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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364 9233 <br /> 404 N Wiset Lane Walnut Creek,CA 94598 (925)988 9600 FAX(925)938 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9(6)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792 1865 FAX(707)792-0342 <br /> CON - bac <br /> Client Project ID I13C Stocton <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Deanna Santos QC Sample Group S808121 <br /> Reported Aug 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> MTBE <br /> Method EPA 8260 <br /> Analyst N Nelson <br /> Concentration <br /> Spiked 50 fig/L r <br /> LCS Batch# LCS082598A <br /> Date Prepared 08/25/98 <br />]ate Analyzed 08/25/98 <br />'tstrument I D # GC/MS-2 <br /> LCS % <br /> Recovery 126 <br /> trol Limits 65-135% <br /> MS/MSD v n n <br /> Batch # 8081465 <br /> Date Prepared 08/25/98 <br /> ate Analyzed 08/25/98 <br /> strument I D# GC/MS-2 <br /> Matrix Spike <br /> % Recovery 114 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 120 <br /> Relative % <br /> Difference 51 <br /> ease Note <br /> The LCS Is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br />�UOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> �l J validation of sample batch results Due to matrix effects,the QC limits for MS/Mve are advisory only <br /> X11 (.�� � and are not used to accept or refect batch results <br />> N Bobel <br /> iec Manager/Sacramento Laboratory <br /> 5808121 EMC <4> <br />