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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM e Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal #5421, 7303 Pacrfic Ave , Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 2110460-516 Reported Nov 25, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8015 EPA 5015 EPA 8015 EPA 8015 EPA 8015 EPA 8015 EPA 8015 <br /> Analyst K Wimer K Wimer K Wimer K Wimer K Wimer K Wimer K Wimer <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Nov 20, 1992 Nov 23, 1992 Nov 23, 1992 Nov 23, 1992 Nov 23, 1992 Nov 23, 1992 Nov 23, 1992 <br /> Sample# 211-0498 211-0499 211-0500 211-0501 211-0502 211-0503 211-0504 <br /> Surrogate <br /> % Recovery 109 114 i11 118 111 116 711 <br /> SEQUO ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Cone Added <br /> r <br /> Relative%Difference Cone of M S -Conc of M S D x 100 <br /> colt A leffo (cone of M S + Cone of M S D)/2 <br /> Project Manager 2110502 KEl <23> <br />