ARCHIVED REPORTS_2006_3 - Laserfiche WebLink

Home Browse Search

e In the case of the non-dedicated pump, it is lowered into the well and then activates ; (power from the controller box is regulated which controls the discharge rate of the centrifugal purge pump), In the case of a well with a dedicated' pump, the pneumatic controller box is connected to the dedicated pump (some wells have special high-rate purge pumps used only for purging, these ca a* 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 fivittg on the casing cap. The-Controller is then iaurned on 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 being sampled. 5. During purging, field parameters (pH, electrical conductivity, turbidity, and temperature) will be monitored. Parameter measurements will be recorded on Purge and Sample Logs. In addition field observations also will be made.and r=. riled.on the Paige and-Sample- Logs. Such observations include-flow rates,-volume-purged'-color,odor,bubbling or-any•- other notable observations. An example of a Purge CharacteriZatiant and Sample Log is attached_ 6_ Purging will.-continue until stable parameter readings are obtained. pH is considered stable if the readings do.not vary by greater than 0.1 pH unit, Temperatureis ccs dered 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%_ Field parameters.will be repeated at approximate five gallon intervals. A minimum of three well volumes of water vrffl be rcmoved from each well. The final, stable,values will be recorded to be used in the annual repoit Sample Collection Samples will be collected as soon as possible after purging is completed. Laboratory-supplied contilners WM be used to hold the. water samples. Samples to be analyzed for volatile-organic COnstiUients will be collected first Dq=4tmg on.the well, samples will be collected with either dedicated pumps or disposable bailers (anew factory wrapped bailer will be used at each well). In. thecase of dedicated pumps, the pump rate will be adjusted so that the sample will not be as it is collected in sample bottles. When bailers are used., they will be lowered slowly into the well so not to disturb the water. The sample will be decanted into the bottles slowly with 23-M349-FOR23 A4 July 14,2000 C4pyrf&M rjdaeddcr.toc.