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1 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (925)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 /> r1l <br /> nvironmenta) Group Client Project ICS Unocal 0123, Tracy, CA v <br /> unrise Gold Circle, Ste M Matrix Water <br /> Rancho Cordova, CA 95742 <br />' -Attention Mike Mitchener QC Sample Group S810088 Reported Oct 16, 1998 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Tetra- <br /> Acetone MIBK hydrofuran 1,1,1-TCA TCE p Xylene <br /> Method ISHS ISOL ISOL ISOL ISOL [SOL <br />' Analyst TS TS TS TS TS TS <br /> Concentration <br /> Spiked 4 0 mg/L 1 0 mg/L 2 0 mg/L 1 0 mg/L 1 0 mg1L 0 20 mg/L <br /> LCS. Batch#- ISWLCS1 ISWLCS1 ISINLCS1 ISWLCS1 ISWLCSI 1SWLCSI <br /> 101298 101298 - 101298 101298 101298 101298 - <br /> Date Prepared 10/12/98 90/12/98 10/12/98 10/12/98 10/12/98 10/12/98 <br />' Date Analyzed 10/12/98 10/12/98 10/12/98 10/12/98 10/12/98 10/12198 <br /> Instrument I D.# GCV-01 GCV-01 GCV-01 GCV-01 GCV-01 GCV-01 <br /> LCS % <br /> Recovery 80 88 85 88 92 95 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> 1 <br /> MSIMSD <br />' Batch # 9810739-01 9810739-01 9810739-01 9810739-01 9810739-01 9810739-01 <br /> Date Prepared 10/12/98 10/12/98 10/12/98 10/12/98 10/12/98 10/12/98 <br /> Date Analyzed 10/12/98 10/12/98 10/12/98 10/12/98 10/12/98 10/12/98 <br /> ' Instrument I D.# GCV-01 GCV-01 GCV-01 GCV-01 GCV-01 GCV-01 <br /> Matrix Spike <br /> % Recovery 83 91 95 89 86 85 <br /> ' Matrix Spike <br /> Duplicate% <br /> ' Recovery 80 87 95 87 87 85 <br /> Relative % <br /> Difference 31 45 00 23 1 2 00 <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 /> jei and are not used to accept or reject batch results <br /> JLP'irn�daeC S hneider <br /> oject Manager/Sacramento Laboratory <br /> S810088 PES <6> <br /> 1 <br />