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kTj KLEIN FELDER 3 The volume of water standing in the well is calculated by subtracting the depth-to-water measurement from the depth of the well and multiplying by the appropriate conversion factor(3 14 *radius 2) 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 8 Samples are 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 Sample handling is described in more detain in Section A-2 4 • A-5 0 COLLECTION HYDROPUNCH 0 GROUNDWMER,SA,1 PLES One-time groundwater samples are collected using a Hydropunch IIe, which is an in situ groundwater sampling device The borings will be advanced to a depth equivalent to the bottom of the capillary fringe A stainless steel drive tip equipped with a filter is lowered into the borings at the end of a 2 5-mch diameter galvanized steel pipe and pushed using the drill rig approximately 3 to 5 feet into the soil/aquifer formation at the bottom of the boring A thoroughly decontaminated bailer can then be lowered down the center of the Hydropunch II® casing to obtain a sample of groundwater (which has entered the Hydropunch II® due to hydrostatic pressure) To reduce the potential of introducing contaminants into the samples, the drive tip, galvanized pipe, and other equipment used for sample collection are steam cleaned and/or washed with trisodium phosphate (TSP) solution and rinsed with distilled water prior to use The sample tips and filters are not retrievable New O-rings,tips, and screens are used for each sample ETH and WC/94 Copyright 1994 Kleinfelder Inc Page 5 of 5