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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921 9600 FAX (916) 921-0100 <br /> Groundwater Technology Client Project ID Larnmersvllle School District <br /> 1401 Halyard Drive, Suite 140 <br /> West Sacramento, CA 95691 <br /> Attention Scott Gable OC Sample Group 2070588-94 Reported Aug 4, 1992- <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 ppb ppb ppb ppb <br /> Date Analyzed Aug 3 1992 Aug 3, 1992 Aug 3, 1992 Aug 3 1992 <br /> OC Sample # 207-0588 207-0588 207-0588 207-0588 <br /> Sample Conc N D N D N D N D <br /> *Spike Conc <br /> Add ed 10 10 10 20 <br /> Conc Matrix <br /> Spike 91 9 8 9 7 18 <br /> Matrix Spike <br /> % Recovery 91 98 97 90 <br /> Conc Matrix <br /> Spike Dup 10 11 11 20 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 100 110 110 100 <br /> Relative _ <br /> % Difference 94 12 = 13 10 <br /> _Q�U01AA77ANALYTICCAL Recovery Conc of M S -Conc of Sample X 100 <br /> '��LJ:, l�L/ Spike Conc Added <br /> ReWive `>fl 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 <br /> 2070588 GRW <2> <br />