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Sequoia 680 Chesapeake Dnvc Red-ood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> KD) 404 N W,get Lane Walnut Crack CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 1,IF Analytical 819 Sinker Avenuc Susie 8 Sacramento CA 95934 (916) 921 9600 FAX(916)921 0100 <br /> Grown & Caldwell Client Project ID ARCO 02133, Stockton, CA <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 7111534-1543 Reported Dec 12, 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 C L/S P C L/S P C L/S P C L/S P M Williams <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 50 ug/L <br /> LCS Batch# LCS120497 LCS120497 LCS120497 LCS120497 LCS120997 <br /> Date prepared 12/04/97 12/04/97 12/04/97 12/04/97 12/09/97 <br /> Date Analyzed 12/04/97 12/04/97 12/04/97 12/04/97 12/09/97 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 F3 <br /> LCS % � <br /> Recovery 106 99 98 97 72 <br /> Control Limits 70 130 701,30 70 130 70 130 70-130 <br /> MS/MSD <br /> Batch # 7111534 7111534 7111534 7111534 971235012 <br /> Date prepared 12/04/97 12/04/97 12/04/97 12/04/97 12/09/97 <br /> Date Analyzed 12/04/97 12/04/97 12/04/97 12/04/97 12/09/97 <br /> Instrument I D # GGHP-1 GCHP-1 GCHP 1 GCHP-1 F'3 <br /> Matrix Spike <br /> % Recovery 110 101 100 99 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 106 96 97 96 96 <br /> Relative % <br /> Difference 37 51 30 31 65 <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 /> preparation and analytical methods employed for the samples The LCS%recovery data Is used for <br /> C validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> inda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labora ory <br /> 7111534 8 R S <7> <br />