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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921 9600 • FAX (916) 921-0100 <br /> � <br /> egis Environmental Consultants Client Project ID Shell 620 W Charter Way Stockton <br /> 1050 Melody lane Ste 160 <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talanki OC Sample Group 3010116-17 Reported Jan 15, 1993 <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Methoo EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units mg/cubic m mg/cubic m mg/cubic m mg/cubic m <br /> Date Analyzed Jan 8 1993 Jan 8 1993 Jan 8 1993 Jan 8 1993 <br /> QC Sample # BLK010893 BLK010893 SLK010893 BLK010893 <br /> Sample Cone N D N D N D N D <br /> Spike Cone <br /> Added 20 20 20 40 <br /> Cone Matrix <br /> Spike 1 7 1 8 1 8 3 5 <br /> Matrix Spike <br /> % Recovery 85 90 90 88 <br /> Cone Matrix <br /> Spike Dup 1 8 1 9 1 9 3 7 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 90 95 95 92 <br /> Relative <br /> % Difference 5 7 5 4 5 4 5 6 <br /> SEQUOIA ANALYTICAL °o Recovery Conc of M S Conc of Sample x 100 <br />. / Spike Conc Added <br /> 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 3010116 AEG <3> <br />