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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> preaflan'Erigineering,`IncAa =A ~ ' Client Project(0-Lineal #5098, 5606 Pacffic Ave,`Stockton <br /> P O BOX 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2051170-1180 Reported Jun 9, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst M Nguyen M Nguyen M Nguyen M Nguyen M Nguyen <br /> Reporting Units ug/Kg ug/Kg ug/Kg ug/Kg ug/Kg <br /> Date Analyzed Jun 3, 1992 Jun 4, 1992 Jun 4, 1992 Jun 4, 1992 6/4-6/5/92 <br /> Sample# 2055-1177 205-1178 205-1179 205-1180 Blank <br /> i <br /> Surrogate#1 <br /> % Recovery- 120 100 100 110 110 <br /> Surrogate#2 <br /> % Recovery 100 118 118 110 120 <br /> SLEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Cone Added <br /> Relative% Difference Cone of M S -Cone of M S D x 100 <br /> Scott A Chieffo (Cone of MS + Cone of M S D)/2 - 2051170. <br /> Project Manager <br />