“oe I. Precipitation Samples A. Collections The sampling trays furnish y NYO have an area of 9 square feet and are mounted on legs for ease in setting up. The tray should be erected and a two-quart Mason jar placed under the outlet. In case of heavy rain, the jar should be replaced when full, and all jars treated as one sample. Light snowfalls may be transferred to the jar with the rubber squeegee furnished, After allowing it to melt, it is treated the same way as collected rain. It is not possible to furnish large containers, so for heavier snowfalls, two jars my be filled with snow froma smaller area than the whole tray, and the area cleared noted on the data sheet. ~"7'-s+S5eamne The filtration kit furnished by NYO contains a filter ~ ‘-= eenirator to supply suction and two “== =f Pancets, The f oF RADIOACTIVE or FALL-ouT STUDIES Suppsrt the drain + ing ofet require @ tray, UGsisu Wee tray has dried out after a rai, that period is collected. This is done by wetting uv. -_ with water and washing the dust into the Mason jar with the rubber squeegee furnished and more water. This may be readily accomplished with less than two quarts of wter, (If it has rained, the tray washings are filtered with the collected rain as one sample). Filtration: This is done exactly as for precipitation samples.