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' kn KLEIN FELDER 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 1 well casing ' The water level measurements are converted to elevations using the surveyed casing elevations A-4.2 Groundwater Sampling ' Groundwater samples are 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 or non-phosphate detergent 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 groundwater is measured using a conductivity-based water-level meter 3 The volume of water in gallons standing in the well is calculated by subtracting the depth to groundwater measurement from the depth of the well and multiplying by the ' appropriate conversion factor(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 while 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 8 Samples are immediately labeled and placed in an iced sample container At the end of the tday, the samples are delivered to the analytical laboratory under chain-of-custody control 28699 E01 /STO3R627 Page A-7 Copyrtght 2003,Klemfelder,Inc Apn1 22,2003