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1 0 <br /> I (j) SEQUaOIA ANALYTICAL <br /> (415)Chesape364-9600 FAX (415) 364-9233 City,Drive - Redwood 84063 <br /> ' Environmental Science&Engineering Client Project ID: 6-90-5137/Ryder Truck Rental <br /> 4090 Nelson Avenue Ste. J Method: EPA 8270 <br /> Concord CA 94520 Analyst(s): S. Scott O.C. Sample Dates <br /> Attention Sue Wickham OC Sample#: BLK030191 Extract <br /> ed: Mar 1, 1991 <br /> Analyzed: Mar 3, 1991 <br /> Reported: Mar 12, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Conc. Matrix Spike <br /> Conc. Spike Matrix Duplicate Relative <br /> Sample Spike Conc. Matrix % <br /> Analyte Conc. Added Spike RSpike % %ecovery Duplicate Recovery Difference <br /> ' Phenol N.D. 100 <br /> 81 81 69 69 16 <br /> 2-Chlorophen0l N.D. 100 86 <br /> ' 88 72 72 17 <br /> 1,4-Dichloro- N.D. 50 40 <br /> ' benzene 80 33 66 19 <br /> N-Nitroso-Di-N- N.D. 50 40 80 <br /> propylamine 34 68 16 <br /> ' 1,2,4-Trichloro- N.D. 50 43 86 <br /> benzene 36 72 17 <br />' 4-Chloro- N.D. 100 87 87 77 <br /> 3-Methylphenol 77 12 <br />' Acenaphthene N.D. 50 45 90 39 78 <br /> 14 <br />' 4-Nitrophenol N.D. 100 71 71 61 61 15 <br /> 2,4-Dinitro- N.D. 50 33 66 29 58 13 <br /> toluene <br /> Pentachloro- N.D. 100 92 92 a� 83 10 <br /> phenol <br /> Pyrene N.D. 50 72 140 33 66 <br /> 8.6 <br /> I <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample x 700 <br /> ISpike Conc.Added <br /> V� Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Belinda C. Vegu <br /> Laboratory Director (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> #1020587.EEE <10> <br />