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j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921 9600 • FAX (916) 921-0100 <br /> Groundwater Technology Client Project ID #023202124, Lammersville School Dist Y <br /> 1401 Halyard Drive, Sulte 140 <br /> West Sacramento, CA 95691 <br /> Attention Scott Gable h QC Sample Group 2010463-64 Reported Feb 7, 1992 <br /> wSC♦vv.. .v n r . vO ," v2k <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl. <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm <br /> Date Analyzed Feb 6, 1992 Feb 6, 1992 Feb 6, 1992 Feb pfi n1992 <br /> OC Sample # BLK020692 BLK020692 BLK020692 BLK020692 <br /> Sample Cone.- N D N D N D N D <br /> Spike Cone. <br /> Added 02 02 02 04 <br /> Cone Matrix <br /> Spike- 0 163 0 167 0 168 0 352 <br /> Matrix Spike <br /> % Recovery 82 84 84 88 <br /> Cone Matrix <br /> Spike Dup 0 187 0 192 0 192 0 399 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery. 94 96 <br /> 96 100 <br /> Relative <br /> % Difference 14 14 13 12 <br /> SEQUOIA ANALYTICAL % Recovery Cone of M S -Cone of Sample <br /> x 100 <br /> SprKe Cone Added <br /> /� f✓ ! �� <br /> Relative °ro Difference Cone of MS -Cone of N1 S D x 100 <br /> Michael R Giles <br /> Laboratory Director (Cont of M S + Cone of M S D)/2 <br /> 2010463 GGG <2> <br />