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Groundwater Sampling and Analysis Plan <br /> Sprayfield Groundwater Monitoring <br /> Decontamination <br /> • Any company owned or rented equipment used for the sampling of ground water (i.e. pumps, <br /> measurement devices, etc.) will be cleaned prior to use. Cleaning will be accomplished by <br /> washing the equipment in a solution of warm water and trisodium phosphate(TSP) followed by <br /> two successive rinses with deionized (DI) water. The decontamination will occur in the field <br /> during and at the completion of each workday. Decontamination fluid will be discharged to <br /> ground with well purge water. <br /> • Purge pumps will be decontaminated between wells by circulating a solution of water and <br /> TSP through the pump, while scrubbing the outside of the pump with a brush. Purge pumps <br /> will be rinsed after decon with DI water. <br />