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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 3649233 <br /> Blaine Tech Services, Inc Client Project ID Shell, 6131 Pacific Ave Stockton <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 Benizene X enes <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: pg/L ug/L ug/L pg/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-3 GCHP-3 GCHP-3 GCHP-3 <br /> LCS % <br /> Recovery- 97 97 97 97 <br /> Control Limits: 80.120 80.120 80-120 80-120 <br /> MS/MSD <br /> Batch#' G3DC6401 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 3 GCHP-3 GCHP-3 GCHP-3 <br /> Matrix Spike <br /> % Recovery: 100 10o 100 100 <br /> Matrix Spike <br /> vi�}�i�%atrr% <br /> Recovery: 99 100 100 100 <br /> Relative% <br /> Difference: 10 00 00 00 <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 OC limits for MS/MSD's are advisory only <br /> / y - and are not used to accept or(elect batch results <br /> Marra Leek ) <br /> Proje"armag er 3DD9D01 BLA <3> <br />