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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> WWW (510) 686-9600 • FAX (510) 686-9689 <br /> AMPprealian Engineering, Inc Client Project ID Unocal#5421,7303 Pacific Ave, Stockton <br /> 401 Stanweii Drive, Suite 400 Method (units) EPA 8240 (pg/L purged) Q C Sample Dates <br /> Concord, CA 94520 Analyst(s) Megan Nguyen <br /> Attention Mardo Kaprealian, P E CC Sample# Matrix Blank Analyzed Nov 17, 1992 <br /> Reported Nov 25, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Conc Matrix Spike <br /> Conc Spike Matrix Duplicate Relative <br /> Sample Spike Conc Matrix % Spike % % <br /> Analyte Conc Added Spike Recovery Duplicate Recovery Difference <br /> 1,1-Dichloro- ND 50 50 100 49 97 24 <br /> ethene _ <br /> Trichloroethene ND 50 46 91 44 88 31 <br /> Benzene ND 50 49 99 48 96 29 <br /> Woluene N D 50 47 94 46 92 1 3 <br /> Chiorobenzene N D 50 47 95 46 92 26 <br /> Laboratory Blank contained the following analytes Hone detected <br /> 7SEQ IA ANAL ]CAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative% Difference Conc of M S -Conc of M S D x 100 <br /> Scott A Chieff (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2110502 KEl <20> <br />