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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal,7303 Pacific Ave,Stockton <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E OC Sample Group 1030899-902 Reported Apr 10, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA8015/8020 EPA8015/8020 EPA8015/8020 EPAS015/8020 EPAS015/8020 <br /> Analyst E Hamilton E Hamilton E Hamilton E Hamilton E Hamilton <br /> Reporting Units mg/L mg/L mg/L mg/L mg/L <br /> Date Analyzed Apr 8, 1991 Apr 8, 1991 Apr 8, 1991 Apr 8, 1991 Apr 8, 1991 <br /> Sample# 103-0899 103-0900 103-0901 103-0902 Blank <br /> 0 <br /> Surrogate <br /> %Recovery. 97 90 87 87 97 <br /> OEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Gone Added <br /> t�ta Relative%Difference Cone ofMS -Cone ofMSD x 100 <br /> Belinda C I (Cone of M S + Conc of M S D)/2 <br /> Laboratory Director 1030899 KEI <3> <br />