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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX(415) 364-9233 <br /> �s Q388v ` n Y�: . F� 'r+e,'•�"� o 'js�?xt,5`/,G��^L`Y�3�;n-i.-�`. <br /> �wx .:, a2Ye.-y�.1f.c-9��r ad..<i- •,t.; •y,,,r,.r n,...y .•,-� s•. � ..-'�i - ;ovtK.rs?r,.:.,�ar :wr•�-kr. <br /> b Waterwork Client Project lD A W , Reeves Exxon <br />' 1 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention _Lois FrantzCC Sample Group 112-3907, 3912, 3914 Reported Jan 6, 1992 <br /> ter';{ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> ' Benzene Toluene benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 BPA 8020 <br /> ' Analyst A.Miraftab A Miraftab A Miraftab A Miraftab <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Dec 31, 1991 Dec 31, 1991 Dec 31, 1991 Dec 31, 1991 <br /> ' QC Sample# GBLK123191 GBLK123191 GBLK123191 GBLK123191 <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> Sample Cone: 011060 - N D N D N D <br /> Spike Cone. <br /> ' Added: 020 020 020 060 <br /> Cone Matrix <br /> ' Spike: 020 020 020 061 <br /> Matrix Spike <br /> %Recovery: 100 100 100 102 <br /> Conc Matrix <br /> Spike Dup : 022 022 022 067 <br /> Matrix Spike <br /> ' Duplicate <br /> % Recovery: 110 110 110 117 <br /> Relative <br /> %Difference: 95 95 95 94 <br /> SEQUOIA ANALYTICAL %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 /> ' la ee f (Conc of M S + Conc of M S D)/2 <br /> P oject Manager 1123903 WAT <6> <br />