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T) <br /> Sequoia 680 Chesapeake Drive Redwood Ctty CA 94063 (415) 364 9600 FAX(411 5} 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 1%W Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> *Pacific 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 6991247--67 Reported Oct 11 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 S Williams B Williams B Williams <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#• LCS100396 LCS100396 LCS100396 LCS100396 <br /> Date Prepared 10/03/96 10/03/96 10/03/96 10/03/96 <br /> Date Analyzed 10/03/96 10/03/96 10/03/96 10/03/96 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP-2 GCHP 2 <br /> LCS % <br /> Recovery 102 104 106 108 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 6100015 6100015 6100015 6100015 <br /> Date Prepared 10/03/96 10/03/96 10/03/96 10/03/96 <br /> Date Analyzed 10/03/96 18/03/96 10/03/96 10/03/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 98 98 99 99 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 103 104 104 104 <br /> Relative % <br /> Difference 5 0 59 49 49 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s 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 1s used for <br /> validation of sample batch results Due to matrix effects the QC 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 <9> <br />