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use The bailer will be lowered to a point fust below the liquid level, I retrieved, and observed for floating hydrocarbon Liquid measurements will be recorded to the nearest 0 01 foot in the field logbook The ground-water elevation at each monitoring well will be cal- culated by subtracting the measured depth to water from the surveyed elevation of the top of the well casing (Every attempt will be made to mea- sure depth to water for all wells on the same day ) Total well depth will then be measured by lowering the sensor to the bottom of the well Total well depth, used to calculate purge volumes and to determine whether the I well screen is partially obstructed by silt, will be recorded to the nearest 0 1 foot in the field logbook IWell Purging Before the sampling event, a polyvinyl chlonde bailer, low-flow sub- mersible pump, or Teflon bailer will be used to purge standing water in the casing and gravel pack from the monitoring well Monitoring wells will be purged according to the protocol presented in Figure B-1 In most moni- Itonng wells, the amount of water purged before sampling will be greater than or equal to three casing volumes Some monitonng wells are expected to be evacuated to dryness after removing fewer than three cas- ing volumes These low-yield monitoring wells will be allowed to recharge for up to 24 hours Samples will be obtained as soon as the monitonng wells have recharged to a level sufficient for sample collection If insuffi- cient water has recharged after 24 hours, the monitoring weil-will be recorded as dry for the sampling event IGround water purged from the monitoring wells will be containerized in 55-gallon drums for subsequent disposal Drums will be stored on site at a IShell-designated location t�. rsvv�ti will c1r ^'^�" fnt one rlinncol of *he purged gro d water aRri +ho removal of drums through Crosby and Overton During storage, drums will be properly labeled with a Shell drum label Field measurements of pH, specific conductance, temperature, turbidity Iand dissolved oxygen (when requested) will be recorded in a waterproof field logbook Figure B-2 shows an example of the Water Sample Field I Data Sheet on which field data are recorded Feld data sheets will be reviewed for completeness by the sampling coordinator after the sampling event is completed 61 I PRA P91 K022 A0W Rev 0 February 7, 1992