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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Alk&prealian Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave, Stockton <br /> P O Bax 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E OC Sample Group 212-1179 Reported Jan 8, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 5015 EPA 8015 <br /> Analyst K Wimer K wmer <br /> Reporting Units 11s/L ugly <br /> Date Analyzed Jan 7, 1993 Jan 7, 1993 <br /> Sample # 212-1179 Matrix Blank <br /> • <br /> Surrogate <br /> %Recovery. 117 117 <br /> SEOU ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br /> O hieff0 (Cone of M S + Cone of M S D)/2 <br /> Project Manager 2121179 KEI <3> <br />