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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 3649600 FAX (415) 3649233 <br /> J 404 N Wiget Lane Walnut Creek, C A 94598 (510) 988-9600 FAX (51[11 9889679 <br /> 611,1 Analytical 814 Striker Avenuc,Sulu 8 Sacramento, (.A 95834 (916} 921-9600 FAX (9161 9210100 <br /> 'Pacific Environmental Group Client Project ID: 920-078.1A/Chevron 9-0557, 139 S Center St. <br /> 11315 Sunrise Gold Circle, Ste. M Matrix: Water <br /> Rancho Cordova, CA 95742 <br /> Attention: Roger Hoff more OC Sample Group 7110051-52 Reported: Nov 11, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: S. Phillips S. Phillips S.Phillips S.Phillips <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCS111197 LCS111197 LCS111197 LCS111197 <br /> Date Prepared: 11/11/97 11/11/97 11/11/97 11/11/97 <br /> Date Analyzed: 11/11/97 11/11/97 11/11/97 11/11/97 <br /> Instrument I.D.#: GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery: 102 95 93 92 <br /> Control Limits: 70-130 70-130 70-130 70.130 <br /> MS/MSD <br /> Batch#: 7110053 7110053 7110053 7110053 <br /> Date Prepared: 11/11/97 11/11/97 11/11/97 11/11/97 <br /> Date Analyzed: 11/11/97 11/11/97 11/11/97 11/11/97 <br /> Instrument I.D.#: GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery: 102 94 92 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 96 92 90 91 <br /> Relative % <br /> Difference: 6.1 2.2 2.2 2.2 <br /> SEQUOIA ANALYTICAL Please Dote: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> /*,LJ (vJ�,�-�---� � 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 /> Linda C. Schneider and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Labora ory <br /> 7110051.PEs <a> <br />