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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> . Client ARCO Products Company Service Request: S9700930 <br /> Protect: 21775-234 0021TO#21333 0012168 STOCKTON Date Collected: NA <br /> Sample Matrix: Water Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: NA <br /> Surrogate Recovery Summary <br /> BTEX, MTBE and TPH as Gasoline <br /> Prep Method EPA 5030 units PERCENT <br /> Analysis Method 8020 CA/LUFT Bans NA <br /> Test Percent Recovery <br /> Sample Name Lab Code Notes 4-Bromofluorobenzene a,a,a-TnfIuorotoluene <br /> MW-1 (53) S9700930-001 100 96 <br /> MW-2(53) S9700930-002 98 100 <br /> MW-3(53) S9700930-003 96 96 <br /> MW4(58) S9700930-004 99 99 <br /> MW-5(55) 59700930-005 97 101 <br /> MW-6(4 1) 59700930-006 100 100 <br /> MW-7(47) 59700930-007 100 101 <br /> BATCH QC S9700932-001 MS 98 99 <br /> BATCH QC S9700932-OOIDMS 98 93 <br /> Method Blank S970529-WB 1 100 96 <br /> Method Blank S970530-WB 1 100 99 <br /> CAS Acceptance Linuts 69-116 69-116 <br /> SUKV020397p <br /> Page 15 <br />