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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 e Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Delta Environmental Consultants Client Project ID #4091732, Ruiz Grocery, Tracy n„ r <br /> 3330 Data Drive, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> Attention Jim Brownell QC Sample Group 301-0109 Reported Jan 20, 1993 <br /> (QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ug/L ug/L ug/L ug/L <br /> Date Analyzed Jan 19, 1993 Jan 19, 1993 Jan 19, 1993 Jan 19, 1993 <br /> QC Sample# 301-0106 301-0106 301-0106 301-0106 <br /> Sample Conc N D N D N D N D <br /> Spike Conc <br /> Added: 10 10 10 20 <br /> Conc. Matrix <br /> Spire 95 97 96 19 <br /> Matrix Spike <br /> % Recovery 95 97 96 95 <br /> Conc. Matrix <br /> Spike Dup., 96 99 10 21 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 96 99 100 105 <br /> Relative <br /> % Difference: 1 0 20 41 10 <br /> 0 SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> �L4 Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S 0 x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director 3010109 DLT <2> <br />