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i+ x' IWroundwater purged from the monitoring wells was transported in a 500-gallon water trailer, -gallon drum, or a 325-gallon truck-mounted tank, to EMCON's San Jose or Sacramento office location for temporary storage EMCON arranged for transport and disposal of the purged groundwater through Integrated Waste Stream Management, Inc Field measurements of pH, specific conductance and temperature were recorded in a waterproof field logbook Figure A-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 Field meter calibrations were recorded on the Water Sample Field Data Sheet Well Sampling A Teflon bailer was the only equipment acceptable for well sampling When samples for volatile organic analysis were being collected, the flow of groundwater from the bailer was regulated to mininize turbulence and aeration Glass bottles of at least 40-milliliters volume and fitted with Teflon-lined septa were used in sampling for volatile organics These bottles were filled completely to prevent air from remaining in the bottle A positive meniscus formed when the ttle was completely full A convex Teflon septum was placed over the positive meniscus to rrunate air After the bottle was capped, it was inverted and tapped to verify that it contained no aur bubbles The sample containers for other parameters were filled, filtered as required, and capped When required, dissolved concentrations of metals were determined using appropriate field filtration techniques The sample was filtered by emptying the contents of the Teflon bailer into a pressure transfer vessel A disposable 0 45-nucron acrylic copolymer filter was threaded onto the transfer vessel at the discharge point, and the vessel was sealed Pressure was applied to the vessel with a hand pump and the filtrate directed into the appropriate containers Each filter was used once and discarded Sample Preservation and Handling The following section specifies sample containers, preservation methods, and sample handling procedures i Sample Containers and Preservation Sample containers vary with each type of analytical parameter Container types and matenals were �lected to be nonreactive with the particular analytical parameter tested