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G <br />Aft a <br />KLEINFELDER <br />A-4.2 Groundwater Sampling <br />Groundwater samples are collected froin the monitoring wells at the site. The sampling protocol <br />for each well is as follows: <br />1. Down -well equipment (pumps, bailers, etc.) is decontaminated by steam cleaning, or by <br />scrubbing in a trisodium-phosphate or non -phosphate detergent wash followed by a <br />distilled water rinse, prior to use in each well. Bailer cord is replaced prior to use in each <br />well. <br />'r is measured using a conductivity -based water -level meter. <br />2. The depth to groundwater g y <br />3. The volume of water in ualloils standing in the well is calculated by subtracting the depth <br />to groundwater measurement from the depth of the well and multiplying by the <br />appropriate conversion tactor (0.16 for 2 -inch wells, and 0.65 for 4 -inch wells). <br />4. Three to five well volumes of water are purged from each well using a submersible pump, <br />bladder pump, or Teflon bailer. <br />5. Physical parameters (I)II. electrical conductivity, and temperature) are monitored for <br />stability while purging. The physical parameter measurements are recorded on purge - <br />and -sample logs, along Nvith the time and volume of water purged at each measurement. <br />6. Samples are collected \v ith a disposable bailer or bladder pu np into appropriately <br />prepared bottles provided by the analytical laboratory. <br />7. Samples for metals analysis are usually filtered in the field at the time of collection. <br />8. Samples are nnmediately labeled and placed in an iced sample container. At the end of the <br />day, the samples are delivered to the analytical laboratory under chain -of -custody control. <br />20-3978-03. W36/2019766 Page n-7 <br />© 1999. Kleinfelder. Inc September 9. 1999 <br />