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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: EMCON Service Request: 59901001 <br /> Project: Teichert&Sons-Stockton/20F90-002.007 Date Collected: NA <br /> Sample Matrix: Soil Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: NA <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> Prep Method: EPA 5030 Units: PERCENT <br /> Analysis Method: 8020 CA/LUFT Basis: NA <br /> Test Percent Recovery <br /> Sample Name Lab Code Notes 4-Bromofluorobenzene a,a,a-Trifluorotoluene <br /> SP-1A/B 59901001-025 93 95 <br /> SP-2A/B 59901001-026 90 101 <br /> SP-3A/B 59901001-027 93 99 <br /> SP-4A/B 59901001-028 87 105 <br /> SP-5A/B 59901001-029 93 111 <br /> SP-6A/13 59901001-030 94 109 <br /> SP-7A/13 S9901001-031 81 110 <br /> SP-8A/B 59901001-032 95 98 <br /> SP-9A/B 59901001-033 80 103 <br /> SP-10A/13 59901001-034 79 106 <br /> . SP-11A/B 59901001-035 94 94 <br /> SP-12A/B 59901001-036 86 98 <br /> Method Blank S990402-SBI 102 102 <br /> CAS Acceptance Limits: 5I-137 51-137 <br /> • SUR2/020397p <br /> Page 33 <br />