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These low-yield monitoring wells were allowed to recharge for up to ' 24 hours. Samples were obtained as soon as the monitoring wells recharged to a level sufficient for sample collection. If insufficient water recharged after 24 hours, the monitoring well was recorded as dry for the sampling event. Field measurements were recorded in a water-resistant field logbook. Figure D-2 shows an example of the Water Sample Field Data Sheet on ' which field data are recorded. Field data sheets were reviewed for completeness by the sampling coordinator after the sampling event was ' completed. The pH, specific conductance, and temperature meter were calibrated each day before field activities were begun. The calibration was checked once ' each day to verify meter performance. ' Well Sampling A Teflon bailer was the only equipment acceptable for well sampling. When samples for TPHG were being collected, the bailer effluent was slowly ' poured at approximately 100 milliliters per minute to minimize turbulence and aeration. Glass bottles of at least 40-milliliters volume and fitted with Teflon-lined septa were used in sampling for TPHG. These bottles were filled completely to prevent air from remaining in the bottle. A positive meniscus formed when the bottle was completely full. A convex Teflon ' septum was placed over the positive meniscus to eliminate air. After the bottle was capped, it was inverted and tapped to verify that it contained no air bubbles. The sample containers for other parameters were filled, filtered ' as required, and capped. Sample Preservation and Handling The following section specifies sample containers, preservation methods, and sample handling procedures. ' Sample Containers and Preservation ' Sample containers vary with each type of analytical parameter. Container types and materials were selected to be nonreactive with the particular analytical parameter tested. pjO\Of9O\Of900020.1 ag D - 4 Rev. 0 December 15, 1992