Section 2k 

 SAN JUAN, PUERTO RICO — U. S. MVAL AIR STATION 



A2i|-.01 Location of the Test Station and Test Board, 



A test "board of the panel type was installed Septeinber 21, 19^*)-, 

 at the U. S. Naval Air Station at San Juan, Puerto Rico. This "board was 

 located "between the center supporting piles of a temporary wharf at the 

 San Antonio Tarit Faorm, located on the south side of the San Antonio Channel 

 in San Juan Hartor, which is on the northern coast of the Island. The 

 wharf was a small structure "built of untreated piles, which on August 25, 

 19^5 > was said to "be i»- or 5 years old and in ruins. 



On March 26, 19^1-7, the Naval Air Station advised that the small 

 wharf at the gasoline tank farm, under which the test "board had "been 

 suspended, had ceased to "be serviceahle and had "been removed a'bout January 

 21, 19^7^ when the test "board was relocated under the Tender Pier, on 

 San Juan Bay proper, a'bout 12 ft from the nearest wood pile. Sewage, water 

 salinity, and temperature conditions at "both locations are considered to "be 

 a"bout the same. 



The test "board was designated "by the symhol DSNSJ-1. Its operation 

 is "being continued, and the results have "been siumnarized to the end of 

 19^7. 



A2i»-.02 Hydrographlc Ib.ta 



The deptfe of water where the test "board was Installed was l6 ft 

 at low tide; the tidal range was given as 1.2 ftj there was no appreciaMe 

 current. The tempera tiire of the water at the time of Installation was 

 80° F. The temperature of the sea water in Puerto Rico is two to three 

 degrees lower than the temperature of the air, which is roughly "between 

 75° F and 90° F. The temperature of the water is around 80° F most of the 

 time. The seilinlty of the water at the point where the "board is located is 

 said to "be the same as that of normal sea water, and there is no reason 

 to "believe that it will vary at this location more than in the open ocean; 

 the specific gravity was 1.02if- on March 25, 19i»-6. The degree of pollution 

 (sewage and oil) was reported to "be moderate. However, there is a constant 

 flow of fresh sea water throvigh the east end of the ch ann el, caused "by 

 the waves of the Atlemtic Ocean pounding over a reef at the Atlantic 

 entrance to it. 



A24.05 Marine Borers 



1. Teredinldae . Teredinidag , including Bankia sp.. Teredo navalis , 

 T. parks 1 , T. ( Lvrodus) sp., and T. sp. were very active through the 

 period of the test. The attack was so destructive that in November of 19^5 

 it was requested that the panels "be removed and a new series installed which 



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