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Sample Collection, Preservation, and Handling After purging,a new polyethylene disposable bailer will be used to collect samples for analysis The bailer is attached to a new disposable rope and lowered slowly into the water to avoid agitation of the collected sample Containers for volatile organic analyses will be filled completely so that no airspace remains in the vial after sealing All sample containers will be prewashed and prepared at the analyzing laboratory in accordance with quality assurance/quality control protocols of the laboratory Only sample containers appropriate for the intended analyses will be used Conductivity, Temperature, and pH Specific conductance,water temperature,and pH measurements will be made when a water sample is collected Regardless of the sample collection method, a representative water sample will be placed in a transfer bottle used solely for field parameter determinations A conventional pH meter with a combination electrode or equivalent will be used for field-specific conductance measurements Temperature measurements will be performed using standard thermometers or equivalent temperature meters Combination instruments capable of measuring two or all three of the parameters may also be used All instruments will be calibrated in accordance with manufacturer methods All probes will be thoroughly cleaned and rinsed with fresh water prior to any measurements Sample Custody Sample quantities, types,and locations will be determined before the actual fieldwork commences As few people as possible will handle the samples The field sampler is personally responsible for the care and custody o the collected samples until they are properly transferred Each sample will be labeled and sealed properly immediately alter collection Sample identification documents will be carefully prepared so that identification and chain-of-custody records can be maintained and sample disposition can be controlled Each label will contain the following information • Name of collector • Project number • Date and time of collection • Place of collection • Well number or identification • Preservative(if any) A chain of custody record will be filled out for and will accompany every sample and every shipment of samples to the analytical laboratories in order to establish the documentation necessary to trace sample possession from the time of collection The record will contain the following information • Project number • Signature of collector,sampler,or recorder • Date and time of collection • Place of collection • Sample type • Signatures of persons involved in the chain of possession • Inclusive dates of possession