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a <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue + Suite LM • Concord,California 94520 <br /> (510) 686-9066 0 FAX (510) 686-9689 <br /> 1 4 <br /> Kaprealian Engineering, Inc Client Project ID Unocal, Stocton, 7303 Pacrfic Ave <br /> P 0 Box 996 <br /> BeniCla, CA 94510 <br /> Attention Mardo Kaprealian, P E OC Sample Group 1092165-68 Reported Oct 17, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 EPAS015 EPAS015 <br /> Analyst R H/J F R H/J F R H/J F R H/J F R H/J F A Tuzon A Tuzon <br /> Reporting Units ug/L v9/L ug/L ug/L ug/L ug/I- "9/t <br /> Date Analyzed Oct 4, 1991 Oct 4, 1991 Oct 4, 1991 Oct 4, 1991 Oct 4, 1991 Oct 8, 1991 Oct 8, 1991 <br /> Sample # 109-2165 109-2166 109-2167 109-2168 Blank 109-2165 Bunk <br /> Surrogate <br /> % Recovery 100 97 98 97 100 150 93 <br /> II <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> r � Relative%Difference Cone of MS -Cone of M S D x 100 <br /> Belinda C Vega (cone of MS + cone of M s D) 2 <br /> Laboratory Director <br /> 1092165 KEI <7> <br />