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2 . 2 METHOD SPECIFIC SAMPLING INSTFZUCTIONS TO-17 Sampling Instructions Application: Soil Gas Media: TO-17 tube, 1/4"Teflon tubing, 1/4"Tygon tubing, 1/4" to 1/4"Union, 1/4"fittings with ferrules, a sample pump and a low flow holder mayb required if using a higher flow pump Typical Sampling Parameters: Sample Flow Rate = m 0mL/min Total Vol. = 200 L Du- ration = 4 rain. These parameters may change depen ~ g on project objectives. "'" I Sam Ve Flow Tygon Tubing to Pum} Teflon Tubing'to 861 Gas Probe 22- - r4 - - Sorbent Tube Ring Indicates Sample Inlet Union I Instructions: 1) In order to calibrate the pwnp use a"set=up" tube, sing the Tygon tubing connect the sam- pling pump to the outlet of the's-066 t tube;if us'ing a higher flow pump a low flow holder may be necessary to lower the flow rate,then connec the inlet(the ringed side) to the calibra- tor.Adjust setting to desired flow rate and record. 2) Replace the "set-up" tube with a sample tube. Again using the Tygon tubing connect the sampling pump to the outlet of the sample tube. Attach the inlet to the union fitting using a Swagelok nut. Using a 9/16" wrench on the nut an a 7/16" wrench on the union, tighten the nut. In the same manner, attach the union to the Swagelok nut on the soil gas probe tub- ing.DO NOT OVERTIGHTEN. 3) Start the sample pump and record the start time.A ter the desired duration, stop the pump and record the end time. 4) Replace the end plugs on both ends of the sample tabe. Record the sample ID,.tube ID and the collection date/time on the COC. ` f 5) When completed with a set of samples, re-attach the "set-up" tube to the calibrator and measure the post-sampling flow. Record post-sampling flow rate. This should match within 10%of the pre-sample flow rate. 6) Record sample volume on the COC using the averse of the pre- and post- flow rates. a. � 'x 7) Send tubes to the lab in the cooler with ice. rpm's Za ti