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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM e Concord, California 94520 <br /> (510) 686-9600 e FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave, Stockton <br /> 2401 Stanwell Drnre, Suite 400 Method EPA 8270 Q C Sample Dates <br /> Concord, CA 94520 Analyst(s) Son Le Extracted Jan 11, 1993 <br /> Attention Mardo Kapreallan, P E QC Sample# Matrix Blank Analyzed Jan 13, 1993 <br /> Reported Jan 14, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Conc Matrix Spike <br /> Conc. Spike Matrix Duplicate Relative <br /> Sample Spike Conc. Matrix % Spike % % <br /> Analyte Conc. Added Spike Recovery Duplicate Recovery Difference <br /> Phenol N D 100 55 55 60 60 87 <br /> 2-Chlorophenol N D 100 38 38 38 38 00 <br /> 1,4-Dichloro- N D 50 33 66 33 66 00 <br /> benzene <br /> ,N-Nitroso-Di-N- N D 50 37 74 38 76 27 <br /> propylamine <br /> 1,2,4-Trichloro- N D 50 33 66 32 64 31 <br /> benzene <br /> 4-Chloro- N D 100 68 68 68 68 00 <br /> 3-Methylphenol <br /> Acenaphthene N D 50 37 74 37 74 00 <br /> 4-Nitrophenol N D 100 23 23 20 20 14 <br /> 2,4-Dinitro- N D 50 32 64 33 66 31 <br /> toluene <br /> Pentachloro- N D 100 50 50 48 48 41 <br /> phenol <br /> Pyrene N D 50 55 110 55 110 00 <br /> Laboratory Biank contained the following analytes Nana detected <br /> SEQD A ANALYTICAL %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 /> Oo4ttA Chieffo (Conc of M S + Conc of M S D)/2 <br /> Project Manager 3010153 KEI > <br />