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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 1D Unocal #5421, 7303 Pacific 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 8010 EPA 8010 EPA 8010 EPA 6010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nill K Nill K N,II K NO K Nill K Nill K Nill <br /> Reporting Units ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> Date Analyzed Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 <br /> Sample# 211-0498 211-0499 211-0500 211-0501 211-0502 211-0503 211-0504 <br /> Surrogate#1 <br /> % Recovery 124 126 103 129 122 113 122 <br /> Surrogate#2 <br /> % Recovery 106 101 100 105 102 101 106 <br /> SEQUOIA-ANALYTIC %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Cone of MS -Conc of M S D x 100 <br /> tt A hi (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2110502 KEI <28> <br />