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v Equipment Cleaning Sample bottles, caps, and septa used in sampling for volatile and seiruvolatile organics were triple rinsed with high-punty deionized water After being rinsed, sample bottles were dried overnight at a temperature of 200°C Sample caps and septa were dried overnight at a temperature of 60°C Sample bottles, caps, and septa were protected from solvent contact between drying and actual use at the sampling site Sampling containers were used only once and discarded after analysis was complete Plastic bottles and caps used in sampling for metals were soaked overnight in a 1 percent nitric acid solution Next, the bottles and caps were triple rinsed with deionized water Finally, the bottles and caps were air dried before being used at the site Plastic bottles and caps were constructed of linear polyethylene or polypropylene Sampling containers were used only once and discarded after analysis was complete Before the sampling event was begun, equipment that was to be placed in the well or would come in contact with groundwater was disassembled and cleaned thoroughly with detergent water, and then steam cleaned with deionized water Any parts that could have absorbed contaminants, such as plastic pump valves, etc , were cleaned as described above, or replaced If a positive displacement (bladder) pump is used the inside surfaces of the pump tubing were cleaned by heating the tubing overnight at 120°C with a low-flow, inert air source Once the bladder pump was cleaned and reassembled, a pump blank was obtained by pumping organic-free water through the bladder pump assembly The pump effluent was sampled and analyzed by EPA Method 601 or EPA Method 602 The pump effluent analysis results had to have registered below the method reporting limit for each parameter before the pump was taken to the site for use During field sampling, equipment surfaces that were placed in the well or contacted groundwater were steam cleaned with deionized water before the next well was purged or sampled Water-level, Floating Hydrocarbon, and Total Well-depth Measurements Before purging and sampling occurred,the depth to water,floating hydrocarbon thickness, and the total well depth were measured using an interface measuring system The oil/water interface measuring system consisted of a probe that emitted a continuous audible tone when immersed in a nonconductive fluid, such as oil or gasoline, and an intermittent tone when immersed in a conductive fluid, such as water The floating hydrocarbon thickness and water level were measured by lowering the probe into the well Liquid levels were recorded relative to the tone emitted at the groundwater surface The sonic probe was decontaminated by being rinsed with deionized water or steam cleaned after each use Alternatively, an electric sounder and a bottom-filling Teflon® bailer may have been used to record floating hydrocarbon thickness and depth to water The electric sounder is a transistorized instrument that uses a reel-mounted, two-conductor, coaxial cable that connects the control panel to the sensor Cable markings are stamped at 1-foot intervals The water level was measured by lowering the sensor into SAC/pi2\252[1\25201000 las 94 INs 3 A-2 Rev 0 07/27/94