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Ci�4 NT �1Sequoia 6W Chcc3P:akc Drne Pcawood C'(N Cr, (1,063 � 15 364 9.,,r> fA) 455 364 9'-33 <br /> 404 ri&ct Lan: alnut Crcei, CA 9.598 'D101 988 9600 i~� (510) 968 9G73 <br /> 1%0 Analytical 819 StTtkrr Avenuc Suitc 8 Sacramcnto CA 95834 (916) 9?; 9600 '-AX (9;6) 921 0100 <br /> Pacific Environmental Group, Inc Client Project ID Unocal 2869, Stockton, CA <br /> 2026 Gateway Place, Suite 440 Matrix Air <br /> San Jose, CA 9611 o <br /> Attention Rhonda DeJung QC Sample Group 6081166-67 Reported Sep 4, 1996 <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 B Williams B Williams B Williams $ Williams <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 8 0 mg/m3 <br /> LCS Batch# LCS082996 LCS082996 LCS082996 LCS082996 <br /> Date Prepared 08/29/98 08/29/95 08/29/96 08/29/96 <br /> Date Analyzed 08/29/96 08/29/96 08/29/96 06/29/96 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 107 107 106 108 <br /> Control Limits 70.130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # BS032996 BS082996 BSD82996 BS082996 <br /> Date Prepared 08/29/96 08/29/96 08/29/96 08/29/96 <br /> Date Analyzed 08/29/96 08/29/96 08/29/96 08/29/96 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 107 107 106 108 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 112 112 112 112 <br /> Relative% <br /> Difference 45 45 55 36 <br /> SEQUOIA ANALYTI AL Please Note <br /> 1prndThe 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 /> L / CCC J [ validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory onlY <br /> C Schneider and are not used to accept or reject batch results <br /> a <br /> oject Manager/Sacramento Laboratory <br /> 6081166 PEG <2> <br />