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D4 SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> 'Ile I <br /> W-prealian Engineerin-g, lnc ` Client Project,ID Unocal#6098, 5606 Pacif)c Aye -Stockton' <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2051170-1180 Reported Jun 9, 1992 <br /> nhry AMi AYhv.tr.Wx Ri.Jxn rl N vJ.I.. .+v}r .. } t fn 2v n r 4 h.rv. v ..v. n r }i . v.vv ,.,.,.. v,.. ,.. .t n+.+3 n•f iA v vv0'. n <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst J Dinsay J Dinsay J Dinsay J Dinsay <br /> Reporting Units mg/Kg mg/Kg mg/Kg mg/Kg <br /> Date Analyzed Jun 1, 1992 Jun 1, 1992 Jun 1, 1992 Jun 1, 1992 <br /> OC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc: N D N D N D N D <br /> Spike Conc <br /> Added: 020 020 020 060 <br /> Conc. Matrix <br /> Spike 019 019 018 055 <br /> Matrix Spike <br /> %Recovery: 95 95 90 92 <br /> Conc Matrix <br /> Spike Dup • 018 019 019 056 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 90 95 95 93 <br /> Relative <br /> % Difference 54 0 0 54 1 8 <br /> Laboratory blank contained the following analytes done Detected <br /> SEQUOIA 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 /> AcoqttChieffa (Conc of M S t Conc of M S D)/2 > <br /> Project Manager <br />