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smog <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N.Wilict Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988.9673 <br /> (D 119 5trikcr Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> mqQf Analytical <br /> .......... <br /> Pacific Envirorimpntal Group ClientProle6t 10: Unocal CA <br /> 11315 Sunrise Gold Circle, Ste. M Matrix: Soil <br /> Rancho Cordova, CA 95742 <br /> 1 Attention: Rusty Benkosky OC Sample Group 7111174-1176 Reported: Dec 2, 1199711, <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA6010A <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#: LCS 112697 LCS112697 LCS1 12697 LCS1 12697 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 /> MENEM, <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 I.D.#: 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 39 3.8 63 <br /> SEQUOIA ANALYTI AL Please Note <br /> Q <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/MSDs are advisory only <br /> i nda <br /> C. Sch eider and are not used to accept or reject batch results. <br /> Project M <br /> Manager/Sacramento LaboraTory <br /> 7111174 PES .3'- <br /> I 10� <br />