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Sequoia680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94596 (5 t0) 988 9600 FAX(510)988 9673 <br /> SII Analytical 819 Senker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(9t6)921 otoo <br /> Pacific.Environmental Group, Inc Client Rrolect ID Arco 5450, Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> " Rancho Cordova, CA 95742 <br /> Attention Greg Barclay QC Sample Group 6110670-71 Reported Dec 3, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X lenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst B Williams B Williams B Williams B Williams <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS112596 LCS112596 LCS112596 LCS112596 <br /> Date Prepared 11/25/96 11/25/96 11/25/96 11/25/96 <br /> Date Analyzed 11/25/96 11/25/96 11/25/96 11/25/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> • LCS % <br /> Recovery 103 107 106 106 <br /> Control Limits 70-130 70.130 70.130 70-130 <br /> MS/MSD <br /> Batch # 6110778 6110778 6110778 6110778 <br /> Date Prepared 11/25/96 11/25/96 11/25/96 11/25/96 <br /> Date Analyzed 11/25/96 11/25/96 11/25/96 11/25/96 <br /> Instrument I D #. GCHP-1 GCHP 1 GCHP 1 GCHP i <br /> Matrix Spike <br /> % Recovery 100 103 105 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 98 102 103 103 <br /> Relative % <br /> Difference 20 098 19 00 <br /> SEQUOIA ANALYTICAL Please(vote <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 /> l���� /// GC validation of sample batch results Due to matrix effects the QC limits for MS/MSD s are advisory only <br /> tnda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6110670 PES <3> <br />