ARCHIVED REPORTS_2007_5 - Laserfiche WebLink

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In the case of the -non-dedicatedepump, it is lowered into the welt and then actio {power from the controller box is re ated w i ate Each controls the discharge rate of the . } centrifugal purge pump). In the case of a well witii a dedicatedurn P ump' the pneumatic controller box is connected to the dedicated P F (soma wells have special high-rate Purge pumps used only for purging,these can be identified by the fittintgs on the cap). A dedicated a tube (kept locked at the well head is a protective bag) is then attached to the discharge fitting on the casing cap. The-Controller is then turned an and adjusted to reach the desired purge rate. Note: In all cases where gasoline powered generator or compressors.are used,they are to be placed at least ten feet downwind of the well bemg sampled S. During purging,field parameters(pH, electrical conductivity,turbidi tY, and temperature) will be monitored. Parameter measurements will be recorded on Putge and Sample Logs. In addition field observations also will be ma&and recorded on the Purge and Sample Logs. Such observationsinclude-flow rates;.-voiume-p color,odor,bubbling or-any ®then notable observations. An example of a Purge Characterization and Sample Lag is attached. 6. g will:cozitinue until stable parameter readings are obtamecL pH is considered - stable if the readings do.not vary by greater than 0.1 pH unit. Temperature its considered stable if it does not vary by more that one degree Celsius. Conductivity and turbidity are considered stable if they do not vary by greater than 10'/a Field parameters.will be repeated at apprbXhMtc five gallon intu-vals. A minimum of three well volumes of water v ll be removed from each well. The final,stab$r_, values will be recorded to be used in the annual repott. Sarnple Coliection SaMPles will.be collected as soon as possible after Purging is Ozimpleted. Laboratory-supplied cOnW11= 'gill be used to hold the.water samples. Samples to be aaalyzed for volatfie organic tOnstiticUts Will be collected first. ding on.the well, samples will be collected witb either dtdimted Pumps or disposable bailers(a-new factory 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 Agitated as it is collected in sample hollies. When bailers arc used, they Will be Iowcrcd slowly into the well so not to disturb the water. The sample will be decanted into the bottles slowly with23-W , 849-FO IW I Op tM A4 July l4,X000 i 2440 KkhiM4 ,too