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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord, California 94520 <br /> (510) 686-9600 - FAX (510) 686-9689 <br /> Yw�i00M4{ A Y:Kv+V n �v s • M1}w vvr vxx rxn n+ nnnk1vti tiv' ry • v v . .. ..hen <br /> µprealiar3 Engineering, Inc Client Project Ili}Unocal #5098, 5606 Pacific Ave ,Stockton Y <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> vAttention Mardo Kaprealian, P E OC Sample Group 2051170-1180 Reported Jun 9, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 6015/8020 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst J Dinsay J Dinsay J Dinsay J Dinsay J Dinsay J Dinsay J Dinsay <br /> Reporting Units mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg <br /> Date Analyzed 5/29-6/1/92 5/29-6/1/92 5/29-6/1/92 5/29-6/1/92 5/29-6/1/92 5/29-6/1/92 5/29-6/1/92 <br /> Sample# 205-1170 205.1171 205-1172 205-1173 205-1174 205-1175 205-1176 <br /> • <br /> Surrogate <br /> %Recovery: 95 91 86 103 84 86 79 <br />*SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Cone of M S D x 100 <br /> Scott A Chie o (Cont of M S + Conc of M S D)/2 <br /> Project Manager <br />