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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> ,Client EMCON Service Request 59600801 <br /> Prolef-t Teichert-Stockton/20F90-002 004/Task 001 Date Collected 5/I7/96 <br /> Sample Matrix Nater Date Received 5/21/96 <br /> Date Extracted NA <br /> Date Analyzed 5/24-28/96 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/Caldbrrua DHS LLTFT Method <br /> PID Detector FID Detector <br /> Percent Recovery Percent Recovery <br /> Sample Name Lab Code 4-Bromofluorobenzenc cx,a,a—Tnifluorctoluene <br /> MW-9 S9600801-001 96 100 <br /> MW-10 59600801-002 98 98 <br /> MW-11 59600801-003 98 104 <br /> MW-14 59600801-004 98 I 1 I <br /> • Method Blank 5960524-WB 1 95 IO2 <br /> Method Blank 5960528-WB 1 97 102 <br /> CAS Acceptance Limits 69-116 69-116 <br /> tiUR21060194 <br /> Page 5 <br />