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ti <br /> Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364-9600 FAX (415) 364 9233 <br /> 404 N Wiget Sane Walnut (-reek. CA 94598 (510; ')88-9600 FAX (5 10) 98H 9673 <br /> Analytical 814 Striker Avenue,Suite 8 SdCratllentn,CA 95874 (91(,) ')21 'th00 FAX 1916; 'Q] 0100 <br /> *Cific- ; ,1.1' , imental Group Client Project ID: 920-078.1A/Chevron 9-0557, Stockton, CA <br /> 11315 Sunrise' Gold Circle, Ste, M Matrix: Soil <br /> Rancho GUftluV(1. CA 95742 <br /> Attention Ro(ler Hoffmore OC Sample Group 7100314-0336, 0341, 0344 Reported: Oct 24, 193T: <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X lenes <br /> Method: EPA 8020 EPA 8G20 EPA 8020 EPA 8020 <br /> Analyst: C.Lee C. Lee C. Lee C. Lee <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> LCS Batch#: LCS101697 LCS101697 LCS101697 LCS101697 <br /> Date Prepared: 10/16/97 10/16/97 10/16/97 10/16/97 <br /> Date Analyzed: 10/16/97 10/16/97 10/16/97 10/16/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS <br /> Recovery: 115 105 106 107 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch #: 7100329 7100329 7100329 7100329 <br /> Date Prepared: 10/16/97 10/16/97 10/16/97 10/16/97 <br /> Date Analyzed: 10/16/97 10/16/97 10/16/97 10/16/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> Recovery: 61 47 92 70 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 63 49 94 72 <br /> Relative % <br /> Difference: 3.2 4.2 2.2 2.8 <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 /> raC. <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 effecls,the dC limits for MS/MSD's are advisory onky <br /> Schn ider and are not used to accept or reject batch results. <br /> PrManager/Sacramento Laboraory <br /> 7100324.PES <9> <br />