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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 I <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Cambria Environmental Client Project Il] Shell,2494 Fremont, Stockton, CA to <br /> P 0 Box 259 Matrix Soil <br /> Sonoma, CA 95476-0259 <br /> Attention Mike Murphy QC Sample Group S804231 Reported May 12, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> MTBE Methanol Ethanol <br /> Method EPA 8260 ISHS/HS ISHS/HS <br /> Analyst L Zhu TS TS <br /> Concentration <br /> Spiked: 2,500 ug/kg 8 0 mg/kg 8 0 mg/kg <br /> LCS Batch# VMB0501 SA ISBLK050198 ISBLK050198 <br /> Date Prepared 04/29/98 05/01/98 05/01/98 <br /> Date Analyzed 05/01/98 05/01/98 05/01/98 <br /> Instrument I D# H6 GCV-01 GCV-01 <br /> LCS % <br /> Recovery 88 83 95 i. <br /> Control Limits- 70-130% 70-130% 70-130% <br /> MS/MSD ISBLK050198- ISBLK050198- <br /> Batch# 9804E2402 SPK SPK <br /> Date Prepared 04/23/98 05/01/98 05/01/98 <br /> Date Analyzed 04/25/98 05/01/98 05/01/98 <br /> Instrument 1 D# H6 GCV 01 GCV-01 <br /> Matrix Spike <br /> Recovery 72 109 121 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 72 108 123 <br /> Relative % <br /> Difference 00 12 10 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br />/SFEQUIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recoverydata is used forvalidation of sample batch results Oue to matrix effects,the QC limits for MS/MSD's are advisory onlyand are not used to accept or reject batch results <br /> Sc elder <br /> Manager/Sacramento Laboratory <br /> S804231 CES <7> <br />