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KLEINFELDER A-5 1 WATER LEVEL MEASUREMENTS Water level measurements are made in the wells prior to purging and sampling the wells Measurement protocol is as follows 1 The wells are opened and allowed toe equilibrate with the q atmosphere 2 The water level probe is decontaminated in a trisodium phosphate wash, followed by a distilled water rinse, prior to use in each well 3 Water level measurements are made using a conductivity-based water-level meter Depth-to-water is generally measured from a surveyed mark on the north rim of the PVC well casing The water level measurements are converted to groundwater elevations using the surveyed casing elevations A-5 2 GROUNDWATER SAMPLING Groundwater samples are e collected from the monitoring wells at the site The sampling protocol for each well is as follows 1 Down-well equipment (pumps, bailers, etc ) is decontaminated by steam cleaning, or by scrubbing in a trisodium-phosphate wash followed by a distilled water rinse, ■ prior to use in each well Bailer cord is replaced prior to use in each well 2 The depth-to-water is measured using a conductivity-based water-level meter 3 The volume of water standing in the well was calculated by subtracting the depth- to-water measurement from the depth of the well and multiplying by the appropriate conversion factor (3 14*radius2, 0 16 for 2-inch wells, and 0 65 for 4- inch wells) 4 Three to five well volumes of water are purged from each well using a submersible pump, bladder pump, or Teflon bailer 5 Physical parameters (pH, electrical conductivity, and temperature) are monitored for stability during purging The physical parameter measurements are recorded on purge-and-sample logs, along 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 23-482276-BOO/CR96S276 A-7 October 17, 1996 Copyright 1996 Klemfelder Inc