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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Sates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suitt 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> MPDS Services Client Project ID Unocal #5098, 5606 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 400 <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4031433-36 Reported Apr 13, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8014 EPA 8014 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K N111 K Nlll K Ndl K N11! K Nill <br /> Reporting Units pg/L ug/L 119/1- frg/L ug/L <br /> Date Analyzed 4/1/94 4/1/94 4/1/94 4/1/94 4/1/94 <br /> Sample # 403-1433 403-1434 403-1435 403-1436 Matrix Blank <br /> Surrogate#1 <br /> % Recovery 114 102 119 121 124 <br /> Surrogate #2 <br /> % Recovery 109 106 115 111 101 <br /> SEQUOIA ANALYTICAL, #1271 %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 /> Ap (Conc of M S + Conc of M S D J/2 <br /> Project ager <br /> 4031433 MPD <7> <br />