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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, 6131 Pacific Ave Stockton nv <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Glen Bennett OC Sample Group 3DD9001-04 Reported May 6, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes <br /> Method. EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: M Nipp M Nipp M Nipp M Nipp <br /> Corte. Spiked: 10 10 10 30 <br /> Units: ug/L ug/L pg/L ug/L <br /> LCS Batch#. GBLK050393 GBLK050393 GBLK050393 GBLK050393 <br /> Date Prepared: N/A N/A N/A N/A <br /> Date Analyzed: 5/3/93 5/3/93 5/3/93 5/3/93 <br /> Instrument I D.#` GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 83 82 82 so <br /> Control Limits. 80-120 80.120 80-120 80-120 <br /> MS/MSD <br /> Batch #' GMC-6401 G3DC6401 G3DC6401 G3DC6401 <br /> Date Prepared: N/A N/A N/A N/A <br /> Date Analyzed: 5/3/93 5/3/93 5/3/93 5/3/93 <br /> Instrument I.D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> %Recovery: 84 83 83 83 <br /> Matrix Spike <br /> Dupticate% <br /> Recovery, 98 97 97 97 <br /> Relative% <br /> Difference* 15 16 16 15 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS as 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/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> —Mkda Lee <br /> Protect Manager 3DD9001 BLA <2> <br />