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' KLEIN FELDER <br /> 2 The water level probe is decontaminated in a tnsodium phosphate wash, followed <br />' by a distilled water rinse, prior to use in each well <br /> 3 Water Ievel measurements are made using a conductivity-based water-level meter <br />' Depth-to-water is generally measured from a surveyed mark on the north nm of the <br /> PVC well casing <br />' The water level measurements are converted to elevations using the surveyed casing <br /> elevations <br /> 1 <br /> A4.2 Groundwater Sampling <br /> Groundwater samples are collected from the monitoring wells at the site The sampling <br /> protocol for each well is as follows <br />' l Down-well equipment (pum s, bailers etc ) is decontaminated by steam cleaning, <br /> or by scrubbing in a tnsodium-phosphate wash followed by a distilled water rinse, <br />' prior to use in each well Bailer cord is replaced prior to use in each well <br /> 2 The depth-to-water is measured using a conductivity-based water-level meter <br /> 3 The volume of water standing in the well is calculated by subtracting the depth-to- <br /> water measurement from the depth of the well and multiplying by the appropriate <br /> conversion factor{3 14 *radius2) <br /> 4 Three to five well volumes of water are purged from each well using a submersible <br />' <br /> pump, bladder pump, or Teflon bailer <br /> t5 Physical parameters (pH, electrical conductivity, and temperature) are monitored <br /> for stability during purging The physical parameter measurements are recorded on <br /> purge-and-sample logs, along with the time and volume of water purged at each <br />' measurement <br />' 6 Samples are collected with a disposable bailer or bladder pump 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 immediately labeled and placed in an iced sample container At the <br /> end of the day, the samples are delivered to the analytical laboratory under chain- <br /> of-custody <br /> hain- <br /> ofcustody control Sample handling is described in more detain in Section A-2 4 <br /> DH and 7x94 Page v of v <br /> Copyright 1994, Kleinfelder Inc <br />