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Sequoia T 680 Ch.peake Drive Redwood City,CA 94063 (650) 364.9600 FAX(650)364-9133 <br /> 404 N.Wiget lane Walnut Geek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 911-9600 FAX(916)911-0100 <br /> Pacific Environmental Group Client Project ID: Unocal, Lathrop, CA <br /> 11315 Sunrise Gold Circle, Ste. M Matrix: Soil <br /> Rancho Cordova, CA 95742 <br /> Attention: Rusty Benkosky QC Sample Group 7110397-0402 Reported: Dec 3, 19971€ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead MTBE <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010A EPA 8260 <br /> Analyst: C.Lee C.Lee C.Lee C.Lee D.Knab L Zhu <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg 50 mg/kg 2,500 Ng/kg <br /> LCS Batch#: LCS111997 LCS111997 LCS111997 LCS111997 LCS120197 LCS112197 <br /> Date Prepared: 11/19/97 11/19/97 11/19/97 11/19/97 12/01/97 11/19/97 <br /> Date Analyzed: 11/19/97 11/19/97 11/19/97 11/19/97 12/03/97 11/21/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 ICP-1 F2 <br /> LCS % <br /> Recovery: 115 103 103 103 96 108 <br /> Control Limits: 70-130 70-130 70130 70-130 80-120 70-130 <br /> MS/MSD <br /> Batch#: 7110839 7110839 7110839 7110839 7110402 9711 B72-02 <br /> Date Prepared: 11/19/97 11/19/97 11/19/97 11/19/97 12/01/97 11/21/97 <br /> Date Analyzed: 11/19/97 11/19/97 11/19/97 11/19/97 12/03/97 11/23/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 ICP-1 F2 <br /> Matrix Spike <br /> % Recovery: 114 102 102 102 99 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 115 103 103 103 95 96 <br /> Relative% <br /> Difference: 0.87 0.98 0.98 0.98 4.1 0.0 <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 /> -_ C_/�� tdraTory <br /> preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> validation of sample batch results. Due tc matrix effects,the QC limits for MS/MSD's are advisory only <br /> n�a C. Schn I erand are not used to acceptor reject batch results. <br /> roject Mnager/Sacrament <br /> 7110397.PES ,10 <br />