PREFACE 



This publication is a result of the research program of the Institute of 

 Natural and Environmental Resources. The Institute is a multi-disciplinary 

 group of scientists involved in a coordinated program of research, teaching 

 and extension. The research effort encompasses investigations of: problems 

 affecting the quality of the environment, economics of agriculture, forest and 

 wildlife resources, the efficient use and conservation of water and soil, and 

 regional and community planning and development. 



The author wishes to express his appreciation to the sewage plant operators, 

 who so willingly cooperated with this project, and to Mr. Douglas Lash for his 

 assistance in sludge sampling and analysis. 



Programs of the New Hampshire Agricultural Experiment Station are open 

 to all persons without regard to race, color, national origin or sex. The 

 University of New Hampshire is an Affirmative Action/Equal Opportunity 

 Emvlover. 



