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f . Sequoia 6a0 Crtesapeake Dnve Redwood City CA 93063 (415) 364 9600 FAX(415) 363 9233 <br /> 404 N Wiget Lane 'Walnut Creek CA 94598 (5 10) 968 9600 FAX(5 10)988 9673 <br /> fr�ll� Analytical 3t9 Striker Avenue Suite 9 Sacramento Ca 95834 (916) 921 9600 FAX(916)931 0100 <br />. Brawn & Caldwell Client Project ID Arco 02133, Stockton CA <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 7030653-72 Reported Apr 1, 1997 <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 e w e w B w B w <br /> Concentration <br /> Spiked 200 ug/L 200 ug/L 200 ug/L 600 ug/L <br /> LCS Batch# LCS032497 LCS032497 LCS032497 LCS032497 <br /> Date Prepared 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Date Analyzed 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP 2 <br /> LCS <br /> Recovery 96 e8 90 as <br /> Control Limits 70-130 70-130 70 130 70-130 <br /> MS/MSD <br /> Batch # 7030770 7030770 7030770 7030770 <br /> Date Prepared 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Date Analyzed 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 88 85 90 88 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 86 90 88 <br /> Relative % <br /> Difference 2 2 12 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 /> 05" M �DaSD preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Oue to matrix effects the QC limits for MS/MSDs are advisory only <br /> Edana M Frueiano and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory 7030653 8R <6> <br />