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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 /> 0 n w. NSA :x ha ,. 7. .r.. , .r ,.,.v .,,,.,.s,. ,. ,. ,. �,. .,-.r ,.., ,. ��. hkM1 rc i�`r-,vs•^�rr-X^r <br /> Kapreallan Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave , Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 K> <br /> ,Attention Mardo Kapreallan, P E QC Sample Group 2061093-1096 Reported Jul 7, 1992 <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 J F J F J F J F K Wiener <br /> Reporting Units erg/L ug/L Yg/L u9/L ug/L <br /> Date Analyzed Jun 25, 1992 Jun 25, 1992 Jun 25, 1992 Jun 25, 1992 Jun 29, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conic N D N D N D N D N D <br /> Spike Conc. <br /> Added. 040 040 040 12 300 <br /> Conc. Matrix <br /> Spike: 040 040 040 1 3 301 <br /> Matrix Spike <br /> %Recovery: 100 100 100 108 100 <br /> Conc Matrix <br /> Spike Dup 040 040 040 13 288 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery, 100 100 100 108 96 <br /> Relative <br /> % Difference. 00 00 00 00 44 <br /> Laboratory blank contained the following analytes None Detected <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> Scott A Chleffo (Cone of M S + Conc of M S D)/2 <br /> Project Manager 2061093 KEI <4> <br />