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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> aprealian Engineering, Inc Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 3031170-73 Reported Apr 7, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nill K Nill K Nill K Nil[ K Nil[ <br /> Reporting Units ug/L u9IL u9/L u9/1- ug/L <br /> Date Analyzed Apr 2, 1993 Apr 2, 1993 Apr 2, 1993 Apr 2 1993 Apr 2, 1993 <br /> Sample # 303 1170 3031171 303 1172 303-1173 Matrix Blank <br /> i <br /> Surrogate#1 <br /> % Recovery 115 112 113 100 97 <br /> Surrogate #2 <br /> % Recovery 105 105 104 95 95 <br /> EOUOI -ANALYTICAL %Recovery Cone 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 /> tt C feffo (Conc of M S + Conc of M S D)/2 <br /> Project Manager 3031170 KEI -8? <br />