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Sequoia680 Chesapeake Drive Redwood Ctty,CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Pnvironmental Group, Inc Client Project ID Unocal 2859, Stockton, CA <br /> 2025 Gateway Place, Suite 440 Matrix Air <br /> San Jose, CA 95110 <br /> Attention Jessica Nelligan ©C Sample Group 6110276-77 Reported Nov 15, 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 S Phillips S Phillips S Phillips S Phillips <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS110896 LCS110896 LCS110696 LCS110896 <br /> i <br /> Date Prepared 11/08/96 11/08/96 11/08/96 11/08/96 <br /> Date Analyzed 11/08/96 11/08/96 11/08/96 11/08/96 <br /> Instrument 1 D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> . LCS % <br /> Recovery 85 89 89 96 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch# BS110896 BS110896 BS110896 BS110896 <br /> Date Prepared 11/08/96 11/08/96 11/08/96 11/08/96 <br /> Date Analyzed 11/08/96 11/08/96 11/08/96 11/08/96 <br /> Instrument 1.11) # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 85 89 89 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 94 98 98 105 <br /> Relative% <br /> Difference 10 9 6 96 9 0 <br /> EQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> �� /1 L �C,�r� preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> lC 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 Labara ary <br /> 6110276 PEG <2> <br />