3. Development of procedures for sampling rodent burrows and lizard hibernals, including associated soil, fungi, invertebrates, food caches, and waste products. 4. Continued examination for histopathological effects, particularly the hemopoietic system of small vertebrates with high Pu carcass burdens. Techniques are being developed to examine rodent bone marrow to analyze blood cell formation and chromosome morphology as they relate to Pu body burdens. ACKNOWLEDGMENTS We wish to gratefully acknowledge the cooperation and assistance of the many people who have contributed to this study. Special thanks to Don Wireman, Chuck Rosenberry and Erwin Hensley of REECo for their cooperation. We wish to thank Dick Gilbert at Battelle Northwest for supplying the contour maps of Area 1l. Bill Major of LFE deserves special thanks for his assistance in obtaining radioanalytical data. 214 ne