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Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> 1IW Analytical 819 Sinker Avenue Suice 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> lePacific Environmental Group, Inc Client Project ID Arco 2133, Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Greg Barclay QC Sample Group 6091247-67 Reported Oct 11, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> 7ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <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# LCS100496 LCS100496 LCS100496 LCS100496 <br /> Date Prepares! 10/04/96 10/04/96 10/04/96 10/04/96 <br /> Date Analyzed 10/04/96 10/04/96 10/04/96 10/04/96 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP 2 GCHP-2 <br /> LCS <br /> Recovery 108 106 105 102 <br /> Control Limits 70-130 70.130 70-130 70.130 <br /> MS/MSD <br /> Batch # 6091255 6091255 6091255 6091255 <br /> Date Prepared 10/04/96 10/04/96 10/04/96 10/04/96 _ <br /> Date Analyzed 10/04/96 10/04/96 10/04/96 10/04/96 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP 2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 102 100 100 98 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 105 105 102 100 <br /> Relative% <br /> Difference 29 4 9 2 0 20 <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 /> gel preparation and analytical 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/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 6091247 PES <10> <br />