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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 /> aprealJan Engineering, Inc Cilent Project iD Unocal, 7303 Pacific Ave , Stockton <br /> 401 Stanwell Dr, Ste 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 3060894-897 Reported Jul 1, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 <br /> Analyst KN KN <br /> Reporting Units ug/L ug/L <br /> Date Analyzed Jun 27, 1993 ,Jun 27, 1993 <br /> Sample # 306-0894 Blank <br /> i <br /> Surrogate#1 <br /> % Recovery 124 118 <br /> Surrogate#2 <br /> % Recovery 129 120 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> t Spike Conn Added <br /> 1\ / Relative% Difference Conc of M S -Conc of M S D x 100 <br /> Ala`W5-Kern �� (Conc of M S + Conc of M S D)72 <br /> Project Manager <br /> 3060894 KEI <11> <br />