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` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue 0 Suite LM * Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> prealiar� Engjneer�ng, Inc etinn � v v •vim tiv n. 098, <br /> 9n8, 56n 6n Pcnirf+}icrnAve, <br /> rvme,•Stov cvkv t•o{n wCvl}"nt �rojekcit ICS lnoca(# na .vhS�+n� ti n v4r yv <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> {Attention Mardo Kaprealian, P E QC Sample Group 2051170-1180 Reported Jun 9, 1992 <br /> v ♦ i t h l..r... v v n• y r + vv ..v n ryn ry r '+.: ` +. + � ryr. .w v v v vr h+4 v r v <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 5010 EPA 8010 EPA 8010 <br /> Analyst M Nguyen M Nguyen M Nguyen M Nguyen M Nguyen M Nguyen M Nguyen <br /> Reporting Units ug/Kg ug/Kg ug/Kg ug/Kg ug/Kg ug/Kg ug/Kg <br /> Date Analyzed Jun 3, 1992 Jun 3, 1992 Jun 3, 1992 Jun 3, 1992 Jun 3, 1992 Jun 3, 1992 Jun 3, 1992 <br /> Sample# 205-1170 205-1171 205-1172 205-1173 205-1174 205.1175 205-1176 <br /> Surrogate#1 <br /> %Recovery 120 98 115 100 103 113 118 <br /> I <br /> Surrogate#2 <br /> %Recovery 103 100 100 98 98 105 103 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> r <br /> Relative%Difference Cono of M S -Conc of M S D x 100 <br /> tt C le (Cont of M S + Conc of MSD)/2 > <br /> Project Manager <br />