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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (4t5) 364 9233 <br /> 1900 Bates Avenut Suite L Concord CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> *.w.-.-t, Inc Client Project 1D Shell, 141 N EI Dorado, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matra Air <br /> Roseville, CA 95678 <br /> Attention Paul Graff QC Sample Group 4060084-86 Reported Jun 7, 1994 <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 Chiaravalloti Chiaravalloti Chiaravalloti Chiaravallotl <br /> Concentration <br /> Spiked 2 0 mg/mz 2 0 mg/m3 2 0 mg/m' 6 0 mg/m3 <br /> LCS Batch# BLK060394 BLK060394 BLK060394 BLK060394 <br /> Date Prepared 6/3/94 6/3/94 6/3/94 6/3/94 <br /> Date Analyzed: 6/3/94 6/3/94 6/3/94 6/3/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> 40 Recovery 110 105 105 107 <br /> Control Limas 75-125 75-125 75 125 75-125 <br /> MS/MSD <br /> Batch # BLK060394 BLK060394 BLK080394 BLK060394 <br /> Date Prepared 6/3/94 6/3/94 6/3/94 6/3/94 <br /> Date Analyzed 6/3/94 6/3/94 6/3/94 6/3/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery 110 105 105 107 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 95 100 95 <br /> Relative % <br /> Difference 95 10 49 12 <br /> OlA ANALYTICAL Piease Note <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 /> 1011.1 <br /> da C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 4060084 FUG <3> <br />