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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 9 FAX (916) 921-0100 <br /> EMCON Associates Client Project ID Shell, 4445 Pershing Ave , Stockton <br /> 1433 N Market Blvd <br /> Sacramento, CA 95834 <br /> Attention Jim Pittilla OC Sample Group 2100199-205 Reported Oct 22, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravalloti Chiaravaliod Chiaravallod Chiaravalloti <br /> Reporting Units hep/L leg/L }+p/t_ Np/L <br /> Date Analyzed Oct 19, 1992 Oct 19, 1992 Oct 19, 1992 Oct 19, 1992 <br /> CC Sample # 210-0200 210-0200 210-0200 210-0200 <br /> Sample Conc N D N D N D N D <br /> Spike Conc <br />. Added: 10 10 10 20 <br /> Conc. Matrix <br /> Spike: 87 93 89 17 <br /> Matrix Spike <br /> %Recovery: 87 93 89 85 <br /> Conc. Matrix <br /> Spike Dup.: 90 96 92 18 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 90 96 92 90 <br /> Relative <br /> %Difference: 34 32 33 57 <br /> SE01.101A ANALYTICAL %Recovery Conc of M S -Conc of Sample X 100 <br /> �C� Spike Conc Aided <br /> W/A& Relative%Difference Conc of M S -Cone of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M SD)/)/2 <br /> Laboratory Director <br /> 2100199EMC <5> <br />