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i <br /> .� Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364.9600 FAX(415) 364-9233 <br /> 404 N- W;get Lane Walnut Crerk,CA 94598 (510) 988-9600 FAX(510)988.9673 <br /> Analytical 819 Striker Avenue,Suitc 8 Sacramento, CA 95834 (916) 921.9600 FAX(916)921.0100 <br /> f <br /> Pacfic Environments! Group, Inc. Client Project ID: Arco 2093,Tracy,CA <br /> 11315 Sunrise Gold Circle, #M Matrix: Water <br /> Rancho Cordova, CA 95742 <br /> Attention Greg Barclay QC Sample Group 6020578-0594 Reported: Feb 21, 1996:: <br /> � f <br /> fi <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> ' Benzene Toluene Benzene Xylenes <br /> t <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C.Chapman C.Chapman C.Chapman C.Chapman <br /> Concentration .. <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> r <br /> LCS Batch#: LCS021796 LCS021796 LCS021796 '.LCS021796 <br /> i <br /> Date Prepared: 02/17/96 02/17/96 02/17/96 02/17/96 <br /> Date Analyzed: 02/17/96 02/17/96 02/17/96 02/17/96 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 I' GCHP-2 <br /> i; <br /> LCS % <br /> Recovery: 90 90 96 95 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch#: BS021796 BS021796 BS021796 BS021796 <br /> Date Prepared: 02/17/96 02/17/96 02/17/96 -;02/17/96 <br /> Date Analyzed: 02/17/96 02/17/96 02/17/96 ''02%17/96 <br /> Instrument,I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> %Recovery: 88 89 90 89 <br /> Matrix Spike <br /> I Duplicate% <br /> Recovery: 95 96 96 97 <br /> Relative % <br /> Difference: 7.6 7.6 6.4 9.6 <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 /> J f preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> validation of sample batch results. Due tt'matrix effects,the QC limits for MS MSD's are advisory only <br /> Janet an and are not used to accept or reject batch results. <br /> Project anager/Sacramento Labors ary , <br /> 6020578.PES <5> <br /> ' _ t <br />