To obtain an accurate sample using a bailer, just follow these basic instructions:
1) Gently lower the bailer down the groundwater well column. Do not let the bailer crash into the water table. This will cause agitation and turbidity through surging and the sudden impact of the sampling device.
2) As the bailer approaches the water level within the well, be sure to ease the bailer into the water table for the first 3-6 inches of the bailer length. The recommended rate of descent for this step is five to 10 seconds.
3) Once the bailer has been gently lowered into the water table, allow the bailer to descend on its own until it fills. Do not allow the bailer to descend to the very bottom of the well. If the bailer comes in contact with the bottom, it could disturb the sediment that may be settled at the bottom of the well. This will also cause turbidity within the well and your sample.
4) Once the bailer fills, retrieve the bailer from the well slowly, in a steady, smooth motion. It is neither necessary nor recommended to jerk or jig the bailer line.
By simply following these basic steps, you will retrieve accurate groundwater
samples in a cost-effective and timely manner. This extra care during groundwater
sampling when using a bailer adds only one to two minutes of additional
time to complete the task. By utilizing these methods, sampling with bailers
will significantly reduce agitation and turbidity and provide you with a
simple, accurate and cost-effective means for obtaining groundwater samples.
The Clear View Bailer is a clear medical grade PVC disposable bailer that
has proven itself as a superior product and is now used world wide.