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` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> preallan l:ngineering, Inc Chent project ID Unoc4#5098, 5606 Pacific Ave, Stockton j <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 2051170-1180 Reported Jun 9, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Tnchloro- Chloro- <br /> 1,1-Dichloroethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst M Nguyen M Nguyen M Nguyen <br /> Reporting Units ug/Kg ug/Kg ug/Kg <br /> Date Analyzed Jun 4, 1992 Jun 4, 1992 Jun 4, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone : N D N D N D <br /> Spike Cone. <br /> Added: 10 10 10 <br /> Cone. Matrix <br /> Spike- 11 11 10 <br /> I <br /> Matrix Spike <br /> %Recovery: 110 110 100 <br /> Cone Matrix <br /> Spike Dup. 12 11 97 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 120 110 97 <br /> Relative <br /> % Difference. 87 00 31 <br /> Laboratory blank contained the following analytes None Detected <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> A7iT <br /> %Recovery Conc of M S -Conc of Sample x 1D0 <br /> Spike Cone Added <br /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> (Coni of MS + Conc of M S D /2 <15> <br /> jMager <br />