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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client: EMCON Associates Date Received 09/02/93 <br /> Project: EMCON Project No OG71-038 01 Service Request No SJ93-1101 <br /> ARCO Facility No 2168 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> Halogenated Volatile Organic Compounds <br /> EPA Methods 5030/601 <br /> Sample Name Date Analyzed Percent Recovery <br /> 4-Bromofluorobenzene <br /> MW-1 (54) 09/10/93 78 <br /> Mw-2 (53) 09/10/93 94 <br /> MW-3 (53) 09/15/93 83 <br /> MW-4 (59) 09/10/93 71 <br /> MW-5 (55) 09/10/93 70 <br /> MW-3 (53) MS 09/15/93 70 <br /> MW-3 (53) DMS 09/15/93 77 <br /> Method Blank 09/10/93 88 <br /> Method Blank 09/15/93 99 <br /> CAS Acceptance Criteria 70-130 <br /> Approved by Date Se, f <br /> _ _ 14 <br />