SYMBOLS: 



■ Computer storage and 



C - continuous; D - daily; M - monthly; BM - bimonthly; MC - monthly composite; 

 A - annually at high flow; SA - semi-annually at low and high flow; GF - graphite furnace 



retrieval system - USGS AA - atomic absorption; tot - total; rec - recoverable; diss - dissolved; 



AE - atomic absorption; DC - direct current; ICP - inductively coupled plasma; 



A2-33 



