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a ' Sequoia 680 Che;lP-ai.e Dnv- Redwood City CA 94063 4151 364 9600 FAX (415) 364 9233 <br /> j^f� 404 N u 1Vet Lane Vlalnut Creel. CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> �aI17 Analytical 819 Sinker Ave nuc Suite 5 Sacramento CA 95834 1916) 921 9600 FAX f9,6) 92, 0100 <br /> . Pacific Environmental Group, Inc Client Project ID Unocal #2859, Stockton, CA <br /> 2025 Gateway Place, Suite 440 Matrix Air <br /> San Jose, CA 95110 <br /> Attention Rhonda DeJung QC Sample Group 6090228-29 Reported Sep 12, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 6020 EPA 8020 EPA 8020 <br /> Analyst B Williams B Williams B Williams B Williams <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LOS090996 LCS090996 LCS090996 LCS090996 <br /> Date Prepared 09/09/96 09/09/96 o9/09/96 09/09/96 <br /> Date Analyzed 09/09/96 09/09/96 09/09/96 09/09/96 <br /> Instrument 1 D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 113 112 112 112 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch# BS090996 13SD90996 BS090996 BS090996 <br /> Date Prepared. 09/09/96 09/09/96 09/09/96 09/09/96 <br /> Date Analyzed 09/09/96 09/09/96 09/09/96 09/09/96 <br /> Instrument I D #- GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 110 108 107 104 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 108 108 106 104 <br /> Relative % <br /> Difference 1 8 00 094 0 0 <br /> SEQUOIA ANALYTICAL Please mote <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/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 /> 6090228 PEG <,2> <br />