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114) SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc Client Project 10 Unocal Sulk plant, 2835 Navy Dr,, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 2071114-116 Reported Aug 6, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br />, <br /> Method EPA8015 EPA8015 EPAS015 EPA8015 <br /> Analyst K Wimer K Wimer K Wimer K Wimer <br /> Reporting Units ug/L ug/L Yg/L Pg/L <br /> Date Analyzed Aug 4, 1992 Aug 4, 1992 Aug 4, 1992 Aug 4, 1992 <br /> Sample # 207-1114 207-1115 207-1116 Matrix Blank <br /> Surrogate <br /> % Recovery 100 119 88 101 <br /> SEQUOIA ANALYTICAL Recovery Cone o1 M S -Gone of Sample x 100 <br /> Spike Gone Added <br /> Relative%Difference Cone of M S -Conc of M S D x 100 <br /> Cott A h�eoI (Gone of M S + Gone of M S D)/2 2071114KFI <5> <br /> Project Manager <br />