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r ■ Sequoia 680 Chesapeake Urivc Redwood City, CA 94063 (415) 364-9600 FAX (415) 3649233 <br /> 404N W190 Lane Walnut C reek. CA 94598 (.510) 998-9600 FAX l s jw 988 9673 <br /> Analytical 8t9 Stnkcr Avenue,Suite 8 5acrarncnto, Cal 95934 (916) 971-9600 FAX .916) 911 0100 <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 95712 <br /> Attention: Roger Hoffmore QC 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#: LCS110697 LCS110697 LCS110697 LCS110697 <br /> Date Prepared: 11/06/97 11/06/97 11/06/97 11/06/97 <br /> Date Analyzed: 11/06/97 11/06/97 11/06/97 11/06/97 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 104 98 95 95 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch #: 7110040 7110040 7110040 7110040 <br /> Date Prepared: 11/06/97 11/06/97 11/06/97 11/06/97 <br /> Date Analyzed: 11/06/97 11/06/97 11/06/97 11/06/97 <br /> Instrument I.D.#: GGHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> %Recovery: 101 96 93 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 101 96 92 92 <br /> Relative % <br /> Difference: 0.0 0.0 1.1 1.1 <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 /> It—f CL���—�Oe 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/MSD's are advisory only <br /> Linda C. Schneider and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Labors ory <br /> 7110051 PES <3> <br /> t� <br />