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r <br /> V <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave , Stockton <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E OC Sample Group 1060740-43 Reported Jul 11, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Chloro- Chlora- <br /> 1,1-Dichloroethene Trichloroethene benzene Benzene Toluene benzene (PID) <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst S Le S Le S Le S Le S Le S Le <br /> Reporting Units ppb ppb ppb ppb ppb ppb <br /> Date Analyzed Jul 3, 1991 Jul 3, 1991 Jul 3, 1991 Jul 3, 1991 Jul 3, 1991 Jut 3, 1991 <br /> OC Sample# 106-0718 106-0718 106-0718 106-0718 106-0718 106-0718 <br /> Sample Conc N D N D N D N D N D N D <br />'Spike Conc <br /> Added 10 10 10 10 10 10 <br /> Conc Matrix <br /> Spike 84 10 11 98 86 91 <br /> Matrix Spike <br /> % Recovery 84 100 110 98 86 91 <br /> Conc Matrix <br /> Spike Dup 79 97 11 97 86 90 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 79 97 110 97 86 90 <br /> Relative <br /> % Difference 61 3 0 0 10 0 1 1 <br /> Laboratory blank contained the following analytes None Detected <br /> 4101.11011A ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> V� Relative%Dhfference Conc of M S -Conc of M S D x 100 <br /> Belinda C Ve a / (Conc ofMS S + Conc of M S D <br /> g ) 2 <br /> Laboratory Director 1060740 KEI <9> <br />