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conductive water. Cable markings are stamped at 1 -foot increments to facilitate depth control. Depth to water measurements are recorded to the nearest 0.01 foot. Well total depth is measured by lowering the probe to the bottom of the well. Well total depths are recorded to the nearest 0.5 foot. Before and after each use, the sounder will be decontaminated by steam cleaning. Well Samolin Pg umos The water coaxial cable connects the control panel to the sensor. level is measured by lowering the sensor into the well. A low -current cross -contamination. The type of pumps installed will be determined circuit is completed when the sensor makes contact with the water, gained from Monitoring Well MW -1, a low yield formation is anticipat- which serves as an electrolyte. The current is amplified and fed into an indicator light and audible buzzer, thus signaling when water has been contacted. A sensitivity control compensates for very saline or conductive water. Cable markings are stamped at 1 -foot increments to facilitate depth control. Depth to water measurements are recorded to the nearest 0.01 foot. Well total depth is measured by lowering the probe to the bottom of the well. Well total depths are recorded to the nearest 0.5 foot. Before and after each use, the sounder will be decontaminated by steam cleaning. Well Samolin Pg umos EMCON recommends that dedicated pumps be installed in all wells following well construction completion. The benefits associated with permanently installing these pumps are reduced field time for well purging and equipment cleaning, and eliminating the potential for cross -contamination. The type of pumps installed will be determined based on pumping characteristics of the wells. Based on experience gained from Monitoring Well MW -1, a low yield formation is anticipat- ed. If this is consistent in the new wells, it is likely that EMCON would recommend positive displacement bladder pumps. ell Purging be Before sampling, standing water in the casing and sand pack will purged from the well. The amount of water purged will be greater than or equal to four casing volumes so that water representative of the in situ ground water is obtained. Some wells may be pumped dry before the removal of four casing volumes. If this occurs, the wells are allowed to recharge up to 24 hours. For parameters sensitive to volatilization, samples will be collected as soon as the wells have recharged to a level sufficient for sample collection. For the B-3