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ill <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988.9673 <br /> Analytical819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)92E•0100 <br /> a <br /> I <br /> Pacific Envlror�rrli?ntal­Group, Inc. Client Project ID . Arco 2083,Tracy, CA <br /> 11315 Sunrise Gold Circle, #M Matrix: Water <br /> Rancho Cordova, CA 95742 4. <br /> Attention: Greg Barclay QC Sample Group 6110672-78 Reported: Dec 3, 1996 <br /> Ij <br /> QUALITY CONTROL DATA REPORT <br /> li <br /> II <br /> I it I <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene 4 Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: B.Williams B.Williams B.Williams :! B.Williams f <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L '.ii 30 ug/L <br /> LCS Batch#: LCS 112696 LCS112696 LCS112696 ii LCS112696 <br /> I <br /> Date Prepared: 11/26/96 11/26/96 11/26/96 11/26/96 <br /> Date Analyzed: 11/26/96 11/26/96 11/26/96 it 11/26/96 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 j GCHP-2 <br /> LCS % <br /> Recovery: 99 103 102 F 102 <br /> �l <br /> Control Limits: 70-130 70-130 70-130 70.130 <br /> �l I <br /> ........ ........ . _.. .......... <br /> MS/MSD 0 <br /> i Batch #: 6110749 6110749 6110749 6110749 <br /> :c <br /> Date Prepared: 11/26/96 11/26/96 11/26/96 11/26/96 <br /> Date Analyzed: 11/26/96 11/26/96 11/26/96 Ij 11/26/96 �11 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP 2 1 <br /> Matrix Spike <br /> Recovery: 98 100 too 101 <br /> i, <br /> t Matrix Spike <br /> Duplicate % <br /> Recovery: 102 105 104 I: 103 <br /> Relative % <br /> Difference: 4.0 4.9 3.9 2.0 <br /> .i <br /> i <br /> SEQUOIA ANALYTICAL Please Note: Ij <br /> �.. The LCS is a control sample of known,'interferent free matrix that is analyzed using the same reagents, <br /> t <br /> preparation and analytical methods em fo ed for the samples. The LCS%recovery data is used for <br /> /���� P P Yt f P Y P rY <br /> L � � validation of sample batch results. Due to matrix effects,the QC limits for.MS/M1ASO's are advisory only <br /> Linda C. Schneider and are not used to accept or reject bench results. <br /> Project Manager/Sacramento Lahore ory <br /> 6110672.PES <6> <br />