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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N.Wiget lane Walnut Creek,CA 94598 (510) 988.9600 FAX(510)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921-0100 <br /> Analytical <br /> Pacific Environmental Group Client Project ID: Unocal #1205, Lathrop, CA <br /> 11315 Sunrise Gold Circle, Ste. M Matrix: Water <br /> Rancho Cordova, CA 95742 <br /> Attention: Rusty Benkosky QC Sample Group: 711-1173 Reported: Dec 3, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Mercury Arsenic Cadmium Chromium Nickel Zinc <br /> Method: EPA 245.1 EPA 200.7 EPA 200.7 EPA 200.7 EPA 200.7 EPA 200.7 <br /> Analyst: P.Kent D.Knab D.Knab D.Knab D.Knab D.Knab <br /> Concentration <br /> Spiked: 0.0050 mg/L 0.50 mg/L 0.50 mg/L 0.50 mg/L 0.50 mg/L 0.50 mg/L <br /> LCS Batch#: LCS112497 LCS712097 LCS112097 LCS112097 LCS112097 LCS112097 <br /> Date Prepared: 11/24/97 11/20/97 11/20/97 11/20/97 11/20/97 11/20/97 <br /> Date Analyzed: 11/24/97 11/24/97 11/24/97 11/24/97 11/24/97 11/24/97 <br /> Instrument I.D.#: HG-1 ICP-1 ICP-1 ICP-1 ICP-1 ICP-1 <br /> LCS % <br /> Recovery: 100 103 100 103 102 103 <br /> Control Limits: 80-120 80-120 80-120 80-120 e0-120 80-120 <br /> MS/MSD <br /> Batch#: 7111173 7111118 7111118 7111118 7111118 7111118 <br /> Date Prepared: 11/24/97 11/20/97 11/20/97 11/20/97 11/20/97 11/20/97 <br /> Date Analyzed: 11/24/97 11/24/97 11/24/97 11/24/97 11/24/97 11/24/97 <br /> Instrument I.D.#: HG-1 ICP-1 ICP-1 ICP-i ICP-1 ICP-1 <br /> Matrix Spike <br /> %Recovery: 101 93 93 90 87 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 96 95 93 89 95 <br /> Relative % <br /> Difference: 1.0 3.2 2.1 3.3 2.3 2.1 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTI AL 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 OC limits for MS/MSD's are advisory only <br /> � �� /��� and are not used to accept or reject batch results. <br /> I a C. Schneider <br /> Project Manager/Sacramento Laboratory <br /> j 7111173.PES <7- <br /> R� <br />