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/ SEQUOIA ANALYTICAL <br /> - 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID Shell, 420 W Kettlemen <br /> 985 Timothy Drive Matra Water <br /> San Jose, CA 95133 <br /> Attention Glen Bennett QC Sample Group 3D64801-04 Reported Apr 22, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE _thyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> Conc. Spiked 10 10 10 30 <br /> Units. ug/L ug/L i1S/L u9/L <br /> LCS Batch# GBLK042193 GBLKO42193 GBLKG42193 GBLK042193 <br /> Date Prepared- N/A N/A N/A N/A <br /> Date Analyzed 4/21/93 4/21/93 4/21/93 4/21/93 <br /> Instrument I D # GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> LCS % <br /> Recovery- 84 a5 85 83 <br /> Control Limits 80-120 80.120 80-120 80-120 <br /> MS/MSD <br /> Batch# G3064702 G31364702 G3064702 G3D64702 <br /> Date Prepared. N/A N/A N/A N/A <br /> Date Analyzed: 4/21/93 4121/93 4/21/93 4/21/93 <br /> Instrument I D.#' GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> Matrix Spike <br /> % Recovery* 84 85 a5 87 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 99 99 98 100 <br /> Relative% <br /> Difference 16 15 14 14 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> . ` 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/MSDs are advisory only <br /> f and are not used to accept or reject batch results <br /> al e <br /> Pro) CV eager 3D64801 BLA <2> <br />