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� 4 <br /> j SEQUOIA ANALYTICAL <br /> 819 Sulker Avenue, Suite 8 - Sacramento, CA 95831 <br /> (916) 921 9600 - FAX (916) 921-0100 <br /> Groundwater Technology Client Project ID Golden Grain-Manteca <br /> 1401 Halyard Drive, Suite 140 <br /> West Sacramento, CA 95691 <br /> Attention Jahn Bower OC Sample Group 2020469-76 Reported Mar 4, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl. <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 6020 EPA 6020 EPA 8020 EPA 8020 EPA 7421 <br /> Analyst C Chapman C Chapman C Chapman C Chapman S Foster <br /> Reporting Units ppb ppb ppb ppb mg/L <br /> Date Analyzed Mar 3, 1992 Mar 3, 1992 Mar 3 1992 Mar 3, 1992 Feb 27, 1992 <br /> OC Sample# 202.0480 202-0480 202-0480 202-0480 202-0302 <br /> Sample Conc,: N D N D N D N D N D <br /> Spike Conc <br /> Added 10 10 10 20 1 <br /> Conc Matrix <br /> Spike 9 96 91 177 079 <br /> Matrix Spike <br /> % Recovery 90 96 91 88 79 <br /> Conc Matrix <br /> Spike Dup 89 95 89 174 083 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 89 95 89 87 83 <br /> Relative <br /> % Difference 1 1 1 22 1 7 4 9 <br /> .ISEQUOIA ANALYTICAL %Recovery Conc of N S Conc of Sample x 100 <br /> J/A�J/`1/�✓ / Spike Conc Added <br /> Relative Difference Conc of M 5 -Conc of M S D x 100 <br /> Michael R Giles (Conc of tdi S + Conc of MS[))/2 <br /> Laboratory Director 2020469 GGG <s> <br />