sewage pollution exists. The water iisre is practically stagnant. 



5. USHH-3 (DE Wharf ). The depth of water where this test 

 "board was installed was 25.5 ft- ^© ticLal range and teiaperature of 

 the water are the same as given for the first test "board. Pollution 

 and current are negligible. 



k. U5M-4 (Fuel Oil Pier ). The depth of water where this 

 test hoard was installed was 28.6 ft The tidal range and tenrperature 

 of the water were the same as given for the first, test hoard. There 

 is a considerahle amount of fuel oil on the surface of, the water in 

 this area, and pollution from sewage is also appreciable. There is more 

 current at this site than at the other test hoards, hut it was estimated 

 to have a TtK.ylTTium velocity of only 0.2 knot. 



Fu2rther data on the temperature and salinity of the water at 

 the different locations are given in the following tahles. 



22ll. 



