ARCHIVED REPORTS_2008_14 - Laserfiche WebLink

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In the case of the nondedicated pump, it is lowered into the well and then activate (power from 'the controller box is regWated which controls the discharge rate of the centrifugal purge pump). In the case of a Weil with a dedicatedurn th P P: e Pneumatic controller box is commected to the dedicated pump (some welts have special hi - gh-rate - purge pumps used only for purging, a be identified by the fittings on the cap). A dedicated a tube (kept locked at the Well head in a pwteatgve -bag) is then attached to the discharge fitting on the casing cap. The.Controller is then fumed oa and adjusted to reach the desired purge rate. Note: In all cases where gasoline powered generator or compressors are used, they axe to be placed at least ten feet downwind of the well being sampled. 5. During purging,field parameters (pH, electrical conductivity, turbidity, and ternperawm) will be monitored_ Parameter measurements will be recorded on Purge and Sample Logs. In addition field observations also vill be ma&and recorded.on the Purge and-Sample,- Logs. Such observations include-flow rat ;-volume-purge color,odor, bubbling or- any--other notable observations. An example of a Purge Characterization and Sample Log is attached. 6- Purging, will:continuc until stable parameter readings are obtained.. pH is considered stable if the readings do.not vary by gmter than 4.1 pH unit Temperature is considered stable if it does not vary by more#bat one degree Celsius. Conductivity and turbidity are considered stable if they do not vary by greater than •104/4- Field parametms.will be repeated at approximate five gallon in . A minimum of thu wen volumes of water will be removed from each well. The final,stablc,values will be recorded to be used in the annual report. sample CollectionSaMP " les will:be collected as soon as possible after purging is completed. Laboratory-supplied cOntiinas will be used to hold the.Prater samples_ Samples to be analyzed for volatile-organic consdtli=ts will be collected fust Deperiding on.the well, samples will be coli with either dedicated pumps or disposable bailers (a new fiztory Wrgind bailer will be used at each well). In the, case of dedicated pumps, the pump rate will be adjusted so that the sample will not be 4tated as it is collected in sample bottles. en ballers arc used, they will be lowered slowly into the well so not to disturb the water. The sample will be decantedinto the bottles slowly with - 84499-�Foi123 i oRm A-8 July I4.2000