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In the case of the nc&Aedicated pump, it is lowered inito the well and then activates - <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 ne <br /> controller box is connected to the dedicated um F lunatic <br /> pump (same welts bane special high-rate <br /> purge pumps used only for purginj,-these can be identified by the fittings on the capj. A <br /> dedicated discharge tube (kept locked at the well head in a pmtective -bag) is then <br /> attached to the discharge filling ger the casing cap. The Controller is then timed on and <br /> adjusted to ream the desired purge rate. <br /> Note: Ea all cases where gasoline powered generator orComgressors are used, they are to <br /> be plaeed at Ieast ten feet downwind of the well being sampled. <br /> S. .During purging,field parameters(pH,electrical conductivity,turbidity, and teruperature) } <br /> will be monitored. Parameter measurements will be recorded on Purge and Sample bogs. { <br /> In addition fold observations also will be made:and remrded on the Purge and Sa!rrtple- <br /> Lags. Such obscrvafions mclude•flow rateswolume-pu ged,:color,odor,Bubb <br /> ling <br /> or- <br /> .W--tither nobble observations An example of a Purge Characterimfion and Sample Log is <br /> attached. <br /> �- Purging.will:continue until stable parameter readings are obtain <br /> ed.. pH is ccznsiden d <br /> stable if the readings do.not vay by greater than 0.1 pH unit TeMPCraturc is considered <br /> stable if it does not vary by more that one degree Celsius. Conductivity and tMbidity are <br /> considered stable if they do not vary by greater than "IU%. Field parameters_will be <br /> .repeated at approximate five gallon intervals. A minimum of three well vohrrncs of at, <br /> wit be removed from each welL The final,stable, values will be recorded to be used in <br /> tineannual report, <br /> Satnplc Collection <br /> &Mples will be collected as soon as possible after pur&gis campletcd. Laboratory-sezpplied <br /> caniNnenrs will be used to hold the.water samples. Samples to be analyzed far volatile~organic <br /> COnsdui=ti will be collected first. Ilq=fing on.thc well,samples will bc collected with either <br /> &4cated pumps or disposable bailers(a-now factory wr�bather will be used at each well). <br /> In the case of dedicated pumps, the pump rate will be Ousted so that the sample will not be <br /> agitated as it is collected in sample bottles. When bailers are used, they will be lowered slowly <br /> Tato the well so not to disturb the water: The sample will be decanted into the bottles slowly with <br /> 8441-FOA2310PJZ A4 <br /> July 1 de 2000 <br /> 200 K3 6a,lac, <br />