Table 3.  National Stream Quality Accounting Network and 
Hydrologic Benchmark Network time periods of sample collection 
for bimonthly and quarterly sampling frequencies  

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Sample Number       Bimonthly frequency     Quarterly frequency
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     1               October-November        October-December
     2               December-January        January-March
     3               February-March          April-June
     4               April-May               July-September
     5               June-July        
     6               August-September        
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