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•COLUMBIA ANALYTICAL SERVICES# <br /> QA/QC Report <br /> Client: Groundworks Environmental,Inc. Service Request: 59801124 <br /> Prgject: Crossroads Center/AE5701 Date Collected: NA <br /> Sample Matrix: Water 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-Tnfluorotoluene <br /> DWD-1 59801124-001 93 91 <br /> Method Blank 5980506-WB1 107 85 <br /> CAS Acceptance Limits: 69-116 69-116 <br /> SUR2/020397p <br /> Page 8 <br />