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` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM • Concord, California 94520 <br /> NO (510) 686-9600 FAX (510) 686-9689 <br /> MPDS Services Client Project TD Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 <br /> Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 3121489-92 Reported Jan 7, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATI` <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nil K Nill K Ndl K Nil! K NEII <br /> Reporting Units lig/L N9/L us/L ug/L pg/L <br /> Date Analyzed 12/30/93 12/30/93 12/30/93 12/30/93 12/30/93 <br /> Sample# 312-1489 312-1490 312-1491 312-1492 Method Blank <br /> Surrogate #1 <br /> %Recovery 129 124 127 130 126 <br /> Surrogate#2 <br /> % Recovery 121 123 113 116 116 <br /> I <br /> I <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 — <br /> n Spike Conc Added <br /> `1 Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Ala e poer <br /> (Conc of M S + Conc of MSD)/2 <br /> Proj ct Mana <br /> 3121489 MPO <7> <br />