Additionally, single, large-scale grids based upon 100-foot and 200-foot centers were surveyed, staked, and sampled in Areas 1 and 4. Deep profile sampling to a depth of 120 cm was required in the areas also due to a large amount of mechanical disturbance over the years. The HAMILTON event in Area 5 was extensively sampled using both grid and random sampling techniques to permit evaluation of the relative merits of both This evaluation is still under review by the PIDP. systems. Field tests were conducted to evaluate the possible usefulness of two new An improved FIDLER system portable instrument systems in the PIDP program. designed by Eberline Instrument Corporation and an LLL 256-channel portable analyzer developed as part of the VEST program was tested in Area 5, SMALL BOY. PIDP soil sample results for SMALL BOY and HAMILTON in Area 5 were plotted and preliminary isopleths have been generated. The REECo technical support staff assigned to assist in NAEG programs increased during 1975 to four with the addition of two staff positions. FUTURE PLANS Anticipated REECo support activities through September, 1976, include the following: Combining NAEG field trips expected to the Tonopah Test Range (TTR) NAEG intensive study areas and Nevada Test Site (NTS) NAEG study areas, the projected total is 15. Additional field trips are expected for the purpose of topographic and radiation surveys of nuclear detonation sites to select future NAEG nuclear study sites. Also, several aerial surveys are expected for the Same purpose. REECo NTS support of NAEG activities is planned to include: a. The collection, preparation, and shipment for analysis of approximately 250 soil samples for the ongoing NAEG Soils Element Soil Mound Study No. 23 b. The collection, preparation, and shipment for analysis of approximately 150 vegetation samples for the ongoing NAEG Vegetation Element Soil Mound Study No. 2; c. The collection, preparation, and shipment for analysis of approximately 170 soils and 170 vegetation samples to supplement present plutonium concentration contour data; 294