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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 - FAX (415) 364-9233 <br /> fRESNA <br /> Client Project ID 5400606, Coca ColaStockton <br /> 1710 Main Street Matrix Liquid < <br /> Escalon, CA 95320 <br /> Attention Jeanne Homsey QC Sample Group 3GB2301 Reported Jul 26, 1993 ; <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> ' Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: A Miraftab A.Miraftab A Miraftab A Miraftab <br /> Conc Spiked: 10 10 10 30 <br /> Units yg/L ug/L pig/L ug/L <br /> LCS Batch#. BLK072493 BLK072493 BLK072493 BLK072493 <br /> Date Prepared: _ _ <br /> Date Analyzed 7/24/93 7/24/93 7/24/93 7/24/93 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery. 100 100 100 100 <br /> Control Limits: 80-120 80-120 80-120 80-12D <br /> n <br /> U MS/MSD{J�. <br /> Batch#: 3GA7901 3GA7901 3GA7901 3GA7901 <br /> ' Date Prepared: <br /> Date Analyzed: 7/24/93 7/24/93 7/24/93 7/24/93 <br /> Instrument I D.#: GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> ' Matrix Spike <br /> %Recovery. 96 95 95 93 <br /> L Matrix Spike <br /> Duplicate% <br /> Recovery, 90 90 90 90 <br /> ' Relative% <br /> Difference: 65 54 54 33 <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 /> 111 �R" validation of sample batch results Due to matrix effects,the QC limits for MS/MSUs are advisory only <br /> U and are not used to accept or refect batch results <br /> Vickie Tague <br /> Project Manager 3GS2301 WAT <2> <br />