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r <br /> CGROiI) WATISAMPLiI`YG <br /> To collect a representative sample of the groundwater, stagnant water within the yell casing <br /> and filter material roust be purged and fresh aquifer water allowed to replace it. 'file water is <br /> purged from the well by pumping or bailing at least th.-ee well volumes. Well volumes are <br /> calculated by measuring depth to groundwater to the nearest 0.01 foot upon arrival at the well <br /> before any purging has begun. Groundwater samples are collected only after purging has <br /> been of sufficient duration for pH, temperature, and electrical conductivity to stabilize. Wien <br /> purging low-yield wells,the wells are purged to dryness. When the swell recovers to 80% of <br /> the depth measured upon arrival, samples are collected. <br /> Field sampling logs maintained for each well include: <br /> ■ Monitoring well identification <br /> ® Static water level,before and after pumping <br /> Well depth <br /> 0 Condition of water prior to purging(e.g., amount of free product) <br /> b Purge rate and volume <br /> ■ pK temperature, and conductivity during purging <br /> a Time purged <br /> a Time of sample collection <br /> H Sampling method <br /> ■ Name of sampler <br /> Climatic conditions <br /> Water samples are collected using cleats teflon bailers. All equipment that contacts samples is <br /> thoroughly cleaned before arrival at tine site and between sampling events. <br /> Water is ll in dean laboratory-supplied containers,labeled,placed immediately into an <br /> ice Chest pre46 d to 4°C,and transported to Clayton's laboratory for analysis. One trip <br /> blank wrll be furnished in accordance with our quality assurance/quality control(QAAK) <br /> Pry <br /> All samples are collected in such a manner so as to minim the volatrlization of a sample <br /> due to agitation and/or um*r from barter to sample container. Samples are collected so <br /> ham, that contaminants most sensitive to volatilization are sampled first. <br />