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i <br /> v hn KLEINFELDER i <br /> i <br /> I <br /> AA4 GROUNDWATER MONITORING <br /> A-4.1 Water Level Measurements <br /> Water level measurements are made in the wells prior to purging and sampling the wells. <br /> Measurement protocol is as :follows: <br /> 1. The wells are opened and allowed to equilibrate with the atmosphere. <br /> 2. The water level probe is decontaminated in a trisodium phosphate wash, followed by a <br /> distilled water rinse, prior to usu in each Well. <br /> 3. Water level measurements are made using aconductivity-based water-level meter. <br /> Depth-to-\Tater is generally measured from a surveyed mark on the north rim of the <br /> PVC well casing. <br /> The water level measurements are converted to elevations using the surveyed casing elevations. <br /> A-4.2 Groundwater Sampling <br /> Groundwater samples are collected from the monitoring wells at the site. The sampling protocol <br /> for each well is as lbllows: <br /> I. Dowd-well equipment (pumps, bailers, etc.) is decontaminated by steam cleaning, or by <br /> scrubbing in a trisodiuri-pliospbatc wash followed by a distilled water rinse, prior to use <br /> in each well. 13ailer corcl is rep.laccd prior to Llse in each well. <br /> i <br /> I <br /> 2. The depth-to-Nvater is measured using a coaiductivity-based water-level meter. <br /> 3. The volume of water standing in the wellJs calculated by subtracting the depth-to-water <br /> measurement fi-om the depth of the well and multiplying by the appropriate conversion <br /> factor{i.14 *radius'). <br /> 'i <br /> 4. Three to live well volumes of water are purged fron-► each well using a submersible <br /> pump, bladder bump, or Te:l:lon bailer. <br /> i <br /> I <br /> I <br /> 20-Y138-124120181'1 211120 18C270 Pugs A-5 <br /> Q 1998. Kleinldder. Inc. .lune 16. 1998 <br /> I <br />