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' ® Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br />,*Cambria rmnvironmental dlient Project fb Shell, 341 Last Main St, -Ripon, CA <br /> 144 65th St , Suite C Matrix Soil <br /> (Oakland, CA 94608 <br /> Attention Owen Ratchye QC Sample Group S807204 Reported Aug 3, 1998 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> MTBE MTBE MTBE Methanol Methanol Methanol <br /> Method EPA 8260 EPA 8260 EPA 8260 ISHS ISMS ISHS <br /> Analyst LD/SG LDISG LZ/SG TS TS TS <br /> I Concentration <br /> Spiked 2,500 pg/kg 2,500 pglkg 2,500 pg/kg 8 0 mglkg 8 0 mg/kg 8 0 mg/kg <br /> LCS Batch# VMB0723S VMB0724S VMB0722S ISBLK072398/ ISBLK072298/ SBLK0722981 <br /> I SPK SPK SPK/B <br /> Date Prepared 07/22/98 07/24/98 07/22/98 07/23/98 07/22/98 07/22/98 <br /> Date Analyzed 07/23/98 07/24/98 07/22/98 07/23/98 07/22/98 07/22/98 <br /> Instrument I D# H6 H6 H6 GCV-01 GCV-01 GCV-01 <br /> LCS% <br /> Recovery 88 100 96 106 105 113 <br /> 6 Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> IMSIMSD h <br /> Batch # 9807B10-01 9807894-07 9807810-01 IS9807C66-01 IS9807587-03 IS9807687-03 <br /> Date Prepared 07/21/98 07/22/98 07/21/98 07/23/98 07/15/98 07/15/98 <br /> Date Analyzed 07/21/98 07/22/98 07/21/98 07/23/98 07/15/98 07/15/98 <br /> Instrument I D#. H6 H6 H6 GCV-01 GCV-01 GCV-01 <br /> IMatrix Spike <br /> % Recovery. 92 100 92 85 104 104 <br /> I Matrix Spike <br /> Duplicate% <br /> Recovery 96 92 96 86 110 110 <br /> I Relative % <br /> Difference 4 3 80 43 15 58 58 <br /> Please Note <br /> The LCS 1s a control sample of known, interferent free matrix that 1s 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 reject batch results <br /> n a C Schneider <br /> ro�ect Manager/Sacramento Laboratory <br /> S807204 CAM <14> <br />