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F:\projcct\2Ca-475\cxwk P1 <br /> accurate and can be- validated. The OA/AC program will address equipment <br /> decontamination and calibration procedures and sample validation. <br /> Equipment Decontamination- Before the start of drilling activities, ESE or the driller will <br /> decontaminate the equipment that will be inserted in the well bore or the well casing. The <br /> driller will decontaminate drilling equipment, such as auger flights and tools, by steam <br /> cleaning before starting field work. During drilling, the driller or ESE field geologist will <br /> decontaminate the standard penetration sampler and brass liners by washing in a tri-sodium <br /> phosphate(TSP)solution and triple rinsing,in potable water,methanol and distilled water. <br /> ESE will decontaminate bailers used to sample ground water using the same procedure. <br /> Equipment used for non-intrusive activities, such as water level probes, will be rinsed in <br /> distilled water between readings in wells. Decontamination procedures will be recorded <br /> in a Field Log. <br /> Equipment Calibration-ESE will calibrate equipment to be used for measuring ground- <br /> rl meter and specific conductance meter. Calibration <br /> water quality parameters,such as p <br /> results will be recorded in a Water Sample field log. <br /> Sample Validation-ESE will su'umit one duplicate ground-water sample, one equipment <br /> rinsate sample and a trip blank sample for analysis. The object of the duplicate sample is <br /> to test the replicability of ESE's sampling method and of the analytical laboratory results. <br /> The object of the rinsate sample is to test ESE"s decontamination procedures. The object <br /> of the trip blank sample is to test for the possibility of environmental contamination of the <br /> samples during transport. <br /> ESE will take a duplicate sample from one of the three monitoring wells, at the discretion <br /> of ESE field personnel. ESE will take a rinsate sample from the final distilled water rinse <br /> used for decontaminating the sampling bailer. The trip blank will be prepared and <br /> provided by the analytical laboratory, to accompany the container with all sample bottles <br /> 9 <br />