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Well Purging Before sampling occurred, a polyvinyl chloride (PVC) bailer, centrifugal pump, low-flaw submersible pump, or Teflon bailer was ipurge wells weregwater in the pu purged according to the g and gravel pack from the monitoring well Monitoring protocol presented in Figure A-1 In most monitoring wells, the amount of water purged before sampling was greater than or equal a�ethremoving fewerlthan three casing volumees Some monitoring s were expected to be evacuated to dryness g These low-yield monitoring wells were allowed to recharge for up to 24 hours Samples were obtained as soon as the monitoring�ll��hou s the moned to a itoring ring well wasvel sufficient oreco�rdeld collection If insufficient water recharged as dry for the sampling event Groundwater purged from the monitoring wells was transported in a 500-gallon water trailer, 55-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. Thes,Hspecific conductance, and temperature meter were calibrated each day before P l� field activities were begun The calibrationsation was checked were recorded on once each the WaterdSample Field Data y to verify meter performance Field meter caL Sheet Well Sampling A Teflon bailer was the only equipment acceptable for well sampling When samples for volatile organic analysis were being anaected, the flow aeration Glassfgrounwater bottles of atfrom least 4pbmilliiiters ailer was regulated to minimize turbulence 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 bottle was compleA�i ll A convex Teflon sethe bottle was appedptit was inverted was placed over the positive meniscus to eliminate air , and tapped to verify that it contained no air 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 disposableea re 5 o nt, and the vessel was sealed c copolymer filter was threaded onto the transfer vessel at g p A-3 xcY o,1112M5 SACIN\p1pg0805\M5t460 3CS-451pas t