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Sequoia 680 Chesapeake Drive Redwood CIM CA 94063 (650) 364 9600 FAX(650)364 9233 a -1 404 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 10 920 122 1 A/Chevron 9-9840 11315 Sunrise Gold Circle, Ste M Matrix Sol] Rancho Cordova, CA 95742 Re orted Mar 5, 1998 Attention Tim Anenson QC Sample Group 8030061-0070, 0074 p 1 QUALITY CONTROL DATA REPORT Chloro- ANALYTE. 1,1-Dichloro- ethene Trichloroethene Benzene Toluene benzene Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 1Analyst K Pocan K Pocan K Pocan K Pocan K Pocan Concentration Spiked 2,500pg/kg 2,500 pg/kg 2,500 Ng/kg 2,500�g/kg 2,500�t9/k9 LCS Batch# LCS030598 LCS030598 LCS030598 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 F1 LCS % Recovery 121 110 110 los 101 Control Limits 65-135% 70-130% 70-130% 70-130% 70-130% ' MS/MSD Batch# 8020579 8020579 8020579 6020579 8020579 Date Prepared 03/02/98 03/02/98 03/02/98 03/02/98 03/02/98 Date Analyzed 03/02/98 03/02/98 03/02/98 03/02/98 03/02/98 Instrument I D # MS-F1 MS-F1 MS-F1 MS-F1 MS 1=1 Matrix Spike % Recovery 171 125 129 119 120 Matrix Spike ' Duplicate% Recovery 126 122 125 112 109 Relative ' Difference 30 2 4 3 2 {i 1 9 6 Please Note The LCS is a control sample of known,interferent free matrix that Is analyzed using the sarne reagents, SEQU A ANAL.YTICA 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 acce pt or re lect batch results da C Schneider rolect Manager/Sacramento Laboratory .414> 8030051 PES