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at) SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX(415)364-9233 <br /> IN :: I�!:::: AN m: <br /> RESNA Client Project ID• W0475,Weber Point <br /> 1710 Main Street <br /> Escalon. CA 95320 <br /> Attention: Tina Le Page OC Sample Group. 206-3324 Reported Jun 23, 199¢ <br /> �Fwo�wr��'a. 4 � cGti�SGiLdk.wt�" a�4to. � <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene benzene X enee <br /> Method: EPA= EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. M mpp K MPP M NPP M NPP <br /> Reporting Units. P9/L kg/L mg/L use/L <br /> Date Analyzed Jun 18, 1992 Jun 18, 1992 Jun 18, 1992 Jun 18, 1992 <br /> OC Sample# GBLK061892 GBLK061892 GBLK061892 GBLK061892 <br /> MS/MSD MS/MSI) MS/MSD MS/MSD <br /> Sample Conc.: N D N D N D N D <br /> Spike Conc. <br /> . Added: 10 10 10 30 <br /> Conc. Matrix <br /> Spike: 11 11 11 33 <br /> Matrix Spike <br /> %Recovery: 110 110 110 110 <br /> Conc. Matrix <br /> Spike Dup.: 12 12 12 35 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 120 120 120 117 <br /> Relative <br /> %Difference: 8.7 8.7 8.7 59 <br /> SEQUOIA ANALYTICAL %Recovery- Conc of M S -Conc of Sample x 100 <br /> Spike Cone Added <br /> Relative%DMarence Conc of M S -Conc of M S D x 100 <br /> ria (Conc of M S + Conc of M S D) 2 <br /> roject Manager 3MWAT T2s <br />