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2• Upon arriving at the sample station, the neoprene rubber ends of the sample in, are <br /> checked for dirt and dust acxttmulation If accessary, the sample-lines are flushed <br /> with <br /> I distilled water. <br /> 3. The pressurehracuum line is connected to the vacuum gage of the vacuum }lanapump. <br /> The clamp on the vacuum fine it opened and the residual vacuum.rem,a g. on the. <br /> lysimeter unit is measured-and recorded on the lysimeter sampling log. <br /> 4• The pressure/vacuum lin,is connected Wthe pressure pump and the discharge (sample) <br /> line opened. The discharge line is inserted into a-clean,tinpreserved I liter plastic bottle <br /> prepared and supplied by the analytical laboratory. ' <br /> 5-- The pressure pump is activated, forcing air into-the lysimeter. if additional pressure.is <br /> needed to retrieve the fluid more quickly,the pressure is increased until adequate flow is <br /> achieved- <br /> 6. The sample is split to other appropriately preserved bottles as necessaU-for the analytical <br /> requirements_ The samples are placed in an ice-filled chest to maintain a temperatme of <br /> approximately 4 degrees Celsius during delivery to the laboratory under chaia-of- <br /> eustody <br /> Procedures. <br /> 7- After the sample is collected, the. ly " eter vacuum-is reset (evacuated) to the <br /> manufactured recommended value using a'hand vadum pump- At this time,'the <br /> Iysirneter is tested to evaluate potential leaks that could cause vacuum pressure Ion The <br /> pressuzre/vacuum line is then clamped and the lysimeter secured- <br /> 23-483 849-Fo I\ <br /> ecured-23-4&3&49-FdI\3IoR325 A-13 July 14,1000 <br /> CoPYri&2000 rJeWdder.br- <br />