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S <br /> COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: nItCO Products Compmy5ervicc Request: 59700533 <br /> Project: 21775-237.003/T0#19350.00/2186 STOCKTON Date Collected: 3/21197 <br /> Sample Matrix: Wiaer Date Received: 3114/97 <br /> Date Extracted: NA <br /> Date Analyzed: NA <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> Prep Method: 50.10 Units: PERCENT <br /> Analysis Method: C'A/L tj T/8020 Basis. NA <br /> Test Percent Recovery <br /> Sample Name Lah Code Notes 4-Bromotluorobenzene a,a,a-Trifluorotoluene <br /> MW-1 (74) 59700333-001 94 <br /> 02 <br /> MW-2 (74) 59700533-002 101 192 <br /> MW-3(73) 59700533-003 98 91 <br /> MW-3D(60) 59700533-004 98 too <br /> MW-2(74)(MS) S9700533-002MS 96 97 <br /> MW-2(74)(DMS) 59700533-002DMS 96 102 <br /> Method Blank S9700401-WBI 96 91 <br /> Method Blank S970040I-WB2 97 92 <br /> CAS Acceptance Limits: 69-116 69-116 <br /> SUR2J02097p <br /> 4100D3ALS-SUR Page 10 <br /> Page No.: <br />