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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Associates Date Received: 02/24/93 <br /> Project: Teichert Construction/OF90-002.03 Service Request No.: SJ93-0262 <br /> Sample Matrix: Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/California DHS LUFT Method <br /> Samole Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluarotoluene <br /> MW-10 03/05/93 112. 4 <br /> MW-1 1 03105/93 95. <br /> MW-12 03/05/93 97. <br /> MW-13 03/05/93 115. <br /> . MW-13 (MS) 03/05/93 113. <br /> MW-13 IDMS) 03/05/93 112. <br /> Method Blen.% 03/05/93 98. <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> a The surrogate used for this sample was 4-Bromofluarobenzens. <br /> Approved by: Date: <br /> 11921 Ringwood Avenue • Son Jose. Colifornla 95131 • Telephone 4081437.2400 Fox 4081437.9356 <br />