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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, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 2121175-78 Reported <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nill K Nill K Nill K Nill K Nill <br /> Reporting Units ps/L p9/L ps/L p9/L p9/L <br /> Date Analyzed Jan 7, 1993 Jan 7, 1993 Jan 7, 1993 Jan 7, 1993 Jan 7, 1993 <br /> Sample# 212-1175 212-1176 212-1177 212-1178 Matrix Blank <br /> i <br /> I <br /> Surrogate#1 <br /> % Recovery, <br /> 112 104 115 108 107 <br /> Surrogate#2 <br /> % Recovery: <br /> 104 104 98 94 108 <br /> 07SEQU41A ANALYTICAL �Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Shleffo (Cont of M 5 + Cone of M S D)/2 <br /> Project Manager 2121175 KEI 48> <br />