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In the case of the nonwdedicated pump, it is lowered into the well and then activate <br /> (power from the controller box is regulated which controls the discharge rate of the <br /> centrifugal purge pump). In the case of a well with a dedicated pump, the pneumatic <br /> controller box is connected to the dedicated pump (some wells have special high-rate <br /> purge pumps used only for purguig, these can be identified by the fittings'on the cap). A <br /> dedicated discharge tube (kept locked at the well head in a protective .bag) is then <br /> attached to the discharge fitting on the casing cap. ?he-Controller is then turned on and <br /> adjusted to reach the desired purge rate. <br /> Note: In all cases where gasoline powered generator or compressors are used, .they are to <br /> be placed at least ten feet downwind of the well being sampled. <br /> 5. During purging, field parameters (pH, electrical conductivity, turbidity, and temperature) <br /> will be monitored. Parameter measurements will be recorded on Purge and sample Logs. <br /> In addition field observations also will be ma&and recorded.on the-Purge and-Sample- <br /> Logs. Such observations include low rates.-volumcpurged;.color,odor, bubbling or-aqy-- <br /> other notable observations. An example of a Purge Characterization and Sample Log is <br /> attached. <br /> 6_ g will continue until stable parameter readings are obtained_ pH is considered <br /> stable if the readings do.not vary by greater than 0.1 pH unit. Temperature is considered <br /> stable if it does not vary by more that one degree Celsius. Conductivity andturbidity are <br /> considered stable if they do not vary by greater than IM/_ Field parameters _will be <br /> rePeated at approidfive gallon intervals. A minimum of three well volumes of water <br /> be owed from each well. The final, stable, values will be recorded to be used in <br /> the annu°ai repott. <br /> Sample Collection <br /> Samples will..be collected as soon as possible after purging is completed. Laboratory-supplied <br /> co '' ens will be used to hold the water samples. Samples to be analyzed for volatile-organic <br /> cOnsdUieWs will be collected first Del=ding on.the well, samples will be collected with either <br /> dedicated pumps or disposable balers (a new factory wrapped barer will be used at each well). <br /> In the case of dedicated pumps, the pump rate will be adjusted so that the sample will not be <br /> agitated as it is collected in sample bottles. When bailers arc used, they will be lowered slowly <br /> into the well so not to disturb the water. The sample will be decanted into the bottles slowly with <br /> i <br /> 23-4$3849-F411231 ORW A4 July 14,2000 <br /> 0 ridawda.IM <br />