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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 4, FAX (510) 686-9689 <br /> Kapreallan Engineering, Inca Client Project ID Unocal Bulk Plant #0950, Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kapreahan, P E OC Sample Group 2100024-26 Reported Oct 6, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8014 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nill K Ndl K Niil K Ndl <br /> Reporting Units ug/kg pg/kg pg/kg N9/kg <br /> Date Analyzed Oct 2, 1992 Oct 2, 1992 Oct 2, 1992 Oct 2, 1992 <br /> Sample# 210-0024 210-0025 210-0026 Matrix Blank <br /> Surrogate#1 <br /> % Recovery- 84 87 87 130 <br /> Surrogate#2 <br /> % Recovery. 118 115 98 122 <br /> 0 SEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> Scott A Chieffo (Cone of M S + Conc of M S D)/2 <br /> /44 Project Manager 2100024 KEI <9> <br />