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Plastic bottles and caps used in sampling, for <_eneral water quality parameters are not routinely washed. They ;Ire used only once and discarded after analysis is complete. Before starting the sampling event, all equipment that will be placed in the well or come in contact with groundwater will be disassembled and cleaned thoroughly with detergent water, and then steam cleaned with deionlzed water. Any pans that may absorb contaminants, such as plastic ncllnp valves, bladders. etc., will be cleaned as described above or replaced. The inside surfaces of the positive displacement (bladder) pump tubing will be cleaned by heating the tubing overnight at 120 degrees Celsius with a low-flow, inert air source. Once the bladder pump is cleaned and reassembled, a pump blank will be obtained by pumping organic-free water throt11-111 the bladder pump assembly. The pump effluent will be sampled and analyzed by EPA NIethod 601. The pump effluent analysis results must be below the method reporting limit for each parameter before the pump is taken to the site for use. During field sampling, all equipment surfaces that are placed in the well or contact groundwater will be steam cleaned with deionized water before purging or sampling the next well. Well Purging Before sampling, standing water in the casing and gravel pack xvill be purged from the monitoring well using a bladder pump, pneumatic displacement pump, centrifugal pump, or Teflon® bailer. In most monitoring wells, the amount of water pureed before sampling will be equal to or greater than four casing volumes. Some monitoring wells are expected to be evacuated to dryness after the removal of less than four casing volumes. These low-yield monitoring wells will be allowed to recharge for LIP to 24 hours. Samples will be taken as soon as the monitoring wells have recharged to a level sufficient for sample collection. If insufficient water has recharged after 24 hours, the monitoring well will be recorded as dry for the sampling event. All field measurements will be recorded in at waterproof field logbook. Figure A-1 shows an example of the Miter Sample Field Data Sheet on which field data are recorded. Field data sheets will be reviewed by the sampling coordinator after the sampling event is completed. The pH, specific conductance. and temperature meter will be calibrated each day before beginning field activities. The calibration will be checked once each day to verify meter performance. FRDSample.arc-93/jes:U A-3 Rev.0.0621/95