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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 0 FAX (510) 686-9689 <br /> Xapreailan Engineering, Inc Client Project ID Unocal Bulk Plant#0950, Stockton <br /> v <br /> 2401 Stanwell DrFve, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kapreallan, P E QC Sample Group 2100024-26 Reported Oct 6, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> , <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- <br /> Mercury Nickel zinc ethene ethene benzene <br /> Method EPA 7471 EPA 6010 EPA 6010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst D Ballard V Owens V Owens K Nill K Nill K Nill <br /> Reporting Units mg/kg mg/kg mg/kg ug/kg ug/kg pg/kg <br /> Date Analyzed Oct 5, 1992 Oct 5, 1992 Oct 5, 1992 Oct 2, 1992 Oct 2, 1992 Oct 2, 1992 <br /> QC Sample # 210-0013 209-0348 209-0348 Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc : 0 028 10 230 N D N D N D <br /> Spike Conc <br /> • Added, 025 50 50 10 10 10 <br /> Conc. Matrix <br /> Spike- 028 60 270 96 11 10 <br /> Matnx Spike <br /> % Recovery: 101 100 80 96 110 100 <br /> Conc. Matrix <br /> Spike Dup.: 027 60 270 88 94 87 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 99 100 80 88 94 87 <br /> Relative <br /> %Difference 36 00 00 87 16 14 <br /> Laboratory Blank contained the following analytes None detected <br /> SEQUOIA AN ICAL %Recovery Conc 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 Chleffo (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2100024 KEI <8> <br />