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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Associates Date Received: 12/08/92 <br /> Project: Teichert Construction/OF90-002.01 Service Request No.: SJ92-1540 <br /> Sample Matrix: Water <br /> 1 <br /> 1 <br /> Surrogate Recovery Summary <br />' BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California OHS LUFT Method <br />' Sample Name Date Analyzed Percent Regovery <br /> a,a,a-Trifluorotoluene <br /> MW-10 12/08/92 124. <br /> MW-11 12/08192 115. <br /> MW-12 12/08/92 110. <br /> MW-13 12/11/92 111 . <br /> Method Blank 12/08/92 108. <br /> Method Blank 12/11/92 113. <br /> 1 <br /> CAS Acceptance Criteria <br /> 70-130 <br /> 1 <br /> TPH Total Petroleum Hydrocarbons <br /> ' The surrogate used for this sample was 4-Bromofluorobenzene. <br /> Date: <br /> Approved by: �'" adLz=- <br /> 5 <br /> 1921 Ringwood Avenue ® Son Jose, California 95131 o Telephone 408/437.2400 • Fox 4081437-9358 <br />