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Y <br /> ATTACHMENT 4 <br /> SOIL VENT SYSTEM OPERATION DATA <br /> JUNE 1993 - APRIL 1994 <br /> SOIL VENT SYSTEM <br /> System Operation Data Spreadsheet <br /> Example TPH Extraction Calculation <br /> Soil Vapor Analytical Results <br /> Cumulative TPHg Extraction Estimate (Graph) <br /> Laboratory Reports and Chain of Custody Forms <br /> Vapor Sampling "Tedlar" Bag Sampling Technique <br /> i <br /> • <br />