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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Senate Request: 5950269 <br /> Project ARCO Faciht� No 21301 EMCON Project No 1775-229 01 Date Collected: 2/28 3/1195 <br /> `-LmPle Nlatnx Water Date Received: 3/3/95 <br /> Date Extracted: NA <br /> Date Analyzed. 3/10-15/95 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Percent Recovery <br /> �ample Name Lab Cade cc a,cL-T rtfluorotoluene <br /> MW-I Ci') 5950269-001 87 * <br /> %[W-2 (72') 5950269-002 100 <br /> %IW-3 (72') 5950269-003 96 <br /> %IW-4 r74') 5950269-004 96 <br /> -5 (-5') 5950269-005 105 <br /> %IW-6 (72') 5950269-006 99 <br /> MW-7 (72') 5950269-007 93 <br /> %IW-9 (79') S950269-008 85 <br /> N1W-10 (71') 5950269-009 105 <br /> �[W-1 (73') MS 5950269-OO1MS 105 <br /> `IW-I a-3') DMS 5950269-OOIDMS 97 <br /> `zthod Blank 5950310-WB to0 <br /> `;.tltad Blank S950313-WB 90 <br /> Method Blank 5950315-WB 99 <br /> i / CAS Acceptance Ltrruts 69-116 <br /> The surrogate used for this sample was 4-bromoflurobenzene <br /> J ki <br /> Farmed By Date 17X7<— <br /> Page 5 <br />