Section 52 

 DUTCH HAEBOR, ALASKA. -- U. S. HAYAL OPERATING BASE 



A32.OI Location of Test Station and Test Board 



A test toari of the panel type, designated loj the symbol USHDH-1, 

 was operated at the U. S. Naval Operating Base at Dutch Hartor In a hay on 

 the north side of Unalaska Island, AlasJca, fl:6m Jiily 1, 1914-4 to August 1, 

 I947, after which no further panels were received. It was later learned 

 that this Base was decomnlssloned on November 1, 194>, and that no qualified 

 personnel were avallahle at Dutch Harhor to continue the operation of this 

 test "board after that date. No Information waB given as to the exact loca- 

 tion of this test hoard. 



A32.O2 Hydrographlc Data 



The depth of water where the test hoard was installed was 25 ft, 

 the tidal range 3.6 ft, the current zero. The temperature of the water at 

 the time of installation was 46° F. The pollution was negligible. 



A32.O3 Marine Borers 



1. Teredlnldae . Teredlnidae occurred to a very limited eaitent at 

 this location in I945 and 1946, and none was recorded in either the control 

 or test panels in 1944 or 194?. In the control panels, only 5 emhryonic 

 and 8 Juvenile specimens were recorded on 2 panels suhmerged from March 1 

 to May 1, 1946. In the test panels, Teredlnldae occurred in U of the 57) 

 hut they occurred only during the months from March through July In 1945 and 

 1946, which Indicates the breeding season at this location. Thexnaximum 

 length attained was 54 mm on a panel submerged for 8 months, ststrtlng on 

 July 1, 1945. The largest number of specimens recorded on any one panel was 

 20 borers. BanJda setae ea was the only form identified. The attack rated 

 slight in 1945 and 1946 and none In 1947. 



2. L^mnorla . Llmnorla showed slight evidence of activity through- 

 out the test, first appearing in the panel removed on December 1, 1944, after 

 a submergence. of 5 months. In the control panels, only 2 tunnels were 

 recorded in one panel submerged during March 1947. In the test panels, 

 Llmnorla occurred on 24 of the 37 but were absent on the first 4 panels. 



The maximum number on aijy of these panels was 35, so that the attack rated 

 only a mere trace each year. 



A32.04 Fouling Agents 



1. Silt . Silt occurred on all the panels of both the control and 

 test series, except the first panel of each. The deposits on the panels of 



140 



