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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> 46Kaprealian Engineering, Inc Client Project ID' Unocal s/s #5421, 7303 Pacific Ave , Stockton <br /> 2401 Stanwell Drive, Surte 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 208-0955 Reported Aug 25, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 <br /> Analyst K Nilt K will <br /> Reporting Units pg/L <br /> Date Analyzed Aug 24, 1992 Aug 24, 1992 <br /> Sample # 208-0955 Blank <br /> Surrogate#1 <br /> % Recovery- 88 92 <br /> Surrogate#2 <br /> %Recovery 122 86 <br /> 7Project: <br /> EQ OIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> rRelative%DEfference Conc of M S -Conc of M S D x 100 <br /> co A leffo (Cont of M S + Conc of M S D)/2 <br /> Manage 2080955 KEI <5> <br />