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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Rapreahan Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave , Stockton <br /> 401 Stanwell Dr, Ste 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 3060894-897 Reported Jul 1, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8015 EPA 8015 <br /> Analyst KW KW <br /> Reporting Units ug/t u9/L <br /> Date Analyzed Jun 25, 1993 Jun 25, 1993 <br /> Sample # 306-0894 Blank <br /> a <br /> Surrogate <br /> % Recovery 97 84 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> t 1� Relative% Difference Cone of M S -Cone of M S D x 100 <br /> Alan B-K (Cone of M S + Conc of M S D)/2 <br /> P,rorect Manager <br /> 3060894 KEI <10> <br />