ARCHIVED REPORTS_2009_12 - Laserfiche WebLink

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In the case of the nondedicated pump, it is lowered into the well and then activate (polder from i 'the controller box s regulated which controls the discharge rate of the h. centrifugal purge pump). In the case of a well with a dedicated'pump, the pneumatic controller box is connected to the dedimted pump (some wells have special high-rate Purge pumps used only for puigiiig, these can be identified by the fittings on the cap). A dedicated.discharge tube (kept locked at the well head in a protective •bag) is then attached to the discharge fitting on the casing cap. The-Controller is then turned on and adjusted to reach the desired purge rate. Note: In all cases where gasoline powered generator or i:ompressors are used, they are to be placed at Ieast ten feet downwind of the well being sampled. S• During purging, field parameters (pH, electrical conductivity, turbidity, and temperature) v'U be monitored. Parameter measurements will be ra:orded on Purge and Sample Logs_ In addition field observations also will be ma&and m-corded. On the Purge and Sample- Logs. Such observations include•flow rates;-vatume•purgcd;,color,odor,bubbling or-a4y-- other notable observations. An example of a Purge Charactezi on and Sample Log is attached. Purging will:continue until stable parameter readings are Obtained.. pH is considered - stable if the readings donut wary by greater than 0.1 pH unit ?Temperature is considered stable if it does not vary by mom that one degree Celsius. Conductivity and turbidity are considered stable if they do not vary by greater than M/a. Field parameters.will be repeated at approximate five gallon intex-a . A minimum of three well volumes of water - WM be removed from each well. The final,stable,valueswill be recorded to be used in the annual rccpott. . Samlile Collection = Samples will be collected as soon as possible after purging is complcted. Laboratory -supplicd contUnars will be used to hold the.water samples. Samples to be atialyied for volatile-organic constittic=will be collected first, Depending on.the well, samples Will be collet-ted-with either dedicated pumps or disposable hers (a new factory wrapped bailer will beused at each well). la the. case of dedicated pumps, the pump rate will be adjusted so that the sample will not be agitated as it is collected In sample bottles. When bailers arc used, they will be Iow+ered slowly into the wi:I1 so not to disturb the water. The sample will be decanted into the bottles slowly with - 23-433$44-FOIW I ORM A-8 July 14.20M 2"rJeb al lac.