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1 <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX(415)364-9233 <br /> Waterworfc �:.ient nh <br /> ClProject ID W0388, Reeves Exxon <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention Lois Frantz QC Sample Group 112-3916 Revised Jan 28, 1992 <br /> t -• h,tt.#rcr`` ~..~<%%'fi.^^.+'aV`t2 ,:.. o':n=...:rrr..s mow,. .~ . �s'im fk.`.<...rt r. .. ~ ~ sr...~ ,:r,4.rr ,c« tt `.<��.A'ww:�u•v: <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE <br /> tLead Chromium Cadmium Tnc <br /> Method EPA 7421 EPA 6010 EPA 6010 EPA 6010 <br /> ' Analyst M MLstry C Medefesser C Medefesser C Medefesser <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed pec 30, 1991 Dec 31, 1991 Dec 31, 1991 Dec 31. 1991 <br /> ' QC Sample # 112-3916 - 112-3615 112-3615 112-3615 <br /> Sample Conc: 84 079 N D 51 <br /> ArSpike Conc <br /> Added- 50 100 100 100_ <br /> Conc Matrix <br /> ' Spike. 59 110 100 150 <br /> Matrix Spike J <br /> ' % Recovery 100 109 100 99 <br /> ' Conc. Matrix <br /> Spike Dup. 59 110 110 160 <br /> Matrix Spike <br /> ' Duplicate <br /> % Recovery 100 109 110 109 <br /> ' Relative <br /> % Difference 00 00 95 65 <br /> 1 <br /> .►E000IA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> I <br /> a <br /> Relative 96 Difference Conc of M S -Conc of M S D x 100 <br /> ' r <br /> Je (Conc of M S + Conc of M S D) 2 <br /> P oiect Manager 1123903 WAT <10> <br />