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�. <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 9406'3 (650) 364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical 81.9 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)931-0100 <br /> Pacific Environmental Group Client Project ID. Unocal #1205, Lathrop, CA <br /> 11315 Sunrise Gold Circle, Ste. M Matrix: Soil <br /> Rancho Cordova, CA 95742 <br /> Attention: Rusty Benkosky QC Sample Group 7111174-1176 Reported: Dec 2, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010A <br /> Analyst: Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti D.K. <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg 50 mg/kg <br /> LCS Batch#: LCS112697 LCS112697 LCS112697 LCS112697 LCS112597 <br /> Date Prepared: 11/26/97 11/26/97 11/26/97 11/26/97 11/25/97 <br /> Date Analyzed: 11/26/97 11/26/97 11/26/97 11/26/97 11/26/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 ICP-1 <br /> LCS % <br /> Recovery: 104 98 98 98 101 <br /> Control Limits: 70-130 70-130 70-130 70-130 80.120 <br /> MS/MSD <br /> Batch #: 7111192 7111192 7111192 7111192 7110837 <br /> Date Prepared: 11/26/97 11/26/97 11/26/97 11/26/97 11/25/97 <br /> Date Analyzed: 11/26/97 11/26/97 11/26/97 11/26/97 11/26/97 <br /> Instrument LD.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 ICP-1 <br /> Matrix Spike <br /> % Recovery: 77 75 76 77 55 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 81 78 79 80 106 <br /> Relative% <br /> Difference: 5.1 3.9 3.9 3.8 63 <br /> SEQUOIA ANALYTI AL Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> ��`��l 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 DC limits for MS/MSD's are advisory only <br /> lnda C. SCh eider and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Labora ory <br /> 7111174.PES <3> <br />