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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Service Request: S9900997 <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 /> TPH as Diesel <br /> Prep Method: LUFT Units: PERCENT <br /> Analysis Method: California DHS LUFT Basis: NA <br /> Test Percent Recovery <br /> Sample Name Lab Code Notes p-Terphenyl <br /> TK-SE 59900997-001 93 <br /> TK-8C S9900997-002 110 <br /> TK-8W 59900997-003 92 <br /> DS-1(3.5) 59900997-004 91 <br /> DS-2(3.5) 59900997-005 90 <br /> PL-1(3.5) S9900997-006 96 <br /> Method Blank S990331-SBI 87 <br /> i <br /> CAS Acceptance Limits: 41-140 <br /> • <br /> SUR V020597p <br />