Tank_valve    MFC_ID    NH4_Trt     
1F            1         enriched    
1G            NA        NA          
2D            1         ambient     
2K            1         enriched    
2L            1         ambient     
4E            1         ambient     
4F            1         enriched    
4K            1         ambient     
4L            1         enriched    
1K            2         ambient     
2E            2         ambient     
2F            2         ambient     
2J            2         enriched    
3D            2         enriched    
3L            2         enriched    
4D            2         enriched    
4J            2         ambient     
1D            3         ambient     
1E            3         ambient     
1J            3         enriched    
1L            3         enriched    
3E            3         enriched    
3F            3         enriched    
3J            3         ambient     
3K            3         ambient