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j 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 ID Unocal s/s #5421, 7303 Pacific Ave, Stockton10, n l <br /> 2401 Stanwell Dave, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E CC Sample Group 208-0955 Reported Aug 25, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Trichloro- Chloro- <br /> 1,1-Dichloroethene ethane benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K N+II K Nill K Nill <br /> Reporting Units pg/L frg/L erg/L <br /> Date Analyzed Aug 24, 1992 Aug 24, 1992 Aug 24, 1992 <br /> QC Sample# Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc N D N D N D <br /> Spike Conc <br />. Added 10 10 10 <br /> Conc Matrix <br /> Spike 10 10 93 <br /> Matrix Spike <br /> % Recovery 100 100 93 <br /> Conc. Matrix <br /> Spike Dup : 10 11 97 <br /> Matrix Spike <br /> Duplicate <br /> • Recovery 100 110 97 <br /> Relative <br /> • Difference: 00 95 42 <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 /> �SEQ IA ANALYTICAL %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 /> colt A Chieff (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2080955 KEI <4> <br />