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4� The water samples were transferred into two sterilized, glass, 40 ml VOA sample containers and a 500 ml amber glass bottle. The samples were immediately sealed in the field with i Teflon-lined threaded caps ensuring an airtight seal. The samples were labeled appropriately in the field. Labels included: sample location, depth, date, time, job number, and field identification number. Samples were placed immediately in an insulated storage container cooled with chemical ice. The temperature inside the storage container was maintained at or below 4° Celsius (39.2° Fahrenheit) and monitored with a thermometer to ensure that the temperature remained constant. The storage container also included a laboratory-prepared travel blank for quality i control purposes and as an indicator of cross contamination. The travel blank was placed with the sample containers and analyzed if the field samples indicated detectable levels of fuel constituents. A chain of custody record accompanied the samples. Chain of custody records included: sample location, depth, date, time, job number, field identification number, temperature of sample container,analysis required and personnel collecting samples. Water samples were delivered to a State certified hazardous waste laboratory within approximately 4 days of collection. The temperature was maintained at 4° Celsius (39.2° Fahrenheit) in the insulated storage container prior to delivery to the laboratory. Once the samples were delivered to the laboratory, the chain of custody was signed by the laboratory i indicating that the possession of the samples had changed. The water samples were analyzed within the required 7-day period following collection. Well purging equipment was pre-cleaned by steam prior to each purging interval. Decontamination of sampling bailers is achieved by using a different dedicated, disposable bailer for each sample.