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.l <br /> Sequoia 680 Chesapeake Drive Redwood Gty CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek C4 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 92t 9600 FAX(916)921 0100 <br /> EMCON Client Project ID ARCO 2130 Stockton, CA <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Deanna Santos OC Sampie Group 7111285-1292 Reported Dec 10 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes MTBE <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6260 <br /> Analyst- S Phillips S Phillips S Phillips S Phillips R Y/L Z <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 50 ug/L <br /> LCS Batch# LCS120297 LCS120297 LCS120297 LCS120297 LCS120297 <br /> Date Prepared 12/02/97 12/02/97 12/02/97 12/02/97 12/02/97 <br /> Date Analyzed 12/02/97 12/02/97 12/02/97 12/02/97 12/02/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP-2 F3 <br /> LCS <br /> Recovery- 104 98 94 90 94 <br /> Control Limits 70-130 70 130 70-130 70-130 70 130 <br /> MS/MSD <br /> Batch # 7111287 7111287 7111287 7111287 9711F37-10 <br /> Date Prepared 12/02/97 12/02/97 12/02/97 12/02/97 12/01/97 <br /> Date Analyzed 12/02/97 12/02/97 12/02/97 12/02/97 12/01/97 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP-2 GCHP 2 F3 <br /> Matrix Spike <br /> % Recovery 99 91 95 87 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 106 98 101 93 102 <br /> Relative% <br /> Difference 68 74 61 67 40 <br /> SEQOlA ANALYTI AL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> /�/J� ���� preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> tLL�� validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> 'Lirn/dra/C Schneider and are not used to accept or reject batch results <br /> Polect Manager/Sacramento LalJora ory <br /> 7111285 EMC <7> <br />