Map showing areas of the Gulf of the Farallones 

 where levels of sea-floor radioactivity were measured 

 using the British Geological Survey EEL. Also shown is 

 the approximate extent of the Farallon Islands Radio- 

 active Waste Dump. This area was where approx- 

 imately 47,800 large containers, mostly 55-gallon 

 drums, of low-level radioactive waste were dumped 

 between 1946 and 1970. The containers were to be 

 dumped at three designated sites (informally referred 

 to as the 90-meter, 900-meter, and 1 ,800-meter sites), 

 but they actually litter an area of sea floor of at least 

 540 square miles in water depths ranging from about 

 300 feet to more than 6,000 feet. 



12330' 



123 D 00' 

 I 



I 



20 MILES 



I 



20 KILOMETERS 



Gulf of Farallones 

 National Marine Sanctuary 



3730' 



San 

 Francisco 



PIONEER 



SI-:AMOUNT 



3700' 



3B45' 



GUIDE 



SEAMOl'NT 



EXPLANATION 



Gulf of the Farallones National 

 Marine Sanctuary 



Farallon Islands Radioactive Waste 

 Dump(FIRWD) 



Previously designated sites for 

 dumping of radioactive waste 



Area around 90-m site 

 Area around 900-m site 



Area around known cluster of 

 radioactive-waste containers 



Area around 1,800-m site 



70 Issues of Environmental Management in the Gulf of the Farallones 



