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s <br /> w- A record of the purging methods and volumes of water purged will <br /> be maintained. All purge water will be contained onsite in pro- <br /> perly labeled 55-gallon drums, Purged water will be disposed of <br /> at an appropriate facility after the laboratory analytical <br /> results are received. Purged well water that contains no detect- <br /> able levels of hydrocarbons will be disposed of on the site. <br /> 4.5 WELL SURVEY <br /> The elevation of the top of each well casing will be surveyed and <br /> referenced to mean sea level, using a transit and stadia rod, <br /> shooting off a selected benchmark. A small notch will be cut< in <br /> the top of the well casing to -mark the survey point, -t* ;;ensura; <br /> that-this -point is used, for a,ll future water level, mc-asurementw. <br /> 4.6 GROUNDWATER SAMPLING <br /> The new well and nearby domestic wells will be sampled after <br /> well development. Any other monitoring well that contains water <br /> r <br /> will be sampled at the same time. <br /> 4 .6. 1 Sampling Equipment Preparation <br /> All well measurement and sampling equipment will be constructed <br /> of inert material whenever possible. Sampling bailers will be <br /> constructed of Teflon. Stainless steel pumps or PVC bailers will <br /> be used to purge the well prior to sampling. All sampling equip- <br /> ment will be sufficiently decontaminated in the following manner <br /> prior to introduction into each well: <br /> 1s 1 . Bailers, pumps, suspension ropes and lines, and well <br /> sounding tapes will be rinsed thoroughly with clean, <br /> fresh water to remove dust and dirt_ <br /> 2. All equipment will be cleaned inside anO out with Alconox <br /> 6. <br /> , detergent, The equipment may be cle�_„ed offsite and <br /> c51 /97780/5-90/tx 9 <br />