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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord, California 94520 <br /> (510) 686-9600 - FAX (510) 686-9689 <br /> `�'� 1 �:tri r✓Fi".or ryx�':5^° ,. ,.. ... .r v t} . o : ^ kw,nn>s. <br /> Kaprealian Engineering, Inc Client ProiecflD Unocal Bulk Plant#0950, Stockton A <br /> 12401 Stanwell Drive, Surte 400 <br /> 'Concord, CA 94520 w <br /> Attention Mardo Kaprealian, P E QC.Sample Group 2100024-26 Reported Oct 6, 1992 <br /> .wr �< . ,.`2. `ol.^`^` h• ''v',. '.. ` ` '' ,f .., : r k r ,. o` k.:,t` x,'', s r v A .: 'z�� ` �A,v�,. , i<ki;� .}}�x^-+,°�x� A � <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Arsenic Banum Cadmium Chromium Cobalt Copper Lead <br /> Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst V Owens V Owens V Owens V Owens V Owens V Covens V Owens <br /> Reporting Unds mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Oct 5, 1992 Oct 5, 1992 Oct 5, 1992 Oct 5, 1992 Oct 5, 1992 Oct 5, 1992 Oct 5, 1992 <br /> 00 Sample# 209-3339 209-03M 209-18 20943348 209-3348 209.0339 209-0347 <br /> Sample Conc. 33 50 073 97 38 170 21 <br /> Spike Conc. <br /> Added 50 50 50 50 50 50 125 <br /> Conc. Matrix <br /> Spike: 55 105 51 140 54 220 135 <br /> Matrix Spike <br /> %Recovery: 103 110 100 86 100 100 91 <br /> Conc. Matrix <br /> Spike Dup.: 55 101 51 140 53 220 130 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 103 102 100 86 98 100 87 <br /> Relative <br /> % Difference. 00 39 00 00 19 00 38 <br /> Laboratory Blank contained the following analytes done detected <br /> SEQUOIA CAL 96 Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> $colt A Chieffo (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2100024 KEI <7> <br />