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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/OC Report <br /> Client EMCON Associates Date Received 01/22/93 <br /> Project- EMCON Project No OG71-029 01 Service Request No : SJ93-0096 <br /> ARCO Facility No 2130 Sample Matrix- Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Tnfluorotoluene <br /> MW-1 (74) 02/01/93 94 <br /> MW-2 (72) 01/28/93 103 <br /> MW-3 (73) 01/27/93 94 ' <br /> MW-4 174) 02/01/93 89 <br /> MW-5 (76) 01/28/93 90 <br /> MW-4174) MS 01/28/93 100 <br /> MW-4174) DMS 01/28/93 98 <br /> Method Blank 01/27/93 93 <br /> Method Blank 01/28/93 95 <br /> Method Blank 02/01/93 84 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> The surrogate used for this sample was 4-Bromofluorobenzene <br /> Approved by Date — �y � <br />