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Sequoia 680 Chesapeake Drive Redwood City.CA 94063 (415) 364-9600 FAX(415) 364.9233 <br /> •1 i}�' 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(5 t0)968.9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9500 FAX(916)921.0100 <br /> "5"P acific I`riviranmental"Gr.6 Eric. Cfient Project 1D: Arco 4,Lodf, C <br /> 11315 Sunrise Gold Circle, #M Matrix: Water <br /> Rancho Cordova, CA 95742 <br /> >'Attention: GregBarclayQC Sample Group 6111191-96 Reports ec 11, 1996:;; <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: B.Williams B.Williams B.Williams B.Williams <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCS120396 LCS120396 LCS120396 LCS120396 <br /> Date Prepared: 12/03/96 12/03/96 12/03/96 12/03/96 <br /> Date Analyzed: 12/03/96 12/03/96 12/03/96 12/03/96 <br /> Instrument l.D.#: GCHP-1 GCHP-1 GCHP•1 GCHP-1 <br /> • LCS % <br /> Recovery: 100 103 104 108 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch#: 6111073 6111073 6111073 6111073 <br /> Date Prepared: 12/03/96 12/03/96 12/03/96 12/03/96 <br /> Date Analyzed: 12/03/96 12/03/96 12/03/96 12/03/96 <br /> Instrument I.Q.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery: 95 99 98 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 96 98 102 101 <br /> Relative% <br /> Difference: 1.0 1.o 4.0 0.0 <br /> . SEQUOIA ANALYTICAL PleaseNote: <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 QC limits for MS/MSD's are advisory only <br /> Linda C. Schneider and are not used to accept or reject batch results. <br /> / ' <br /> Project Manager/Sacramento Labors ory <br /> 6111191.PES <3> <br />