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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Associates Date Received 01/23/92 <br /> Project EMCON Project No G71-19 01 Work Order # SJ92-0086 <br /> Arco Facility No 2133 Sample Matrix. Water <br /> QA/QC Report <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Sample Name Date Analyzed Percent Rec2vgry <br /> a,a,a-Trifluorotoluene <br /> PR-1 (27) 01/27/92 98 <br /> PR-2 (27) 01/27/92 102 <br /> BHD-1 (27) 01/28/92 119 <br /> HHD-2 {28} 01/27/92 101 <br /> E-2 (21 5) 01/28/92 106 * <br /> E-4 (21) 01/28/92 112 * <br /> E-7 (19) 01/28/92 118 * <br /> E-8 123) 01/28/92 107 * <br /> E-10 (22) 01/29/92 105. <br /> E-11 (23) 01/29/92 125 <br /> E-12 (22 5) 01/27/92 100 * <br /> E-7 (19) (MS) 01/28/92 110 <br /> E-7 (19) (MSD) 01/28/92 113 <br /> Method Blank 01/27/92 105 <br /> Method Blank 01/28/92 99 <br /> Method Blank 01/29/92 105. <br /> CAS Acceptance Catena 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> The surrogate used on these samples was 4-BromofIuorobenzene <br /> s <br /> 1 .�v �rZ <br /> Approved by DateZ1 L�i Z <br /> 8 <br /> 1921 Ringwood Avenue • Son Jose California 95131 • Telephone 408/407 2400 • Fox 4081407 9356 <br />