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Sequoia 680 Chesapeake Dnve Redwood Cry CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 9:q) 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> v117 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 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 Justin Hawkins QC Sample Group 6101150-51 Reported Oct 30, 1995 <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 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# LCS102596 LCS102596 LCS102596 LCS102596 <br /> Date Prepared 10/25/96 10/25/96 10/25/96 10/25/96 <br /> Date Analyzed 10/25/96 10/25/96 10/25/96 10/25/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> 0 LCS % <br /> Recovery 93 108 95 95 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # BS102596 BS102596 BS102596 BS102596 <br /> Date Prepared 10/25/96 10/25/96 10/25/96 10/25/96 <br /> Date Analyzed 10/25/96 10/25/96 10/25/96 10/25/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 91 92 92 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 96 98 97 <br /> Relative% <br /> Difference 43 42 63 53 <br />�OUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> VA1QUk N!. WW7C—Pl I E?- preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> FOP- 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 /> 6101150 PEG <2> <br />