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Sequoia 680 Chesapeake Dnve Redwood Oty CA 94063 (650) 364 9600 FAX(650)364 9333 <br /> 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 %00 FAX(St0) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Grown & Caldwell Client Project ID ARCO 02133 Stock-ton 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 <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst S Phillips S Phlfhps S Phillips S Phillips <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS120597 LCS120597 LCS120597 LCS120597 <br /> Date Prepared 12/05/97 12/05/97 12/05/97 12/05/97 <br /> Date Analyzed 12/05/97 12/05/97 12/05/97 12/05/97 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> LCS <br /> Recovery 107 100 97 97 <br /> Control Limits 70-130 70 130 70-130 70 130 <br /> MS/MSD <br /> Batch,f# 7120029 7120029 7120029 7120029 <br /> Date Prepared 12/05/97 12/05/97 12/05/97 12/05/97 <br /> Date Analyzed 12/05/97 12/05/97 12/05/97 12/05/97 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 109 101 98 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 99 94 94 91 <br /> Relative % <br /> Difference 96 72 42 74 <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 anaiyucal methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects the CC limits for MS/MSD s are advisory only <br /> inda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labora Fory <br /> 7111534 BRS <8> <br />