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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (9 16) 921 9600 • FAX (9 16) 921-0100 <br /> Groundwater Technology Client Project ID #023202124, Larnmersville School <br /> 1401 Halyard Drive, Suite 140 <br /> West Sacramento, CA 95691 <br /> Attention ScottGable OC Sample Group 2010581-64 Reported Feb 11, 1992> <br /> QUALITY CONTROL DATA REPORT <br /> A N ALYTE 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 Feb 7, 1992 Feb 7, 1992 Feb 7, 1992 Feb 7, 1992 <br /> OC Sample # 201-0533 201-0533 201-0533 201-0533 <br /> Sample Cont.: N D N D N D N D <br />. Spike Cone <br /> Added: 10 10 10 20 <br /> Cone Matrix <br /> Spike* 9 5 10 9 7 203 <br /> Matrix Spike <br /> % recovery 95 100 97 102 <br /> Cone Matrix <br /> Spike Dup.- 9 4 9 9 9 7 199 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 94 99 <br /> 97 100 <br /> Relative <br /> % Difference 1 1 0 0 2 <br />. SEQUOIA ANALYTICAL Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> E, '(• Relative%Dtff <br /> Michael r Giles erence Conc of M S -Conc of M S D x 100 <br /> Laboratory Director (coni of M s + Conc of M S D /2 <br /> 2010581 GGG <2> <br />