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1 <br /> use The bailer will be lowered to a point just below the liquid level, <br />' retrieved, and observed for floating hydrocarbon <br /> Liquid measurements will be recorded to the nearest 0 01 foot in the field <br />' logbook The ground-water elevation at each monitoring well will be cal- <br /> culated by subtracting the measured depth to water from the surveyed <br /> elevation of the top of the well casing (Every attempt will be made to mea- <br /> sure depth to water for all wells on the same day ) Total well depth will <br /> then be measured by lowering the sensor to the bottom of the well Total <br /> well depth, used to calculate purge volumes and to determine whether the <br /> well screen is partially obstructed by silt, will be recorded to the nearest <br /> 0 1 foot in the field logbook <br /> Well Purging <br /> Before the sampling event, a polyvinyl chloride bailer, low-flow sub- <br /> mersible pump, or Teflon bailer will be used to purge standing water in the <br /> casing and gravel pack from the monitoring well Monitoring wells will be <br />' purged according to the protocol presented in Figure B-1 In most moni- <br /> tonng wells, the amount of water purged before sampling will be greater <br /> than or equal to three casing volumes Some monitoring wells are <br /> expected to be evacuated to dryness after removing fewer than three cas- <br /> ing volumes These low-yield monitonng wells will be allowed to recharge <br /> for up to 24 hours Samples will be obtained as soon as the monitoring <br /> wells have recharged to a level sufficient for sample collection If insuffi- <br /> cient water has recharged after 24 hours, the monitoring well-will be <br />' recorded as dry for the sampling event <br /> Ground water purged from the monitoring wells will be containerized to <br /> 55-gallon drums for subsequent disposal Drums will be stored on site at a <br />' Shell-designated location <br /> EMICON will arranyv fo; the u�sp:.--:A! f '.9 purgad "'4tor and the <br /> removal of drums through Crosby and Overton During storage, drums will <br /> be properly labeled with a Shell drum label <br />' Field measurements of pH, specific conductance, temperature, turbidity <br /> and dissolved oxygen (when requested) will be recorded in a waterproof <br /> field logbook Figure B-2 shows an example of the Water Sample Field <br />' Data Sheet on which Bald data are recorded Feld data sheets will be <br /> reviewed for completeness by the sampling coordinator after the sampling <br /> event is completed <br />' PRA P91 K022 AOW Rev 0 February 7, 1992 <br />