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u r MIP I:rtt,ironme»tal Consultants, Irtc. Sampling Protocols Page: 4 well, sampling point, and at the end of the sampling day. De-iui:ized or organic- free water (also provided by the laboratory) will then be introduced into the pump or bailer as a Final stage of cleaning. This water will then bE- pumped or gently poured into sample vials to be used as pump or bailer blanks. These blanks will be tested only if their corresponding samples are found to contain contaminants. immediately prior to sampling, water levels and well depth measurements will be taken in all wells at the site. Each well will be evacuated using a stainless steel bladder pump, which does not introduce air into the water column, or a Teflon bailer. The pH, temperature, and electrical conductivity of the water will be moni- tored as the well is evacuated. These parameters will be noted on a field log. Instruments calibrated to known standards will be used to monitor these parameters. At least five (5) well volumes will be evacuated from each well and more if necessary until the above parameters have stabilized. Wells that are de-watered before evacuation of five (5) well volumes has been accomplished will be sampled upon 80 percent recovery of the initial water level. The wells or other sampling points will be sampled in order of the least to the most contaminated, as best known or estimated. The samples will be pumped from a stainless steel bladder pump or carefully poured from a Teflon bailer into clean glass vials with Teflon-lined screw caps and half gallon plastic containers provided by the laboratory. Care will be taken to ensure that no,-;r space exists in the vials by inverting to check for bubbles and re-sampling, if necessary. The samples will be analyzed or extracted within 14 days according to their EPA methods. Water samples collected for analysis will be analyzed by EFA method 624 for purgeable organics in water.