Proactive 12 volt submersible groundwater pumps fit down 2 inch wells and take the hassle out of well sampling. Attach 3/8" ID or 1/2" ID tubing and plug into your vehicle 12-volt socket or directly to the battery and these pumps will bring the water up.
There are models to cover depths from less than 30 feet to over 200 feet. If you require low flow purging and sampling there are low flow controllers available for many of the models. If you are tired of dragging around a generator and heavy converter box for all of your pumping jobs, you might want to look into getting a few Proactive well pumps to keep on hand. Affordable enough to keep one on each truck as a backup so your field techs don't have to come back empty handed.