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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> iClient: ARCO Products Company Service Request: s97oo959 <br /> Project: 21775-237.01)211'0#21333.0012186 STOCKTON Date Collected: NA <br /> Sample Matrix: Nater 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 /> Analvsis Method: x;020 CAILUFT Basis: NA <br /> Test Percent Recovery <br /> Sample Name Lah Code Notes 4-Bromofluorobenzene a,a,a-Tritluorotcluene <br /> MW-1 (74) S9700959-001 99 96 <br /> MW-2(74) 59700959-002 98 96 <br /> MW-3(74) 59700959-003 102 97 <br /> VW-3D(45) 59700959-004 99 108 <br /> MW-2(74) 59700959-002MS 96 106 <br /> MW-2(74) 59700959-002DMS 99 105 <br /> Method Blank 5970602-WBI 101 96 <br /> CAS Acceptance Limits: 69-116 69-116 <br /> i <br /> SURVD20s97p <br /> Page 9 of 11 <br />