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440�) SEQUOIA ANALYTICAL <br /> wW— F1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal #5421, 7303 Pacfic Ave , Stockton <br /> 401 Stanwell Drive, Suite 400 <br /> IlWoncord, 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 8015 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 20, 1992 Nov 20 1992 Nov 20, 1992 Nov 20, 1992 Nov 20, 1992 Nov 20, 1992 <br /> Sample# 211-0491 211-0492 211-0493 211-0494 211-0495 211-0496 211-0497 <br /> Surrogate <br /> % Recovery 110 113 107 114 110 113 100 <br /> SEQUOIA NALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Cont Added <br /> 4gr <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> ott A Chieffo (Cont of M S + Conc of M S D)/2 <br /> Project Manager 2110502 KEI <22> <br />