1. Water Temperature. The ten5>erature of the vater In the 

 turning basin at the tl3te of Installation vas 72° F, "but It was given 

 as 80° F on June 15, 19^^. Further data on the water temperatures are 

 tabulated belqw. It Is apparent from a study of the table that the 

 ten^erature of the water within the turning basin varies within con- 

 siderable limits In different months of the year, emd also during the 

 same season In different years. During the approximately 5|-yeew 

 period of the test, the greatest range of water teiQ)erature was from 

 50° F In January to 86° F In September, October, and November of 1945. 



The following record of ten^jerature of the water In degrees F, 

 based on readings taken at various times each month, shows the general 

 rai]ge at this location. 



Month 19>»'» 19^^^ 19^6 19^»7 1948 



January 50 75 63.9 6k 



February 55 75 50.9 Sk.k 



March 65 68 58.4 



April 70 68 72.0 



May 75 68 74.7 



June 72-80 84 — 77-0 



July — 84 80.6 79.9 



August — 84 80.4 



September — 86 77.8 — 



October — 86 73.1 76 



November — 86 63.9 68 



December 53 75 65.5 



2. Salinity . The salinity of the water In the turning basin 

 varies considerably, ranging from 15 to 32 parts of dissolved salts per 

 thousand. The maximum range Is slightly lower than the reading taken 

 from the surf, which. In June 1944, was 34 to 35 parts per thousand. The 

 salinity of the water Is affected by the tides and winds, as certain 

 combinations of these elements will force considerable river water Into 

 the basin. 



3. Pollution . The water at this location appears to be 

 reasonably free from pollution, but an analysis shows Bacillus coll 

 present. The two samples tested In June 1944 showed 4,800 and 3,400 

 colonl»a per cc, respectively. 



A17.03 Marine Borers 



1. Teredlnidae . Teredinldae , Including Bankia gouldl and 

 Teredo sp., were very active throughout the period covered by the teat. 

 The attack at this location was so severe that it was found i]q>os8lble 

 to maintain for the usual 8-month period the 12-ln. i 6-ln. x 1-in. 

 panels used in the test. In August 1944, it was requested that the 

 original panels be removed and replaced with new ones, 2 inches thick. 



80 



