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to a viton vacuum diaphragm pump and the tubing:; is evacuated of all the ambient air that <br /> may have entered the line Then it begins to purge the soil gas and or vapors that are <br /> present it this depth Upon monitoring the pumping rate of the vacuum pump and <br /> measuring the air temperature with a in-line digital thermometer, a calibrated Thermodyne <br /> 580B Photo Ionization Detector is connected to the auxiliary output }port of the pump and <br /> the readings encountered are logged. <br /> E) Capon completing the measurements of the soil gas at the prescribed depth, the <br /> surface equipment is disconnected and the soil gas probe with it's cxtcnsions ate <br /> i em oved <br /> F) The next task is decontamination of all the extension rods and the soil gas vapor <br /> probe This i_s completed by washing the rods and probe with a al(.onox nun-phosphoric <br /> detergent and then steam cleaning all the pieces Between each sampling point new teflon <br /> tubing is used and the old tubing is discarded appropnately <br /> G) The soil gas vapor hole that remains after the tads have been removed is then filled with <br /> a wet neat cement slurry through a tunnel The cement is agitated with a long steel rod <br /> to assist the material down the entire length of the hole <br /> H) At this point, we arc ready to begin our next vapor point and take another measurement <br /> laid operating procedure followed when we ate ..om <br /> The fallowing is the stars p l3 leting these type p p <br /> of tasks It you have any additional questions , please call my office and 1 will assist <br /> Sincerely, <br /> Donald E Light <br /> TOTAL P 03 <br /> - --------------- ----------- -------- -- -- - - ---- ----- ---- <br />