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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> CIient EMCON Service Request 59501433 <br /> Project Tetchert-Stockton/OF90-11112 004 Date Collected 11/13/05 <br /> Sample Matrix Water Date RccelVed 11/14/95 <br /> Date Extracted NA <br /> Date Analvzed 1 1/21 22195 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA %lahods 5030/8020/California DHS LUFT Method <br /> PID Detector FFD Detector <br /> Percent Recovery Percent Recovery <br /> Sample Name Lab Code 4-Bromofluorobenzene ix««—Trifluorotoluene <br /> MW-9 S9501.13-001 91 85 <br /> MW-10 S950143-002 89 98 <br /> MW-11 5950143-003 90 91) <br /> MW-14 S950143-004 86 106 <br /> . Method Blank S9501121-WMB 91 KS <br /> Method BIank 59501122-WM13 85 116 <br /> C-%S Acceptance Limits 69-116 69-116 <br /> SVR21060194 <br /> Page 5 <br />