03/05/98 03/05/98 Instrument I D # MS-F1 MS-F1 MS-F1 MS-F1 MS-171 LCS Recovery 121 111 110 los 101 Control Limits 65-135% 70-130% 70-130% 70-130% 70-130% MS/MSD Batch # 8020579 8020579 8020579 6020579 8020579 Date Prepared 03/05/98 03/05/98 03/05/98 03/05/98 03/05/98 Date Analyzed 03/05/98 03/05/98 03/05/98 03/05/98 03/05/98 Instrument 1 D # MS-F1 MS-F1 MS-F1 MS-F1 MS-F1 Matrix Spike % Recovery 171 125 129 120 120 Matrix Spike Duplicate Recovery 126 122 125 113 109 Relative Difference 30 23 37 6 D 9 5 Please Note The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents SEQUOIA ANAL ICAL 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/MSD's are advisory only and are not used to accept or reject batch results dl inda C neider Project Manager/Sacramento Laboratory 8030071 PES <21>