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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM • Concord,California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Waterwork(Escalon Offices A Cifent Project ID #322-JB Terminal <br /> 1710 Main Street <br /> Escalon,CA 95320 <br /> Attention Nora Kataoka OC Sample Group 1100523-526 Reported Oct 23, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzena Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/800 8015/8020 8015/8020 <br /> Analyst H.H/J F R H/J F R H/J F R H/J r <br /> Reporting Units ug/L ug/L ug/L ug/L <br /> Date Analyzed Oat 21, 1991 Oct 21, 1991 Oct 21, 1991 Oct 21, 1991 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc: N D N D N D N D <br /> Splice Conc. <br /> Added' 20 20 20 60 <br /> Conc Matrix <br /> Spike: 23 22 23 72 <br /> Matrix Spike <br /> %Recovery. 115 110 115 120 <br /> Conc Matrix <br /> Spike Dup . 22 22 23 71 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 110 110 115 118 <br /> Relative <br /> %Difference. 44 0 0 14 <br /> Laboratory blank contained the following analytes None Detected <br /> SEQUOIA ANALYTICAL %flemVery cone of M S Conc of Sample x 10o <br /> 11 Spike Conc Added <br /> Stlobve%Difference Conc of M S -Conc of M S D x 100 <br /> JU a R Malerstein (Conc of MS t Conc of M S D) 2 <br /> Pr act Manager <br /> 1100523 WAT <2> <br />