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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client. ARCO Products Companv Service Request: 5951074 <br /> Project: 1775-229 001 1 TO## 17075 00 /2130 Stockton Date Collected 8/28/95 <br /> Sample Matrix Water Date Received: 8/29/95 <br /> Date Extracted: NA <br /> Date Analyzed 9/7/95 <br /> Surrogate Recovery Summary <br /> BTEX and TM as Gasoline <br /> 'r EPA Methods 5030/8020/California DHS LUT Method <br /> Percent Recovery <br /> Sample Name Lab Code u,a,ec-Trifluorotoiuene <br /> MW-1 (73) S51074-001 I07 <br /> MW-2 (72) 551074-002 106 <br /> MW-3 (73) 551074-003 100 <br /> MW-4(74) 551074-004 96 <br /> MW-5 (76) 551074-005 102 <br /> MW-6 (72) 551074-006 101 <br /> MW-7 (72) 551074-007 96 <br /> MW-8 (74) 551074-008 97 <br /> MW-10 (71) 551074-009 116 <br /> MW-4 (74)MS 551074-004MS 104 <br /> MW-4 (7.3) DMS 551074-004DMS 108 <br /> Method Blank 5950907-WB 101 <br /> Method Blank 5950908-WB 94 <br /> CAS Acceptance Limits 69-116 <br /> SURIM67994 <br /> Page 5 <br />