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41i i <br /> SEQUOIA ANALYTICAL <br /> 190- Bates Avenue Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Kapreallan Engineering, Inc Client Project ID Unocal/7303 Pacific Ave, Stockton <br /> P O Box 996 <br /> Benicia. CA 94510 <br /> Attention Mardo Kapreallan, P E QC Sample Group 1121160-1163 Reported Jan 15, 1992 <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 EPA 8015 EPA 8015 <br /> Analyst K N/J F K N/J F K N/J F K N/J F K N/J F A.Tuzon A Tuzon <br /> Reporting Units ug/L ug/L pg/L ug/L Frg/L Yg/L Ng/L <br /> Date Analyzed Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 9, 1992 Jan 9, 1992 <br /> Sample# 112-1160 112-1161 112-1162 112-1163 Blank 112-1160 Blank <br /> Surrogate <br /> %Recovery 98 100 96 86 98 110 100 <br /> I <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> ( Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Belinda C Vega (Cone of M S + Conc of M S D) 2 <br /> Laboratory Director 1121160 KEI <5> <br />