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In tho case of the non-dedicated pump, it is lowered into the well and then activate <br /> (polder 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 pneuma,6. <br /> controller box is connected to the dedicated pump (some wells have special high-rate <br /> purge pumps used only for p ' g,these can be identified by the fittings*on the cap). A <br /> dedicated discharge tilbe (kept locked at the well head is a protective . is then <br /> attached to the discharge fittuag on the casing cap. The-Controller is then turned on acid <br /> adjusted to reach the desired purge rate. <br /> Note: In all cases where gasoline powered generator or compressors ate used, they are to <br /> be placed at least ten feet downwind of the well being sainpled. <br /> 5. During Purging, field parameters (pH, electrical conductivity, turbidity, and temperature) <br /> will be moxXitored. Parameter measure;nents will be recorded on Purge and Sample.Logs. <br /> In addition field observations also will be ma&and recorded.on then Purge and-Sam <br /> Logs* Such observations include•flow rates;-volume-putgo color,odor,bubbling or any. <br /> other notable observations. An example of a Purge Characterization and Sample Log is <br /> attached. - <br /> 6_ Purging will.contir ue until-stable parameter readings are obtained. pH is considered <br /> stable-if the readings do.not vary by greater than 0-1 PH unii. Temperature is considered <br /> stable if it does not.vary by more that one degree Celsius. Conductivity and turbidity are <br /> considered stable if they do not vary by greater than -I0%_ Field parameters.will be <br /> repeated at approximate five gallon intervals_ A minimum of three well volumes of water <br /> will be removed from each well. The final,stable,values will be recorded to be used in <br /> the annual repott. <br /> Sample Collection <br /> Samples will:be collected as soon as possible after purging is completed. Laboratory-supplied <br /> coniiiners will be used to hold the.water samples. Samples to be analyzed for volatile-organic <br /> consduients will be collected first, ding on.the well, samples will be collected with either <br /> dedicated pumps or disposable bailers (a-new factory wrapped bailer Will be used at each well). <br /> In, the. case of dedicated pumps, the pump rate WE] be adjusted so that the sample will not ba <br /> zVtated as it is collected in sample bottles. When bailers an 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 /> 849-FOM31OR32-5 A4 July 14,2040 <br /> Z �e t� <br />