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COLUM131A ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Associates Date Received: 07/28/93 <br /> Project: Teichert Construction/OF90-002.03 Service Request No.: SJ93-0932 <br /> 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-Trifluorotoluene <br /> MW-10 08/05/93 95. <br /> MW-11 08/05/93 90. <br /> MW-12 08/05/93 86. <br /> MW-13 08/05/93 101 . <br /> . Method Blank 08/05/93 84. <br /> CAS Acceptance Criteria 70-130 <br /> Approved by: —.. . i � *11�e c.` Date: <br /> 5 <br /> 1921 Ringwood Avenue • Son Jose. California 95131 D Telephone 408/437-2400 c Fox 4081437-9356 <br />