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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> Waterwork Client Project ID 475,Weber Point <br /> 1710 Main Street `{ <br /> Escalon, CA 95320 m <br /> �� on: Tina E e Pale QC Sample Group 21?_53-54 Reported- Feb 18, 1992 y <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Eth* <br /> Benzene Toluene benzene Xylenes <br /> Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst M Mpp M Kipp K N+pp K MPP <br /> Reporting Units pg/L Erg/L fig/I- Fg/L <br /> Date Analyzed. Feb 10, 1992 Feb 10, 1992 Feb 10, 1992 Feb 10, 1992 <br /> OC Sample#. GBLK021092 GBLK021092 GBLK021092 GBLK021092 <br /> MS/MSD MS/MSD 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. matriu <br /> Spike: 9.7 96 97 29 <br /> Matrix Spike <br /> %Recovery: 97 96 97 97 <br /> Conc. Matrix <br /> Spike Dup.: 92 92 91 27 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 92 92 91 90 <br /> Relative <br /> %Difference: 53 43 64 71 <br /> • SEQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> av `,a Relatnve%Difference Conc of M S -Cone of MSD x 100 <br /> o Conc of M S + Conc of M S D 2 <br /> JP0'Ject <br /> Ma <br /> Manager 2021253.WAT <3> <br />