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/ \ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 989 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> acoic 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 OC Sample Group 6091247-67 Reported Oct 11, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst B Williams B Williams 6 Williams B Williams <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS100896 LCS100896 LCS100896 LCS10o896 <br /> Date Prepared 10/08/96 10/08/96 10/08/96 10/08/96 <br /> Date Analyzed 10/08/96 10/08/96 10/08/96 10/08/96 <br /> Instrument 10 # GCHP-7 GCHP 7 GCHP-7 GCHP 7 <br /> LCS % <br /> Recovery 97 100 101 103 <br /> Control Limits 70-130 70-130 70-130 70.130 <br /> MS/MSD <br /> Batch # 6091296 6091296 6091296 6091296 <br /> Date Prepared 10/08/96 10/08/96 10/06/96 10/08/96 <br /> Date Analyzed 10/08/96 10/08/96 10/08/96 10/08/96 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 68 79 85 91 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 74 90 94 98 <br /> Relative % <br /> Difference 84 13 10 74 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known interferent free matrix that 1s analyzed using the same reagents <br /> 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 QC limits for MS/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6091247 PES <11> <br />