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1 <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> 1 <br /> RESNA Industries Client Project ID Arco #2130, Stockton <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 2010051-53 Rd J 10, 1992 <br />� Reported an n <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 ppb ppb ppb ppb <br /> Date Analyzed Jan 9, 1992 Jan 9, 1992 Jan s, 1992 Jan 9, 1992 <br /> QC Sample # BLK010992 BLK010992 BLK010992 BLK010992 <br /> Sample Conc N D N D N D N D <br /> i � Spike Conc <br /> Added 10 10 10 20 <br /> Conc. Matrix <br /> Spike: 87 88 89 189 <br /> Matrix Spike <br /> % Recovery 87 88 89 94 <br /> Conc Matrix <br /> Spike Dup 89 93 91 194 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 89 93 91 97 <br /> Relative <br /> % Difference 1 1 55 22 26 <br /> iSEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> G /l `/� /,? Spike Conc Added <br /> (� / 1 [J/ Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director 2010051 RES <4> <br />