line 8 in. in diameter from sludge beds of Imhoff tanks; and a llf-in, "by- 

 pass dl'scharging raw sewage, which is iised only in case of emergency, aa 

 normally all sewage passes through Imhoff tanks for treatment. 



2. Test Board Ho. 2 (lJSMPH-2) . ^le depth of water where this 

 tee-^ board was installed was 2^.5 ft at mean low tide; the tidal range 

 ■varied from about 2,7 to 8.1 ft; the current velocity was said to be 

 zero. The temperature of the water at the time of installation was 59° F. 

 The data in regard to aalinit" and pollution for this test board are the 

 same as those for Test Board No. 1. Both test boards are suspended 8 ft 

 above the mud line, with the bottom approximately 2 ft from that line . 



The following record of the temperature of the water in degrees F, 

 based on readings made mostly around the middle of each month and 5 ft 

 above the mud line, shows the general range at each location. 



Temperatures of the water at both locations were recorded both 

 at the surface and at 5 ft above the miid line. As a rule, the temperature 

 at the surface was only one or two degrees higher than that taken 5 ft 

 above the mud line, which indicated that there was. little vertlca:l varia- 

 tion. 



At5.03 Marine Borers 



1. Teredlnidae. Teredinldae, including Barikia setacea. Teredo 



19!^ 



