2. Sampling Procedure - Field HQ: In addition to the samples just described, field HQ will operate a Cascade Impactor on the ground and in the air. A continuous sample should be collected on the ground be- tween C-l,7 flights. The C-l:7 will be equipped with two Hi Volume samplers and a Scintillometer and the Cascade Impactor can also be operated on board. The aircraft will make two two-hour flights daily, preferably spaced twelve hours apart. The flight pattern will consist of repeated traverses along the line of the three ground stations. ao Traverses should be made alternately at 5,000* and half gts way between 5,000 and ground elevation. A pair of Hi Volume samples should be collected per traverse. A log of Scintillometer readings versus time and aircraft position should be maintained, The Berkley Portable Scaler should be used to gain a quale. itative estimation of activity on the Hi Volume samples © collected at field HQ, both on the ground and in the air. . HQ should be informed of significant changes in activity. — Sampling will continue at all stations until ordered to cease by HQ. Be Communications: Communications between ground stations and between field HQ and HQ will be by telephone. Instructions regarding original deployment will originate from HQ. Further, communications should originate from field HQ. Collect calls should be made to HQ once a day to transmit data and receive instructions. HQ should be informed of the field HQ telephone number as soon as the sampling stations have been established. 7 DON AncmYes R~ meme