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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Pacific 5nvlronmental Group Client Project ID Tosco 5417, Manteca, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Mike Mitchener QC Sample Group S808248 Reported Sep 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Chloro- <br /> ethene Trichloroethene Benzene Toluene benzene <br /> Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> Analyst N Nelson N Nelson N Nelson N Nelson N Nelson <br /> Concentration <br /> Spiked 50 pg/L 50 pg/L 50 pg1L 50 pg/L 50 pg/L <br /> LCS Batch# LCS083198A LCS083198A LCS083198A LCS083198A LCS083198A <br /> Date Prepared 08/31/98 08/31/98 08/31/98 08/31/98 08/31/98 <br /> Date Analyzed* 08/31/98 08/31/98 08/31/98 08/31/98 08/31/98 <br /> Instrument I D# GCIMS-2 GCIMS-2 GUMS-2 GC/MS-2 GC/MS-2 <br /> LCS % <br /> Recovery 98 106 98 104 108 <br /> Control Limits 65-135% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch #' 8081854 8081854 8081854 8081854 8081854 <br /> Date Prepared 08/31/98 08/3098 08/31/98 08/31/98 08/31/98 <br /> Date Analyzed 08131/98 08/31/98 08/31/98 08131/98 08/31/98 <br /> Instrument I D#. GCIMS-2 GCIMS-2 GCIMS-2 GCIMS-2 GC/MS-2 <br /> Matrix Spike <br /> % Recovery 100 104 100 100 108 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 92 100 92 94 100 <br /> Relative % <br /> Difference. 83 3 9 83 62 77 <br /> Please Note <br /> The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS %recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> and are not used to accept or resect batch results <br /> Linda C and <br /> Project Manager/Sacramento Laboratory <br /> S808248 PES <10> <br />