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Y • Sequoia 680 Chesapeake Drive Redwood Cary CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 1900 Bates Avenue Suite L Concord CA 94520 X510) 686 9600 FAX(510)686 9689 <br /> B 19 strike,Avenue SUlte 8 Sacramento CA 95834 x916) 921 9600 FAX{916)921 0104 <br /> *Brown & Caldwell Client Project ID Arco 434-94-5 Lodi <br /> 9616 Micron Avenue Suite 600 Matrix Air <br /> Sacramento, CA 95827 <br /> Attention Mindy Wright OC Sample Group 4070247, 254, 257 Reported Jul 19 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 J Minkel J Minkel J Minkel J Minkel <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# N/A N/A N/A N/A <br /> Date Prepared N/A N/A N/A N/A <br /> Date Analyzed N/A N/A N/A N/A <br /> Instrument I D # N/A N/A N/A N/A <br /> LCS <br /> Recovery N/A N/A N/A N/A <br /> Control Limits 71-133 72-128 72130 71-120 <br /> MS/MSD <br /> Batch # 9407066-01 C 9407066-01 C 9407066-01 C 9407066-01 C <br /> Date Prepared: N/A N/A N/A N/A <br /> Date Analyzed 7/7/94 7/7/94 7/7/94 7/7/94 <br /> Instrument I D # GCHP-03 GCHP-03 GCHP-03 GCHP-03 <br /> Matrix Spike <br /> % Recovery- 100 100 100 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 96 96 96 97 <br /> Relative % <br /> Difference 41 41 41 60 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> GA.L preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> iV\ validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> Craig C Lee and are not used to accept or reject batch results <br /> Project Manager <br /> 4070247 SFIS <5> <br />