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- f <br /> wlll'Isnvironmenfal Consullant.+, Inc. <br /> Sampling PrOWC01 <br /> Page: 4 <br /> lab. This travel blank should be listed on the Chain of Custody but will be <br /> analyzed only if all samples contain the same contaminants. <br /> All sampling equipment including the pump, bailer, and cables, used by <br /> sampling personnel, will be disassembled, if appropriate, and steam-cleaned <br /> prior to commencement of sampling. These procedures will also be followed <br /> between each well, sampling point, and at the end of the sampling day. De- <br /> ionized or organic-free water(also provided by the laboratory) will then be <br /> introduced into the pump or bailer as a final stage of cleaning. This water will <br /> then be pumped or gently poured into sample vials to be used as pump or bailer <br /> blanks. These blanks will be tested only if their corresponding samples are <br /> found to contain contaminants. <br /> Immediately prior to sampling, water levels and well depth measurements will <br /> be taken in all wells at the site. Each well will be evacuated using a stainless <br /> steel bladder pump, which does not introduce air into the water column, or a <br /> Teflon bailer. The pH, temperature, and electrical condu:.tivity of the water i <br /> will be monitored as the well is evacuated. These parameters will be noted on a <br /> field log. Instruments calibrated to known standards will be used to monitor <br /> these parameters. At least 5 well volumes will be evacuated from each well, <br /> and more, if necessary, until the above parameters have stabilized. Wells that <br /> are de-watered before evacuation of 5 well volumes has been accomplished will <br /> be sampled upon 80 percent recovery of the initial water level. The wells or <br /> other sampling points will be sampled in order of the least to the most <br /> contaminated, as best known or estimated. The samples will be pumped from a <br /> stainless steel bladder pump or carefully poured from a Teflon bailer into clean <br /> glass vials with Teflon-lined screw caps and half gallon plastic containers <br /> provided by the laboratory. Care will be taken to ensure that no air space exists <br /> in the vials by inverting to check for bubbles and re-sampling if necessary. The <br /> samples will be analyzed or extracted within 14 days according to their EPA <br /> lected <br /> or analysis <br /> l be analyzed by EPA method <br /> methods.urgater samples eable aromaticsla d hall <br /> ocarbons, andtotal petroleum hydrocarbons, <br /> 602 for p g <br /> as referenced in Solid Waste Method SW 846• <br />