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KLEINFELDER B-4.2 Groundwatcr Sampling Groundwater samples are collected from the monitoring wells at the site. The sampling protocol for each well is as 1611ows: 1. Down-.yell equipment (pumps, bailers, etc.) is decontaminated by steam cleaning, or by scrubbing in a trisodium-phosphate or rton-phosphate detergent wash followed by a R distilled water rinse,. prior to iIse ill each well. Bailer cord is replaced prior to use in each well. 2. The depth to -roundwatcr is measured usitt4(' a conductivity-based water-level meter. { 3. The volume of water in gallons stat}dine in the well is calculated by subtracting the depth to groundwater measurement from the depth of the well and multiplying by the appropriate co.nversimi factor (0.16 for 2-irlch wells, and 0.65 for 4-inch wells). 4. Three to rive well volumes of.vater are purged frons each well using a submersible pump, bladder pump, or Telloo bailer. 5. Physical parameters (pH, electrical conductivity, and temperature) are monitored for stability while pi.n-4,ing. fic pliysical parameter measurements are recorded on purge- , and-sample loss; a.lort`u with the time and volume of water purged at each measurement. 6. Samples are collected with a disposable bailer or bladder pump into appropriately prepared bottles provided by the analytical laboratory. 7. Samples for metals analysis are usually filtered in the field at the time of collection. 8. Samples arc immediately labeled and placed in an iced sample container. At the end of the day- the samples are delivered to the analytical laboratory under chain-of custody control. 13-5 Vadose Zone tMonitorin 1. Prior to conducting lysimeter sampling, the pressure-vacuum equipment is checked and cleaned- A Soil-Moisture ]land pump with a pressure-vacuum gage is used to measure residual and implied pressure-vacuum. Nitrogen gas is used to purge the lysimeter system for sampling. Ail ail- punnp is available as a back up. 2. Approximately one \vee.k. to one month prior to conducting the sampling, the residual pressures at the air-line of each lysimeter are treasured ad the vacuums reset to manufactured recommended value (usually 50 centibars). The measurements and applied vacuums are noted on a sampling lou form. Kleinfelder has found that resetting the lysinieters vacuums before the sampling yields good sample recovery. 20-2864-02.L03/2019RO;2 Page 8-6 ��rrr Copyright 1998. IUcinlbl(lcr. Inc. January 14, 1999