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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> rr�,�r',`447r,, a:r <br /> ERM-West Client Project 1D^#15701/Catejlus-Stockton <br /> 777 Botelho Dr, Suite 260 <br /> Walnut Creek, CA 94596 y <br /> Attention Bruce Pfasf QC Sample Group 2090034-43 Reported Sep 16, 1992 <br /> r z� <br /> r n{"n nrivvY h.FF}AG Ofi�" 4 44C1Abik0^A4v O O Y r. 4 r ry . {O'r v r rvr, ry p`rb 4X,h4 r• r r }ri n-vA $+4»r 4 L3q{}m n,~rvhv 4 k r 4 v <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 EPAS015 <br /> Analyst AP AP AP AP KWmer <br /> Reporting Units ug/L pg/L ug/L ug/L pg/L <br /> Date Analyzed Sep 8, 1992 Sep 8, 1992 Sep 8, 1992 Sep 8, 1992 Sep 15, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone.: N D N D N D N D N D <br /> Spike Cone. <br /> Added: 20 20 20 60 300 <br /> Cone Matrix <br /> Spike: 21 21 21 fib 333 <br /> Matrix Spike <br /> %Recovery: 105 105 105 113 111 <br /> Cone.Matrix <br /> Spike Dup.: 22 22 22 69 290 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 110 110 110 115 97 <br /> Relative <br /> %Difference 4 7 4 7 4 7 1 5 14 <br /> *SEOUOIA ANALYTICAL %Reoovery Conc of M S -Conc of Sample x too <br /> Spike Conc Added <br /> trve%Difference Conc of M S -Conc of M S D x 100 <br /> Kenneth K F Lee (Cont of M S + Cone of M D)/2 <br /> Laboratory Director 20900M ERM aa> <br />