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The pH, specific conductance, temperature, turbidity, and dissolved oxy- <br /> gen meters will be calibrated each day before field activities begin The <br /> calibration will be checked once each day to verify meter performance <br /> Field meter calibrations will be recorded on the Water Sample Field Data <br /> ' Sheet <br /> ' Well Sampling <br /> A Teflon bailer will be the only equipment acceptable for well sampling <br /> When samples for volatile organic analysis are being collected, the flow of <br /> ground water from the bailer will be regulated to minimize turbulence and <br /> aeration Glass bottles of at least 40-milliliters volume and fitted with <br /> ' Teflon-lined septa will be used in sampling for volatile organics These <br /> bottles will be filled completely to prevent air from remaining in the bottle <br /> A positive meniscus forms when the bottle is completely full A convex <br /> ' Teflon septum will be placed over the positive meniscus to eliminate air <br /> After the bottle is capped, it is inverted and tapped to verify that it contains <br /> no air bubbles The sample containers for other parameters will be filled, <br /> filtered as required, and capped <br /> When required, dissolved concentrations of metals will be determined <br /> using appropriate field filtration techniques Samples will be filtered by <br /> emptying the contents of the Teflon bailer into a pressure transfer vessel <br /> A disposable 0 45-micron acrylic copolymer filter will be threaded onto the <br /> transfer vessel at the discharge point, and the vessel will be sealed Pres- <br /> sure will be applied to the vessel with a hand pump and the filtrata_will be <br /> ' directed into the appropriate containers Each filter will be used once and <br /> discarded. <br />' Sample Preservation and Handling <br /> The following section specifies sample containers, preservation methods, <br />' and sample handling procedures <br /> Sample Containers and Preservation <br />' Sample containers vary with each type of analytical parameter Container <br /> types and materials will be selected to be nonreactive with the particular <br />' analytical parameter tested. <br />' PRA P91 K022 AOW Rev 0 February 7, 1992 <br />