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is, two consecutive sets of similar field measurements will be ob- <br />tained. Purged water is stabilized when (1) the pH is within ±0.1 pH <br />units, (2) specific conductance is within ±5 percent, or (3) tempera- <br />ture is within ±1.0°F. All records of the above data will be kept on <br />a field data sheet. Figure A-1 shows an example of the Water Sample <br />Field Data Sheet. Copies of the field data sheets will be subjected <br />to review by the sampling supervisor upon completion of the.sampling <br />event. The pH, specific conductance, and temperature meter will be <br />calibrated daily prior to initiating field activities. The calibra- <br />tion will be checked once each day to verify meter performance. <br />Samples will be collected after the calculated purge volume has been <br />removed and the pH, conductance, and temperature have stabilized. <br />With as little interruption in pumping rates as possible, the bladder <br />pump effluent will be directed into appropriate containers. The pump <br />AdIbL <br />flow will be regulated when collecting samples for volatile organic <br />analysis. The flow will be set to approximately 100 milliliters per <br />minute to minimize turbulence and aeration of the pump effluent. <br />Sample bottles for volatile organics analysis will be filled complete- <br />ly to prevent any air from remaining in the bottle. A positive menis- <br />cus forms when the bottle is completely full. A convex, Teflon -lined <br />septum will be placed over the positive meniscus to seal the contain- <br />er. After capping, the bottle will be inverted and tapped to check <br />that no air bubbles are present. <br />All samples will be collected in duplicate. The sample containers for <br />other parameters will be filled, preserved as required, and capped. <br />Samples for metals analysis will be filtered in the field prior to <br />preservation with nitric acid. Filters will be discarded after each <br />use. <br />. . 9390207.00D AN <br />